*,*::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{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
summary{list-style:none}
summary::-webkit-details-marker{display:none}

:root{
  --ink-900:#05101A;
  --ink-800:#0A1D2B;
  --ink-700:#12303F;
  --line:#1F4C5E;
  --text:#F4F7F9;
  --text-muted:#A7BAC6;
  --coral:#F26B3A;
  --coral-soft:#FF9166;
  --mint:#3FF0C0;
  --violet:#7B6CF6;
  --amber:#E8B44C;
  --paper:#EDE7DC;
  --font-display:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Noto Sans SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
  --header-h:76px;
  --wrap:1240px;
  --gutter:clamp(20px,4vw,56px);
}

body{
  position:relative;
  min-height:100vh;
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  background:
    radial-gradient(120% 78% at 92% -12%,rgba(242,107,58,.17),transparent 62%),
    radial-gradient(90% 70% at 2% 6%,rgba(63,240,192,.10),transparent 64%),
    linear-gradient(178deg,var(--ink-900) 0%,var(--ink-800) 54%,var(--ink-900) 100%);
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.2;
  background-image:
    repeating-linear-gradient(to right,rgba(31,76,94,.55) 0 1px,transparent 1px 24px),
    repeating-linear-gradient(to bottom,rgba(31,76,94,.55) 0 1px,transparent 1px 24px);
}
body>*{position:relative;z-index:1}

:focus-visible{outline:2px solid var(--mint);outline-offset:3px}

.mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;text-transform:uppercase}
.eyebrow{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--coral-soft)}
.annotation{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--text-muted);writing-mode:vertical-rl;text-orientation:mixed}
.display-xl{font-family:var(--font-display);font-weight:800;font-size:clamp(2.5rem,6.4vw,4.5rem);line-height:1.06;letter-spacing:-.02em}
.display-lg{font-family:var(--font-display);font-weight:800;font-size:clamp(2rem,4vw,3rem);line-height:1.1;letter-spacing:-.02em}

.container{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.stack{display:flex;flex-direction:column;gap:clamp(16px,2.4vw,28px)}
.grid{display:grid;gap:clamp(20px,3vw,40px)}
.grid--split{grid-template-columns:62fr 38fr}
.divider{height:1px;border:0;background:var(--line)}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;border:1px solid transparent;border-radius:2px;
  font-size:14px;font-weight:600;letter-spacing:.02em;
  transition:background .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease),transform .24s var(--ease);
}
.btn--primary{background:var(--coral);color:var(--ink-900)}
.btn--primary:hover{background:var(--coral-soft);transform:translateY(-2px)}
.btn--ghost{border-color:var(--line);color:var(--text)}
.btn--ghost:hover{border-color:var(--coral);color:var(--coral-soft)}

.card,.panel{
  border:1px solid var(--line);
  border-radius:2px;
  background:linear-gradient(180deg,rgba(18,48,63,.82),rgba(10,29,43,.82));
  padding:clamp(18px,2.6vw,30px);
}
.card--paper{background:var(--paper);color:var(--ink-900);border-color:#cfc7b8}

.tag{
  display:inline-block;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  padding:4px 9px;border:1px solid var(--line);color:var(--text-muted);border-radius:1px;
}
.status-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 3px rgba(63,240,192,.18);vertical-align:middle}
.status-dot--amber{background:var(--amber);box-shadow:0 0 0 3px rgba(232,180,76,.18)}

.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted);border-bottom:1px solid transparent}
.breadcrumb a:hover{color:var(--coral-soft);border-bottom-color:var(--coral-soft)}
.breadcrumb__sep{color:var(--line)}

.media-frame{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:2px;background:var(--ink-700)}
.media-frame__img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__tag{
  position:absolute;left:0;bottom:0;
  padding:6px 12px;background:var(--ink-900);color:var(--amber);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
}

[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(5,16,26,.82);
  backdrop-filter:blur(14px) saturate(120%);
  -webkit-backdrop-filter:blur(14px) saturate(120%);
  border-bottom:1px solid var(--line);
  transition:background .3s var(--ease),border-color .3s var(--ease);
}
.site-header.is-condensed{background:rgba(5,16,26,.96);border-bottom-color:rgba(242,107,58,.42)}
.site-header__inner{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;
  gap:clamp(16px,3vw,48px);
  transition:min-height .3s var(--ease);
}
.site-header.is-condensed .site-header__inner{min-height:56px}

