*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:132px}
body{margin:0}
h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
:where(a,button,summary,input,select,textarea){-webkit-tap-highlight-color:transparent}

:root{
  --abyss-navy:#061A2B;
  --deep-teal:#0B3B4A;
  --midnight-indigo:#1B1B4B;
  --neon-cyan:#39E6F2;
  --electric-aqua:#7FF7F0;
  --coral-orange:#FF7A4D;
  --wine-red:#5A1F35;
  --scoreboard-ivory:#F4F7F5;
  --ink-navy:#0A1620;
  --slate-line:#2A4650;
  --warning-amber:#FFC857;
  --mist-cyan:#C9F4F2;

  --bg-deep:var(--abyss-navy);
  --bg-panel:var(--deep-teal);
  --text-on-dark:var(--scoreboard-ivory);
  --text-muted:var(--mist-cyan);
  --text-on-light:var(--ink-navy);
  --line:var(--slate-line);
  --focus-ring:var(--neon-cyan);

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

  --wrap:1180px;
  --gutter:clamp(16px,4vw,40px);
  --radius-panel:16px;
  --radius-sm:10px;
  --radius-pill:999px;
  --shadow-panel:0 18px 40px -26px rgba(0,0,0,.9);
  --shadow-lift:0 26px 54px -22px rgba(0,0,0,.92);
  --ease:cubic-bezier(.22,.61,.36,1);
}

body{
  font-family:var(--font-display);
  font-size:16px;
  font-weight:400;
  line-height:1.8;
  letter-spacing:.01em;
  color:var(--text-on-dark);
  background:var(--bg-deep);
  min-height:100vh;
}
h1,h2,h3,h4{font-weight:900;line-height:1.18;letter-spacing:-.02em;text-wrap:balance}
h1{font-size:clamp(32px,4.4vw,56px)}
h2{font-size:clamp(24px,2.6vw,38px)}
h3{font-size:clamp(19px,1.7vw,24px);letter-spacing:-.01em}
h4{font-size:17px;letter-spacing:0}
p{text-wrap:pretty}
::selection{background:var(--neon-cyan);color:var(--ink-navy)}

:focus-visible{outline:2px solid var(--focus-ring);outline-offset:2px;border-radius:4px}
:focus:not(:focus-visible){outline:none}

.container{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}

.surface-light{
  background:var(--scoreboard-ivory);
  color:var(--text-on-light);
  --focus-ring:#0B6F79;
  --text-muted:#3C5560;
  --line:#C6D3D2;
}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:var(--gutter);top:10px;z-index:130;
  display:inline-flex;align-items:center;min-height:44px;
  padding:0 18px;border-radius:var(--radius-pill);
  background:var(--neon-cyan);color:var(--ink-navy);
  font-size:13px;font-weight:900;letter-spacing:.06em;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);outline-color:var(--coral-orange)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--abyss-navy);
  color:var(--scoreboard-ivory);
  border-bottom:1px solid var(--slate-line);
  transition:box-shadow .22s var(--ease);
}
.site-header[data-scrolled]{box-shadow:0 16px 34px -22px rgba(0,0,0,.95)}

.cmdbar{
  background:linear-gradient(100deg,var(--abyss-navy) 0%,var(--deep-teal) 66%,var(--midnight-indigo) 100%);
}
.cmdbar__inner{
  display:flex;align-items:center;gap:clamp(10px,2vw,26px);
  min-height:64px;padding-block:9px;
  transition:min-height .22s var(--ease);
}
.site-header[data-scrolled] .cmdbar__inner{min-height:54px}

.brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto;padding:4px 2px;border-radius:var(--radius-sm)}
.brand__glyph{
  width:28px;height:28px;flex:0 0 auto;
  display:grid;place-items:center;border-radius:9px;
  background:linear-gradient(140deg,var(--neon-cyan),var(--coral-orange));
  color:var(--abyss-navy);font-size:12px;line-height:1;
  box-shadow:0 6px 18px -10px rgba(57,230,242,.9);
}
.brand__text{display:block;min-width:0}
.brand__mark{display:block;font-size:17px;font-weight:900;line-height:1.1;letter-spacing:.03em;color:var(--scoreboard-ivory)}
.brand__latin{display:block;margin-top:3px;font-family:var(--font-mono);font-size:9.5px;font-weight:600;letter-spacing:.28em;color:var(--neon-cyan)}

