/* ============================================================
   AI Benchmark Hub — main stylesheet
   纯手写CSS，无外部框架依赖
   ============================================================ */

/* ---------- 1. CSS Reset & 全局变量 ---------- */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-bg: #ffffff;
  --color-fg: #1f2937;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-card-bg: #f9fafb;
  --color-header-bg: #ffffff;
  --color-footer-bg: #f3f4f6;
  --max-width: 1200px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-mono: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.08);
  --header-height: 60px;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-fg);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  font-weight: 600;
  line-height: 1.25;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; }

p { margin: 0 0 1em; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { text-decoration: underline; color: var(--color-primary-dark); }

img { max-width: 100%; height: auto; }

ul, ol { margin: 0 0 1em; padding-left: 1.5em; }

small, .small { font-size: 0.85rem; color: var(--color-muted); }
.muted { color: var(--color-muted); }

/* ---------- 2. Layout 容器 ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.main-content {
  padding-top: 32px;
  padding-bottom: 64px;
  min-height: calc(100vh - var(--header-height) - 200px);
}

.layout-two-col {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}

.layout-two-col .main-col { min-width: 0; }
.layout-two-col .side-col {
  position: sticky;
  top: calc(var(--header-height) + 16px);
}

/* ---------- 3. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-header-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: var(--header-height);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-fg);
  font-weight: 700;
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-name {
  font-size: 1.15rem;
  color: var(--color-fg);
}

.main-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
  flex: 1;
  justify-content: center;
}

.main-nav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-fg);
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.15s ease, color 0.15s ease;
}
.main-nav a:hover {
  background: var(--color-card-bg);
  text-decoration: none;
}
.main-nav a.active {
  color: var(--color-primary);
  font-weight: 600;
  background: rgba(37, 99, 235, 0.08);
}

.lang-switcher {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.lang-link {
  padding: 4px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--color-fg);
  transition: all 0.15s ease;
}
.lang-link:hover { text-decoration: none; border-color: var(--color-primary); color: var(--color-primary); }
.lang-link.current {
  background: var(--color-fg);
  color: var(--color-bg);
  border-color: var(--color-fg);
  cursor: default;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 22px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 3px;
  background: var(--color-fg);
  border-radius: 2px;
  transition: transform 0.2s ease;
}

/* ---------- 4. Footer ---------- */
.site-footer {
  background: var(--color-footer-bg);
  border-top: 1px solid var(--color-border);
  padding: 32px 0 20px;
  margin-top: 60px;
}

.footer-inner { padding: 0 20px; max-width: var(--max-width); margin: 0 auto; }

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 16px;
}

.footer-brand {
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 0 8px;
  color: var(--color-fg);
}

.footer-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--color-fg);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-links li { margin-bottom: 6px; }
.footer-links a { font-size: 0.9rem; color: var(--color-muted); }
.footer-links a:hover { color: var(--color-primary); }

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-bottom .small { margin: 0; }

.trademark-notice { line-height: 1.5; }
.copyright { text-align: right; }

/* ---------- 5. Hero ---------- */
.hero {
  text-align: center;
  padding: 60px 0 40px;
  background: linear-gradient(180deg, var(--color-card-bg) 0%, var(--color-bg) 100%);
  margin-bottom: 32px;
  border-radius: var(--radius-lg);
}
.hero-title { font-size: 2.5rem; margin-bottom: 16px; }
.hero-sub { color: var(--color-muted); font-size: 1.1rem; max-width: 640px; margin: 0 auto 24px; }
.hero-search {
  display: flex;
  gap: 8px;
  max-width: 480px;
  margin: 0 auto;
  justify-content: center;
}
.hero-search input[type="search"] {
  flex: 1;
  padding: 10px 14px;
  font-size: 0.95rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-fg);
}
.hero-search button {
  padding: 10px 20px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
}
.hero-search button:disabled { cursor: not-allowed; opacity: 0.6; }
.hero-search input:disabled { background: var(--color-card-bg); cursor: not-allowed; }
.hero-search-hint { margin-top: 12px; }

/* ---------- 6. Section & Cards ---------- */
.section {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}
.section:first-of-type { border-top: none; }

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 8px;
}
.section-header h2 { margin: 0; }
.section-link { font-size: 0.9rem; }

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.benchmark-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.model-card-link,
.benchmark-card-link {
  display: block;
  padding: 18px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.15s ease;
  color: var(--color-fg);
}
.model-card-link:hover,
.benchmark-card-link:hover {
  text-decoration: none;
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.model-card-title { margin: 0 0 6px; color: var(--color-primary); font-size: 1.1rem; }
.benchmark-card-id { margin: 0 0 6px; color: var(--color-primary); font-size: 1.1rem; }
.benchmark-card-name { margin: 0 0 8px; color: var(--color-fg); font-size: 0.9rem; }
.benchmark-card-desc { margin: 8px 0 0; }

