:root{--bg: #0f0f1a;--surface: #1a1a2e;--surface2: #25253d;--text: #f0f0ff;--text-dim: #8888aa;--accent: #6c5ce7;--accent2: #a29bfe;--success: #4ecdc4;--danger: #ff6b6b;--warning: #f7dc6f;--radius: 16px;--radius-sm: 10px}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{min-height:100vh;background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,-apple-system,sans-serif;line-height:1.5}.app{min-height:100vh;padding:1rem;max-width:520px;margin:0 auto}.screen{display:flex;flex-direction:column;gap:1.25rem;padding-bottom:2rem}.screen-title{font-size:1.75rem;font-weight:800;letter-spacing:-.02em;text-align:center;margin-top:.5rem}.screen-sub{text-align:center;color:var(--text-dim);font-size:.95rem}.back-btn{background:none;border:none;color:var(--accent2);font-size:1rem;cursor:pointer;padding:.5rem 0;font-weight:600;align-self:flex-start;transition:opacity .2s}.back-btn:hover{opacity:.7}.home{align-items:center;text-align:center;padding-top:2rem}.home-hero{margin-bottom:1rem}.home-logo{font-size:4rem;margin-bottom:.5rem;animation:bounce 2s ease-in-out infinite}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.home-title{font-size:2.5rem;font-weight:900;background:linear-gradient(135deg,#ff6b9d,#c44dff,#45b7d1,#4ecdc4,#f7dc6f);background-size:300% 300%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradient 4s ease infinite}@keyframes gradient{0%,to{background-position:0% 50%}50%{background-position:100% 50%}}.home-subtitle{color:var(--text-dim);font-size:1rem;margin-top:.25rem}.home-stats{display:flex;gap:.75rem;justify-content:center;flex-wrap:wrap}.stat-pill{display:flex;flex-direction:column;align-items:center;background:var(--surface);border-radius:var(--radius);padding:.75rem 1.25rem;min-width:70px;border:1px solid rgba(255,255,255,.06)}.stat-icon{font-size:1.25rem}.stat-val{font-size:1.25rem;font-weight:800}.stat-label{font-size:.7rem;color:var(--text-dim);text-transform:uppercase;letter-spacing:.1em}.home-menu{display:flex;flex-direction:column;gap:.75rem;width:100%}.menu-btn{display:flex;align-items:center;gap:1rem;background:var(--surface);border:2px solid transparent;border-radius:var(--radius);padding:1.25rem;cursor:pointer;color:var(--text);text-align:left;transition:all .2s}.menu-btn:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 8px 25px #6c5ce733}.menu-icon{font-size:2rem}.menu-title{display:block;font-size:1.1rem;font-weight:700}.menu-desc{display:block;font-size:.8rem;color:var(--text-dim)}.play-btn:hover{border-color:#4ecdc4;box-shadow:0 8px 25px #4ecdc433}.battle-btn:hover{border-color:#ff6b6b;box-shadow:0 8px 25px #ff6b6b33}.rank-btn:hover{border-color:#f7dc6f;box-shadow:0 8px 25px #f7dc6f33}.reward-btn:hover{border-color:#a29bfe;box-shadow:0 8px 25px #a29bfe33}.category-grid{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}.category-card{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1.5rem 1rem;border-radius:var(--radius);border:none;cursor:pointer;color:#fff;font-weight:700;transition:all .2s;box-shadow:0 4px 15px #0000004d;min-height:140px}.category-card:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 8px 30px #0006}.cat-emoji{font-size:2.5rem;margin-bottom:.5rem}.cat-name{font-size:1.1rem;font-weight:800}.cat-count{font-size:.75rem;opacity:.8;margin-top:.25rem}.quiz-header{display:flex;flex-direction:column;gap:.5rem}.quiz-info{display:flex;justify-content:space-between;align-items:center}.quiz-cat-badge{display:inline-flex;align-items:center;gap:.4rem;padding:.4rem .8rem;border-radius:20px;font-size:.85rem;font-weight:700;color:#fff}.quiz-counter{font-size:.9rem;color:var(--text-dim);font-weight:600}.progress-bar{width:100%;height:6px;background:var(--surface2);border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:3px;transition:width .4s