:root{
    color-scheme:dark;
    --bg:#000;
    --card:#050505;
    --card-2:#080808;
    --card-bg:rgba(5,5,5,.92);
    --card-shadow:none;
    --nav-bg:rgba(0,0,0,.55);
    --form-bg:rgba(10,10,10,.85);
    --pill-bg:#000;
    --ico-bg:rgba(255,255,255,.15);
    --text-2:#d6d6d6;
    --accent-text:#1cc2ff;
    --demo-bg:#05070b;
    --demo-panel:#0b0e14;
    --line:rgba(255,255,255,.1);
    --line-2:rgba(255,255,255,.15);
    --text:#fff;
    --muted:#8f8f8f;
    --accent:#1cc2ff;
    --ease:cubic-bezier(.22,1,.36,1);
    --max:1200px;
  }
  :root[data-theme="light"]{
    color-scheme:light;
    --bg:#f5f6f8;
    --card:#ffffff;
    --card-2:#e9ecf0;
    --card-bg:rgba(255,255,255,.9);
    --card-shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.05);
    --nav-bg:rgba(245,246,248,.72);
    --form-bg:rgba(255,255,255,.92);
    --pill-bg:#fff;
    --ico-bg:rgba(0,0,0,.06);
    --line:rgba(0,0,0,.08);
    --line-2:rgba(0,0,0,.14);
    --text:#0a0a0a;
    --text-2:#2b2b2b;
    --muted:#6b6b6b;
    --accent-text:#0093d0;
    --demo-bg:#e8edf3;
    --demo-panel:#ffffff;
  }
  html.theme-anim,html.theme-anim *{transition:background-color .5s var(--ease),border-color .5s var(--ease),color .5s var(--ease),fill .5s,stroke .5s,filter .5s!important}

  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
  body{background:var(--bg);color:var(--text);font-family:Inter,system-ui,sans-serif;font-size:16px;line-height:1.6;letter-spacing:-.01em;overflow-x:hidden;transition:background-color .5s var(--ease)}
  a{color:inherit;text-decoration:none}
  button{font:inherit;color:inherit}
  .accent{color:var(--accent-text)}
  .container{max-width:var(--max);margin:0 auto;padding:0 40px}
  .progress{position:fixed;top:0;left:0;height:3px;width:0;z-index:60;background:linear-gradient(90deg,#1c8fff,var(--accent));box-shadow:0 0 12px rgba(28,194,255,.6)}
  .nav{position:fixed;top:0;left:0;right:0;z-index:50;background:var(--nav-bg);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
  .nav-inner{height:60px;display:flex;align-items:center;justify-content:space-between;max-width:var(--max);margin:0 auto;padding:0 40px}
  .logo{display:inline-flex;align-items:center}
  .logo img{height:15px;width:auto;display:block;filter:url(#logoAlpha);transition:opacity .25s,filter .5s var(--ease)}
  .logo:hover img{opacity:.75}
  [data-theme="light"] .logo img{filter:url(#logoAlpha) invert(1)}
  .nav-links{display:flex;gap:36px;position:absolute;left:50%;transform:translateX(-50%)}
  .nav-links a{font-size:14px;font-weight:600;padding:4px;transition:opacity .25s}
  .nav-links a:hover{opacity:.6}
  .nav-links a.on{color:var(--accent-text)}
  .nav-actions{display:flex;align-items:center;gap:10px}
  .theme-toggle{width:40px;height:40px;border-radius:50%;background:var(--pill-bg);border:1px solid var(--line-2);display:grid;place-items:center;cursor:pointer;position:relative;overflow:hidden;transition:border-color .3s}
  .theme-toggle:hover{border-color:var(--accent)}
  .theme-toggle svg{position:absolute;transition:transform .6s var(--ease),opacity .4s var(--ease)}
  .theme-toggle .sun{transform:rotate(90deg) scale(.4);opacity:0}
  [data-theme="light"] .theme-toggle .sun{transform:none;opacity:1}
  [data-theme="light"] .theme-toggle .moon{transform:rotate(-90deg) scale(.4);opacity:0}
  .btn-login{display:inline-flex;align-items:center;height:40px;padding:0 18px;border-radius:27px;border:1px solid var(--line-2);font-size:14px;font-weight:600;transition:border-color .3s,color .3s}
  .btn-login:hover{border-color:var(--accent);color:var(--accent)}
  .pill{display:inline-flex;align-items:center;gap:12px;padding:8px 8px 8px 16px;border-radius:27px;background:var(--pill-bg);border:1px solid var(--line-2);font-size:14px;font-weight:600;transition:border-color .3s}
  .pill .ico{width:24px;height:24px;border-radius:12px;background:var(--ico-bg);display:grid;place-items:center;transition:transform .35s var(--ease),background .3s}
  .pill:hover{border-color:rgba(28,194,255,.6)}
  .pill:hover .ico{transform:rotate(-45deg);background:var(--accent)}
  .pill:hover .ico svg{stroke:#000}

