*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
[hidden]{display:none !important}

:root{
  --ink:#0B1B2B;
  --ink-2:#122A44;
  --ink-3:#0A1826;
  --gold:#C8A24A;
  --gold-lift:#E4C77B;
  --amber:#D9833F;
  --celadon:#5F8F7A;
  --rock:#6B7280;
  --paper:#F3EEE4;
  --terracotta:#A45D45;
  --mist:#D9E2E7;
  --rail-w:276px;
  --gutter:clamp(18px,3.4vw,48px);
  --line:rgba(217,226,231,.14);
  --line-soft:rgba(217,226,231,.08);
  --line-gold:rgba(200,162,74,.28);
  --font-sans:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- base ---------- */
body{
  background:var(--ink);
  color:#D3DCE6;
  font-family:var(--font-sans);
  font-size:clamp(15px,.35vw + 14px,17px);
  line-height:1.75;
  min-height:100vh;
  padding-left:0;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{line-height:1.18;font-weight:800;letter-spacing:.02em;color:#F3EEE4}
h1{font-size:clamp(1.9rem,3.4vw,2.9rem)}
h2{font-size:clamp(1.5rem,2.5vw,2.1rem)}
h3{font-size:clamp(1.12rem,1.5vw,1.32rem)}
p{max-width:40em}
:focus-visible{outline:2px solid var(--gold-lift);outline-offset:3px}
::selection{background:rgba(200,162,74,.35);color:#FFF8E6}

.mono,.eyebrow{font-family:var(--font-mono)}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:.7rem;letter-spacing:.24em;text-transform:uppercase;color:var(--gold)}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold)}
.h-display{font-size:clamp(2.3rem,6.2vw,4.6rem);line-height:1.02;letter-spacing:.04em;font-weight:800;color:#F7F3EA}
.h-section{font-size:clamp(1.45rem,2.4vw,2rem);letter-spacing:.03em;font-weight:800;color:#F3EEE4}
.rule{border:0;height:1px;background:var(--line);margin:0}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;left:12px;top:-72px;z-index:200;
  padding:12px 20px;background:var(--gold);color:var(--ink);
  font-weight:700;letter-spacing:.08em;text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- header shell ---------- */
.site-head{position:sticky;top:0;z-index:60;background:var(--ink)}
.site-head[data-open="true"]{z-index:90}

/* ---------- rail (brand track / drawer) ---------- */
.rail{
  position:fixed;top:0;bottom:0;left:0;z-index:80;
  width:min(88vw,340px);
  display:flex;flex-direction:column;gap:22px;
  padding:22px 20px 20px;
  overflow-y:auto;overscroll-behavior:contain;
  background-image:
    repeating-linear-gradient(0deg,rgba(217,226,231,.05) 0 1px,transparent 1px 56px),
    linear-gradient(180deg,#0B1B2B 0%,#0A1826 55%,#08131F 100%);
  border-right:1px solid var(--line-gold);
  transform:translateX(-102%);
  transition:transform .34s var(--ease);
}
.site-head[data-open="true"] .rail{transform:none;box-shadow:0 0 60px rgba(0,0,0,.55)}

.rail__brand{
  display:grid;
  grid-template-columns:44px 1fr;
  grid-template-areas:"mark name" "mark line";
  column-gap:12px;align-items:center;
  padding-bottom:18px;border-bottom:1px solid var(--line);
}
.rail__mark{
  grid-area:mark;width:44px;height:44px;
  display:grid;place-items:center;position:relative;
  border:1px solid var(--gold);
  color:var(--gold-lift);text-decoration:none;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;
  background:linear-gradient(135deg,rgba(200,162,74,.18),transparent 62%);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.rail__mark::after{
  content:"";position:absolute;right:-1px;bottom:-1px;width:10px;height:10px;
  background:var(--gold);clip-path:polygon(100% 0,100% 100%,0 100%);
}
.rail__mark:hover{background:linear-gradient(135deg,rgba(200,162,74,.32),transparent 62%);color:#FFF8E6}
.rail__name{grid-area:name;font-size:1.14rem;font-weight:800;letter-spacing:.16em;color:#F5F1E8;line-height:1.25}
.rail__line{grid-area:line;margin-top:5px;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;color:#8B9AA8}
.rail__line .mono{color:var(--gold)}

