:root{
  --bg:#070a12;
  --panel:#111827;
  --panel2:#162033;
  --text:#eef4ff;
  --muted:#b8c4d8;
  --accent:#ef4444;
  --accent2:#38bdf8;
  --gold:#fbbf24;
  --line:rgba(255,255,255,.13);
  --shadow:0 20px 70px rgba(0,0,0,.35);
  --radius:22px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:radial-gradient(circle at 10% 0%,rgba(239,68,68,.22),transparent 28%),radial-gradient(circle at 90% 10%,rgba(56,189,248,.18),transparent 32%),linear-gradient(180deg,#06070c 0%,#0b1020 50%,#070a12 100%);color:var(--text);line-height:1.65}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:underline}.wrap{width:min(1180px,calc(100% - 32px));margin:0 auto}.topbar{position:sticky;top:0;z-index:10;background:rgba(7,10,18,.84);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.nav{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:12px 0}.brand{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:.3px}.kit{display:inline-grid;place-items:center;width:38px;height:30px;border-radius:9px;background:linear-gradient(135deg,#dc2626,#f87171);box-shadow:0 0 18px rgba(239,68,68,.35);font-size:13px}.links{display:flex;flex-wrap:wrap;gap:10px}.links a,.pill{padding:8px 12px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.06);color:var(--muted);font-size:14px}.links a:hover,.pill:hover{background:rgba(255,255,255,.12);text-decoration:none;color:#fff}.hero{padding:70px 0 34px;text-align:center}.eyebrow{display:inline-flex;gap:8px;align-items:center;color:#fecaca;background:rgba(239,68,68,.12);border:1px solid rgba(248,113,113,.35);border-radius:999px;padding:7px 13px;font-weight:800;text-transform:uppercase;font-size:12px;letter-spacing:.12em}h1{font-size:clamp(34px,6vw,76px);line-height:1.02;margin:20px 0 12px;letter-spacing:-.05em}h2{font-size:clamp(24px,3.2vw,38px);line-height:1.15;margin:0 0 12px;letter-spacing:-.03em}h3{font-size:22px;margin:0 0 8px}.subtitle{font-size:clamp(17px,2.2vw,23px);max-width:840px;margin:0 auto;color:var(--muted)}.hero-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:24px}.button{display:inline-flex;align-items:center;justify-content:center;padding:12px 16px;border-radius:14px;background:linear-gradient(135deg,#dc2626,#ef4444);box-shadow:0 12px 30px rgba(220,38,38,.28);font-weight:900}.button.secondary{background:rgba(255,255,255,.08);border:1px solid var(--line);box-shadow:none;color:#dbeafe}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card,.lesson-card{background:linear-gradient(180deg,rgba(255,255,255,.08),rgba(255,255,255,.045));border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.card{padding:18px}.card .num{color:#fca5a5;font-weight:900;font-size:13px;text-transform:uppercase;letter-spacing:.08em}.card p{color:var(--muted);margin:8px 0 14px}.meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.tag{font-size:12px;color:#dbeafe;background:rgba(56,189,248,.1);border:1px solid rgba(56,189,248,.22);padding:4px 8px;border-radius:999px}.searchbar{display:flex;gap:10px;margin:28px auto;max-width:780px}.searchbar input{width:100%;border-radius:16px;border:1px solid var(--line);background:rgba(255,255,255,.08);color:#fff;padding:14px 16px;font-size:16px;outline:none}.searchbar input::placeholder{color:#94a3b8}.section{padding:28px 0}.notice{padding:16px 18px;border-radius:18px;border:1px solid rgba(251,191,36,.35);background:rgba(251,191,36,.08);color:#fde68a}.lesson-layout{display:grid;grid-template-columns:260px 1fr;gap:22px;align-items:start;padding:28px 0}.toc{position:sticky;top:74px;padding:16px;border-radius:18px;border:1px solid var(--line);background:rgba(255,255,255,.06)}.toc strong{display:block;margin-bottom:10px}.toc a{display:block;color:var(--muted);font-size:14px;padding:6px 0}.toc a:hover{color:#fff}.lesson-card{padding:24px;margin-bottom:16px}.lesson-card p,.lesson-card li,.lesson-card dd{color:var(--muted)}.lesson-card ul,.lesson-card ol{padding-left:22px;margin:8px 0}.lesson-card dt{font-weight:900;color:#fff;margin-top:12px}.lesson-card dd{margin:4px 0 8px 0}.chapter-head{padding:42px 0 20px}.chapter-head h1{font-size:clamp(34px,5vw,62px)}.prevnext{display:flex;justify-content:space-between;gap:14px;margin:18px 0 44px}.prevnext a{flex:1;padding:14px;border:1px solid var(--line);border-radius:16px;background:rgba(255,255,255,.06);color:#dbeafe}.prevnext a:last-child{text-align:right}.footer{border-top:1px solid var(--line);margin-top:44px;padding:28px 0;color:#94a3b8}.footer-grid{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}.quiz-answer{display:none;margin-top:6px;padding:10px;border-radius:12px;background:rgba(34,197,94,.10);border:1px solid rgba(34,197,94,.24);color:#bbf7d0}.quiz-item button{margin-top:7px;border:1px solid var(--line);background:rgba(255,255,255,.08);color:#fff;border-radius:10px;padding:6px 9px;cursor:pointer}.progress{height:8px;background:rgba(255,255,255,.08);border-radius:999px;overflow:hidden;margin:16px 0}.progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,#ef4444,#38bdf8)}.callout{border-left:4px solid var(--accent);padding:12px 14px;background:rgba(239,68,68,.08);border-radius:12px;color:#fecaca}.small{font-size:13px;color:#94a3b8}.chapter-list{columns:2;column-gap:30px}.chapter-list a{display:block;margin:0 0 8px;color:#bfdbfe}@media (max-width:900px){.grid{grid-template-columns:1fr}.lesson-layout{grid-template-columns:1fr}.toc{position:relative;top:0}.links{display:none}.chapter-list{columns:1}h1{letter-spacing:-.03em}}
@media print{body{background:#fff;color:#111}.topbar,.toc,.hero-actions,.footer,.prevnext,.searchbar{display:none}.wrap{width:100%;max-width:none}.lesson-layout{display:block}.lesson-card,.card{box-shadow:none;border:1px solid #ddd;background:#fff}.lesson-card p,.lesson-card li,.lesson-card dd{color:#222}a{color:#111}}
.card-title{font-size:22px;line-height:1.25;margin:0 0 8px;font-weight:900;color:#fff}
.card .card-title{color:#fff}
.readaloud{position:fixed;right:16px;bottom:16px;z-index:80;display:flex;align-items:center;gap:8px;flex-wrap:wrap;max-width:min(460px,calc(100vw - 32px));padding:10px 12px;border:1px solid var(--line);border-radius:18px;background:rgba(7,10,18,.94);box-shadow:var(--shadow);backdrop-filter:blur(12px)}
.readaloud strong{font-size:13px;color:#fff}
.readaloud span{font-size:12px;color:var(--muted)}
.readaloud button{border:1px solid var(--line);background:rgba(255,255,255,.08);color:#fff;border-radius:999px;padding:6px 10px;font-weight:800;cursor:pointer}
.readaloud button:hover{background:rgba(255,255,255,.14)}
@media (max-width:700px){.readaloud{left:10px;right:10px;bottom:10px;justify-content:center}.readaloud strong,.readaloud span{width:100%;text-align:center}}
@media print{.readaloud{display:none}}