/**
 * Main CSS for AI Chat Application
 * Modern ChatGPT-like interface with professional design
 */

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-background);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* AI API Loading UI */
.ai-api-loading {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: var(--spacing-1) 0;
  margin: 0;
  /* 🔧 FIX: Remove relative positioning and negative offsets to prevent scroll jitter */
  /* Use simple padding instead of complex positioning for stable layout */
}

.loading-dots {
  display: flex;
  align-items: center;
  gap: 4px;
}

.loading-dot {
  width: 6px;
  height: 6px;
  background-color: var(--color-text-secondary);
  border-radius: 50%;
  animation: loading-dot-bounce 1.4s infinite ease-in-out both;
}

.loading-dot:nth-child(1) {
  animation-delay: -0.32s;
}

.loading-dot:nth-child(2) {
  animation-delay: -0.16s;
}

.loading-dot:nth-child(3) {
  animation-delay: 0s;
}

@keyframes loading-dot-bounce {
  0%, 80%, 100% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  40% {
    transform: scale(1.2);
    opacity: 1;
  }
}

/* Dark theme adjustments for loading dots */
[data-theme="dark"] .loading-dot {
  background-color: var(--color-text-tertiary);
}

/* Loading dots fade in animation */
.ai-api-loading {
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.loading-spinner {
  width: 32px;
  height: 32px;
  position: relative;
  margin-bottom: var(--spacing-4);
}

.loading-spinner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 2px solid transparent;
  border-top: 2px solid var(--color-primary);
  border-radius: 50%;
  animation: apple-spin 1s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
}

.loading-spinner::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: calc(100% - 8px);
  height: calc(100% - 8px);
  border: 1px solid transparent;
  border-bottom: 1px solid var(--color-primary);
  border-radius: 50%;
  animation: apple-spin 1.5s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite reverse;
  opacity: 0.6;
}

/* Apple-style loading animation */
@keyframes apple-spin {
  0% {
    transform: rotate(0deg);
    opacity: 1;
  }
  50% {
    opacity: 0.8;
  }
  100% {
    transform: rotate(360deg);
    opacity: 1;
  }
}

/* Inline loading indicators for AI generation */
.ai-loading-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  background-color: var(--color-surface);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.ai-loading-dots {
  display: flex;
  gap: 2px;
}

.ai-loading-dot {
  width: 4px;
  height: 4px;
  background-color: var(--color-primary);
  border-radius: 50%;
  animation: apple-dots 1.4s ease-in-out infinite both;
}

.ai-loading-dot:nth-child(1) {
  animation-delay: -0.32s;
}

.ai-loading-dot:nth-child(2) {
  animation-delay: -0.16s;
}

.ai-loading-dot:nth-child(3) {
  animation-delay: 0;
}

@keyframes apple-dots {
  0%, 80%, 100% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Subtle pulse loading for message streaming */
.message-streaming {
  position: relative;
}

.message-streaming::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(var(--color-primary-rgb), 0.1) 50%,
    transparent 100%
  );
  animation: message-pulse 2s ease-in-out infinite;
  border-radius: inherit;
  pointer-events: none;
}

@keyframes message-pulse {
  0%, 100% {
    opacity: 0;
    transform: translateX(-100%);
  }
  50% {
    opacity: 1;
    transform: translateX(100%);
  }
}

/* App Container */
.app-container {
  display: flex;
  height: 100vh;
  width: 100%;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  transition: transform var(--transition-normal);
  z-index: var(--z-fixed);
}

/* Floating Action Button */
.new-chat-fab {
  position: absolute;
  bottom: var(--spacing-4);
  right: var(--spacing-4);
  width: 40px;
  height: 40px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-primary);
  border: 1px solid rgba(37, 99, 235, 0.12);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 3px rgba(37, 99, 235, 0.1);
  transition: all var(--transition-normal);
  z-index: var(--z-floating);
  backdrop-filter: blur(12px);
  opacity: 0.85;
}

.new-chat-fab:hover {
  background: rgba(37, 99, 235, 0.12);
  border-color: rgba(37, 99, 235, 0.2);
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.15);
  opacity: 1;
  transform: translateY(-1px);
}

.new-chat-fab:active {
  background: rgba(37, 99, 235, 0.15);
  transform: translateY(0px) scale(0.98);
  transition: all 0.1s ease;
}

.new-chat-fab:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* FAB animation on page load */
.new-chat-fab {
  animation: fab-entrance 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) 0.5s both;
}

@keyframes fab-entrance {
  0% {
    transform: scale(0) rotate(-180deg);
    opacity: 0;
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
}

/* Search Container */
.search-container {
  position: relative;
  padding: var(--spacing-2) var(--spacing-4) var(--spacing-4);
}

.search-input {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-12) var(--spacing-3) var(--spacing-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: var(--font-size-sm);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px var(--color-primary-light), var(--shadow-md);
  background-color: var(--color-background);
  transform: translateY(-1px);
}

.search-input:hover {
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-sm);
}

.search-icon {
  position: absolute;
  right: 22px;
  top: calc(50% - 4px);
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  pointer-events: none;
  transition: color var(--transition-normal);
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  line-height: 1;
}

/* Search Clear Button */
.search-clear-btn {
  position: absolute;
  right: 22px;
  top: calc(50% - 4px);
  transform: translateY(-50%);
  background: none;
  border: none;
  padding: 2px;
  cursor: pointer;
  color: var(--color-text-tertiary);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  z-index: 2;
  line-height: 1;
}

.search-clear-btn:hover {
  color: var(--color-text-secondary);
  background-color: var(--color-surface-hover);
  transform: translateY(-50%) scale(1.1);
}

.search-clear-btn:active {
  transform: translateY(-50%) scale(0.95);
}

/* When search has content, hide search icon and show clear button */
.search-container.has-content .search-icon {
  opacity: 0;
  pointer-events: none;
}

.search-container.has-content .search-clear-btn {
  opacity: 1;
  pointer-events: auto;
}

/* When search is empty, show search icon and hide clear button */
.search-container:not(.has-content) .search-icon {
  opacity: 1;
  pointer-events: none;
}

.search-container:not(.has-content) .search-clear-btn {
  opacity: 0;
  pointer-events: none;
}

/* Conversations List */
.conversations-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-2);
}

.conversation-item {
  padding: var(--spacing-3) var(--spacing-4);
  margin-bottom: var(--spacing-2);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: auto auto auto;
  gap: var(--spacing-1);
  align-items: start;
  position: relative;
  border: 1px solid transparent;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.conversation-item:hover {
  background-color: var(--color-surface-hover);
  border-color: var(--color-border);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.conversation-item:hover .conversation-delete {
  opacity: 1;
}

.conversation-item.active {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, rgba(16, 163, 127, 0.05) 100%);
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateX(6px);
}

.conversation-title {
  grid-column: 1;
  grid-row: 1;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-preview {
  grid-column: 1;
  grid-row: 2;
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  line-height: var(--line-height-tight);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-meta {
  grid-column: 1;
  grid-row: 3;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-1);
}

.conversation-time {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  white-space: nowrap;
}

.conversation-delete {
  opacity: 0;
  transition: opacity var(--transition-fast);
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--spacing-1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
}

.conversation-delete:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-danger);
}

.conversation-actions {
  position: absolute;
  right: var(--spacing-2);
  top: 50%;
  transform: translateY(-50%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.conversation-item:hover .conversation-actions {
  opacity: 1;
}

.conversation-delete-btn {
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--spacing-1);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.conversation-delete-btn:hover {
  color: var(--color-error);
}

/* Sidebar Footer */
.sidebar-footer {
  padding: var(--spacing-4);
  border-top: 1px solid var(--color-border);
}

.settings-btn {
  width: 100%;
  padding: var(--spacing-3) var(--spacing-4);
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-hover) 100%);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  justify-content: center;
}

.settings-btn:hover {
  background: linear-gradient(135deg, var(--color-surface-hover) 0%, var(--color-background) 100%);
  border-color: var(--color-primary);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh; /* Dynamic viewport height for better mobile support */
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
}

/* Chat Header */
.chat-header {
  height: var(--header-height);
  padding: 0 var(--spacing-6);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4);
}

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.sidebar-toggle:hover {
  background-color: var(--color-surface-hover);
}

/* ===== CHAT TITLE STYLES - ENHANCED PROFESSIONAL DESIGN ===== */

.chat-title {
  /* Typography - Ultra Modern and Professional */
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 800;
  font-family: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "Segoe UI", Roboto, "Inter", "Helvetica Neue", Arial, sans-serif;
  letter-spacing: -0.04em;
  line-height: 1.1;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1, "ss01" 1;
  font-variant-numeric: lining-nums;
  
  /* Layout and Positioning */
  margin: 0;
  padding: var(--spacing-3) var(--spacing-5);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  
  /* Enhanced Text Visual Effects - 低调内敛效果 */
  background: linear-gradient(135deg, 
    #374151 0%,     /* 深灰 */
    #4b5563 50%,    /* 中灰 */
    #6b7280 100%    /* 浅灰 */
  );
  background-size: 150% 150%;
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: #374151; /* 深灰后备 */
  
  /* 极简的阴影效果 */
  text-shadow: 
    0 1px 2px rgba(55, 65, 81, 0.1);
  
  /* 去除描边 */
  -webkit-text-stroke: none;
  
  /* Border and Shadow Effects */
  border-radius: var(--radius-xl);
  box-shadow: 
    0 2px 8px rgba(16, 163, 127, 0.1),
    0 1px 3px rgba(16, 163, 127, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  
  /* Transitions and Animations */
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  animation: titleFadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1), 
             gradientShift 30s ease-in-out infinite;
  
  /* Interactive States */
  cursor: default;
  user-select: none;
  
  /* Text Enhancement - 极简效果 */
  filter: drop-shadow(0 1px 1px rgba(55, 65, 81, 0.08));
}

/* Gradient Animation */
@keyframes gradientShift {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* Text Glow Animation for Enhanced Visual Appeal - 专业精致版 */
@keyframes textGlow {
  0% {
    filter: drop-shadow(0 2px 4px rgba(5, 150, 105, 0.3)) 
            drop-shadow(0 4px 8px rgba(29, 78, 216, 0.2))
            brightness(1.1) contrast(1.05);
    -webkit-text-stroke: 0.6px rgba(5, 150, 105, 0.25);
  }
  50% {
    filter: drop-shadow(0 3px 6px rgba(5, 150, 105, 0.4)) 
            drop-shadow(0 6px 12px rgba(29, 78, 216, 0.3))
            drop-shadow(0 9px 18px rgba(124, 58, 237, 0.2))
            drop-shadow(0 12px 24px rgba(190, 24, 93, 0.15))
            brightness(1.2) contrast(1.1);
    -webkit-text-stroke: 0.9px rgba(5, 150, 105, 0.35);
  }
  100% {
    filter: drop-shadow(0 2px 4px rgba(5, 150, 105, 0.3)) 
            drop-shadow(0 4px 8px rgba(29, 78, 216, 0.2))
            brightness(1.1) contrast(1.05);
    -webkit-text-stroke: 0.6px rgba(5, 150, 105, 0.25);
  }
}

/* Enhanced Background Glow Effect */
.chat-title::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(135deg, 
    var(--color-primary) 0%, 
    var(--color-primary-dark, #0d8f6f) 35%,
    var(--color-accent, #7c3aed) 100%);
  background-size: 200% 200%;
  border-radius: var(--radius-xl);
  filter: blur(12px);
  opacity: 0;
  z-index: -1;
  transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  animation: gradientShift 6s ease-in-out infinite;
}

/* Subtle Shimmer Effect */
.chat-title::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.4) 50%, 
    transparent 100%);
  border-radius: var(--radius-xl);
  transition: left 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1;
  pointer-events: none;
}

/* Hover Effects */
.chat-title:hover {
  transform: translateY(-1px) scale(1.02);
  box-shadow: 
    0 4px 16px rgba(16, 163, 127, 0.15),
    0 2px 8px rgba(16, 163, 127, 0.1);
}

