:root{--bg:#f8fafc;--bg-card:#fffffff0;--bg-input:#fff;--bg-secondary:#f1f5f9;--bg-tabs:#e2e8f0;--bg-tab-active:#fff;--bg-answer:#fff;--bg-note:#f8fafc;--text:#0f172a;--text-muted:#64748b;--text-tabs:#475569;--border:#e2e8f0;--border-input:#cbd5e1;--shadow-card:#0f172a0f;--shadow-answer:#0f172a12;--shadow-tab:#0f172a14;--badge-bg:#f1f5f9;--badge-color:#334155;--badge-border:#e2e8f0;color:var(--text);background:var(--bg);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}.dark{--bg:#0f172a;--bg-card:#1e293bf7;--bg-input:#1e293b;--bg-secondary:#1e293b;--bg-tabs:#1e293b;--bg-tab-active:#334155;--bg-answer:#1e293b;--bg-note:#0f172a;--text:#f1f5f9;--text-muted:#94a3b8;--text-tabs:#94a3b8;--border:#334155;--border-input:#475569;--shadow-card:#0000004d;--shadow-answer:#0003;--shadow-tab:#00000040;--badge-bg:#334155;--badge-color:#cbd5e1;--badge-border:#475569;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0}button,select,textarea,input{font:inherit}.app-shell{background:radial-gradient(circle at top left, #3b82f61a, transparent 30%), radial-gradient(circle at top right, #f973161a, transparent 30%), var(--bg);min-height:100vh;padding:24px}.container{max-width:1180px;margin:0 auto}.header{justify-content:space-between;align-items:center;gap:24px;margin-bottom:24px;display:flex}h1{letter-spacing:-.04em;margin:0;font-size:clamp(2rem,4vw,3rem);line-height:1}.header p,.muted{color:var(--text-muted);margin:10px 0 0;font-size:1.02rem}code{background:var(--bg-secondary);border-radius:8px;padding:2px 6px}.card{background:var(--bg-card);border:1px solid var(--border);box-shadow:0 10px 28px var(--shadow-card);border-radius:24px;padding:22px}.stats-grid{grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:18px;display:grid}.stat-card{padding:20px}.stat-title{color:var(--text-muted);align-items:center;gap:8px;display:flex}.stat-value{margin-top:10px;font-size:2rem;font-weight:800}.stat-subtitle{color:var(--text-muted);margin-top:4px;font-size:.9rem}.tabs{background:var(--bg-tabs);border-radius:18px;grid-template-columns:repeat(5,1fr);min-width:540px;margin:10px 0 18px;padding:4px;display:inline-grid}.tabs button{cursor:pointer;color:var(--text-tabs);background:0 0;border:0;border-radius:14px;padding:10px 18px;font-weight:700}.tabs button.active{background:var(--bg-tab-active);color:var(--text);box-shadow:0 3px 10px var(--shadow-tab)}.quiz-top{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:20px;display:flex}.badges{flex-wrap:wrap;gap:8px;display:flex}.badge{background:var(--badge-bg);border:1px solid var(--badge-border);color:var(--badge-color);border-radius:999px;align-items:center;padding:7px 10px;font-size:.82rem;font-weight:800;display:inline-flex}.badge.orange{color:#7c2d12;background:#ffedd5;border-color:#fed7aa}.badge.blue{color:#1e3a8a;background:#dbeafe;border-color:#bfdbfe}.badge.green{color:#fff;background:#16a34a;border-color:#16a34a}.badge.red{color:#fff;background:#dc2626;border-color:#dc2626}.dark .badge.orange{color:#fdba74;background:#431407;border-color:#7c2d12}.dark .badge.blue{color:#93c5fd;background:#172554;border-color:#1e3a8a}select,input{border:1px solid var(--border-input);background:var(--bg-input);color:var(--text);border-radius:16px;width:100%;padding:10px 12px}.quiz-top select{min-width:260px}.question-index{color:var(--text-muted);margin-bottom:10px}.quiz-card h2{margin:0 0 20px;font-size:1.05rem;font-weight:600;line-height:1.45}.answers{gap:12px;display:grid}.answer{text-align:left;border:1px solid var(--border);background:var(--bg-answer);width:100%;color:var(--text);cursor:pointer;border-radius:18px;grid-template-columns:auto 1fr auto;align-items:flex-start;gap:12px;padding:16px;transition:all .15s;display:grid}.answer:hover{box-shadow:0 8px 18px var(--shadow-answer);transform:translateY(-1px)}.answer.selected{border-color:var(--text)}.answer.correct{color:#14532d;background:#f0fdf4;border-color:#22c55e}.answer.wrong{color:#7f1d1d;background:#fef2f2;border-color:#ef4444}.dark .answer.correct{color:#bbf7d0;background:#14532d}.dark .answer.wrong{color:#fecaca;background:#7f1d1d}.checkbox{border:1px solid