:root{--bg:#fbfaf7;--surface:#fff;--text:#1f2937;--muted:#667085;--line:#e8e1d7;--accent:#7c3aed;--accent2:#f97316;--soft:#f4efff;--danger:#b42318;--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6}a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:3px}.container{width:min(1040px,calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:50;background:rgba(251,250,247,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.header-inner{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-weight:800;color:var(--text);text-decoration:none}.nav{display:flex;gap:18px;overflow-x:auto;white-space:nowrap}.nav a{color:var(--muted);font-size:14px;font-weight:650;text-decoration:none}.hero{padding:72px 0 34px;text-align:center}.eyebrow{display:inline-flex;padding:7px 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface);font-size:12px;font-weight:700;color:var(--muted)}h1{font-size:clamp(38px,7vw,68px);line-height:1.02;letter-spacing:-.045em;margin:20px auto 18px;max-width:850px}h2{font-size:clamp(25px,4vw,38px);line-height:1.15;letter-spacing:-.025em}h3{line-height:1.25}.lead{font-size:clamp(17px,2vw,20px);color:var(--muted);max-width:760px;margin:auto}.notice{margin:28px auto 0;max-width:820px;padding:18px 20px;border:1px solid #fed7aa;background:#fff7ed;border-radius:16px;text-align:left;color:#9a3412;font-size:14px}.quiz-shell{margin:36px auto 70px;display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:24px;align-items:start}.quiz-card,.sidebar-card,.content-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 35px 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