/* ============================================================
   Ontology 专题页设计系统
   设计理念: 深色科技风 - 数据智能美学
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a1f2e;
  --bg-card-hover: #1e2640;
  --bg-glass: rgba(26, 35, 60, 0.7);
  --border-subtle: rgba(99, 179, 237, 0.12);
  --border-active: rgba(99, 179, 237, 0.35);
  
  --accent-primary: #3b82f6;
  --accent-secondary: #06b6d4;
  --accent-tertiary: #8b5cf6;
  --accent-glow: rgba(59, 130, 246, 0.25);
  --accent-teal: #14b8a6;
  
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #60a5fa;
  
  --gradient-hero: linear-gradient(135deg, #0a0e17 0%, #1a1f2e 40%, #0f172a 70%, #0a0e17 100%);
  --gradient-card: linear-gradient(145deg, rgba(26, 35, 60, 0.8), rgba(17, 24, 39, 0.9));
  --gradient-accent: linear-gradient(135deg, #3b82f6, #06b6d4);
  --gradient-purple: linear-gradient(135deg, #8b5cf6, #3b82f6);
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.15);
  --shadow-glow-teal: 0 0 40px rgba(6, 182, 212, 0.15);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Layout */
  --max-width: 1200px;
  --nav-height: 64px;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* --- Animated Background --- */
.onto-bg {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: -1;
  background: var(--gradient-hero);
  overflow: hidden;
}

.onto-bg::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: 
    radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 60% 80%, rgba(139, 92, 246, 0.06) 0%, transparent 50%);
  animation: bg-shift 20s ease-in-out infinite;
}

@keyframes bg-shift {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(2%, -1%) rotate(1deg); }
  66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

/* Grid pattern overlay */
.onto-bg::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: 
    linear-gradient(rgba(99, 179, 237, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 179, 237, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

/* --- Navigation --- */
.onto-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  display: flex;
  align-items: center;
}

.onto-nav-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.onto-nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.1rem;
}

.onto-nav-logo .icon {
  width: 32px; height: 32px;
  background: var(--gradient-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.onto-nav-links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.onto-nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.onto-nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--gradient-accent);
  border-radius: 1px;
  transition: width var(--transition-smooth);
}

.onto-nav-links a:hover {
  color: var(--text-primary);
}

.onto-nav-links a:hover::after {
  width: 100%;
}

/* --- Hero Section --- */
.onto-hero {
  padding: calc(var(--nav-height) + var(--space-4xl)) var(--space-xl) var(--space-4xl);
  text-align: center;
  position: relative;
}

.onto-hero-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid var(--border-active);
  border-radius: 20px;
  color: var(--text-accent);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: var(--space-xl);
  animation: fadeInUp 0.6s ease;
}

.onto-hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(135deg, #e2e8f0 0%, #60a5fa 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease 0.1s both;
}

.onto-hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto var(--space-2xl);
  animation: fadeInUp 0.6s ease 0.2s both;
}

.onto-hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.3s both;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-smooth);
  border: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 24px rgba(59, 130, 246, 0.45);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-accent);
  border: 1px solid var(--border-active);
}

.btn-outline:hover {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
}

/* --- Stat Bar --- */
.onto-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-3xl);
  padding: var(--space-2xl) var(--space-xl);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.onto-stat {
  text-align: center;
}

.onto-stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.onto-stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* --- Content Container --- */
.onto-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4xl) var(--space-xl);
}

.onto-section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.onto-section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.onto-section-header p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* --- Card Grid --- */
.onto-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-xl);
}

.onto-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-smooth);
  text-decoration: none;
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
}

.onto-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition-smooth);
}

.onto-card:hover {
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

.onto-card:hover::before {
  opacity: 1;
}

.onto-card-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
}

.onto-card-icon.blue { background: rgba(59, 130, 246, 0.15); color: #60a5fa; }
.onto-card-icon.teal { background: rgba(6, 182, 212, 0.15); color: #22d3ee; }
.onto-card-icon.purple { background: rgba(139, 92, 246, 0.15); color: #a78bfa; }
.onto-card-icon.green { background: rgba(20, 184, 166, 0.15); color: #2dd4bf; }
.onto-card-icon.amber { background: rgba(251, 191, 36, 0.15); color: #fbbf24; }
.onto-card-icon.rose { background: rgba(244, 63, 94, 0.15); color: #fb7185; }
.onto-card-icon.indigo { background: rgba(99, 102, 241, 0.15); color: #818cf8; }

