/* ========== 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,figure,blockquote,dl,dd,table{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse}
[hidden]{display:none}

/* ========== 2. tokens ========== */
:root{
  --ink-900:#050B14;
  --ink-800:#0B1725;
  --ink-700:#122535;
  --line:#1F3B4E;
  --paper:#EAF4F8;
  --muted:#93A9B8;
  --white:#FFFFFF;
  --cyan:#00E6C3;
  --orange:#FF6A1F;
  --amber:#FFC53D;
  --ice:#4FA8FF;
  --shell:1280px;
  --gutter:48px;
  --gap:24px;
  --font-sans:'Noto Sans SC','HarmonyOS Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Consolas,monospace;
  --read:0%;
}

/* ========== 3. base ========== */
body{
  background-color:var(--ink-900);
  background-image:linear-gradient(to right,rgba(31,59,78,.26) 1px,transparent 1px);
  background-size:96px 100%;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-weight:800;line-height:1.18;letter-spacing:-.02em;color:var(--paper)}
h2{font-size:clamp(24px,2.6vw,34px)}
h3{font-size:clamp(19px,1.8vw,22px)}
h4{font-size:18px}
#main-content{display:block;scroll-margin-top:96px}
::selection{background:var(--cyan);color:var(--ink-900)}
a:focus-visible,button:focus-visible,[tabindex]:focus-visible,.nav-link:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

/* ========== 4. layout ========== */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(48px,7vw,88px)}
.section--tight{padding-block:clamp(28px,4vw,48px)}
.rule{height:1px;background:var(--line);border:0;margin-block:clamp(24px,3vw,40px)}
.stack{display:flex;flex-direction:column;gap:var(--gap)}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:12px}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}

.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.bento>*{min-width:0}
.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}

/* ========== 5. type utilities ========== */
.display{font-size:clamp(34px,5.4vw,66px);font-weight:900;line-height:1.07;letter-spacing:-.03em}
.section-title{font-size:clamp(24px,2.6vw,34px);font-weight:800;letter-spacing:-.02em}
.card-title{font-size:20px;font-weight:700;line-height:1.25;letter-spacing:-.01em}
.eyebrow{display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--cyan);text-transform:uppercase}
.lead{font-size:17px;line-height:1.65;color:var(--paper);max-width:40rem}
.note{font-size:13px;line-height:1.7;color:var(--muted)}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.num{font-family:var(--font-mono);font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.score{font-family:var(--font-mono);font-weight:700;font-variant-numeric:tabular-nums;color:var(--amber);letter-spacing:.02em}

/* ========== 6. buttons / tags / filter ========== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border:1px solid transparent;border-radius:0;font-size:14px;font-weight:700;letter-spacing:.02em;line-height:1.2;transition:background-color .18s ease,color .18s ease,border-color .18s ease,filter .18s ease}
.btn--primary{background:var(--orange);color:var(--ink-900)}
.btn--primary:hover{filter:brightness(1.1)}
.btn--ghost{border-color:var(--line);color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--sm{padding:8px 14px;font-size:13px}

.tag{display:inline-flex;align-items:center;gap:6px;border-radius:999px;border:1px solid var(--line);background:rgba(5,11,20,.45);padding:2px 10px;font-size:12px;line-height:1.7;letter-spacing:.04em;color:var(--muted)}
.tag--cyan{color:var(--cyan);border-color:rgba(0,230,195,.42)}
.tag--live{color:var(--orange);border-color:rgba(255,106,31,.45)}
.tag--live::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--orange)}

.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{border:1px solid var(--line);background:var(--ink-800);color:var(--muted);padding:6px 14px;font-size:13px;line-height:1.6;transition:color .18s ease,background-color .18s ease,border-color .18s ease}
.filter-btn:hover{color:var(--paper);border-color:var(--cyan)}
.filter-btn[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink-900);font-weight:700}
.empty-state{border:1px dashed var(--line);background:rgba(18,37,53,.6);padding:24px;font-size:14px;line-height:1.7;color:var(--muted);max-width:44rem}
.empty-state strong{color:var(--cyan)}
[data-hidden]{display:none!important}

