@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Noto+Sans+SC:wght@400;500;700;900&family=Noto+Serif+SC:wght@500;700;900&display=swap');

:root {
  --ink: #17211f;
  --ink-soft: #53615d;
  --paper: #f2eee5;
  --paper-deep: #e4ded1;
  --line: rgba(23, 33, 31, .18);
  --orange: #bd542e;
  --orange-dark: #873b26;
  --cyan: #9ed9d0;
  --yellow: #e6bb5b;
  --white: #faf8f2;
  --display: 'Noto Serif SC', Georgia, serif;
  --body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'DM Mono', 'SFMono-Regular', Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font: 15px/1.7 var(--body); }
body::before { content: ''; position: fixed; inset: 0; z-index: 20; pointer-events: none; opacity: .2; mix-blend-mode: multiply; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.16'/%3E%3C/svg%3E"); }
a { color: inherit; }
button { font: inherit; }
.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; color: var(--orange); font: 500 11px/1 var(--mono); letter-spacing: .13em; text-transform: uppercase; }
.eyebrow::before { content: ''; width: 25px; height: 1px; background: currentColor; }
.site-header { color: var(--white); background: var(--ink); }
.nav { display: flex; justify-content: space-between; align-items: center; min-height: 82px; border-bottom: 1px solid rgba(250,248,242,.2); }
.brand { display: flex; align-items: center; gap: 13px; color: var(--white); text-decoration: none; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; color: var(--ink); background: var(--cyan); border-radius: 50%; font: 500 14px/1 var(--mono); }
.brand-copy { display: grid; gap: 2px; }
.brand-copy strong { font: 500 14px/1 var(--mono); letter-spacing: .09em; }
.brand-copy span { color: rgba(250,248,242,.55); font: 10px/1 var(--mono); letter-spacing: .13em; }
.nav-links { display: flex; gap: 25px; align-items: center; }
.nav-links a { color: rgba(250,248,242,.68); font-size: 13px; text-decoration: none; transition: color .2s ease; }
.nav-links a:hover, .nav-links a.is-current { color: var(--cyan); }
.nav-code { color: var(--cyan); font: 500 11px var(--mono); }
.page-hero { position: relative; overflow: hidden; color: var(--white); background: var(--ink); }
.page-hero::after { content: ''; position: absolute; width: 370px; height: 370px; right: -85px; bottom: -210px; border: 1px solid rgba(158,217,208,.35); border-radius: 50%; box-shadow: 0 0 0 25px rgba(158,217,208,.06), 0 0 0 70px rgba(158,217,208,.04); }
.page-hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: 70px; align-items: end; padding: 104px 0 80px; }
.page-hero .eyebrow { color: var(--cyan); }
.page-hero h1 { max-width: 760px; margin: 22px 0 22px; font: 900 clamp(52px, 8vw, 104px)/.98 var(--display); letter-spacing: -.1em; }
.page-hero h1 em { color: var(--yellow); font-style: normal; }
.page-hero-lede { max-width: 600px; margin: 0; color: rgba(250,248,242,.68); font-size: 17px; }
.hero-index { padding: 18px 0 0 22px; border-left: 1px solid var(--cyan); color: rgba(250,248,242,.6); font-size: 13px; }
.hero-index strong { display: block; margin-bottom: 10px; color: var(--cyan); font: 500 11px var(--mono); letter-spacing: .1em; }
.crumb { padding: 14px 0; color: rgba(250,248,242,.5); border-bottom: 1px solid rgba(250,248,242,.16); font: 500 10px var(--mono); letter-spacing: .07em; }
.crumb a { color: var(--cyan); text-decoration: none; }
.section { padding: 100px 0 115px; }
.section-deep { background: var(--paper-deep); }
.section-dark { color: var(--white); background: var(--ink); }
.section-orange { color: var(--white); background: var(--orange-dark); }
.section-heading { display: grid; grid-template-columns: 1fr .65fr; gap: 65px; align-items: end; margin-bottom: 48px; }