.chat-title:hover::before {
  opacity: 0.15;
}

.chat-title:hover::after {
  left: 100%;
}

/* ===== THEME ADAPTATIONS ===== */

/* Light Theme (Default) - Bright and Vibrant Text */
[data-theme="light"] .chat-title {
  background: linear-gradient(135deg, 
    #22c55e 0%, 
    #16a34a 15%,
    #06b6d4 30%,
    #3b82f6 50%,
    #8b5cf6 70%,
    #d946ef 100%);
  background-size: 300% 300%;
  box-shadow: 
    0 2px 8px rgba(34, 197, 94, 0.15),
    0 1px 3px rgba(34, 197, 94, 0.1);
  
  /* Bright and Clear Text Effects for Light Theme */
  text-shadow: 
    0 1px 2px rgba(34, 197, 94, 0.2),
    0 2px 4px rgba(59, 130, 246, 0.15),
    0 4px 8px rgba(139, 92, 246, 0.1);
  -webkit-text-stroke: 0.2px rgba(34, 197, 94, 0.1);
  filter: drop-shadow(0 1px 2px rgba(34, 197, 94, 0.15))
          drop-shadow(0 0 4px rgba(59, 130, 246, 0.1));
}



[data-theme="light"] .chat-title:hover,
[data-theme="light"] #chat-title:hover {
  /* 悬停时的极简效果 */
  text-shadow: 
    0 1px 3px rgba(55, 65, 81, 0.2) !important;
  
  /* 悬停时的极简滤镜效果 */
  filter: 
    drop-shadow(0 1px 2px rgba(55, 65, 81, 0.15))
    brightness(1.03) !important;
  
  /* 去除缩放效果，保持简洁 */
  transform: none !important;
  transition: all 0.3s ease !important;
}

/* Light Theme - 低调内敛文字效果 */
[data-theme="light"] .chat-title,
[data-theme="light"] #chat-title {
  /* 低调的渐变 */
  background: linear-gradient(135deg, 
    #374151 0%,     /* 深灰 */
    #4b5563 50%,    /* 中灰 */
    #6b7280 100%    /* 浅灰 */
  ) !important;
  background-size: 150% 150% !important;
  background-clip: text !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  color: #374151 !important; /* 深灰后备 */
  
  /* 极简的阴影效果 */
  text-shadow: 
    0 1px 2px rgba(55, 65, 81, 0.15) !important;
  
  /* 去除描边 */
  -webkit-text-stroke: none !important;
  
  /* 极简的滤镜效果 */
  filter: 
    drop-shadow(0 1px 1px rgba(55, 65, 81, 0.1))
    brightness(1.02) !important;
  
  /* 极慢的动画 */
  animation: gradientShift 20s ease-in-out infinite !important;
}

/* Dark Theme - 低调内敛文字效果 */
[data-theme="dark"] .chat-title,
[data-theme="dark"] #chat-title {
  /* 低调的渐变 - 暗色主题版本 */
  background: linear-gradient(135deg, 
    #d1d5db 0%,     /* 浅灰 */
    #e5e7eb 50%,    /* 更浅灰 */
    #f3f4f6 100%    /* 最浅灰 */
  ) !important;
  background-size: 150% 150% !important;
  background-clip: text !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  color: #e5e7eb !important; /* 浅色后备 */
  
  /* 极简的阴影效果 - 暗色主题版本 */
  text-shadow: 
    0 1px 2px rgba(209, 213, 219, 0.2) !important;
  
  /* 去除描边 */
  -webkit-text-stroke: none !important;
  
  /* 极简的滤镜效果 - 暗色主题版本 */
  filter: 
    drop-shadow(0 1px 1px rgba(209, 213, 219, 0.15))
    brightness(1.02) !important;
  
  /* 极慢的动画 */
  animation: gradientShift 20s ease-in-out infinite !important;
}



[data-theme="dark"] .chat-title:hover,
[data-theme="dark"] #chat-title:hover {
  /* 悬停时的极简效果 - 暗色主题版本 */
  text-shadow: 
    0 1px 3px rgba(209, 213, 219, 0.25) !important;
  
  /* 悬停时的极简滤镜效果 - 暗色主题版本 */
  filter: 
    drop-shadow(0 1px 2px rgba(209, 213, 219, 0.2))
    brightness(1.03) !important;
  
  /* 去除缩放效果，保持简洁 */
  transform: none !important;
  transition: all 0.3s ease !important;
}

/* High Contrast Theme - Maximum Text Definition */
[data-theme="high-contrast"] .chat-title {
  background: none;
  -webkit-text-fill-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: 900;
  letter-spacing: -0.02em;
  
  /* Ultra-Enhanced Text Effects for High Contrast */
  text-shadow: 
    0 0 2px currentColor,
    0 0 4px currentColor,
    0 0 8px currentColor,
    0 2px 4px rgba(0, 0, 0, 0.8),
    0 4px 8px rgba(0, 0, 0, 0.6);
  -webkit-text-stroke: 1px var(--color-primary);
  
  border: 3px solid var(--color-primary);
  border-radius: var(--radius-xl);
  box-shadow: 
    0 0 0 2px var(--color-background),
    0 0 0 5px var(--color-primary),
    0 4px 12px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  
  /* Enhanced Filter Effects */
  filter: drop-shadow(0 0 4px var(--color-primary))
          drop-shadow(0 2px 8px rgba(0, 0, 0, 0.5))
          contrast(1.2) brightness(1.1);
}

[data-theme="high-contrast"] .chat-title::before {
  display: none;
}

[data-theme="high-contrast"] .chat-title::after {
  background: linear-gradient(90deg, 
    transparent 0%, 
    var(--color-primary) 50%, 
    transparent 100%);
  opacity: 0.4;
  filter: blur(1px);
}

[data-theme="high-contrast"] .chat-title:hover {
  transform: translateY(-2px) scale(1.05);
  
  /* Intensified Hover Effects */
  text-shadow: 
    0 0 4px currentColor,
    0 0 8px currentColor,
    0 0 12px currentColor,
    0 0 16px currentColor,
    0 4px 8px rgba(0, 0, 0, 0.9),
    0 8px 16px rgba(0, 0, 0, 0.7);
  -webkit-text-stroke: 1.5px var(--color-primary);
  
  box-shadow: 
    0 0 0 2px var(--color-background),
    0 0 0 5px var(--color-primary),
    0 8px 24px rgba(0, 0, 0, 0.4),
    0 0 20px var(--color-primary),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  
  filter: drop-shadow(0 0 8px var(--color-primary))
          drop-shadow(0 4px 16px rgba(0, 0, 0, 0.6))
          contrast(1.3) brightness(1.2);
}

/* ===== RESPONSIVE DESIGN ===== */

/* Responsive adjustments for chat title */
@media (max-width: 768px) {
  .chat-title {
    font-size: clamp(1.25rem, 5vw, 1.5rem);
    padding: var(--spacing-1) var(--spacing-3);
    letter-spacing: -0.02em;
    font-weight: 750;
    
    /* Adjusted text effects for smaller screens */
    text-shadow: 
      0 1px 2px rgba(16, 163, 127, 0.2),
      0 2px 4px rgba(16, 163, 127, 0.1);
    -webkit-text-stroke: 0.3px rgba(16, 163, 127, 0.1);
  }
  
  .chat-title:hover {
    transform: translateY(-0.5px) scale(1.01);
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .chat-title {
    font-size: 1.25rem;
    padding: var(--spacing-1) var(--spacing-2);
    letter-spacing: -0.015em;
    font-weight: 700;
    
    /* Simplified effects for mobile performance */
    text-shadow: 
      0 1px 2px rgba(16, 163, 127, 0.15);
    -webkit-text-stroke: 0.2px rgba(16, 163, 127, 0.1);
    filter: drop-shadow(0 1px 2px rgba(16, 163, 127, 0.1));
  }
}

/* Large Screens - Enhanced Beauty */
@media (min-width: 1200px) {
  .chat-title {
    font-size: 2rem;
    padding: var(--spacing-3) var(--spacing-5);
    font-weight: 850;
    letter-spacing: -0.05em;
    
    /* Enhanced effects for large screens */
    text-shadow: 
      0 1px 2px rgba(16, 163, 127, 0.3),
      0 2px 4px rgba(16, 163, 127, 0.2),
      0 4px 8px rgba(16, 163, 127, 0.15),
      0 6px 12px rgba(124, 58, 237, 0.1);
    -webkit-text-stroke: 0.6px rgba(16, 163, 127, 0.15);
    filter: drop-shadow(0 2px 4px rgba(16, 163, 127, 0.25))
            drop-shadow(0 0 8px rgba(124, 58, 237, 0.1));
  }
}

/* ===== ACCESSIBILITY AND MOTION ===== */

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  .chat-title {
    animation: titleFadeInReduced 0.3s ease-out;
    transition: transform 0.2s ease-out;
  }
  
  .chat-title::before,
  .chat-title::after {
    animation: none;
    transition: opacity 0.2s ease-out;
  }
  
  .chat-title:hover {
    transform: none;
  }
}

/* Enhanced Fade In Animation */
@keyframes titleFadeIn {
  0% {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
    filter: blur(4px);
  }
  50% {
    opacity: 0.8;
    transform: translateY(-5px) scale(0.98);
    filter: blur(1px);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

@keyframes titleFadeInReduced {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Focus States for Accessibility */
.chat-title:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
  border-radius: var(--radius-xl);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.stop-btn {
  padding: var(--spacing-2) var(--spacing-4);
  background-color: var(--color-error);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.stop-btn:hover {
  background-color: #dc2626;
}

/* Messages Container */
.messages-container {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.messages-list {
  height: 100%;
  overflow-y: auto;
  padding: var(--spacing-6) var(--spacing-2);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

/* Virtual Scroll Viewport - Essential for message display */
.virtual-scroll-viewport {
  width: 100%;
  height: auto;
  min-height: 0;
  display: flex !important;
  flex-direction: column;
  gap: var(--spacing-6);
  position: relative;
  flex: 1;
  visibility: visible !important;
  opacity: 1 !important;
}

/* Welcome Message */
.welcome-message {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-16) var(--spacing-4);
  max-width: 800px;
  margin: 0 auto;
  animation: welcomeFadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes welcomeFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Welcome Hero Section */
.welcome-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: var(--spacing-12);
}

.welcome-icon-container {
  position: relative;
  margin-bottom: var(--spacing-8);
}

.welcome-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 2;
  animation: iconFloat 3s ease-in-out infinite;
}

.welcome-icon-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, var(--color-primary-light) 0%, transparent 70%);
  border-radius: var(--radius-full);
  opacity: 0.3;
  animation: glowPulse 2s ease-in-out infinite alternate;
}

@keyframes iconFloat {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-8px);
  }
}

@keyframes glowPulse {
  from {
    opacity: 0.2;
    transform: translate(-50%, -50%) scale(0.9);
  }
  to {
    opacity: 0.4;
    transform: translate(-50%, -50%) scale(1.1);
  }
}

.welcome-content {
  max-width: 600px;
}

.welcome-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-4);
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.welcome-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
  max-width: 500px;
  margin: 0 auto;
}

/* Welcome Features */
.welcome-features {
  display: flex;
  justify-content: center;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-12);
  flex-wrap: wrap;
}

.feature-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-4);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  min-width: 120px;
}

.feature-item:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.feature-item span {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-align: center;
}

/* Welcome Prompts Section */
.welcome-prompts-section {
  width: 100%;
  max-width: 800px;
}

.prompts-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-6);
  text-align: center;
}

/* Suggested Prompts */
.suggested-prompts {
  display: grid !important;
  grid-template-columns: repeat(3, 1fr) !important;
  gap: var(--spacing-4) !important;
  width: 100% !important;
  max-width: 800px !important;
  margin: 0 auto !important;
  padding: var(--spacing-2) 0 !important;
  flex-direction: row !important;
  flex-wrap: nowrap !important;
  /* Reset any potential conflicting styles */
  align-items: stretch !important;
  justify-content: center !important;
  grid-auto-flow: column !important;
}

/* Force horizontal layout - Debug override */
#suggested-prompts {
  display: grid !important;
  grid-template-columns: 1fr 1fr 1fr !important;
  grid-template-rows: 1fr !important;
  gap: var(--spacing-4) !important;
  width: 100% !important;
  max-width: 800px !important;
  margin: 0 auto !important;
  padding: var(--spacing-2) 0 !important;
}

#suggested-prompts .suggested-prompt {
  grid-column: auto !important;
  grid-row: 1 !important;
  width: 100% !important;
  height: auto !important;
  min-height: 80px !important;
}

