:root {
  --bg: #0c1310;
  --panel: #131b17;
  --line: rgba(255, 255, 255, 0.1);
  --text: #f3f1e9;
  --muted: #aab4a9;
  --gold: #d4a853;
  --jade: #8ab6a3;
}

* { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", sans-serif;
  line-height: 1.75;
}

a { color: inherit; }

.site-head {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 5vw;
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: baseline; gap: .5rem; color: var(--text); text-decoration: none; font-family: "Noto Serif SC", "Songti SC", STSong, serif; font-weight: 700; letter-spacing: .04em; }
.brand-zh { font-size: 1.1rem; }
.brand-en { color: var(--gold); font-size: .85rem; font-weight: 400; letter-spacing: .08em; text-transform: uppercase; }
.site-nav { display: flex; gap: 24px; align-items: center; font-size: 14px; color: var(--muted); }
.site-nav a:hover { color: var(--text); }
.site-nav .language-switch { padding-left: 20px; border-left: 1px solid var(--line); color: var(--gold); font-size: 12px; letter-spacing: .08em; text-decoration: none; }
.site-nav .nav-cta { min-height: 38px; display: inline-flex; align-items: center; gap: 10px; padding: 0 15px; border: 1px solid rgba(212,168,83,.5); color: var(--text); text-decoration: none; }
.site-nav .nav-cta:hover { border-color: var(--gold); }
.site-nav .nav-cta span { color: var(--gold); font-size: 18px; line-height: 1; }

main {
  width: min(920px, calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 96px;
}

.eyebrow { color: var(--jade); font-size: 12px; letter-spacing: .12em; }
h1 { font-family: Georgia, "Songti SC", serif; font-size: clamp(34px, 5vw, 58px); line-height: 1.2; margin: 14px 0 18px; }
.lead { color: var(--muted); font-size: 18px; max-width: 720px; margin-bottom: 48px; }

.content-section { padding: 28px 0; border-top: 1px solid var(--line); }
.content-section h2 { font-size: 20px; margin: 0 0 12px; }
.content-section p, .content-section li { color: var(--muted); }
.content-section ul { padding-left: 20px; }
.content-section strong { color: var(--text); }

.case-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.case-card { border: 1px solid var(--line); background: var(--panel); border-radius: 8px; overflow: hidden; text-decoration: none; }
.case-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; display: block; }
.case-copy { padding: 18px; }
.case-copy h2 { margin: 0 0 7px; font-size: 19px; }
.case-copy p { margin: 0; color: var(--muted); font-size: 14px; }

.guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.guide-card { min-height: 260px; padding: 28px; border: 1px solid var(--line); background: var(--panel); text-decoration: none; display: flex; flex-direction: column; transition: transform .2s ease, border-color .2s ease; }
.guide-card:hover { transform: translateY(-3px); border-color: rgba(212, 168, 83, .55); }
.guide-card > span, .section-label, .guide-problem > span { color: var(--jade); font-size: 11px; letter-spacing: .14em; }
.guide-card h2 { margin: 20px 0 10px; font: 500 25px/1.35 Georgia, "Songti SC", serif; }
.guide-card p { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
.guide-card b { margin-top: auto; color: var(--gold); font-size: 13px; font-weight: 550; }

.guide-detail { display: grid; gap: 76px; }
.guide-problem { padding: 38px 42px; background: var(--panel); border-left: 3px solid var(--gold); }
.guide-problem h2 { margin: 12px 0 16px; max-width: 760px; font: 500 30px/1.42 Georgia, "Songti SC", serif; }
.guide-problem p { max-width: 760px; margin: 0; color: var(--muted); }
.guide-two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; }
.guide-two-column h2 { margin: 12px 0 20px; font: 500 25px/1.4 Georgia, "Songti SC", serif; }
.guide-two-column ul, .guide-two-column ol { margin: 0; padding: 0; list-style: none; counter-reset: guide-step; border-top: 1px solid var(--line); }
.guide-two-column li { padding: 14px 0; color: var(--muted); border-bottom: 1px solid var(--line); }
.guide-two-column ul li::before { content: "○"; color: var(--jade); margin-right: 12px; }
.guide-two-column ol li { counter-increment: guide-step; display: grid; grid-template-columns: 34px 1fr; gap: 8px; }
.guide-two-column ol li::before { content: "0" counter(guide-step); color: var(--gold); }
.guide-example { display: grid; grid-template-columns: 1.15fr .85fr; align-items: stretch; border: 1px solid var(--line); background: var(--panel); }
.guide-example img { width: 100%; height: 100%; min-height: 340px; object-fit: cover; }
.guide-example > div { padding: 42px; align-self: center; }
.guide-example h2 { margin: 12px 0; font: 500 28px/1.35 Georgia, "Songti SC", serif; }
.guide-example p { color: var(--muted); margin: 0 0 24px; }
.guide-faq { border-top: 1px solid var(--line); }
.guide-faq > .section-label { display: block; margin: 28px 0 8px; }
.guide-faq details { border-bottom: 1px solid var(--line); padding: 18px 0; }
.guide-faq summary { cursor: pointer; font-weight: 600; }
.guide-faq p { color: var(--muted); margin: 12px 0 0; max-width: 720px; }
.guide-cta { padding: 42px; text-align: center; border: 1px solid rgba(212, 168, 83, .3); background: linear-gradient(135deg, rgba(212,168,83,.09), rgba(138,182,163,.08)); }
.guide-cta h2 { margin: 0 0 10px; font: 500 30px/1.3 Georgia, "Songti SC", serif; }
.guide-cta p { color: var(--muted); margin: 0 0 24px; }

