:root{--qf-primary:#7c5cfc;--qf-primary-d:#6448e0;--qf-accent:#fc5c7d;--qf-success:#22c55e;--qf-error:#ef4444;--qf-warning:#f59e0b;--qf-gold:#fbbf24;--qf-silver:#9ca3af;--qf-bronze:#b45309;--qf-bg:#f5f4ff;--qf-card:#ffffff;--qf-border:#e5e0ff;--qf-text:#1e1740;--qf-muted:#7c7a9e;--qf-radius:14px;--qf-radius-sm:9px;--qf-shadow:0 4px 24px rgba(124,92,252,.10);--qf-shadow-lg:0 8px 40px rgba(124,92,252,.18)}.qf-wrap,.qf-wrap *{box-sizing:border-box}.qf-wrap{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:var(--qf-text)}.qf-screen{display:none}.qf-screen.qf-active{display:block;animation:qfFadeUp .35s ease}@keyframes qfFadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}.qf-start-card{background:var(--qf-card);border:1px solid var(--qf-border);border-radius:var(--qf-radius);padding:40px 32px;text-align:center;box-shadow:var(--qf-shadow);max-width:520px;margin:0 auto}.qf-quiz-icon{font-size:52px;margin-bottom:12px}.qf-start-card h2{font-size:26px;font-weight:700;margin:0 0 10px}.qf-desc{color:var(--qf-muted);font-size:15px;margin-bottom:24px;line-height:1.6}.qf-meta-chips,.qf-card-meta{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:28px}.qf-chip{display:inline-flex;align-items:center;gap:4px;padding:4px 12px;border-radius:20px;font-size:12px;font-weight:500;background:var(--qf-bg);border:1px solid var(--qf-border);color:var(--qf-muted)}.qf-diff-easy{background:#f0fdf4;color:#15803d;border-color:#bbf7d0}.qf-diff-medium{background:#fffbeb;color:#b45309;border-color:#fde68a}.qf-diff-hard{background:#fef2f2;color:#dc2626;border-color:#fca5a5}.qf-btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:11px 24px;border-radius:30px;font-size:14px;font-weight:600;cursor:pointer;border:2px solid #fff0;text-decoration:none;transition:all .2s;line-height:1}.qf-btn-primary{background:var(--qf-primary);color:#fff;border-color:var(--qf-primary);box-shadow:0 4px 16px rgb(124 92 252 / .3)}.qf-btn-primary:hover{background:var(--qf-primary-d);transform:translateY(-2px);box-shadow:0 8px 24px rgb(124 92 252 / .4);color:#fff;text-decoration:none}.qf-btn-outline{background:#fff0;color:var(--qf-primary);border-color:var(--qf-border)}.qf-btn-outline:hover{background:var(--qf-bg)}.qf-btn-outline:disabled{opacity:.4;cursor:not-allowed;transform:none!important}.qf-btn-danger-outline{background:#fff0;color:var(--qf-error);border-color:#fca5a5;font-size:13px;padding:9px 18px}.qf-btn-danger-outline:hover{background:#fef2f2}.qf-start-quiz,.qf-start-btn{padding:14px 36px;font-size:16px}.qf-quiz-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:12px}.qf-quiz-title{font-size:18px;font-weight:700}.qf-timer{display:flex;align-items:center;gap:6px;padding:8px 18px;border-radius:30px;background:var(--qf-card);border:2px solid var(--qf-border);font-size:20px;font-weight:700;font-variant-numeric:tabular-nums;transition:all .3s}.qf-timer-icon{font-size:16px}.qf-timer.qf-warn{border-color:#fbbf24;color:#b45309;background:#fffbeb}.qf-timer.qf-danger{border-color:var(--qf-error);color:var(--qf-error);background:#fef2f2;animation:qfPulse 1s infinite}@keyframes qfPulse{50%{transform:scale(1.04)}}.qf-progress-section{margin-bottom:24px}.qf-progress-info{display:flex;justify-content:space-between;font-size:13px;color:var(--qf-muted);margin-bottom:8px}.qf-progress-bar-wrap{height:8px;background:var(--qf-bg);border-radius:4px;overflow:hidden;margin-bottom:12px}.qf-progress-bar{height:100%;background:linear-gradient(90deg,var(--qf-primary),var(--qf-accent));border-radius:4px;transition:width .4s ease}.qf-q-dots{display:flex;flex-wrap:wrap;gap:6px}.qf-dot{width:30px;height:30px;border-radius:50%;border:2px solid var(--qf-border);background:var(--qf-card);font-size:11px;font-weight:600;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--qf-muted);transition:all .2s}.qf-dot:hover{border-color:var(--qf-primary);background:var(--qf-bg)}.qf-dot-answered{background:rgb(124 92 252 / .12);border-color:var(--qf-primary);color:var(--qf-primary)}.qf-dot-current{background:var(--qf-primary);border-color:var(--qf-primary);color:#fff}.qf-question{display:none;background:var(--qf-card);border:1px solid var(--qf-border);border-radius:var(--qf-radius);padding:28px;box-shadow:var(--qf-shadow)}.qf-question.qf-active{display:block;animation:qfFadeUp .25s ease}.qf-q-label{font-size:12px;color:var(--qf-muted);text-transform:uppercase;letter-spacing:.8px;margin-bottom:10px}.qf-q-text{font-size:19px;font-weight:600;line-height:1.45;margin-bottom:24px}.qf-options{display:grid;gap:12px}.qf-option{display:flex;align-items:center;gap:14px;padding:14px 18px;border-radius:var(--qf-radius-sm);border:2px solid var(--qf-border);background:var(--qf-bg);cursor:pointer;transition:all .18s;position:relative}.qf-option:hover:not(.qf-selected){border-color:rgb(124 92 252 / .5);background:#f0ecff}.qf-option.qf-selected{border-color:var(--qf-primary);background:rgb(124 92 252 / .08)}.qf-opt-letter{width:34px;height:34px;border-radius:50%;background:var(--qf-card);border:1px solid var(--qf-border);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex-shrink:0;transition:all .18s}.qf-option.qf-selected .qf-opt-letter{background:var(--qf-primary);border-color:var(--qf-primary);color:#fff}.qf-opt-text{flex:1;font-size:15px;line-height:1.4}.qf-opt-check{opacity:0;color:var(--qf-primary);font-weight:700;transition:opacity .2s}.qf-option.qf-selected .qf-opt-check{opacity:1}.qf-nav{display:flex;align-items:center;justify-content:space-between;margin-top:20px;flex-wrap:wrap;gap:10px}.qf-gate{position:fixed;inset:0;background:rgb(0 0 0 / .5);z-index:9999;display:flex;align-items:center;justify-content:center;padding:20px}.qf-gate-inner{background:var(--qf-card);border-radius:var(--qf-radius);padding:36px 32px;max-width:440px;width:100%;text-align:center;box-shadow:var(--qf-shadow-lg)}.qf-gate-title{font-size:22px;font-weight:700;margin:10px 0 8px}.qf-gate-desc{color:var(--qf-muted);margin-bottom:20px}.qf-gate-meta{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-bottom:20px}.qf-field{margin-bottom:14px;text-align:left}.qf-field label{display:block;font-size:13px;font-weight:500;margin-bottom:5px}.qf-field input{width:100%;padding:10px 14px;border:1px solid var(--qf-border);border-radius:var(--qf-radius-sm);font-size:14px}.qf-results-wrap{max-width:620px;margin:0 auto}.qf-results-hero{text-align:center;padding:36px 0 28px}.qf-score-ring{width:150px;height:150px;margin:0 auto 20px;position:relative}.qf-score-ring svg{width:100%;height:100%;transform:rotate(-90deg)}.qf-score-ring circle{fill:none;stroke-width:10}.qf-ring-track{stroke:#ede9ff}.qf-ring-fill{stroke:var(--qf-primary);stroke-linecap:round;transition:stroke-dashoffset 1.2s cubic-bezier(.4,0,.2,1)}.qf-result-pass .qf-ring-fill{stroke:var(--qf-success)}.qf-result-fail .qf-ring-fill{stroke:var(--qf-error)}.qf-score-center{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}.qf-score-pct{font-size:30px;font-weight:800;line-height:1}.qf-score-lbl{font-size:11px;color:var(--qf-muted)}.qf-result-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 