.suggested-prompt {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  text-align: center !important;
  gap: var(--spacing-2) !important;
  padding: var(--spacing-4) var(--spacing-3) !important;
  border-radius: var(--radius-lg) !important;
  background: var(--color-surface) !important;
  border: 1px solid var(--color-border) !important;
  transition: all var(--transition-normal) !important;
  cursor: pointer !important;
  position: relative !important;
  overflow: hidden !important;
  min-height: 80px !important;
  /* Ensure button doesn't break grid layout */
  width: 100% !important;
  box-sizing: border-box !important;
  grid-column: auto !important;
  grid-row: auto !important;
}

.suggested-prompt:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.suggested-prompt:active,
.suggested-prompt.clicked {
  transform: translateY(0) scale(0.98);
  box-shadow: var(--shadow-sm);
}

.suggested-prompt-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  width: 100%;
  height: 100%;
  align-items: center;
  text-align: center;
}

.suggested-prompt-text {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
  font-weight: var(--font-weight-medium);
  margin: 0;
  word-wrap: break-word;
  overflow-wrap: break-word;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

.suggested-prompt-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  margin: 0;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

.suggested-prompt:hover .suggested-prompt-description {
  opacity: 1;
}

/* Add subtle animation on load */
.suggested-prompt {
  animation: promptSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  opacity: 0;
  transform: translateY(20px);
}

.suggested-prompt:nth-child(1) { animation-delay: 0.1s; }
.suggested-prompt:nth-child(2) { animation-delay: 0.2s; }
.suggested-prompt:nth-child(3) { animation-delay: 0.3s; }

@keyframes promptSlideIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Message Styles */
.message {
  display: flex;
  gap: var(--spacing-4);
  padding: var(--spacing-4) var(--spacing-1);
  position: relative;
  opacity: 0;
  animation: messageSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-3);
  transition: all var(--transition-normal);
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes messageFadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-content-streaming {
  animation: textReveal 0.3s ease-out;
}

@keyframes textReveal {
  from {
    opacity: 0;
    transform: translateY(5px);
    filter: blur(1px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

.message-typing-indicator {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: var(--spacing-2);
}

.typing-dot {
  width: 6px;
  height: 6px;
  background-color: var(--color-text-tertiary);
  border-radius: 50%;
  animation: typingIndicator 1.4s ease-in-out infinite;
}

@keyframes typingIndicator {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.4;
  }
  30% {
    transform: translateY(-10px);
    opacity: 1;
  }
}

.typing-dot:nth-child(1) { animation-delay: 0s; }
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

.message.user {
  flex-direction: row-reverse;
  background: transparent;
  border: none;
  margin-left: auto;
  margin-right: 0;
  max-width: 92%;
  justify-self: flex-end;
}

/* Assistant message max width */
.message:not(.user) {
  max-width: 95%;
}

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  flex-shrink: 0;
}

.message.user .message-avatar {
  background-color: var(--color-secondary);
}

.message-content {
  flex: 1;
  min-width: 0;
  max-width: 90%;
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-lg);
  background-color: var(--color-background);
  border: 1px solid rgba(229, 231, 235, 0.08);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.message-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-2);
}

.message.user .message-header {
  flex-direction: row-reverse;
}

.message-author {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.message-time {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

.message-body {
  background-color: transparent;
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--spacing-4) var(--spacing-4) var(--spacing-8) var(--spacing-4);
  position: relative;
}

.message.user .message-body {
  background-color: transparent;
  border: none;
}

.message-text {
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

/* Markdown Link Styles - 优化超链接颜色和交互效果 */
.message-text a,
.message-content a {
  color: var(--markdown-link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all 0.2s ease-in-out;
  font-weight: 500;
  position: relative;
}

.message-text a:hover,
.message-content a:hover {
  color: var(--markdown-link-hover);
  border-bottom-color: var(--markdown-link-hover);
  text-decoration: none;
}

.message-text a:visited,
.message-content a:visited {
  color: var(--markdown-link);
  opacity: 0.8;
}

.message-text a:visited:hover,
.message-content a:visited:hover {
  color: var(--markdown-link-hover);
  opacity: 1;
}

.message-text a:active,
.message-content a:active {
  color: var(--markdown-link-hover);
  transform: translateY(1px);
}

/* 相关话题链接特殊样式 */
.message-text a[href="#related_topic"],
.message-content a[href="#related_topic"] {
  display: inline-flex;
  align-items: center;
  padding: 2px 6px;
  margin: 1px 2px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  transition: all 0.2s ease-in-out;
  cursor: pointer;
}

.message-text a[href="#related_topic"]:hover,
.message-content a[href="#related_topic"]:hover {
  background-color: var(--color-surface-hover);
  border-color: var(--markdown-link);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.message-text a[href="#related_topic"]:active,
.message-content a[href="#related_topic"]:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

/* 外部链接样式 */
.message-text a[href^="http"],
.message-content a[href^="http"] {
  position: relative;
}

.message-text a[href^="http"]:after,
.message-content a[href^="http"]:after {
  content: "↗";
  font-size: 0.8em;
  margin-left: 2px;
  opacity: 0.6;
  transition: opacity 0.2s ease-in-out;
}

.message-text a[href^="http"]:hover:after,
.message-content a[href^="http"]:hover:after {
  opacity: 1;
}

/* System Prompt Template Management */
.system-prompt-template-selector {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-2);
}

.system-prompt-template-selector .form-select {
  flex: 1;
}

.template-actions {
  display: flex;
  gap: var(--spacing-1);
  flex-shrink: 0;
}

.template-actions .btn {
  padding: var(--spacing-1) var(--spacing-2);
  min-width: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.template-actions .btn svg {
  width: 16px;
  height: 16px;
}

.template-description {
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  min-height: 60px;
  display: flex;
  align-items: center;
}

.template-description.empty {
  font-style: italic;
  color: var(--color-text-tertiary);
}



#systemPromptTextGroup textarea[readonly] {
  background-color: var(--color-surface-secondary);
  cursor: default;
  resize: vertical;
}

#systemPromptTextGroup textarea:not([readonly]) {
  background-color: var(--color-surface);
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-alpha);
}

/* Template Modal Styles */
.template-modal-content {
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
}

.template-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.template-form .form-group {
  margin-bottom: 0;
}

.template-form textarea {
  resize: vertical;
  min-height: 120px;
}

.template-actions {
  display: flex;
  gap: var(--spacing-3);
  justify-content: flex-end;
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-2);
}

.template-actions .btn {
  min-width: 100px;
}

/* Template Category Styles */
.template-category-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.template-category-badge.category-system {
  background-color: var(--color-surface-tertiary);
  color: var(--color-text-tertiary);
}

.template-category-badge.category-general {
  background-color: var(--color-primary-alpha);
  color: var(--color-primary);
}

.template-category-badge.category-programming {
  background-color: var(--color-success-alpha);
  color: var(--color-success);
}

.template-category-badge.category-creative {
  background-color: var(--color-warning-alpha);
  color: var(--color-warning);
}

.template-category-badge.category-education {
  background-color: var(--color-info-alpha);
  color: var(--color-info);
}

.template-category-badge.category-business {
  background-color: var(--color-secondary-alpha);
  color: var(--color-secondary);
}

.template-category-badge.category-research {
  background-color: var(--color-accent-alpha);
  color: var(--color-accent);
}

.template-category-badge.category-custom {
  background-color: var(--color-danger-alpha);
  color: var(--color-danger);
}

/* Template Options Styling */
.template-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.template-option-content {
  flex: 1;
}

.template-option-name {
  font-weight: 500;
  color: var(--color-text-primary);
}

.template-option-description {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-top: 2px;
}

/* Responsive Design for Template Management */
@media (max-width: 768px) {
  .system-prompt-template-selector {
    flex-direction: column;
    gap: var(--spacing-3);
  }
  
  .template-actions {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .template-modal-content {
    max-width: 95vw;
    margin: var(--spacing-2);
  }
  
  .template-actions {
    flex-direction: column;
  }
  
  .template-actions .btn {
    width: 100%;
  }
  

}

/* Animation for Template Switching */
.template-description {
  transition: all var(--transition-normal);
}

.template-description.updating {
  opacity: 0.6;
  transform: translateY(-2px);
}

.system-prompt-template-selector .form-select {
  transition: border-color var(--transition-fast);
}

.system-prompt-template-selector .form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-alpha);
}

/* Icon Button Styles */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.btn-icon:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
  border-color: var(--color-border-hover);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px var(--color-shadow-light);
}

.btn-icon:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px var(--color-shadow-light);
}

.btn-icon:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-icon.btn-primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn-icon.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-icon.btn-success {
  background: var(--color-success);
  color: white;
  border-color: var(--color-success);
}

.btn-icon.btn-success:hover {
  background: var(--color-success-hover);
  border-color: var(--color-success-hover);
}

.btn-icon.btn-danger {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}

.btn-icon.btn-danger:hover {
  background: var(--color-danger-hover);
  border-color: var(--color-danger-hover);
}

/* Icon + Text Button Styles */
.btn-icon-text {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.btn-icon-text:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px var(--color-shadow-light);
}

.btn-icon-text:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px var(--color-shadow-light);
}

.btn-icon-text.btn-primary {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.btn-icon-text.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn-icon-text.btn-secondary {
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.btn-icon-text.btn-secondary:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
  border-color: var(--color-border-hover);
}



/* Template Actions */
.template-actions {
  display: flex;
  gap: var(--spacing-3);
  justify-content: flex-end;
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-3);
  border-top: 1px solid var(--color-border);
}









/* Universal Icon Button Consistency */
.btn-icon svg,
.btn-icon-text svg,
.btn-sm svg {
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: all var(--transition-fast);
  filter: drop-shadow(0 0.5px 1px rgba(0, 0, 0, 0.1));
  display: block;
  margin: 0 auto;
}

/* Icon Centering for All Button Types */
.btn-icon,
.btn-icon-text,
.btn-sm {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  vertical-align: middle;
  line-height: 1;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-lg);
}

.btn-sm {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* Enhanced Icon Sizing and Positioning */
.btn-icon svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.5;
}

.btn-sm svg {
  width: 16px;
  height: 16px;
  stroke-width: 2.5;
}

.btn-icon-text svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.5;
  margin-right: var(--spacing-2);
  flex-shrink: 0;
}

/* System Prompt Actions Icon Enhancements */
.system-prompt-actions .btn-icon svg {
  transition: all var(--transition-fast);
}

.system-prompt-actions .btn-icon:hover svg {
  transform: scale(1.1);
}



/* Template Management Icon Enhancements */
.template-actions .btn-sm svg {
  transition: all var(--transition-fast);
}

.template-actions .btn-sm:hover svg {
  transform: scale(1.1);
}

.template-actions #addTemplateBtn:hover svg {
  color: var(--color-success);
  transform: scale(1.1) rotate(90deg);
}

.template-actions #editTemplateBtn:hover svg {
  color: var(--color-primary);
}

.template-actions #deleteTemplateBtn:hover svg {
  color: white;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.2));
}



/* Responsive Design */
@media (max-width: 480px) {
  .template-actions {
    flex-direction: column;
    gap: var(--spacing-2);
  }
  
  .template-actions .btn {
    width: 100%;
  }
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: var(--spacing-4);
  right: var(--spacing-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  pointer-events: none;
}

/* Message Actions */
.message-actions {
  position: absolute;
  bottom: var(--spacing-2);
  right: var(--spacing-2);
  display: flex;
  gap: var(--spacing-1);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

/* Hide message actions during streaming */
.message[data-streaming="true"] .message-actions {
  display: none;
}

/* Show message actions on hover only when streaming is complete */
.message:hover .message-actions {
  opacity: 1;
}

/* Ensure message actions are hidden during streaming even on hover */
.message[data-streaming="true"]:hover .message-actions {
  opacity: 0;
  display: none;
}

/* User message actions positioning */
.message.user .message-actions {
  right: auto;
  left: var(--spacing-2);
  bottom: var(--spacing-2);
}

.message-action-btn {
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--spacing-1);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.message-action-btn:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-text-primary);
}

/* Delete button specific styles */
.message-delete-btn {
  color: var(--color-text-tertiary);
}

.message-delete-btn:hover {
  background-color: var(--color-danger);
  color: white;
}

/* Message deleting animation */
.message-deleting {
  opacity: 0.6;
  pointer-events: none;
  position: relative;
}

