/* ===== 01 reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,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%}
table{border-collapse:collapse}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ===== 02 tokens ===== */
:root{
  --night:#050A12;
  --night-2:#0A1B2C;
  --steel:#16344A;
  --snow:#F5F9FF;
  --frost:#9DB0C4;
  --cyan:#00F5D4;
  --signal:#FF6B1F;
  --aurora:#B8FF3D;
  --paper:#E8DCC6;
  --ink:#2A1A12;
  --alert:#D7263D;
  --line:rgba(157,176,196,.22);
  --line-strong:rgba(157,176,196,.44);
  --shell-w:1280px;
  --pad:clamp(16px,4vw,48px);
  --cut:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,20px 100%,0 calc(100% - 20px));
  --cut-sm:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
  --font-display:"Arial Black","Helvetica Neue",Helvetica,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

/* ===== 03 base ===== */
body{
  background:var(--night);
  color:var(--snow);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  background-image:
    radial-gradient(900px 420px at 88% -10%,rgba(0,245,212,.10),transparent 70%),
    radial-gradient(720px 380px at 4% 8%,rgba(255,107,31,.09),transparent 72%);
  background-repeat:no-repeat;
  background-attachment:fixed;
}
.shell{width:100%;max-width:var(--shell-w);margin-inline:auto;padding-inline:var(--pad)}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;letter-spacing:-.01em;line-height:1.18}
strong{font-weight:800;color:var(--snow)}

/* ===== 04 skip link ===== */
.skip-link{
  position:absolute;left:12px;top:-80px;z-index:220;
  padding:12px 20px;background:var(--cyan);color:var(--night);
  font:700 13px/1 var(--font-mono);letter-spacing:.1em;
  clip-path:var(--cut-sm);transition:top .18s ease;
}
.skip-link:focus{top:12px}

/* ===== 05 header ===== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:linear-gradient(180deg,rgba(5,10,18,.985),rgba(10,27,44,.965));
  border-bottom:1px solid var(--line-strong);
  backdrop-filter:blur(8px);
}
.header-utility{
  border-bottom:1px solid var(--line);
  background:repeating-linear-gradient(135deg,rgba(22,52,74,.42) 0 12px,rgba(5,10,18,.42) 12px 24px);
}
.header-utility__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 24px;min-height:38px;padding-block:7px;
}
.header-utility__brand{
  font:600 12px/1.5 var(--font-mono);letter-spacing:.14em;color:var(--paper);
}
.utility-list{display:flex;flex-wrap:wrap;align-items:center;gap:6px 20px}
.utility-list__item{
  display:inline-flex;align-items:center;gap:8px;
  font:500 11px/1.5 var(--font-mono);letter-spacing:.1em;color:var(--frost);
}
.status-dot{
  width:7px;height:7px;flex:0 0 auto;background:var(--aurora);
  box-shadow:0 0 0 3px rgba(184,255,61,.14);transform:rotate(45deg);
}
.status-dot--pulse{animation:status-pulse 2.8s ease-in-out infinite}
@keyframes status-pulse{0%,100%{opacity:.35}50%{opacity:1}}

.header-main__inner{
  display:flex;align-items:center;gap:clamp(14px,2.4vw,32px);
  min-height:78px;padding-block:12px;
}
.brand{display:flex;align-items:center;gap:14px;flex:0 0 auto}
.brand__mark{
  display:grid;place-items:center;width:50px;height:50px;
  font:900 28px/1 var(--font-display);color:var(--night);
  background:linear-gradient(150deg,var(--signal),#FFA05C);
  clip-path:polygon(14% 0,100% 0,100% 84%,84% 100%,0 100%,0 14%);
  letter-spacing:-.05em;
}
.brand__text{display:flex;flex-direction:column;gap:3px}
.brand__name{font:900 19px/1.2 var(--font-display);letter-spacing:.03em;color:var(--snow)}
.brand__sub{font:500 10px/1 var(--font-mono);letter-spacing:.24em;color:var(--frost)}

