*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Roboto,sans-serif;background:#f0f6ff;color:#1e293b;min-height:100vh}.app{max-width:800px;margin:0 auto;padding:16px;position:relative}.header{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid #e2e8f0;margin-bottom:16px}.header-left{display:flex;align-items:center;gap:8px}.title{font-size:1.2rem;font-weight:700;color:#2563eb}.cloud-badge{font-size:.7rem;background:#dbeafe;padding:2px 8px;border-radius:12px;color:#1d4ed8}.header-right{display:flex;align-items:center;gap:12px}.score-badge{display:flex;align-items:center;gap:4px;background:#fef9c3;padding:4px 10px;border-radius:20px;font-weight:600;color:#854d0e}.nav-tabs{display:flex;gap:4px}.nav-btn{background:transparent;border:none;cursor:pointer;padding:6px;border-radius:8px;color:#64748b;transition:background .2s}.nav-btn.active{background:#2563eb;color:#fff}.nav-btn:hover:not(.active){background:#e2e8f0}.page{padding:0 0 80px;min-height:70vh}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:60vh;gap:16px}.spinner{width:40px;height:40px;border:4px solid #e2e8f0;border-top-color:#2563eb;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.achievement-section{margin-bottom:20px}.achievement-section h2{display:flex;align-items:center;gap:6px;font-size:1rem;margin-bottom:10px;color:#334155}.achievement-list{display:flex;gap:10px;flex-wrap:wrap}.achievement-badge{display:flex;align-items:center;gap:4px;background:#fff;padding:6px 12px;border-radius:20px;box-shadow:0 2px 8px #0000000d;font-size:.85rem}.achievement-badge.locked{opacity:.5}.rooms-section h2{display:flex;align-items:center;gap:6px;font-size:1rem;margin-bottom:10px;color:#334155}.room-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}.room-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 4px 12px #0000000f;cursor:pointer;transition:box-shadow .2s}.room-card:hover{box-shadow:0 6px 20px #2563eb1f}.room-card.locked{opacity:.6;cursor:default}.room-cover{position:relative;height:120px;overflow:hidden;background:#f1f5f9}.room-cover img{width:100%;height:100%;object-fit:cover}.lock-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#0000004d;color:#fff}.room-info{padding:12px}.room-info h3{font-size:1rem;margin-bottom:4px}.room-info p{font-size:.8rem;color:#64748b}.challenge-button{display:flex;align-items:center;gap:8px;margin:20px auto;padding:12px 28px;background:#7c3aed;color:#fff;border:none;border-radius:40px;font-size:1rem;font-weight:600;cursor:pointer;box-shadow:0 4px 12px #7c3aed4d}.question-card{background:#fff;border-radius:16px;padding:20px;box-shadow:0 4px 12px #0000000f;max-width:500px;margin:0 auto}.question-header{display:flex;justify-content:space-between;align-items:flex-start;gap:8px;margin-bottom:16px}.question-text{font-size:1.1rem;font-weight:500;line-height:1.5}.speak-btn{background:#e0e7ff;border:none;border-radius:50%;width:36px;height:36px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:#4338ca;flex-shrink:0}.speak-btn:hover{background:#c7d2fe}.options{display:flex;flex-direction:column;gap:10px}.option-btn{padding:12px 16px;border:2px solid #e2e8f0;border-radius:12px;background:#fff;font-size:1rem;text-align:left;cursor:pointer;transition:border-color .2s,background .2s}.option-btn:hover:not(:disabled){border-color:#2563eb;background:#eff6ff}.option-btn.correct{border-color:#22c55e;background:#f0fdf4}.option-btn.shake{animation:shake .3s;border-color:#ef4444;background:#fef2f2}@keyframes shake{0%,to{translate:0}25%{translate:-4px}75%{translate:4px}}.feedback{display:flex;align-items:center;gap:6px;margin-top:12px;font-weight:500}.correct-feedback{color:#16a34a}.wrong-feedback{color:#dc2626}.progress-bar{height:6px;background:#e2e8f0;border-radius:3px;margin:8px 0;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#2563eb,#7c3aed);border-radius:3px;transition:width .3s}.q-count{text-align:center;font-size:.85rem;color:#64748b;margin-bottom:8px}.challenge-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;font-weight:500}.timer{display:flex;align-items:center;gap:4px;color:#dc2626}.library-page h2{display:flex;align-items:center;gap:6px}.progress-text{color:#64748b;margin:4px 0 8px}.resource-list{display:flex;flex-direction:column;gap:10px;margin-top:16px}.resource-card{display:flex;align-items:center;gap:12px;background:#fff;padding:14px;border-radius:12px;box-shadow:0 2px 8px #0000000a;cursor:pointer;transition:box-shadow .2s}.resource-card.completed{border-left:4px solid #22c55e}.resource-icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:10px;background:#e0e7ff;color:#4338ca}.resource-info{flex:1;display:flex;flex-direction:column}.resource-title{font-weight:500}.resource-status{font-size:.75rem;color:#64748b}.speak-btn-small{background:transparent;border:none;cursor:pointer;color:#6366f1;padding:4px}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:#1e293b;color:#fff;padding:10px 20px;border-radius:40px;font-size:.9rem;box-shadow:0 4px 12px #0003;z-index:100;animation:toastUp .3s}@keyframes toastUp{0%{opacity:0;translate:0 20px}to{opacity:1;translate:0}}@media (max-width: 600px){.room-grid{grid-template-columns:1fr}.header-left .title{font-size:1rem}}