/* 首页独立编排，沿用共享控件与导航行为。 */
@font-face {
  font-family: Geist;
  src: url('/site-assets/fonts/geist-latin-variable.woff2') format('woff2');
  font-weight: 400 600;
  font-style: normal;
  font-display: swap;
}
:root {
  --page: #fafafa; --surface: #fff; --deep: #f2f2f2;
  --ink: #171717; --ink-2: #454545; --muted: #636363; --faint: #737373;
  --line: #dedede; --divider: var(--line);
  --accent: #171717; --accent-strong: #333; --on-accent: #fff;
  --accent-soft: #ededed; --accent-line: #888;
  --font-sans: Geist, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-display: var(--font-sans);
  --r-sm: 4px; --r-md: 6px; --r-lg: 8px;
  color-scheme: light;
}
:root[data-theme='dark'] {
  --page: #0a0a0a; --surface: #111; --deep: #1b1b1b;
  --ink: #f5f5f5; --ink-2: #c2c2c2; --muted: #a1a1a1; --faint: #999;
  --line: #303030; --divider: var(--line);
  --accent: #ededed; --accent-strong: #ccc; --on-accent: #0a0a0a;
  --accent-soft: #252525; --accent-line: #888;
  color-scheme: dark;
}
.home-page { font-size: 16px; background: var(--page); color: var(--ink); }
.home-page h1, .home-page h2, .home-page h3 { font-weight: 500; }
.home-page h2 { font-size: clamp(26px, 2.6vw, 36px); line-height: 1.2; max-width: 26ch; }
.home-page h3 { font-size: 19px; line-height: 1.35; }
.home-page p { color: var(--ink-2); line-height: 1.65; }
.home-page a { color: var(--ink); }
.home-page .page-shell { width: min(100%, 1248px); margin-inline: auto; padding-inline: 40px; }
.home-page .section { padding-block: 72px; }
.home-page [id] { scroll-margin-top: 96px; }
.home-page .btn { min-height: 44px; padding: 12px 18px; box-shadow: none; font-size: 14px; touch-action: manipulation; }
.home-page .btn-primary { color: var(--on-accent); }
.home-page .btn:hover, .home-page .btn:active { box-shadow: none; transform: none; }
.home-page :focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; }
.home-page .home-note { color: var(--muted); font-size: 13px; }
.home-page .site-header { position: sticky; top: 0; z-index: 100; background: var(--page); border-bottom: 1px solid var(--line); }
.home-page .header-layout { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 32px; }
.home-page .brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.home-page .brand-mark { width: 26px; height: 26px; background: url('/site-assets/brand/mark.svg') center / contain no-repeat; }
.home-page .brand-word { font-size: 19px; font-weight: 600; letter-spacing: -.03em; }
.home-page .nav-links, .home-page .nav-actions { display: flex; align-items: center; gap: 8px; }
.home-page .nav-links { margin-inline: auto; font-size: 14px; }
.home-page .nav-links > a, .home-page .nav-group summary, .home-page .nav-sign-in { padding: 10px; text-decoration: none; white-space: nowrap; color: var(--ink-2); }
.home-page .nav-links a:hover, .home-page .nav-group summary:hover, .home-page .nav-sign-in:hover { color: var(--ink); background: var(--deep); }
.home-page .nav-group { position: relative; }
.home-page .nav-group summary { display: flex; align-items: center; gap: 6px; cursor: pointer; list-style: none; }
.home-page .nav-group summary::-webkit-details-marker { display: none; }
.home-page .nav-chevron { width: 14px; height: 14px; }
.home-page .nav-group[open] .nav-chevron { transform: rotate(180deg); }
.home-page .nav-group-menu { position: absolute; top: 100%; left: 0; display: grid; gap: 2px; min-width: 228px; padding: 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); }
.home-page .nav-group:not([open]) > .nav-group-menu { display: none; }
.home-page .nav-group-menu a { padding: 10px; text-decoration: none; }
.home-page .nav-sign-in { font-size: 14px; }
.home-page .nav-menu-toggle { display: none; flex-shrink: 0; width: 44px; height: 44px; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 6px; }
.home-page .nav-menu-toggle .icon-close { display: none; }
.home-page .site-header.nav-open .icon-menu { display: none; }
.home-page .site-header.nav-open .icon-close { display: block; }
.home-page .lang-picker-btn, .home-page .theme-toggle { width: 40px; height: 40px; }
.home-page .lang-menu { box-shadow: none; }
.home-page .lang-menu-item { font-size: 14px; min-height: 44px; }
.home-page .home-intro { display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 40px; min-height: calc(100svh - 73px); padding-block: clamp(72px, 10svh, 120px); margin-bottom: 64px; }
.home-page .home-intro h1 { font-size: clamp(56px, 6.7vw, 96px); line-height: 1.02; letter-spacing: -.055em; max-width: 100%; text-wrap: balance; }
.home-page .home-intro-action { display: grid; gap: 24px; }
.home-page .home-intro-action > p:first-child { font-size: 20px; max-width: 64ch; }
.home-page .home-actions .btn-primary { min-height: 48px; padding-inline: 24px; font-size: 16px; }