.primary-nav{display:flex;align-items:center;gap:clamp(10px,1.8vw,26px);margin-left:auto}
.primary-nav__list{display:flex;align-items:center;gap:clamp(2px,1vw,10px)}
.nav-link{
  display:inline-flex;align-items:baseline;gap:6px;padding:11px 9px;
  font:600 15px/1.2 var(--font-body);color:var(--snow);
  border-bottom:2px solid transparent;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.nav-link__no{font:500 10px/1 var(--font-mono);letter-spacing:.1em;color:var(--frost);transition:color .2s ease}
.nav-link:hover{color:var(--cyan)}
.nav-link:hover .nav-link__no{color:var(--cyan)}
.nav-link[aria-current="page"]{border-bottom-color:var(--signal);color:var(--snow)}
.nav-link[aria-current="page"] .nav-link__no{color:var(--signal)}
.primary-nav__cta{margin-left:4px;flex:0 0 auto}

.nav-toggle{display:none}

/* ===== 06 footer ===== */
.site-footer{
  position:relative;margin-top:clamp(48px,8vw,96px);
  background:var(--night-2);border-top:1px solid var(--line-strong);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--signal) 58%,var(--aurora));
}
.footer-shell{padding-top:clamp(40px,6vw,68px)}
.footer-grid{
  display:grid;grid-template-columns:1.5fr repeat(3,minmax(0,1fr));
  gap:clamp(24px,3vw,48px);
  padding-bottom:clamp(26px,4vw,42px);
  border-bottom:1px solid var(--line);
}
.footer-brand__title{font:900 clamp(22px,3vw,30px)/1.1 var(--font-display);color:var(--snow)}
.footer-brand__line{
  margin-top:10px;font:600 12px/1.5 var(--font-mono);
  letter-spacing:.2em;color:var(--cyan);
}
.footer-brand__note{margin-top:16px;max-width:36ch;font-size:14px;line-height:1.75;color:var(--frost)}
.footer-col__title{
  padding-bottom:12px;margin-bottom:16px;border-bottom:1px solid var(--line);
  font:600 11px/1 var(--font-mono);letter-spacing:.22em;color:var(--paper);
}
.footer-links{display:flex;flex-direction:column;gap:11px}
.footer-link{
  display:inline-flex;align-items:baseline;gap:9px;
  font-size:14px;color:var(--frost);
  transition:color .18s ease,transform .18s ease;
}
.footer-link__no{font:500 10px/1 var(--font-mono);letter-spacing:.1em;color:rgba(157,176,196,.55)}
.footer-link:hover{color:var(--cyan);transform:translateX(2px)}
.footer-link:hover .footer-link__no{color:var(--cyan)}
.footer-contact{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 26px;
  padding-block:20px;border-bottom:1px solid var(--line);
  font:500 13px/1.7 var(--font-mono);color:var(--frost);
}
.footer-contact__label{
  padding:4px 10px;background:var(--steel);color:var(--snow);
  letter-spacing:.16em;font-size:11px;
}
.footer-contact__value{color:var(--snow)}
.footer-legal{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;
  padding-block:18px;
  font:500 12px/1.7 var(--font-mono);color:rgba(157,176,196,.82);
}
.footer-strip{background:var(--paper);color:var(--ink)}
.footer-strip__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;padding-block:14px;
  font:600 12px/1.5 var(--font-mono);letter-spacing:.08em;
}
.footer-strip__label{padding:4px 10px;background:var(--ink);color:var(--paper);letter-spacing:.2em;font-size:11px}
.footer-strip__no{color:#5A4232}
.footer-strip__tail{color:var(--ink)}

.to-top{
  position:fixed;right:clamp(12px,3vw,28px);bottom:clamp(12px,3vw,28px);z-index:95;
  padding:12px 18px;background:var(--steel);color:var(--snow);
  font:600 12px/1 var(--font-mono);letter-spacing:.12em;
  clip-path:var(--cut-sm);opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s ease,background .22s ease;
}
.to-top:hover{background:var(--cyan);color:var(--night)}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}

/* ===== 07 buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;clip-path:var(--cut-sm);
  font:700 14px/1.15 var(--font-body);letter-spacing:.03em;
  color:var(--night);background:var(--snow);
  transition:transform .18s ease,background .18s ease,color .18s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--signal{background:var(--signal);color:var(--night)}
.btn--signal:hover{background:#FF8A46}
.btn--cyan{background:var(--cyan);color:var(--night)}
.btn--cyan:hover{background:#5CFFF0}
.btn--ghost{
  background:transparent;color:var(--snow);
  box-shadow:inset 0 0 0 1px var(--line-strong);
}
.btn--ghost:hover{box-shadow:inset 0 0 0 1px var(--cyan);color:var(--cyan)}