.message-deleting::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(239, 68, 68, 0.1);
  border: 2px solid var(--color-danger);
  border-radius: var(--radius-md);
  animation: deleteProgress 2s ease-in-out infinite;
}

@keyframes deleteProgress {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.7; }
}

/* Delete confirmation dialog */
.delete-confirmation-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  backdrop-filter: blur(4px);
}

.delete-confirmation-dialog {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  max-width: 400px;
  width: 90%;
  margin: var(--spacing-4);
  overflow: hidden;
  animation: dialogSlideIn 0.3s ease-out;
}

@keyframes dialogSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.delete-confirmation-header {
  padding: var(--spacing-4) var(--spacing-4) var(--spacing-2);
}

.delete-confirmation-header h3 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.delete-confirmation-body {
  padding: var(--spacing-4);
}

.delete-confirmation-body p {
  margin: 0 0 var(--spacing-3);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.message-preview {
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-3);
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  max-height: 100px;
  overflow: hidden;
  position: relative;
}

.message-preview::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 20px;
  background: linear-gradient(transparent, var(--color-surface-secondary));
}

.delete-confirmation-actions {
  padding: var(--spacing-3) var(--spacing-4) var(--spacing-4);
  display: flex;
  gap: var(--spacing-3);
  justify-content: flex-end;
}

.delete-confirmation-actions .btn {
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.delete-confirmation-actions .btn-secondary {
  background: var(--color-surface-secondary);
  color: var(--color-text-primary);
  border-color: var(--color-border);
}

.delete-confirmation-actions .btn-secondary:hover {
  background: var(--color-surface-hover);
}

.delete-confirmation-actions .btn-danger {
  background: var(--color-danger);
  color: white;
}

.delete-confirmation-actions .btn-danger:hover {
  background: #dc2626;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(239, 68, 68, 0.3);
}

/* Loading Indicator */
.loading-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4);
  max-width: var(--max-content-width);
  margin: 0 auto;
  width: 100%;
}

.loading-dots {
  display: flex;
  gap: var(--spacing-1);
}

.loading-dots .dot {
  width: var(--loading-dot-size);
  height: var(--loading-dot-size);
  background-color: var(--color-text-tertiary);
  border-radius: 50%;
  animation: loadingPulse var(--loading-animation-duration) ease-in-out infinite;
}

.loading-dots .dot:nth-child(2) {
  animation-delay: 0.2s;
}

.loading-dots .dot:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes loadingPulse {
  0%, 80%, 100% {
    opacity: 0.3;
    transform: scale(1);
  }
  40% {
    opacity: 1;
    transform: scale(1.2);
  }
}

/* Input Container */
.input-container {
  padding: var(--spacing-4) var(--spacing-6) var(--spacing-6);
  background-color: var(--color-background);
  border-top: 1px solid var(--color-border);
  /* 确保输入容器不会超出视口底部 */
  flex-shrink: 0;
  position: relative;
}

.file-upload-area {
  margin-bottom: var(--spacing-4);
  padding: var(--spacing-4);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.uploaded-files {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.uploaded-file {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  background-color: var(--color-background-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
}

.uploaded-file-remove {
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
}

.uploaded-file-remove:hover {
  color: var(--color-error);
}

/* Message Form */
.message-form {
  max-width: var(--max-content-width);
  margin: 0 auto;
  width: 100%;
}

.input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-hover) 100%);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-3);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.input-wrapper:focus-within {
  /* 移除焦点状态下的边框高亮效果 */
  /* border-color: var(--color-primary); */
  /* box-shadow: 0 0 0 4px var(--color-primary-light), var(--shadow-lg); */
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-surface) 100%);
}

/* File Upload Button */
.file-upload-btn {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-hover) 100%);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.file-upload-btn:hover {
  background: linear-gradient(135deg, var(--color-surface-hover) 0%, var(--color-background) 100%);
  border-color: var(--color-border-focus);
  color: var(--color-text-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.file-upload-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.message-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  resize: none;
  min-height: 44px;
  max-height: 200px;
  padding: 0 var(--spacing-3);
  font-family: var(--font-family-primary);
  font-weight: var(--font-weight-normal);
  display: flex;
  align-items: center;
  vertical-align: middle;
}

.message-input::placeholder {
  color: var(--color-text-tertiary);
}

.send-btn {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-full);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.send-btn:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-primary-hover) 0%, var(--color-primary) 100%);
  transform: scale(1.1) translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.send-btn:disabled {
  background: var(--color-text-tertiary);
  cursor: not-allowed;
  opacity: 0.4;
  transform: scale(0.95);
  box-shadow: none;
}

/* Stop mode styling for send button */
.send-btn.stop-mode {
  background: linear-gradient(135deg, var(--color-text-secondary) 0%, var(--color-text-tertiary) 100%);
  color: var(--color-text-inverse);
  cursor: pointer;
  opacity: 0.8;
  transform: scale(0.95);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  animation: subtle-pulse 3s infinite;
}

.send-btn.stop-mode:hover {
  background: linear-gradient(135deg, var(--color-text-tertiary) 0%, var(--color-text-secondary) 100%);
  transform: scale(1.05) translateY(-1px);
  box-shadow: var(--shadow-md);
  opacity: 1;
}

@keyframes subtle-pulse {
  0%, 100% {
    opacity: 0.8;
    transform: scale(0.95);
  }
  50% {
    opacity: 0.9;
    transform: scale(0.98);
  }
}

/* Upload Progress */
.upload-progress {
  margin-top: var(--spacing-3);
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.progress-bar {
  flex: 1;
  height: 4px;
  background-color: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background-color: var(--color-primary);
  transition: width var(--transition-normal);
  border-radius: var(--radius-full);
}

.progress-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  min-width: 40px;
  text-align: right;
}

/* Custom Scrollbar - Ultra Low Profile Design */
#messages-list::-webkit-scrollbar {
  width: 4px !important;
}

#messages-list::-webkit-scrollbar-track {
  background: transparent !important;
}

#messages-list::-webkit-scrollbar-thumb {
  background: rgba(243, 244, 246, 0.6) !important; /* 亮色主题：与背景极其接近 */
  border-radius: 2px !important;
  transition: all 0.2s ease !important;
}

#messages-list::-webkit-scrollbar-thumb:hover {
  background: rgba(229, 231, 235, 0.8) !important; /* 悬停时稍微明显 */
}

/* Firefox 滚动条 */
#messages-list {
  scrollbar-width: thin !important;
  scrollbar-color: rgba(243, 244, 246, 0.6) transparent !important;
}

/* 暗色主题滚动条 */
[data-theme="dark"] #messages-list::-webkit-scrollbar-thumb {
  background: rgba(55, 65, 81, 0.5) !important; /* 暗色主题：与背景接近 */
}

[data-theme="dark"] #messages-list::-webkit-scrollbar-thumb:hover {
  background: rgba(75, 85, 99, 0.7) !important;
}

[data-theme="dark"] #messages-list {
  scrollbar-color: rgba(55, 65, 81, 0.5) transparent !important;
}

/* 会话列表滚动条保持原样 */
.conversations-list::-webkit-scrollbar {
  width: var(--scrollbar-width);
}

.conversations-list::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

.conversations-list::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-full);
}

.conversations-list::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* Modal Styles */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-4);
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--modal-overlay);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
}

.modal-content {
  position: relative;
  background-color: var(--modal-background);
  border: 1px solid var(--modal-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 600px;
  max-height: 90vh;
  width: 100%;
  z-index: var(--z-modal);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-6);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-background);
}

.modal-header h2 {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-text);
}

.modal-body {
  flex: 1;
  padding: var(--spacing-6);
  overflow-y: auto;
  /* Hide scrollbar for webkit browsers */
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* Internet Explorer 10+ */
}

.modal-body::-webkit-scrollbar {
  display: none; /* Safari and Chrome */
}

.settings-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.settings-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.settings-section h3 {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-2);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.form-group label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: var(--spacing-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-background);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-alpha);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-actions {
  display: flex;
  gap: var(--spacing-3);
  justify-content: flex-end;
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
}

.form-actions button {
  padding: var(--spacing-3) var(--spacing-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.form-actions .btn-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
}

.form-actions .btn-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-hover) 0%, var(--color-primary) 100%);
  border-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.form-actions .btn-secondary {
  background-color: var(--color-background);
  color: var(--color-text);
}

.form-actions .btn-secondary:hover {
  background-color: var(--color-surface-hover);
}

/* Form Validation Styles */
.form-group.error input,
.form-group.error select,
.form-group.error textarea {
  border-color: #ef4444;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-group.success input,
.form-group.success select,
.form-group.success textarea {
  border-color: #10b981;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.validation-message {
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-1);
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
}

.validation-message.error {
  color: #ef4444;
}

.validation-message.success {
  color: #10b981;
}

.validation-message.info {
  color: var(--color-text-secondary);
}

/* Disabled button styles for validation */
.form-actions .btn-primary:disabled {
  background-color: var(--color-border);
  border-color: var(--color-border);
  color: var(--color-text-tertiary);
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.form-actions .btn-primary:disabled:hover {
  background-color: var(--color-border);
  border-color: var(--color-border);
  transform: none;
  box-shadow: none;
}

/* Settings Actions Styles */
.settings-actions {
  display: flex;
  gap: var(--spacing-3);
  justify-content: flex-end;
  align-items: center;
  padding: var(--spacing-5) 0 var(--spacing-2) 0;
  margin-top: var(--spacing-4);
  border-top: 1px solid var(--color-border);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  position: relative;
}

.settings-actions::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, 
    transparent 0%, 
    var(--color-primary) 20%, 
    var(--color-primary) 80%, 
    transparent 100%);
  opacity: 0.3;
}

.settings-actions button {
  padding: var(--spacing-3) var(--spacing-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  min-width: 120px;
  backdrop-filter: blur(5px);
}

.settings-actions button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, 
    transparent 0%, 
    rgba(255, 255, 255, 0.2) 50%, 
    transparent 100%);
  transition: left var(--transition-normal);
}

.settings-actions button:hover::before {
  left: 100%;
}

/* Primary Button in Settings Actions */
.settings-actions .btn-primary {
  background: linear-gradient(135deg, 
    var(--color-primary) 0%, 
    var(--color-primary-dark) 100%);
  border-color: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-md);
  font-weight: var(--font-weight-semibold);
}

.settings-actions .btn-primary:hover {
  background: linear-gradient(135deg, 
    var(--color-primary-hover) 0%, 
    var(--color-primary) 100%);
  border-color: var(--color-primary-hover);
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-xl), 
    0 0 20px rgba(var(--color-primary-rgb), 0.4);
}

.settings-actions .btn-primary:active {
  transform: translateY(0) scale(0.98);
  box-shadow: var(--shadow-sm);
}

/* Secondary Buttons in Settings Actions */
.settings-actions .btn-secondary {
  background: linear-gradient(135deg, 
    var(--color-background) 0%, 
    var(--color-surface) 100%);
  color: var(--color-text);
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.settings-actions .btn-secondary:hover {
  background: linear-gradient(135deg, 
    var(--color-surface-hover) 0%, 
    var(--color-surface) 100%);
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  color: var(--color-primary);
}

.settings-actions .btn-secondary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Special styling for specific action buttons */
.settings-actions #reset-settings-btn:hover {
  border-color: var(--color-danger);
  color: var(--color-danger);
  box-shadow: var(--shadow-lg), 
    0 0 15px rgba(220, 53, 69, 0.2);
}

.settings-actions #import-settings-btn:hover,
.settings-actions #export-settings-btn:hover {
  border-color: var(--color-info);
  color: var(--color-info);
  box-shadow: var(--shadow-lg), 
    0 0 15px rgba(23, 162, 184, 0.2);
}

/* Mobile responsive adjustments */
@media (max-width: 768px) {
  .settings-actions {
    flex-direction: column;
    gap: var(--spacing-2);
    padding: var(--spacing-4) var(--spacing-3);
  }
  
  .settings-actions button {
    width: 100%;
    min-width: unset;
    justify-content: center;
  }
  
  .settings-actions .btn-primary {
    order: -1; /* Move save button to top on mobile */
  }
}

/* 🔄 Hybrid Streaming Styles */
.mermaid-streaming-placeholder {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin: 15px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.mermaid-streaming-placeholder::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(var(--primary-rgb), 0.1), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

.mermaid-loading-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  position: relative;
  z-index: 1;
}