/* ========== 7. panels / breadcrumb / prose ========== */
.panel{position:relative;background:var(--ink-700);border:1px solid var(--line);padding:clamp(18px,2vw,26px)}
.panel--dark{background:var(--ink-800)}
.panel--flat{background:transparent}
.panel--accent{border-color:rgba(0,230,195,.4)}
.panel--accent::before{content:"";position:absolute;top:-1px;left:-1px;width:56px;height:2px;background:var(--cyan)}

.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px 24px;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:28px}
.section-head__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted)}

.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--muted)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li:not(:last-child)::after{content:"/";color:var(--line)}
.breadcrumb a{color:var(--muted);border-bottom:1px solid transparent}
.breadcrumb a:hover{color:var(--cyan);border-bottom-color:rgba(0,230,195,.5)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

.prose{max-width:40rem}
.prose>*+*{margin-top:1.1em}
.prose h2{font-size:26px;margin-top:1.9em}
.prose h3{font-size:20px;margin-top:1.6em}
.prose p,.prose li{font-size:16px;line-height:1.7}
.prose ul li{position:relative;padding-left:18px}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:7px;height:1px;background:var(--cyan)}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(0,230,195,.45)}
.prose strong{color:var(--cyan);font-weight:700}
.prose blockquote{border-left:2px solid var(--line);padding-left:16px;color:var(--muted);font-size:15px}

.aside-note{border-left:2px solid var(--cyan);padding:4px 0 4px 16px;font-size:13px;line-height:1.75;color:var(--muted)}

/* ========== 8. media / table / timeline / stat ========== */
.media{position:relative;display:block;width:100%;overflow:hidden;border:1px solid var(--line);aspect-ratio:2/1;
  background-image:
    linear-gradient(135deg,rgba(0,230,195,.12),rgba(255,106,31,.07) 58%,rgba(5,11,20,.92)),
    repeating-linear-gradient(90deg,rgba(31,59,78,.55) 0 1px,transparent 1px 34px),
    repeating-linear-gradient(0deg,rgba(31,59,78,.32) 0 1px,transparent 1px 34px);
  background-color:var(--ink-800)}
.media--5x4{aspect-ratio:5/4}
.media--16x9{aspect-ratio:16/9}
.media--1x1{aspect-ratio:1/1}
.media img,.media video{width:100%;height:100%;object-fit:cover;filter:saturate(.94) contrast(1.05)}
.media__cap{position:absolute;left:0;right:0;bottom:0;padding:10px 14px;font-size:13px;line-height:1.6;color:var(--paper);background:linear-gradient(to top,rgba(5,11,20,.94),rgba(5,11,20,0));border-top:1px solid rgba(31,59,78,.6)}
.media__badge{position:absolute;top:10px;left:10px}

.data-table{width:100%;font-size:14px}
.data-table th,.data-table td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle}
.data-table th{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.14em;color:var(--muted);text-transform:uppercase}
.data-table td.num,.data-table th.num{text-align:right}
.data-table tbody tr:hover td{background:rgba(0,230,195,.05)}
.data-table tr[aria-selected="true"] td{background:rgba(79,168,255,.1);border-bottom-color:rgba(79,168,255,.45)}
.val-bar{position:relative;display:block;height:4px;background:rgba(31,59,78,.85);margin-top:6px}
.val-bar i{position:absolute;top:0;bottom:0;left:0;background:var(--cyan)}
.val-bar i.is-alt{background:var(--ice)}

.timeline{position:relative;padding-left:22px;border-left:1px solid var(--line)}
.timeline__item{position:relative;padding-bottom:20px}
.timeline__item::before{content:"";position:absolute;left:-27px;top:7px;width:9px;height:9px;background:var(--ink-900);border:1px solid var(--cyan)}
.timeline__item:last-child{padding-bottom:0}
.timeline__time{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--cyan);margin-bottom:2px}