18px;border-radius:20px;font-weight:600;font-size:14px;margin-bottom:14px}.qf-badge-pass{background:#f0fdf4;color:#15803d;border:1px solid #bbf7d0}.qf-badge-fail{background:#fef2f2;color:#dc2626;border:1px solid #fca5a5}.qf-result-heading{font-size:24px;font-weight:700;margin-bottom:6px}.qf-result-sub{color:var(--qf-muted);font-size:14px;margin-bottom:28px}.qf-result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:28px}@media (max-width:480px){.qf-result-stats{grid-template-columns:1fr 1fr}}.qf-stat-box{background:var(--qf-card);border:1px solid var(--qf-border);border-radius:var(--qf-radius-sm);padding:16px;text-align:center}.qf-stat-num{font-size:22px;font-weight:700}.qf-stat-key{font-size:11px;color:var(--qf-muted);margin-top:3px}.qf-stat-num.qf-ok{color:var(--qf-success)}.qf-stat-num.qf-bad{color:var(--qf-error)}.qf-result-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:32px}.qf-tabs{display:flex;gap:4px;background:var(--qf-bg);border-radius:var(--qf-radius-sm);padding:4px;margin-bottom:20px}.qf-tab{flex:1;padding:9px;border:none;background:#fff0;border-radius:7px;font-size:13px;font-weight:500;cursor:pointer;color:var(--qf-muted);transition:all .2s}.qf-tab.qf-active{background:var(--qf-card);color:var(--qf-text);box-shadow:0 1px 6px rgb(0 0 0 / .08)}.qf-review-list{display:flex;flex-direction:column;gap:14px}.qf-review-item{background:var(--qf-card);border:1px solid var(--qf-border);border-left:4px solid var(--qf-border);border-radius:var(--qf-radius-sm);padding:18px}.qf-review-item.qf-correct{border-left-color:var(--qf-success)}.qf-review-item.qf-wrong{border-left-color:var(--qf-error)}.qf-review-status{font-size:11px;text-transform:uppercase;letter-spacing:.6px;color:var(--qf-muted);margin-bottom:7px}.qf-review-q{font-weight:600;margin-bottom:12px;line-height:1.4}.qf-review-ans{display:flex;flex-direction:column;gap:5px}.qf-ans-row{font-size:13px;display:flex;align-items:flex-start;gap:8px;color:var(--qf-muted);line-height:1.4}.qf-ans-row.qf-user-wrong{color:var(--qf-error)}.qf-ans-row.qf-correct-ans{color:var(--qf-success)}.qf-ans-tag{font-size:10px;padding:2px 7px;border-radius:10px;font-weight:600;flex-shrink:0;margin-top:2px}.qf-tag-wrong{background:#fef2f2;color:var(--qf-error)}.qf-tag-right{background:#f0fdf4;color:var(--qf-success)}.qf-explanation{font-size:12px;color:var(--qf-muted);margin-top:8px;padding-top:8px;border-top:1px solid var(--qf-border)}.qf-chart{margin:12px 0}.qf-chart-row{display:flex;align-items:center;gap:12px;margin-bottom:12px}.qf-chart-label{width:70px;font-size:12px;color:var(--qf-muted);text-align:right;flex-shrink:0}.qf-chart-bar{flex:1;height:10px;background:var(--qf-bg);border-radius:5px;overflow:hidden}.qf-chart-fill{height:100%;border-radius:5px;transition:width 1s ease}.qf-chart-val{width:28px;font-size:13px;font-weight:700;flex-shrink:0}.qf-quiz-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}.qf-quiz-card{background:var(--qf-card);border:1px solid var(--qf-border);border-radius:var(--qf-radius);overflow:hidden;box-shadow:var(--qf-shadow);transition:all .22s;display:flex;flex-direction:column}.qf-quiz-card:hover{transform:translateY(-4px);box-shadow:var(--qf-shadow-lg)}.qf-card-icon{font-size:36px;padding:24px 24px 0}.qf-card-body{padding:12px 24px 16px;flex:1}.qf-card-title{font-size:17px;font-weight:700;margin:0 0 8px}.qf-card-desc{font-size:13px;color:var(--qf-muted);margin-bottom:12px;line-height:1.5}.qf-card-meta{justify-content:flex-start}.qf-card-footer{padding:16px 