.vendor { color: var(--color-muted); font-size: 0.9rem; margin: 0 0 6px; }
.model-card-score { margin: 4px 0; font-size: 0.9rem; }
.model-card-price { margin: 6px 0 0; font-size: 0.85rem; color: var(--color-muted); }
.model-card-context,
.model-card-license { margin: 4px 0; font-size: 0.9rem; }
.model-card-link {
  display: inline-block;
  margin-top: 8px;
  font-weight: 500;
  font-size: 0.9rem;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin-right: 4px;
}
.badge-tie { background: rgba(245, 158, 11, 0.15); color: var(--color-warning); }

/* ---------- 7. Page Header ---------- */
.page-header { margin-bottom: 24px; }
.breadcrumb { color: var(--color-muted); margin-bottom: 8px; }
.breadcrumb a { color: var(--color-muted); }
.breadcrumb a:hover { color: var(--color-primary); }
.page-title { font-size: 1.8rem; margin: 0 0 8px; }
.page-description { color: var(--color-muted); margin: 0 0 8px; }
.page-meta { margin: 0; }
.model-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0;
}

/* ---------- 8. Tables ---------- */
.section-block {
  margin-bottom: 32px;
  padding: 0;
}
.section-block h2 {
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 16px;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  background: var(--color-bg);
}
.data-table th,
.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}
.data-table thead th {
  background: var(--color-card-bg);
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}
.data-table tbody tr:nth-child(even) { background: var(--color-card-bg); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table th { white-space: nowrap; }

.comparison-table-data { font-size: 0.95rem; }
.comparison-table-data th { text-align: center; }
.comparison-table-data td { text-align: center; }
.comparison-table-data td:first-child { text-align: left; font-weight: 500; }
.comparison-table-data .winner { color: var(--color-secondary); }

.ranking-table tbody tr.rank-first { background: rgba(16, 185, 129, 0.08); }
.ranking-table .rank-first td { font-weight: 600; }

/* ---------- 9. Comparison Page ---------- */
.comparison-page .layout-two-col { margin-top: 0; }

.comparison-list { list-style: none; padding: 0; margin: 0; }
.comparison-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}
.comparison-list li:last-child { border-bottom: none; }
.comparison-list-title {
  display: block;
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 4px;
}
.comparison-list-meta { margin: 0 0 4px; }
.comparison-list-verdict { margin: 4px 0 0; line-height: 1.5; }

.comparison-cards li {
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  background: var(--color-card-bg);
}

.editorial-verdict { background: rgba(245, 158, 11, 0.05); padding: 16px; border-radius: var(--radius-md); border-left: 4px solid var(--color-warning); }
.editorial-verdict h2 { border-bottom: none; padding-bottom: 0; }
.verdict-quote {
  margin: 0;
  padding: 8px 0;
  font-style: italic;
  font-size: 1.05rem;
  color: var(--color-fg);
  border-left: none;
}

/* ---------- 10. FAQ ---------- */
.faq-section .faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 8px;
  background: var(--color-bg);
  overflow: hidden;
}
.faq-question {
  padding: 12px 16px;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-fg);
  list-style: none;
  display: block;
  user-select: none;
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::before {
  content: "▸";
  display: inline-block;
  margin-right: 8px;
  color: var(--color-primary);
  transition: transform 0.15s ease;
}
.faq-item[open] .faq-question::before { transform: rotate(90deg); }
.faq-answer {
  padding: 0 16px 12px 16px;
  color: var(--color-fg);
  line-height: 1.6;
}

/* ---------- 11. Sidebar ---------- */
.sidebar-card {
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-card-bg);
  margin-bottom: 16px;
}
.sidebar-card h3 {
  margin: 0 0 12px;
  font-size: 1rem;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}
.sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sidebar-list li { padding: 4px 0; font-size: 0.9rem; }
.sidebar-list-item { margin: 0 0 6px; font-size: 0.9rem; }

/* ---------- 12. Model Page ---------- */
.model-page .page-header .model-meta { margin: 12px 0; }
.compliance-list { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 8px; }
.compliance-list li {
  padding: 8px 12px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
}

.source { margin-top: 8px; }
.source-list { padding-left: 1.2em; }
.source-list li { margin-bottom: 4px; }