.section-heading h2 { margin: 16px 0 0; font: 900 clamp(38px, 5.5vw, 72px)/1.02 var(--display); letter-spacing: -.08em; }
.section-heading p { margin: 0; color: var(--ink-soft); font-size: 14px; }
.section-dark .section-heading p, .section-orange .section-heading p { color: rgba(250,248,242,.62); }
.section-dark .eyebrow { color: var(--cyan); }
.section-orange .eyebrow { color: var(--yellow); }
.filter-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 27px; }
.filter-button { padding: 9px 15px; color: var(--ink-soft); border: 1px solid var(--line); border-radius: 999px; background: transparent; cursor: pointer; transition: .2s ease; }
.filter-button:hover, .filter-button.is-active { color: var(--white); border-color: var(--ink); background: var(--ink); }
.section-dark .filter-button { color: rgba(250,248,242,.66); border-color: rgba(250,248,242,.22); }
.section-dark .filter-button:hover, .section-dark .filter-button.is-active { color: var(--ink); border-color: var(--cyan); background: var(--cyan); }
.specimen-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.specimen-card { position: relative; min-height: 318px; display: flex; flex-direction: column; justify-content: space-between; padding: 23px; color: var(--white); background: var(--orange); overflow: hidden; }
.specimen-card:nth-child(3n+2) { color: var(--ink); background: var(--cyan); }
.specimen-card:nth-child(3n) { background: #596b58; }
.specimen-card:nth-child(4n) { color: var(--ink); background: var(--yellow); }
.specimen-card:nth-child(5n) { background: #716f83; }
.specimen-card:nth-child(6n) { color: var(--ink); background: #d0b8a7; }
.specimen-card::after { content: ''; position: absolute; width: 190px; height: 190px; right: -60px; bottom: -68px; border: 1px solid currentColor; border-radius: 50%; opacity: .22; box-shadow: 0 0 0 24px currentColor; }
.specimen-card.is-hidden { display: none; }
.specimen-top { position: relative; z-index: 1; display: flex; justify-content: space-between; gap: 12px; font: 500 10px var(--mono); letter-spacing: .07em; }
.specimen-card h3 { position: relative; z-index: 1; max-width: 260px; margin: auto 0 5px; font: 900 29px/1.05 var(--display); letter-spacing: -.07em; }
.specimen-card h3 small { display: block; margin-top: 8px; font: 500 11px var(--mono); letter-spacing: .02em; opacity: .7; }
.specimen-card p { position: relative; z-index: 1; max-width: 260px; margin: 0; font-size: 13px; opacity: .78; }
.specimen-meta { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 6px; margin-top: 17px; }
.specimen-meta span { padding: 4px 7px; border: 1px solid currentColor; border-radius: 2px; font: 500 9px var(--mono); opacity: .72; }
.directory-note { display: flex; gap: 18px; margin-top: 28px; padding: 17px 0 0; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 12px; }
.directory-note b { color: var(--orange); font: 500 12px var(--mono); }
.route-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; }
.route-card { min-height: 230px; display: flex; flex-direction: column; justify-content: space-between; padding: 22px; color: var(--white); background: rgba(250,248,242,.06); border: 1px solid rgba(250,248,242,.17); text-decoration: none; transition: transform .2s ease, border-color .2s ease; }
.route-card:hover { transform: translateY(-4px); border-color: var(--cyan); }
.route-card span { color: var(--cyan); font: 500 10px var(--mono); letter-spacing: .08em; }
.route-card h3 { margin: 28px 0 8px; font: 700 23px/1.2 var(--display); }
.route-card p { margin: 0; color: rgba(250,248,242,.6); font-size: 13px; }
.route-card i { align-self: flex-end; color: var(--yellow); font-style: normal; font-size: 22px; }