24px;border-top:1px solid var(--qf-border);background:var(--qf-bg)}.qf-leaderboard{background:var(--qf-card);border:1px solid var(--qf-border);border-radius:var(--qf-radius);padding:24px;box-shadow:var(--qf-shadow)}.qf-lb-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-bottom:20px}.qf-lb-title{font-size:20px;font-weight:700;margin:0}.qf-lb-filters{display:flex;gap:6px}.qf-filter-btn{padding:6px 14px;border-radius:20px;border:1px solid var(--qf-border);background:#fff0;font-size:12px;font-weight:500;cursor:pointer;color:var(--qf-muted);transition:all .2s}.qf-filter-btn:hover,.qf-filter-btn.qf-active{background:var(--qf-primary);color:#fff;border-color:var(--qf-primary)}.qf-podium{display:flex;align-items:flex-end;justify-content:center;gap:8px;margin-bottom:28px;padding:20px 0 0}.qf-podium-item{flex:1;max-width:120px;display:flex;flex-direction:column;align-items:center;gap:6px}.qf-podium-av{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px;border:3px solid #fff0}.qf-podium-2 .qf-podium-av{border-color:var(--qf-silver)}.qf-podium-1 .qf-podium-av{border-color:var(--qf-gold);width:58px;height:58px;font-size:22px}.qf-podium-3 .qf-podium-av{border-color:var(--qf-bronze)}.qf-podium-name{font-size:12px;font-weight:600;text-align:center;max-width:100px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.qf-podium-score{font-size:11px;color:var(--qf-muted)}.qf-podium-block{width:100%;border-radius:6px 6px 0 0;display:flex;align-items:center;justify-content:center;font-size:22px}.qf-podium-2 .qf-podium-block{height:64px;background:linear-gradient(160deg,#b0b0c0,var(--qf-silver))}.qf-podium-1 .qf-podium-block{height:90px;background:linear-gradient(160deg,#e6c000,var(--qf-gold))}.qf-podium-3 .qf-podium-block{height:46px;background:linear-gradient(160deg,#8b5e1a,var(--qf-bronze))}.qf-lb-table-wrap{overflow-x:auto}.qf-lb-table{width:100%;border-collapse:collapse;font-size:13px}.qf-lb-table th{padding:9px 12px;text-align:left;border-bottom:2px solid var(--qf-border);font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--qf-muted)}.qf-lb-table td{padding:12px;border-bottom:1px solid var(--qf-border)}.qf-lb-table tr:last-child td{border-bottom:none}.qf-lb-table tr:hover td{background:var(--qf-bg)}.qf-me-row td{background:rgb(124 92 252 / .05)}.qf-me-row td:first-child{border-left:3px solid var(--qf-primary)}.qf-rank{font-size:16px}.qf-medal{font-size:20px}.qf-player-cell{display:flex;align-items:center;gap:9px}.qf-player-av{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex-shrink:0}.qf-you-badge{display:inline-flex;padding:1px 7px;border-radius:10px;font-size:10px;font-weight:600;background:rgb(124 92 252 / .15);color:var(--qf-primary);margin-left:5px}.qf-muted{color:var(--qf-muted)}.qf-score-cell{display:flex;align-items:center;gap:8px}.qf-mini-bar{height:6px;width:60px;background:var(--qf-bg);border-radius:3px;overflow:hidden;flex-shrink:0}.qf-mini-bar div{height:100%;background:linear-gradient(90deg,var(--qf-primary),var(--qf-accent));border-radius:3px}.qf-error{color:#dc2626;background:#fef2f2;border:1px solid #fca5a5;padding:10px 16px;border-radius:8px;font-size:14px}.qf-notice{color:#b45309;background:#fffbeb;border:1px solid #fde68a;padding:10px 16px;border-radius:8px;font-size:14px}.qf-empty{text-align:center;color:var(--qf-muted);padding:20px}@media (max-width:560px){.qf-start-card{padding:28px 18px}.qf-question{padding:18px}.qf-q-text{font-size:16px}.qf-nav{justify-content:center}.qf-result-stats{grid-template-columns:1fr 1fr}}