  /* header */
  .a-head{position:relative;padding:120px 0 34px;overflow:hidden}
  .a-head::before{content:"";position:absolute;left:50%;top:-360px;width:860px;height:860px;transform:translateX(-50%);border-radius:50%;background:radial-gradient(circle,rgba(28,194,255,.18),transparent 65%);pointer-events:none}
  .crumbs{position:relative;display:flex;gap:8px;align-items:center;font-size:13px;color:var(--muted);margin-bottom:22px}
  .crumbs a:hover{color:var(--accent-text)}
  .chip{display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:999px;font-size:12px;font-weight:700;color:var(--accent-text);background:rgba(28,194,255,.12);border:1px solid rgba(28,194,255,.3)}
  .a-head h1{position:relative;font-size:clamp(32px,4.4vw,54px);font-weight:600;line-height:1.08;letter-spacing:-.02em;max-width:880px;margin:16px 0 16px}
  .a-head .desc{position:relative;font-size:clamp(16px,1.5vw,19px);color:var(--muted);max-width:720px}
  .byline{position:relative;display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:24px;font-size:13.5px;color:var(--muted)}
  .byline .av{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:#000;font-size:12px;font-weight:700}
  .byline b{color:var(--text);font-weight:600}
  .byline i{width:3px;height:3px;border-radius:50%;background:var(--muted)}
  .cover{position:relative;aspect-ratio:21/9;border-radius:22px;overflow:hidden;border:1px solid var(--line);background:var(--art);margin-bottom:48px}
  .cover img{width:100%;height:100%;object-fit:cover;display:block;opacity:0;transition:opacity .7s var(--ease)}
  .cover img.in{opacity:1}

  /* layout */
  .layout{display:grid;grid-template-columns:230px minmax(0,720px);gap:64px;justify-content:center}
  .toc{position:sticky;top:96px;align-self:start}
  .toc p{font-size:11.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
  .toc a{display:block;font-size:13.5px;color:var(--muted);padding:6px 0 6px 14px;border-left:2px solid var(--line);transition:color .2s,border-color .2s}
  .toc a:hover{color:var(--text)}
  .toc a.on{color:var(--accent-text);border-left-color:var(--accent)}
  .share{margin-top:22px;display:flex;gap:8px}
  .share button,.share a{height:34px;padding:0 14px;border-radius:999px;border:1px solid var(--line-2);background:var(--pill-bg);font-size:12.5px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:border-color .2s,color .2s}
  .share button:hover,.share a:hover{border-color:var(--accent);color:var(--accent-text)}

  /* prose */
  .prose{font-size:17px;line-height:1.75;color:var(--text-2)}
  .prose > *+*{margin-top:18px}
  .prose .lead{font-size:19px;line-height:1.65;color:var(--text)}
  .prose h2{font-size:26px;line-height:1.25;font-weight:600;color:var(--text);margin-top:44px;scroll-margin-top:90px}
  .prose h3{font-size:19px;font-weight:600;color:var(--text);margin-top:28px}
  .prose strong,.prose b{color:var(--text);font-weight:600}
  .prose a{color:var(--accent-text);text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(28,194,255,.4)}
  .prose ul,.prose ol{padding-left:22px}
  .prose li+li{margin-top:8px}
  .prose li::marker{color:var(--accent-text)}
  .prose code{font-size:.9em;padding:2px 6px;border-radius:6px;background:var(--ico-bg)}
  .prose table{width:100%;border-collapse:collapse;font-size:15px;margin-top:14px}
  .prose th{text-align:left;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:10px 12px;border-bottom:1px solid var(--line-2)}
  .prose td{padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}
  .table-wrap{overflow-x:auto}
  .example,.callout{border-radius:16px;padding:20px 22px;font-size:16px}
  .example{background:var(--card-bg);border:1px solid var(--line);box-shadow:var(--card-shadow)}
  .example > b:first-child,.callout > b:first-child{display:block;font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-text);margin-bottom:8px}
  .example > * + *{margin-top:10px}
  .callout{background:rgba(28,194,255,.07);border:1px solid rgba(28,194,255,.3)}
  .callout > b:first-child{display:inline;text-transform:none;letter-spacing:0;font-size:16px;color:var(--text);margin:0 4px 0 0}
  .takeaway{margin-top:36px!important;padding:20px 22px;border-radius:16px;background:linear-gradient(135deg,rgba(28,194,255,.14),rgba(78,123,255,.08));border:1px solid rgba(28,194,255,.35);color:var(--text)}
  .sources{margin-top:48px;padding-top:28px;border-top:1px solid var(--line)}
  .sources h2{font-size:18px!important;margin-top:0!important}
  .sources ol{font-size:14.5px;line-height:1.6}
  .sources a{word-break:break-word}
  .disclaimer{margin-top:20px;font-size:13px;color:var(--muted);line-height:1.6}