/* ---------- nav ---------- */
.nav{flex:0 0 auto}
.nav__list{display:grid;gap:0}
.nav__item + .nav__item .nav__link{border-top:1px solid var(--line-soft)}
.nav__link{
  display:grid;grid-template-columns:26px 1fr;align-items:center;gap:10px;
  min-height:46px;padding:9px 8px 9px 12px;
  border-left:3px solid transparent;
  text-decoration:none;color:#AFBDCB;
  font-size:.95rem;font-weight:600;letter-spacing:.05em;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.nav__num{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.1em;color:var(--rock);transition:color .2s var(--ease)}
.nav__label{display:block}
.nav__link:hover{color:var(--gold-lift);background:rgba(200,162,74,.07)}
.nav__link:hover .nav__num{color:var(--gold)}
.nav__link[aria-current="page"]{
  color:#FFF8E6;border-left-color:var(--gold);
  background:linear-gradient(90deg,rgba(200,162,74,.18),rgba(200,162,74,0) 72%);
}
.nav__link[aria-current="page"] .nav__num{color:var(--gold-lift)}

/* ---------- rail aux + foot ---------- */
.rail__aux{margin-top:auto;display:grid;gap:8px;padding-top:16px;border-top:1px solid var(--line)}
.rail__aux-link{
  display:flex;align-items:center;gap:9px;min-height:42px;padding:0 12px;
  border:1px solid rgba(217,226,231,.18);
  text-decoration:none;color:#C6D2DE;font-size:.82rem;letter-spacing:.06em;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.rail__aux-link::before{content:"";flex:0 0 auto;width:5px;height:5px;background:var(--amber)}
.rail__aux-link:hover{border-color:var(--gold);color:var(--gold-lift);background:rgba(200,162,74,.09)}
.rail__foot{display:grid;gap:6px;padding-top:6px}
.rail__status{display:flex;align-items:center;gap:8px;font-size:.74rem;letter-spacing:.06em;color:#8B9AA8}
.rail__dot{flex:0 0 auto;width:6px;height:6px;background:var(--celadon);box-shadow:0 0 0 3px rgba(95,143,122,.2)}
.rail__code{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.18em;color:#5B6A78}

/* ---------- topbar ---------- */
.topbar{
  position:relative;
  display:flex;align-items:center;gap:12px;
  min-height:60px;padding:8px var(--gutter);
  background:rgba(9,21,33,.95);
  border-bottom:1px solid var(--line);
  color:#AEBBC8;
}
.topbar__brand{margin-right:auto;text-decoration:none;font-weight:800;letter-spacing:.14em;font-size:1rem;color:#F3EEE4}
.topbar__tag{display:none}
.topbar__meta{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.16em;color:#6E7F8E;white-space:nowrap}
.topbar__tag .mono{color:var(--gold)}

.nav-toggle{
  flex:0 0 auto;width:44px;height:44px;
  display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  border:1px solid rgba(200,162,74,.42);
  background:rgba(200,162,74,.08);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);background:rgba(200,162,74,.16)}
.nav-toggle__bar{display:block;width:18px;height:1.5px;background:var(--gold-lift);transition:transform .24s var(--ease),opacity .2s var(--ease)}
.site-head[data-open="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.site-head[data-open="true"] .nav-toggle__bar:nth-child(2){opacity:0}
.site-head[data-open="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

.nav-scrim{
  position:fixed;inset:0;z-index:70;
  background:rgba(6,14,22,.68);
  opacity:0;pointer-events:none;
  transition:opacity .3s var(--ease);
}
.site-head[data-open="true"] .nav-scrim{opacity:1;pointer-events:auto}

.scroll-meter{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(217,226,231,.09);pointer-events:none}
.scroll-meter__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--gold-lift));
  transition:transform .12s linear;
}