.clock { position: relative; display: grid; gap: 0; border-top: 1px solid rgba(250,248,242,.25); }
.clock-row { display: grid; grid-template-columns: 170px 1fr 190px; gap: 30px; padding: 28px 0; border-bottom: 1px solid rgba(250,248,242,.18); }
.clock-date { color: var(--yellow); font: 500 13px var(--mono); }
.clock-row h3 { margin: 0 0 7px; font: 700 25px/1.2 var(--display); }
.clock-row p { max-width: 580px; margin: 0; color: rgba(250,248,242,.62); font-size: 14px; }
.clock-index { color: rgba(250,248,242,.2); text-align: right; font: 500 48px var(--mono); }
.milestone-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.milestone { padding: 25px; border: 1px solid var(--line); background: rgba(250,248,242,.4); }
.milestone b { color: var(--orange); font: 500 12px var(--mono); }
.milestone h3 { margin: 22px 0 8px; font: 700 23px/1.2 var(--display); }
.milestone p { margin: 0; color: var(--ink-soft); font-size: 13px; }
.lab-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 85px; align-items: start; }
.lab-aside { position: sticky; top: 30px; }
.lab-aside h2 { margin: 16px 0 18px; font: 900 clamp(39px, 5vw, 68px)/1.02 var(--display); letter-spacing: -.09em; }
.lab-aside p { margin: 0; color: var(--ink-soft); font-size: 14px; }
.lab-steps { border-top: 1px solid var(--line); }
.lab-step { display: grid; grid-template-columns: 80px 1fr; gap: 22px; padding: 24px 0 28px; border-bottom: 1px solid var(--line); }
.lab-step-no { color: var(--orange); font: 500 13px var(--mono); }
.lab-step h3 { margin: 0 0 6px; font: 700 24px/1.2 var(--display); }
.lab-step p { margin: 0; color: var(--ink-soft); font-size: 14px; }
.lab-step-tag { display: inline-block; margin-top: 12px; color: var(--orange-dark); font: 500 10px var(--mono); letter-spacing: .08em; }
.evidence-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; }
.evidence-card { min-height: 245px; padding: 22px; border-top: 2px solid var(--cyan); background: rgba(250,248,242,.055); }
.evidence-card b { color: var(--cyan); font: 500 11px var(--mono); }
.evidence-card h3 { margin: 30px 0 8px; font: 700 23px/1.2 var(--display); }
.evidence-card p { margin: 0; color: rgba(250,248,242,.6); font-size: 13px; }
.china-intro { display: grid; grid-template-columns: .9fr 1.1fr; gap: 75px; align-items: end; }
.china-intro h2 { margin: 15px 0 0; font: 900 clamp(42px, 6vw, 78px)/1 var(--display); letter-spacing: -.09em; }
.china-intro p { margin: 0; color: var(--ink-soft); }
.map-frame { position: relative; min-height: 420px; margin-top: 52px; overflow: hidden; background: #d1c6b4; border: 1px solid rgba(23,33,31,.15); }
.map-frame::before, .map-frame::after { content: ''; position: absolute; border: 1px solid rgba(23,33,31,.18); border-radius: 50%; transform: rotate(-23deg); }
.map-frame::before { width: 78%; height: 55%; left: 10%; top: 18%; }
.map-frame::after { width: 42%; height: 75%; left: 28%; top: 2%; }
.map-label { position: absolute; color: rgba(23,33,31,.42); font: 500 10px var(--mono); letter-spacing: .08em; }
.map-label.north { top: 18px; left: 22px; }
.map-label.south { right: 22px; bottom: 18px; }
.map-point { position: absolute; z-index: 1; display: grid; grid-template-columns: 16px auto; gap: 8px; align-items: center; color: var(--ink); font-size: 12px; }
.map-point::before { content: ''; width: 12px; height: 12px; display: block; border: 2px solid var(--orange-dark); border-radius: 50%; background: var(--yellow); box-shadow: 0 0 0 5px rgba(189,84,46,.15); }
.map-point.liaoning { top: 25%; left: 70%; }
.map-point.inner-mongolia { top: 35%; left: 56%; }
.map-point.sichuan { top: 63%; left: 48%; }
.map-point.yunnan { top: 80%; left: 38%; }