/* ===== 08 page scaffolding ===== */
.section{position:relative;padding-block:clamp(44px,7vw,92px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:14px 32px;padding-bottom:18px;margin-bottom:clamp(20px,3vw,34px);
  border-bottom:1px solid var(--line);
}
.eyebrow{
  display:inline-block;font:600 11px/1 var(--font-mono);
  letter-spacing:.26em;color:var(--cyan);text-transform:uppercase;
}
.prose{max-width:70ch;font-size:clamp(16px,1.05vw,17px);line-height:1.8;color:rgba(245,249,255,.92)}
.prose p + p{margin-top:1em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(0,245,212,.45)}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.5em}
.mono-label{font:500 11px/1.6 var(--font-mono);letter-spacing:.14em;color:var(--frost)}
.index-no{
  display:block;font:900 clamp(30px,5vw,56px)/.9 var(--font-display);
  letter-spacing:-.05em;color:rgba(0,245,212,.14);
  -webkit-text-stroke:1px rgba(0,245,212,.55);
}

/* ===== 09 breadcrumb ===== */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px;
  padding-block:16px;font:500 12px/1.5 var(--font-mono);color:var(--frost);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:6px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--steel)}
.breadcrumb__item a{color:var(--frost);transition:color .18s ease}
.breadcrumb__item a:hover{color:var(--cyan)}
.breadcrumb__item[aria-current="page"]{color:var(--snow)}

/* ===== 10 panels ===== */
.panel{
  position:relative;padding:clamp(18px,3vw,32px);
  background:var(--night-2);border:1px solid var(--line);
  clip-path:var(--cut);
}
.panel--paper{background:var(--paper);color:var(--ink);border-color:rgba(42,26,18,.25)}
.panel--paper .panel__title{color:var(--ink)}
.panel--paper .mono-label{color:#5A4232}
.panel__head{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:10px 20px;padding-bottom:14px;margin-bottom:18px;
  border-bottom:1px solid var(--line);
}
.panel__title{font:900 clamp(20px,2.3vw,28px)/1.2 var(--font-display);color:var(--snow)}

/* ===== 11 grid ===== */
.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--split{grid-template-columns:minmax(0,7fr) minmax(0,3fr)}

/* ===== 12 chips / tabs / badges ===== */
.chip-row{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 15px;background:rgba(22,52,74,.55);
  border:1px solid var(--line);clip-path:var(--cut-sm);
  font:600 13px/1 var(--font-body);color:var(--frost);
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.chip:hover{color:var(--snow);border-color:var(--line-strong)}
.chip[aria-pressed="true"],.chip.is-active{background:var(--cyan);color:var(--night);border-color:var(--cyan)}
.chip[aria-pressed="false"]{opacity:1}

.tab-list{
  display:flex;flex-wrap:wrap;gap:6px;
  padding-bottom:14px;margin-bottom:22px;border-bottom:1px solid var(--line);
}
.tab{
  padding:10px 16px;background:rgba(22,52,74,.5);
  border:1px solid var(--line);clip-path:var(--cut-sm);
  font:600 13px/1 var(--font-body);color:var(--frost);
  transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.tab:hover{color:var(--snow);border-color:var(--line-strong)}
.tab[aria-selected="true"]{background:var(--signal);color:var(--night);border-color:var(--signal)}
.tab-panel[hidden]{display:none}
.tab-panel.is-active{animation:tab-in .22s ease-out both}
@keyframes tab-in{from{opacity:0;transform:translateX(-10px)}to{opacity:1;transform:none}}

.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid currentColor;
  font:600 11px/1.4 var(--font-mono);letter-spacing:.1em;
}
.badge--cyan{color:var(--cyan)}
.badge--signal{color:var(--signal)}
.badge--aurora{color:var(--aurora)}
.badge--alert{color:var(--alert)}

/* ===== 13 data blocks ===== */
.stat{display:flex;flex-direction:column;gap:8px}
.stat__num{
  font:900 clamp(36px,7vw,64px)/.9 var(--font-display);
  letter-spacing:-.05em;font-variant-numeric:tabular-nums;color:var(--signal);
}
.stat__label{font:500 12px/1.6 var(--font-mono);letter-spacing:.14em;color:var(--frost)}

.data-table{width:100%;font-size:14px;font-variant-numeric:tabular-nums}
.data-table th{
  padding:10px 12px;text-align:left;
  font:600 11px/1.4 var(--font-mono);letter-spacing:.14em;color:var(--frost);
  border-bottom:1px solid var(--line-strong);
}
.data-table td{
  padding:12px;color:var(--snow);border-bottom:1px solid var(--line);
}
.data-table tr:hover td{background:rgba(0,245,212,.06)}
.data-table .num{font-family:var(--font-mono);color:var(--cyan)}

