/* ============ reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button,input{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
[hidden]{display:none !important}
html.is-locked{overflow:hidden}

/* ============ tokens ============ */
:root{
  --ink:#0A0F1E;
  --panel:#121826;
  --panel-alt:#1B2436;
  --line:#2E3A50;
  --accent:#2BE8B0;
  --accent-deep:#0F8F72;
  --cta:#FFA23A;
  --text:#EDF2F6;
  --muted:#93A0B5;
  --decor:#3C5A4A;
  --shell:1440px;
  --radius:2px;
  --shadow-plate:4px 4px 0 rgba(0,0,0,.45);
  --shadow-plate-lg:8px 8px 0 rgba(0,0,0,.5);
  --ease:cubic-bezier(.22,1,.36,1);
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --font-head:"Barlow Condensed","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",Impact,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ============ base ============ */
body{
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  opacity:.5;
  background-image:
    repeating-linear-gradient(to right,rgba(46,58,80,.30) 0 1px,transparent 1px 96px),
    repeating-linear-gradient(to bottom,rgba(46,58,80,.30) 0 1px,transparent 1px 96px);
}
main,header,footer{position:relative;z-index:1}
[id]{scroll-margin-top:88px}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:600;letter-spacing:-.02em;line-height:1.12}
::selection{background:var(--accent);color:#062018}

/* ============ utilities ============ */
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 clamp(16px,3vw,40px)}
.shell--narrow{max-width:900px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{
  position:absolute;left:12px;top:-72px;z-index:200;
  background:var(--cta);color:#141414;font-weight:600;font-size:14px;
  padding:10px 18px;border-radius:var(--radius);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ============ typography helpers ============ */
.num{font-family:var(--font-head);font-variant-numeric:tabular-nums;line-height:.9;letter-spacing:-.02em}
.num--hero{font-size:clamp(72px,14vw,220px);color:var(--accent)}
.num--lg{font-size:clamp(48px,7vw,96px)}
.num--accent{color:var(--accent)}
.annot{
  font-size:11px;letter-spacing:.24em;color:var(--muted);line-height:1.4;
  writing-mode:vertical-rl;text-orientation:mixed;
}
.annot--accent{color:var(--accent)}

/* ============ plate ============ */
.plate{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  box-shadow:var(--shadow-plate);
  padding:clamp(18px,2.6vw,32px);
}
.plate--alt{background:var(--panel-alt)}
.plate--flush{padding:0}

/* ============ tag ============ */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid var(--accent);border-radius:var(--radius);
  background:rgba(43,232,176,.07);color:var(--text);
  font-size:11px;letter-spacing:.14em;line-height:1.6;
}
.tag--muted{border-color:var(--line);background:transparent;color:var(--muted)}
.tag--cta{border-color:var(--cta);background:rgba(255,162,58,.08);color:var(--cta)}

/* ============ button ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;border:1px solid var(--line);border-radius:var(--radius);
  font-size:14px;font-weight:600;letter-spacing:.06em;line-height:1.2;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease);
}
.btn--cta{background:var(--cta);border-color:var(--cta);color:#141414;box-shadow:3px 3px 0 rgba(0,0,0,.5)}
.btn--cta:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 rgba(0,0,0,.5)}
.btn--cta:active{transform:translate(1px,1px);box-shadow:1px 1px 0 rgba(0,0,0,.5)}
.btn--ghost{background:transparent;color:var(--text);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn--line{background:var(--panel-alt);color:var(--text)}

/* ============ crumbs ============ */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;letter-spacing:.1em;color:var(--muted)}
.crumbs a{color:var(--muted);transition:color .18s var(--ease)}
.crumbs a:hover{color:var(--accent)}
.crumbs__sep{color:var(--line)}
.crumbs [aria-current="page"]{color:var(--text)}

/* ============ prose ============ */
.prose{max-width:74ch;font-size:16px;line-height:1.85}
.prose h2{font-size:clamp(22px,2.6vw,30px);margin:2em 0 .6em}
.prose h3{font-size:18px;margin:1.6em 0 .5em;font-family:var(--font-body);font-weight:600;letter-spacing:0}
.prose p{margin:0 0 1.2em}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.4em;list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin:.4em 0}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose strong{font-weight:600}
.prose blockquote{border-left:2px solid var(--accent);padding-left:16px;color:var(--muted);margin:0 0 1.2em}

/* ============ grid ============ */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,1.8vw,24px)}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}
.offset-1{grid-column-start:2}
.offset-2{grid-column-start:3}

/* ============ figure ============ */
.figure{margin:0}
.figure__frame{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  border:1px solid var(--line);background:var(--panel-alt);
  box-shadow:var(--shadow-plate);
}
.figure__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.55;
  background-image:
    repeating-linear-gradient(to right,rgba(46,58,80,.5) 0 1px,transparent 1px 40px),
    repeating-linear-gradient(to bottom,rgba(46,58,80,.5) 0 1px,transparent 1px 40px);
}
.figure__img{width:100%;height:100%;object-fit:cover}
.figure__cap{margin-top:10px;font-size:12px;letter-spacing:.08em;color:var(--muted)}
.figure--square .figure__frame{aspect-ratio:1/1}
.figure--wide .figure__frame{aspect-ratio:21/9}
.figure--tall .figure__frame{aspect-ratio:4/5}
.figure--corner .figure__frame::before{
  content:"";position:absolute;top:8px;left:8px;width:18px;height:18px;z-index:2;
  border-top:2px solid var(--accent);border-left:2px solid var(--accent);
}