.mermaid-loading-indicator .loading-spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.mermaid-loading-indicator span {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
}

.mermaid-loading-indicator .code-preview {
  background: var(--bg-code);
  color: var(--text-code);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 12px;
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border: 1px solid var(--border-color);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Streaming progress indicator */
.streaming-indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  margin-left: 4px;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.2); }
}

/* Hybrid streaming content transitions */
.message-content[data-streaming="true"] {
  position: relative;
}

.message-content[data-streaming="true"]::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 2px;
  height: 1.2em;
  background: var(--primary);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

/* Enhanced Mermaid diagram protection */
.mermaid-diagram[data-protected="true"] {
  position: relative;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 2px;
  transition: all 0.3s ease;
}

.mermaid-diagram[data-protected="true"]:hover {
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.2);
}

.mermaid-diagram[data-restored="true"] {
  animation: svgRestore 0.5s ease-out;
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.1) 0%, transparent 100%);
}

@keyframes svgRestore {
  0% {
    transform: scale(0.95);
    opacity: 0.7;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Mermaid diagram styles */
.mermaid-diagram {
  position: relative;
  margin: var(--spacing-4) 0;
  border-radius: var(--radius-lg);
  background: var(--code-background);
  border: 1px solid var(--code-border);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.mermaid-diagram:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

/* Mermaid主题切换加载状态 */
.mermaid-loading-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-8);
  background: var(--color-surface-secondary);
  color: var(--color-text-secondary);
  min-height: 120px;
}

.mermaid-loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top: 2px solid var(--color-primary);
  border-radius: 50%;
  animation: mermaid-spin 1s linear infinite;
  margin-bottom: var(--spacing-2);
}

.mermaid-loading-text {
  font-size: 14px;
  color: var(--color-text-tertiary);
}

@keyframes mermaid-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Mermaid主题切换错误状态 */
.mermaid-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-6);
  background: var(--color-error-light);
  color: var(--color-error);
  min-height: 100px;
  border-radius: var(--radius-md);
}

.mermaid-error-icon {
  font-size: 24px;
  margin-bottom: var(--spacing-2);
}

.mermaid-error-text {
  font-size: 14px;
  margin-bottom: var(--spacing-3);
  text-align: center;
}

.mermaid-retry-btn {
  padding: var(--spacing-1) var(--spacing-3);
  background: var(--color-error);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.mermaid-retry-btn:hover {
  background: var(--color-error-dark, #dc2626);
}

/* Mermaid暗色主题特定优化 */
[data-theme="dark"] .mermaid-diagram .mermaid-content svg {
  /* 确保SVG在暗色主题下有正确的背景 */
  background-color: transparent !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg text {
  /* 强制所有文字使用深色 */
  fill: #111827 !important;
  stroke: none !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .node text,
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .label text,
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .edgeLabel text {
  /* 节点、标签和边标签文字优化 - 统一使用深色 */
  fill: #111827 !important;
  font-weight: 500 !important;
  text-shadow: 0 0 2px rgba(255, 255, 255, 0.5) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .node rect,
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .node circle,
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .node polygon {
  /* 节点形状背景优化 - 亮色风格 */
  fill: #f9fafb !important;
  stroke: #e5e7eb !important;
  stroke-width: 2px !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .edgePath path {
  /* 连接线优化 - 亮色风格 */
  stroke: #6b7280 !important;
  stroke-width: 2px !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .edgeLabel rect {
  /* 边标签背景优化 - 亮色风格 */
  fill: #ffffff !important;
  stroke: #e5e7eb !important;
  stroke-width: 1px !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .cluster rect {
  /* 集群背景优化 - 亮色风格 */
  fill: #f9fafb !important;
  stroke: #d1d5db !important;
  stroke-width: 1px !important;
  stroke-dasharray: 5,5 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .actor {
  /* 序列图参与者优化 - 亮色风格 */
  fill: #f9fafb !important;
  stroke: #e5e7eb !important;
  stroke-width: 2px !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .actor text {
  /* 序列图参与者文字优化 - 统一使用深色 */
  fill: #111827 !important;
  font-weight: 600 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .messageText {
  /* 序列图消息文字优化 - 统一使用深色 */
  fill: #111827 !important;
  font-weight: 500 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .loopText {
  /* 序列图循环文字优化 - 统一使用深色 */
  fill: #111827 !important;
  font-weight: 500 !important;
}

/* 甘特图特定样式 - 暗色主题 */
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .grid .tick {
  stroke: #e5e7eb !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .grid .tick text {
  fill: #111827 !important;
  font-family: var(--font-family-base) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .section {
  fill: #f9fafb !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .section text {
  fill: #111827 !important;
  font-family: var(--font-family-base) !important;
  font-weight: var(--font-weight-medium) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .task.active {
  fill: #3b82f6 !important;
  stroke: #1d4ed8 !important;
  stroke-width: 2 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .task.done {
  fill: #10b981 !important;
  stroke: #059669 !important;
  stroke-width: 2 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .task.crit {
  fill: #ef4444 !important;
  stroke: #dc2626 !important;
  stroke-width: 2 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .task text {
  fill: #ffffff !important;
  font-family: var(--font-family-base) !important;
  font-size: 12px !important;
  font-weight: var(--font-weight-medium) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .taskText {
  fill: #111827 !important;
  font-family: var(--font-family-base) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .taskTextOutside {
  fill: #111827 !important;
  font-family: var(--font-family-base) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .todayLine {
  stroke: #ef4444 !important;
  stroke-width: 2px !important;
}

/* 亮色主题下的Mermaid样式 - 与fullscreen-content保持一致 */
[data-theme="light"] .mermaid-diagram .mermaid-content svg text {
  /* 强制所有文字使用与fullscreen-content一致的颜色 */
  fill: #111827 !important;
  stroke: none !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .node text,
[data-theme="light"] .mermaid-diagram .mermaid-content svg .label text,
[data-theme="light"] .mermaid-diagram .mermaid-content svg .edgeLabel text {
  /* 节点、标签和边标签文字优化 - 与--color-text-primary保持一致 */
  fill: #111827 !important;
  font-weight: 500 !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .node rect,
[data-theme="light"] .mermaid-diagram .mermaid-content svg .node circle,
[data-theme="light"] .mermaid-diagram .mermaid-content svg .node polygon {
  /* 节点形状背景优化 */
  fill: #f9fafb !important;
  stroke: #e5e7eb !important;
  stroke-width: 2px !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .edgePath path {
  /* 连接线优化 */
  stroke: #6b7280 !important;
  stroke-width: 2px !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .edgeLabel rect {
  /* 边标签背景优化 */
  fill: #ffffff !important;
  stroke: #e5e7eb !important;
  stroke-width: 1px !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .cluster rect {
  /* 集群背景优化 */
  fill: #f9fafb !important;
  stroke: #d1d5db !important;
}

/* 甘特图特定样式 - 亮色主题 */
[data-theme="light"] .mermaid-diagram .mermaid-content svg .grid .tick {
  stroke: #e5e7eb !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .grid .tick text {
  fill: #111827 !important;
  font-family: var(--font-family-base) !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .section {
  fill: #f9fafb !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .section text {
  fill: #111827 !important;
  font-family: var(--font-family-base) !important;
  font-weight: var(--font-weight-medium) !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .task.active {
  fill: #3b82f6 !important;
  stroke: #1d4ed8 !important;
  stroke-width: 2 !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .task.done {
  fill: #10b981 !important;
  stroke: #059669 !important;
  stroke-width: 2 !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .task.crit {
  fill: #ef4444 !important;
  stroke: #dc2626 !important;
  stroke-width: 2 !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .task text {
  fill: #ffffff !important;
  font-family: var(--font-family-base) !important;
  font-size: 12px !important;
  font-weight: var(--font-weight-medium) !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .taskText {
  fill: #111827 !important;
  font-family: var(--font-family-base) !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .taskTextOutside {
  fill: #111827 !important;
  font-family: var(--font-family-base) !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .todayLine {
  stroke: #ef4444 !important;
  stroke-width: 2px !important;
  stroke-dasharray: 5,5 !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .actor {
  /* 序列图参与者优化 */
  fill: #f9fafb !important;
  stroke: #e5e7eb !important;
  stroke-width: 2px !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .actor text {
  /* 序列图参与者文字优化 - 与--color-text-primary保持一致 */
  fill: #111827 !important;
  font-weight: 600 !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .messageText {
  /* 序列图消息文字优化 - 与--color-text-primary保持一致 */
  fill: #111827 !important;
  font-weight: 500 !important;
}

[data-theme="light"] .mermaid-diagram .mermaid-content svg .loopText {
  /* 序列图循环文字优化 - 与--color-text-primary保持一致 */
  fill: #111827 !important;
  font-weight: 500 !important;
}

/* 暗色主题下的Mermaid样式 - 与fullscreen-content保持一致 */
[data-theme="dark"] .mermaid-diagram .mermaid-content svg text {
  /* 强制所有文字使用与fullscreen-content一致的颜色 */
  fill: #111827 !important;
  stroke: none !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .node text,
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .label text,
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .edgeLabel text {
  /* 节点、标签和边标签文字优化 - 与--color-text-primary保持一致 */
  fill: #111827 !important;
  font-weight: 500 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .node rect,
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .node circle,
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .node polygon {
  /* 节点形状背景优化 */
  fill: #f9fafb !important;
  stroke: #e5e7eb !important;
  stroke-width: 2px !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .edgePath path {
  /* 连接线优化 */
  stroke: #6b7280 !important;
  stroke-width: 2px !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .edgeLabel rect {
  /* 边标签背景优化 */
  fill: #ffffff !important;
  stroke: #e5e7eb !important;
  stroke-width: 1px !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .cluster rect {
  /* 集群背景优化 */
  fill: #f9fafb !important;
  stroke: #d1d5db !important;
}

/* 甘特图特定样式 - 暗色主题 */
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .grid .tick {
  stroke: #e5e7eb !important;
  stroke-width: 1px !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .grid .tick text {
  fill: #e5e7eb !important;
  font-family: var(--font-family-base) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .section {
  fill: #374151 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .section text {
  fill: #e5e7eb !important;
  font-family: var(--font-family-base) !important;
  font-weight: var(--font-weight-medium) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .task.active {
  fill: #3b82f6 !important;
  stroke: #1d4ed8 !important;
  stroke-width: 2 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .task.done {
  fill: #10b981 !important;
  stroke: #059669 !important;
  stroke-width: 2 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .task.crit {
  fill: #ef4444 !important;
  stroke: #dc2626 !important;
  stroke-width: 2 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .task text {
  fill: #ffffff !important;
  font-family: var(--font-family-base) !important;
  font-size: 12px !important;
  font-weight: var(--font-weight-medium) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .taskText {
  fill: #e5e7eb !important;
  font-family: var(--font-family-base) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .taskTextOutside {
  fill: #e5e7eb !important;
  font-family: var(--font-family-base) !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .todayLine {
  stroke: #ef4444 !important;
  stroke-width: 2px !important;
  stroke-dasharray: 5,5 !important;
}

.mermaid-diagram .mermaid-content svg .actor text {
  /* 序列图参与者文字优化 - 与--color-text-primary保持一致 */
  fill: var(--color-text-primary) !important;
  font-weight: 600 !important;
}

.mermaid-diagram .mermaid-content svg .messageText {
  /* 序列图消息文字优化 - 与--color-text-primary保持一致 */
  fill: var(--color-text-primary) !important;
  font-weight: 500 !important;
}

.mermaid-diagram .mermaid-content svg .loopText {
  /* 序列图循环文字优化 - 与--color-text-primary保持一致 */
  fill: var(--color-text-primary) !important;
  font-weight: 500 !important;
}

/* 甘特图特定样式 - 默认主题 */
.mermaid-diagram .mermaid-content svg .grid .tick {
  stroke: var(--color-border) !important;
  stroke-width: 1px !important;
}

.mermaid-diagram .mermaid-content svg .grid .tick text {
  fill: var(--color-text-secondary) !important;
  font-family: var(--font-family-base) !important;
}

.mermaid-diagram .mermaid-content svg .section0,
.mermaid-diagram .mermaid-content svg .section1,
.mermaid-diagram .mermaid-content svg .section2,
.mermaid-diagram .mermaid-content svg .section3,
.mermaid-diagram .mermaid-content svg .section {
  fill: var(--color-surface) !important;
  stroke: var(--color-border) !important;
}