.skip-link{
  position:absolute;left:var(--gutter);top:8px;z-index:200;
  transform:translateY(-180%);
  padding:10px 18px;background:var(--coral);color:var(--ink-900);
  font-size:13px;font-weight:600;letter-spacing:.02em;border-radius:2px;
  transition:transform .2s var(--ease);
}
.skip-link:focus-visible{transform:none}

.scroll-progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(31,76,94,.45);pointer-events:none}
.scroll-progress__bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--coral),var(--amber));transition:width .12s linear}

.brand{display:flex;align-items:center;gap:12px;padding-block:10px;flex:0 0 auto}
.brand__mark{
  width:8px;height:28px;border-radius:1px;
  background:linear-gradient(180deg,var(--coral),var(--coral-soft));
  box-shadow:0 0 18px rgba(242,107,58,.55);
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--text)}
.brand__meta{font-size:10.5px;letter-spacing:.1em;color:var(--text-muted);margin-top:3px}

.site-header__trail{display:flex;align-items:center;gap:clamp(10px,2vw,28px)}

.header-nav{display:flex;align-items:center;gap:clamp(12px,2vw,30px)}
.nav-list{display:flex;align-items:center;gap:clamp(4px,1.4vw,18px)}
.nav-link{
  position:relative;display:inline-block;
  padding:8px 4px;
  font-size:14px;font-weight:500;color:var(--text-muted);
  transition:color .24s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--coral);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .28s var(--ease);
}
.nav-link:hover{color:var(--text)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--text)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.version-switch{position:relative;flex:0 0 auto}
.version-switch__summary{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 15px;border-radius:2px;
  background:var(--coral);color:var(--ink-900);
  font-size:13px;font-weight:600;letter-spacing:.02em;
  cursor:pointer;
  transition:background .24s var(--ease),transform .24s var(--ease);
}
.version-switch__summary:hover{background:var(--coral-soft);transform:translateY(-1px)}
.version-switch__summary::after{
  content:"";width:6px;height:6px;
  border-right:2px solid currentColor;border-bottom:2px solid currentColor;
  transform:rotate(45deg) translateY(-2px);
  transition:transform .24s var(--ease);
}
.version-switch[open] .version-switch__summary::after{transform:rotate(-135deg) translateY(-2px)}
.version-switch__panel{
  position:absolute;right:0;top:calc(100% + 12px);z-index:80;
  width:268px;
  display:grid;gap:6px;
  padding:16px;
  background:var(--ink-700);
  border:1px solid var(--line);
  border-left:3px solid var(--coral);
  border-radius:2px;
  box-shadow:0 28px 52px -22px rgba(0,0,0,.9);
}
.version-switch__note{font-size:10.5px;letter-spacing:.12em;color:var(--amber);margin-bottom:4px}
.version-switch__link{
  display:block;padding:8px 10px;
  font-size:13.5px;color:var(--text-muted);
  border:1px solid transparent;border-radius:1px;
  transition:color .24s var(--ease),border-color .24s var(--ease),background .24s var(--ease);
}
.version-switch__link:hover{color:var(--mint);border-color:var(--line);background:rgba(5,16,26,.5)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:10px 13px;
  border:1px solid var(--line);border-radius:2px;
  color:var(--text);font-size:13px;letter-spacing:.04em;
  transition:border-color .24s var(--ease),color .24s var(--ease);
}
.nav-toggle:hover{border-color:var(--coral);color:var(--coral-soft)}
.nav-toggle[aria-expanded="true"]{border-color:var(--coral);color:var(--coral-soft)}
.nav-toggle__bar{width:16px;height:2px;background:currentColor;box-shadow:0 5px 0 currentColor,0 -5px 0 currentColor;transition:transform .24s var(--ease),box-shadow .24s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar{box-shadow:none;transform:rotate(45deg)}
.nav-toggle__label{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,128px);
  background:linear-gradient(180deg,rgba(10,29,43,.55),rgba(5,16,26,.98) 72%);
  border-top:1px solid var(--line);
}
.footer-status{
  max-width:var(--wrap);margin-inline:auto;
  padding:14px var(--gutter);
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 36px;
  border-bottom:1px solid rgba(31,76,94,.7);
}
.footer-status__item{display:flex;align-items:baseline;gap:10px}
.footer-status__label{font-size:10.5px;letter-spacing:.14em;color:var(--text-muted)}
.footer-status__value{font-size:12px;letter-spacing:.1em;color:var(--amber)}
.footer-status__value--live{color:var(--mint)}
.footer-status__value--quiet{color:var(--text-muted)}