/* ===== 14 accordion ===== */
.accordion{border-top:1px solid var(--line)}
.accordion__item{border-bottom:1px solid var(--line)}
.accordion__btn{
  display:flex;width:100%;align-items:flex-start;justify-content:space-between;
  gap:16px;padding:18px 0;text-align:left;
  font:700 16px/1.5 var(--font-body);color:var(--snow);
  transition:color .18s ease;
}
.accordion__btn::after{content:"+";font:700 18px/1 var(--font-mono);color:var(--cyan)}
.accordion__btn:hover{color:var(--cyan)}
.accordion__btn[aria-expanded="true"]{color:var(--cyan)}
.accordion__btn[aria-expanded="true"]::after{content:"–"}
.accordion__panel{padding-bottom:20px;font-size:15px;line-height:1.8;color:var(--frost)}
.accordion__panel[hidden]{display:none}

/* ===== 15 media frames ===== */
.media-frame{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  background:linear-gradient(140deg,var(--steel),var(--night-2) 60%,var(--night));
  border:1px solid var(--line);clip-path:var(--cut);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame__tag{
  position:absolute;left:0;bottom:0;padding:7px 13px;
  background:var(--paper);color:var(--ink);
  font:600 11px/1.4 var(--font-mono);letter-spacing:.12em;
}

/* ===== 16 motion helpers ===== */
[data-progress]{
  position:fixed;top:0;left:0;z-index:120;height:3px;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--signal) 70%,var(--aurora));
  pointer-events:none;
}
html.js [data-reveal]{opacity:0;transform:translateY(12px)}
html.js [data-reveal].is-in{
  opacity:1;transform:none;
  transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.2,1);
}

/* ===== 17 tablet ===== */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .primary-nav{gap:8px}
  .nav-link{font-size:14px;padding:10px 7px}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:1fr}
}

/* ===== 18 mobile ===== */
@media (max-width:900px){
  .header-utility__inner{justify-content:flex-start}
  .header-utility__brand{letter-spacing:.08em}
  .utility-list{gap:4px 16px}
  .header-main__inner{flex-wrap:wrap;row-gap:10px;padding-block:12px}
  .nav-toggle{
    display:inline-flex;align-items:center;gap:10px;margin-left:auto;
    padding:11px 16px;border:1px solid var(--line-strong);clip-path:var(--cut-sm);
    font:600 12px/1 var(--font-mono);letter-spacing:.14em;color:var(--snow);
    transition:border-color .18s ease,color .18s ease;
  }
  .nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
  .nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:18px}
  .nav-toggle__bars span{display:block;height:2px;background:currentColor;transition:transform .2s ease,opacity .2s ease}
  .nav-toggle[aria-expanded="true"]{border-color:var(--signal);color:var(--signal)}
  .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)}

  .primary-nav{
    display:none;position:absolute;left:0;right:0;top:100%;
    flex-direction:column;align-items:stretch;gap:0;margin:0;
    padding:10px var(--pad) 24px;
    background:var(--night-2);border-bottom:1px solid var(--line-strong);
    box-shadow:0 24px 48px rgba(0,0,0,.55);
    max-height:calc(100vh - 96px);overflow-y:auto;
  }
  .site-header[data-open] .primary-nav{display:flex;animation:nav-drop .22s ease-out both}
  @keyframes nav-drop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .primary-nav__list li + li{border-top:1px solid var(--line)}
  .nav-link{
    width:100%;justify-content:flex-start;padding:15px 4px;
    font-size:16px;border-bottom:0;
  }
  .nav-link[aria-current="page"]{color:var(--signal)}
  .primary-nav__cta{width:100%;margin:18px 0 0}

  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-brand__note{max-width:none}
  .footer-legal{flex-direction:column}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .to-top{padding:11px 15px;font-size:11px}
}

@media (max-width:520px){
  .brand__mark{width:44px;height:44px;font-size:24px}
  .brand__name{font-size:17px}
  .brand__sub{letter-spacing:.16em;font-size:9px}
  .utility-list__item{font-size:10px;letter-spacing:.06em}
  .footer-strip__inner{font-size:11px}
}

/* ===== 19 preferences ===== */
@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 [data-reveal]{opacity:1;transform:none}
}