: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(3,1fr);min-width:480px;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:clamp(1.25rem,2vw,1.8rem);line-height:1.35}.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}.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{justify-content:space-between;align-items:center;gap:12px;margin-top:18px;display:flex}.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}.spin{animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width<=860px){.header,.quiz-top,.actions{flex-direction:column;align-items:stretch}.stats-grid,.review-grid,.form-grid{grid-template-columns:1fr}.tabs{min-width:unset;grid-template-columns:repeat(3,1fr);width:100%}.right-actions{flex-direction:column}.quiz-top select{min-width:unset}}