/* ===== 1. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol,dl{margin:0}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}
main{display:block}
[hidden]{display:none !important}

/* ===== 2. Tokens ===== */
:root{
  --clay:#A8452B;
  --clay-deep:#6E2E1C;
  --clay-light:#C97B54;
  --gold:#E8A33D;
  --peacock:#16706B;
  --peacock-deep:#0C4A46;
  --sand:#F3EADF;
  --paper:#FBF7F1;
  --ink:#2A1C16;
  --line:#8FA6A2;

  --ink-soft:rgba(42,28,22,.78);
  --ink-mute:rgba(42,28,22,.62);
  --line-soft:rgba(143,166,162,.5);

  --font-head:"壹号窄黑","Noto Sans SC Condensed","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --maxw:1440px;
  --gutter:clamp(16px,4vw,56px);
  --sticky-top:118px;
  --fast:180ms;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ===== 3. Base typography ===== */
body{
  background-color:var(--sand);
  background-image:
    linear-gradient(rgba(143,166,162,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(143,166,162,.14) 1px,transparent 1px);
  background-size:64px 64px,64px 64px;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{font-family:var(--font-head);font-weight:800;line-height:1.14;letter-spacing:0}
.t-display{font-family:var(--font-head);font-weight:800;font-size:clamp(2.4rem,9vw,7rem);line-height:.96;letter-spacing:0}
.t-h1,h1{font-size:clamp(1.9rem,4.4vw,3.3rem)}
.t-h2,h2{font-size:clamp(1.45rem,2.7vw,2.2rem)}
.t-h3,h3{font-size:clamp(1.12rem,1.7vw,1.42rem)}
p{max-width:none}
.lead{font-size:clamp(1.02rem,1.5vw,1.22rem);line-height:1.8;color:var(--ink-soft)}
.mono{font-family:var(--font-mono);letter-spacing:.02em;font-variant-numeric:tabular-nums}
.eyebrow{display:inline-flex;align-items:center;gap:.6em;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--peacock-deep)}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--clay)}
.note{border-left:3px solid var(--gold);background:rgba(232,163,61,.1);padding:14px 18px;font-size:.92rem;line-height:1.75}
.tag{display:inline-flex;align-items:center;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--peacock-deep);border-bottom:1px solid var(--peacock);padding-bottom:2px}

/* ===== 4. Layout ===== */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.section--paper{background:var(--paper);border-block:1px solid var(--line)}
.section--clay{background:var(--clay);color:var(--paper)}
.section--deep{background:var(--clay-deep);color:var(--sand)}
.section--peacock{background:var(--peacock-deep);color:var(--paper)}
.section--clay h1,.section--clay h2,.section--clay h3,.section--deep h1,.section--deep h2,.section--deep h3,.section--peacock h1,.section--peacock h2,.section--peacock h3{color:var(--paper)}
.section--deep a,.section--peacock a,.section--clay a{color:var(--paper)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

.split{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,9fr);gap:clamp(20px,3vw,48px);align-items:start}
.split__rail{position:sticky;top:var(--sticky-top);align-self:start}
.split__content{min-width:0}

.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:14px 28px;margin-bottom:clamp(20px,3vw,36px);padding-bottom:14px;border-bottom:1px solid var(--line)}
.section__index{display:inline-block;background:var(--clay);color:var(--paper);font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;padding:.42em .72em;line-height:1}

.rail{display:flex;gap:clamp(12px,1.6vw,20px);overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:14px;scrollbar-color:var(--clay-light) transparent}
.rail > *{flex:0 0 clamp(240px,26vw,340px);scroll-snap-align:start}
.rail--wide > *{flex:0 0 clamp(280px,38vw,540px)}

.prose{max-width:78ch;font-size:1.02rem;line-height:1.85;color:var(--ink-soft)}
.prose > * + *{margin-top:1.1em}
.prose h2,.prose h3{margin-top:1.8em;color:var(--ink)}
.prose ul{padding:0;list-style:none}
.prose ul > li{position:relative;padding-left:1.5em}
.prose ul > li::before{content:"";position:absolute;left:0;top:.86em;width:11px;height:1px;background:var(--clay)}
.prose a{color:var(--peacock-deep);text-decoration:underline;text-underline-offset:3px}

