:root{--primary: #4F46E5;--primary-dark: #3730A3;--primary-light: #EEF2FF;--secondary: #10B981;--secondary-dark: #059669;--warning: #F59E0B;--danger: #EF4444;--purple: #8B5CF6;--bg: #F0F4F8;--card: #FFFFFF;--text: #1F2937}*{box-sizing:border-box;font-family:Segoe UI,system-ui,-apple-system,BlinkMacSystemFont,Roboto,sans-serif;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent}body{background-color:var(--bg);color:var(--text);margin:0;padding:12px;display:flex;justify-content:center;align-items:center;min-height:100vh}.app-container{background:var(--card);width:100%;max-width:460px;border-radius:24px;box-shadow:0 12px 30px #4f46e51f;padding:20px;text-align:center;position:relative;overflow:hidden}#confetti-canvas{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:100}h1{color:var(--primary);margin:4px 0 6px;font-size:24px}p.subtitle{color:#6b7280;margin-top:0;margin-bottom:16px;font-size:13px}.section-label{text-align:left;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:#6b7280;margin:14px 0 8px}.level-card{background:#fafafa;border:2px solid #E5E7EB;border-radius:16px;padding:12px 14px;margin-bottom:10px;cursor:pointer;transition:all .18s ease;text-align:left;display:flex;align-items:center;gap:12px}.level-card:hover,.level-card:active{border-color:var(--primary);background:var(--primary-light);transform:translateY(-2px)}.level-icon{font-size:26px;min-width:36px;text-align:center}.level-title{font-weight:700;font-size:15px;color:var(--primary-dark);margin-bottom:2px}.level-desc{font-size:12px;color:#4b5563;line-height:1.35}.card-speedrun{border-color:#fcd34d;background:#fffbeb}.card-speedrun:hover,.card-speedrun:active{border-color:var(--warning);background:#fef3c7}.card-speedrun .level-title{color:#b45309}.top-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font-size:13px;font-weight:600}.btn-top{background:#f3f4f6;border:none;border-radius:10px;padding:6px 10px;font-size:13px;cursor:pointer;color:#4b5563;font-weight:600;transition:all .15s}.btn-top:active{background:#e5e7eb}.badge-streak{background:#fef3c7;color:#d97706;padding:5px 10px;border-radius:14px;font-size:13px;font-weight:700}.timer-badge{background:#fee2e2;color:#dc2626;padding:5px 11px;border-radius:14px;font-size:13px;font-weight:800;letter-spacing:.3px;display:inline-flex;align-items:center;border:1px solid #FECACA}.timer-badge.urgent{background:#ef4444;color:#fff;border-color:#b91c1c;animation:timerPulse .6s infinite alternate}.score-badge{background:#dcfce7;color:#15803d;padding:5px 10px;border-radius:14px;font-size:13px;font-weight:800;display:inline-flex;align-items:center;border:1px solid #BBF7D0}@keyframes timerPulse{0%{transform:scale(1)}to{transform:scale(1.06)}}.progress-bar{width:100%;height:8px;background:#e5e7eb;border-radius:4px;margin-bottom:12px;overflow:hidden}.progress-fill{height:100%;background:var(--secondary);width:0%;transition:width .3s ease}.question-box{background:var(--primary-light);border-radius:18px;padding:16px 14px;margin-bottom:10px;border:2px solid #C7D2FE;position:relative}.type-badge{display:inline-block;font-size:11px;font-weight:700;padding:3px 10px;border-radius:12px;margin-bottom:8px;text-transform:uppercase;letter-spacing:.4px}.badge-standard{background:#e0e7ff;color:#4338ca}.badge-missing{background:#ede9fe;color:#6d28d9}.badge-story{background:#fef3c7;color:#b45309}.badge-multiple{background:#d1fae5;color:#065f46}.badge-fraction{background:#f3e8ff;color:#7e22ce}.retry-badge{background:#fee2e2;color:#dc2626}.question-text{font-size:38px;font-weight:800;color:var(--primary-dark);letter-spacing:1px;margin:4px 0 8px;line-height:1.15}.question-story{font-size:16px;font-weight:600;color:#1f2937;background:#fff;border:1px solid #C7D2FE;border-radius:14px;padding:13px 15px;line-height:1.5;text-align:center;margin:6px 0 12px;box-shadow:0 2px 4px #4f46e50a}.math-equation{display:flex;align-items:center;justify-content:center;font-size:24px;font-weight:800;color:var(--primary-dark);margin:8px 0;gap:6px;flex-wrap:wrap}.math-op{font-size:22px;margin:0 3px;color:var(--primary);font-weight:800}.math-fraction{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;font-size:20px;line-height:1.15;margin:0 