/**
 * Design System - 元造数字AI助手
 * 磨砂玻璃态设计风格
 * 版本: v3.0
 */

/* ============================================
   1. CSS Variables / Design Tokens
   ============================================ */

:root {
  /* Primary Colors */
  --color-primary-50: #E8F3FF;
  --color-primary-100: #BEDAFF;
  --color-primary-200: #94BFFF;
  --color-primary-300: #6AA1FF;
  --color-primary-400: #4080FF;
  --color-primary-500: #165DFF;
  --color-primary-600: #114ECC;
  --color-primary-700: #0E3DAA;
  --color-primary-800: #0A2D88;
  --color-primary-900: #071F66;

  /* Semantic Colors */
  --color-success: #00B42A;
  --color-success-light: #27C346;
  --color-success-bg: rgba(0, 180, 42, 0.1);
  --color-warning: #FF7D00;
  --color-warning-light: #FF9626;
  --color-warning-bg: rgba(255, 125, 0, 0.1);
  --color-error: #F53F3F;
  --color-error-light: #F76965;
  --color-error-bg: rgba(245, 63, 63, 0.1);
  --color-info: #3491FA;
  --color-info-light: #5495F6;
  --color-info-bg: rgba(52, 145, 250, 0.1);

  /* Light Theme - Background */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F0F4FF;
  --bg-tertiary: #E8F3FF;
  --bg-gradient: linear-gradient(135deg, #F0F4FF 0%, #FFFFFF 100%);
  --bg-gradient-sidebar: linear-gradient(180deg, #F7F8FA 0%, #F0F4FF 100%);
  --bg-gradient-main: linear-gradient(180deg, #FFFFFF 0%, #F8FAFF 100%);

  /* Glass Background - Light */
  --glass-bg-default: rgba(255,255,255, 0.25);
  --glass-bg-hover: rgba(255,255,255, 0.40);
  --glass-bg-strong: rgba(255,255,255, 0.50);
  --glass-bg-subtle: rgba(255,255,255, 0.10);
  --glass-bg-input: rgba(255,255,255, 0.20);

  /* Text Colors - Light */
  --text-primary: #1D2129;
  --text-secondary: #4E5969;
  --text-tertiary: #86909C;
  --text-quaternary: #C9CDD4;
  --text-link: #165DFF;
  --text-link-hover: #114ECC;

  /* Border Colors - Light */
  --border-default: rgba(0, 0, 0, 0.08);
  --border-light: rgba(0, 0, 0, 0.04);
  --border-dark: rgba(0, 0, 0, 0.12);
  --border-glass: rgba(255, 255, 255, 0.50);

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-family-mono: 'SFMono-Regular', 'Fira Code', 'JetBrains Mono', Consolas, 'Liberation Mono', Menlo, Courier, monospace;

  /* Font Sizes */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows - Light */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.20);
  --shadow-glass: 0 8px 32px rgba(31, 38, 135, 0.15);
  --shadow-glass-lg: 0 16px 48px rgba(31, 38, 135, 0.20);
  --shadow-glow: 0 0 20px rgba(22, 93, 255, 0.30);
  --shadow-glow-lg: 0 0 40px rgba(22, 93, 255, 0.40);

  /* Backdrop Blur */
  --blur-sm: blur(4px);
  --blur-md: blur(12px);
  --blur-lg: blur(20px);
  --blur-xl: blur(32px);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Z-Index Scale */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-tooltip: 400;
  --z-toast: 500;
}

/* Dark Theme */
.dark-mode {
  /* Background */
  --bg-primary: #17171A;
  --bg-secondary: #232324;
  --bg-tertiary: #2E2E30;
  --bg-gradient: linear-gradient(135deg, #17171A 0%, #232324 100%);
  --bg-gradient-sidebar: linear-gradient(180deg, #1A1A1D 0%, #232324 100%);
  --bg-gradient-main: linear-gradient(180deg, #17171A 0%, #1F1F22 100%);

  /* Glass Background - Dark */
  --glass-bg-default: rgba(0, 0, 0, 0.25);
  --glass-bg-hover: rgba(0, 0, 0, 0.40);
  --glass-bg-strong: rgba(0, 0, 0, 0.45);
  --glass-bg-subtle: rgba(0, 0, 0, 0.15);
  --glass-bg-input: rgba(0, 0, 0, 0.20);

  /* Text Colors - Dark */
  --text-primary: #F7F8FA;
  --text-secondary: #C9CDD4;
  --text-tertiary: #86909C;
  --text-quaternary: #4E5969;
  --text-link: #6AA1FF;
  --text-link-hover: #94BFFF;

