/* ===== reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
table{border-collapse:collapse;width:100%}
[id]{scroll-margin-top:104px}

/* ===== tokens ===== */
:root{
  --ink-900:#0B1026;
  --ink-800:#131A3A;
  --ink-700:#1B2246;
  --line:#2A2F45;
  --paper:#E8ECF8;
  --muted:#8892B0;
  --violet:#7A5CFF;
  --cyan:#21E6D6;
  --pink:#FF4FB8;
  --gold:#FFC25C;
  --orange:#FF7A45;
  --radius-xl:32px;
  --radius-lg:26px;
  --radius-md:20px;
  --radius-pill:999px;
  --container:1240px;
  --gutter:clamp(18px,4vw,44px);
  --shadow-card:0 18px 44px rgba(4,7,22,.55);
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-display:"Arial Narrow","HelveticaNeue-Condensed","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

/* ===== base ===== */
body{
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 620px at 10% -10%, rgba(122,92,255,.20), transparent 62%),
    radial-gradient(900px 520px at 98% 2%, rgba(33,230,214,.13), transparent 60%),
    radial-gradient(820px 660px at 76% 96%, rgba(255,79,184,.09), transparent 66%);
  background-attachment:fixed;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
::selection{background:rgba(33,230,214,.28);color:var(--paper)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}

.container{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.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;top:-64px;left:var(--gutter);z-index:200;
  padding:10px 18px;border-radius:var(--radius-pill);
  background:var(--cyan);color:var(--ink-900);font-size:14px;font-weight:600;
  transition:top .2s ease;
}
.skip-link:focus{top:12px}

/* ===== typography helpers ===== */
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12.5px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--cyan);
}
.num{font-family:var(--font-mono);font-weight:500;letter-spacing:.02em}

/* ===== capsules & chips ===== */
.capsule{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:var(--radius-pill);
  border:1px solid var(--line);background:rgba(42,47,69,.45);
  font-size:13px;letter-spacing:.04em;color:var(--muted);
}
.capsule--violet{color:#C8BDFF;border-color:rgba(122,92,255,.55);background:rgba(122,92,255,.14)}
.capsule--cyan{color:#9BF6EE;border-color:rgba(33,230,214,.5);background:rgba(33,230,214,.12)}
.capsule--gold{color:#FFDDA3;border-color:rgba(255,194,92,.5);background:rgba(255,194,92,.12)}
.capsule--pink{color:#FFB6DE;border-color:rgba(255,79,184,.5);background:rgba(255,79,184,.12)}
.chip-row{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  padding:8px 16px;border-radius:var(--radius-pill);
  border:1px solid var(--line);background:rgba(19,26,58,.7);
  color:var(--muted);font-size:14px;
  transition:color .2s ease,border-color .2s ease,background .2s ease;
}
.chip:hover{color:var(--paper);border-color:var(--cyan)}
.chip[aria-pressed="true"]{color:var(--ink-900);background:var(--cyan);border-color:var(--cyan);font-weight:600}

/* ===== buttons ===== */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 26px;border-radius:var(--radius-pill);
  font-size:15px;font-weight:600;letter-spacing:.02em;
  border:1px solid transparent;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease,background .2s ease;
}
.btn--primary{background:linear-gradient(100deg,var(--violet),var(--cyan));color:#080C1E}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(33,230,214,.28)}
.btn--ghost{border-color:var(--line);background:rgba(19,26,58,.7);color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}

.link-arrow{display:inline-flex;align-items:center;gap:8px;color:var(--cyan);font-size:14.5px}
.link-arrow::after{content:"→";transition:transform .2s ease}
.link-arrow:hover::after{transform:translateX(4px)}

