:root{--bg: #0c0f14;--surface: #161a22;--surface2: #1e232d;--border: #2a3040;--text: #e8eaf0;--text-dim: #8891a4;--accent: #6c9bff;--accent-dim: rgba(108, 155, 255, .12);--correct: #4ade80;--correct-bg: rgba(74, 222, 128, .08);--correct-border: rgba(74, 222, 128, .3);--wrong: #f87171;--wrong-bg: rgba(248, 113, 113, .08);--wrong-border: rgba(248, 113, 113, .3);--gold: #fbbf24;--gold-dim: rgba(251, 191, 36, .12)}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{min-height:100dvh}body{font-family:DM Sans,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);line-height:1.55;overflow-x:hidden;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}a{color:inherit;text-decoration:none}.app{max-width:640px;margin:0 auto;padding:16px 16px 120px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 32px;border:none;border-radius:12px;font-family:DM Sans,sans-serif;font-size:15px;font-weight:600;cursor:pointer;transition:all .2s;-webkit-appearance:none;text-decoration:none}.btn-primary{background:var(--accent);color:#0c0f14}.btn-primary:active{transform:scale(.97);opacity:.9}.btn-secondary{background:var(--surface2);color:var(--text);border:1px solid var(--border)}.btn-secondary:active{background:var(--border)}.btn-sm{padding:10px 20px;font-size:13px;border-radius:10px}.home-header{text-align:center;padding:32px 16px 24px}.home-header .badge{display:inline-block;font-family:JetBrains Mono,monospace;font-size:11px;text-transform:uppercase;letter-spacing:2px;color:var(--accent);background:var(--accent-dim);padding:6px 14px;border-radius:20px;margin-bottom:14px}.home-header h1{font-size:28px;font-weight:700;letter-spacing:-.5px;line-height:1.2;margin-bottom:8px}.home-header h1 span{color:var(--accent)}.home-header p{color:var(--text-dim);font-size:14px}.course-section{margin-top:24px}.course-section .course-code{font-family:JetBrains Mono,monospace;font-size:11px;color:var(--text-dim);text-transform:uppercase;letter-spacing:2px;margin-bottom:4px}.course-section h2{font-size:18px;font-weight:600;margin-bottom:14px}.unit-list{display:flex;flex-direction:column;gap:10px}.unit-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:16px 18px;cursor:pointer;transition:all .15s}.unit-card:active{transform:scale(.99);border-color:var(--accent)}.unit-card .uc-num{font-family:JetBrains Mono,monospace;font-size:11px;color:var(--accent);text-transform:uppercase;letter-spacing:1.5px;margin-bottom:4px}.unit-card .uc-title{font-size:16px;font-weight:600;margin-bottom:6px}.unit-card .uc-meta{font-size:12px;color:var(--text-dim);display:flex;gap:12px}.unit-card .uc-best{color:var(--correct)}.unit-card .uc-empty{color:var(--text-dim);font-style:italic}.empty-unit-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px 22px;max-width:360px;text-align:center}.empty-unit-card h3{font-size:15px;margin-bottom:8px;color:var(--text)}.empty-unit-card p{font-size:13px;color:var(--text-dim);line-height:1.55}.empty-unit-card code{font-family:JetBrains Mono,monospace;font-size:11.5px;background:var(--surface2);padding:2px 6px;border-radius:4px;color:var(--text)}.start-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:80dvh;text-align:center;gap:18px;padding:20px}.start-screen .badge{font-family:JetBrains Mono,monospace;font-size:11px;text-transform:uppercase;letter-spacing:2px;color:var(--accent);background:var(--accent-dim);padding:6px 14px;border-radius:20px}.start-screen h1{font-size:28px;font-weight:700;letter-spacing:-.5px;line-height:1.2}.start-screen h1 span{color:var(--accent)}.start-screen .subtitle{color:var(--text-dim);font-size:15px;max-width:340px}.start-screen .ver{font-size:11px;color:var(--text-dim);font-family:JetBrains Mono,monospace}.start-screen .stats{display:flex;gap:24px;margin-top:4px}.start-screen .stat{text-align:center}.start-screen .stat-num{font-size:28px;font-weight:700;color:var(--accent)}.start-screen .stat-label{font-size:11px;color:var(--text-dim);text-transform:uppercase;letter-spacing:1px}.start-screen .start-buttons{display:flex;flex-direction:column;gap:10px;align-items:stretch;width:100%;max-width:280px}.start-screen .back-link{font-size:13px;color:var(--text-dim);margin-top:8px;cursor:pointer}.progress-bar{position:sticky;top:0;z-index:100;background:var(--bg);padding:12px 0 8px}.progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.progress-label{font-family:JetBrains Mono,monospace;font-size:12px;color:var(--text-dim)}.progress-score{font-family:JetBrains Mono,monospace;font-size:12px;color:var(--correct)}.progress-track{height:4px;background:var(--surface2);border-radius:2px;overflow:hidden}.progress-fill{height:100%;background:var(--accent);border-radius:2px;transition:width .4s ease}.question-card{margin-top:16px;animation:fadeUp .3s ease}@keyframes fadeUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.q-source{font-family:JetBrains Mono,monospace;font-size:10px;color:var(--text-dim);text-transform:uppercase;letter-spacing:1.5px;margin-bottom:10px}.q-type-badge{display:inline-block;font-size:10px;font-weight:600;padding:3px 8px;border-radius:6px;margin-bottom:10px;text-transform:uppercase;letter-spacing:.5px}.q-type-badge.scenario{background:#fbbf2426;color:var(--gold)}.q-type-badge.recall{background:var(--accent-dim);color:var(--accent)}.q-type-badge.select-all{background:#a855f726;color:#c084fc}.q-text{font-size:17px;font-weight:600;line-height:1.45;margin-bottom:6px}.q-scenario{background:var(--surface);border-left:3px solid var(--gold);padding:12px 14px;border-radius:0 8px 8px 0;margin-bottom:16px;font-size:14px;color:var(--text-dim);line-height:1.55;white-space:pre-wrap}.select-all-note{font-size:12px;color:#c084fc;margin-bottom:10px;font-weight:600;display:flex;align-items:center;gap:6px}.options{display:flex;flex-direction:column;gap:10px}.option{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;background:var(--surface);border:1.5px solid var(--border);border-radius:12px;cursor:pointer;transition:all .15s;-webkit-user-select:none;user-select:none}.option:active:not(.disabled){transform:scale(.98)}.option.selected{border-color:var(--accent);background:var(--accent-dim)}.option.correct{border-color:var(--correct);background:var(--correct-bg)}.option.wrong{border-color:var(--wrong);background:var(--wrong-bg)}.option.missed{border-color:var(--gold);background:var(--gold-dim)}.option.disabled{pointer-events:none}.option-letter{flex-shrink:0;width:28px;height:28px;display:flex;align-items:center;justify-content:center;border-radius:8px;font-size:13px;font-weight:600;background:var(--surface2);color:var(--text-dim);border:1px solid var(--border)}.option.selected .option-letter{background:var(--accent);color:#0c0f14;border-color:var(--accent)}.option.correct .option-letter{background:var(--correct);color:#0c0f14;border-color:var(--correct)}.option.wrong .option-letter{background:var(--wrong);color:#0c0f14;border-color:var(--wrong)}.option.missed .option-letter{background:var(--gold);color:#0c0f14;border-color:var(--gold)}.option-text{font-size:14px;line-height:1.45;padding-top:3px}.feedback{margin-top:14px;padding:14px 16px;border-radius:10px;font-size:13px;line-height:1.6;animation:fadeUp .25s ease}.feedback.correct-fb{background:var(--correct-bg);border:1px solid var(--correct-border);color:var(--correct)}.feedback.wrong-fb{background:var(--wrong-bg);border:1px solid var(--wrong-border);color:var(--wrong)}.feedback .fb-title{font-weight:700;font-size:14px;margin-bottom:6px}.feedback .fb-example{margin-top:10px;padding:10px 12px;border-radius:8px;background:#ffffff0a;border:1px solid rgba(255,255,255,.06);color:var(--text-dim);font-size:12.5px;line-height:1.55}.feedback .fb-ansnote{margin-top:10px;padding:10px 12px;border-radius:8px;background:#ffffff0a;border:1px solid rgba(255,255,255,.06);color:var(--text);font-size:13px;line-height:1.55}.feedback .fb-example strong{color:var(--text)}.sa-submit{margin-top:12px}.next-area{margin-top:20px;display:flex;justify-content:flex-end}.results{text-align:center;padding:40px 0;animation:fadeUp .4s ease}.results-circle{width:140px;height:140px;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 24px;border:4px solid var(--accent)}.results-pct{font-size:40px;font-weight:700;line-height:1}.results-label{font-size:12px;color:var(--text-dim);margin-top:4px}.results h2{font-size:22px;margin-bottom:8px}.results .results-sub{color:var(--text-dim);font-size:14px;margin-bottom:28px}.results-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.review-section{margin-top:40px;text-align:left}.review-section h3{font-size:16px;margin-bottom:16px;color:var(--text-dim)}.review-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px 16px;margin-bottom:12px}.review-item .ri-q{font-size:14px;font-weight:600;margin-bottom:8px}.review-item .ri-your{font-size:13px;color:var(--wrong);margin-bottom:4px}.review-item .ri-correct{font-size:13px;color:var(--correct);margin-bottom:4px}.review-item .ri-example{font-size:12px;color:var(--text-dim);line-height:1.5;margin-top:6px;padding:8px 10px;background:#ffffff08;border-radius:6px}.review-item .ri-source{font-family:JetBrains Mono,monospace;font-size:10px;color:var(--text-dim);margin-top:8px;text-transform:uppercase;letter-spacing:1px}.empty-state{text-align:center;padding:60px 20px;color:var(--text-dim)}.empty-state h2{color:var(--text);font-size:18px;margin-bottom:8px}