/* ---------- 13. Chart Figure ---------- */
.chart-figure {
  margin: 24px 0;
  text-align: center;
  padding: 16px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.chart-figure img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}
.chart-figure figcaption {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* ---------- 14. Prose / Markdown content ---------- */
.prose { line-height: 1.7; }
.prose h1, .prose h2, .prose h3, .prose h4 { color: var(--color-fg); }
.prose h2 { margin-top: 1.8em; padding-bottom: 6px; border-bottom: 1px solid var(--color-border); }
.prose h3 { margin-top: 1.4em; }
.prose p { margin: 0 0 1em; }
.prose ul, .prose ol { margin: 0 0 1em; padding-left: 1.5em; }
.prose li { margin-bottom: 4px; }
.prose blockquote {
  margin: 1em 0;
  padding: 8px 16px;
  border-left: 4px solid var(--color-primary);
  background: var(--color-card-bg);
  color: var(--color-muted);
}
.prose code {
  font-family: var(--font-mono);
  background: var(--color-card-bg);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}
.prose pre {
  background: var(--color-card-bg);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  border: 1px solid var(--color-border);
}
.prose pre code { background: none; padding: 0; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  display: block;
  overflow-x: auto;
}
.prose th, .prose td { padding: 8px 12px; border: 1px solid var(--color-border); text-align: left; }
.prose th { background: var(--color-card-bg); font-weight: 600; }
.prose a { color: var(--color-primary); }

/* ---------- 15. Warnings ---------- */
.warn {
  display: block;
  background: #fef3c7;
  color: #92400e;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-warning);
  font-size: 0.9rem;
  margin: 12px 0;
}

/* ---------- 16. Responsive ---------- */
@media (max-width: 1024px) {
  .layout-two-col {
    grid-template-columns: 1fr;
  }
  .layout-two-col .side-col { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .header-inner { flex-wrap: wrap; gap: 8px; padding: 10px 16px; }

  .nav-toggle { display: flex; order: 3; }
  .main-nav {
    display: none;
    order: 4;
    flex-direction: column;
    flex: 1 1 100%;
    align-items: stretch;
    width: 100%;
    padding-top: 8px;
  }
  .main-nav.open { display: flex; }
  .main-nav a {
    padding: 10px 12px;
    border-radius: var(--radius-sm);
  }

  .brand { font-size: 1rem; }
  .brand-name { font-size: 1rem; }

  .lang-switcher { order: 2; }

  .hero { padding: 40px 16px; }
  .hero-title { font-size: 1.8rem; }
  .hero-sub { font-size: 1rem; }
  .hero-search { flex-direction: column; max-width: 100%; }
  .hero-search button { width: 100%; }

  .model-grid,
  .benchmark-grid {
    grid-template-columns: 1fr;
  }

  .page-title { font-size: 1.5rem; }
  h2 { font-size: 1.3rem; }

  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .copyright { text-align: left; }

  .container { padding: 0 16px; }

  .compliance-list { grid-template-columns: 1fr; }

  .comparison-table-data { font-size: 0.85rem; }
  .data-table th, .data-table td { padding: 8px 10px; }
}

@media (max-width: 480px) {
  .brand-name { display: none; }
  .brand-mark { width: 32px; height: 32px; font-size: 0.75rem; }
  .hero-title { font-size: 1.5rem; }
}

/* ---------- 17. Dark Mode ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #60a5fa;
    --color-primary-dark: #93c5fd;
    --color-secondary: #34d399;
    --color-warning: #fbbf24;
    --color-danger: #f87171;
    --color-bg: #0f172a;
    --color-fg: #e2e8f0;
    --color-muted: #94a3b8;
    --color-border: #334155;
    --color-card-bg: #1e293b;
    --color-header-bg: #0f172a;
    --color-footer-bg: #1e293b;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  }

  body { -webkit-font-smoothing: auto; }

  .badge {
    background: rgba(96, 165, 250, 0.15);
    color: var(--color-primary);
  }
  .badge-tie { background: rgba(251, 191, 36, 0.2); color: var(--color-warning); }
  .ranking-table tbody tr.rank-first { background: rgba(52, 211, 153, 0.1); }

  .warn { background: rgba(251, 191, 36, 0.15); color: var(--color-warning); }

  .main-nav a.active { background: rgba(96, 165, 250, 0.15); }

  .hero { background: linear-gradient(180deg, var(--color-card-bg) 0%, var(--color-bg) 100%); }

  .lang-link.current { background: var(--color-fg); color: var(--color-bg); border-color: var(--color-fg); }

  .prose code { background: var(--color-card-bg); }
  .prose pre { background: var(--color-card-bg); border-color: var(--color-border); }

  /* CJK 字体在深色模式下保持 */
  html[lang^="zh"], html[lang^="ja"], html[lang^="ko"] {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  }
}

/* ---------- 18. Print ---------- */
@media print {
  .site-header, .site-footer, .lang-switcher, .nav-toggle, .sidebar-card { display: none; }
  .layout-two-col { grid-template-columns: 1fr; }
  .container { max-width: 100%; }
  body { color: #000; background: #fff; }
  a { color: #000; text-decoration: underline; }
}

/* ---------- 19. Utilities & CJK font ---------- */
html[lang^="zh"], html[lang^="ja"], html[lang^="ko"] {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

.list-page .list-intro { margin-bottom: 24px; }
.list-intro p:last-child { margin-bottom: 0; }

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  z-index: 200;
  border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus { left: 0; }