/* ---------- footer ---------- */
.site-foot{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  padding:clamp(34px,5vw,62px) var(--gutter) 26px;
  background:linear-gradient(180deg,#0A1826 0%,#08131F 100%);
  border-top:1px solid var(--line-gold);
  color:#AEBBC8;
}
.site-foot::before{
  content:"";position:absolute;left:0;top:-1px;height:1px;width:min(46%,420px);
  background:linear-gradient(90deg,var(--gold),rgba(200,162,74,0));
}
.foot__grid{
  display:grid;gap:clamp(24px,3.2vw,44px);
  grid-template-columns:1fr;
  max-width:1180px;margin-inline:auto;
}
.foot__brand{min-width:0}
.foot__name{font-size:1.22rem;font-weight:800;letter-spacing:.18em;color:#F5F1E8}
.foot__line{margin-top:9px;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.16em;color:var(--rock)}
.foot__line .mono{color:var(--gold)}
.foot__note{margin-top:14px;max-width:30ch;font-size:.88rem;line-height:1.7;color:#93A2B1}
.foot__col{min-width:0}
.foot__label{margin-bottom:12px;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.2em;color:var(--gold)}
.foot__list{display:grid;gap:10px}
.foot__link{
  display:inline-block;text-decoration:none;color:#C3CFDA;font-size:.92rem;letter-spacing:.02em;
  padding-bottom:2px;border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.foot__link:hover{color:var(--gold-lift);border-bottom-color:rgba(200,162,74,.6)}
.foot__kv{font-size:.86rem;line-height:1.7;color:#A9B7C5;word-break:break-word}
.foot__mono{font-family:var(--font-mono);font-size:.82rem;letter-spacing:.04em;color:#E0E7EE}
.foot__legal{
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;align-items:baseline;
  max-width:1180px;margin:clamp(26px,4vw,46px) auto 0;
  padding-top:16px;border-top:1px solid var(--line-soft);
  font-size:.76rem;color:var(--rock);
}
.foot__icp{font-family:var(--font-mono);letter-spacing:.08em;color:#8B9AA8}
.foot__copy{letter-spacing:.04em}
.foot__copy .mono{color:#8B9AA8}

/* ---------- layout / shared components ---------- */
#main-content{display:block;scroll-margin-top:76px}
.container{width:100%;max-width:1180px;margin-inline:auto;padding-inline:var(--gutter)}
.panel-paper{background:var(--paper);color:var(--ink);border:1px solid rgba(11,27,43,.1)}
.panel-paper h1,.panel-paper h2,.panel-paper h3{color:var(--ink)}
.panel-paper .h-display{color:var(--ink)}
.panel-paper p{color:#243748}

.section-head{display:grid;gap:8px;margin-bottom:clamp(20px,3vw,32px);padding-top:16px;border-top:1px solid var(--line)}
.section-head__num{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.26em;color:var(--gold)}
.section-head__title{font-size:clamp(1.35rem,2.3vw,1.95rem);font-weight:800;letter-spacing:.03em;color:#F3EEE4}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  min-height:44px;padding:0 22px;
  border:1px solid var(--gold);background:transparent;color:var(--gold-lift);
  font-weight:700;font-size:.92rem;letter-spacing:.1em;text-decoration:none;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.btn:hover{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.btn--gold{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.btn--gold:hover{background:var(--gold-lift);border-color:var(--gold-lift);color:var(--ink)}
.btn--ghost{border-color:rgba(217,226,231,.34);color:#DCE4EC}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold-lift);background:rgba(200,162,74,.1)}
.btn--quiet{border-color:transparent;min-height:0;padding:0;color:var(--gold-lift);text-decoration:underline;text-underline-offset:6px;letter-spacing:.04em}
.btn--quiet:hover{background:transparent;color:#FFF8E6}
.panel-paper .btn{border-color:var(--ink);color:var(--ink)}
.panel-paper .btn:hover{background:var(--ink);color:var(--paper)}
.panel-paper .btn--gold{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.panel-paper .btn--ghost{border-color:rgba(11,27,43,.32);color:var(--ink)}

.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:4px 10px;border:1px solid currentColor;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--rock);
}
.tag--gold{color:var(--gold)}
.tag--amber{color:var(--amber)}
.tag--celadon{color:var(--celadon)}
.tag--terracotta{color:var(--terracotta)}
.panel-paper .tag{color:#41556A}
.panel-paper .tag--celadon{color:#3E6A57}

