:root{
  --ink-950:#05080C;
  --ink-900:#0B1524;
  --panel:#122032;
  --line:#1D2E44;
  --amber:#F6A81C;
  --amber-soft:#FFD07A;
  --steel:#9AA9BC;
  --paper:#F4F1E9;
  --muted:#3A4A5F;

  --font-sans:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --shell:1320px;
  --pad:clamp(16px,4vw,40px);
  --header-h:68px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd,pre{margin:0}
ul,ol{padding:0}
ul[class],ol[class]{list-style:none}
img,svg,video{max-width:100%}
img{height:auto;display:block}
a{color:inherit}
button{font:inherit;color:inherit}
hr{border:0;border-top:1px solid var(--line);margin:0}

:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{
  outline:2px solid var(--amber);
  outline-offset:3px;
}

body{
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(ellipse 900px 420px at 50% -8%,rgba(246,168,28,.09),transparent 68%),
    linear-gradient(90deg,rgba(29,46,68,.34) 1px,transparent 1px),
    linear-gradient(180deg,rgba(29,46,68,.22) 1px,transparent 1px);
  background-size:auto,88px 88px,88px 88px;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

#main-content{outline:none}

h1,.h1{font-size:clamp(26px,3.6vw,32px);line-height:1.32;font-weight:800;letter-spacing:-.02em}
h2,.h2{font-size:clamp(20px,2.6vw,24px);line-height:1.42;font-weight:800;letter-spacing:-.02em}
h3,.h3{font-size:18px;line-height:1.56;font-weight:700;letter-spacing:-.01em}
.display{font-size:clamp(32px,5.2vw,44px);line-height:1.16;font-weight:800;letter-spacing:-.02em}
.lead{font-size:clamp(15px,1.5vw,17px);line-height:1.85;color:var(--steel);max-width:62ch}
.prose{max-width:68ch}
.prose p{margin-bottom:1em}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--paper);font-weight:700}
.prose em{color:var(--amber-soft);font-style:normal}

.mono{font-family:var(--font-mono);font-size:13px;line-height:1.55;letter-spacing:.08em;font-variant-numeric:tabular-nums}
.idx{font-family:var(--font-mono);font-size:12px;line-height:1.6;letter-spacing:.1em;color:var(--amber);font-variant-numeric:tabular-nums}

.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad)}

.section{position:relative;padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(32px,4vw,56px)}
.section__head{display:grid;gap:12px;max-width:760px;margin-bottom:clamp(24px,3.4vw,44px)}
.section__kicker{display:flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12px;line-height:1.6;letter-spacing:.14em;color:var(--amber)}
.section__kicker::before{content:"";width:22px;height:1px;background:var(--amber);flex:none}
.section__title{font-size:clamp(22px,3vw,32px);line-height:1.32;font-weight:800;letter-spacing:-.02em;color:var(--paper)}
.section__lead{font-size:15px;line-height:1.85;color:var(--steel);max-width:62ch}

.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--wide-narrow{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--narrow-wide{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:12px 22px;border:1px solid transparent;border-radius:0;
  font-family:var(--font-sans);font-size:15px;font-weight:700;line-height:1.2;letter-spacing:.01em;
  text-decoration:none;cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn--amber{background:var(--amber);color:var(--ink-950)}
.btn--amber:hover{background:var(--amber-soft)}
.btn--ghost{background:transparent;color:var(--paper);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber)}
.btn--sm{padding:8px 14px;font-size:13px}
.btn[disabled],.btn[aria-disabled="true"]{opacity:.45;cursor:not-allowed}

.card{position:relative;background:var(--panel);border:1px solid var(--line);padding:clamp(16px,2.2vw,24px)}
.card--flush{padding:0;overflow:hidden}
.card--accent{border-color:rgba(246,168,28,.5);box-shadow:inset 3px 0 0 var(--amber)}
.card__kicker{display:flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;line-height:1.6;letter-spacing:.12em;color:var(--steel)}
.card__title{margin-top:8px;font-size:18px;line-height:1.5;font-weight:700;color:var(--paper);letter-spacing:-.01em}
.card__body{margin-top:8px;font-size:14px;line-height:1.85;color:var(--steel)}

.tag{
  display:inline-flex;align-items:center;gap:6px;padding:3px 8px;
  border:1px solid var(--line);border-radius:0;
  font-family:var(--font-mono);font-size:11px;line-height:1.6;letter-spacing:.1em;
  color:var(--steel);white-space:nowrap;
}
.tag--amber{color:var(--amber);border-color:rgba(246,168,28,.45);background:rgba(246,168,28,.08)}