var(--border-input);border-radius:6px;justify-content:center;align-items:center;width:22px;height:22px;margin-top:1px;font-weight:900;display:inline-flex}.checkbox.radio{border-radius:50%}.selection-info{color:#475569;background:#f1f5f9;border:1px solid #e2e8f0;border-radius:12px;align-items:center;gap:6px;margin-bottom:16px;padding:8px 14px;font-size:.9rem;font-weight:600;display:flex}.selection-info .selection-count{color:#0f172a;font-weight:900}.selection-info.complete{color:#166534;background:#f0fdf4;border-color:#bbf7d0}.selection-info.complete .selection-count,.status-icon.ok{color:#16a34a}.status-icon.ko{color:#dc2626}.feedback{border:1px solid;border-radius:20px;margin-top:18px;padding:18px}.feedback.good{color:#14532d;background:#f0fdf4;border-color:#bbf7d0}.feedback.bad{color:#7f1d1d;background:#fef2f2;border-color:#fecaca}.dark .feedback.good{color:#bbf7d0;background:#14532d;border-color:#166534}.dark .feedback.bad{color:#fecaca;background:#7f1d1d;border-color:#991b1b}.feedback-title{align-items:center;gap:8px;font-size:1.15rem;font-weight:900;display:flex}.tip,.exam-rule{background:var(--bg-secondary);border:1px solid var(--border);border-radius:16px;gap:10px;margin-top:12px;padding:12px;display:flex}.whywrong{background:var(--bg-secondary);border:1px solid var(--border);border-radius:16px;margin-top:12px;padding:12px}.whywrong ul{margin:8px 0 0;padding-left:20px}.keywords{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.notes{gap:8px;margin-top:18px;display:grid}.notes label,.form-grid label{color:var(--text-muted);gap:8px;font-weight:800;display:grid}textarea{border:1px solid var(--border-input);background:var(--bg-input);color:var(--text);resize:vertical;border-radius:18px;min-height:90px;padding:12px}.actions{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-top:18px;display:flex}.cost-hint{color:#94a3b8;margin:0;font-size:.8rem}.right-actions{gap:12px;display:flex}.btn{cursor:pointer;border:1px solid #0000;border-radius:16px;justify-content:center;align-items:center;gap:8px;padding:11px 16px;font-weight:900;display:inline-flex}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{color:#fff;background:#0f172a}.dark .btn-primary{color:#0f172a;background:#f1f5f9}.btn-secondary{background:var(--bg-tabs);color:var(--text)}.btn-outline{background:var(--bg-input);border-color:var(--border-input);color:var(--text)}.section-title{align-items:center;gap:10px;display:flex}.review-grid{grid-template-columns:repeat(2,1fr);gap:16px;display:grid}.review-card{border:1px solid var(--border);background:var(--bg-input);border-radius:18px;padding:16px}.review-head{justify-content:space-between;gap:12px;display:flex}.review-head div div{color:var(--text-muted);margin-top:4px;font-size:.9rem}.note-box{background:var(--bg-note);border:1px solid var(--border);border-radius:14px;padding:10px}.exam-rule{background:#fffbeb;border-color:#fde68a}.dark .exam-rule{color:#fef3c7;background:#422006;border-color:#854d0e}.form-grid{grid-template-columns:2fr 1fr 1fr;gap:16px;margin-top:20px;display:grid}.form-grid .wide{grid-column:1/-1}.guide-content h3{margin:1.2rem 0 .4rem;font-size:1rem}.guide-content p,.guide-content li{color:var(--text-muted);line-height:1.5}.guide-content ul{margin:.4rem 0;padding-left:1.2rem}.guide-content li{margin-bottom:.4rem}.spin{animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width<=860px){.app-shell{padding:12px}.header,.quiz-top,.actions{flex-direction:column;align-items:stretch}.stats-grid{grid-template-columns:repeat(2,1fr);gap:8px;margin-bottom:12px}.stat-card{padding:12px}.stat-value{margin-top:6px;font-size:1.4rem}.review-grid,.form-grid{grid-template-columns:1fr}.tabs{min-width:unset;grid-template-columns:repeat(5,1fr);width:100%}.tabs button{padding:8px 6px;font-size:.8rem}.right-actions{flex-direction:column}.quiz-top select{min-width:unset}.card{border-radius:16px;padding:14px}.answer{border-radius:14px;gap:8px;padding:12px}.badge{padding:4px 8px;font-size:.75rem}.badges{gap:4px}h1{font-size:1.4rem}.feedback{border-radius:14px;padding:12px}.tip{padding:10px}.notes textarea{min-height:60px}}.test-options h3{margin:1rem 0 .5rem;font-size:.95rem}.test-buttons{flex-wrap:wrap;gap:10px;display:flex}.test-buttons .btn-outline{border:1.5px solid