.empty-state { border: 1px solid var(--line); background: var(--panel); border-radius: 8px; padding: 30px; }
.empty-state h2 { margin-top: 0; }
.empty-state p { color: var(--muted); }

.button {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid rgba(212, 168, 83, .45);
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
}

.button:hover { border-color: var(--gold); }
.button-primary { background: var(--gold); color: #151510; border-color: var(--gold); font-weight: 650; }

.case-detail { margin-top: 12px; }
.case-overview { display: grid; grid-template-columns: minmax(260px, .82fr) minmax(360px, 1.18fr); align-items: stretch; gap: 30px; padding-bottom: 42px; }
.case-overview-copy { display: flex; flex-direction: column; justify-content: center; min-width: 0; }
.case-hero-image { width: 100%; height: 100%; max-height: 410px; aspect-ratio: 16 / 10; object-fit: cover; display: block; border: 1px solid var(--line); }
.case-meta { display: flex; flex-wrap: wrap; gap: 9px; padding: 0 0 24px; color: var(--muted); font-size: 13px; }
.case-meta span { padding: 5px 10px; border: 1px solid var(--line); }
.case-entry-copy { margin: 0; max-width: 460px; color: var(--muted); font-size: 14px; }
.case-story { max-width: 760px; padding: 38px 0 8px; border-top: 1px solid var(--line); }
.case-story h2 { margin: 0 0 14px; font: 500 26px/1.35 Georgia, "Songti SC", serif; }
.case-story p { color: var(--muted); margin: 0; }
.case-story .section-label { display: block; margin-bottom: 12px; }
.case-method { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; padding: 52px 0; border-top: 1px solid var(--line); }
.case-method ul, .case-method ol { list-style: none; padding: 0; margin: 18px 0 0; counter-reset: case-step; }
.case-method li { padding: 12px 0; color: var(--muted); border-bottom: 1px solid var(--line); }
.case-method ul li::before { content: "○"; color: var(--jade); margin-right: 12px; }
.case-method ol li { display: grid; grid-template-columns: 34px 1fr; gap: 8px; counter-increment: case-step; }
.case-method ol li::before { content: "0" counter(case-step); color: var(--gold); }
.case-takeaway { max-width: 760px; padding: 36px 38px; border-left: 3px solid var(--jade); background: var(--panel); }
.case-takeaway p { margin: 12px 0 0; color: var(--text); font: 500 23px/1.7 Georgia, "Songti SC", serif; }
.case-next { margin-top: 56px; padding-top: 38px; border-top: 1px solid var(--line); }
.case-next h2 { margin: 0 0 8px; font: 500 26px/1.4 Georgia, "Songti SC", serif; }
.case-next > p { color: var(--muted); margin: 0; }
.case-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; padding-top: 24px; }
.text-link { color: var(--muted); text-underline-offset: 4px; }

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 28px 5vw;
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
}
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px 20px; }
.footer-links a { color: inherit; text-decoration: none; }
.footer-links a:hover { color: var(--gold); }
.icp-link { color: inherit; text-decoration: none; }
.icp-link:hover { color: var(--gold); }

@media (max-width: 640px) {
  .site-head { min-height: 64px; padding: 12px 20px; }
  .site-nav { gap: 12px; font-size: 12px; }
  .site-nav .language-switch { padding-left: 14px; }
  .site-nav .nav-cta { min-height: 36px; padding: 0 12px; }
  main { padding-top: 48px; }
  .case-grid { grid-template-columns: 1fr; }
  .guide-grid, .guide-two-column, .guide-example { grid-template-columns: 1fr; }
  .guide-detail { gap: 48px; }
  .guide-problem, .guide-example > div, .guide-cta { padding: 28px 24px; }
  .guide-example img { min-height: 230px; }
  .case-overview { grid-template-columns: 1fr; gap: 24px; padding-bottom: 34px; }
  .case-overview-copy { display: contents; }
  .case-meta { order: 1; padding-bottom: 0; }
  .case-entry-copy { order: 2; }
  .case-actions { order: 3; padding-top: 0; }
  .case-hero-image { order: 4; height: auto; max-height: none; }
  .case-story { padding-top: 30px; }
  .case-method { grid-template-columns: 1fr; gap: 36px; }
  .case-takeaway { padding: 28px 24px; }
  .case-takeaway p { font-size: 20px; }
  footer { flex-direction: column; }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 420px) {
  .brand-en, .site-nav .secondary-nav { display: none; }
  .site-nav { gap: 10px; }
  .site-nav .language-switch { padding-left: 10px; }
  .site-nav .nav-cta { padding: 0 10px; }
}