*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,system-ui,sans-serif;background:#0b1120;color:#e0e7ff;min-height:100vh}.app{max-width:1200px;margin:0 auto;padding:0 16px 80px;position:relative}.bg-layer{position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(ellipse at 20% 50%,#1e293b,#0b1120 70%);z-index:-1}.glass{background:#1e293b99;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid rgba(148,163,184,.15);border-radius:16px;padding:16px}.header{display:flex;align-items:center;justify-content:space-between;margin:12px 0;padding:12px 20px}.header-left{display:flex;align-items:center;gap:12px}.logo-wrapper{position:relative}.logo-icon{color:#60a5fa}.logo-glow{position:absolute;top:-4px;left:-4px;width:40px;height:40px;background:radial-gradient(circle,rgba(96,165,250,.3),transparent);border-radius:50%}.title{font-size:1.5rem;font-weight:700;background:linear-gradient(135deg,#60a5fa,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.subtitle{font-size:.75rem;color:#94a3b8;display:block}.cloud-badge{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;color:#94a3b8;background:#94a3b826;padding:4px 10px;border-radius:20px}.header-right{display:flex;align-items:center;gap:12px}.score-pill{display:flex;align-items:center;gap:6px;background:linear-gradient(135deg,#fbbf24,#f59e0b);color:#1e293b;padding:6px 14px;border-radius:20px;font-weight:700}.nav{display:flex;gap:8px;justify-content:center;padding:10px;margin-bottom:16px}.nav-btn{display:flex;align-items:center;gap:6px;padding:8px 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span{font-size:1.1rem;font-weight:600}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.stat-card{display:flex;flex-direction:column;align-items:center;gap:8px;padding:20px}.stat-val{font-size:1.5rem;font-weight:700}.stat-lbl{font-size:.8rem;color:#94a3b8}.quiz-controls{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin-bottom:16px}.control-group{display:flex;flex-direction:column;gap:4px}.control-group label{font-size:.8rem;color:#94a3b8}.control-group select{background:#1e293bcc;color:#e0e7ff;border:1px solid rgba(148,163,184,.3);border-radius:8px;padding:8px 12px;font-size:.9rem}.btn-primary{display:flex;align-items:center;gap:8px;padding:10px 20px;background:linear-gradient(135deg,#60a5fa,#3b82f6);border:none;border-radius:12px;color:#fff;font-weight:600;cursor:pointer;transition:opacity .2s}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.spinner{width:18px;height:18px;border:3px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error-banner{display:flex;align-items:center;gap:8px;background:#ef444426;border:1px solid #ef4444;border-radius:12px;padding:12px;margin-bottom:16px;color:#fca5a5}.loading-indicator{display:flex;align-items:center;gap:12px;justify-content:center;padding:40px;color:#60a5fa;font-size:1.1rem}.spin{animation:spin 1s linear infinite}.question-card{padding:24px;margin-bottom:16px}.q-tags{display:flex;gap:8px;margin-bottom:12px}.tag{background:#60a5fa26;color:#60a5fa;padding:4px 12px;border-radius:20px;font-size:.8rem}.q-text{font-size:1.2rem;margin-bottom:20px;line-height:1.5}.options{display:flex;flex-direction:column;gap:10px}.option-btn{display:flex;align-items:center;gap:12px;padding:14px 18px;border:2px solid rgba(148,163,184,.3);border-radius:12px;background:transparent;color:#e0e7ff;font-size:1rem;cursor:pointer;transition:all .2s;text-align:left}.option-btn:hover{border-color:#60a5fa}.option-btn.selected{border-color:#60a5fa;background:#60a5fa1a}.option-btn.correct{border-color:#22c55e;background:#22c55e1a}.option-btn.wrong{border-color:#ef4444;background:#ef44441a}.option-letter{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:#94a3b833;font-weight:700}.icon-correct{color:#22c55e;margin-left:auto}.icon-wrong{color:#ef4444;margin-left:auto}.btn-submit{width:100%;margin-top:16px;padding:14px;background:linear-gradient(135deg,#22c55e,#16a34a);border:none;border-radius:12px;color:#fff;font-weight:700;font-size:1rem;cursor:pointer}.feedback{margin-top:16px}.explanation{background:#94a3b81a;border-radius:12px;padding:16px;line-height:1.6}.btn-next{display:flex;align-items:center;gap:8px;margin-top:12px;padding:12px 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rgba(148,163,184,.2);background:#1e293b66;opacity:.5}.element-cell:hover{transform:scale(1.05)}.el-num{font-size:.65rem;color:#94a3b8}.el-sym{font-size:1.3rem;font-weight:700;color:var(--el-color)}.el-name{font-size:.7rem;color:#94a3b8}.lock-icon{position:absolute;top:6px;right:6px;color:#64748b}.table-hint{text-align:center;color:#64748b;font-size:.9rem}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:100}.modal{position:relative;max-width:400px;width:90%;padding:32px}.modal-close{position:absolute;top:12px;right:12px;background:transparent;border:none;color:#94a3b8;font-size:1.2rem;cursor:pointer}.modal-header{display:flex;align-items:baseline;gap:12px;margin-bottom:16px}.modal-sym{font-size:2.5rem;font-weight:800}.modal-name{font-size:1.5rem}.modal-z{font-size:1rem;color:#94a3b8}.modal-cat{margin-bottom:12px;color:#94a3b8}.modal-desc{line-height:1.6}.lab-controls{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin-bottom:16px}.exp-result{padding:20px;margin-bottom:16px;font-size:1.1rem;text-align:center;background:#60a5fa1a;border:1px solid rgba(96,165,250,.3)}.reactions-list{margin-top:20px}.reactions-list h3{display:flex;align-items:center;gap:8px;margin-bottom:12px}.reaction-item{display:flex;flex-wrap:wrap;gap:12px;padding:12px 16px;margin-bottom:8px;align-items:center}.reaction-el{background:linear-gradient(135deg,#fbbf24,#f59e0b);color:#1e293b;padding:4px 12px;border-radius:20px;font-weight:700;font-size:.9rem}.reaction-type{color:#60a5fa;font-size:.9rem}.reaction-effect{color:#94a3b8;flex:1}.score-summary{display:flex;flex-direction:column;align-items:center;gap:16px;padding:32px;margin-bottom:20px;text-align:center}.score-main{display:flex;align-items:center;gap:16px;color:#fbbf24}.score-total{font-size:3rem;font-weight:800}.score-details p{color:#94a3b8;margin:4px 0}.btn-secondary{display:flex;align-items:center;gap:8px;padding:10px 20px;background:#60a5fa33;border:1px solid #60a5fa;border-radius:12px;color:#60a5fa;font-weight:600;cursor:pointer}.wrong-list h3{display:flex;align-items:center;gap:8px;margin-bottom:12px}.no-wrong{text-align:center;color:#64748b;padding:40px}.wrong-item{padding:16px;margin-bottom:10px}.wrong-q{font-size:1.1rem;margin-bottom:8px}.wrong-answer{color:#fca5a5}.correct-answer{color:#86efac}.wrong-exp{color:#94a3b8;margin-top:8px;font-style:italic}.toast{position:fixed;bottom:100px;left:50%;transform:translate(-50%);padding:12px 28px;background:#1e293bf2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid rgba(148,163,184,.3);border-radius:12px;color:#e0e7ff;font-weight:600;z-index:200;animation:fadeInUp .3s ease}@keyframes fadeInUp{0%{opacity:0;transform:translate(-50%) translateY(10px)}to{opacity:1;transform:translate(-50%) translateY(0)}}@media (max-width: 768px){.table-grid{grid-template-columns:repeat(5,1fr)}.home-cards{grid-template-columns:1fr 1fr}.stats-grid{grid-template-columns:repeat(3,1fr)}.nav{gap:4px}.nav-btn{font-size:.8rem;padding:6px 10px}}