:root{--bg-primary: #0f1117;--bg-card: #1a1d27;--bg-hover: #22263a;--border: #2d3148;--accent: #6c63ff;--accent-hover: #5a52e0;--correct: #22c55e;--correct-bg: #0f2d1e;--wrong: #ef4444;--wrong-bg: #2d1010;--warning: #f59e0b;--text: #e2e8f0;--text-muted: #8892a4;--text-dim: #4a5568;--radius: 12px;--radius-sm: 8px}[data-theme=light]{--bg-primary: #f0f2f8;--bg-card: #ffffff;--bg-hover: #e8ebf5;--border: #d1d8e8;--accent: #6c63ff;--accent-hover: #5a52e0;--correct: #16a34a;--correct-bg: #f0fdf4;--wrong: #dc2626;--wrong-bg: #fef2f2;--warning: #d97706;--text: #1a1f36;--text-muted: #5a6380;--text-dim: #9aa3bf;--radius: 12px;--radius-sm: 8px}[data-theme=light] .bank-item-num{background:#6c63ff1f}[data-theme=light] .grid-btn.answered{background:#0000000a}[data-theme=light] .mode-card:hover{box-shadow:0 8px 24px #6c63ff1f}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,Segoe UI,system-ui,sans-serif;background:var(--bg-primary);color:var(--text);min-height:100vh;line-height:1.6;font-size:15px}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;outline:none;font-family:inherit;font-size:14px}.container{max-width:860px;margin:0 auto;padding:0 20px}.navbar{background:var(--bg-card);border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:0;z-index:100}.navbar-inner{display:flex;align-items:center;justify-content:space-between}.navbar-brand{font-weight:700;font-size:17px;color:var(--accent);letter-spacing:-.3px}.navbar-brand span{color:var(--text-muted);font-weight:400}.navbar-back{display:flex;align-items:center;gap:6px;color:var(--text-muted);font-size:13px;padding:6px 12px;border-radius:var(--radius-sm);background:transparent;border:1px solid var(--border);transition:all .15s;cursor:pointer}.navbar-back:hover{background:var(--bg-hover);color:var(--text)}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px}.home{padding:48px 0}.home-hero{text-align:center;margin-bottom:48px}.home-hero h1{font-size:32px;font-weight:800;letter-spacing:-.5px;margin-bottom:8px}.home-hero h1 span{color:var(--accent)}.home-hero p{color:var(--text-muted);font-size:15px}.exam-select{margin-bottom:32px}.exam-select h2{font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.8px;color:var(--text-muted);margin-bottom:12px}.exam-chips{display:flex;gap:8px;flex-wrap:wrap}.chip{padding:8px 18px;border-radius:999px;font-size:13px;font-weight:600;background:var(--bg-hover);border:1px solid var(--border);color:var(--text-muted);transition:all .15s;cursor:pointer}.chip:hover{border-color:var(--accent);color:var(--text)}.chip.active{background:var(--accent);border-color:var(--accent);color:#fff}.mode-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:32px}.mode-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;text-align:left;cursor:pointer;transition:all .2s;width:100%}.mode-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 8px 24px #6c63ff26}.mode-card-icon{font-size:28px;margin-bottom:12px}.mode-card h3{font-size:16px;font-weight:700;margin-bottom:6px;color:var(--accent)}.mode-card p{font-size:13px;color:var(--text-muted);line-height:1.5}.mode-card .q-count{display:inline-block;margin-top:12px;font-size:12px;font-weight:600;color:var(--accent);background:#6c63ff1f;padding:3px 10px;border-radius:999px}.progress-bar{height:4px;background:var(--border);border-radius:999px;overflow:hidden;margin-bottom:24px}.progress-fill{height:100%;background:var(--accent);border-radius:999px;transition:width .3s ease}.q-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:8px}.q-meta{display:flex;gap:8px;flex-wrap:wrap}.badge{font-size:11px;font-weight:600;padding:3px 8px;border-radius:999px;background:#6c63ff1f;color:var(--accent);letter-spacing:.3px}.badge.k1{background:#22c55e1a;color:var(--correct)}.badge.k2{background:#f59e0b1a;color:var(--warning)}.badge.k3{background:#ef44441a;color:var(--wrong)}.q-progress-text{font-size:13px;color:var(--text-muted);white-space:nowrap}.q-text{font-size:15px;line-height:1.65;margin-bottom:20px;color:var(--text)}.options-list{display:flex;flex-direction:column;gap:8px}.option-btn{display:flex;align-items:flex-start;gap:12px;padding:13px 16px;border-radius:var(--radius-sm);background:var(--bg-hover);border:1px solid var(--border);color:var(--text);font-size:14px;line-height:1.5;text-align:left;transition:all .15s;width:100%}.option-btn:hover:not(:disabled){border-color:var(--accent);background:#6c63ff14}.option-btn:disabled{cursor:default}.option-btn.selected{border-color:var(--accent);background:#6c63ff1f}.option-btn.correct{border-color:var(--correct);background:var(--correct-bg)}.option-btn.wrong{border-color:var(--wrong);background:var(--wrong-bg)}.option-letter{display:flex;align-items:center;justify-content:center;min-width:26px;height:26px;border-radius:6px;background:var(--bg-card);border:1px solid var(--border);font-size:12px;font-weight:700;text-transform:uppercase;flex-shrink:0}.option-btn.correct .option-letter{background:var(--correct);border-color:var(--correct);color:#fff}.option-btn.wrong .option-letter{background:var(--wrong);border-color:var(--wrong);color:#fff}.option-btn.selected .option-letter{background:var(--accent);border-color:var(--accent);color:#fff}.q-nav{display:flex;justify-content:space-between;align-items:center;margin-top:20px;gap:12px}.btn{padding:10px 22px;border-radius:var(--radius-sm);font-size:14px;font-weight:600;transition:all .15s}.btn-primary{background:var(--accent);color:#fff;border:1px solid transparent}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:transparent;color:var(--text-muted);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-hover);color:var(--text)}.btn-danger{background:var(--wrong-bg);color:var(--wrong);border:1px