.mermaid-diagram .mermaid-content svg .section text {
  fill: var(--color-text-primary) !important;
  font-family: var(--font-family-base) !important;
  font-weight: var(--font-weight-medium) !important;
}

.mermaid-diagram .mermaid-content svg .task.active {
  fill: #3b82f6 !important;
  stroke: #1d4ed8 !important;
  stroke-width: 2 !important;
}

.mermaid-diagram .mermaid-content svg .task.done {
  fill: #10b981 !important;
  stroke: #059669 !important;
  stroke-width: 2 !important;
}

.mermaid-diagram .mermaid-content svg .task.crit {
  fill: #ef4444 !important;
  stroke: #dc2626 !important;
  stroke-width: 2 !important;
}

.mermaid-diagram .mermaid-content svg .task text {
  fill: #ffffff !important;
  font-family: var(--font-family-base) !important;
  font-size: 12px !important;
  font-weight: var(--font-weight-medium) !important;
}

.mermaid-diagram .mermaid-content svg .taskText {
  fill: var(--color-text-primary) !important;
  font-family: var(--font-family-base) !important;
}

.mermaid-diagram .mermaid-content svg .taskTextOutside {
  fill: var(--color-text-primary) !important;
  font-family: var(--font-family-base) !important;
}

.mermaid-diagram .mermaid-content svg .todayLine {
  stroke: #ef4444 !important;
  stroke-width: 2px !important;
  stroke-dasharray: 5,5 !important;
}

/* 饼图特定样式 */
.mermaid-diagram .mermaid-content svg .pieTitleText {
  fill: var(--color-text-primary) !important;
  font-weight: 600 !important;
}

.mermaid-diagram .mermaid-content svg .slice text {
  fill: var(--color-text-primary) !important;
  font-weight: 500 !important;
}

.mermaid-diagram .mermaid-content svg .legend text {
  fill: var(--color-text-primary) !important;
}

/* 状态图特定样式 */
.mermaid-diagram .mermaid-content svg .state-title {
  fill: var(--color-text-primary) !important;
  font-weight: 600 !important;
}

.mermaid-diagram .mermaid-content svg .state-note {
  fill: var(--color-text-secondary) !important;
}

/* 类图特定样式 */
.mermaid-diagram .mermaid-content svg .classTitle {
  fill: var(--color-text-primary) !important;
  font-weight: 600 !important;
}

.mermaid-diagram .mermaid-content svg .classText {
  fill: var(--color-text-primary) !important;
}

/* Git图特定样式 */
.mermaid-diagram .mermaid-content svg .commit-label {
  fill: var(--color-text-primary) !important;
  font-weight: 500 !important;
}

.mermaid-diagram .mermaid-content svg .branch-label {
  fill: var(--color-text-primary) !important;
  font-weight: 600 !important;
}

/* 旅程图特定样式 */
.mermaid-diagram .mermaid-content svg .journey-section {
  fill: var(--color-surface) !important;
  stroke: var(--color-border) !important;
}

.mermaid-diagram .mermaid-content svg .task-text {
  fill: var(--color-text-primary) !important;
}

/* 暗色主题下强制所有Mermaid文字使用深色 */
[data-theme="dark"] .mermaid-diagram .mermaid-content svg .grid .tick text {
  fill: #111827 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .pieTitleText {
  fill: #111827 !important;
  font-weight: 600 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .slice text {
  fill: #111827 !important;
  font-weight: 500 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .legend text {
  fill: #111827 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .state-title {
  fill: #111827 !important;
  font-weight: 600 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .state-note {
  fill: #111827 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .classTitle {
  fill: #111827 !important;
  font-weight: 600 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .classText {
  fill: #111827 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .commit-label {
  fill: #111827 !important;
  font-weight: 500 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .branch-label {
  fill: #111827 !important;
  font-weight: 600 !important;
}

[data-theme="dark"] .mermaid-diagram .mermaid-content svg .task-text {
  fill: #111827 !important;
}

/* Mermaid header (status bar) */
.mermaid-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-3) var(--spacing-4);
  background: linear-gradient(135deg, 
    rgba(var(--color-text-primary), 0.05) 0%, 
    rgba(var(--color-text-primary), 0.02) 100%);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* Mermaid diagram type label */
.mermaid-type {
  color: var(--color-text-secondary);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: var(--spacing-1) var(--spacing-2);
  background-color: rgba(var(--color-primary-rgb), 0.1);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(var(--color-primary-rgb), 0.2);
}

/* Mermaid header actions container */
.mermaid-header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

/* Mermaid action buttons */
.mermaid-copy-btn,
.mermaid-edit-btn,
.mermaid-fullscreen-btn,
.mermaid-restore-btn,
.mermaid-retry-btn {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-hover) 100%);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

/* Show Mermaid buttons on diagram hover */
.mermaid-diagram:hover .mermaid-copy-btn,
.mermaid-diagram:hover .mermaid-edit-btn,
.mermaid-diagram:hover .mermaid-fullscreen-btn,
.mermaid-diagram:hover .mermaid-restore-btn,
.mermaid-diagram:hover .mermaid-retry-btn {
  opacity: 1;
}

.mermaid-copy-btn:hover,
.mermaid-edit-btn:hover,
.mermaid-fullscreen-btn:hover,
.mermaid-restore-btn:hover,
.mermaid-retry-btn:hover {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
  color: var(--color-text-inverse);
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.mermaid-copy-btn:active,
.mermaid-edit-btn:active,
.mermaid-fullscreen-btn:active,
.mermaid-restore-btn:active,
.mermaid-retry-btn:active {
  transform: scale(0.95);
}

.mermaid-content {
  padding: var(--spacing-4);
  text-align: center;
  background-color: transparent;
}

.mermaid-content svg {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

.mermaid-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  background: linear-gradient(135deg, 
    rgba(var(--color-text-primary), 0.05) 0%, 
    rgba(var(--color-text-primary), 0.02) 100%);
  border-top: 1px solid var(--code-border);
}

.mermaid-actions button {
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--spacing-1);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mermaid-actions button:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-text-secondary);
}

.mermaid-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Mermaid Fallback Styles */
.mermaid-fallback {
  border-color: var(--color-warning);
  background-color: var(--color-warning-light);
}

.mermaid-fallback-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-3) var(--spacing-4);
  background-color: var(--color-warning-bg);
  border-bottom: 1px solid var(--color-warning);
}

.mermaid-label {
  font-weight: var(--font-weight-semibold);
  color: var(--color-warning-text);
  font-size: var(--font-size-sm);
}

.mermaid-fallback-notice {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  font-style: italic;
}

.mermaid-code {
  margin: 0;
  background-color: var(--color-code-bg);
  border: none;
  border-radius: 0;
}

.mermaid-code code {
  background: none;
  padding: var(--spacing-4);
  display: block;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-code-text);
}

.mermaid-retry-btn {
  background-color: var(--color-warning) !important;
  color: var(--color-background) !important;
  border-radius: var(--radius-md) !important;
  padding: var(--spacing-1) var(--spacing-2) !important;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* ===== CODE BLOCK STYLES ===== */

/* Base code block container */
.code-block {
  position: relative;
  margin: var(--spacing-4) 0;
  border-radius: var(--radius-lg);
  background: var(--code-background);
  border: 1px solid var(--code-border);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.code-block:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

/* Code block header */
.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-3) var(--spacing-4);
  background: linear-gradient(135deg, 
    rgba(var(--color-text-primary), 0.05) 0%, 
    rgba(var(--color-text-primary), 0.02) 100%);
  border-bottom: 1px solid var(--code-border);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.code-language {
  color: var(--color-text-secondary);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: var(--spacing-1) var(--spacing-2);
  background-color: rgba(var(--color-primary-rgb), 0.1);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(var(--color-primary-rgb), 0.2);
}

/* Code fullscreen button */
.code-fullscreen-btn {
  position: absolute;
  top: var(--spacing-3);
  right: var(--spacing-3); /* Position on the right */
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-hover) 100%);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 10;
}

/* Code copy button */
.code-copy-btn {
  position: absolute;
  top: var(--spacing-3);
  right: calc(var(--spacing-3) + 40px); /* Position to the left of fullscreen button */
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-hover) 100%);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: var(--spacing-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 10;
}

.code-block:hover .code-fullscreen-btn,
.code-block:hover .code-copy-btn {
  opacity: 1;
}

.code-fullscreen-btn:hover,
.code-copy-btn:hover {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
  color: var(--color-text-inverse);
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.code-fullscreen-btn:active,
.code-copy-btn:active {
  transform: scale(0.95);
}

/* Code content container */
.code-content {
  position: relative;
  overflow-x: auto;
  overflow-y: auto;
  max-height: 500px;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.code-content::-webkit-scrollbar {
  height: 8px;
  width: 8px;
}

.code-content::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
  border-radius: var(--radius-sm);
}

.code-content::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-sm);
}

.code-content::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* Pre and code elements */
pre {
  margin: 0;
  padding: var(--spacing-4);
  background: transparent;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--code-text);
  white-space: pre;
  overflow-x: auto;
  text-rendering: optimizeSpeed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

code {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--code-text);
  background: transparent;
  padding: 0;
  border-radius: 0;
}

/* Inline code */
:not(pre) > code {
  background-color: rgba(var(--code-background), 0.6);
  color: var(--code-text);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  border: 1px solid var(--code-border);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

/* Code block line numbers */
.code-line-numbers {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 40px;
  background: linear-gradient(135deg, 
    rgba(var(--color-text-primary), 0.03) 0%, 
    rgba(var(--color-text-primary), 0.01) 100%);
  border-right: 1px solid var(--code-border);
  padding: var(--spacing-4) var(--spacing-2);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-tertiary);
  text-align: right;
  user-select: none;
  pointer-events: none;
}

.code-content.has-line-numbers pre {
  padding-left: 50px;
}

/* Code block animations */
.code-block {
  animation: codeBlockFadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes codeBlockFadeIn {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Code block success state (after copy) */
.code-copy-btn.success {
  background: linear-gradient(135deg, var(--color-success) 0%, var(--color-success-dark) 100%);
  color: var(--color-text-inverse);
}

/* Code block error state (copy failed) */
.code-copy-btn.error {
  background: linear-gradient(135deg, var(--color-danger) 0%, var(--color-danger-dark) 100%);
  color: var(--color-text-inverse);
  animation: shake 0.5s ease-in-out;
}

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-2px);
  }
  75% {
    transform: translateX(2px);
  }
}

/* Code block loading state */
.code-block.loading {
  opacity: 0.7;
  pointer-events: none;
}

.code-block.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(var(--color-primary-rgb), 0.1) 50%,
    transparent 100%
  );
  animation: codeLoading 1.5s ease-in-out infinite;
}

@keyframes codeLoading {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* Code block responsive design */
@media (max-width: 768px) {
  .code-block {
    margin: var(--spacing-3) 0;
    border-radius: var(--radius-md);
  }
  
  .code-header {
    padding: var(--spacing-2) var(--spacing-3);
    font-size: var(--font-size-xs);
  }
  
  .code-language {
    font-size: 10px;
    padding: 2px var(--spacing-1);
  }
  
  .code-copy-btn {
    top: var(--spacing-2);
    right: var(--spacing-2);
    width: 28px;
    height: 28px;
    padding: var(--spacing-1);
  }
  
  pre {
    padding: var(--spacing-3);
    font-size: var(--font-size-xs);
    line-height: var(--line-height-normal);
  }
  
  .code-content {
    max-height: 300px;
  }
  
  .code-line-numbers {
    width: 32px;
    padding: var(--spacing-3) var(--spacing-1);
    font-size: 10px;
  }
  
  .code-content.has-line-numbers pre {
    padding-left: 40px;
  }
  
  :not(pre) > code {
    font-size: 0.85em;
    padding: 2px var(--spacing-1);
  }
}

@media (max-width: 480px) {
  .code-block {
    margin: var(--spacing-2) -var(--spacing-2);
    border-radius: var(--radius-sm);
    border-left: none;
    border-right: none;
  }
  