/* ============ reveal ============ */
.js-ready [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .26s var(--ease),transform .26s var(--ease)}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ============ header ============ */
.cmd-bar{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg,#0A0F1E 0%,#0C1223 100%);
  border-bottom:1px solid var(--line);
}
.cmd-bar__inner{
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  min-height:64px;
}
.cmd-brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.cmd-brand__mark{
  display:grid;place-items:center;width:38px;height:38px;flex:0 0 auto;
  border:1px solid var(--accent);border-radius:var(--radius);
  color:var(--accent);font-family:var(--font-head);font-size:16px;font-weight:600;letter-spacing:.04em;
  background:linear-gradient(135deg,rgba(43,232,176,.16),rgba(10,15,30,0) 70%);
}
.cmd-brand__text{display:flex;flex-direction:column;line-height:1.2}
.cmd-brand__name{font-size:15px;font-weight:600;letter-spacing:.02em}
.cmd-brand__meta{font-size:11px;letter-spacing:.16em;color:var(--muted)}
.cmd-nav{margin-left:auto;display:flex;align-items:center}
.cmd-nav__list{display:flex;align-items:stretch;gap:2px;counter-reset:nav}
.cmd-nav__item{display:block}
.cmd-nav__link{
  position:relative;display:inline-block;padding:12px 12px 14px;
  font-size:14px;letter-spacing:.08em;color:var(--muted);
  transition:color .18s var(--ease);
}
.cmd-nav__link::before{
  counter-increment:nav;content:counter(nav,decimal-leading-zero);
  font-family:var(--font-mono);font-size:9px;color:var(--line);
  margin-right:6px;vertical-align:2px;
}
.cmd-nav__link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:6px;height:2px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.cmd-nav__link:hover{color:var(--text)}
.cmd-nav__link:hover::after{transform:scaleX(1)}
.cmd-nav__link[aria-current="page"]{color:var(--text)}
.cmd-nav__link[aria-current="page"]::before{color:var(--accent)}
.cmd-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.cmd-nav__foot{display:none}
.cmd-bar__tools{display:flex;align-items:center;gap:12px;margin-left:8px;flex:0 0 auto}
.cmd-bar__tools::before{content:"";width:1px;height:24px;background:var(--line)}
.cmd-hint{display:flex;align-items:center;gap:5px;font-size:11px;letter-spacing:.1em;color:var(--muted);white-space:nowrap}
.cmd-hint__key{
  display:inline-block;padding:2px 6px;line-height:1.2;
  border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel-alt);color:var(--text);font-size:10px;font-family:var(--font-mono);
}
.cmd-toggle{
  display:none;width:42px;height:42px;flex:0 0 auto;
  align-items:center;justify-content:center;flex-direction:column;gap:4px;
  border:1px solid var(--line);border-radius:var(--radius);background:var(--panel-alt);
}
.cmd-toggle__bar{display:block;width:18px;height:2px;background:var(--text);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.cmd-bar[data-open] .cmd-toggle__bar:nth-child(2){transform:translateY(6px) rotate(45deg)}
.cmd-bar[data-open] .cmd-toggle__bar:nth-child(3){opacity:0}
.cmd-bar[data-open] .cmd-toggle__bar:nth-child(4){transform:translateY(-6px) rotate(-45deg)}
.read-progress{height:2px;width:100%;background:var(--line)}
.read-progress__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--accent-deep),var(--accent));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .12s linear;
}

/* ============ footer ============ */
.plate-footer{
  position:relative;margin-top:clamp(56px,8vw,120px);
  background:var(--panel);border-top:1px solid var(--line);
}
.plate-footer__rail{position:relative;height:8px;background:var(--line);overflow:hidden}
.plate-footer__rail::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,var(--accent),var(--accent-deep) 34%,transparent 34%);
  clip-path:polygon(0 100%,34% 0,100% 0,100% 100%);
}
.foot-grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;
  gap:clamp(20px,3vw,40px);
  padding:clamp(32px,5vw,64px) 0 32px;
}
.foot-brand__name{font-family:var(--font-head);font-size:22px;letter-spacing:.02em;color:var(--text)}
.foot-brand__note{margin-top:12px;max-width:44ch;font-size:14px;line-height:1.8;color:var(--muted)}
.foot-brand__meta{margin-top:14px;font-size:11px;letter-spacing:.16em;color:var(--accent)}
.foot-col__title{
  padding-bottom:10px;margin-bottom:14px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-body);font-size:12px;font-weight:600;letter-spacing:.2em;color:var(--muted);
}
.foot-links{display:grid;gap:10px}
.foot-links a{
  display:inline-block;font-size:14px;color:var(--text);opacity:.86;
  transition:color .18s var(--ease),opacity .18s var(--ease);
}
.foot-links a::before{content:"—";margin-right:8px;color:var(--line)}
.foot-links a:hover{color:var(--accent);opacity:1}
.foot-contact{display:grid;gap:10px}
.foot-contact__row{display:grid;grid-template-columns:52px 1fr;gap:8px;align-items:baseline}
.foot-contact__key{font-size:11px;letter-spacing:.14em;color:var(--muted)}
.foot-contact__val{font-size:13px;color:var(--text);word-break:break-all}
.foot-contact__note{margin-top:12px;font-size:12px;line-height:1.7;color:var(--muted)}
.foot-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  padding:18px 0 28px;border-top:1px solid var(--line);
}
.foot-bottom__legal{font-size:12px;letter-spacing:.04em;color:var(--muted)}
.foot-bottom__meta{font-size:12px;letter-spacing:.04em;color:var(--muted)}
.foot-icp{color:var(--text)}
.foot-top{font-size:12px;padding:8px 14px}