/* ===== 5. Skip link & focus ===== */
.skip-link{position:absolute;left:12px;top:-64px;z-index:200;display:inline-block;padding:.6em 1.1em;background:var(--ink);color:var(--paper);font-size:.9rem;text-decoration:none;transition:top var(--fast) var(--ease)}
.skip-link:focus{top:12px}
:focus-visible{outline:2px solid var(--peacock);outline-offset:3px}
.site-footer :focus-visible{outline-color:var(--gold)}

/* ===== 6. Header ===== */
.site-header{position:sticky;top:0;z-index:90;background:var(--paper);border-bottom:1px solid var(--line);transition:box-shadow var(--fast) var(--ease)}
.site-header[data-scrolled="true"]{box-shadow:0 1px 0 var(--line),0 12px 28px rgba(42,28,22,.08)}
.site-header__bar{display:grid;grid-template-columns:auto minmax(0,1fr) auto auto;align-items:center;gap:clamp(12px,2.2vw,36px);width:100%;max-width:var(--maxw);margin-inline:auto;padding:12px var(--gutter);min-height:74px}

.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;text-decoration:none;color:inherit}
.brand__mark{display:grid;place-items:center;width:48px;height:48px;flex:0 0 auto;background:var(--clay);color:var(--paper);font-family:var(--font-head);font-weight:800;font-size:1.3rem;line-height:1;clip-path:polygon(0 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%)}
.brand__text{display:flex;flex-direction:column;line-height:1.3}
.brand__name{font-family:var(--font-head);font-weight:800;font-size:1.04rem}
.brand__suffix{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.13em;color:var(--clay-deep);white-space:nowrap}

.site-nav{min-width:0}
.site-nav__list{display:flex;align-items:center;gap:clamp(10px,1.6vw,26px);overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}
.site-nav__list::-webkit-scrollbar{display:none}
.site-nav__link{position:relative;display:inline-block;padding:10px 2px;white-space:nowrap;text-decoration:none;font-size:.92rem;font-weight:500;color:var(--ink-soft);transition:color var(--fast) var(--ease)}
.site-nav__link::after{content:"";position:absolute;left:0;right:0;bottom:4px;height:2px;background:var(--peacock);transform:scaleX(0);transform-origin:left center;transition:transform var(--fast) var(--ease)}
.site-nav__link:hover{color:var(--peacock-deep)}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--clay-deep);font-weight:700}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__foot{display:none}

.site-header__actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}

.nav-toggle{display:none;align-items:center;justify-content:center;gap:9px;min-width:44px;min-height:44px;padding:10px 12px;background:transparent;border:1px solid var(--line);color:var(--clay-deep);font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;cursor:pointer}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:currentColor;transition:background var(--fast) var(--ease)}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;transition:top var(--fast) var(--ease),transform var(--fast) var(--ease)}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.site-header[data-open="true"] .nav-toggle__bars{background:transparent}
.site-header[data-open="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}

.version-rail{border-top:1px solid var(--line);background:linear-gradient(90deg,rgba(201,123,84,.16),rgba(201,123,84,0) 46%)}
.version-rail__inner{display:flex;align-items:center;gap:clamp(10px,2vw,24px);width:100%;max-width:var(--maxw);margin-inline:auto;padding:8px var(--gutter);font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;color:var(--clay-deep)}
.version-rail__label{flex:0 0 auto;color:var(--peacock-deep);text-transform:uppercase}
.version-rail__ticks{display:flex;gap:16px;flex:0 0 auto;overflow-x:auto;scrollbar-width:none}
.version-rail__ticks::-webkit-scrollbar{display:none}
.version-rail__tick{white-space:nowrap;color:var(--ink-mute)}
.version-rail__tick[data-active="true"]{color:var(--clay);font-weight:700}
.progress{position:relative;flex:1 1 auto;min-width:52px;height:3px;background:var(--line-soft);overflow:hidden}
.progress__fill{position:absolute;top:0;bottom:0;left:0;width:0;background:var(--gold)}
.progress__num{flex:0 0 auto;color:var(--clay-deep)}

/* ===== 7. Buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;padding:.62em 1.15em;border:1px solid var(--ink);background:transparent;color:var(--ink);font-family:var(--font-body);font-size:.9rem;font-weight:600;line-height:1.4;text-decoration:none;cursor:pointer;border-radius:0;transition:background var(--fast) var(--ease),color var(--fast) var(--ease),border-color var(--fast) var(--ease)}
.btn--solid{background:var(--clay);border-color:var(--clay);color:var(--paper)}
.btn--solid:hover{background:var(--clay-deep);border-color:var(--clay-deep);color:var(--paper)}
.btn--ghost{border-color:var(--line);color:var(--clay-deep)}
.btn--ghost:hover{border-color:var(--peacock);background:rgba(22,112,107,.08);color:var(--peacock-deep)}
.section--deep .btn,.section--peacock .btn{border-color:var(--gold);color:var(--sand)}
.section--deep .btn--solid,.section--peacock .btn--solid{background:var(--gold);color:var(--clay-deep);border-color:var(--gold)}