  .code-header {
    padding: var(--spacing-2);
  }
  
  .code-copy-btn {
    top: var(--spacing-1);
    right: var(--spacing-1);
    width: 24px;
    height: 24px;
  }
  
  pre {
    padding: var(--spacing-2);
    font-size: 11px;
  }
  
  .code-content {
    max-height: 250px;
  }
  
  .code-line-numbers {
    width: 28px;
    font-size: 9px;
  }
  
  .code-content.has-line-numbers pre {
    padding-left: 36px;
  }
}

/* High DPI displays optimization */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .code-block {
    border-width: 0.5px;
  }
  
  .code-header {
    border-bottom-width: 0.5px;
  }
  
  .code-line-numbers {
    border-right-width: 0.5px;
  }
  
  :not(pre) > code {
    border-width: 0.5px;
  }
}

/* Print styles */
@media print {
  .code-block {
    background: white !important;
    border: 1px solid #ddd !important;
    box-shadow: none !important;
    backdrop-filter: none !important;
    break-inside: avoid;
  }
  
  .code-copy-btn {
    display: none !important;
  }
  
  .code-header {
    background: #f5f5f5 !important;
    border-bottom: 1px solid #ddd !important;
  }
  
  pre {
    color: #333 !important;
    background: transparent !important;
  }
  
  code {
    color: #333 !important;
  }
  
  :not(pre) > code {
    background: #f5f5f5 !important;
    color: #333 !important;
    border: 1px solid #ddd !important;
  }
}

/* Enhanced syntax highlighting styles */
.hljs {
  background: transparent !important;
  color: var(--code-text) !important;
  padding: 0 !important;
  border-radius: 0 !important;
}

/* Syntax highlighting tokens */
.hljs-comment,
.hljs-quote {
  color: var(--color-text-tertiary) !important;
  font-style: italic;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-type {
  color: var(--color-primary) !important;
  font-weight: var(--font-weight-medium);
}

.hljs-string,
.hljs-subst {
  color: var(--color-success) !important;
}

.hljs-number,
.hljs-literal,
.hljs-variable,
.hljs-template-variable {
  color: var(--color-warning) !important;
}

.hljs-function,
.hljs-title {
  color: var(--color-info) !important;
  font-weight: var(--font-weight-medium);
}

.hljs-attr,
.hljs-attribute {
  color: var(--color-text-secondary) !important;
}

.hljs-built_in,
.hljs-builtin-name {
  color: var(--color-primary-dark) !important;
}

.hljs-class .hljs-title {
  color: var(--color-info-dark) !important;
  font-weight: var(--font-weight-semibold);
}

.hljs-meta {
  color: var(--color-text-tertiary) !important;
}

.hljs-meta-string {
  color: var(--color-success-dark) !important;
}

.hljs-regexp {
  color: var(--color-danger) !important;
}

.hljs-symbol {
  color: var(--color-warning-dark) !important;
}

.hljs-tag {
  color: var(--color-text-primary) !important;
}

.hljs-name {
  color: var(--color-primary) !important;
  font-weight: var(--font-weight-medium);
}

.hljs-selector-id,
.hljs-selector-class {
  color: var(--color-info) !important;
}

.hljs-selector-attr,
.hljs-selector-pseudo {
  color: var(--color-warning) !important;
}

.hljs-addition {
  background-color: rgba(var(--color-success-rgb), 0.1) !important;
  color: var(--color-success-dark) !important;
}

.hljs-deletion {
  background-color: rgba(var(--color-danger-rgb), 0.1) !important;
  color: var(--color-danger-dark) !important;
}

.hljs-emphasis {
  font-style: italic;
}

.hljs-strong {
  font-weight: var(--font-weight-bold);
}

/* Language-specific optimizations */
.hljs.language-javascript .hljs-keyword,
.hljs.language-js .hljs-keyword {
  color: var(--color-primary) !important;
}

.hljs.language-python .hljs-keyword {
  color: var(--color-primary-dark) !important;
}

.hljs.language-css .hljs-selector-tag {
  color: var(--color-info) !important;
}

.hljs.language-html .hljs-tag {
  color: var(--color-text-secondary) !important;
}

.hljs.language-json .hljs-attr {
  color: var(--color-info) !important;
}

/* Code block focus and selection */
.code-block:focus-within {
  box-shadow: var(--shadow-lg), 0 0 0 2px rgba(var(--color-primary-rgb), 0.2);
  outline: none;
}

pre::selection,
code::selection {
  background-color: rgba(var(--color-primary-rgb), 0.2);
  color: inherit;
}

pre::-moz-selection,
code::-moz-selection {
  background-color: rgba(var(--color-primary-rgb), 0.2);
  color: inherit;
}

/* Code block accessibility */
.code-block[tabindex="0"]:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.code-copy-btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  .code-block,
  .code-copy-btn {
    animation: none;
    transition: none;
  }
  
  .code-block:hover {
    transform: none;
  }
  
  .code-copy-btn:hover {
    transform: none;
  }
  
  .code-copy-btn:active {
    transform: none;
  }
}

.mermaid-retry-btn:hover {
  background-color: var(--color-warning-dark) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* ===== MERMAID LOADING STATES ===== */

/* Mermaid loading container */
.mermaid-loading {
  background: linear-gradient(135deg, 
    rgba(var(--color-info-rgb), 0.05) 0%, 
    rgba(var(--color-info-rgb), 0.02) 100%);
  border: 1px solid rgba(var(--color-info-rgb), 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  margin: var(--spacing-4) 0;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.mermaid-loading::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(var(--color-info-rgb), 0.1) 50%,
    transparent 100%
  );
  animation: mermaidLoading 2s ease-in-out infinite;
}

@keyframes mermaidLoading {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

/* Mermaid loading content */
.mermaid-loading-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-3);
  position: relative;
  z-index: 1;
}

.mermaid-loading-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-info) 0%, var(--color-info-dark) 100%);
  color: var(--color-text-inverse);
  animation: mermaidSpin 1s linear infinite;
}

.mermaid-loading-spinner svg {
  animation: mermaidSpinReverse 1.5s linear infinite;
}

@keyframes mermaidSpin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes mermaidSpinReverse {
  from {
    transform: rotate(360deg);
  }
  to {
    transform: rotate(0deg);
  }
}

.mermaid-loading-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.mermaid-loading-text .mermaid-label {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.mermaid-loading-text .mermaid-status {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  font-style: italic;
  animation: mermaidPulse 2s ease-in-out infinite;
}

@keyframes mermaidPulse {
  0%, 100% {
    opacity: 0.6;
  }
  50% {
    opacity: 1;
  }
}

/* Mermaid preview code in loading state */
.mermaid-preview-code {
  background: rgba(var(--code-background), 0.3);
  border: 1px solid var(--code-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-3);
  position: relative;
  z-index: 1;
}

.mermaid-preview-code pre {
  margin: 0;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  line-height: var(--line-height-normal);
  color: var(--color-text-tertiary);
  max-height: 150px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.mermaid-preview-code pre::-webkit-scrollbar {
  width: 4px;
}

.mermaid-preview-code pre::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

.mermaid-preview-code pre::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-sm);
}

.mermaid-preview-code code {
  background: transparent;
  padding: 0;
  border: none;
  font-size: inherit;
  color: inherit;
}

/* Responsive design for loading states */
@media (max-width: 768px) {
  .mermaid-loading {
    padding: var(--spacing-3);
    margin: var(--spacing-3) 0;
  }
  
  .mermaid-loading-content {
    gap: var(--spacing-2);
  }
  
  .mermaid-loading-spinner {
    width: 24px;
    height: 24px;
  }
  
  .mermaid-loading-text .mermaid-label {
    font-size: var(--font-size-xs);
  }
  
  .mermaid-loading-text .mermaid-status {
    font-size: 10px;
  }
  
  .mermaid-preview-code {
    padding: var(--spacing-2);
  }
  
  .mermaid-preview-code pre {
    font-size: 10px;
    max-height: 100px;
  }
}

/* Dark theme adjustments */
[data-theme="dark"] .mermaid-loading {
  background: linear-gradient(135deg, 
    rgba(var(--color-info-rgb), 0.08) 0%, 
    rgba(var(--color-info-rgb), 0.03) 100%);
}

[data-theme="dark"] .mermaid-preview-code {
  background: rgba(var(--code-background), 0.4);
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  .mermaid-loading::before,
  .mermaid-loading-spinner,
  .mermaid-loading-spinner svg,
  .mermaid-loading-text .mermaid-status {
    animation: none;
  }
  
  .mermaid-loading-text .mermaid-status {
    opacity: 0.8;
  }
}

/* Spinning animation for loading states */
.spinning {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Drop Zone Overlay */
.drop-zone-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(16, 163, 127, 0.1);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
}

.drop-zone-content {
  text-align: center;
  color: var(--color-primary);
  padding: var(--spacing-8);
  border: 2px dashed var(--color-primary);
  border-radius: var(--radius-xl);
  background-color: var(--color-background);
}

.drop-zone-content svg {
  margin-bottom: var(--spacing-4);
}

.drop-zone-content p {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
}

/* Utility Classes */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.fade-in {
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.slide-in-left {
  animation: slideInLeft 0.3s ease-out;
}

@keyframes slideInLeft {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

.slide-in-right {
  animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

/* ===== CODE BLOCK DELAYED INSERTION STYLES ===== */

/* Code Block Placeholder Styles */
.code-block-placeholder {
  position: relative;
  background: linear-gradient(135deg, var(--color-background-secondary) 0%, var(--color-background-tertiary) 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  margin: var(--spacing-3) 0;
  min-height: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.code-block-placeholder:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.1);
}

/* Placeholder Header */
.placeholder-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-3);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.placeholder-language {
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Loading Animation */
.placeholder-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-3);
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* Progress Bar */
.progress-container {
  width: 100%;
  max-width: 200px;
  height: 4px;
  background: var(--color-background-tertiary);
  border-radius: 2px;
  overflow: hidden;
  margin-top: var(--spacing-2);
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: 2px;
  animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
  0% { width: 0%; }
  50% { width: 70%; }
  100% { width: 100%; }
}

/* Preview Toggle */
.preview-toggle {
  position: absolute;
  top: var(--spacing-2);
  right: var(--spacing-2);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.preview-toggle:hover {
  background: var(--color-background-secondary);
  color: var(--color-text-primary);
}

/* Preview Content */
.preview-content {
  position: absolute;
  bottom: var(--spacing-2);
  left: var(--spacing-2);
  right: var(--spacing-2);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-2);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  max-height: 60px;
  overflow: hidden;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease;
}

.preview-content.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Final Code Block Container */
.final-code-block {
  position: relative;
  margin: var(--spacing-3) 0;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  background: var(--color-background-secondary);
  border: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease;
}

.final-code-block.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Code Block Header */
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-2) var(--spacing-3);
  background: var(--color-background-tertiary);
  border-bottom: 1px solid var(--color-border);
}

.code-language-tag {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.code-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
}

.code-action-btn {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.code-action-btn:hover {
  background: var(--color-background);
  color: var(--color-text-primary);
  border-color: var(--color-primary);
}

/* Code Block Content */
.code-block-content {
  position: relative;
  max-height: 500px;
  overflow-y: auto;
  overflow-x: auto;
}

.code-block-content pre {
  margin: 0;
  padding: var(--spacing-3);
  background: transparent;
  border: none;
  border-radius: 0;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

/* Code Block Footer */
.code-block-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-2) var(--spacing-3);
  background: var(--color-background-tertiary);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.code-stats {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.expand-toggle {
  background: transparent;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: var(--font-size-xs);
  font-weight: 500;
  transition: color 0.2s ease;
}

.expand-toggle:hover {
  color: var(--color-primary-dark);
}

/* Fade In Animation */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.5s ease-out;
}

/* Dark Theme Adjustments */
[data-theme="dark"] .code-block-placeholder {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.02) 100%);
  border-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .code-block-placeholder:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.2);
}

[data-theme="dark"] .loading-spinner {
  border-color: rgba(255, 255, 255, 0.1);
  border-top-color: var(--color-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .code-block-placeholder {
    padding: var(--spacing-3);
    min-height: 100px;
  }
  
  .placeholder-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-1);
  }
  
  .code-block-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-2);
  }
  
  .code-actions {
    width: 100%;
    justify-content: flex-end;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  .code-block-placeholder,
  .final-code-block,
  .preview-content,
  .loading-spinner,
  .progress-bar {
    animation: none;
    transition: none;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .code-block-placeholder {
    border-width: 2px;
    background: var(--color-background);
  }
  