/* ===== layout blocks ===== */
.section{padding-block:clamp(46px,7vw,96px)}
.section__head{display:grid;gap:14px;max-width:820px}
.section__index{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.18em;color:var(--muted)}
.section__title{
  font-family:var(--font-display);
  font-size:clamp(30px,4.6vw,56px);
  font-weight:300;letter-spacing:.04em;line-height:1.12;
}
.section__lead{max-width:62ch;color:var(--muted)}
.grid{display:grid;gap:clamp(16px,2.2vw,26px);grid-template-columns:1fr}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--wide{grid-template-columns:1.35fr .95fr}
@media (max-width:900px){
  .grid--2,.grid--3,.grid--wide{grid-template-columns:1fr}
}
.panel-slant{
  border-radius:var(--radius-xl);
  background:linear-gradient(150deg,rgba(19,26,58,.94),rgba(11,16,38,.9));
  border:1px solid var(--line);
}
.slant{clip-path:polygon(0 0,100% 3.2%,100% 100%,0 96.8%)}
.slant--reverse{clip-path:polygon(0 3.2%,100% 0,100% 96.8%,0 100%)}

/* ===== cards ===== */
.card{
  position:relative;display:block;
  padding:clamp(20px,2.4vw,28px);
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(19,26,58,.92),rgba(11,16,38,.92));
  border:1px solid var(--line);
  transition:transform .22s ease,border-color .22s ease,box-shadow .22s ease;
}
.card:hover,.card:focus-visible{transform:translateY(-4px);border-color:var(--cyan);box-shadow:var(--shadow-card)}
.card__head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.card__title{font-size:21px;font-weight:600;line-height:1.35;letter-spacing:.01em;margin-bottom:10px}
.card__text{color:var(--muted);font-size:15.5px}
.card__meta{margin-top:16px;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--muted)}
.card__arrow{color:var(--cyan);transition:transform .22s ease}
.card:hover .card__arrow{transform:translateX(5px)}

/* ===== data visuals ===== */
.stat{display:grid;gap:4px}
.stat__value{font-family:var(--font-mono);font-size:clamp(26px,3.4vw,40px);font-weight:500;line-height:1.1;color:var(--paper)}
.stat__label{font-size:13px;letter-spacing:.1em;color:var(--muted)}
.data-bar{display:grid;gap:8px}
.data-bar__head{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.data-bar__label{font-size:14px;color:var(--paper)}
.data-bar__value{font-family:var(--font-mono);font-size:13px;color:var(--muted)}
.data-bar__track{height:8px;border-radius:var(--radius-pill);background:rgba(42,47,69,.85);overflow:hidden}
.data-bar__fill{
  display:block;height:100%;width:var(--value,60%);
  border-radius:var(--radius-pill);
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  box-shadow:0 0 18px rgba(33,230,214,.32);
  transition:width .3s ease;
}
.data-bar--gold .data-bar__fill{background:linear-gradient(90deg,var(--gold),var(--pink));box-shadow:0 0 18px rgba(255,194,92,.3)}
.data-bar--pink .data-bar__fill{background:linear-gradient(90deg,var(--pink),var(--violet));box-shadow:0 0 18px rgba(255,79,184,.3)}

.data-table{font-size:15.5px}
.data-table caption{text-align:left;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.12em;color:var(--muted);padding-bottom:12px}
.data-table th{
  text-align:left;padding:12px 14px;font-size:13px;font-weight:500;
  letter-spacing:.08em;color:var(--muted);border-bottom:1px solid var(--line);
}
.data-table td{padding:14px;border-bottom:1px solid rgba(42,47,69,.6)}
.data-table tbody tr:nth-child(odd){background:rgba(19,26,58,.5)}
.data-table td.num{color:var(--paper)}

/* ===== index list ===== */
.index-list{display:grid;gap:2px}
.index-list__item{
  display:grid;grid-template-columns:56px 1fr auto;align-items:baseline;gap:14px;
  padding:14px 6px;border-bottom:1px solid rgba(42,47,69,.6);
}
.index-list__num{font-family:var(--font-mono);font-size:12.5px;color:var(--violet)}

