:root {
  color-scheme: light;
  --navy: #17212b;
  --navy-2: #223241;
  --paper: #f6f3eb;
  --white: #ffffff;
  --gold: #c9922e;
  --gold-soft: #f4e5c0;
  --ink: #19232d;
  --muted: #5d6872;
  --line: #d8d5cc;
  --green: #326b58;
  --shadow: 0 18px 50px rgba(23, 33, 43, 0.09);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  line-height: 1.72;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
.skip-link { position: absolute; left: 16px; top: -80px; padding: 10px 14px; background: var(--white); z-index: 20; }
.skip-link:focus { top: 12px; }
.content-width { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.site-header { background: var(--navy); color: var(--white); border-bottom: 1px solid rgba(255,255,255,.12); }
.nav-bar { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; letter-spacing: .02em; }
.brand img { width: 34px; height: 34px; border-radius: 8px; }
.nav-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px 20px; font-size: .94rem; }
.nav-links a { color: #e8edf0; text-decoration: none; }
.nav-links a:hover, .nav-links a:focus-visible { color: #f6d88e; }
.hero { padding: 72px 0 60px; background: linear-gradient(145deg, var(--navy), var(--navy-2)); color: var(--white); }
.breadcrumbs { margin: 0 0 22px; color: #cad2d8; font-size: .9rem; }
.breadcrumbs a { color: #f1d28b; }
.eyebrow { margin: 0 0 12px; color: #f1cd78; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; font-size: .78rem; }
h1 { margin: 0; max-width: 880px; font-size: clamp(2.15rem, 5vw, 4.3rem); line-height: 1.08; letter-spacing: -.04em; }
.lede { max-width: 780px; margin: 22px 0 0; color: #dce3e7; font-size: clamp(1.02rem, 2vw, 1.22rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; min-height: 46px; padding: 10px 18px; border-radius: 999px; border: 1px solid var(--gold); background: var(--gold); color: #1c2630; text-decoration: none; font-weight: 800; }
.button.secondary { background: transparent; color: var(--white); border-color: rgba(255,255,255,.42); }
main section { padding: 64px 0; }
main section + section { border-top: 1px solid var(--line); }
.answer-card { margin-top: -30px; position: relative; background: var(--white); border: 1px solid var(--line); border-left: 5px solid var(--gold); border-radius: var(--radius); padding: 26px 30px; box-shadow: var(--shadow); }
.answer-card strong { display: block; color: var(--green); margin-bottom: 6px; }
.answer-card p { margin: 0; }
.section-head { max-width: 760px; margin-bottom: 28px; }
.section-head h2 { margin: 0 0 10px; font-size: clamp(1.65rem, 3vw, 2.45rem); line-height: 1.2; letter-spacing: -.025em; }
.section-head p { margin: 0; color: var(--muted); }
.grid { display: grid; gap: 18px; }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }
.card { background: rgba(255,255,255,.72); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card h3 { margin: 0 0 8px; font-size: 1.14rem; }
.card p { margin: 0; color: var(--muted); }
.step-number { display: inline-grid; place-items: center; width: 34px; height: 34px; margin-bottom: 14px; border-radius: 50%; background: var(--navy); color: var(--white); font-weight: 800; }
.proof-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: clip; }
.proof-strip div { padding: 20px; background: var(--white); }
.proof-strip strong { display: block; color: var(--navy); font-size: 1.25rem; }
.proof-strip span { color: var(--muted); font-size: .9rem; }
.case-study { background: var(--navy); color: var(--white); }
.case-study .section-head p, .case-study .card p { color: #d3dce1; }
.case-study .card { background: rgba(255,255,255,.07); border-color: rgba(255,255,255,.18); }
.case-study figure { margin: 0; }
.case-study img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 12px; border: 1px solid rgba(255,255,255,.2); }
.case-study figcaption { margin-top: 9px; color: #ccd6dc; font-size: .88rem; }