.card{
  position:relative;padding:22px 22px 24px;
  background:var(--ink-2);border:1px solid var(--line);
  transition:border-color .24s var(--ease),background .24s var(--ease);
}
.card::after{content:"";position:absolute;right:0;top:0;width:14px;height:1px;background:var(--line-gold)}
.card:hover{border-color:rgba(200,162,74,.55);background:#142F4C}
.card__head{margin-bottom:6px;font-size:1.04rem;font-weight:700;letter-spacing:.02em;color:#F3EEE4}
.card__meta{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;color:var(--rock)}

.media{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line);
  background-image:
    repeating-linear-gradient(90deg,rgba(217,226,231,.06) 0 1px,transparent 1px 26px),
    linear-gradient(135deg,rgba(200,162,74,.22),rgba(11,27,43,.92) 46%,rgba(95,143,122,.24));
  background-color:var(--ink-2);
}
.media__img{width:100%;height:100%;object-fit:cover;display:block}
.media__caption{
  position:absolute;left:12px;bottom:10px;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;
  color:rgba(243,238,228,.82);
}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
@media (max-width:600px){.media--wide{aspect-ratio:16/10}}

.grid-2,.grid-3,.grid-auto{display:grid;gap:clamp(16px,2.2vw,28px);grid-template-columns:1fr}
@media (min-width:720px){
  .grid-2{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:1024px){
  .grid-3{grid-template-columns:repeat(3,1fr)}
}
.grid-auto{grid-template-columns:repeat(auto-fill,minmax(238px,1fr))}

.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:16px 0;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;color:var(--rock);
}
.crumbs__link{text-decoration:none;color:#9FB0BF;transition:color .2s var(--ease)}
.crumbs__link:hover{color:var(--gold-lift)}
.crumbs__sep{opacity:.45}

.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{
  min-height:44px;padding:0 16px;
  border:1px solid rgba(217,226,231,.22);
  color:#B9C6D3;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.filter-btn:hover{border-color:var(--gold);color:var(--gold-lift)}
.filter-btn[aria-pressed="true"]{border-color:var(--celadon);color:#DCEDE4;background:rgba(95,143,122,.2)}
.filter-empty{padding:24px;border:1px dashed var(--line);font-size:.9rem;color:#8B9AA8}
.is-filtered-out{display:none !important}

html.js-reveal [data-reveal]{opacity:0;transform:translateY(14px)}
html.js-reveal [data-reveal].is-visible{opacity:1;transform:none}
[data-reveal]{transition:opacity .52s var(--ease),transform .52s var(--ease)}

.backtop{
  position:fixed;right:18px;bottom:18px;z-index:65;
  width:48px;height:48px;display:grid;place-items:center;
  border:1px solid rgba(200,162,74,.5);
  background:rgba(11,27,43,.94);color:var(--gold-lift);
  font-family:var(--font-mono);font-size:.62rem;letter-spacing:.12em;
  opacity:0;pointer-events:none;
  transition:opacity .28s var(--ease),border-color .2s var(--ease);
}
.backtop[data-visible="true"]{opacity:1;pointer-events:auto}
.backtop:hover{border-color:var(--gold-lift);color:#FFF8E6}

body.is-nav-open{overflow:hidden}

/* ---------- responsive shell ---------- */
@media (min-width:720px){
  .topbar__tag{display:flex;align-items:center;gap:9px;font-size:.8rem;letter-spacing:.14em;color:#9FB0BF}
  .topbar__tag .mono{font-size:.66rem;letter-spacing:.2em}
}
@media (min-width:760px){
  .foot__grid{grid-template-columns:1.35fr 1fr 1.25fr}
  .foot__col{padding-left:clamp(16px,2vw,28px);border-left:1px solid var(--line-soft)}
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .rail{
    transform:none;width:var(--rail-w);
    padding:26px 22px 22px;
    box-shadow:none;
    border-right:1px solid var(--line-gold);
  }
  .nav-toggle{display:none}
  .nav-scrim{display:none}
  .topbar__brand{display:none}
  .topbar__tag{margin-right:auto}
  .backtop{right:26px;bottom:26px}
}
@media (min-width:1280px){
  :root{--rail-w:300px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  html.js-reveal [data-reveal]{opacity:1;transform:none}
  .site-head[data-open="true"] .nav-toggle__bar:nth-child(1),
  .site-head[data-open="true"] .nav-toggle__bar:nth-child(3){transform:none}
}