  .placeholder-language {
    border: 1px solid var(--color-text-primary);
  }
  
  .theme-toggle:hover {
    border: 1px solid var(--color-text-primary);
  }
}

/* Mobile Message Layout Optimization */
@media (max-width: 768px) {
  .messages-list {
    padding: var(--spacing-4) 0;
  }
  
  .message {
    padding: var(--spacing-3) var(--spacing-1);
    gap: var(--spacing-2);
  }
  
  .message.user {
    max-width: 98%;
  }
  
  .message:not(.user) {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .messages-list {
    padding: var(--spacing-2) 0;
  }
  
  .message {
    padding: var(--spacing-2) 2px;
    gap: var(--spacing-1);
  }
  
  .message.user {
    max-width: 100%;
    margin-right: 2px;
  }
  
  .message:not(.user) {
    max-width: 100%;
    margin-left: 2px;
  }
  
  .message-avatar {
    width: 24px;
    height: 24px;
    font-size: 10px;
    flex-shrink: 0;
  }
  
  .message-content {
    padding: var(--spacing-2) var(--spacing-2);
  }
}

/* ===== FULLSCREEN MODAL STYLES ===== */

/* Fullscreen Modal Container */
.fullscreen-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
}

.fullscreen-modal.show {
  opacity: 1;
  visibility: visible;
}

.fullscreen-modal.closing {
  opacity: 0;
  visibility: hidden;
}

/* Fullscreen Modal Styles */
.settings-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

/* System Prompt Description Styles */
.system-prompt-description {
    margin: var(--spacing-4) 0 var(--spacing-6) 0;
    padding: var(--spacing-5);
    background: linear-gradient(135deg, 
        var(--color-surface-secondary) 0%, 
        var(--color-surface) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.system-prompt-description .description-content {
    max-width: 100%;
}

.system-prompt-description .description-text {
    margin: 0 0 var(--spacing-4) 0;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    font-weight: 400;
}

.system-prompt-description .features-list {
    margin: var(--spacing-4) 0;
}

.system-prompt-description .features-title,
.system-prompt-description .examples-title {
    margin: 0 0 var(--spacing-3) 0;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.system-prompt-description .features-items {
    margin: 0;
    padding-left: var(--spacing-5);
    list-style: none;
}

.system-prompt-description .features-items li {
    position: relative;
    margin-bottom: var(--spacing-2);
    padding-left: var(--spacing-4);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    line-height: 1.5;
}

.system-prompt-description .features-items li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.system-prompt-description .examples-section {
    margin-top: var(--spacing-5);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--color-border-light);
}

.system-prompt-description .examples-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2);
    margin-top: var(--spacing-3);
}

.system-prompt-description .example-item {
    padding: var(--spacing-3);
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.system-prompt-description .example-item:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.system-prompt-description .example-item span {
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    line-height: 1.4;
    font-style: italic;
}

/* Responsive design for system prompt description */
@media (min-width: 768px) {
    .system-prompt-description .examples-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-3);
    }
}

/* Fullscreen Backdrop */
.fullscreen-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  cursor: pointer;
}

/* Fullscreen Content Container */
.fullscreen-content {
  position: relative;
  width: 95%;
  height: 90%;
  max-width: 1200px;
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--transition-normal) cubic-bezier(0.4, 0, 0.2, 1);
}

.fullscreen-modal.show .fullscreen-content {
  transform: scale(1);
}

.fullscreen-modal.closing .fullscreen-content {
  transform: scale(0.9);
}

/* Fullscreen Header */
.fullscreen-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4) var(--spacing-6);
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-surface) 100%);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.fullscreen-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.fullscreen-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

/* Fullscreen Action Buttons */
.fullscreen-copy-btn,
.fullscreen-close-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.fullscreen-copy-btn:hover,
.fullscreen-close-btn:hover {
  background: var(--color-background);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.fullscreen-copy-btn:active,
.fullscreen-close-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.fullscreen-close-btn:hover {
  border-color: var(--color-error);
  color: var(--color-error);
}

/* Fullscreen Body */
.fullscreen-body {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Code Container in Fullscreen */
.fullscreen-code-container {
  flex: 1;
  overflow: auto;
  background: var(--color-background);
  margin: var(--spacing-4);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
}

.fullscreen-code-container pre {
  margin: 0;
  padding: var(--spacing-6);
  background: transparent;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--code-text);
  white-space: pre;
  overflow: visible;
  text-rendering: optimizeSpeed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.fullscreen-code-container code {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-base);
  color: var(--code-text);
  background: transparent;
  padding: 0;
  border-radius: 0;
  word-wrap: break-word;
  white-space: pre-wrap;
}

/* Mermaid Container in Fullscreen */
.fullscreen-mermaid-container {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-background);
  margin: var(--spacing-4);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  padding: var(--spacing-6);
}

.fullscreen-mermaid-container svg {
  max-width: 100%;
  max-height: 100%;
  height: auto;
  width: auto;
}

/* Custom Scrollbar for Fullscreen */
.fullscreen-code-container::-webkit-scrollbar,
.fullscreen-mermaid-container::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

.fullscreen-code-container::-webkit-scrollbar-track,
.fullscreen-mermaid-container::-webkit-scrollbar-track {
  background: var(--color-background);
  border-radius: var(--radius-full);
}

.fullscreen-code-container::-webkit-scrollbar-thumb,
.fullscreen-mermaid-container::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-background);
}

.fullscreen-code-container::-webkit-scrollbar-thumb:hover,
.fullscreen-mermaid-container::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-tertiary);
}

/* Copy Success Animation */
.fullscreen-copy-btn.copied {
  background: var(--color-success) !important;
  border-color: var(--color-success) !important;
  color: white !important;
  transform: scale(1.1);
}

.fullscreen-copy-btn.copied svg {
  animation: copy-success 0.3s ease-in-out;
}

@keyframes copy-success {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

/* Dark Theme Adjustments */
[data-theme="dark"] .fullscreen-backdrop {
  background: rgba(0, 0, 0, 0.9);
}

[data-theme="dark"] .fullscreen-content {
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
}

[data-theme="dark"] .fullscreen-header {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-background) 100%);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .fullscreen-content {
    width: 98%;
    height: 95%;
    border-radius: var(--radius-xl);
  }
  
  .fullscreen-header {
    padding: var(--spacing-3) var(--spacing-4);
  }
  
  .fullscreen-title {
    font-size: var(--font-size-base);
  }
  
  .fullscreen-copy-btn,
  .fullscreen-close-btn {
    width: 36px;
    height: 36px;
  }
  
  .fullscreen-code-container,
  .fullscreen-mermaid-container {
    margin: var(--spacing-2);
    border-radius: var(--radius-lg);
  }
  
  .fullscreen-code-container pre {
    padding: var(--spacing-4);
    font-size: var(--font-size-sm);
  }
}

@media (max-width: 480px) {
  .fullscreen-content {
    width: 100%;
    height: 100%;
    border-radius: 0;
  }
  
  .fullscreen-header {
    padding: var(--spacing-2) var(--spacing-3);
  }
  
  .fullscreen-code-container,
  .fullscreen-mermaid-container {
    margin: var(--spacing-1);
    border-radius: var(--radius-md);
  }
  
  .fullscreen-code-container pre {
    padding: var(--spacing-3);
    font-size: var(--font-size-xs);
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  .fullscreen-modal,
  .fullscreen-content,
  .fullscreen-copy-btn,
  .fullscreen-close-btn {
    transition: none;
    animation: none;
  }
  
  .fullscreen-modal.show .fullscreen-content {
    transform: scale(1);
  }
}

/* High Contrast Mode */
@media (forced-colors: active) {
  .fullscreen-backdrop {
    background: Canvas;
  }
  
  .fullscreen-content {
    background: Canvas;
    border: 2px solid ButtonText;
  }
  
  .fullscreen-copy-btn,
  .fullscreen-close-btn {
    border: 2px solid var(--color-text-primary);
  }
}

/* ===== CUSTOM SELECT DROPDOWN ARROW STYLES ===== */

/* 设置界面下拉选择控件样式优化 */
.modal-content .form-group select {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232563eb' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 8px center; /* 箭头左移，从默认的 12px 改为 8px */
  background-size: 16px;
  padding-right: 32px; /* 为箭头留出空间 */
}

/* 暗色主题下的箭头颜色 */
[data-theme="dark"] .modal-content .form-group select {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233b82f6' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
}

/* 聚焦状态下的箭头颜色 */
.modal-content .form-group select:focus {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231d4ed8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
}

/* 悬停状态下的箭头效果 */
.modal-content .form-group select:hover {
  background-position: right 6px center; /* 悬停时箭头再稍微左移一点 */
  transition: background-position 0.2s ease;
}

/* 响应式设计 - 移动端优化 */
@media (max-width: 768px) {
  .modal-content .form-group select {
    background-position: right 6px center; /* 移动端箭头更靠左 */
    background-size: 14px;
    padding-right: 28px;
  }
  
  .modal-content .form-group select:hover {
    background-position: right 4px center;
  }
}

/* RTL 语言支持 */
[dir="rtl"] .modal-content .form-group select {
  background-position: left 8px center;
  padding-right: var(--spacing-3);
  padding-left: 32px;
}

[dir="rtl"] .modal-content .form-group select:hover {
  background-position: left 6px center;
}

@media (max-width: 768px) {
  [dir="rtl"] .modal-content .form-group select {
    background-position: left 6px center;
    padding-left: 28px;
  }
  
  [dir="rtl"] .modal-content .form-group select:hover {
    background-position: left 4px center;
  }
}

/* ===== STREAMING HEARTBEAT UI OPTIMIZATION ===== */

/* Streaming Indicator Container - 优化位置和布局 */
.streaming-indicator-container {
  position: absolute;
  bottom: var(--spacing-2);
  left: var(--spacing-3);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  width: 24px;
  height: 24px;
  background: rgba(var(--color-bg-primary-rgb), 0.9);
  border-radius: 50%;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(var(--color-border-rgb), 0.3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

/* Streaming Indicator Dot - 优化动画和视觉效果，独立于DOM更新 */
.streaming-indicator {
  display: block;
  width: 8px;
  height: 8px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark, #0d8f6f));
  border-radius: 50%;
  position: relative;
  flex-shrink: 0;
  /* 使用 will-change 优化动画性能 */
  will-change: transform, opacity, box-shadow;
  /* 确保动画独立运行，不受DOM更新影响 */
  animation: streamingPulse 3600ms ease-in-out infinite;
  animation-fill-mode: both;
  animation-play-state: running;
  box-shadow: 0 0 0 0 rgba(var(--color-primary-rgb), 0.7);
}

/* 优化的脉冲动画 - 减少幅度，更加微妙 */
@keyframes streamingPulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.8;
    box-shadow: 0 0 0 0 rgba(var(--color-primary-rgb), 0.7);
  }
  25% {
    transform: scale(1.05);
    opacity: 0.85;
    box-shadow: 0 0 0 1px rgba(var(--color-primary-rgb), 0.4);
  }
  50% {
    transform: scale(1.15);
    opacity: 0.95;
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.2);
  }
  75% {
    transform: scale(1.05);
    opacity: 0.85;
    box-shadow: 0 0 0 1px rgba(var(--color-primary-rgb), 0.3);
  }
}



/* 暗色主题适配 */
[data-theme="dark"] .streaming-indicator {
  background: linear-gradient(135deg, var(--color-primary), #14b8a6);
}

[data-theme="dark"] .streaming-indicator-container {
  background: rgba(var(--color-bg-primary-rgb), 0.95);
  border-color: rgba(var(--color-border-rgb), 0.4);
}



/* 心跳点容器悬停效果 */
.streaming-indicator-container:hover {
  background: rgba(var(--color-bg-primary-rgb), 1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transform: translateY(-1px);
}



/* 响应式调整 */
@media (max-width: 768px) {
  .streaming-indicator {
    width: 6px;
    height: 6px;
  }
  
  .streaming-indicator-container {
    bottom: var(--spacing-1);
    left: var(--spacing-2);
    width: 20px;
    height: 20px;
  }
}

/* 减少动画偏好设置 */
@media (prefers-reduced-motion: reduce) {
  .streaming-indicator {
    animation: none;
    opacity: 0.8;
    transform: scale(1);
  }
  
  .streaming-indicator-container {
    transition: none;
  }
  

}