ease}.battle-fill{background:linear-gradient(90deg,#ff6b6b,#f7dc6f)}.quiz-score-bar{display:flex;align-items:center;gap:1rem;font-weight:700}.streak-badge{font-size:.85rem;background:linear-gradient(135deg,#ff6b6b,#f7dc6f);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:pulse .6s ease-in-out infinite alternate}@keyframes pulse{0%{transform:scale(1)}to{transform:scale(1.1)}}.timer-ring-wrap{display:flex;justify-content:center;align-items:center;position:relative;width:80px;height:80px;margin:0 auto}.timer-ring-wrap.small{width:60px;height:60px}.timer-ring{width:100%;height:100%}.timer-text{position:absolute;font-size:1.5rem;font-weight:900}.timer-ring-wrap.small .timer-text{font-size:1.2rem}.question-card{background:var(--surface);border-radius:var(--radius);padding:1.5rem;border:1px solid rgba(255,255,255,.06)}.question-text{font-size:1.15rem;font-weight:700;margin-bottom:1.25rem;line-height:1.4}.options-grid{display:flex;flex-direction:column;gap:.6rem}.option-btn{display:flex;align-items:center;gap:.75rem;background:var(--surface2);border:2px solid rgba(255,255,255,.08);border-radius:var(--radius-sm);padding:.85rem 1rem;cursor:pointer;color:var(--text);font-size:.95rem;font-weight:500;transition:all .15s;text-align:left;width:100%}.option-btn:hover{border-color:var(--accent);background:#6c5ce726;transform:translate(4px)}.option-letter{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:8px;background:#ffffff14;font-weight:800;font-size:.8rem;flex-shrink:0}.battle-header{display:flex;align-items:center;justify-content:space-between;gap:.5rem;background:var(--surface);border-radius:var(--radius);padding:1rem}.battle-player{display:flex;flex-direction:column;align-items:center;gap:.25rem;flex:1}.bp-avatar{font-size:2rem}.bp-name{font-size:.8rem;color:var(--text-dim);font-weight:600}.bp-score{font-size:1.5rem;font-weight:900}.battle-vs{font-size:1.2rem;font-weight:900;color:var(--danger);text-shadow:0 0 10px rgba(255,107,107,.5)}.battle-round{text-align:center;font-size:.85rem;color:var(--text-dim);font-weight:600}.result-screen{align-items:center}.result-card{background:var(--surface);border-radius:var(--radius);padding:2rem 1.5rem;text-align:center;width:100%;border:1px solid rgba(255,255,255,.06)}.result-title{font-size:1.75rem;font-weight:900;margin-bottom:1rem}.battle-title{font-size:2rem}.result-score-circle{display:flex;flex-direction:column;align-items:center;justify-content:center;width:120px;height:120px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));margin:0 auto 1rem}.result-percent{font-size:2rem;font-weight:900}.result-fraction{font-size:.8rem;opacity:.8}.result-stars{font-size:1.25rem;letter-spacing:.1em;margin-bottom:.25rem}.result-stars-text{font-weight:700;color:var(--warning);margin-bottom:1.25rem}.result-stats{display:flex;justify-content:center;gap:2rem;margin-bottom:1.5rem}.result-stat{display:flex;flex-direction:column;align-items:center}.rs-label{font-size:.7rem;color:var(--text-dim);text-transform:uppercase;letter-spacing:.1em}.rs-value{font-size:1.1rem;font-weight:800}.result-answers{display:flex;flex-direction:column;gap:.4rem;margin-bottom:1.5rem;text-align:left}.answer-review{display:flex;align-items:center;gap:.5rem;padding:.5rem .75rem;border-radius:var(--radius-sm);font-size:.8rem;background:var(--surface2)}.answer-review.correct{border-left:3px solid var(--success)}.answer-review.wrong{border-left:3px solid var(--danger)}.answer-review.timeout{border-left:3px solid var(--warning)}.ar-num{font-weight:800;color:var(--text-dim);min-width:20px}.ar-icon{font-size:.9rem}.ar-text{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ar-answer{color:var(--success);font-weight:600;font-size:.75rem}.result-actions{display:flex;gap:.75rem;justify-content:center}.