/* ===== 8. Components ===== */
.card{position:relative;display:flex;flex-direction:column;gap:12px;padding:clamp(18px,2vw,26px);background:var(--paper);border:1px solid var(--line)}
.card::before{content:"";position:absolute;left:-1px;top:-1px;width:36px;height:3px;background:var(--clay)}
.card--peacock::before{background:var(--peacock)}
.card--gold::before{background:var(--gold)}
.card__meta{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--peacock-deep)}
.card__title{font-family:var(--font-head);font-weight:800;font-size:1.14rem;line-height:1.35}
.section--deep .card,.section--peacock .card{background:rgba(251,247,241,.06);border-color:rgba(243,234,223,.28);color:var(--sand)}

.stat{display:flex;flex-direction:column;gap:6px;padding-left:14px;border-left:2px solid var(--gold)}
.stat__num{font-family:var(--font-mono);font-weight:600;font-size:clamp(1.7rem,3.4vw,2.6rem);line-height:1;color:var(--clay-deep);font-variant-numeric:tabular-nums}
.stat__label{font-size:.84rem;line-height:1.6;color:var(--ink-mute)}
.section--deep .stat__num,.section--peacock .stat__num{color:var(--gold)}

.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.chip{appearance:none;padding:.5em .95em;background:transparent;border:1px solid var(--line);color:var(--clay-deep);font-family:var(--font-mono);font-size:.75rem;letter-spacing:.08em;cursor:pointer;border-radius:0;transition:background var(--fast) var(--ease),color var(--fast) var(--ease),border-color var(--fast) var(--ease)}
.chip:hover{border-color:var(--peacock);color:var(--peacock-deep)}
.chip[aria-pressed="true"]{background:var(--peacock);border-color:var(--peacock);color:var(--paper)}
.filter-bar__count{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--ink-mute);margin-left:auto}

.accordion{border-top:1px solid var(--line)}
.accordion__item{border-bottom:1px solid var(--line)}
.accordion__trigger{display:flex;align-items:baseline;gap:14px;width:100%;padding:16px 2px;background:transparent;border:0;text-align:left;cursor:pointer;font-family:var(--font-head);font-weight:700;font-size:1.02rem;line-height:1.5;color:var(--ink)}
.accordion__trigger::after{content:"+";margin-left:auto;font-family:var(--font-mono);font-weight:400;font-size:1.1rem;color:var(--clay)}
.accordion__trigger[aria-expanded="true"]::after{content:"–"}
.accordion__panel{padding:0 2px 20px;font-size:.98rem;line-height:1.8;color:var(--ink-soft)}

.table-wrap{overflow-x:auto;border:1px solid var(--line);background:var(--paper)}
.table{width:100%;border-collapse:collapse;font-size:.94rem}
.table th{background:var(--peacock-deep);color:var(--paper);font-family:var(--font-mono);font-weight:500;font-size:.72rem;letter-spacing:.1em;text-align:left;padding:12px 14px;white-space:nowrap}
.table td{padding:12px 14px;border-bottom:1px solid var(--line-soft);vertical-align:top}
.table tbody tr:nth-child(even) td{background:var(--paper)}
.table tbody tr:nth-child(odd) td{background:rgba(243,234,223,.5)}
.table .num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

.media{position:relative;background:var(--paper);border:1px solid var(--line);overflow:hidden}
.media img{width:100%;height:100%;object-fit:cover}
.media__frame{position:relative;aspect-ratio:4/3;background-color:var(--sand);background-image:linear-gradient(rgba(143,166,162,.34) 1px,transparent 1px),linear-gradient(90deg,rgba(143,166,162,.34) 1px,transparent 1px);background-size:28px 28px,28px 28px}
.media--wide .media__frame{aspect-ratio:16/9}
.media--tall .media__frame{aspect-ratio:3/4}
.media--square .media__frame{aspect-ratio:1/1}
.media__caption{padding:10px 13px;border-top:1px solid var(--line);background:var(--paper);font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;color:var(--ink-mute)}