  /* Border Colors - Dark */
  --border-default: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.04);
  --border-dark: rgba(255, 255, 255, 0.12);
  --border-glass: rgba(255, 255, 255, 0.10);

  /* Shadows - Dark */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.20);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.30);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.40);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.50);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.60);
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.40);
  --shadow-glass-lg: 0 16px 48px rgba(0, 0, 0, 0.50);
}

/* ============================================
   2. Base Styles & Reset
   ============================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background: var(--bg-gradient);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Selection */
::selection {
  background: var(--color-primary-200);
  color: var(--color-primary-900);
}

.dark-mode ::selection {
  background: var(--color-primary-700);
  color: var(--color-primary-100);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--text-quaternary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* ============================================
   3. Glass Components
   ============================================ */

/* Glass Card */
.glass-card {
  background: var(--glass-bg-default);
  backdrop-filter: var(--blur-lg);
  -webkit-backdrop-filter: var(--blur-lg);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-glass);
  transition: all var(--transition-base);
}

.glass-card:hover {
  background: var(--glass-bg-hover);
  box-shadow: var(--shadow-glass-lg);
}

.glass-card--strong {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--blur-xl);
}

.glass-card--subtle {
  background: var(--glass-bg-subtle);
  backdrop-filter: var(--blur-md);
}

/* Glass Button */
.glass-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  background: var(--glass-bg-default);
  backdrop-filter: var(--blur-md);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.glass-button:hover {
  background: var(--glass-bg-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.glass-button:active {
  transform: scale(0.98);
}

.glass-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.glass-button--primary {
  background: var(--color-primary-500);
  color: white;
  border: none;
  box-shadow: var(--shadow-glow);
}

.glass-button--primary:hover {
  background: var(--color-primary-600);
  box-shadow: var(--shadow-glow-lg);
}

.glass-button--ghost {
  background: transparent;
  border-color: transparent;
}

.glass-button--ghost:hover {
  background: var(--glass-bg-subtle);
}

.glass-button--icon {
  padding: var(--space-3);
  border-radius: var(--radius-lg);
}

/* Glass Input */
.glass-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: var(--glass-bg-input);
  backdrop-filter: var(--blur-md);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  outline: none;
  transition: all var(--transition-fast);
}

.glass-input::placeholder {
  color: var(--text-quaternary);
}

.glass-input:hover {
  background: var(--glass-bg-default);
}

.glass-input:focus {
  background: var(--glass-bg-default);
  border-color: var(--color-primary-400);
  box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.15);
}

.glass-input--multiline {
  min-height: 100px;
  resize: vertical;
}

/* ============================================
   4. Message Components
   ============================================ */

/* Message Bubble */
.message-bubble {
  max-width: 85%;
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-2xl);
  backdrop-filter: var(--blur-lg);
  animation: messageAppear 0.3s var(--transition-bounce);
}

@keyframes messageAppear {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.message-bubble--user {
  background: rgba(22, 93, 255, 0.15);
  border: 1px solid rgba(22, 93, 255, 0.20);
  border-radius: var(--radius-2xl) var(--radius-2xl) var(--radius-sm) var(--radius-2xl);
  margin-left: auto;
}

.message-bubble--assistant {
  background: var(--glass-bg-default);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm) var(--radius-2xl) var(--radius-2xl) var(--radius-2xl);
}

.dark-mode .message-bubble--user {
  background: rgba(22, 93, 255, 0.25);
  border-color: rgba(22, 93, 255, 0.30);
}

/* Message Avatar */
.message-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: var(--font-weight-bold);
  color: white;
}

.message-avatar--user {
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-600));
  box-shadow: var(--shadow-glow);
}

.message-avatar--assistant {
  background: linear-gradient(135deg, #8B5CF6, #6366F1);
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.30);
}

/* Thinking Indicator */
.thinking-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--glass-bg-subtle);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.thinking-indicator__dots {
  display: flex;
  gap: 4px;
}

.thinking-indicator__dot {
  width: 6px;
  height: 6px;
  background: var(--color-primary-500);
  border-radius: var(--radius-full);
  animation: thinkingDot 1.4s infinite ease-in-out both;
}

.thinking-indicator__dot:nth-child(1) { animation-delay: -0.32s; }
.thinking-indicator__dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes thinkingDot {
  0%, 80%, 100% { transform: scale(0); opacity: 0.5; }
  40% { transform: scale(1); opacity: 1; }
}

/* ============================================
   5. Layout Components
   ============================================ */

/* App Layout */
.app-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-gradient);
}

/* Sidebar */
.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: var(--glass-bg-strong);
  backdrop-filter: var(--blur-xl);
  border-right: 1px solid var(--border-glass);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-base);
}