4px;-webkit-user-select:none;user-select:none}.math-fraction .numerator{border-bottom:2.5px solid currentColor;padding:0 4px 2px;font-weight:800;display:block;min-width:16px}.math-fraction .denominator{padding:2px 4px 0;font-weight:800;display:block;min-width:16px}.answer-display{display:inline-block;min-width:88px;height:52px;line-height:46px;background:#fff;border:3px solid var(--primary);border-radius:14px;font-size:30px;font-weight:700;color:var(--text);padding:0 15px;box-shadow:0 3px 8px #4f46e514;margin-top:4px}.feedback-box{min-height:52px;margin-bottom:10px;display:flex;align-items:center;justify-content:center;flex-direction:column}.hint-btn{background:#fef3c7;color:#b45309;border:1px solid #FCD34D;padding:6px 14px;border-radius:14px;font-size:12px;font-weight:600;cursor:pointer;transition:all .15s}.hint-btn:active{transform:scale(.97)}.hint-text{background:#fffbeb;border:1px dashed #F59E0B;color:#92400e;padding:8px 10px;border-radius:10px;font-size:12px;line-height:1.4;width:100%}.feedback-msg{font-weight:700;font-size:14px;padding:8px 10px;border-radius:10px;width:100%;line-height:1.4}.msg-correct{background:#d1fae5;color:#065f46}.msg-wrong{background:#fee2e2;color:#991b1b}.keypad{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.key-btn{background:#f9fafb;border:1px solid #E5E7EB;border-bottom:4px solid #D1D5DB;border-radius:12px;padding:13px 0;font-size:21px;font-weight:700;color:var(--text);cursor:pointer;transition:all .1s}.key-btn:active{transform:translateY(2px);border-bottom-width:2px;background:#f3f4f6}.key-clear{background:#fee2e2;color:#dc2626;border-color:#fecaca;border-bottom-color:#fca5a5;font-size:16px}.key-submit{background:var(--secondary);color:#fff;border-color:var(--secondary-dark);border-bottom-color:#047857;font-size:17px}.key-submit:active{background:var(--secondary-dark)}.key-next{grid-column:span 3;background:var(--primary);color:#fff;border-bottom-color:var(--primary-dark);padding:15px;font-size:17px;display:none}.report-list{text-align:left;max-height:230px;overflow-y:auto;margin:12px 0;border:1px solid #E5E7EB;border-radius:12px;padding:8px;background:#fafafa}.report-item{display:flex;justify-content:space-between;align-items:center;padding:7px 8px;border-bottom:1px solid #F3F4F6;font-size:13px}.report-item:last-child{border-bottom:none}.tag-ok{color:#059669;font-weight:700}.tag-retry{color:#d97706;font-weight:700}.btn-primary{background:var(--primary);color:#fff;border:none;padding:13px 20px;border-radius:12px;font-size:15px;font-weight:700;width:100%;cursor:pointer;margin-top:8px;transition:background .15s}.btn-primary:active{background:var(--primary-dark)}.btn-secondary{background:#f3f4f6;color:#4b5563;border:1px solid #D1D5DB;padding:11px 20px;border-radius:12px;font-size:14px;font-weight:600;width:100%;cursor:pointer;margin-top:6px}.screen{display:none}.screen.active{display:block}.modal-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#0f172a85;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:16px;z-index:250;animation:modalFadeIn .18s ease-out}.modal-card{background:#fff;border-radius:20px;padding:22px 18px;width:100%;max-width:330px;box-shadow:0 20px 40px #0003;text-align:center;animation:modalPopIn .22s cubic-bezier(.175,.885,.32,1.275)}.modal-icon{font-size:34px;margin-bottom:6px;line-height:1}.modal-title{font-size:17px;font-weight:800;color:#1f2937;margin-bottom:6px}.modal-desc{font-size:13px;color:#6b7280;line-height:1.4;margin:0 0 18px}.modal-actions{display:flex;gap:8px}.btn-modal-cancel{flex:1.2;background:var(--primary);color:#fff;border:none;padding:11px 14px;border-radius:12px;font-size:14px;font-weight:700;cursor:pointer;transition:background .15s,transform .1s}.btn-modal-cancel:hover{background:var(--primary-dark)}.btn-modal-cancel:active{transform:scale(.97)}.btn-modal-confirm{flex:1;background:#fee2e2;color:#dc2626;border:1px solid #FECACA;padding:11px 14px;border-radius:12px;font-size:13px;font-weight:700;cursor:pointer;transition:background .15s,transform .1s}.btn-modal-confirm:hover{background:#fca5a5}.btn-modal-confirm:active{transform:scale(.97)}@keyframes modalFadeIn{0%{opacity:0}to{opacity:1}}@keyframes modalPopIn{0%{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}