.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:16px;border-bottom:1px solid rgba(29,46,68,.7);
  font-family:var(--font-mono);font-size:12px;line-height:1.6;letter-spacing:.08em;color:var(--steel);
}
.crumbs a{color:var(--steel);text-decoration:none;transition:color .16s ease}
.crumbs a:hover{color:var(--amber)}
.crumbs__sep{color:var(--muted);user-select:none}
.crumbs [aria-current="page"]{color:var(--paper)}

.media{
  position:relative;display:block;overflow:hidden;
  background:var(--panel);border:1px solid var(--line);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(5,8,12,0) 42%,rgba(5,8,12,.76) 100%);
}
.media img,.media__img{display:block;width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.06)}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--wide{aspect-ratio:21/9}
.media__placeholder{
  display:grid;place-items:center;min-height:160px;height:100%;
  background-image:
    linear-gradient(90deg,rgba(29,46,68,.55) 1px,transparent 1px),
    linear-gradient(180deg,rgba(29,46,68,.55) 1px,transparent 1px);
  background-size:32px 32px;
  font-family:var(--font-mono);font-size:12px;line-height:1.6;letter-spacing:.12em;color:var(--muted);
}
.media__cap{
  position:absolute;left:0;bottom:0;z-index:1;
  padding:10px 14px;font-family:var(--font-mono);font-size:11px;line-height:1.6;letter-spacing:.1em;color:var(--steel);
}

.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:clamp(20px,3vw,32px)}
.filter-chip{
  appearance:none;background:transparent;border:1px solid var(--line);border-radius:0;
  color:var(--steel);font-family:var(--font-mono);font-size:12px;line-height:1.6;letter-spacing:.12em;
  padding:8px 14px;cursor:pointer;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.filter-chip:hover{color:var(--paper);border-color:var(--steel)}
.filter-chip[aria-pressed="true"]{color:var(--amber);border-color:var(--amber);background:rgba(246,168,28,.1)}
.filter-item{animation:filterIn .18s ease both}
.filter-item[hidden]{display:none!important}
.filter-empty{padding:24px 0;font-family:var(--font-mono);font-size:13px;line-height:1.7;letter-spacing:.08em;color:var(--steel)}
@keyframes filterIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

.js-ready .reveal{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
.js-ready .reveal.is-in{opacity:1;transform:none}

.skip-link{
  position:absolute;left:12px;top:-64px;z-index:200;
  display:inline-block;padding:10px 16px;
  background:var(--amber);color:var(--ink-950);
  font-size:14px;font-weight:700;text-decoration:none;border-radius:0;
  transition:top .18s ease;
}
.skip-link:focus{top:8px}

/* ---------- status bar ---------- */
.status-bar{position:relative;z-index:50;background:var(--ink-950);border-bottom:1px solid var(--line);color:var(--steel)}
.status-bar__inner{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--pad);height:36px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.status-bar__meta{
  display:flex;align-items:center;gap:10px;min-width:0;
  font-size:12px;line-height:1.5;letter-spacing:.02em;white-space:nowrap;
}
.status-bar__meta--end{justify-content:flex-end}
.status-bar__pulse{
  width:6px;height:6px;flex:none;background:var(--amber);
  animation:pulseDot 2.4s ease-in-out infinite;
}
@keyframes pulseDot{
  0%,100%{opacity:.5;box-shadow:0 0 0 0 rgba(246,168,28,.45)}
  50%{opacity:1;box-shadow:0 0 0 4px rgba(246,168,28,0)}
}
.status-bar__code{color:var(--amber);font-size:11px}
.status-bar__divider{width:1px;height:12px;flex:none;background:var(--line)}
.status-bar__section{
  color:var(--paper);font-weight:500;overflow:hidden;text-overflow:ellipsis;
}
.status-bar__summary{color:var(--amber-soft);font-size:11px}
.status-bar__summary:empty{display:none}
.status-bar__clock{color:var(--steel);font-size:11px}
.status-bar__progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none}
.status-bar__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--amber),var(--amber-soft));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .1s linear;
}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:40;
  background:rgba(5,8,12,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:box-shadow .2s ease;
}
.site-header[data-stuck]{box-shadow:0 18px 40px -32px #000,0 1px 0 rgba(29,46,68,.9)}
.site-header__inner{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--pad);min-height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(16px,3vw,40px);
}