.sidebar--collapsed {
  width: 72px;
}

.sidebar__header {
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-glass);
}

.sidebar__content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3);
}

.sidebar__footer {
  padding: var(--space-4);
  border-top: 1px solid var(--border-glass);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Chat Header */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  background: var(--glass-bg-default);
  backdrop-filter: var(--blur-lg);
  border: none;
}

/* Chat Messages */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* Chat Input Area */
.chat-input-area {
  padding: var(--space-4) var(--space-6);
  background: var(--glass-bg-default);
  backdrop-filter: var(--blur-lg);
  border-top: 1px solid var(--border-glass);
}

.chat-input-container {
  display: flex;
  align-items: flex-end;
  gap: var(--space-3);
  max-width: 900px;
  margin: 0 auto;
}

.chat-input-wrapper {
  flex: 1;
  position: relative;
}

/* ============================================
   6. Content Rendering Components
   ============================================ */

/* Markdown Container */
.markdown-container {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--text-primary);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.markdown-container h1,
.markdown-container h2,
.markdown-container h3,
.markdown-container h4 {
  font-weight: var(--font-weight-semibold);
  margin: var(--space-6) 0 var(--space-4);
  color: var(--text-primary);
  line-height: var(--line-height-tight);
}

.markdown-container h1:first-child,
.markdown-container h2:first-child,
.markdown-container h3:first-child,
.markdown-container h4:first-child {
  margin-top: 0;
}

.markdown-container h1 {
  font-size: var(--font-size-2xl);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-default);
}

.markdown-container h2 {
  font-size: var(--font-size-xl);
}

.markdown-container h3 {
  font-size: var(--font-size-lg);
}

.markdown-container h4 {
  font-size: var(--font-size-base);
}

.markdown-container p {
  font-size: var(--font-size-base);
  margin: var(--space-4) 0;
  line-height: var(--line-height-relaxed);
}

.markdown-container p:first-child {
  margin-top: 0;
}

.markdown-container pre {
  background: #000000;
  backdrop-filter: var(--blur-lg);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  overflow-x: auto;
  position: relative;
  font-size: var(--font-size-sm);
}

.markdown-container code {
  font-family: var(--font-family-mono);
  font-size: 0.875em;
}

.markdown-container pre code {
  color: #E2E8F0;
  background: transparent;
  padding: 0;
  font-size: var(--font-size-sm);
}

.markdown-container :not(pre) > code {
  background: rgba(22, 93, 255, 0.10);
  color: var(--color-primary-600);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.875em;
}

.dark-mode .markdown-container :not(pre) > code {
  color: var(--color-primary-300);
}

.markdown-container blockquote {
  border-left: 4px solid var(--color-primary-500);
  background: rgba(22, 93, 255, 0.05);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-4) 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--font-size-base);
  color: var(--text-secondary);
}

.markdown-container ul,
.markdown-container ol {
  font-size: var(--font-size-base);
  margin: var(--space-4) 0;
  padding-left: var(--space-6);
}

.markdown-container li {
  font-size: var(--font-size-base);
  margin: var(--space-2) 0;
  line-height: var(--line-height-relaxed);
}

.markdown-container table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: var(--space-4) 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-default);
  font-size: var(--font-size-sm);
}

.markdown-container th {
  background: var(--glass-bg-subtle);
  font-weight: var(--font-weight-semibold);
  text-align: left;
  padding: var(--space-3);
  border-bottom: 1px solid var(--border-default);
  border-right: 1px solid var(--border-light);
  font-size: var(--font-size-sm);
}

.markdown-container td {
  padding: var(--space-3);
  border-bottom: 1px solid var(--border-light);
  border-right: 1px solid var(--border-light);
  font-size: var(--font-size-sm);
}

.markdown-container th:last-child,
.markdown-container td:last-child {
  border-right: none;
}

.markdown-container th:first-child {
  border-top-left-radius: var(--radius-lg);
}

.markdown-container th:last-child {
  border-top-right-radius: var(--radius-lg);
}

.markdown-container tr:last-child td:first-child {
  border-bottom-left-radius: var(--radius-lg);
}

.markdown-container tr:last-child td:last-child {
  border-bottom-right-radius: var(--radius-lg);
}

.markdown-container tr:hover {
  background: var(--glass-bg-subtle);
}

.markdown-container blockquote {
  border-left: 4px solid var(--color-primary-500);
  background: rgba(22, 93, 255, 0.05);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-4) 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.markdown-container ul,
.markdown-container ol {
  margin: var(--space-4) 0;
  padding-left: var(--space-6);
}

.markdown-container li {
  margin: var(--space-2) 0;
}

/* Code Block with Copy Button */
.code-block {
  position: relative;
}

.code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background: rgba(0, 0, 0, 0.60);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
}

