:root{color-scheme:dark;--bg:#081210;--panel:#0f1f1b;--panel2:#142823;--text:#edf8f3;--muted:#9fb7ad;--line:rgba(174,207,192,.18);--accent:#58e0ad;--amber:#f2b659}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;background:#081210}
body{margin:0;background:radial-gradient(circle at top left,rgba(88,224,173,.14),transparent 32%),linear-gradient(135deg,#07110f,#0d1917 58%,#11160e);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;line-height:1.6}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:1120px;margin:0 auto;padding:0 clamp(16px,5vw,40px)}
.site-header{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(7,17,15,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:12px;padding-bottom:12px}
.brand{color:var(--text);font-weight:800;font-size:1.1rem;letter-spacing:.2px;white-space:nowrap}.brand b{color:var(--accent)}
.nav{display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.nav a{color:var(--muted);padding:6px 10px;border-radius:8px;font-size:.92rem;font-weight:600}
.nav a:hover,.nav a.on{color:var(--text);background:rgba(255,255,255,.06);text-decoration:none}
.nav a[data-lane]::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--c);margin-right:6px;vertical-align:1px}
.menu-btn{display:none;background:none;border:1px solid var(--line);color:var(--text);border-radius:8px;padding:6px 10px;font:inherit}
@media(max-width:860px){.menu-btn{display:block}.nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;background:#081210;border-bottom:1px solid var(--line);padding:8px 16px 14px}.nav.open{display:flex}.nav a{padding:10px}}
.hero{padding:clamp(40px,8vw,84px) 0 28px}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.76rem;font-weight:700;color:var(--muted);margin:0 0 10px}
h1{font-size:clamp(2rem,5.4vw,3.4rem);line-height:1.08;margin:0 0 14px;letter-spacing:-.02em}
h2{font-size:clamp(1.35rem,3vw,1.8rem);line-height:1.2;margin:0 0 12px}
h3{font-size:1.08rem;line-height:1.3;margin:0 0 8px}
.lede{font-size:clamp(1.02rem,2vw,1.18rem);color:#c8d8d1;max-width:720px;margin:0}
.section{padding:28px 0}
.grid{display:grid;gap:14px}
.lanes{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.lane{position:relative;display:block;padding:20px;border-radius:16px;background:var(--panel);border:1px solid var(--line);color:var(--text);overflow:hidden}
.lane::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:var(--c)}
.lane:hover{text-decoration:none;border-color:var(--c)}
.lane .k{font-size:.78rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--c)}
.lane h3{margin:6px 0 6px;font-size:1.2rem}.lane p{color:var(--muted);margin:0;font-size:.95rem}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px}
.item{border-left:4px solid var(--c);}
.item p{margin:0 0 10px;color:#c8d8d1}.item .do{background:rgba(255,255,255,.04);border-radius:10px;padding:10px 12px;color:var(--text);font-size:.95rem}
.item .do b{color:var(--c)}
.src{margin-top:10px;font-size:.86rem;color:var(--muted)}.src a{margin-right:10px}
.lane-head{display:flex;align-items:baseline;gap:10px;margin:34px 0 12px}
.lane-head .dot{width:12px;height:12px;border-radius:50%;background:var(--c);flex:none;transform:translateY(-1px)}
.lane-head h2{margin:0}.lane-head a{margin-left:auto;font-size:.9rem;white-space:nowrap}
.pill{display:inline-block;font-size:.78rem;font-weight:700;padding:3px 10px;border-radius:999px;background:rgba(255,255,255,.06);color:var(--muted);margin:0 6px 6px 0}
.levels{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.level ul{margin:0 0 10px;padding-left:18px;color:#c8d8d1}.level .lvl{font-weight:800;color:var(--c);text-transform:uppercase;letter-spacing:.1em;font-size:.78rem}
.signup{display:grid;gap:16px;grid-template-columns:1.2fr 1fr;align-items:center;background:linear-gradient(135deg,rgba(88,224,173,.10),rgba(185,140,255,.08));border:1px solid var(--line);border-radius:18px;padding:clamp(18px,4vw,30px)}
@media(max-width:760px){.signup{grid-template-columns:1fr}}
.signup form{display:flex;gap:8px;flex-wrap:wrap}
.signup input{flex:1 1 200px;min-width:0;background:#091613;color:var(--text);border:1px solid var(--line);border-radius:10px;padding:12px 14px;font:inherit}
.signup button,.btn{background:var(--accent);color:#04120d;border:0;border-radius:10px;padding:12px 18px;font:inherit;font-weight:800;cursor:pointer;display:inline-block}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--line)}.btn:hover{text-decoration:none;filter:brightness(1.08)}
.covers{margin:0;padding-left:18px;color:#c8d8d1}
.note{font-size:.86rem;color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
footer{border-top:1px solid var(--line);margin-top:48px;padding:26px 0 40px;color:var(--muted);font-size:.9rem}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 22px;justify-content:space-between}footer nav a{margin-right:14px}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.toc a{border:1px solid var(--line);border-radius:999px;padding:6px 12px;color:var(--text);font-size:.9rem;font-weight:600}
.toc a::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--c);margin-right:6px}
.toc a:hover{border-color:var(--c);text-decoration:none}