/* ===== aside note / toc / breadcrumbs / prose ===== */
.aside-note{
  padding:18px 20px;border-radius:var(--radius-md);
  border:1px solid var(--line);border-left:2px solid var(--violet);
  background:rgba(19,26,58,.55);
  font-size:14.5px;color:var(--muted);
}
.aside-note__title{display:block;margin-bottom:6px;font-size:13px;letter-spacing:.12em;color:var(--paper)}
.toc{padding:20px;border-radius:var(--radius-lg);border:1px solid var(--line);background:rgba(19,26,58,.6)}
.toc__title{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.14em;color:var(--muted);margin-bottom:12px}
.toc__list{display:grid;gap:4px}
.toc__link{
  display:block;padding:9px 14px;border-radius:var(--radius-pill);
  font-size:14.5px;color:var(--muted);border-left:2px solid transparent;
  transition:color .2s ease,background .2s ease;
}
.toc__link:hover{color:var(--paper);background:rgba(42,47,69,.5)}
.toc__link[aria-current="true"]{color:var(--cyan);background:rgba(33,230,214,.1);border-left-color:var(--cyan)}
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--muted)}
.breadcrumbs__link{color:var(--muted)}
.breadcrumbs__link:hover{color:var(--cyan)}
.breadcrumbs__current{color:var(--paper)}
.breadcrumbs li+li::before{content:"/";margin-right:8px;color:var(--line)}
.prose{max-width:62ch;color:var(--paper)}
.prose p+p{margin-top:16px}
.prose h2{margin-top:34px;font-family:var(--font-display);font-weight:300;letter-spacing:.04em;font-size:clamp(24px,3vw,34px)}
.prose h3{margin-top:26px;font-size:19px;font-weight:600}
.prose ul{margin-top:14px;display:grid;gap:10px}
.prose li{padding-left:20px;position:relative;color:var(--muted)}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:8px;border-radius:3px;background:var(--violet)}

/* ===== media frame ===== */
.media-frame{
  position:relative;overflow:hidden;border-radius:var(--radius-xl);
  border:1px solid var(--line);
  aspect-ratio:16/9;
  background:
    linear-gradient(140deg,rgba(122,92,255,.26),rgba(11,16,38,.92) 46%,rgba(33,230,214,.18));
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(42,47,69,.45) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,47,69,.45) 1px,transparent 1px);
  background-size:44px 44px;
  opacity:.5;
}
.media-frame__img{width:100%;height:100%;object-fit:cover;position:relative;z-index:1}
.media-frame__caption{
  position:absolute;left:16px;bottom:14px;z-index:2;
  padding:6px 13px;border-radius:var(--radius-pill);
  background:rgba(11,16,38,.75);
  font-family:var(--font-mono);font-size:12.5px;color:var(--muted);
}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}

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

/* ===== copy toast ===== */
.copy-toast{
  position:fixed;left:50%;bottom:26px;z-index:300;
  transform:translate(-50%,14px);
  padding:11px 20px;border-radius:var(--radius-pill);
  background:rgba(19,26,58,.96);border:1px solid var(--cyan);color:var(--paper);
  font-family:var(--font-mono);font-size:13px;
  opacity:0;pointer-events:none;transition:opacity .24s ease,transform .24s ease;
}
.copy-toast.is-active{opacity:1;transform:translate(-50%,0)}

/* ===== header ===== */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(11,16,38,.86);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  pointer-events:none;z-index:2;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(var(--progress,0));transform-origin:left center;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 55%,var(--pink));
  transition:transform .12s linear;
}
.site-header__inner{
  display:flex;align-items:center;justify-content:space-between;gap:clamp(14px,3vw,40px);
  min-height:78px;padding-block:12px;
}
.brand{display:flex;align-items:center;gap:14px}
.brand__mark{
  display:grid;place-items:center;width:46px;height:46px;flex:none;
  border-radius:15px;
  background:linear-gradient(140deg,var(--violet),var(--cyan));
  color:#080C1E;font-family:var(--font-mono);font-size:16px;font-weight:700;letter-spacing:.04em;
}
.brand__text{display:grid;gap:2px;line-height:1.25}
.brand__name{font-size:18px;font-weight:600;letter-spacing:.02em;color:var(--paper)}
.brand__sub{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--muted)}
.header-quick{display:none}
.site-nav__list{display:flex;align-items:center;gap:4px}
.site-nav__link{
  display:inline-block;padding:9px 15px;border-radius:var(--radius-pill);
  font-size:14.5px;color:var(--muted);
  box-shadow:inset 0 -2px 0 0 transparent;
  transition:color .2s ease,background .2s ease,box-shadow .2s ease;
}
.site-nav__link:hover{color:var(--paper);background:rgba(42,47,69,.55)}
.site-nav__link[aria-current="page"]{
  color:var(--cyan);background:rgba(33,230,214,.12);
  box-shadow:inset 0 -2px 0 0 var(--cyan);
}
.nav-toggle{display:none;align-items:center;gap:9px;padding:10px 16px;border-radius:var(--radius-pill);border:1px solid var(--line);background:rgba(19,26,58,.8)}
.nav-toggle__bars{position:relative;width:18px;height:2px;border-radius:2px;background:var(--paper);display:block}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:18px;height:2px;border-radius:2px;background:var(--paper);transition:transform .2s ease}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle__label{font-size:13.5px;color:var(--muted)}
.site-header[data-open="true"] .nav-toggle__bars{background:transparent}
.site-header[data-open="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