solid var(--wrong)}.btn-danger:hover{background:var(--wrong);color:#fff}.btn:disabled{opacity:.4;cursor:not-allowed}.timer{font-size:20px;font-weight:700;font-variant-numeric:tabular-nums;color:var(--text);letter-spacing:1px}.timer.warning{color:var(--warning)}.timer.danger{color:var(--wrong);animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.exam-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:4px;margin-top:16px}.grid-btn{aspect-ratio:1;border-radius:6px;font-size:11px;font-weight:600;border:1px solid var(--border);background:var(--bg-hover);color:var(--text-muted);transition:all .1s;cursor:pointer}.grid-btn:hover{border-color:var(--accent);color:var(--text)}.grid-btn.current{border-color:var(--accent);background:var(--accent);color:#fff}.grid-btn.answered{border-color:var(--text-dim);background:#ffffff0d;color:var(--text)}.result{padding:48px 0}.result-hero{text-align:center;margin-bottom:32px}.result-score{font-size:72px;font-weight:800;line-height:1;margin-bottom:8px}.result-score.pass{color:var(--correct)}.result-score.fail{color:var(--wrong)}.result-label{font-size:15px;color:var(--text-muted)}.result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:32px}.stat-box{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;text-align:center}.stat-box .stat-value{font-size:28px;font-weight:800;margin-bottom:4px}.stat-box .stat-label{font-size:12px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px}.stat-box.correct .stat-value{color:var(--correct)}.stat-box.wrong .stat-value{color:var(--wrong)}.result-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:40px}.feedback-box{margin-top:12px;padding:12px 16px;border-radius:var(--radius-sm);font-size:14px;line-height:1.5}.feedback-box.correct{background:var(--correct-bg);border:1px solid var(--correct);color:var(--correct)}.feedback-box.wrong{background:var(--wrong-bg);border:1px solid var(--wrong);color:var(--text)}.bank-filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}.filter-select{background:var(--bg-card);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);padding:8px 12px;font-size:13px;outline:none;cursor:pointer;transition:border-color .15s}.filter-select:focus{border-color:var(--accent)}.bank-list{display:flex;flex-direction:column;gap:8px}.bank-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}.bank-item-header{display:flex;align-items:center;gap:12px;padding:14px 16px;cursor:pointer;transition:background .15s;width:100%;text-align:left;background:none;color:var(--text)}.bank-item-header:hover{background:var(--bg-hover)}.bank-item-num{min-width:28px;height:28px;border-radius:6px;background:#6c63ff26;color:var(--accent);font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}.bank-item-text{flex:1;font-size:14px;color:var(--text);line-height:1.4}.bank-item-chevron{color:var(--text-dim);font-size:12px;transition:transform .2s;flex-shrink:0}.bank-item.open .bank-item-chevron{transform:rotate(90deg)}.bank-item-body{padding:0 16px 16px 56px;border-top:1px solid var(--border)}.bank-option{display:flex;gap:10px;padding:8px 10px;border-radius:6px;margin-top:6px;font-size:13px;line-height:1.4;border:1px solid transparent;color:var(--text-muted)}.bank-option.correct-ans{background:var(--correct-bg);border-color:var(--correct);color:var(--text)}.bank-option .opt-letter{font-weight:700;text-transform:uppercase;min-width:16px}.bank-option.correct-ans .opt-letter{color:var(--correct)}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.page{padding:32px 0 64px}.section-title{font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.8px;color:var(--text-muted);margin-bottom:16px}.divider{height:1px;background:var(--border);margin:24px 0}.text-center{text-align:center}.mt-4{margin-top:16px}.mt-8{margin-top:32px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:28px}.history-item{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm)}.score-chip{padding:4px 12px;border-radius:999px;font-size:13px;font-weight:700;flex-shrink:0}.score-chip.pass{background:var(--correct-bg);color:var(--correct)}.score-chip.fail{background:var(--wrong-bg);color:var(--wrong)}.login-overlay{min-height:100dvh;display:flex;align-items:center;justify-content:center;background:var(--bg-primary);padding:24px}.login-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:40px 36px;width:100%;max-width:360px;text-align:center}.login-logo{display:inline-block;font-size:13px;font-weight:800;letter-spacing:3px;color:#fff;background:var(--accent);border-radius:8px;padding:6px 14px;margin-bottom:20px}.login-title{font-size:22px;font-weight:700;color:var(--text);margin-bottom:8px}.login-subtitle{font-size:13px;color:var(--text-muted);margin-bottom:28px}.login-input{width:100%;padding:12px 16px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-hover);color:var(--text);font-size:20px;letter-spacing:6px;text-align:center;outline:none;transition:border-color .15s;box-sizing:border-box;margin-bottom:8px}.login-input:focus{border-color:var(--accent)}.login-input.input-error{border-color:var(--wrong)}.login-error{font-size:13px;color:var(--wrong);margin-bottom:8px}.login-btn{width:100%;padding:12px;border-radius:var(--radius-sm);background:var(--accent);color:#fff;font-size:15px;font-weight:600;border:none;cursor:pointer;margin-top:8px;transition:background .15s}.login-btn:hover{background:var(--accent-hover)}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-6px)}80%{transform:translate(6px)}}.login-card.shake{animation:shake .45s ease}