/* ============ 1. Reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:80px}
body,figure,blockquote,dl,dd,h1,h2,h3,h4,h5,p,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

/* ============ 2. Tokens ============ */
:root{
  --deep:#0B3A2C;
  --char:#14181B;
  --char-soft:#3A4340;
  --moss:#4E6B4C;
  --rock:#7A7E7C;
  --clay:#BE6B48;
  --bone:#F3EEE4;
  --bone-dim:#E3DCCE;
  --red:#D93A2B;
  --yellow:#F0BE2E;
  --blue:#2E7C9E;
  --orange:#E4813A;
  --line:rgba(20,24,27,.14);
  --line-invert:rgba(243,238,228,.16);
  --rail-w:96px;
  --topbar-h:56px;
  --maxw:1320px;
  --pad:clamp(18px,4.2vw,56px);
  --ease:cubic-bezier(.22,.7,.24,1);
  --font-display:"Songti SC","Noto Serif SC","Source Han Serif SC",Georgia,"Times New Roman",serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-data:"SFMono-Regular",Menlo,Consolas,"DejaVu Sans Mono","Courier New",monospace;
}

/* ============ 3. Base typography ============ */
body{
  background-color:var(--bone);
  color:var(--char);
  font-family:var(--font-body);
  font-size:clamp(16px,1.05vw,17.5px);
  line-height:1.75;
  letter-spacing:.01em;
  min-height:100vh;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.16;letter-spacing:-.01em}
p{text-wrap:pretty}
::selection{background-color:var(--clay);color:var(--bone)}
:focus-visible{outline:2px solid var(--clay);outline-offset:3px}
.rail :focus-visible,.site-footer :focus-visible{outline-color:var(--yellow)}

.t-eyebrow{font-family:var(--font-data);font-size:12px;line-height:1.4;letter-spacing:.22em;color:var(--clay);display:block}
.t-display{font-family:var(--font-display);font-weight:800;font-size:clamp(38px,5.6vw,64px);line-height:1.12;letter-spacing:-.015em}
.t-h2{font-family:var(--font-display);font-weight:800;font-size:clamp(27px,3.6vw,42px);line-height:1.18}
.t-h3{font-family:var(--font-display);font-weight:800;font-size:clamp(20px,2.2vw,25px);line-height:1.3}
.t-lead{font-size:clamp(17px,1.5vw,20px);line-height:1.7;color:var(--char-soft);max-width:720px}
.t-note{font-size:13px;line-height:1.7;color:var(--rock);letter-spacing:.02em}
.data{font-family:var(--font-data);letter-spacing:.02em;font-variant-numeric:tabular-nums}

/* ============ 4. Layout primitives ============ */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}
.section{padding-block:clamp(56px,8vw,120px);position:relative}
.section--tight{padding-block:clamp(34px,5vw,66px)}
.section--deep{background-color:var(--deep);color:var(--bone)}
.section--moss{background-color:var(--moss);color:var(--bone)}
.section--char{background-color:var(--char);color:var(--bone)}
.section--deep .t-lead,.section--moss .t-lead,.section--char .t-lead{color:rgba(243,238,228,.82)}
.section--deep .t-note,.section--moss .t-note,.section--char .t-note{color:rgba(243,238,228,.6)}
.section--deep .t-eyebrow,.section--moss .t-eyebrow,.section--char .t-eyebrow{color:var(--yellow)}

.grid{display:grid;gap:clamp(18px,2.6vw,40px)}
.grid--12{grid-template-columns:repeat(12,1fr)}
.col-3,.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:1 / -1}
.stack{display:flow-root}
.stack > * + *{margin-top:var(--stack-gap,16px)}
.slant{height:clamp(26px,4.6vw,62px);background-color:var(--deep);clip-path:polygon(0 100%,100% 0,100% 100%);pointer-events:none}

.section-head{display:grid;gap:14px;max-width:840px;margin-bottom:clamp(26px,4vw,52px)}
.section-head__title{font-family:var(--font-display);font-weight:800;font-size:clamp(27px,3.6vw,42px);line-height:1.18}
.section-head__lead{font-size:clamp(16px,1.4vw,19px);color:var(--char-soft);max-width:720px}
.section--deep .section-head__lead,.section--moss .section-head__lead,.section--char .section-head__lead{color:rgba(243,238,228,.82)}