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;border:none;border-radius:var(--radius-sm);padding:.85rem 2rem;font-size:1rem;font-weight:700;cursor:pointer;transition:all .2s}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px #6c5ce74d}.btn-secondary{background:var(--surface2);color:var(--text);border:2px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);padding:.85rem 2rem;font-size:1rem;font-weight:700;cursor:pointer;transition:all .2s}.btn-secondary:hover{border-color:var(--accent)}.battle-final-scores{display:flex;align-items:center;justify-content:center;gap:1.5rem;margin-bottom:1rem}.bfs-player{display:flex;flex-direction:column;align-items:center;gap:.25rem;padding:1rem;border-radius:var(--radius);background:var(--surface2);min-width:100px}.bfs-player.winner{background:linear-gradient(135deg,#f7dc6f33,#ff6b6b33);border:2px solid var(--warning);box-shadow:0 0 20px #f7dc6f33}.bfs-avatar{font-size:2rem}.bfs-name{font-size:.8rem;color:var(--text-dim)}.bfs-score{font-size:2rem;font-weight:900}.bfs-vs{font-weight:900;color:var(--text-dim)}.battle-round-results{display:flex;flex-direction:column;gap:.3rem;margin-bottom:1.5rem}.brr-row{display:flex;align-items:center;gap:.5rem;padding:.4rem .5rem;background:var(--surface2);border-radius:8px;font-size:.75rem}.brr-q{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:left}.brr-win{color:var(--success)}.brr-loss{color:var(--danger)}.rank-tabs{display:flex;gap:.5rem;justify-content:center}.rank-tab{background:var(--surface2);border:2px solid transparent;border-radius:20px;padding:.5rem 1rem;color:var(--text-dim);font-weight:600;font-size:.85rem;cursor:pointer;transition:all .2s}.rank-tab.active{border-color:var(--accent);color:var(--text);background:#6c5ce726}.rank-list{display:flex;flex-direction:column;gap:.4rem}.rank-row{display:flex;align-items:center;gap:.75rem;background:var(--surface);border-radius:var(--radius-sm);padding:.75rem 1rem;border:2px solid transparent;transition:all .2s}.rank-row.you{border-color:var(--accent);background:#6c5ce71a}.rank-pos{font-size:1.1rem;font-weight:900;min-width:30px;text-align:center}.rank-avatar{font-size:1.5rem}.rank-name{flex:1;font-weight:600}.rank-val{font-weight:800}.rewards-grid{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}.reward-card{display:flex;flex-direction:column;align-items:center;gap:.3rem;background:var(--surface);border-radius:var(--radius);padding:1.25rem .75rem;text-align:center;border:2px solid transparent;transition:all .2s}.reward-card.unlocked{border-color:var(--success);background:#4ecdc414}.reward-card.locked{opacity:.7}.reward-emoji{font-size:2rem}.reward-name{font-weight:800;font-size:.9rem}.reward-desc{font-size:.7rem;color:var(--text-dim)}.reward-progress-bar{width:100%;height:4px;background:var(--surface2);border-radius:2px;overflow:hidden;margin-top:.25rem}.reward-progress-fill{height:100%;background:var(--accent);border-radius:2px;transition:width .4s ease}.reward-progress-text{font-size:.65rem;color:var(--text-dim)}.badge-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:100;padding:1rem;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.badge-popup{background:var(--surface);border-radius:var(--radius);padding:2rem;text-align:center;max-width:350px;width:100%;border:2px solid var(--warning);box-shadow:0 0 40px #f7dc6f33;animation:popIn .4s cubic-bezier(.175,.885,.32,1.275)}@keyframes popIn{0%{transform:scale(.7);opacity:0}to{transform:scale(1);opacity:1}}.badge-popup h2{font-size:1.5rem;margin-bottom:1.25rem}.badge-list{display:flex;flex-direction:column;gap:.75rem;margin-bottom:1.5rem}.badge-item{display:flex;align-items:center;gap:.75rem;background:var(--surface2);border-radius:var(--radius-sm);padding:.75rem;text-align:left}.badge-emoji{font-size:2rem}.badge-name{font-weight:800;display:block}.badge-desc{font-size:.8rem;color:var(--text-dim);display:block}@media(max-width:400px){.app{padding:.5rem}.home-title{font-size:2rem}.category-grid,.rewards-grid{grid-template-columns:1fr}.home-stats{gap:.5rem}.stat-pill{padding:.5rem .75rem;min-width:60px}}