var(--accent);color:var(--accent);cursor:pointer;background:0 0;border-radius:8px;padding:10px 18px;font-weight:600}.test-buttons .btn-outline:hover{background:var(--accent);color:#fff}.test-timer{z-index:100;background:var(--accent);color:#fff;border-radius:8px;justify-content:space-between;align-items:center;margin-bottom:12px;padding:8px 16px;font-size:.9rem;font-weight:600;display:flex;position:sticky;top:0}.test-timer.urgent{background:#dc2626;animation:1s infinite pulse}.test-timer .btn-sm{color:#fff;cursor:pointer;background:#fff3;border:none;border-radius:4px;padding:4px 10px;font-size:.8rem}.test-timer .insufficient-warning{opacity:.9;font-size:.8rem;font-weight:400}.test-results{text-align:center;padding:2rem 0}.test-score{color:var(--accent);font-size:4rem;font-weight:800}@keyframes pulse{0%,to{opacity:1}50%{opacity:.85}}.exam-live{background:var(--bg-card);border:1px solid var(--border);box-shadow:0 10px 28px var(--shadow-card);border-radius:24px;overflow:hidden}.exam-header{border-bottom:1px solid var(--border);background:var(--bg-secondary);justify-content:space-between;align-items:center;gap:16px;padding:16px 22px;display:flex}.exam-header h2{align-items:center;gap:8px;margin:0;font-size:1rem;font-weight:800;display:flex}.exam-header-left{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.exam-header-right{align-items:center;gap:14px;display:flex}.exam-clock{font-variant-numeric:tabular-nums;color:#f1f5f9;background:#0f172a;border-radius:10px;padding:6px 14px;font-size:1.2rem;font-weight:900}.dark .exam-clock{color:#0f172a;background:#f1f5f9}.exam-clock.urgent{color:#fff;background:#dc2626;animation:1s infinite pulse}.exam-progress{color:var(--text-muted);font-size:.85rem;font-weight:600}.exam-body{grid-template-columns:1fr 220px;min-height:500px;display:grid}.exam-question-panel{border-right:1px solid var(--border);padding:24px}.exam-question-header{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.exam-question-number{color:var(--text-muted);font-size:.9rem;font-weight:700}.btn-flag{border:1px solid var(--border-input);background:var(--bg-input);color:var(--text-muted);cursor:pointer;border-radius:8px;padding:6px 12px;font-size:.82rem;font-weight:600;transition:all .15s}.btn-flag:hover{background:#fef3c7;border-color:#f59e0b}.btn-flag.flagged{color:#92400e;background:#fef3c7;border-color:#f59e0b}.dark .btn-flag.flagged{color:#fbbf24;background:#422006;border-color:#d97706}.exam-multi-hint{color:#2563eb;background:#eff6ff;border-radius:8px;margin-bottom:8px;padding:6px 12px;font-size:.85rem;font-weight:700;display:inline-block}.dark .exam-multi-hint{color:#93c5fd;background:#172554}.exam-question-text{margin:0 0 20px;font-size:1.05rem;font-weight:500;line-height:1.55}.exam-options{gap:10px;display:grid}.exam-option{text-align:left;border:1.5px solid var(--border);background:var(--bg-answer);width:100%;color:var(--text);cursor:pointer;border-radius:14px;grid-template-columns:auto 1fr;align-items:flex-start;gap:12px;padding:14px 16px;font-size:.95rem;line-height:1.45;transition:all .12s;display:grid}.exam-option:hover{box-shadow:0 4px 12px var(--shadow-answer);border-color:#94a3b8}.exam-option.selected{background:#eff6ff;border-color:#2563eb}.dark .exam-option.selected{background:#172554;border-color:#3b82f6}.exam-option-marker{border:2px solid var(--border-input);border-radius:4px;flex-shrink:0;justify-content:center;align-items:center;width:20px;height:20px;margin-top:2px;font-size:.75rem;font-weight:900;display:inline-flex}.exam-option-marker.radio{border-radius:50%}.exam-option.selected .exam-option-marker{color:#fff;background:#2563eb;border-color:#2563eb}.dark .exam-option.selected .exam-option-marker{background:#3b82f6;border-color:#3b82f6}.exam-nav-buttons{border-top:1px solid var(--border);justify-content:space-between;margin-top:24px;padding-top:18px;display:flex}.btn-submit-exam{font-size:.95rem;color:#fff!important;background:#16a34a!important}.btn-submit-exam:hover{background:#15803d!important}.exam-navigator{background:var(--bg-secondary);flex-direction:column;gap:14px;padding:18px 14px;display:flex}.exam-navigator