:root{--primary: #f59e0b;--primary-dark: #d97706;--primary-light: #fef3c7;--bg-gradient: linear-gradient(135deg, #fef3c7 0%, #fffbeb 100%);--text-main: #1e293b;--text-muted: #64748b;--shadow-sm: 0 2px 4px rgba(0,0,0,.05);--shadow-md: 0 10px 15px -3px rgba(0,0,0,.1);--radius: 16px}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg-gradient);color:var(--text-main);min-height:100vh}.app-container{max-width:600px;margin:0 auto;padding:20px 16px;box-sizing:border-box}.app-header{text-align:center;margin-bottom:24px}.logo-area{display:flex;align-items:center;justify-content:center;gap:8px}.version-tag{font-size:12px;background:#ef4444;color:#fff;padding:2px 6px;border-radius:8px;vertical-align:middle}.icon-logo{color:var(--primary-dark);width:32px;height:32px}.app-header h1{font-size:28px;font-weight:800;margin:0;background:linear-gradient(to right,#d97706,#b45309);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.subtitle{font-size:14px;color:var(--text-muted);margin-top:4px}.card{background:#fff;border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-md);border:2px solid #fef3c7;margin-bottom:20px}.home-card{text-align:center}.avatar-container{position:relative;width:100px;height:100px;margin:0 auto 16px}.avatar{width:100%;height:100%;border-radius:50%;object-fit:cover;border:4px solid var(--primary)}.pulse-glow{box-shadow:0 0 #f59e0bb3;animation:pulse 1.5s infinite}@keyframes pulse{0%{transform:scale(.98);box-shadow:0 0 #f59e0b66}70%{transform:scale(1);box-shadow:0 0 0 10px #f59e0b00}to{transform:scale(.98);box-shadow:0 0 #f59e0b00}}.vs-badge{position:absolute;top:-5px;right:-5px;background:#ef4444;color:#fff;font-weight:900;padding:4px 8px;border-radius:20px;font-size:12px;transform:rotate(15deg);box-shadow:var(--shadow-sm);z-index:2}.intro-text{color:var(--text-muted);line-height:1.6;font-size:15px}.button-group{display:flex;flex-direction:column;gap:12px;margin-top:24px}.btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:14px 24px;font-size:16px;font-weight:700;border-radius:12px;border:none;cursor:pointer;transition:all .2s ease}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 6px -1px #f59e0b66}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px)}.btn-secondary{background:#fffbeb;color:var(--primary-dark);border:2px solid var(--primary-light)}.btn-secondary:hover{background:var(--primary-light)}.btn-text{background:transparent;border:none;color:var(--text-muted);font-size:14px;cursor:pointer;display:inline-flex;align-items:center;gap:4px;margin-top:12px}.btn-text:hover{color:var(--primary-dark)}.quiz-top-bar{display:flex;justify-content:space-between;margin-bottom:12px}.difficulty-badge{display:flex;align-items:center;gap:4px;font-size:12px;font-weight:700;background:#fff;padding:4px 10px;border-radius:20px;box-shadow:var(--shadow-sm)}.timer-badge{display:flex;align-items:center;gap:4px;font-size:12px;font-weight:700;background:#fee2e2;color:#ef4444;padding:4px 10px;border-radius:20px;box-shadow:var(--shadow-sm)}.danger-blink{animation:blink .5s infinite alternate}@keyframes blink{0%{background:#fee2e2;color:#ef4444}to{background:#ef4444;color:#fff}}.progress-bar-container{margin-bottom:16px}.progress-info{display:flex;justify-content:space-between;font-size:13px;color:var(--text-muted);margin-bottom:6px}.category-tag{background:var(--primary-light);color:var(--primary-dark);padding:2px 8px;border-radius:20px;font-weight:700}.progress-track{height:8px;background:#e2e8f0;border-radius:4px;overflow:hidden}.progress-fill{height:100%;background:var(--primary);transition:width .3s ease}.question-card{background:#fffbeb;border-left:6px solid var(--primary)}.question-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.speaker{font-weight:700;color:var(--primary-dark)}.btn-voice{background:#fff;border:1px solid var(--primary-light);color:var(--primary-dark);padding:4px 