.onto-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.onto-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* --- Feature Section --- */
.onto-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
  padding: var(--space-4xl) var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
}

.onto-feature.reverse {
  direction: rtl;
}

.onto-feature.reverse .onto-feature-content {
  direction: ltr;
}

.onto-feature-image {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-card);
}

.onto-feature-content h3 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.onto-feature-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: var(--space-lg);
}

.onto-feature-content ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.onto-feature-content ul li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-secondary);
}

.onto-feature-content ul li::before {
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  background: var(--accent-primary);
  border-radius: 50%;
  flex-shrink: 0;
}

/* --- Footer --- */
.onto-footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.onto-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.onto-footer a:hover {
  color: var(--text-accent);
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.animate-in {
  animation: fadeInUp 0.6s ease both;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .onto-feature {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .onto-grid {
    grid-template-columns: 1fr;
  }
  
  .onto-stats {
    gap: var(--space-xl);
  }
  
  .onto-hero h1 {
    font-size: 2rem;
  }
  
  .onto-nav-links {
    display: none; /* mobile: hidden, toggle via JS */
  }
}

/* ========== 子页面专用样式 ========== */

/* 面包屑 */
.onto-breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: calc(var(--nav-height) + var(--space-lg)) var(--space-xl) 0;
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.onto-breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.onto-breadcrumb a:hover { color: var(--text-accent); }

.onto-breadcrumb .sep { color: var(--text-muted); }

/* 子页面 Header */
.onto-page-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl) var(--space-3xl);
  text-align: center;
}

.onto-page-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.onto-page-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto;
}

/* 子页面内容区 */
.onto-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl) var(--space-4xl);
}

.onto-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: var(--space-3xl) 0 var(--space-md);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
}

.onto-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: var(--space-xl) 0 var(--space-sm);
  color: var(--text-accent);
}

.onto-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: var(--space-lg) 0 var(--space-xs);
}

.onto-content p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.onto-content ul, .onto-content ol {
  color: var(--text-secondary);
  margin: var(--space-md) 0;
  padding-left: var(--space-xl);
}

.onto-content li {
  margin-bottom: var(--space-xs);
}

/* 表格 */
.onto-table-wrap {
  overflow-x: auto;
  margin: var(--space-lg) 0;
}

.onto-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.onto-table th {
  background: rgba(59, 130, 246, 0.1);
  color: var(--text-accent);
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  font-weight: 600;
  border-bottom: 1px solid var(--border-active);
  white-space: nowrap;
}

.onto-table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.onto-table tr:hover td {
  background: rgba(59, 130, 246, 0.04);
}

/* 代码块 */
.onto-code {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin: var(--space-lg) 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

/* 提示框 */
.onto-callout {
  background: rgba(59, 130, 246, 0.08);
  border-left: 3px solid var(--accent-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
}

.onto-callout p { margin: 0; }

/* 图表容器 */
.onto-diagram {
  text-align: center;
  margin: var(--space-2xl) 0;
}

.onto-diagram img {
  max-width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

/* 子导航 */
.onto-subnav {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
  margin: var(--space-lg) 0;
}

.onto-subnav a {
  padding: var(--space-xs) var(--space-lg);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.onto-subnav a:hover,
.onto-subnav a.active {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--border-active);
  color: var(--text-accent);
}

/* 引用 */
.onto-quote {
  background: var(--gradient-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin: var(--space-2xl) 0;
  text-align: center;
}

.onto-quote blockquote {
  font-size: 1.15rem;
  font-style: italic;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.7;
}

.onto-quote .author {
  margin-top: var(--space-md);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* 返回顶部 */
.onto-back-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  width: 44px; height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.2rem;
  transition: all var(--transition-smooth);
  opacity: 0;
  pointer-events: none;
  z-index: 50;
}

.onto-back-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.onto-back-top:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  color: var(--text-accent);
  transform: translateY(-2px);
}