/* ============ quick jump ============ */
.quickjump{
  position:fixed;inset:0;z-index:120;
  display:flex;align-items:flex-start;justify-content:center;
  padding:min(12vh,120px) 16px 24px;
}
.quickjump__veil{position:absolute;inset:0;background:rgba(4,7,15,.84)}
.quickjump__panel{
  position:relative;width:min(620px,100%);max-height:70vh;overflow:auto;
  background:var(--panel);border:1px solid var(--line);
  box-shadow:var(--shadow-plate-lg);padding:18px;
}
.quickjump__title{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-size:12px;letter-spacing:.2em;color:var(--muted);margin-bottom:12px;
}
.quickjump__kbd{font-family:var(--font-mono);font-size:10px;color:var(--line)}
.quickjump__input{
  width:100%;padding:12px 14px;
  background:var(--ink);border:1px solid var(--line);border-radius:var(--radius);
  color:var(--text);font-size:15px;letter-spacing:.04em;
}
.quickjump__input::placeholder{color:var(--muted)}
.quickjump__input:focus{outline:none;border-color:var(--accent)}
.quickjump__list{display:grid;gap:6px;margin-top:14px}
.quickjump__row{display:block}
.quickjump__item{
  display:flex;align-items:baseline;justify-content:space-between;gap:14px;
  padding:10px 12px;background:var(--panel-alt);
  border:1px solid transparent;border-radius:var(--radius);
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.quickjump__item:hover,.quickjump__item:focus-visible{border-color:var(--accent);color:var(--accent)}
.quickjump__name{font-size:14px;letter-spacing:.06em}
.quickjump__hint{font-size:11px;letter-spacing:.1em;color:var(--muted);text-align:right}
.quickjump__empty{margin-top:14px;font-size:13px;color:var(--muted)}

/* ============ responsive ============ */
@media (max-width:1180px){
  .cmd-hint{display:none}
}
@media (max-width:1023px){
  .cmd-bar__inner{flex-wrap:wrap}
  .cmd-nav{
    position:absolute;left:0;right:0;top:100%;margin:0;
    display:block;
    background:var(--panel);
    border-bottom:1px solid var(--line);
    box-shadow:0 18px 40px rgba(0,0,0,.55);
    visibility:hidden;opacity:0;transform:translateY(-10px);
    max-height:calc(100vh - 66px);overflow:auto;
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
  }
  .cmd-bar[data-open] .cmd-nav{visibility:visible;opacity:1;transform:none}
  .cmd-nav__list{flex-direction:column;gap:0;padding:8px 0}
  .cmd-nav__item{border-bottom:1px solid rgba(46,58,80,.6)}
  .cmd-nav__link{display:block;padding:14px clamp(16px,4vw,24px);font-size:15px}
  .cmd-nav__link::after{left:clamp(16px,4vw,24px);right:auto;width:18px;bottom:9px}
  .cmd-nav__foot{
    display:block;padding:12px clamp(16px,4vw,24px);
    font-size:11px;letter-spacing:.1em;color:var(--muted);
  }
  .cmd-toggle{display:flex}
  .cmd-bar__tools::before{display:none}
  .cmd-brand__meta{display:none}
  .foot-grid{grid-template-columns:1fr 1fr}
  .foot-brand{grid-column:1 / -1}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9{grid-column:span 12}
  .offset-1,.offset-2{grid-column-start:auto}
}
@media (max-width:599px){
  body{font-size:16px}
  .cmd-bar__inner{min-height:58px;gap:10px}
  .cmd-brand__name{font-size:13px}
  .cmd-brand__mark{width:34px;height:34px;font-size:14px}
  .btn--cta{padding:9px 12px;font-size:13px}
  .foot-grid{grid-template-columns:1fr;padding:28px 0 24px}
  .foot-bottom{flex-direction:column;align-items:flex-start}
  .quickjump{padding:48px 12px 20px}
  .quickjump__item{flex-direction:column;gap:4px}
  .quickjump__hint{text-align:left}
}

/* ============ motion ============ */
@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 [data-reveal]{opacity:1;transform:none}
  .cmd-nav__link::after{transition:none}
}