*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#f5f5f7;--card:#fff;--accent:#0071e3;--accent-h:#0077ed;--success:#34c759;--danger:#ff3b30;--warning:#ff9500;--text:#1d1d1f;--text2:#6e6e73;--border:#d2d2d7;--radius:14px;--sm:8px}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}.container{max-width:800px;margin:0 auto;padding:0 16px 64px}nav{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);z-index:100;background:#ffffffd9;position:sticky;top:0}.nav-inner{align-items:center;gap:8px;max-width:800px;height:52px;margin:0 auto;padding:0 16px;display:flex}.nav-brand{cursor:pointer;margin-right:auto;font-size:1.05rem;font-weight:700}.nav-link{color:var(--text2);cursor:pointer;border-radius:20px;padding:6px 12px;font-size:.88rem;transition:background .12s,color .12s}.nav-link:hover,.nav-link.active{background:var(--bg);color:var(--accent)}.card{background:var(--card);border-radius:var(--radius);padding:24px;box-shadow:0 2px 12px #00000012}.btn{border-radius:var(--sm);cursor:pointer;border:none;justify-content:center;align-items:center;gap:6px;padding:9px 20px;font-size:.92rem;font-weight:500;transition:background .12s,transform 80ms;display:inline-flex}.btn:active{transform:scale(.97)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-h)}.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:#e8e8ed}.btn-danger{background:var(--danger);color:#fff}.btn-sm{padding:6px 14px;font-size:.83rem}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}.field{margin-bottom:16px}.label{color:var(--text2);margin-bottom:6px;font-size:.82rem;font-weight:600;display:block}.input,.textarea,.select{border-radius:var(--sm);border:1.5px solid var(--border);background:#fff;width:100%;padding:9px 12px;font-family:inherit;font-size:.93rem;transition:border-color .15s}.input:focus,.textarea:focus,.select:focus{border-color:var(--accent);outline:none}.textarea{resize:vertical;min-height:100px}.badge{border-radius:20px;padding:3px 10px;font-size:.75rem;font-weight:600;display:inline-block}.badge-blue{color:var(--accent);background:#e8f0fb}.badge-green{color:#1a7f37;background:#e8fbe8}.badge-red{color:var(--danger);background:#fbe8e8}.badge-orange{color:var(--warning);background:#fff3e0}.page-header{padding:32px 0 20px}.page-title{font-size:1.75rem;font-weight:700}.page-sub{color:var(--text2);margin-top:6px}.divider{border:none;border-top:1px solid var(--border);margin:20px 0}.alert{border-radius:var(--sm);margin-bottom:16px;padding:12px 16px;font-size:.9rem}.alert-error{color:#c0392b;background:#fbe8e8}.alert-success{color:#1a7f37;background:#e8fbe8}.spinner{border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;width:36px;height:36px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.center{justify-content:center;align-items:center;padding:60px;display:flex}.quiz-card{background:var(--card);border-radius:var(--radius);cursor:pointer;align-items:flex-start;gap:16px;margin-bottom:12px;padding:20px;transition:box-shadow .15s,transform .1s;display:flex;box-shadow:0 2px 10px #0000000f}.quiz-card:hover{transform:translateY(-1px);box-shadow:0 4px 18px #0000001a}.quiz-icon{flex-shrink:0;font-size:2rem}.quiz-info{flex:1}.quiz-title{margin-bottom:6px;font-size:1.05rem;font-weight:600}.quiz-meta{color:var(--text2);flex-wrap:wrap;gap:12px;font-size:.82rem;display:flex}.progress-bg{background:var(--border);border-radius:99px;height:6px}.progress-fill{background:var(--accent);border-radius:99px;height:100%;transition:width .3s}.timer{font-variant-numeric:tabular-nums;border-radius:var(--sm);background:var(--bg);border:1.5px solid var(--border);padding:5px 14px;font-size:1.3rem;font-weight:700}.timer.warning{color:var(--warning);border-color:var(--warning);background:#fff8ee}.timer.danger{color:var(--danger);border-color:var(--danger);background:#fff0ef}.option{border-radius:var(--sm);border:2px solid var(--border);cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:12px;margin-bottom:10px;padding:12px 16px;font-size:.95rem;transition:border-color .12s,background .12s;display:flex}.option:hover{border-color:var(--accent);background:#f0f6ff}.option.selected{border-color:var(--accent);background:#e8f0fb}.option.correct{border-color:var(--success);background:#e8fbe8}.option.wrong{border-color:var(--danger);background:#fbe8e8}.option-letter{background:var(--bg);border:1.5px solid var(--border);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:.78rem;font-weight:700;transition:all .12s;display:flex}.option.selected .option-letter{background:var(--accent);color:#fff;border-color:var(--accent)}.option.correct .option-letter{background:var(--success);color:#fff;border-color:var(--success)}.option.wrong .option-letter{background:var(--danger);color:#fff;border-color:var(--danger)}.score-circle{border:6px solid var(--accent);border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:120px;height:120px;margin:0 auto 24px;display:flex}.score-num{font-size:2.2rem;font-weight:800}.score-deno{color:var(--text2);font-size:.85rem}.lb-row{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:12px 0;display:flex}.lb-rank{text-align:center;width:32px;color:var(--text2);font-size:1rem;font-weight:700}.lb-name{flex:1;font-weight:500}.lb-score{color:var(--accent);font-weight:700}.lb-time{color:var(--text2);text-align:right;width:60px;font-size:.82rem}.tab-bar{border-bottom:1px solid var(--border);margin-bottom:24px;display:flex}.tab-item{cursor:pointer;color:var(--text2);border-bottom:2px solid #0000;margin-bottom:-1px;padding:10px 20px;font-size:.9rem;transition:color .12s}.tab-item.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:500}