:root{
  --bg:#f6f5f0;--paper:#fff;--ink:#1d2a32;--muted:#55646e;--line:#dde3e2;
  --accent:#15665f;--accent-2:#0e4e48;--accent-soft:#e5f0ec;--on-accent:#fff;
  --note:#8a5210;--note-soft:#fbf1de;--note-line:#e8c88d;
  --shadow:0 1px 2px rgba(20,40,40,.05),0 12px 32px -12px rgba(20,50,50,.18);
  --radius:16px;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
  --serif:ui-serif,"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0f1617;--paper:#162022;--ink:#e4ecec;--muted:#a3b3b6;--line:#2c3c3f;
  --accent:#86d0bd;--accent-2:#a8e2d2;--accent-soft:#1b3631;--on-accent:#0c1414;
  --note:#f0c27a;--note-soft:#2b2416;--note-line:#665026;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 12px 32px -12px rgba(0,0,0,.6);
}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important}}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.6;font-size:17px}
a{color:var(--accent)}
a:focus-visible,.btn:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:8px}
h1,h2,h3{line-height:1.2;margin:0 0 .5em}
h1,h2{font-family:var(--serif);font-weight:700;letter-spacing:-.01em}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:8px;background:var(--paper);padding:8px 14px;border-radius:8px;z-index:20}
.skip:focus{left:12px}

/* nav */
.nav{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:700;font-size:19px;letter-spacing:-.01em}
.logo svg{width:32px;height:32px;flex:none}
.nav-links{display:flex;align-items:center;gap:22px}
.nav-links a:not(.btn){color:var(--muted);text-decoration:none;font-size:15px}
.nav-links a:not(.btn):hover{color:var(--ink)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 22px;border-radius:999px;font-weight:600;font-size:16px;text-decoration:none;border:1px solid transparent;transition:transform .15s,background .15s,border-color .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:var(--on-accent)}
.btn-primary:hover{background:var(--accent-2)}
.btn-ghost{border-color:var(--line);color:var(--ink);background:var(--paper)}
.btn-ghost:hover{border-color:var(--accent)}
.btn-light{background:#fff;color:#0e4e48}
.btn-sm{padding:8px 16px;font-size:14px}

/* hero */
.hero{padding:72px 0 64px}
.hero-grid{display:grid;grid-template-columns:1.12fr 1fr;gap:56px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--accent);background:var(--accent-soft);padding:6px 12px;border-radius:999px}
.badge i{width:8px;height:8px;border-radius:50%;background:var(--accent)}
.hero h1{font-size:clamp(36px,4.9vw,56px);margin:20px 0 18px}
.hl{color:var(--accent)}
.lead{font-size:clamp(17px,1.6vw,19px);color:var(--muted);max-width:36em;margin:0 0 28px}
.lead strong{color:var(--ink);font-weight:600}
.cta-row{display:flex;flex-wrap:wrap;gap:12px}
.note{margin:18px 0 0;font-size:14px;color:var(--muted)}

/* mock */
.mock{margin:0;background:var(--paper);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:16px;font-size:15px}
.mock-bar{display:flex;align-items:center;gap:10px;padding:2px 4px 14px;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.mock-title{font-weight:600;color:var(--ink);flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mock-lang{background:var(--accent-soft);color:var(--accent);padding:3px 9px;border-radius:999px;font-weight:600;white-space:nowrap}
.live{display:inline-flex;align-items:center;gap:6px;font-weight:700;color:#c2410c;text-transform:uppercase;letter-spacing:.06em;font-size:11px}
.live i{width:8px;height:8px;border-radius:50%;background:#ea580c;animation:pulse 1.6s infinite}
@keyframes pulse{50%{opacity:.35}}
.subs{list-style:none;margin:0;padding:14px 0 6px}
.sub{position:relative;padding:12px 14px;border-radius:10px}
.sub p{margin:0}
.sub.past p{color:var(--muted)}
.sub.now{background:var(--accent-soft)}
.sub.now p{font-weight:600;font-size:17px}
.caret{display:inline-block;width:2px;height:1em;background:var(--accent);margin-left:3px;vertical-align:-2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.sidenote{margin:10px 0 4px;background:var(--note-soft);border:1px solid var(--note-line);border-left:4px solid var(--note);border-radius:12px;padding:11px 14px}
.sn-label{display:block;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--note);margin-bottom:4px}
.sidenote p{margin:0;font-size:15px}
.mock figcaption{margin-top:12px;font-size:12px;color:var(--muted);text-align:center}

/* sections */
section{padding:88px 0}
.band{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:720px;margin:0 0 44px}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.section-head h2{font-size:clamp(28px,3.6vw,40px)}
.section-head p{color:var(--muted);font-size:18px;margin:0}
.grid{display:grid;gap:20px}
.grid.four{grid-template-columns:repeat(4,1fr)}
.grid.three{grid-template-columns:repeat(3,1fr)}
.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.card h3{font-size:18px}
.card p{margin:0;color:var(--muted);font-size:15.5px}
.card.plain{background:var(--paper)}
.tag{display:inline-block;font-size:12px;font-weight:700;color:var(--accent);background:var(--accent-soft);padding:3px 10px;border-radius:999px;margin-bottom:14px}

