/* ===== 1. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd,table,th,td{margin:0;padding:0}
ul,ol{list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
img,svg,video{display:block;max-width:100%;height:auto}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid #C4F94A;outline-offset:3px}

/* ===== 2. Tokens ===== */
:root{
  --ink-night:#0A1226;
  --ink-room:#121C3D;
  --grid-line:#26325C;
  --silver:#AEB7CC;
  --paper:#EEF2FA;
  --lime:#C4F94A;
  --orange:#FF6A2B;
  --cyan:#2FE3D0;
  --violet:#8A6BFF;
  --red:#E23A4E;
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --gutter:24px;
  --radius-pill:999px;
  --shadow-panel:0 24px 60px rgba(3,7,18,.55);
}

/* ===== 3. Base ===== */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--paper);
  background:var(--ink-night);
  min-height:100vh;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(38,50,92,.34) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(38,50,92,.34) 1px,transparent 1px);
  background-size:96px 96px;
  opacity:.5;
}
main{position:relative;z-index:1}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;line-height:1.12}

/* ===== 4. Layout ===== */
.container{width:min(1440px,100% - 48px);margin-inline:auto}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gutter)}
.col-rail{grid-column:span 3}
.col-main{grid-column:span 9}
.section{position:relative;padding-block:96px}
.section--tight{padding-block:64px}
.section-head{display:flex;flex-direction:column;gap:12px;max-width:900px}
.rule{height:1px;background:var(--grid-line);border:0;width:100%}

/* ===== 5. Text ===== */
.display-xl{font-size:clamp(56px,11vw,164px);line-height:.92;font-weight:900;letter-spacing:-.03em}
.section-title{font-size:clamp(30px,4vw,56px);font-weight:800;letter-spacing:-.02em;line-height:1.05}
.subtitle{font-size:22px;font-weight:600;letter-spacing:-.01em}
.lead{font-size:19px;line-height:1.7;color:var(--silver);max-width:62ch}
.eyebrow{font-size:12px;letter-spacing:.22em;color:var(--silver);text-transform:uppercase}
.chapter-num{font-family:var(--font-mono);font-size:13px;letter-spacing:.18em;color:var(--silver)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.08em}
.muted{color:var(--silver);font-size:13px}
.prose{max-width:68ch;font-size:17px;line-height:1.75}
.prose p + p{margin-top:1em}
.prose h3{margin-top:2em;font-size:22px;font-weight:600}

/* ===== 6. Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:14px 26px;border:1px solid var(--grid-line);
  font-size:15px;font-weight:600;letter-spacing:.02em;
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn--primary{background:var(--lime);color:var(--ink-night);border-color:var(--lime)}
.btn--primary:hover{background:#d5ff77;border-color:#d5ff77}
.btn--ghost{background:transparent;color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--accent{background:transparent;color:var(--orange);border-color:var(--orange)}
.btn--accent:hover{background:var(--orange);color:var(--ink-night)}
.btn--block{width:100%}

/* ===== 7. Skip link ===== */
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:200;
  padding:10px 20px;border-radius:var(--radius-pill);
  background:var(--lime);color:var(--ink-night);
  font-size:14px;font-weight:700;
  transition:top .2s ease;
}
.skip-link:focus{top:16px}

/* ===== 8. Header ===== */
.site-header{
  position:sticky;top:0;z-index:90;
  padding-block:14px;
  background:linear-gradient(180deg,rgba(10,18,38,.97),rgba(10,18,38,.78));
  border-bottom:1px solid var(--grid-line);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  transition:padding .24s ease,background .24s ease;
}
.site-header[data-compact="true"]{padding-block:8px;background:rgba(8,14,30,.94)}
.header-shell{display:flex;align-items:center;gap:12px;flex-wrap:nowrap}
.brand{
  display:flex;align-items:center;gap:10px;flex:0 0 auto;
  padding:8px 16px 8px 12px;
  border:1px solid var(--grid-line);border-radius:var(--radius-pill);
  background:var(--ink-room);
  transition:border-color .2s ease;
}
.brand:hover{border-color:var(--cyan)}
.brand-mark{width:10px;height:10px;background:var(--lime);box-shadow:0 0 0 4px rgba(196,249,74,.16)}
.brand-text{display:flex;flex-direction:column;line-height:1.16}
.brand-name{font-size:15px;font-weight:700;letter-spacing:.02em}
.brand-sub{font-size:11px;color:var(--silver);letter-spacing:.02em"}
.site-header[data-compact="true"] .brand-sub{display:none}
.site-nav{
  margin-left:auto;
  padding:4px;
  border:1px solid var(--grid-line);border-radius:var(--radius-pill);
  background:rgba(18,28,61,.92);
}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:block;padding:8px 14px;border-radius:var(--radius-pill);
  font-size:14px;color:var(--silver);white-space:nowrap;
  transition:color .18s ease,background .18s ease;
}
.nav-link:hover{color:var(--paper);background:rgba(47,227,208,.10)}
.nav-link[aria-current="page"]{background:var(--lime);color:var(--ink-night);font-weight:600}
.header-meta{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.round-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border:1px solid var(--grid-line);border-radius:var(--radius-pill);
  background:var(--ink-room);font-size:12px;color:var(--silver);white-space:nowrap;
}
.round-badge-label{letter-spacing:.08em}
.round-badge-num{
  font-family:var(--font-mono);font-size:14px;font-weight:600;
  color:var(--cyan);font-variant-numeric:tabular-nums;
}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 14px;border:1px solid var(--grid-line);border-radius:var(--radius-pill);
  background:var(--ink-room);font-size:13px;color:var(--silver);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;background:var(--lime);
  transition:transform .22s ease;
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(4.2px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-4.2px) rotate(-45deg)}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(38,50,92,.75);overflow:hidden;
}
.scroll-progress-bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--lime));
}