.breadcrumb{background:var(--paper);border-bottom:1px solid var(--line)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding-block:13px;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--ink-mute)}
.breadcrumb__item{display:flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--clay-light)}
.breadcrumb__link{text-decoration:none;color:var(--peacock-deep)}
.breadcrumb__link:hover{text-decoration:underline;text-underline-offset:3px}
.breadcrumb__item[aria-current="page"]{color:var(--clay-deep)}

/* ===== 9. Footer ===== */
.site-footer{position:relative;background:var(--clay-deep);color:var(--sand);border-top:3px solid var(--gold)}
.site-footer__inner{width:100%;max-width:var(--maxw);margin-inline:auto;padding:clamp(36px,5vw,64px) var(--gutter) 28px}
.site-footer a{color:var(--sand);text-decoration:none}
.site-footer a:hover{color:var(--gold);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
.site-footer__top{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,2fr);gap:clamp(24px,4vw,64px);padding-bottom:clamp(24px,3vw,40px);border-bottom:1px solid rgba(243,234,223,.22)}
.site-footer__brand{display:flex;flex-direction:column;gap:12px;max-width:40ch}
.site-footer__mark{display:grid;place-items:center;width:56px;height:56px;background:var(--gold);color:var(--clay-deep);font-family:var(--font-head);font-weight:800;font-size:1.45rem;line-height:1;clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%)}
.site-footer__tagline{font-family:var(--font-head);font-weight:800;font-size:1.14rem;line-height:1.45;color:var(--paper)}
.site-footer__desc{font-size:.9rem;line-height:1.8;color:rgba(243,234,223,.76)}
.site-footer__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2.5vw,38px)}
.site-footer__col-title{margin-bottom:12px;font-family:var(--font-mono);font-weight:500;font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--gold)}
.site-footer__links{display:flex;flex-direction:column;gap:8px;font-size:.92rem;line-height:1.6}
.site-footer__contact{display:grid;gap:14px;padding-block:clamp(20px,3vw,32px);border-bottom:1px solid rgba(243,234,223,.22)}
.site-footer__facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px 32px}
.site-footer__fact dt{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--clay-light);margin-bottom:5px}
.site-footer__fact dd{font-size:.9rem;line-height:1.7}
.site-footer__note{font-size:.82rem;line-height:1.75;color:rgba(243,234,223,.7);max-width:76ch}
.site-footer__legal{display:flex;flex-wrap:wrap;align-items:center;gap:10px 26px;padding-top:20px;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:rgba(243,234,223,.74)}
.site-footer__copy,.site-footer__icp{margin:0}
.site-footer__legal-nav{display:flex;flex-wrap:wrap;gap:18px}

/* ===== 10. Motion ===== */
.js-ready [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity var(--fast) var(--ease),transform var(--fast) var(--ease)}
.js-ready [data-reveal="in"]{opacity:1;transform:none}
@keyframes navDrop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

/* ===== 11. Responsive ===== */
@media (max-width:1080px){
  .site-header__actions .btn--ghost{display:none}
  .split{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
}
@media (max-width:960px){
  .site-header__bar{grid-template-columns:minmax(0,1fr) auto;min-height:64px;gap:12px}
  .site-header__actions{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{display:none}
  .site-header[data-open="true"] .site-nav{display:block;grid-column:1 / -1;margin-top:10px;padding:4px 0 16px;border-top:1px solid var(--line);animation:navDrop var(--fast) var(--ease) both}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;overflow:visible}
  .site-nav__list > li{border-bottom:1px solid var(--line-soft)}
  .site-nav__link{display:block;padding:14px 4px;font-size:1rem}
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{padding-left:12px;border-left:2px solid var(--peacock);background:rgba(22,112,107,.07)}
  .site-nav__foot{display:flex;flex-wrap:wrap;gap:10px;padding-top:18px}
  .split{grid-template-columns:minmax(0,1fr)}
  .split__rail{position:static;top:auto}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__top{grid-template-columns:minmax(0,1fr)}
  :root{--sticky-top:104px}
}
@media (max-width:640px){
  body{font-size:16px}
  .version-rail__ticks{display:none}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .site-footer__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .filter-bar__count{margin-left:0;width:100%}
}
@media (max-width:420px){
  .brand__suffix{display:none}
  .site-footer__cols{grid-template-columns:minmax(0,1fr)}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .js-ready [data-reveal]{opacity:1;transform:none}
  .progress__fill{transition:none}
}