.brand{display:flex;align-items:center;gap:12px;flex:none;padding-block:10px;text-decoration:none;color:var(--paper)}
.brand__glyph{display:block;flex:none;color:var(--amber);transition:color .18s ease}
.brand:hover .brand__glyph{color:var(--amber-soft)}
.brand__body{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand__row{display:flex;align-items:baseline;gap:10px}
.brand__name{font-size:19px;font-weight:800;line-height:1.2;letter-spacing:-.02em;white-space:nowrap}
.brand__version{
  font-family:var(--font-mono);font-size:11px;line-height:1.5;letter-spacing:.12em;
  color:var(--amber);border:1px solid rgba(246,168,28,.45);padding:1px 6px;white-space:nowrap;
}
.brand__tagline{
  font-family:var(--font-mono);font-size:11px;line-height:1.6;letter-spacing:.14em;
  color:var(--steel);white-space:nowrap;
}

.primary-nav{display:flex;align-items:center;gap:clamp(18px,2.4vw,34px);margin-left:auto}
.primary-nav__list{display:flex;align-items:center;gap:clamp(14px,1.8vw,26px)}
.primary-nav__item{flex:none}
.primary-nav__link{
  position:relative;display:block;padding:6px 0;
  font-size:15px;line-height:1.45;color:var(--steel);text-decoration:none;white-space:nowrap;
  transition:color .18s ease;
}
.primary-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--amber);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .2s ease;
}
.primary-nav__link:hover,.primary-nav__link:focus-visible{color:var(--paper)}
.primary-nav__link:hover::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{color:var(--paper);font-weight:700}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.primary-nav__cta{flex:none;padding:10px 18px;font-size:14px}

.nav-toggle{
  display:none;align-items:center;gap:8px;margin-left:auto;
  background:transparent;border:1px solid var(--line);border-radius:0;
  padding:9px 12px;cursor:pointer;
  transition:border-color .18s ease;
}
.nav-toggle:hover{border-color:var(--steel)}
.nav-toggle[aria-expanded="true"]{border-color:var(--amber)}
.nav-toggle__bars{display:grid;gap:4px;width:18px;flex:none}
.nav-toggle__bars span{display:block;height:1.5px;background:var(--amber);transition:transform .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}
.nav-toggle__text{font-family:var(--font-mono);font-size:12px;line-height:1.5;letter-spacing:.12em;color:var(--steel)}

.mobile-dock{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:45;
  align-items:center;justify-content:center;gap:8px;
  height:56px;padding-bottom:env(safe-area-inset-bottom);
  background:var(--amber);color:var(--ink-950);
  font-size:15px;font-weight:700;letter-spacing:.02em;text-decoration:none;
  transition:opacity .2s ease,transform .2s ease;
}
.mobile-dock__dot{width:6px;height:6px;background:var(--ink-950);flex:none}
body.nav-open .mobile-dock{opacity:0;transform:translateY(100%);pointer-events:none}

/* ---------- footer ---------- */
.site-footer{position:relative;overflow:hidden;background:var(--ink-950);border-top:1px solid var(--line);color:var(--steel)}
.footer-slash{
  position:absolute;top:44px;left:-5%;right:-5%;height:1px;pointer-events:none;
  background:linear-gradient(90deg,transparent,rgba(246,168,28,.45),transparent);
  transform:rotate(-1.6deg);
}
.site-footer__inner{
  position:relative;width:100%;max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--pad);padding-block:clamp(48px,6vw,72px) clamp(24px,3vw,36px);
}
.site-footer__grid{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) repeat(3,minmax(0,.65fr));
  gap:clamp(28px,4vw,64px);
  padding-top:clamp(24px,3.4vw,40px);
}
.site-footer__brand{min-width:0}
.footer-logo{
  display:flex;align-items:baseline;gap:10px;
  font-size:20px;font-weight:800;line-height:1.3;letter-spacing:-.02em;color:var(--paper);
}
.footer-logo__version{
  font-family:var(--font-mono);font-size:11px;line-height:1.5;letter-spacing:.12em;
  color:var(--amber);border:1px solid rgba(246,168,28,.45);padding:1px 6px;
}
.footer-blurb{margin-top:14px;font-size:14px;line-height:1.85;color:var(--steel);max-width:34ch}
.footer-blurb--note{
  margin-top:10px;font-family:var(--font-mono);font-size:12px;line-height:1.7;
  letter-spacing:.06em;color:rgba(246,168,28,.8);
}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;align-items:center;gap:8px;margin-bottom:14px;
  font-family:var(--font-mono);font-size:12px;line-height:1.6;letter-spacing:.14em;color:var(--paper);
}
.footer-col__title::before{content:"";width:14px;height:1px;flex:none;background:var(--amber)}
.footer-col__list{display:grid;gap:8px;margin:0;padding:0;list-style:none}
.footer-link{
  display:inline-block;font-size:14px;line-height:1.7;color:var(--steel);text-decoration:none;
  transition:color .16s ease,transform .16s ease;
}
.footer-link:hover{color:var(--amber);transform:translateX(2px)}