/* ===== footer ===== */
.site-footer{
  margin-top:clamp(40px,6vw,80px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(19,26,58,.35),rgba(11,16,38,.96));
}
.site-footer__inner{padding-block:clamp(40px,5vw,68px) 26px}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1.35fr 1fr;gap:clamp(22px,3vw,40px)}
.footer-col{display:grid;gap:12px;align-content:start}
.footer-brand{
  font-family:var(--font-display);font-size:24px;font-weight:300;
  letter-spacing:.06em;color:var(--paper);
}
.footer-note{font-size:14.5px;color:var(--muted);max-width:36ch}
.footer-note--dim{font-size:13.5px;color:#6B769A}
.footer-col__title{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.16em;color:var(--paper)}
.footer-list{display:grid;gap:9px}
.footer-link{font-size:14.5px;color:var(--muted);transition:color .2s ease}
.footer-link:hover{color:var(--cyan)}
.footer-contact{display:grid;gap:12px}
.footer-contact__row{display:grid;gap:3px}
.footer-contact__label{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;color:#6B769A}
.footer-contact__value{
  font-size:14.5px;color:var(--paper);cursor:pointer;
  border-bottom:1px dashed rgba(136,146,176,.5);
  transition:color .2s ease,border-color .2s ease;
}
.footer-contact__value:hover,.footer-contact__value:focus-visible{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-contact__value--num{font-family:var(--font-mono)}
.footer-meta{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  margin-top:clamp(28px,4vw,46px);padding-top:20px;
  border-top:1px solid var(--line);
  font-size:13px;color:var(--muted);
}
.footer-copy{font-size:13px;color:var(--muted)}
.footer-legal{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:#6B769A}

/* ===== tablet ===== */
@media (max-width:1100px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .site-nav__link{padding:8px 11px;font-size:14px}
}

/* ===== mobile & compact nav ===== */
@media (max-width:960px){
  .site-header__inner{min-height:66px;gap:10px}
  .brand__sub{display:none}
  .header-quick{
    display:inline-flex;margin-left:auto;
    padding:9px 15px;border-radius:var(--radius-pill);
    border:1px solid rgba(33,230,214,.5);background:rgba(33,230,214,.12);
    color:#9BF6EE;font-size:13.5px;
  }
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;left:14px;right:14px;bottom:14px;z-index:90;
    padding:16px;border-radius:var(--radius-lg);
    background:linear-gradient(160deg,rgba(19,26,58,.99),rgba(11,16,38,.99));
    border:1px solid var(--line);
    box-shadow:0 26px 60px rgba(3,6,20,.6);
    transform:translateY(calc(100% + 32px));
    opacity:0;visibility:hidden;
    transition:transform .3s ease,opacity .26s ease,visibility .26s ease;
  }
  .site-header[data-open="true"] .site-nav{transform:none;opacity:1;visibility:visible}
  .site-nav__list{flex-wrap:wrap;gap:8px}
  .site-nav__link{
    padding:10px 16px;border-radius:var(--radius-pill);
    background:rgba(42,47,69,.5);border:1px solid rgba(42,47,69,.9);color:var(--paper);
    box-shadow:none;
  }
  .site-nav__link[aria-current="page"]{color:var(--cyan);border-color:rgba(33,230,214,.55);background:rgba(33,230,214,.12)}
  .footer-grid{grid-template-columns:1fr}
  .footer-note{max-width:none}
}

@media (max-width:520px){
  body{font-size:16px}
  .footer-meta{flex-direction:column;align-items:flex-start}
}

/* ===== reduced 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;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .scroll-progress__bar{transition:none}
}