.layers{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.layer{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.num{display:block;font-family:var(--serif);font-size:34px;font-weight:700;color:var(--accent);line-height:1;margin-bottom:14px}
.layer h3{font-size:20px}
.sub-lead{margin:0 0 14px;font-weight:600;color:var(--ink);font-size:15.5px}
.layer ul{margin:0;padding:0;list-style:none}
.layer li{position:relative;padding-left:22px;margin:0 0 10px;color:var(--muted);font-size:15.5px}
.layer li::before{content:"";position:absolute;left:2px;top:.62em;width:8px;height:8px;border-radius:2px;background:var(--accent);opacity:.75}

.grow{margin-top:40px;background:var(--accent-soft);border-radius:20px;padding:30px}
.grow h3{font-size:20px;margin-bottom:20px}
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:s}
.steps li{position:relative;background:var(--paper);border-radius:14px;padding:18px 18px 18px;counter-increment:s}
.steps li::before{content:counter(s);display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--accent);color:var(--on-accent);font-size:13px;font-weight:700;margin-bottom:10px}
.steps b{display:block;margin-bottom:4px}
.steps span{color:var(--muted);font-size:14.5px}
.fine{margin:16px 0 0;font-size:14px;color:var(--muted)}

.timeline{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative}
.timeline li{position:relative;padding-top:30px}
.timeline li::before{content:"";position:absolute;top:6px;left:0;width:14px;height:14px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 5px var(--accent-soft)}
.timeline li::after{content:"";position:absolute;top:12px;left:26px;right:-14px;height:2px;background:var(--line)}
.timeline li:last-child::after{display:none}
.timeline h3{font-size:18px}
.timeline p{margin:0;color:var(--muted);font-size:15.5px}
.aside-line{margin:36px 0 0;padding:14px 18px;border-radius:12px;background:var(--bg);border:1px dashed var(--line);color:var(--muted);font-size:15px}

.slim{padding:64px 0}
.workspace{display:grid;grid-template-columns:1fr 1.5fr;gap:48px;align-items:start}
.workspace h2{font-size:clamp(26px,3.2vw,34px);margin:0}
.workspace p{margin:0;color:var(--muted);font-size:17px}
.pills{list-style:none;margin:18px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.pills li{font-size:13.5px;font-weight:600;color:var(--accent);background:var(--accent-soft);padding:6px 12px;border-radius:999px}
.nowrap{white-space:nowrap}

.cta-section{padding:88px 0 96px}
.cta-box{background:linear-gradient(135deg,#15665f,#0d4a44 60%,#123c47);color:#fff;border-radius:24px;padding:56px 40px;text-align:center}
.cta-box h2{font-size:clamp(26px,3.4vw,38px)}
.cta-box p{max-width:600px;margin:0 auto 26px;color:#d8ece6;font-size:17px}
.cta-box .cta-note{margin:16px auto 0;font-size:13.5px;color:#b5d6cd}

footer{border-top:1px solid var(--line);padding:28px 0;font-size:14px;color:var(--muted)}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
footer nav{display:flex;gap:20px}
footer a{color:var(--muted)}

/* prose pages */
.prose{max-width:720px;margin:0 auto;padding:64px 24px 88px}
.prose h1{font-size:clamp(32px,4.4vw,44px)}
.prose h2{font-size:22px;margin-top:1.8em}
.prose p,.prose li{color:var(--muted)}
.updated{font-size:14px}
.center{text-align:center}
.notfound{min-height:70vh;display:flex;flex-direction:column;justify-content:center}

/* responsive */
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .grid.four,.steps{grid-template-columns:repeat(2,1fr)}
  .layers,.grid.three{grid-template-columns:1fr 1fr}
  .layers .layer:last-child{grid-column:1/-1}
  .timeline{grid-template-columns:1fr 1fr;row-gap:32px}
  .workspace{grid-template-columns:1fr;gap:16px}
  .timeline li::after{display:none}
}
@media (max-width:680px){
  body{font-size:16px}
  .nav-links a:not(.btn){display:none}
  .hero{padding:44px 0 48px}
  section{padding:64px 0}
  .grid.four,.grid.three,.layers,.steps,.timeline{grid-template-columns:1fr}
  .layers .layer:last-child{grid-column:auto}
  .timeline li{padding:0 0 0 30px}
  .timeline li::before{top:5px}
  .timeline li::after{display:block;top:26px;bottom:-26px;left:6px;right:auto;width:2px;height:auto}
  .timeline li:last-child::after{display:none}
  .workspace{grid-template-columns:1fr;gap:16px}
  .mock{padding:12px}
  .mock-lang{display:none}
  .grow{padding:22px}
  .cta-box{padding:40px 22px}
  .btn{width:100%}
  .nav .btn{width:auto}
}