/* ===== 9. Footer ===== */
.site-footer{
  position:relative;z-index:1;margin-top:96px;
  border-top:1px solid var(--grid-line);
  background:linear-gradient(180deg,rgba(18,28,61,.6),rgba(7,13,28,1) 58%);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;height:3px;width:min(340px,42%);
  background:linear-gradient(90deg,var(--lime),var(--cyan));
}
.footer-shell{
  display:grid;grid-template-columns:repeat(12,minmax(0,1fr));
  gap:36px var(--gutter);padding-block:72px 40px;
}
.footer-brand{grid-column:span 4}
.footer-col{grid-column:span 2}
.footer-contact{grid-column:span 4}
.footer-brand-name{font-size:17px;font-weight:700;letter-spacing:.01em}
.footer-brand-note{margin-top:10px;font-size:13px;color:var(--silver)}
.footer-col-title{
  margin-bottom:16px;font-size:12px;font-weight:600;
  letter-spacing:.2em;color:var(--silver);text-transform:uppercase;
}
.footer-links{display:grid;gap:10px}
.footer-link{font-size:14px;color:var(--silver);transition:color .18s ease}
.footer-link:hover{color:var(--lime)}
.footer-contact-list{display:grid;gap:12px}
.footer-contact-item{display:grid;grid-template-columns:52px minmax(0,1fr);gap:10px;align-items:baseline}
.footer-contact-label{font-size:12px;letter-spacing:.1em;color:var(--grid-line);color:var(--silver)}
.footer-contact-value{font-size:14px;color:var(--paper);word-break:break-word}
.footer-contact-note{margin-top:14px;font-size:12px;line-height:1.7;color:var(--silver)}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:16px 40px;justify-content:space-between;align-items:flex-start;
  padding-block:24px 40px;border-top:1px solid var(--grid-line);
}
.footer-update{font-size:13px;line-height:1.8;color:var(--silver);max-width:58ch}
.footer-legal{display:flex;flex-wrap:wrap;gap:12px 22px;align-items:center;font-size:13px;color:var(--silver)}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:18px}
.footer-icp{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em}
.footer-copy{font-size:12px;color:var(--silver)}

