:root{--primary: #6366f1;--secondary: #a855f7;--accent: #f59e0b;--bg: #0f172a;--card: rgba(30, 41, 59, .7);--text: #f8fafc}.app-container{width:100%;height:100vh;background:radial-gradient(circle at top right,#1e1b4b,#0f172a);color:var(--text);font-family:PingFang SC,system-ui,sans-serif;overflow:hidden;position:relative;display:flex;justify-content:center;align-items:center}.cloud-badge{position:absolute;top:1rem;right:1rem;background:#ffffff1a;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);padding:4px 12px;border-radius:20px;font-size:12px;display:flex;align-items:center;gap:6px;color:#94a3b8;border:1px solid rgba(255,255,255,.05);z-index:100}.screen{width:100%;max-width:480px;height:100%;padding:2rem;display:flex;flex-direction:column;justify-content:center}.hero-section{text-align:center;margin-bottom:3rem}.logo-container{position:relative;display:inline-block;margin-bottom:1.5rem}.logo-icon{color:var(--primary);filter:drop-shadow(0 0 20px rgba(99,102,241,.5))}.sparkle-icon{position:absolute;top:-10px;right:-10px;color:var(--accent);animation:rotate 4s linear infinite}@keyframes rotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}h1{font-size:2.5rem;font-weight:800;background:linear-gradient(to bottom right,#fff,#94a3b8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin:0}.subtitle{color:#94a3b8;margin-top:.5rem}.stats-card{background:var(--card);border:1px solid rgba(255,255,255,.1);border-radius:24px;padding:1.5rem;display:flex;justify-content:space-around;margin-bottom:3rem;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.stat-item{display:flex;flex-direction:column;align-items:center;gap:8px;font-weight:600}.game-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.header-left{display:flex;flex-direction:column;gap:8px}.lives-display{display:flex;gap:4px}.score-display{display:flex;flex-direction:column}.score-display .label{font-size:10px;color:#64748b;letter-spacing:1px}.score-display .value{font-size:1.5rem;font-weight:800;font-variant-numeric:tabular-nums}.streak-badge{background:linear-gradient(45deg,#f59e0b,#ef4444);padding:6px 12px;border-radius:12px;font-weight:800;font-size:14px;display:flex;align-items:center;gap:4px;box-shadow:0 4px 15px #ef44444d}.progress-container{height:6px;background:#ffffff1a;border-radius:3px;margin-bottom:2rem;overflow:hidden}.progress-bar{height:100%;background:var(--primary);transition:width .4s cubic-bezier(.34,1.56,.64,1)}.question-area{flex:1}.subject-tag{display:inline-block;background:#6366f133;color:#818cf8;padding:4px 12px;border-radius:8px;font-size:12px;font-weight:600;margin-bottom:1rem}.question-text{font-size:1.5rem;line-height:1.4;margin-bottom:2rem}.options-grid{display:grid;gap:12px}.option-btn{background:var(--card);border:1px solid rgba(255,255,255,.05);padding:1rem 1.5rem;border-radius:16px;display:flex;align-items:center;gap:1rem;cursor:pointer;transition:all .2s;color:inherit;text-align:left}.option-btn:hover:not(:disabled){background:#ffffff1a;transform:translateY(-2px)}.option-btn.correct{background:#22c55e33;border-color:#22c55e}.option-btn.wrong{background:#ef444433;border-color:#ef4444}.opt-index{width:32px;height:32px;background:#ffffff1a;border-radius:8px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px}.primary-btn{background:linear-gradient(to right,var(--primary),var(--secondary));border:none;padding:1.2rem;border-radius:16px;color:#fff;font-weight:700;font-size:1.1rem;display:flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;box-shadow:0 10px 25px -5px #6366f166;transition:transform .2s}.primary-btn:active{transform:scale(.95)}.ai-btn{width:100%;background:#ffffff0d;border:1px dashed rgba(255,255,255,.2);padding:12px;border-radius:12px;color:#94a3b8;display:flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;margin-top:2rem}.ai-btn:hover{background:#ffffff1a;color:#fff}.feedback-overlay{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:center;z-index:50;pointer-events:none}.feedback-overlay.correct{color:#22c55e}.feedback-overlay.wrong{color:#ef4444}.loading-screen{display:flex;flex-direction:column;align-items:center;gap:1rem}.pulse{animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(1.1)}}.result-card{background:var(--card);padding:3rem 2rem;border-radius:32px;text-align:center;border:1px solid rgba(255,255,255,.1)}.trophy-icon{color:var(--accent);margin-bottom:1rem;filter:drop-shadow(0 0 20px rgba(245,158,11,.4))}.final-stats{display:grid;gap:1rem;margin:2rem 0}.f-stat{display:flex;justify-content:space-between;padding:12px;background:#ffffff0d;border-radius:12px}.action-group{display:flex;flex-direction:column;gap:12px}.secondary-btn{background:transparent;border:1px solid rgba(255,255,255,.1);color:#94a3b8;padding:12px;border-radius:12px;cursor:pointer}