.home-page .home-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 16px 24px; }
.home-page .home-text-link { font-size: 14px; text-underline-offset: 5px; padding-block: 10px; }
.home-page .home-evidence { overflow: hidden; border: 1px solid var(--line); border-radius: 8px; }
.home-page .home-evidence-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding: 16px 20px; background: var(--surface); }
.home-page .home-evidence-head h2 { font-size: 15px; letter-spacing: 0; max-width: none; }
.home-page .home-evidence-head a { font-size: 13px; }
.home-page .home-evidence img { width: 100%; height: auto; }
.home-page figcaption { color: var(--muted); font-size: 13px; line-height: 1.6; }
.home-page .home-evidence figcaption { padding: 14px 20px; border-top: 1px solid var(--line); }
.home-page .home-section-lead { max-width: 70ch; margin-top: 16px; }
.home-page .home-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; margin-top: 36px; }
.home-page .home-steps li { border-top: 1px solid var(--line); padding-top: 22px; }
.home-page .home-steps h3 { margin-bottom: 12px; }
.home-page .home-steps p { font-size: 15px; }
.home-page .home-chain { margin-top: 32px; color: var(--muted); font-size: 14px; }
.home-page .home-product { padding-top: 0; }
.home-page .home-product-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; margin-top: 32px; }
.home-page .home-product-grid img { border: 1px solid var(--line); border-radius: 6px; width: 100%; height: auto; }
.home-page .home-product-grid figcaption { margin-top: 14px; }
.home-page .home-product-grid a { display: block; border-radius: 6px; }
.home-page .extract-band { border-block: 1px solid var(--line); }
.home-page .home-about-heading { display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; margin-bottom: 32px; }
.home-page .home-about-heading p { font-size: 16px; }
.home-page .extract-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 48px; margin: 28px 0; }
.home-page .extract-grid p { margin-top: 10px; font-size: 14px; }
.home-page .home-method, .home-page .disclosure-card, .home-page .faq-list details { border-top: 1px solid var(--line); }
.home-page summary { padding-block: 20px; cursor: pointer; color: var(--ink); }
.home-page summary h3 { display: inline; font-size: 16px; }
.home-page .disclosure-content { padding-bottom: 24px; }
.home-page .disclosure-content p { margin-block: 12px; font-size: 14px; }
.home-page .extract-steps { padding-left: 20px; list-style: decimal; font-size: 15px; color: var(--ink-2); }
.home-page .extract-steps li + li { margin-top: 8px; }
.home-page .home-sources { margin-top: 32px; padding-top: 28px; border-top: 1px solid var(--line); }
.home-page .home-sources figure { max-width: 70ch; margin: 24px 0; }
.home-page .home-sources blockquote { margin: 12px 0; padding-inline-start: 20px; border-inline-start: 2px solid var(--line); }
.home-page .home-sources cite { font-style: normal; }
.home-page .home-sources a { text-underline-offset: 3px; }
.home-page .ribbon-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; margin-block: 24px; }
.home-page .model-ribbon-card { display: grid; gap: 4px; font-size: 14px; }
.home-page .model-ribbon-badge { color: var(--muted); font-size: 13px; }
.home-page .pricing-head { display: grid; gap: 24px; margin-bottom: 28px; }
.home-page .section-heading > p { margin-top: 16px; max-width: 70ch; }
.home-page .billing-toggle { width: fit-content; }
.home-page .seg-opt { min-height: 44px; font-size: 14px; padding: 10px 16px; }
.home-page .seg-opt.is-active { color: var(--on-accent); background: var(--accent); }
.home-page .pricing-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.home-page .price-card { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; padding: 26px 20px; min-width: 0; background: var(--surface); }
.home-page .price-card + .price-card { border-left: 1px solid var(--line); }
.home-page .price-card-featured { background: var(--deep); }
.home-page .plan-name { font-size: 16px; font-weight: 500; color: var(--ink); }
.home-page .price { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; font-variant-numeric: tabular-nums; }
.home-page .price strong { font-size: 36px; font-weight: 500; line-height: 1.2; letter-spacing: -.04em; color: var(--ink); }
.home-page .price span { font-size: 13px; color: var(--muted); }
.home-page .plan-summary { min-height: 64px; font-size: 14px; }
.home-page .price-card ul { display: grid; gap: 12px; margin-bottom: 12px; font-size: 14px; color: var(--ink-2); }
.home-page .price-card .btn { margin-top: auto; width: 100%; padding-inline: 8px; }
.home-page .pricing-note { margin-top: 20px; font-size: 13px; color: var(--muted); }