.stat{display:flex;flex-direction:column;gap:2px}
.stat__num{font-family:var(--font-mono);font-size:clamp(24px,2.4vw,30px);font-weight:700;font-variant-numeric:tabular-nums;color:var(--amber);line-height:1.1}
.stat__key{font-size:12px;letter-spacing:.06em;color:var(--muted)}

/* ========== 9. header ========== */
.skip-link{position:fixed;top:8px;left:8px;z-index:200;background:var(--cyan);color:var(--ink-900);padding:10px 16px;font-size:13px;font-weight:700;transform:translateY(-180%);transition:transform .18s ease}
.skip-link:focus{transform:translateY(0)}

.site-header{position:sticky;top:0;z-index:60;--header-h:76px;background:rgba(5,11,20,.86);border-bottom:1px solid var(--line);transition:background-color .2s ease}
.site-header[data-scrolled]{--header-h:56px;background:rgba(5,11,20,.97)}
.header-shell{display:flex;align-items:center;gap:20px;height:var(--header-h);transition:height .2s ease}

.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{display:grid;grid-template-rows:repeat(3,1fr);gap:2px;width:26px;height:26px;padding:4px;border:1px solid var(--line);background:var(--ink-800)}
.brand-mark i{display:block;background:var(--cyan)}
.brand-mark i:nth-child(2){background:var(--paper);opacity:.55}
.brand-mark i:nth-child(3){background:var(--orange)}
.brand-text{font-size:19px;font-weight:800;letter-spacing:.02em;line-height:1.1;color:var(--paper);white-space:nowrap}
.brand-ver{border-radius:999px;border:1px solid rgba(0,230,195,.38);color:var(--cyan);font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;padding:2px 8px;line-height:1.6;white-space:nowrap}
.brand--footer .brand-text{font-size:18px}

.site-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:flex}
.nav-link{display:inline-flex;align-items:center;height:34px;padding:0 11px;border:1px solid transparent;color:var(--muted);font-size:14px;font-weight:500;line-height:1;white-space:nowrap;transition:color .18s ease,border-color .18s ease,background-color .18s ease}
.nav-link:hover{color:var(--paper);border-color:var(--line)}
.nav-link[aria-current="page"]{color:var(--cyan);border-color:rgba(0,230,195,.42);background:rgba(0,230,195,.08);font-weight:700}

.header-utility{display:flex;align-items:center;gap:10px;flex:0 0 auto;padding-left:12px;border-left:1px solid var(--line)}
.utility-link{font-size:13px;letter-spacing:.02em;color:var(--muted);white-space:nowrap;border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.utility-link:hover{color:var(--cyan);border-bottom-color:rgba(0,230,195,.5)}

.nav-toggle{display:none;flex-direction:column;align-items:center;justify-content:center;gap:4px;width:40px;height:36px;border:1px solid var(--line);background:var(--ink-800)}
.nav-toggle i{display:block;width:16px;height:1px;background:var(--paper);transition:transform .2s ease,opacity .2s ease}
.nav-toggle:hover{border-color:var(--cyan)}
.site-header[data-open] .nav-toggle{border-color:var(--cyan)}
.site-header[data-open] .nav-toggle i:nth-of-type(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle i:nth-of-type(2){opacity:0}
.site-header[data-open] .nav-toggle i:nth-of-type(3){transform:translateY(-5px) rotate(-45deg)}

.read-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none}
.read-progress__fill{display:block;height:100%;width:var(--read,0%);background:var(--orange);transition:width .1s linear}

.dock{display:none}
.dock-link{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;height:56px;font-size:11px;letter-spacing:.02em;color:var(--muted);white-space:nowrap}
.dock-link:active,.dock-link:focus-visible{color:var(--cyan)}
.dock-ico{display:block;width:14px;height:2px;background:currentColor;box-shadow:0 5px 0 currentColor}