.header-status{
  display:none;align-items:center;gap:8px;
  padding:7px 14px;border-radius:var(--radius-pill);
  border:1px solid rgba(42,70,80,.95);
  background:rgba(11,59,74,.6);
  font-size:11.5px;font-weight:600;line-height:1.2;letter-spacing:.08em;
  color:var(--mist-cyan);white-space:nowrap;
}
.header-status__sep{color:var(--slate-line)}
.header-status__muted{color:rgba(201,244,242,.7)}
.status-dot{
  width:7px;height:7px;flex:0 0 auto;border-radius:50%;
  background:var(--warning-amber);
  box-shadow:0 0 0 3px rgba(255,200,87,.16);
}

.nav-toggle{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  min-height:44px;min-width:44px;padding:0 15px;margin-left:auto;
  border:1px solid var(--slate-line);border-radius:var(--radius-pill);
  background:rgba(11,59,74,.65);color:var(--scoreboard-ivory);
  font-size:12px;font-weight:700;letter-spacing:.12em;
  transition:border-color .16s var(--ease),color .16s var(--ease),background-color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--neon-cyan);color:var(--neon-cyan)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .18s var(--ease),opacity .18s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child{transform:translateY(-3px) rotate(-45deg)}

.navstrip{
  display:block;
  background:linear-gradient(90deg,rgba(11,59,74,.96) 0%,rgba(6,26,43,.98) 58%,rgba(27,27,75,.88) 100%);
  border-top:1px solid rgba(42,70,80,.75);
}
.navstrip__inner{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  min-height:52px;padding-block:6px;
}
.nav-primary{min-width:0}
.nav-index{display:flex;align-items:center;flex-wrap:wrap;gap:2px}
.nav-index__item{display:inline-flex}
.nav-index__link{
  display:inline-flex;align-items:baseline;gap:7px;
  min-height:38px;padding:8px 12px;border-radius:9px;
  font-size:13px;font-weight:500;letter-spacing:.02em;
  color:var(--mist-cyan);
  transition:color .16s var(--ease),background-color .16s var(--ease),transform .16s var(--ease);
}
.nav-index__num{
  font-family:var(--font-mono);font-size:9.5px;font-weight:600;
  letter-spacing:.06em;color:rgba(57,230,242,.72);
  transform:translateY(-1px);
}
.nav-index__link:hover{background:rgba(57,230,242,.12);color:var(--scoreboard-ivory);transform:translateY(-1px)}
.nav-index__link[aria-current="page"]{background:var(--neon-cyan);color:var(--abyss-navy);font-weight:700}
.nav-index__link[aria-current="page"] .nav-index__num{color:rgba(6,26,43,.72)}
.nav-index__link[aria-current="page"]:hover{transform:none;background:var(--neon-cyan);color:var(--abyss-navy)}

.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.header-action{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:36px;padding:0 15px;border-radius:var(--radius-pill);
  border:1px solid var(--slate-line);
  background:rgba(6,26,43,.35);
  font-size:12.5px;font-weight:700;letter-spacing:.08em;
  color:var(--mist-cyan);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease),transform .16s var(--ease);
}
.header-action:hover{color:var(--scoreboard-ivory);border-color:var(--neon-cyan);background:rgba(57,230,242,.14);transform:translateY(-1px)}
.header-action--primary{
  background:var(--coral-orange);border-color:var(--coral-orange);color:var(--abyss-navy);
  box-shadow:0 12px 26px -18px rgba(255,122,77,.95);
}
.header-action--primary:hover{background:#FF9268;border-color:#FF9268;color:var(--abyss-navy)}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  overflow:hidden;pointer-events:none;background:transparent;
}
.scroll-progress > span{
  display:block;height:100%;width:0%;
  background:linear-gradient(90deg,var(--neon-cyan),var(--electric-aqua) 40%,var(--coral-orange));
  transition:width .1s linear;
}

/* ---------- buttons / chips / labels ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  min-height:44px;padding:0 24px;border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:14px;font-weight:700;letter-spacing:.05em;
  transition:transform .16s var(--ease),background-color .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease),box-shadow .16s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--coral-orange);color:var(--abyss-navy);box-shadow:0 16px 32px -20px rgba(255,122,77,.95)}
.btn--primary:hover{background:#FF9268}
.btn--ghost{border-color:var(--slate-line);background:rgba(11,59,74,.5);color:var(--scoreboard-ivory)}
.btn--ghost:hover{border-color:var(--neon-cyan);color:var(--neon-cyan);background:rgba(57,230,242,.1)}

