:root{--bg:#f6f7f9;--surface:#fff;--text:#1a2233;--muted:#67718a;--border:#dde1ea;--primary:#1450a3;--primary-text:#fff;--good:#157347;--good-bg:#e3f5ec;--bad:#b02a37;--bad-bg:#fbe9eb;--flag:#b8860b;--shadow:0 1px 3px #141e3c14;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--bg:#12161f;--surface:#1b2230;--text:#e8ebf2;--muted:#98a2b8;--border:#303a4e;--primary:#4a8fe0;--primary-text:#0c1320;--good:#4cc38a;--good-bg:#14301f;--bad:#e5717c;--bad-bg:#3a1a20;--flag:#e0b04a;--shadow:none}}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.5}.page{max-width:720px;margin:0 auto;padding:16px 16px 48px}h1{margin:.5em 0;font-size:1.6rem}h2{margin:1.2em 0 .4em;font-size:1.15rem}a{color:var(--primary)}.muted{color:var(--muted)}.button{border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;text-align:center;border-radius:8px;padding:10px 16px;font-size:.95rem;text-decoration:none;display:inline-block}.button.primary{background:var(--primary);border-color:var(--primary);color:var(--primary-text);font-weight:600}.button.small{padding:6px 10px;font-size:.85rem}.button.big{padding:14px 24px;font-size:1.05rem}.button.wide{width:100%}.button.danger{color:var(--bad)}.button.flagged{color:var(--flag);border-color:var(--flag)}.button:disabled{opacity:.45;cursor:default}.row-buttons{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.hero{text-align:center;padding:24px 0 8px}.home-stats{font-size:1.05rem}.home-nav{gap:12px;margin-top:16px;display:grid}.home-card{background:var(--surface);border:1px solid var(--border);color:var(--text);box-shadow:var(--shadow);border-radius:12px;padding:16px;text-decoration:none;display:block}.home-card-title{color:var(--primary);font-size:1.1rem;font-weight:700;display:block}.home-card-sub{color:var(--muted);font-size:.9rem}.topic-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px;display:grid}.topic-card{background:var(--surface);border:1px solid var(--border);color:var(--text);box-shadow:var(--shadow);border-radius:12px;flex-direction:column;gap:4px;padding:14px;text-decoration:none;display:flex}.topic-card.disabled{opacity:.55;pointer-events:none}.topic-name{font-weight:700}.topic-meta{align-items:center;gap:8px;font-size:.85rem;display:flex}.section-badge{border-radius:99px;padding:1px 8px;font-size:.78rem;font-weight:700;display:inline-block}.section-badge.sA{color:#7a5a00;background:#fff2cc}.section-badge.sB{color:#174a8b;background:#d8e7fb}.section-badge.sC{color:#4b3585;background:#e2d9f3}@media (prefers-color-scheme:dark){.section-badge.sA{color:#f0d47a;background:#4a3d10}.section-badge.sB{color:#9cc4f0;background:#17304e}.section-badge.sC{color:#c3b2ec;background:#33284e}}.study-section{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:12px;margin:12px 0;padding:4px 18px 10px}.study-section ul,.study-section ol{margin:8px 0;padding-left:20px}.study-section li{margin:6px 0}.question-card{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:12px;margin:12px 0;padding:16px}.question-image{text-align:center;margin-bottom:8px}.question-image img{object-fit:contain;border:1px solid var(--border);background:#fff;border-radius:8px;width:140px;height:140px}.question-text{margin:6px 0 12px;font-weight:600}.options{gap:8px;display:grid}.option{text-align:left;border:1.5px solid var(--border);background:var(--bg);width:100%;color:var(--text);cursor:pointer;border-radius:8px;align-items:flex-start;gap:10px;padding:10px 12px;font-size:.95rem;display:flex}.option:disabled{cursor:default;opacity:1}.option-letter{color:var(--muted);font-weight:700}.option.selected{border-color:var(--primary);background:color-mix(in srgb, var(--primary) 12%, var(--bg))}.option.correct{border-color:var(--good);background:var(--good-bg)}.option.wrong{border-color:var(--bad);background:var(--bad-bg)}.explanation{border-radius:8px;margin-top:12px;padding:12px;font-size:.92rem}.explanation.good{background:var(--good-bg)}.explanation.bad{background:var(--bad-bg)}.practice-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;display:flex}.big-score{margin:8px 0;font-size:2.2rem;font-weight:800}.exam-rules li{margin:6px 0}.resume-box{background:var(--surface);border:1px solid var(--primary);border-radius:12px;margin:12px 0;padding:12px 16px}.exam-header{z-index:5;background:var(--bg);border-bottom:1px solid var(--border);align-items:center;gap:8px;padding:10px 0;display:flex;position:sticky;top:0}.exam-header .muted{text-align:center;flex:1}.timer{font-variant-numeric:tabular-nums;font-size:1.15rem;font-weight:800}.timer.urgent{color:var(--bad)}.exam-footer{justify-content:space-between;margin-top:12px;display:flex}.navigator-grid{grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:6px;padding:12px 0;display:grid}.nav-cell{border:1px solid var(--border);background:var(--surface);color:var(--muted);cursor:pointer;border-radius:6px;padding:8px 0;font-size:.85rem}.nav-cell.answered{background:color-mix(in srgb, var(--primary) 18%, var(--surface));color:var(--text);border-color:var(--primary)}.nav-cell.flag{box-shadow:inset 0 -3px 0 var(--flag)}.nav-cell.current{outline:2px solid var(--primary)}.modal-backdrop{z-index:20;background:#0a0e198c;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.modal{background:var(--surface);border-radius:12px;width:100%;max-width:420px;padding:20px}.result-banner{text-align:center;border-radius:12px;margin:12px 0;padding:20px}.result-banner.pass{background:var(--good-bg);color:var(--good)}.result-banner.fail{background:var(--bad-bg);color:var(--bad)}.result-banner h1{letter-spacing:.1em;margin:0}.result-banner p{color:var(--text)}.breakdown{gap:8px;display:grid}.breakdown-row{align-items:center;gap:10px;display:flex}.breakdown-name{flex:0 0 40%;font-size:.9rem}.bar{background:var(--border);border-radius:99px;flex:1;height:10px;overflow:hidden}.bar-fill{background:var(--primary);border-radius:99px;height:100%}.breakdown-score{font-variant-numeric:tabular-nums;text-align:right;min-width:48px;font-size:.9rem}.review-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-top:16px;display:flex}.pass-text{color:var(--good);font-weight:700}.fail-text{color:var(--bad);font-weight:700}.history-table{border-collapse:collapse;width:100%;font-size:.92rem}.history-table th,.history-table td{text-align:left;border-bottom:1px solid var(--border);padding:8px 6px}@media (width<=480px){.breakdown-name{flex-basis:34%}.history-table{font-size:.82rem}}