.home-page .faq { padding-top: 0; }
.home-page .faq > .page-shell { display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; }
.home-page .faq-list summary { font-size: 16px; font-weight: 500; }
.home-page .faq-list p { padding-bottom: 24px; font-size: 15px; }
.home-page .home-tools { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 36px; margin-top: 32px; }
.home-page .home-tool { display: flex; flex-direction: column; align-items: flex-start; gap: 16px; border-top: 1px solid var(--line); padding-top: 24px; }
.home-page .home-tool p { font-size: 15px; }
.home-page .home-tool .btn { margin-top: auto; }
.home-page .blog-band { padding-top: 0; }
.home-page .blog-preview-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 40px; margin-top: 32px; }
.home-page .blog-preview-card { text-decoration: none; padding-block: 22px; border-top: 1px solid var(--line); }
.home-page .blog-preview-card h3 { font-size: 17px; margin-top: 8px; }
.home-page .blog-preview-card p { margin-top: 10px; font-size: 14px; }
.home-page .blog-preview-kicker { font-size: 13px; color: var(--muted); }
.home-page .blog-preview-card:hover h3 { text-decoration: underline; text-underline-offset: 4px; }
.home-page .blog-preview-more { margin-top: 12px; font-size: 14px; }
.home-page .home-final { border-block: 1px solid var(--line); padding-block: 56px; }
.home-page .home-final-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.home-page .home-final p { margin-top: 16px; max-width: 58ch; }
.home-page .site-footer { padding-block: 40px; }
.home-page .footer-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; }
.home-page .footer-tagline, .home-page .footer-byline, .home-page .footer-copy { margin-top: 14px; font-size: 13px; }
.home-page .footer-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); align-content: start; gap: 16px; font-size: 13px; }
.home-page .footer-links a { text-decoration: none; }
.home-page .footer-links a:hover { text-decoration: underline; }
@media (max-width: 1120px) {
  .home-page .header-layout { gap: 16px; }
  .home-page .nav-menu-toggle { display: flex; order: 3; }
  .home-page .nav-actions { margin-left: auto; }
  .home-page .nav-links { display: none; }
  .home-page .site-header.nav-open .nav-links { display: flex; position: absolute; top: 100%; inset-inline: 0; flex-direction: column; align-items: stretch; background: var(--surface); border-bottom: 1px solid var(--line); padding: 16px 24px; max-height: calc(100dvh - 72px); overflow-y: auto; overscroll-behavior: contain; }
  .home-page .nav-group-menu { position: static; border: 0; padding-left: 20px; }
  .home-page .pricing-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .home-page .price-card:nth-child(3) { border-left: 0; }
  .home-page .price-card:nth-child(n+3) { border-top: 1px solid var(--line); }
}
@media (max-width: 720px) {
  .home-page .page-shell { padding-inline: 20px; }
  .home-page .section { padding-block: 48px; }
  .home-page .header-layout { gap: 8px; }
  .home-page .nav-sign-in, .home-page .theme-toggle, .home-page .nav-cta { display: none; }
  .home-page .nav-actions { gap: 6px; }
  .home-page .brand-word { font-size: 17px; }
  .home-page .brand-mark { width: 22px; height: 22px; }
  .home-page .home-intro { gap: 28px; padding-block: 40px; margin-bottom: 40px; }
  .home-page .home-intro h1 { font-size: clamp(36px, 10.8vw, 52px); }
  .home-page .home-intro-action > p:first-child { font-size: 16px; }
  .home-page .home-intro-action { gap: 14px; }
  .home-page .home-actions { gap: 8px 18px; }
  .home-page .home-evidence-head, .home-page .home-evidence figcaption { padding: 12px; }
  .home-page .home-steps, .home-page .home-tools { grid-template-columns: 1fr; gap: 24px; margin-top: 24px; }
  .home-page .home-product { padding-top: 0; }
  .home-page .home-product-grid { grid-template-columns: 1fr; gap: 28px; }
  .home-page .home-about-heading, .home-page .faq > .page-shell { grid-template-columns: 1fr; gap: 24px; }
  .home-page .extract-grid { grid-template-columns: 1fr; gap: 24px; }
  .home-page .ribbon-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .home-page .pricing-grid { grid-template-columns: 1fr; }
  .home-page .price-card + .price-card { border-left: 0; border-top: 1px solid var(--line); }
  .home-page .plan-summary { min-height: 0; }
  .home-page .price-card { padding: 24px; }
  .home-page .faq { padding-top: 0; }
  .home-page .blog-band { padding-top: 0; }
  .home-page .blog-preview-grid { grid-template-columns: 1fr; }
  .home-page .home-final-inner { flex-direction: column; align-items: flex-start; gap: 24px; }
  .home-page .footer-layout { grid-template-columns: 1fr; gap: 28px; }
  .home-page .footer-links { gap: 16px 12px; }
}