h4{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin:0;font-size:.85rem;font-weight:800}.exam-nav-grid{grid-template-columns:repeat(5,1fr);gap:6px;display:grid}.exam-nav-item{aspect-ratio:1;border:1.5px solid var(--border);background:var(--bg-answer);width:100%;color:var(--text-muted);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;font-size:.75rem;font-weight:700;transition:all .12s;display:flex;position:relative}.exam-nav-item:hover{border-color:#94a3b8}.exam-nav-item.current{color:#2563eb;background:#eff6ff;border-color:#2563eb;font-weight:900}.dark .exam-nav-item.current{color:#93c5fd;background:#172554;border-color:#3b82f6}.exam-nav-item.answered{color:#166534;background:#f0fdf4;border-color:#86efac}.dark .exam-nav-item.answered{color:#86efac;background:#14532d;border-color:#166534}.exam-nav-item.flagged{border-color:#f59e0b}.exam-nav-item .flag-dot{font-size:.55rem;position:absolute;top:-4px;right:-4px}.exam-nav-legend{color:var(--text-muted);flex-direction:column;gap:6px;margin-top:auto;font-size:.75rem;display:flex}.exam-nav-legend span{align-items:center;gap:6px;display:flex}.legend-dot{border:1.5px solid var(--border);border-radius:4px;width:12px;height:12px}.legend-dot.answered{background:#f0fdf4;border-color:#86efac}.legend-dot.current{background:#eff6ff;border-color:#2563eb}.exam-nav-actions{border-top:1px solid var(--border);padding-top:10px}.exam-nav-actions .btn-submit-exam{width:100%}.exam-results{background:var(--bg-card);border:1px solid var(--border);box-shadow:0 10px 28px var(--shadow-card);border-radius:24px;padding:28px}.exam-results-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.exam-score-badge{letter-spacing:.05em;border-radius:10px;padding:8px 20px;font-size:1.1rem;font-weight:900}.exam-score-badge.pass{color:#166534;background:#dcfce7;border:2px solid #86efac}.exam-score-badge.fail{color:#991b1b;background:#fef2f2;border:2px solid #fecaca}.dark .exam-score-badge.pass{color:#86efac;background:#14532d;border-color:#166534}.dark .exam-score-badge.fail{color:#fecaca;background:#7f1d1d;border-color:#991b1b}.exam-score-display{text-align:center;border-bottom:1px solid var(--border);margin-bottom:24px;padding:20px 0 28px}.exam-score-number{margin-bottom:8px;font-size:4rem;font-weight:900;line-height:1}.exam-score-display p{margin:6px 0 0}.exam-results-review h3{margin:0 0 16px;font-size:1rem}.exam-review-item{border:1px solid var(--border);background:var(--bg-input);border-radius:16px;margin-bottom:12px;padding:16px}.exam-review-item.correct{border-left:4px solid #22c55e}.exam-review-item.incorrect{border-left:4px solid #ef4444}.exam-review-head{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:8px;display:flex}.exam-review-number{font-size:.9rem;font-weight:800}.exam-review-question{color:var(--text);margin:8px 0 12px;font-size:.92rem;line-height:1.5}.exam-review-answers{gap:4px;font-size:.88rem;display:grid}.exam-review-option{border-radius:6px;padding:6px 10px;line-height:1.4}.exam-review-option.correct{color:#166534;background:#f0fdf4;font-weight:600}.exam-review-option.wrong{color:#991b1b;background:#fef2f2;font-weight:600}.dark .exam-review-option.correct{color:#86efac;background:#14532d}.dark .exam-review-option.wrong{color:#fecaca;background:#7f1d1d}.exam-review-explanation{background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;margin-top:10px;padding:12px;font-size:.88rem;line-height:1.5}.exam-review-explanation p{margin:0 0 6px}.exam-review-tip{color:#d97706;align-items:center;gap:6px;display:flex}.dark .exam-review-tip{color:#fbbf24}.exam-results-actions{border-top:1px solid var(--border);justify-content:center;margin-top:24px;padding-top:20px;display:flex}.insufficient-warning{color:#d97706;font-size:.8rem;font-weight:500}.btn-sm{padding:6px 12px;font-size:.82rem}@media (width<=860px){.exam-body{grid-template-columns:1fr}.exam-question-panel{border-right:none;border-bottom:1px solid var(--border);padding:16px}.exam-navigator{padding:14px}.exam-nav-grid{grid-template-columns:repeat(10,1fr)}.exam-header{flex-direction:column;align-items:flex-start;gap:10px}.exam-header-right{justify-content:space-between;width:100%}.exam-results{padding:16px}.exam-score-number{font-size:3rem}.exam-review-head{flex-direction:column;align-items:flex-start}}