/* ============ 5. Shared header ============ */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 18px;background-color:var(--char);color:var(--bone);
  font-family:var(--font-data);font-size:13px;letter-spacing:.1em;
  transform:translateY(-180%);transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.site-header{z-index:60}
.rail{position:relative;background-color:var(--deep);color:var(--bone)}
.brand{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:0 9px}
.brand__mark{
  grid-row:span 2;width:16px;height:16px;flex:none;
  background-color:var(--clay);clip-path:polygon(0 0,100% 0,0 100%);
}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:19px;line-height:1.2;letter-spacing:.05em;color:var(--bone)}
.brand__sub{font-family:var(--font-data);font-size:10px;line-height:1.35;letter-spacing:.14em;color:var(--rock)}

.rail__navlabel{font-family:var(--font-data);font-size:10.5px;letter-spacing:.2em;color:var(--rock)}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-list__item{display:block}
.nav-link{
  display:block;border-left:2px solid transparent;color:rgba(243,238,228,.8);
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-link__num{display:block;font-family:var(--font-data);font-size:10px;letter-spacing:.16em;color:var(--rock)}
.nav-link__text{display:block}
.nav-link:hover,.nav-link:focus-visible{background-color:var(--moss);color:var(--bone);border-left-color:var(--yellow)}
.nav-link:hover .nav-link__num,.nav-link:focus-visible .nav-link__num{color:var(--yellow)}
.nav-link[aria-current="page"]{background-color:var(--char);color:var(--bone);border-left-color:var(--clay)}
.nav-link[aria-current="page"] .nav-link__num{color:var(--yellow)}

.rail__coord{font-family:var(--font-data);font-size:11px;letter-spacing:.14em;color:var(--rock)}
.rail__cta{width:100%}
.rail__progress{position:absolute;background-color:rgba(243,238,228,.14);pointer-events:none}
.rail__progress-bar{
  display:block;height:100%;background-color:var(--blue);
  background-image:linear-gradient(90deg,var(--blue),var(--orange));
  transform:scaleX(var(--progress,0));transform-origin:left;
}

/* ============ 6. Buttons, links, tags ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;font-family:var(--font-body);font-size:14px;line-height:1.2;
  letter-spacing:.08em;border:1px solid currentColor;background-color:transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.btn--accent{background-color:var(--clay);color:var(--bone);border-color:var(--clay)}
.btn--accent:hover,.btn--accent:focus-visible{background-color:var(--yellow);color:var(--char);border-color:var(--yellow)}
.btn--ghost{color:rgba(243,238,228,.85);border-color:rgba(243,238,228,.42)}
.btn--ghost:hover,.btn--ghost:focus-visible{color:var(--yellow);border-color:var(--yellow)}
.btn--dark{color:var(--char);border-color:var(--char)}
.btn--dark:hover,.btn--dark:focus-visible{background-color:var(--char);color:var(--bone)}

.link-underline{position:relative;display:inline-block;color:var(--clay)}
.link-underline::after{
  content:"";position:absolute;left:0;bottom:-2px;width:100%;height:1px;
  background-color:currentColor;transform:scaleX(0);transform-origin:left;
  transition:transform .2s var(--ease);
}
.link-underline:hover::after,.link-underline:focus-visible::after{transform:scaleX(1)}

.tag{
  display:inline-flex;align-items:center;gap:6px;padding:3px 10px;
  font-family:var(--font-data);font-size:11.5px;letter-spacing:.14em;
  background-color:var(--moss);color:var(--bone);
  clip-path:polygon(0 0,calc(100% - 8px) 0,100% 8px,100% 100%,0 100%);
}
.tag--red{background-color:var(--red);color:var(--bone)}
.tag--yellow{background-color:var(--yellow);color:var(--char)}
.tag--blue{background-color:var(--blue);color:var(--bone)}

/* ============ 7. Panels, media, data blocks ============ */
.panel{background-color:var(--bone-dim);padding:clamp(20px,3vw,36px)}
.panel--deep{background-color:var(--deep);color:var(--bone)}
.cut{clip-path:polygon(0 0,calc(100% - 24px) 0,100% 24px,100% 100%,0 100%)}
.cut--tl{clip-path:polygon(0 24px,24px 0,100% 0,100% 100%,0 100%)}

.media{position:relative;overflow:hidden;background-color:var(--moss);width:100%}
.media img{width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--21x9{aspect-ratio:21/9}
.media--cut{clip-path:polygon(0 0,calc(100% - 28px) 0,100% 28px,100% 100%,0 100%)}
.media--pitch::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(243,238,228,.14) 0 1px,transparent 1px 64px),
    repeating-linear-gradient(0deg,rgba(243,238,228,.10) 0 1px,transparent 1px 64px);
}
.media__caption{
  position:absolute;left:0;bottom:0;right:0;padding:10px 14px;
  background-color:rgba(11,58,44,.86);color:var(--bone);
  font-family:var(--font-data);font-size:12px;letter-spacing:.08em;
}

