:root {
  --bg: #07111f;
  --panel: #0c2130;
  --panel-2: #102b38;
  --ink: #f4f8fb;
  --muted: #9db8c2;
  --line: rgba(147, 197, 209, .19);
  --mint: #5eead4;
  --blue: #60a5fa;
  --violet: #a78bfa;
  --amber: #fbbf24;
  --rose: #fb7185;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 80% 8%, rgba(20, 184, 166, .17), transparent 28rem),
    linear-gradient(180deg, #07111f 0, #092431 48%, #071723 100%);
  color: var(--ink);
  font: 16px/1.65 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: inherit; }
.wrap { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.site-nav { display: flex; align-items: center; justify-content: space-between; gap: 22px; padding: 22px 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; letter-spacing: -.02em; }
.brand-dot { width: 14px; height: 14px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 24px rgba(94, 234, 212, .7); }
.nav-links { display: flex; align-items: center; gap: 18px; color: #c4d8de; font-size: 14px; }
.nav-links a { text-decoration: none; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 18px; border: 1px solid rgba(94, 234, 212, .42); border-radius: 999px; background: rgba(94, 234, 212, .1); color: #d9fffa; font-weight: 750; text-decoration: none; }
.button.primary { background: var(--mint); color: #07211e; border-color: transparent; }
.hero { padding: 88px 0 64px; text-align: center; }
.eyebrow, .case-index { color: var(--mint); font-size: 12px; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
h1 { max-width: 920px; margin: 16px auto 20px; font-size: clamp(40px, 7vw, 76px); line-height: 1.04; letter-spacing: -.055em; overflow-wrap: anywhere; }
.hero p { max-width: 760px; margin: 0 auto; color: #b5ccd3; font-size: clamp(17px, 2vw, 21px); }
html[lang="zh-CN"] .hero h1 { max-width: 11em; font-size: clamp(42px, 5.8vw, 68px); line-height: 1.15; letter-spacing: -.04em; text-wrap: balance; }
html[lang="zh-CN"] .hero .headline-line { display: block; }
html[lang="zh-CN"] .hero p { max-width: 40em; line-height: 1.8; text-wrap: pretty; }
.hero-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.trust-strip { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.trust-strip span, .pill { padding: 6px 10px; border: 1px solid var(--line); border-radius: 999px; color: #a9c6cf; background: rgba(8, 31, 43, .7); font-size: 12px; }
.gallery { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; padding: 22px 0 90px; }
.case-card { --accent: var(--mint); grid-column: span 4; min-height: 390px; display: flex; flex-direction: column; padding: 26px; border: 1px solid var(--line); border-radius: 26px; background: linear-gradient(145deg, rgba(15, 44, 57, .96), rgba(9, 29, 42, .96)); box-shadow: 0 24px 60px rgba(0, 0, 0, .18); text-decoration: none; transition: transform .18s ease, border-color .18s ease; }
.case-card:nth-child(4), .case-card:nth-child(5) { grid-column: span 6; }
.case-card:hover, .case-card:focus-visible { transform: translateY(-4px); border-color: var(--accent); outline: none; }
.case-card[data-accent="blue"] { --accent: var(--blue); }
.case-card[data-accent="violet"] { --accent: var(--violet); }
.case-card[data-accent="amber"] { --accent: var(--amber); }
.case-card[data-accent="rose"] { --accent: var(--rose); }
.case-number { display: flex; align-items: center; justify-content: space-between; color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .1em; }
.case-card h2 { margin: 28px 0 8px; font-size: 27px; line-height: 1.15; letter-spacing: -.03em; }
.case-card .question { color: #a8c2ca; }
.decision-preview { margin-top: auto; padding-top: 26px; }
.decision-preview span { color: var(--accent); font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.decision-preview p { margin: 8px 0 0; color: #e2eff2; font-weight: 650; }
.card-arrow { display: inline-block; margin-top: 18px; color: var(--accent); font-weight: 800; }
.method { padding: 70px 0 100px; border-top: 1px solid var(--line); }
.section-head { max-width: 730px; margin-bottom: 34px; }
