@charset "UTF-8";:root{color-scheme:light;--bg: #f8fafc;--surface: #ffffff;--text: #0f172a;--muted: #64748b;--primary: #0f766e;--primary-600: #0d5f58;--primary-bg: #ccfbf1;--accent: #2dd4bf;--danger: #dc2626;--danger-strong: #991b1b;--danger-bg: #fee2e2;--danger-bg-soft: #fef2f2;--danger-border: #fecaca;--success: #16a34a;--success-strong: #166534;--success-bg: #dcfce7;--success-border: #bbf7d0;--warn: #d97706;--warn-strong: #92400e;--warn-bg: #fef3c7;--warn-border: #fbbf24;--info: #0369a1;--info-strong: #0c4a6e;--info-bg: #f0f9ff;--info-border: #bae6fd;--indigo: #3730a3;--indigo-bg: #e0e7ff;--border: #e2e8f0;--surface-hover: #f1f5f9;--surface-2: #f8fafc;--on-primary: #fff;--band-high: #0f766e;--band-medium: #0369a1;--band-low: #64748b;--mnemonic-bg: #fef3c7;--mnemonic-border: #fbbf24;--solution-bg: #ecfeff;--solution-border: #22d3ee;--radius: 10px;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);--shadow: 0 4px 14px rgba(15, 23, 42, .08)}.dark{color-scheme:dark;--bg: #0f172a;--surface: #1e293b;--text: #f8fafc;--muted: #94a3b8;--border: #334155;--primary-bg: #134e4a;--success: #4ade80;--success-strong: #bbf7d0;--success-bg: #052e16;--success-border: #166534;--danger-strong: #fca5a5;--danger-bg: #450a0a;--danger-bg-soft: #2d0b0b;--danger-border: #7f1d1d;--warn-strong: #fde68a;--warn-bg: #451a03;--warn-border: #b45309;--info: #7dd3fc;--info-strong: #bae6fd;--info-bg: #0c4a6e;--info-border: #075985;--indigo: #c7d2fe;--indigo-bg: #312e81;--surface-hover: #334155;--surface-2: #0f172a;--mnemonic-bg: #423920;--mnemonic-border: #78350f;--solution-bg: #164e63;--solution-border: #0891b2;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow: 0 4px 14px rgba(0, 0, 0, .4)}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}h1,h2,h3,h4{color:var(--text);margin:0 0 .5em}h1{font-size:28px;font-weight:700;letter-spacing:-.01em}h2{font-size:22px;font-weight:650}h3{font-size:17px;font-weight:600}p{color:var(--text);margin:0 0 .75em}.muted{color:var(--muted)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm)}@media(max-width:768px){.card{padding:16px}}.page-container{max-width:720px;margin:0 auto}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:14px;font-weight:600;cursor:pointer;text-decoration:none;transition:transform .12s ease,background .12s ease,border-color .12s ease}.btn:hover:not(:disabled){background:var(--surface-hover)}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}.btn.primary:hover:not(:disabled){background:var(--primary-600)}.btn.ghost{background:transparent}.btn.danger{color:var(--danger);border-color:var(--danger-border)}.grid{display:grid;gap:16px}@media(max-width:768px){.grid{grid-template-columns:1fr!important}}.grid.cols-2{grid-template-columns:repeat(2,1fr)}.grid.cols-3{grid-template-columns:repeat(3,1fr)}.badge{display:inline-block;padding:2px 8px;font-size:11px;font-weight:600;border-radius:999px;letter-spacing:.04em;text-transform:uppercase;background:var(--border);color:var(--text)}.badge.high{background:var(--primary-bg);color:var(--primary)}.badge.medium{background:var(--info-bg);color:var(--info)}.badge.low{background:var(--surface-hover);color:var(--muted)}.mnemonic{background:var(--mnemonic-bg);border-left:4px solid var(--mnemonic-border);padding:12px 16px;border-radius:6px}.solution{background:var(--solution-bg);border-left:4px solid var(--solution-border);padding:12px 16px;border-radius:6px}.option{display:block;width:100%;text-align:left;border:1px solid var(--border);background:var(--surface);padding:12px 16px;border-radius:8px;margin:8px 0;cursor:pointer;font:inherit;color:inherit;transition:border-color .12s,background .12s,transform .12s}.option:hover{background:var(--surface-2)}.option.selected{border-color:var(--primary);background:var(--primary-bg)}.option.correct{border-color:var(--success);background:var(--success-bg)}.option.wrong{border-color:var(--danger);background:var(--danger-bg)}.option .k{font-weight:700;margin-right:8px;color:var(--muted)}.progress-row{display:flex;gap:4px;flex-wrap:wrap;margin:12px 0}.progress-row .pip{width:26px;height:26px;border-radius:6px;background:var(--border);color:var(--muted);display:grid;place-items:center;font-size:11px;font-weight:600;cursor:pointer;border:2px solid transparent}.progress-row .pip.answered{background:var(--primary-bg);color:var(--primary)}.progress-row .pip.flagged{border-color:var(--warn-border)}.progress-row .pip.current{outline:2px solid var(--primary);outline-offset:1px}.progress-row .pip.correct{background:var(--success-border);color:var(--success-strong)}.progress-row 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