.stat{border-left:2px solid var(--clay);padding-left:14px}
.stat__num{display:block;font-family:var(--font-data);font-size:clamp(26px,3.6vw,40px);line-height:1.1;letter-spacing:.02em}
.stat__label{display:block;margin-top:6px;font-size:13px;letter-spacing:.08em;color:var(--rock)}
.section--deep .stat__label,.section--moss .stat__label,.section--char .stat__label{color:rgba(243,238,228,.6)}

.legend{display:flex;flex-wrap:wrap;gap:10px 22px}
.legend__item{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--char-soft)}
.section--deep .legend__item,.section--moss .legend__item,.section--char .legend__item{color:rgba(243,238,228,.82)}
.legend__swatch{width:12px;height:12px;flex:none;background-color:var(--rock);clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%)}
.legend__swatch--red{background-color:var(--red)}
.legend__swatch--yellow{background-color:var(--yellow)}
.legend__swatch--clay{background-color:var(--clay)}
.legend__swatch--blue{background-color:var(--blue)}
.legend__swatch--orange{background-color:var(--orange)}
.legend__swatch--moss{background-color:var(--moss)}

.coord-index{border-top:1px solid var(--line)}
.coord-index__row{
  display:grid;grid-template-columns:auto 1fr auto;align-items:baseline;gap:8px 18px;
  padding:12px 2px;border-bottom:1px solid var(--line);
}
.section--deep .coord-index,.section--char .coord-index{border-top-color:var(--line-invert)}
.section--deep .coord-index__row,.section--char .coord-index__row{border-bottom-color:var(--line-invert)}
.coord-index__key{font-family:var(--font-data);font-size:12px;letter-spacing:.14em;color:var(--rock)}
.coord-index__val{font-family:var(--font-data);letter-spacing:.02em}

.breadcrumbs{font-family:var(--font-data);font-size:12.5px;letter-spacing:.08em;color:var(--rock)}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs__item{display:flex;align-items:center;gap:8px}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";color:var(--rock);opacity:.7}
.breadcrumbs__link:hover,.breadcrumbs__link:focus-visible{color:var(--clay)}

/* ============ 8. Prose ============ */
.prose{max-width:720px}
.prose > * + *{margin-top:1.05em}
.prose h2{font-size:clamp(22px,2.4vw,28px);margin-top:1.8em}
.prose h3{font-size:clamp(18px,1.9vw,21px);margin-top:1.5em}
.prose ul{display:grid;gap:.5em}
.prose li{padding-left:1.1em;position:relative}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;background-color:var(--clay)}
.prose strong{font-weight:700}

/* ============ 9. Reveal protocol ============ */
.has-js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .3s var(--ease),transform .3s var(--ease)}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ============ 10. Footer ============ */
.site-footer{
  position:relative;margin-top:clamp(48px,7vw,110px);
  background-color:var(--deep);color:rgba(243,238,228,.86);
  background-image:repeating-linear-gradient(107deg,rgba(243,238,228,.045) 0 1px,transparent 1px 26px);
  clip-path:polygon(0 clamp(22px,4vw,56px),100% 0,100% 100%,0 100%);
  padding-top:clamp(58px,8vw,96px);
}
.site-footer__inner{
  display:grid;gap:clamp(28px,4vw,52px);grid-template-columns:1fr;
  padding-bottom:clamp(34px,5vw,62px);
}
.footer__brand{font-family:var(--font-display);font-weight:800;font-size:clamp(22px,2.4vw,28px);color:var(--bone);letter-spacing:.04em}
.footer__summary{margin-top:12px;max-width:420px;font-size:16px;line-height:1.75;color:rgba(243,238,228,.78)}
.footer__coord{margin-top:16px;font-family:var(--font-data);font-size:11.5px;letter-spacing:.16em;color:var(--rock)}
.footer__title{font-family:var(--font-data);font-weight:400;font-size:11.5px;letter-spacing:.22em;color:var(--yellow);margin-bottom:14px}
.footer__list{display:grid;gap:10px;font-size:15px}
.footer__link{position:relative;display:inline-block;color:rgba(243,238,228,.82)}
.footer__link::after{
  content:"";position:absolute;left:0;bottom:-2px;width:100%;height:1px;background-color:currentColor;
  transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease);
}
.footer__link:hover,.footer__link:focus-visible{color:var(--clay)}
.footer__link:hover::after,.footer__link:focus-visible::after{transform:scaleX(1)}
.footer__list--contact{color:rgba(243,238,228,.72);font-size:14px;max-width:320px}
.footer__list--contact .data{color:var(--bone)}
.site-footer__base{background-color:var(--char);color:rgba(243,238,228,.58)}
.site-footer__baseinner{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;
  padding-block:18px;font-family:var(--font-data);font-size:12.5px;letter-spacing:.08em;
}
.footer__legal,.footer__meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.footer__sep{color:var(--rock);opacity:.8}