.chip{
  display:inline-flex;align-items:center;gap:7px;
  min-height:36px;padding:0 15px;border-radius:var(--radius-pill);
  border:1px solid var(--slate-line);background:rgba(11,59,74,.6);
  font-size:12.5px;font-weight:500;letter-spacing:.05em;color:var(--mist-cyan);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.chip:hover{border-color:var(--neon-cyan);color:var(--scoreboard-ivory)}
.chip[aria-pressed="true"]{background:var(--neon-cyan);border-color:var(--neon-cyan);color:var(--abyss-navy);font-weight:700}

.panel-label{
  display:inline-flex;align-items:center;gap:9px;
  font-size:11px;font-weight:700;letter-spacing:.18em;
  color:var(--neon-cyan);
}
.panel-label::before{content:"";width:22px;height:1px;background:currentColor;opacity:.75}

.status-pill{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 13px;border-radius:var(--radius-pill);
  border:1px solid rgba(255,200,87,.45);background:rgba(255,200,87,.13);
  font-size:11.5px;font-weight:700;letter-spacing:.1em;color:var(--warning-amber);
}
.status-pill::before{
  content:"";width:6px;height:6px;border-radius:50%;background:currentColor;
  animation:pill-breathe 3.6s ease-in-out infinite;
}
@keyframes pill-breathe{0%,100%{opacity:.3}50%{opacity:1}}

/* ---------- panels / grids / prose ---------- */
.panel{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--slate-line);border-radius:var(--radius-panel);
  background:linear-gradient(158deg,rgba(11,59,74,.94),rgba(6,26,43,.96));
  box-shadow:var(--shadow-panel);
  transition:transform .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
@media (hover:hover){
  .panel:hover{transform:translateY(-4px);border-color:var(--neon-cyan);box-shadow:var(--shadow-lift)}
}

.grid{display:grid;gap:clamp(14px,2vw,24px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

.prose{max-width:72ch;font-size:clamp(15px,1.15vw,17px);line-height:1.88}
.prose > * + *{margin-top:1.05em}
.prose h2{margin-top:2em;font-size:clamp(22px,2.2vw,30px)}
.prose h3{margin-top:1.6em}
.prose a{text-decoration:underline;text-underline-offset:3px;color:var(--neon-cyan)}
.surface-light .prose a{color:#0B6F79}
.prose ul{list-style:disc;padding-left:1.35em}
.prose ol{list-style:decimal;padding-left:1.5em}
.prose li + li{margin-top:.5em}

.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--text-muted)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:9px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:9px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--slate-line)}
.breadcrumb a{transition:color .16s var(--ease)}
.breadcrumb a:hover{color:var(--neon-cyan)}
.breadcrumb [aria-current="page"]{color:var(--scoreboard-ivory)}
.surface-light .breadcrumb [aria-current="page"]{color:var(--ink-navy)}

/* ---------- media frames ---------- */
.media{
  position:relative;overflow:hidden;
  border:1px solid var(--slate-line);border-radius:var(--radius-panel);
  background:linear-gradient(152deg,var(--deep-teal),var(--midnight-indigo) 74%);
  box-shadow:var(--shadow-panel);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(57,230,242,.08) 0 1px,transparent 1px 14px);
  opacity:.45;
}
.media__img{display:block;width:100%;height:100%;object-fit:cover;filter:saturate(.94) contrast(1.04)}
.media__overlay{
  position:absolute;inset:0;pointer-events:none;z-index:1;
  background:linear-gradient(180deg,rgba(6,26,43,0) 38%,rgba(6,26,43,.86) 100%);
}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  margin:0;padding:14px 16px;
  font-size:12px;line-height:1.5;letter-spacing:.07em;color:var(--mist-cyan);
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--21x9{aspect-ratio:21/9}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  background:var(--abyss-navy);
  color:var(--scoreboard-ivory);
  border-top:1px solid var(--slate-line);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:3px;
  background:linear-gradient(90deg,var(--coral-orange),var(--neon-cyan) 46%,var(--midnight-indigo));
}
.footer-top{padding-block:clamp(26px,4vw,42px) clamp(18px,3vw,28px)}
.footer-top__inner{display:block}
.footer-brand__line{font-size:clamp(18px,2.1vw,26px);font-weight:900;line-height:1.28;letter-spacing:-.01em}
.footer-brand__latin{
  margin-top:10px;font-family:var(--font-mono);
  font-size:10.5px;font-weight:600;letter-spacing:.32em;color:var(--neon-cyan);
}