.section-head h2 { margin: 10px 0; font-size: clamp(32px, 4vw, 48px); line-height: 1.1; letter-spacing: -.04em; }
.section-head p { color: var(--muted); }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.step { padding: 21px; border: 1px solid var(--line); border-radius: 20px; background: rgba(12, 33, 48, .7); }
.step b { color: var(--mint); }
.step p { margin-bottom: 0; color: var(--muted); }
.case-hero { padding: 58px 0 44px; }
.crumbs { color: var(--muted); font-size: 14px; }
.crumbs a { color: #d4e6ea; }
.synthetic-banner { margin: 26px 0; padding: 14px 18px; border: 1px solid rgba(251, 191, 36, .45); border-radius: 14px; background: rgba(120, 75, 5, .22); color: #ffdfa0; font-weight: 700; }
.case-hero h1 { max-width: 980px; margin: 18px 0; font-size: clamp(38px, 6vw, 68px); }
.case-hero .lead { max-width: 820px; color: #b8cdd4; font-size: 20px; }
.case-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.case-layout { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr); gap: 22px; padding-bottom: 90px; }
.stack { display: grid; gap: 18px; }
.panel { padding: 28px; border: 1px solid var(--line); border-radius: 24px; background: rgba(12, 33, 48, .88); }
.panel h2 { margin: 8px 0 12px; font-size: 26px; line-height: 1.2; }
.panel p { color: #c0d3d8; }
.decision-panel { border-color: rgba(94, 234, 212, .42); background: linear-gradient(145deg, rgba(15, 61, 63, .82), rgba(12, 33, 48, .94)); }
.decision-panel h2 { font-size: clamp(27px, 3.2vw, 38px); }
.evidence-list { display: grid; gap: 12px; padding: 0; list-style: none; }
.evidence-list li { position: relative; padding: 14px 15px 14px 46px; border-radius: 14px; background: rgba(148, 197, 209, .07); color: #d5e5e8; }
.evidence-list li::before { content: "✓"; position: absolute; left: 16px; top: 13px; color: var(--mint); font-weight: 900; }
.boundary { border-color: rgba(251, 113, 133, .35); }
.boundary .case-index { color: var(--rose); }
.next-test { border-color: rgba(251, 191, 36, .36); }
.next-test .case-index { color: var(--amber); }
.prompt-box { margin: 14px 0 0; padding: 17px; overflow-wrap: anywhere; border: 1px solid var(--line); border-radius: 14px; background: #061520; color: #d6e7ea; font: 14px/1.65 ui-monospace, SFMono-Regular, Consolas, monospace; }
.side-cta { position: sticky; top: 20px; }
.side-cta h2 { font-size: 25px; }
.side-cta .button { width: 100%; margin-top: 10px; }
.microcopy { color: var(--muted); font-size: 13px; }
footer { padding: 34px 0 52px; border-top: 1px solid var(--line); color: #8eaab3; font-size: 13px; }
.footer-row { display: flex; justify-content: space-between; gap: 24px; }

@media (max-width: 900px) {
  .case-card, .case-card:nth-child(4), .case-card:nth-child(5) { grid-column: span 6; }
  .case-card:last-child { grid-column: 3 / span 8; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .case-layout { grid-template-columns: 1fr; }
  .side-cta { position: static; }
}

@media (max-width: 620px) {
  .wrap { width: min(calc(100% - 28px), var(--max)); }
  .site-nav { align-items: flex-start; }
  .nav-links { flex-direction: column; align-items: flex-end; gap: 6px; }
  .nav-links .button { display: none; }
  .hero { padding-top: 56px; }
  h1 { font-size: 42px; }
  html[lang="zh-CN"] .hero h1 { max-width: none; margin: 18px auto 22px; font-size: 38px; line-height: 1.16; letter-spacing: -.035em; }
  html[lang="zh-CN"] .hero p { max-width: 20em; font-size: 16px; line-height: 1.8; }
  html[lang="zh-CN"] .hero-actions { margin-top: 34px; }
  html[lang="zh-CN"] .trust-strip { gap: 12px; margin-top: 30px; }
  html[lang="zh-CN"] .trust-strip span { padding: 7px 12px; line-height: 1.45; }
  .gallery { grid-template-columns: 1fr; }
  .case-card, .case-card:nth-child(4), .case-card:nth-child(5), .case-card:last-child { grid-column: 1; min-height: 340px; }
  .steps { grid-template-columns: 1fr; }
  .case-layout { gap: 14px; }
  .panel { padding: 22px; }
  .footer-row { display: block; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .case-card { transition: none; }
}