  /* related / pager / cta */
  .pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:64px 0 0}
  .pager a{display:block;padding:18px 20px;border-radius:16px;border:1px solid var(--line);background:var(--card-bg);transition:border-color .3s,transform .3s var(--ease)}
  .pager a:hover{border-color:rgba(28,194,255,.45);transform:translateY(-2px)}
  .pager small{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}
  .pager b{font-weight:600;line-height:1.35}
  .pager .next{text-align:right}
  .related{margin:72px 0 0}
  .related h2{font-size:clamp(26px,3vw,34px);font-weight:600;margin-bottom:22px}
  .rgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .card{display:flex;flex-direction:column;border-radius:18px;border:1px solid var(--line);background:var(--card-bg);padding:10px;box-shadow:var(--card-shadow);transition:border-color .3s,transform .4s var(--ease)}
  .card:hover{border-color:rgba(28,194,255,.45);transform:translateY(-4px)}
  .card .thumb{aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:var(--art)}
  .card .thumb img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .8s var(--ease)}
  .card:hover .thumb img{transform:scale(1.06)}
  .card .body{padding:14px 6px 6px}
  .card span{font-size:12px;font-weight:600;color:var(--accent-text)}
  .card h3{font-size:16.5px;font-weight:600;line-height:1.35;margin:6px 0 8px}
  .card p{font-size:13px;color:var(--muted)}
  .cta{position:relative;margin:80px 0 90px;padding:56px 28px;text-align:center;border-radius:24px;border:1px solid var(--line);background:var(--demo-bg);overflow:hidden;isolation:isolate}
  .cta::before{content:"";position:absolute;width:600px;height:600px;left:50%;top:-340px;transform:translateX(-50%);border-radius:50%;background:radial-gradient(circle,rgba(28,194,255,.3),transparent 65%);z-index:-1}
  .cta h2{font-size:clamp(26px,3.4vw,40px);font-weight:600;line-height:1.12;margin-bottom:12px}
  .cta p{color:var(--muted);max-width:460px;margin:0 auto 24px}
  .cta .btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
  .btn{display:inline-flex;align-items:center;height:46px;padding:0 22px;border-radius:999px;font-size:14.5px;font-weight:600;border:1px solid var(--line-2);background:var(--pill-bg);transition:all .3s var(--ease)}
  .btn:hover{border-color:var(--accent);color:var(--accent-text)}
  .btn.primary{background:var(--accent);border-color:var(--accent);color:#000;box-shadow:0 12px 30px -10px rgba(28,194,255,.6)}
  .btn.primary:hover{color:#000;filter:brightness(1.08)}
  footer{border-top:1px solid var(--line);padding:44px 0 24px;text-align:center}
  footer nav{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;margin:18px 0 26px;font-size:14px}
  footer nav a{color:var(--text-2)}
  footer nav a:hover{color:var(--accent-text)}
  footer .copy{border-top:1px solid var(--line);padding-top:18px;font-size:13px;color:var(--muted)}
  .toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);opacity:0;padding:12px 18px;border-radius:12px;background:var(--card);border:1px solid var(--line-2);box-shadow:0 16px 40px -12px rgba(0,0,0,.5);font-size:13.5px;font-weight:500;transition:all .4s var(--ease);z-index:100;pointer-events:none}
  .toast.on{opacity:1;transform:translate(-50%,0)}
  [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
  [data-reveal].in{opacity:1;transform:none}

  @media (max-width:1100px){.nav-links{position:static;transform:none;gap:22px;margin:0 auto}.layout{grid-template-columns:200px minmax(0,1fr);gap:40px}}
  @media (max-width:900px){.nav-links{display:none}.container,.nav-inner{padding:0 20px}.layout{grid-template-columns:1fr}.toc{position:static;padding:16px 18px;border-radius:14px;border:1px solid var(--line);background:var(--card-bg)}.rgrid{grid-template-columns:1fr 1fr}.cover{aspect-ratio:16/9}}
  @media (max-width:600px){.rgrid,.pager{grid-template-columns:1fr}.pager .next{text-align:left}.prose{font-size:16px}.prose h2{font-size:22px}.btn-login{padding:0 12px}.pill{padding:8px 14px}.pill .ico{display:none}}
  @media print{.nav,.progress,.toc,.related,.pager,.cta,footer,.share{display:none!important}.a-head{padding-top:0}body{background:#fff;color:#000}}
  @media (prefers-reduced-motion:reduce){[data-reveal]{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}