.footer-grid{
  display:grid;gap:clamp(22px,3vw,40px);
  grid-template-columns:1.5fr .85fr .85fr;
  padding-block:clamp(20px,3vw,30px) clamp(26px,4vw,42px);
  border-top:1px solid rgba(42,70,80,.8);
}
.footer-panel{min-width:0}
.footer-panel__label{
  margin-bottom:14px;
  font-size:11px;font-weight:700;letter-spacing:.18em;
  color:var(--warning-amber);
}
.footer-contact{display:grid;gap:11px}
.contact-line{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;
  font-size:14px;line-height:1.6;
}
.contact-line__key{
  flex:0 0 auto;font-family:var(--font-mono);
  font-size:10.5px;font-weight:600;letter-spacing:.1em;color:var(--neon-cyan);
}
.contact-line__value{color:var(--scoreboard-ivory);word-break:break-word}
.copy-btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:30px;padding:0 12px;border-radius:var(--radius-pill);
  border:1px solid var(--slate-line);background:rgba(11,59,74,.7);
  font-size:11px;font-weight:700;letter-spacing:.1em;color:var(--mist-cyan);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.copy-btn:hover{border-color:var(--neon-cyan);color:var(--scoreboard-ivory)}
.copy-btn[data-copied]{background:var(--neon-cyan);border-color:var(--neon-cyan);color:var(--abyss-navy)}
.footer-note{
  margin-top:16px;max-width:46ch;
  font-size:12.5px;line-height:1.75;color:rgba(201,244,242,.72);
}
.copy-feedback{
  min-height:22px;margin-top:8px;
  font-size:12px;letter-spacing:.04em;color:var(--warning-amber);
}

.footer-legal{display:grid;gap:9px}
.footer-legal__link{
  display:inline-block;padding:3px 0;
  font-size:13.5px;color:var(--mist-cyan);
  transition:color .16s var(--ease),transform .16s var(--ease);
}
.footer-legal__link:hover{color:var(--neon-cyan);transform:translateX(2px)}

.footer-base{border-top:1px solid rgba(42,70,80,.8);padding-block:16px}
.footer-base__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  font-size:12px;letter-spacing:.04em;color:rgba(201,244,242,.7);
}
.footer-icp{font-family:var(--font-mono);letter-spacing:.07em}
.footer-copy{font-family:var(--font-mono);letter-spacing:.05em}

/* ---------- responsive ---------- */
@media (min-width:900px){
  .header-status{display:inline-flex}
  .nav-toggle{display:none}
}
@media (max-width:1099px){
  .nav-index__link{padding:8px 9px;font-size:12.5px;gap:6px}
  .header-action{padding:0 12px;font-size:12px}
}
@media (max-width:899px){
  html{scroll-padding-top:96px}
  .navstrip{display:none}
  .navstrip[data-open]{display:block}
  .navstrip__inner{
    flex-direction:column;align-items:stretch;
    gap:16px;padding-block:14px 20px;
  }
  .nav-index{flex-direction:column;align-items:stretch;gap:3px}
  .nav-index__link{
    width:100%;min-height:46px;padding:11px 12px;
    align-items:center;font-size:15px;gap:10px;
  }
  .nav-index__num{font-size:11px}
  .header-actions{
    flex-wrap:wrap;justify-content:flex-start;gap:10px;
    padding-top:16px;border-top:1px solid rgba(42,70,80,.85);
  }
  .header-action{min-height:44px;padding:0 20px;font-size:13px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-panel:first-child{grid-column:1 / -1}
}
@media (max-width:600px){
  .cmdbar__inner{min-height:58px;padding-block:8px}
  .brand__mark{font-size:15.5px}
  .brand__latin{font-size:9px;letter-spacing:.24em}
  .grid--2,.grid--3,.grid--auto{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-panel:first-child{grid-column:auto}
  .footer-base__inner{justify-content:flex-start}
  .media__caption{font-size:11.5px;padding:12px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .panel:hover,.btn:hover,.header-action:hover,.footer-legal__link:hover,.nav-index__link:hover{transform:none}
}