/* ============ 11. Mobile / tablet ============ */
@media (max-width:1023.98px){
  body{padding-top:var(--topbar-h)}
  body.is-nav-open{overflow:hidden}
  .site-header{position:fixed;top:0;left:0;right:0;z-index:60}
  .rail{
    display:flex;align-items:center;justify-content:space-between;gap:12px;
    height:var(--topbar-h);padding:0 16px;border-bottom:1px solid var(--line-invert);
  }
  .rail__nav{
    position:fixed;top:0;right:0;bottom:0;z-index:70;
    width:min(340px,88vw);display:flex;flex-direction:column;gap:14px;
    padding:78px 22px 30px;background-color:var(--char);
    border-left:1px solid var(--clay);overflow-y:auto;
    transform:translateX(102%);transition:transform .22s var(--ease);
  }
  .rail__nav[data-open]{transform:translateX(0)}
  .rail__navlabel{color:rgba(243,238,228,.5)}
  .nav-list{margin-top:4px}
  .nav-link{padding:12px;font-size:15px;letter-spacing:.04em}
  .nav-link__num{margin-bottom:2px}
  .rail__foot{margin-top:auto;display:flex;flex-direction:column;gap:12px}
  .rail__progress{left:0;right:0;bottom:0;height:3px}
  .nav-toggle{
    display:flex;position:fixed;right:18px;bottom:18px;z-index:80;align-items:center;gap:10px;
    padding:12px 16px;background-color:var(--deep);color:var(--bone);border:1px solid var(--clay);
    font-size:13px;letter-spacing:.14em;
    clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  }
  .nav-toggle__label{font-family:var(--font-data)}
  .nav-toggle__icon{position:relative;display:block;width:18px;height:12px;flex:none}
  .nav-toggle__icon::before,.nav-toggle__icon::after{
    content:"";position:absolute;left:0;width:100%;height:2px;background-color:var(--yellow);
    transition:transform .18s var(--ease);
  }
  .nav-toggle__icon::before{top:0}
  .nav-toggle__icon::after{bottom:0}
  .nav-toggle[aria-expanded="true"] .nav-toggle__icon::before{transform:translateY(5px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__icon::after{transform:translateY(-5px) rotate(-45deg)}
}

/* ============ 12. Desktop rail ============ */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .site-header{position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:60}
  .rail{
    display:flex;flex-direction:column;height:100%;padding:24px 0 18px;
    border-right:1px solid var(--line-invert);
    background-image:repeating-linear-gradient(118deg,rgba(243,238,228,.05) 0 1px,transparent 1px 24px);
  }
  .brand{display:flex;flex-direction:column;align-items:center;gap:16px;padding:0 8px}
  .brand__mark{grid-row:auto}
  .brand__name{writing-mode:vertical-rl;text-orientation:upright;font-size:20px;line-height:1.3;letter-spacing:.2em}
  .brand__sub{display:none}
  .rail__nav{display:flex;flex-direction:column;flex:1;min-height:0;margin-top:26px;padding:0 8px;overflow-y:auto}
  .rail__navlabel{padding:0 8px}
  .nav-list{margin-top:12px}
  .nav-link{padding:10px 8px;font-size:12.5px;line-height:1.35;letter-spacing:.06em}
  .rail__foot{margin-top:auto;padding-top:18px;display:flex;flex-direction:column;gap:10px}
  .rail__cta{padding:11px 6px;font-size:12.5px;letter-spacing:.06em}
  .rail__progress{top:0;right:0;width:3px;height:100%}
  .rail__progress-bar{
    height:100%;background-image:linear-gradient(180deg,var(--blue),var(--orange));
    transform:scaleY(var(--progress,0));transform-origin:top;
  }
  .nav-toggle{display:none}
  .site-footer__inner{grid-template-columns:1.45fr 1.6fr 1.35fr}
  .footer__links{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,3vw,38px);align-content:start}
}

/* ============ 13. Mid breakpoints ============ */
@media (min-width:900px){
  .grid--12{grid-template-columns:repeat(12,1fr)}
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
}
@media (max-width:899.98px){
  .grid--12{grid-template-columns:repeat(6,1fr)}
}

/* ============ 14. Reduced motion ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms !important;animation-duration:.01ms !important;animation-iteration-count:1 !important}
  .has-js [data-reveal]{opacity:1;transform:none}
  .rail__nav{transition:none}
}