:root{--bg:#030709;--panel:#071015;--panel2:#0a1418;--ink:#dce7e6;--muted:#8ea2a7;--faint:#61767c;--cyan:#58e4fa;--emerald:#58e6a6;--copper:#e9b97d;--line:#20343a;--line2:#14262c;--ivory:#f0eadf;--warn:#e9b97d}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 72% 8%,rgba(88,228,250,.045),transparent 26rem),linear-gradient(180deg,#020506,#071014 48%,#020506);color:var(--ink);font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.55}.topbar{position:sticky;top:0;z-index:20;min-height:64px;padding:.65rem clamp(.9rem,3vw,2rem);display:flex;gap:1rem;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:rgba(3,8,10,.94);backdrop-filter:blur(14px)}.brand{display:flex;align-items:center;gap:.75rem}.hg{width:38px;height:38px;border:1px solid rgba(88,228,250,.38);border-radius:50%;display:grid;place-items:center;font-family:Georgia,serif;color:var(--cyan)}.brand strong{display:block;font:400 1rem Georgia,serif;color:var(--ivory)}.brand span{display:block;color:var(--faint);font-size:.55rem;letter-spacing:.12em;text-transform:uppercase}.topnav{display:flex;gap:.45rem;flex-wrap:wrap;justify-content:flex-end}.topnav a,.topnav button{border:1px solid var(--line);background:#061014;color:#b8c8ca;text-decoration:none;padding:.48rem .7rem;font-size:.63rem;letter-spacing:.07em;text-transform:uppercase}.topnav a:hover,.topnav button:hover{border-color:var(--cyan);color:#e9fdff}.shell{max-width:1180px;margin:auto;padding:clamp(1.2rem,4vw,3.5rem) clamp(1rem,3vw,2.2rem) 6rem}.hero{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:clamp(1rem,3vw,2rem);align-items:start;border-bottom:1px solid var(--line);padding-bottom:2rem}.kicker{font-size:.62rem;letter-spacing:.18em;text-transform:uppercase;color:var(--cyan)}h1,h2,h3{font-family:Georgia,serif;font-weight:400;color:var(--ivory)}h1{font-size:clamp(2.5rem,6vw,5rem);line-height:.92;margin:.65rem 0 1rem}h2{font-size:clamp(1.55rem,3vw,2.2rem);margin:2.3rem 0 .7rem;border-top:1px solid var(--line2);padding-top:1.4rem}h3{font-size:1.2rem;margin:1.5rem 0 .45rem}.lead{font-size:clamp(.92rem,1.5vw,1.08rem);color:#acbdbf;max-width:44rem}.status{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem;margin-top:1.2rem}.status div{border:1px solid var(--line2);padding:.7rem;background:rgba(255,255,255,.012)}.status small,.watch-card small{display:block;color:#6d858c;font-size:.52rem;text-transform:uppercase;letter-spacing:.11em}.status strong{display:block;margin-top:.25rem;color:#d7e4e3;font-size:.72rem}.viz-card{border:1px solid rgba(88,228,250,.18);background:linear-gradient(145deg,rgba(88,228,250,.035),rgba(3,8,11,.92));box-shadow:0 20px 70px rgba(0,0,0,.28);padding:1rem}.viz-head{display:flex;justify-content:space-between;align-items:start;gap:.8rem;border-bottom:1px solid var(--line2);padding-bottom:.7rem;margin-bottom:.7rem}.viz-head strong{font:400 1.05rem Georgia,serif;color:var(--ivory)}.viz-head span{font-size:.58rem;color:#72868c;text-transform:uppercase;letter-spacing:.1em}.viz-card canvas{display:block;width:100%;height:330px;background:linear-gradient(rgba(83,115,126,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(83,115,126,.04) 1px,transparent 1px),#03090c;background-size:32px 32px;border:1px solid var(--line2)}.viz-controls{display:flex;gap:.45rem;margin-top:.7rem}.viz-controls button{border:1px solid var(--line);background:#061014;color:#cbd8d8;padding:.45rem .7rem}.watch-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.55rem;margin-top:.8rem}.watch-card{border:1px solid var(--line2);padding:.65rem;background:rgba(3,9,12,.7)}.watch-card span{display:block;color:#aebfc0;font-size:.67rem;line-height:1.45;margin-top:.24rem}.lesson{max-width:920px;margin-top:2rem}.lesson p,.lesson li{color:#aababc}.lesson strong{color:#e5e2d9}.lesson code{color:#b9f4fb;background:#071319;padding:.08rem .28rem;border:1px solid #16313a;font-size:.92em}.lesson ul{padding-left:1.25rem}.lesson li+li{margin-top:.35rem}.lesson blockquote{border-left:2px solid var(--copper);padding-left:1rem;color:#c9b99f}.equation-callout{margin:1rem 0;padding:1rem;border:1px solid rgba(88,228,250,.2);background:rgba(88,228,250,.025);font-family:Georgia,serif;color:#e1eceb}.lesson table{width:100%;border-collapse:collapse}.lesson td,.lesson th{border:1px solid var(--line2);padding:.55rem;text-align:left}.bottomnav{margin-top:3rem;padding-top:1rem;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr auto 1fr;gap:.7rem;align-items:center}.bottomnav a{color:#a7cdd2;text-decoration:none;border:1px solid var(--line);padding:.7rem .8rem;background:#061014}.bottomnav a:last-child{text-align:right}.return-card{margin:2rem 0 0;border:1px solid rgba(88,230,166,.22);background:rgba(88,230,166,.025);padding:1rem}.return-card strong{font:400 1.2rem Georgia,serif;color:var(--ivory)}.return-card p{margin:.35rem 0 .8rem;color:#9fb2af}.return-card a,.return-card button{display:inline-block;margin-right:.4rem;border:1px solid rgba(88,230,166,.35);background:#07130f;color:#c9f2dd;text-decoration:none;padding:.6rem .8rem}.index-hero{max-width:760px}.index-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.7rem;margin-top:1.5rem}.index-card{display:block;text-decoration:none;border:1px solid var(--line);background:linear-gradient(145deg,rgba(88,228,250,.025),rgba(3,9,12,.8));padding:1rem;min-height:150px}.index-card:hover{border-color:rgba(88,228,250,.5)}.index-card .roman{font:400 1.5rem Georgia,serif;color:var(--cyan)}.index-card strong{display:block;color:var(--ivory);font-family:Georgia,serif;font-weight:400;font-size:1.05rem;margin:.35rem 0}.index-card p{font-size:.7rem;color:#83979c}.notice{border-left:2px solid var(--copper);padding:.75rem .9rem;background:rgba(233,185,125,.025);color:#b8b0a4;font-size:.72rem;margin:1rem 0}.page-meta{font-size:.64rem;color:#6f858b;margin-top:.7rem}@media(max-width:900px){.hero{grid-template-columns:1fr}.index-grid{grid-template-columns:repeat(2,1fr)}.watch-grid{grid-template-columns:1fr}.viz-card canvas{height:300px}}@media(max-width:600px){.topbar{position:static;align-items:flex-start}.topnav{justify-content:flex-start}.status{grid-template-columns:1fr}.index-grid{grid-template-columns:1fr}.viz-card canvas{height:260px}.bottomnav{grid-template-columns:1fr}.bottomnav a:last-child{text-align:left}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}