.prompt-sample { margin-top: 22px; padding: 20px; border-radius: 14px; background: #0e171f; border: 1px solid rgba(255,255,255,.17); color: #e8edf0; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .91rem; white-space: pre-wrap; }
.faq-list { display: grid; gap: 12px; }
.faq-list details { background: var(--white); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; }
.faq-list summary { cursor: pointer; font-weight: 800; }
.faq-list p { margin: 10px 0 0; color: var(--muted); }
.related a { display: block; height: 100%; text-decoration: none; }
.related a:hover, .related a:focus-visible { border-color: var(--gold); box-shadow: 0 8px 26px rgba(23,33,43,.08); }
.related .kicker { color: var(--gold); font-weight: 800; font-size: .8rem; letter-spacing: .08em; }
.site-footer { padding: 30px 0; background: var(--navy); color: #cdd5da; font-size: .9rem; }
.footer-row { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer-row p { margin: 0; }
.footer-row a { color: #f2d083; }
@media (max-width: 820px) {
  .nav-bar { align-items: flex-start; flex-direction: column; padding: 16px 0; }
  .nav-links { justify-content: flex-start; }
  .grid.three, .grid.two, .proof-strip { grid-template-columns: 1fr 1fr; }
  .hero { padding-top: 54px; }
}
@media (max-width: 560px) {
  .content-width { width: min(100% - 26px, 1120px); }
  .grid.three, .grid.two, .proof-strip { grid-template-columns: 1fr; }
  main section { padding: 48px 0; }
  .answer-card { padding: 22px; }
  .nav-links { gap: 8px 14px; font-size: .88rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* Verified case library */
.case-hero h1 { max-width: 980px; }
.case-gallery { display: grid; gap: 18px; align-items: start; }
.case-gallery.three { grid-template-columns: repeat(3, 1fr); }
.case-gallery.one { grid-template-columns: minmax(0, 760px); justify-content: center; }
.case-gallery figure { margin: 0; }
.case-study img.case-evidence { width: 100%; height: auto; max-height: 720px; aspect-ratio: auto; object-fit: contain; background: #0e171f; }
.case-gallery figcaption { margin-top: 9px; color: #ccd6dc; font-size: .9rem; }
.case-output { margin: 0; padding: 22px; border-radius: 14px; background: #0e171f; border: 1px solid rgba(255,255,255,.17); color: #e8edf0; font: .92rem/1.75 ui-monospace, SFMono-Regular, Consolas, monospace; white-space: pre-wrap; overflow-wrap: anywhere; }
.case-output.compact { max-height: 520px; overflow: auto; }
.case-output.light { background: #f7f7f4; border-color: var(--line); color: var(--ink); }
.case-prompt-section { background: var(--navy); color: var(--white); }
.case-prompt-section .section-head p { color: #d3dce1; }
.case-facts { margin: 0; display: grid; gap: 12px; padding-left: 24px; }
.case-facts li { padding-left: 6px; }
.case-index-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.case-card { display: grid; grid-template-columns: minmax(180px, 42%) 1fr; min-height: 290px; overflow: clip; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; box-shadow: 0 10px 28px rgba(23,33,43,.05); }
.case-card:hover, .case-card:focus-visible { border-color: var(--gold); box-shadow: var(--shadow); }
.case-card img { width: 100%; height: 100%; min-height: 290px; object-fit: cover; }
.case-card > div { padding: 24px; align-self: center; }
.case-card h2 { margin: 13px 0 8px; font-size: 1.35rem; line-height: 1.25; }
.case-card p { margin: 0; color: var(--muted); }
.case-chip { display: inline-flex; padding: 5px 10px; border-radius: 999px; background: var(--gold-soft); color: #60440d; font-size: .78rem; font-weight: 800; }
.case-link { display: inline-block; margin-top: 16px; color: var(--green); font-weight: 800; }
@media (max-width: 920px) {
  .case-index-grid { grid-template-columns: 1fr; }
}
@media (max-width: 820px) {
  .case-gallery.three { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .case-card { grid-template-columns: 1fr; }
  .case-card img { min-height: 220px; max-height: 320px; }
}