8px;border-radius:20px;font-size:12px;cursor:pointer;display:flex;align-items:center;gap:4px}.question-text{font-size:20px;line-height:1.5;margin:0;color:var(--text-main)}.options-list{display:flex;flex-direction:column;gap:12px;margin-top:16px}.option-btn{display:flex;align-items:center;text-align:left;padding:16px;border-radius:12px;background:#fff;border:2px solid #e2e8f0;cursor:pointer;transition:all .2s ease;font-size:16px;position:relative}.option-letter{font-weight:800;color:var(--text-muted);margin-right:12px;font-size:18px;display:flex;flex-direction:column;align-items:center}.keyboard-tip{font-size:9px;color:#94a3b8;font-weight:400;margin-top:2px}.option-text{flex:1;color:var(--text-main);line-height:1.4}.hover-effect:hover{border-color:var(--primary);background:#fffbeb;transform:translateY(-2px);box-shadow:var(--shadow-sm)}.correct{border-color:#10b981!important;background:#ecfdf5!important}.incorrect{border-color:#ef4444!important;background:#fef2f2!important}.disabled{opacity:.6;cursor:not-allowed}.status-icon{margin-left:8px}.text-green{color:#10b981}.text-red{color:#ef4444}.analysis-card{margin-top:20px;background:#f8fafc;border:1px solid #e2e8f0}.timeout-card{border-left:6px solid #ef4444}.analysis-header{font-weight:700;font-size:16px;margin-bottom:8px}.analysis-text{color:var(--text-muted);font-size:14px;line-height:1.5;margin-bottom:16px}.keyboard-hint{text-align:center;font-size:11px;color:var(--text-muted);margin-top:12px;display:flex;align-items:center;justify-content:center;gap:4px}.summary-card{text-align:center}.trophy-container{font-size:48px;margin-bottom:12px}.score-board{display:flex;justify-content:space-around;margin:20px 0;background:#f8fafc;padding:16px;border-radius:12px}.score-item{display:flex;flex-direction:column}.score-item .label{font-size:12px;color:var(--text-muted)}.score-item .value{font-size:24px;font-weight:800}.chart-container{margin-top:24px;background:#f8fafc;padding:16px;border-radius:12px;border:1px solid #e2e8f0}.chart-title{display:flex;align-items:center;gap:6px;margin:0 0 12px;font-size:14px;color:var(--text-main)}.svg-chart-wrapper{background:#fff;padding:8px;border-radius:8px}.svg-chart{width:100%;height:auto}.wrongs-card{text-align:left}.flex-between{display:flex;justify-content:space-between;align-items:center}.btn-clear{background:transparent;border:none;color:#ef4444;cursor:pointer;font-size:14px}.empty-state{text-align:center;padding:40px 16px;color:var(--text-muted)}.empty-text{font-size:14px;line-height:1.6;margin-top:12px}.wrongs-list{display:flex;flex-direction:column;gap:16px;margin-top:16px;max-height:300px;overflow-y:auto}.wrong-item{background:#f8fafc;border:1px solid #e2e8f0;padding:14px;border-radius:8px}.wrong-category{font-size:11px;color:var(--primary-dark);font-weight:700;margin-bottom:4px}.wrong-q{font-weight:700;margin-bottom:8px}.wrong-ans{background:#fff;padding:8px;border-radius:6px;border-left:3px solid #10b981}.correct-ans-title{font-size:12px;color:#10b981;font-weight:700}.correct-ans-text{font-size:14px;margin:4px 0}.correct-ans-analysis{font-size:12px;color:var(--text-muted)}.ai-card textarea{width:100%;height:100px;padding:12px;border-radius:8px;border:2px solid #e2e8f0;resize:none;font-family:inherit;box-sizing:border-box}.ai-card textarea:focus{border-color:var(--primary);outline:none}.input-area{position:relative;margin-top:16px}.char-count{position:absolute;bottom:8px;right:8px;font-size:12px;color:var(--text-muted)}.ai-loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px 0}.spinner{width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid var(--primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-text{margin-top:12px;font-size:14px;color:var(--primary-dark);font-weight:700}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}.animate-shake{animation:shake .2s ease-in-out 2}.animate-fade-in{animation:fadeIn .3s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.flex-center{display:flex;align-items:center}.mr-1{margin-right:4px}.mt-4{margin-top:16px}