.site-footer__contact{
  margin-top:clamp(32px,5vw,56px);padding-top:24px;
  border-top:1px solid var(--line);
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:20px 32px;
}
.footer-contact__item{display:flex;flex-direction:column;align-items:flex-start;gap:5px;min-width:0}
.footer-contact__label{
  font-family:var(--font-mono);font-size:11px;line-height:1.6;letter-spacing:.14em;color:var(--steel);opacity:.75;
}
.footer-contact__value{font-size:14px;line-height:1.7;color:var(--paper);word-break:break-word}
.footer-contact__note{font-size:13px;line-height:1.75;color:var(--steel);max-width:44ch}
.footer-contact__item--note{grid-column:span 1}
.footer-copy{
  margin-top:4px;background:transparent;border:1px solid var(--line);border-radius:0;
  color:var(--steel);font-family:var(--font-mono);font-size:11px;line-height:1.6;letter-spacing:.12em;
  padding:6px 10px;cursor:pointer;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.footer-copy:hover{color:var(--amber);border-color:var(--amber)}
.footer-copy[data-copied]{color:var(--amber);border-color:var(--amber);background:rgba(246,168,28,.08)}

.site-footer__legal{
  margin-top:clamp(24px,3vw,36px);padding-top:20px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  font-family:var(--font-mono);font-size:12px;line-height:1.7;letter-spacing:.06em;color:var(--steel);
}
.footer-legal__icp{color:var(--steel)}
.footer-legal__note{color:var(--muted);-webkit-text-fill-color:currentColor}
.footer-legal__note [data-year]{color:var(--amber-soft)}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .primary-nav__link{font-size:14px}
  .primary-nav__link[aria-current="page"]{font-weight:700}
}

@media (max-width:1024px){
  .grid--wide-narrow,.grid--narrow-wide{grid-template-columns:minmax(0,1fr)}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__brand{grid-column:1 / -1}
}

@media (max-width:960px){
  :root{--header-h:60px}
  .nav-toggle{display:inline-flex}
  .site-header__inner{gap:12px}
  .primary-nav{
    position:fixed;left:0;right:0;bottom:0;z-index:60;
    display:flex;flex-direction:column;align-items:stretch;gap:0;margin-left:0;
    max-height:min(78vh,560px);overflow-y:auto;
    padding:8px var(--pad) calc(84px + env(safe-area-inset-bottom));
    background:var(--ink-950);
    border-top:1px solid var(--line);
    box-shadow:0 -24px 60px -30px #000;
    transform:translateY(102%);
    visibility:hidden;
    transition:transform .28s cubic-bezier(.4,0,.2,1),visibility .28s ease;
  }
  .primary-nav[data-open]{transform:translateY(0);visibility:visible}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .primary-nav__item{border-bottom:1px solid var(--line)}
  .primary-nav__item:first-child{border-top:1px solid var(--line)}
  .primary-nav__link{padding:14px 2px;font-size:16px;color:var(--paper)}
  .primary-nav__link::after{display:none}
  .primary-nav__link[aria-current="page"]{color:var(--amber)}
  .primary-nav__link[aria-current="page"]::before{
    content:"";display:inline-block;width:3px;height:12px;margin-right:10px;
    background:var(--amber);vertical-align:-1px;
  }
  .primary-nav__cta{width:100%;height:48px;margin-top:18px;font-size:15px}
  .mobile-dock{display:flex}
  .site-footer__legal{padding-bottom:8px}
  .status-bar__clock{display:none}
}

@media (max-width:860px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:640px){
  body{font-size:15px;background-size:auto,64px 64px,64px 64px}
  .brand__tagline{display:none}
  .brand__name{font-size:17px}
  .status-bar__inner{height:34px;gap:10px}
  .status-bar__section{font-size:11px}
  .status-bar__summary{font-size:10px}
  .site-footer__grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .site-footer__contact{grid-template-columns:minmax(0,1fr)}
  .site-footer__legal{flex-direction:column;align-items:flex-start;gap:6px}
  .footer-blurb{max-width:none}
  .section__head{margin-bottom:24px}
  .crumbs{font-size:11px;letter-spacing:.06em}
}

@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 .reveal{opacity:1;transform:none}
  .status-bar__pulse{box-shadow:none}
  .status-bar__bar{transition:none}
}