/* ========== 10. footer ========== */
.site-footer{position:relative;margin-top:clamp(40px,6vw,80px);background:var(--ink-800);border-top:1px solid var(--line)}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,var(--cyan) 0%,rgba(0,230,195,0) 36%,rgba(255,106,31,0) 64%,var(--orange) 100%)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.5fr;gap:44px 40px;padding-block:clamp(40px,5vw,64px)}
.footer-title{font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.16em;color:var(--cyan);margin-bottom:16px}
.footer-tagline{margin-top:16px;font-size:15px;line-height:1.7;color:var(--paper);max-width:32ch}
.footer-note{margin-top:12px;font-size:12px;line-height:1.7;color:var(--muted);max-width:38ch}
.footer-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 18px;font-size:14px}
.footer-list a{color:var(--muted);border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.footer-list a:hover{color:var(--paper);border-bottom-color:rgba(0,230,195,.5)}
.contact-row{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 10px;padding:10px 0;border-bottom:1px solid var(--line)}
.contact-key{flex:0 0 64px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted)}
.contact-val{font-family:var(--font-mono);font-size:13px;color:var(--paper);word-break:break-all}
.contact-row:nth-of-type(3) .contact-val{font-family:var(--font-sans)}
.copy-btn{margin-left:auto;border:1px solid rgba(0,230,195,.35);color:var(--cyan);font-size:11px;letter-spacing:.06em;padding:2px 8px;line-height:1.7;transition:background-color .18s ease,color .18s ease,border-color .18s ease}
.copy-btn:hover{background:rgba(0,230,195,.14)}
.copy-btn[data-copied]{color:var(--orange);border-color:rgba(255,106,31,.55)}
.copy-status{margin-top:10px;min-height:1em;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--cyan)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;padding-block:20px;border-top:1px solid var(--line)}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:16px;font-size:12px;color:var(--muted)}
.footer-legal a{color:var(--muted);border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.footer-legal a:hover{color:var(--cyan);border-bottom-color:rgba(0,230,195,.5)}
.footer-legal--end{font-family:var(--font-mono);letter-spacing:.02em}
.footer-sep{color:var(--line)}

/* ========== 11. reveal ========== */
.js-ready [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .24s ease,transform .24s ease}
.js-ready [data-reveal][data-shown]{opacity:1;transform:none}

/* ========== 12. responsive ========== */
@media (max-width:1024px){
  :root{--gutter:32px}
  .site-nav{position:fixed;left:0;right:0;top:var(--header-h);max-height:calc(100vh - var(--header-h));overflow:auto;background:var(--ink-800);border-bottom:1px solid var(--line);padding:10px var(--gutter) 24px;opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .2s ease,transform .2s ease,visibility .2s}
  .site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{height:46px;padding:0 10px;font-size:15px;border-bottom:1px solid var(--line);justify-content:space-between}
  .nav-link[aria-current="page"]{background:rgba(0,230,195,.08)}
  .header-utility{margin-left:auto;border-left:0;padding-left:0}
  .nav-toggle{display:flex}
  .span-3,.span-4{grid-column:span 6}
  .span-5,.span-7,.span-8,.span-9{grid-column:span 12}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:1/-1}
}
@media (max-width:767px){
  :root{--gutter:20px;--gap:16px}
  body{padding-bottom:64px;background-size:64px 100%}
  .header-shell{gap:12px}
  .brand-ver{display:none}
  .utility-link{display:none}
  .brand-text{font-size:17px}
  .dock{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));position:fixed;left:0;right:0;bottom:0;z-index:80;background:rgba(11,23,37,.98);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-12{grid-column:1/-1}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-list{grid-template-columns:1fr 1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .footer-tagline,.footer-note{max-width:none}
  .contact-key{flex-basis:100%}
  .copy-btn{margin-left:0}
  .data-table{font-size:13px}
  .data-table th,.data-table td{padding:8px 8px}
}
@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}
  .read-progress__fill{transition:none}
}