.code-block__copy {
  padding: var(--space-1) var(--space-2);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.20);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.code-block__copy:hover {
  background: rgba(255, 255, 255, 0.10);
  color: white;
}

.code-block pre {
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  margin: 0;
}

/* ============================================
   7. Animation Utilities
   ============================================ */

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

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

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

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

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

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 5px var(--color-primary-400); }
  50% { box-shadow: 0 0 20px var(--color-primary-500), 0 0 30px var(--color-primary-400); }
}

/* Animation Classes */
.animate-fadeIn { animation: fadeIn 0.3s ease; }
.animate-fadeInUp { animation: fadeInUp 0.4s ease; }
.animate-fadeInDown { animation: fadeInDown 0.4s ease; }
.animate-slideInLeft { animation: slideInLeft 0.4s ease; }
.animate-slideInRight { animation: slideInRight 0.4s ease; }
.animate-pulse { animation: pulse 2s infinite; }
.animate-shimmer { animation: shimmer 2s infinite linear; }
.animate-spin { animation: spin 1s linear infinite; }
.animate-bounce { animation: bounce 1s infinite; }
.animate-glow { animation: glow 2s infinite; }

/* ============================================
   8. Utility Classes
   ============================================ */

/* Display */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

/* Spacing */
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.m-1 { margin: var(--space-1); }
.m-2 { margin: var(--space-2); }
.m-3 { margin: var(--space-3); }
.m-4 { margin: var(--space-4); }

/* Text */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }

/* Cursor */
.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

/* Overflow */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-y-auto { overflow-y: auto; }

/* Position */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }

/* Width/Height */
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

/* ============================================
   9. Responsive Design
   ============================================ */

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: var(--z-modal);
    transform: translateX(-100%);
  }
  
  .sidebar--open {
    transform: translateX(0);
  }
  
  .message-bubble {
    max-width: 95%;
  }
  
  .chat-messages {
    padding: var(--space-4);
  }

  /* Markdown Container - 移动端字体自适应 */
  .markdown-container {
    font-size: var(--font-size-sm);
  }

  .markdown-container h1 {
    font-size: var(--font-size-xl);
  }

  .markdown-container h2 {
    font-size: var(--font-size-lg);
  }

  .markdown-container h3 {
    font-size: var(--font-size-base);
  }

  .markdown-container h4 {
    font-size: var(--font-size-sm);
  }

  .markdown-container p {
    font-size: var(--font-size-sm);
  }

  .markdown-container pre {
    font-size: 0.8125rem;
    padding: var(--space-3);
  }

  .markdown-container pre code {
    font-size: 0.8125rem;
  }

  .markdown-container :not(pre) > code {
    font-size: 0.8125em;
  }

  .markdown-container blockquote {
    font-size: var(--font-size-sm);
    padding: var(--space-2) var(--space-3);
  }

  .markdown-container ul,
  .markdown-container ol {
    font-size: var(--font-size-sm);
    padding-left: var(--space-5);
  }

  .markdown-container li {
    font-size: var(--font-size-sm);
  }

  .markdown-container table {
    font-size: 0.8125rem;
  }

  .markdown-container th,
  .markdown-container td {
    font-size: 0.8125rem;
    padding: var(--space-2) var(--space-3);
  }
}

@media (max-width: 480px) {
  /* Markdown Container - 小屏幕进一步调整 */
  .markdown-container {
    font-size: 0.8125rem;
  }

  .markdown-container h1 {
    font-size: var(--font-size-lg);
  }

  .markdown-container h2 {
    font-size: var(--font-size-base);
  }

  .markdown-container h3 {
    font-size: var(--font-size-sm);
  }

  .markdown-container p {
    font-size: 0.8125rem;
  }

  .markdown-container pre {
    font-size: 0.75rem;
    padding: var(--space-2);
  }

  .markdown-container pre code {
    font-size: 0.75rem;
  }

  .markdown-container blockquote {
    font-size: 0.8125rem;
  }

  .markdown-container ul,
  .markdown-container ol {
    font-size: 0.8125rem;
  }

  .markdown-container li {
    font-size: 0.8125rem;
  }

  .markdown-container table {
    font-size: 0.75rem;
  }

  .markdown-container th,
  .markdown-container td {
    font-size: 0.75rem;
    padding: var(--space-1) var(--space-2);
  }
}

/* ============================================
   10. Print Styles
   ============================================ */

@media print {
  .sidebar,
  .chat-input-area,
  .glass-button {
    display: none !important;
  }
  
  .chat-messages {
    overflow: visible;
  }
  
  .message-bubble {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}