/* ===== 10. Content components ===== */
.band{
  border-top:1px solid var(--lime);
  border-bottom:1px solid var(--grid-line);
  background:var(--ink-room);
}
.band-inner{
  display:flex;align-items:stretch;gap:12px;
  min-height:88px;padding-block:16px;
  overflow-x:auto;scroll-snap-type:x proximity;
  scrollbar-width:thin;
}
.band-inner::-webkit-scrollbar{height:6px}
.band-inner::-webkit-scrollbar-track{background:rgba(38,50,92,.4)}
.band-inner::-webkit-scrollbar-thumb{background:var(--grid-line)}
.band-item{
  flex:0 0 auto;scroll-snap-align:center;
  display:flex;flex-direction:column;justify-content:center;gap:4px;
  min-width:132px;padding:12px 18px;
  border:1px solid var(--grid-line);
  transition:border-color .2s ease,background .2s ease;
}
.band-item[data-active="true"]{border-color:var(--lime);background:rgba(196,249,74,.08)}
.band-item-round{font-family:var(--font-mono);font-size:16px;color:var(--paper)}
.band-item-meta{font-size:12px;color:var(--silver)}
.chip-group{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 15px;border:1px solid var(--grid-line);border-radius:var(--radius-pill);
  font-size:13px;color:var(--silver);background:transparent;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.chip:hover{border-color:var(--cyan);color:var(--cyan)}
.chip[data-active="true"]{background:var(--lime);border-color:var(--lime);color:var(--ink-night);font-weight:600}
.panel{border:1px solid var(--grid-line);background:var(--ink-room);padding:24px}
.stat{display:flex;flex-direction:column;gap:6px}
.stat-value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(28px,4vw,52px);font-weight:700;line-height:1;color:var(--paper);
}
.stat-label{font-size:12px;letter-spacing:.1em;color:var(--silver)}
.stat--accent .stat-value{color:var(--lime)}
.stat--alert .stat-value{color:var(--orange)}
.data-table{font-family:var(--font-mono);font-size:14px;font-variant-numeric:tabular-nums}
.data-table th{
  padding:12px 14px;text-align:left;font-size:12px;font-weight:600;
  letter-spacing:.1em;color:var(--silver);border-bottom:1px solid var(--grid-line);
}
.data-table td{padding:14px;border-bottom:1px solid rgba(38,50,92,.7);color:var(--paper)}
.data-table tbody tr{transition:background .18s ease}
.data-table tbody tr:hover{background:rgba(47,227,208,.06)}
.data-table tbody tr[data-selected="true"]{background:rgba(196,249,74,.10)}
.data-table td.is-num{color:var(--cyan)}
.timeline{position:relative;display:grid;padding-left:28px}
.timeline::before{
  content:"";position:absolute;left:7px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(180deg,var(--cyan),var(--violet),transparent);
}
.timeline-item{position:relative;padding-bottom:28px}
.timeline-item::before{
  content:"";position:absolute;left:-28px;top:8px;
  width:9px;height:9px;transform:rotate(45deg);
  background:var(--ink-night);border:1px solid var(--cyan);
}
.timeline-item[data-state="penalty"]::before{background:var(--orange);border-color:var(--orange)}
.timeline-item[data-state="red"]::before{background:var(--red);border-color:var(--red)}
.timeline-time{font-family:var(--font-mono);font-size:13px;color:var(--silver);letter-spacing:.08em}
.media-frame{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  border:1px solid var(--grid-line);
  background:linear-gradient(140deg,var(--ink-room),#0a1226 72%);
}
.media-frame img,.media-frame svg{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(238,242,250,.045) 0 1px,transparent 1px 4px);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame--graphic{
  display:grid;place-items:center;
  background-image:
    linear-gradient(to right,rgba(38,50,92,.45) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(38,50,92,.45) 1px,transparent 1px);
  background-size:32px 32px;
}
.media-frame-note{
  position:relative;z-index:1;padding:8px 14px;
  font-family:var(--font-mono);font-size:12px;color:var(--silver);
  border:1px solid var(--grid-line);background:rgba(10,18,38,.7);
}
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:13px;color:var(--silver)}
.breadcrumb-item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--grid-line)}
.breadcrumb-link{color:var(--silver)}
.breadcrumb-link:hover{color:var(--cyan)}
.breadcrumb-current{color:var(--paper)}

/* ===== 11. Page-level utilities ===== */
.chapter-rail{position:sticky;top:112px;display:grid;gap:2px;align-content:start}
.chapter-rail-link{
  display:flex;gap:10px;align-items:baseline;
  padding:9px 0 9px 14px;border-left:1px solid var(--grid-line);
  font-size:13px;color:var(--silver);transition:color .18s ease,border-color .18s ease;
}
.chapter-rail-link:hover{color:var(--paper);border-left-color:var(--cyan)}
.chapter-rail-link[aria-current="true"]{color:var(--lime);border-left-color:var(--lime)}
.back-to-top{
  position:fixed;right:20px;bottom:20px;z-index:80;
  display:none;place-items:center;width:48px;height:48px;
  border:1px solid var(--grid-line);border-radius:var(--radius-pill);
  background:var(--ink-room);color:var(--lime);font-size:15px;
  box-shadow:var(--shadow-panel);
}
.back-to-top[data-visible="true"]{display:grid}
.back-to-top:hover{border-color:var(--lime)}

/* ===== 12. Motion ===== */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .48s ease,transform .48s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* ===== 13. Responsive ===== */
@media (max-width:1180px){
  .nav-link{padding:8px 11px;font-size:13px}
  .brand-sub{display:none}
}
@media (max-width:1023px){
  .container{width:min(1440px,100% - 32px)}
  .site-nav{
    position:absolute;left:16px;right:16px;top:calc(100% + 10px);
    margin:0;padding:10px;border-radius:20px;
    background:rgba(12,20,44,.98);
    box-shadow:var(--shadow-panel);
    max-height:calc(100vh - 140px);overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-link{padding:12px 16px;border-radius:12px;font-size:16px}
  .nav-link[aria-current="page"]{border-radius:12px}
  .nav-toggle{display:inline-flex}
  .header-shell{position:relative}
  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
  .col-rail,.col-main{grid-column:span 4}
  .chapter-rail{position:static;display:flex;flex-wrap:wrap;gap:8px}
  .chapter-rail-link{border-left:0;border-bottom:1px solid var(--grid-line);padding:8px 12px}
  .footer-brand{grid-column:span 6}
  .footer-col{grid-column:span 3}
  .footer-contact{grid-column:span 6}
  .section{padding-block:72px}
}
@media (max-width:640px){
  body{font-size:16px}
  .round-badge-label{display:none}
  .footer-brand,.footer-col,.footer-contact{grid-column:span 12}
  .footer-shell{padding-block:56px 32px;gap:32px}
  .section{padding-block:56px}
  .chapter-num{font-size:12px}
  .band-inner{min-height:76px}
}
@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}
}