.map-point.xinjiang { top: 29%; left: 25%; }
.region-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; margin-top: 18px; }
.region-card { min-height: 245px; padding: 23px; border: 1px solid var(--line); background: var(--paper); }
.region-card:nth-child(2n) { background: var(--cyan); }
.region-card:nth-child(3n) { background: var(--yellow); }
.region-card b { font: 500 10px var(--mono); letter-spacing: .08em; }
.region-card h3 { margin: 26px 0 8px; font: 700 23px/1.2 var(--display); }
.region-card p { margin: 0; color: var(--ink-soft); font-size: 13px; }
.region-card a { display: inline-block; margin-top: 18px; color: var(--orange-dark); font: 500 11px var(--mono); text-decoration: none; }
.reference-list { border-top: 1px solid rgba(250,248,242,.2); }
.reference-item { display: grid; grid-template-columns: 45px 1fr 130px; gap: 25px; align-items: start; padding: 23px 0; border-bottom: 1px solid rgba(250,248,242,.16); }
.reference-number { color: var(--yellow); font: 500 12px var(--mono); }
.reference-item h3 { margin: 0 0 5px; font: 700 20px/1.2 var(--display); }
.reference-item p { margin: 0; color: rgba(250,248,242,.58); font-size: 12px; }
.reference-item a { color: var(--cyan); font: 500 11px var(--mono); text-decoration: none; text-align: right; }
.reference-item a:hover { text-decoration: underline; }
.license-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; }
.license-card { padding: 23px; border: 1px solid var(--line); }
.license-card b { color: var(--orange); font: 500 11px var(--mono); }
.license-card h3 { margin: 27px 0 8px; font: 700 21px/1.2 var(--display); }
.license-card p { margin: 0; color: var(--ink-soft); font-size: 13px; }
.footer { color: rgba(250,248,242,.52); background: var(--ink); }
.footer-inner { display: flex; justify-content: space-between; gap: 30px; padding: 25px 0 36px; border-top: 1px solid rgba(250,248,242,.17); font: 500 10px var(--mono); letter-spacing: .04em; }
.reveal { opacity: 0; transform: translateY(15px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }
@media (max-width: 900px) {
  .page-hero-inner, .section-heading, .lab-grid, .china-intro { grid-template-columns: 1fr; gap: 32px; }
  .page-hero-inner { padding-top: 76px; }
  .hero-index { max-width: 380px; }
  .specimen-grid { grid-template-columns: repeat(2, 1fr); }
  .route-grid, .region-grid, .evidence-grid, .license-grid { grid-template-columns: repeat(2, 1fr); }
  .lab-aside { position: static; }
  .clock-row { grid-template-columns: 130px 1fr; }
  .clock-index { display: none; }
}
@media (max-width: 650px) {
  .container { width: min(100% - 32px, 520px); }
  .nav { min-height: 68px; }
  .nav-links { display: none; }
  .nav-code { font-size: 9px; }
  .page-hero-inner { padding: 60px 0 62px; }
  .page-hero h1 { font-size: clamp(49px, 15vw, 78px); }
  .section { padding: 76px 0 86px; }
  .section-heading { display: block; margin-bottom: 34px; }
  .section-heading h2 { margin-bottom: 20px; }
  .specimen-grid, .route-grid, .region-grid, .evidence-grid, .milestone-grid, .license-grid { grid-template-columns: 1fr; }
  .specimen-card { min-height: 280px; }
  .clock-row { display: block; padding: 23px 0 25px; }
  .clock-date { margin-bottom: 16px; }
  .lab-step { grid-template-columns: 55px 1fr; gap: 12px; }
  .map-frame { min-height: 355px; }
  .map-point { font-size: 10px; }
  .map-point.liaoning { left: 61%; }
  .map-point.inner-mongolia { left: 49%; }
  .map-point.sichuan { left: 40%; }
  .reference-item { grid-template-columns: 35px 1fr; gap: 12px; }
  .reference-item a { grid-column: 2; text-align: left; }
  .footer-inner { display: block; }
  .footer-inner span { display: block; margin-top: 7px; }
}