.footer-grid{
  max-width:var(--wrap);margin-inline:auto;
  padding:clamp(38px,6vw,72px) var(--gutter) clamp(26px,4vw,44px);
  display:grid;gap:clamp(28px,4vw,56px);
  grid-template-columns:1.15fr 1fr .85fr;
}
.footer-brand__name{font-family:var(--font-display);font-weight:800;font-size:23px;letter-spacing:-.02em}
.footer-tagline{margin-top:12px;max-width:24ch;font-size:15px;color:var(--text-muted)}
.footer-brand__note{
  margin-top:22px;font-size:10.5px;letter-spacing:.14em;color:var(--line);
  padding-left:14px;border-left:2px solid var(--coral);
}
.footer-links{display:flex;flex-wrap:wrap;gap:clamp(24px,3vw,44px);border-left:1px solid rgba(31,76,94,.7);padding-left:clamp(20px,3vw,40px)}
.footer-link-group{display:flex;flex-direction:column;gap:2px;min-width:110px}
.footer-link-group__title{
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--coral-soft);
  margin-bottom:10px;
}
.footer-link{
  display:block;padding:5px 0;
  font-size:14.5px;color:var(--text-muted);
  border-bottom:1px solid transparent;
  transition:color .24s var(--ease),border-color .24s var(--ease),padding-left .24s var(--ease);
}
.footer-link:hover{color:var(--text);border-bottom-color:var(--line);padding-left:6px}
.footer-contact__title{
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--coral-soft);
  margin-bottom:14px;
}
.footer-contact__line{font-size:12px;letter-spacing:.08em;color:var(--amber);margin-bottom:6px}
.footer-contact__meta{margin-top:12px;font-size:13px;line-height:1.7;color:var(--text-muted);max-width:32ch}
.footer-contact__meta--addr{padding-top:12px;border-top:1px dashed var(--line);color:rgba(167,186,198,.82)}
.footer-contact__cta{
  display:inline-block;margin-top:16px;
  font-size:13px;font-weight:600;color:var(--coral-soft);
  border-bottom:1px solid var(--coral-soft);padding-bottom:2px;
  transition:color .24s var(--ease),border-color .24s var(--ease);
}
.footer-contact__cta:hover{color:var(--text);border-color:var(--text)}

.footer-legal{
  max-width:var(--wrap);margin-inline:auto;
  padding:18px var(--gutter) 26px;
  border-top:1px solid rgba(31,76,94,.7);
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 24px;
}
.footer-legal__copy{font-size:10.5px;letter-spacing:.1em;color:var(--text-muted);text-transform:none}
.footer-legal__list{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal__link{font-size:12px;color:var(--text-muted);border-bottom:1px solid transparent;transition:color .24s var(--ease),border-color .24s var(--ease)}
.footer-legal__link:hover{color:var(--text);border-color:var(--line)}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:1 / -1}
  .footer-links{border-left:0;padding-left:0}
}
@media (max-width:900px){
  .site-header__inner{min-height:56px}
  .nav-toggle{display:inline-flex}
  .header-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;
    flex-direction:column;align-items:stretch;gap:0;
    padding:10px var(--gutter) 22px;
    background:rgba(10,29,43,.985);
    border-bottom:1px solid var(--line);
    box-shadow:0 30px 60px -30px rgba(0,0,0,.9);
    max-height:calc(100vh - 56px);overflow-y:auto;
  }
  .header-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    display:block;padding:14px 2px;
    font-size:15px;
    border-bottom:1px solid rgba(31,76,94,.6);
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{
    color:var(--coral-soft);
    padding-left:14px;
    box-shadow:inset 3px 0 0 var(--coral);
  }
  .version-switch{margin-top:16px;align-self:stretch}
  .version-switch__summary{width:100%;justify-content:space-between}
  .version-switch__panel{position:static;width:auto;margin-top:8px;box-shadow:none}
  .grid--split{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-contact{grid-column:auto}
}
@media (max-width:600px){
  .brand__name{font-size:18px}
  .brand__meta{font-size:9.5px;letter-spacing:.08em}
  .footer-status{gap:8px 18px}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .footer-legal__list{gap:16px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .nav-link:hover::after{transform:scaleX(1)}
}