@import "https://fonts.googleapis.com/css2?family=Fredoka:wght@400;600;700&family=Quicksand:wght@500;600;700&family=Noto+Sans+SC:wght@500;700&display=swap";:root{--font-main:"Fredoka", "Quicksand", sans-serif;--font-chinese:"Noto Sans SC", sans-serif;--bg-gradient:linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 50%, #fae8ff 100%);--card-bg:#fff;--primary-color:#4f46e5;--primary-hover:#4338ca;--secondary-color:#06b6d4;--accent-yellow:#f59e0b;--accent-green:#10b981;--accent-pink:#ec4899;--accent-purple:#8b5cf6;--text-dark:#1e293b;--text-muted:#64748b;--radius-lg:24px;--radius-md:16px;--radius-sm:12px;--shadow-soft:0 10px 30px -5px #4f46e526, 0 4px 12px #0000000d;--shadow-card:0 20px 40px -10px #0000001f, 0 0 0 1px #fff9;--shadow-button:0 6px 16px #4f46e540}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background:var(--bg-gradient);color:var(--text-dark);-webkit-user-select:none;user-select:none;flex-direction:column;align-items:center;min-height:100vh;display:flex;overflow-x:hidden}#root{flex-direction:column;width:100%;max-width:800px;min-height:100vh;padding:20px;display:flex}.app-header{flex-direction:column;gap:16px;margin-bottom:24px;display:flex}.top-bar{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-radius:var(--radius-md);box-shadow:var(--shadow-soft);background:#ffffffd9;border:2px solid #ffffffe6;justify-content:space-between;align-items:center;padding:12px 20px;display:flex}.brand{color:#4338ca;align-items:center;gap:10px;font-size:1.4rem;font-weight:700;display:flex}.brand-icon{font-size:1.8rem;animation:2s ease-in-out infinite bounce}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}.mode-toggle-group{background:#f1f5f9;border:1px solid #cbd5e1;border-radius:20px;gap:4px;padding:4px;display:flex}.mode-btn{font-family:var(--font-main);color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:16px;align-items:center;gap:6px;padding:6px 14px;font-size:.85rem;font-weight:700;transition:all .2s;display:flex}.mode-btn.active{color:#4f46e5;background:#fff;box-shadow:0 2px 8px #00000014}.mode-btn.exam-mode-btn.active{color:#fff;background:linear-gradient(135deg,#ef4444 0%,#dc2626 100%);box-shadow:0 2px 8px #ef44444d}.mode-btn.speaking-mode-btn.active{color:#fff;background:linear-gradient(135deg,#06b6d4 0%,#0891b2 100%);box-shadow:0 2px 8px #06b6d44d}.progress-fill.exam-fill{background:linear-gradient(90deg,#f59e0b 0%,#ef4444 100%)}.progress-fill.speaking-fill{background:linear-gradient(90deg,#06b6d4 0%,#10b981 100%)}.card-top-badges{justify-content:space-between;align-items:center;width:100%;display:flex}.exam-mode-tag{color:#dc2626;background:#fee2e2;border:1px solid #fecaca;border-radius:12px;padding:4px 10px;font-size:.78rem;font-weight:700}.speaking-mode-tag{color:#0891b2;background:#ecfeff;border:1px solid #cff4fc;border-radius:12px;padding:4px 10px;font-size:.78rem;font-weight:700}.speaking-exam-console{justify-content:center;width:100%;margin-top:14px;display:flex}.speaking-exam-mic-btn{border-radius:var(--radius-md);color:#0891b2;width:100%;font-family:var(--font-main);cursor:pointer;background:linear-gradient(135deg,#ecfeff 0%,#cff4fc 100%);border:2px solid #06b6d4;justify-content:center;align-items:center;gap:12px;padding:16px;font-size:1.1rem;font-weight:700;transition:all .25s cubic-bezier(.4,0,.2,1);display:flex;box-shadow:0 6px 16px #06b6d433}.speaking-exam-mic-btn:hover{background:linear-gradient(135deg,#cff4fc 0%,#a5f3fc 100%);transform:translateY(-2px);box-shadow:0 8px 20px #06b6d44d}.speaking-exam-mic-btn.listening-now{color:#b91c1c;background:linear-gradient(135deg,#fee2e2 0%,#fecaca 100%);border-color:#ef4444;animation:1.2s infinite pulseBigMic}@keyframes pulseBigMic{0%{transform:scale(1)}50%{transform:scale(1.03)}to{transform:scale(1)}}.mic-icon-circle{background:#fff;border-radius:50%;justify-content:center;align-items:center;width:52px;height:52px;display:flex;box-shadow:0 4px 10px #0000001a}.exam-no-image-banner{border-radius:var(--radius-sm);color:#991b1b;background:#fef2f2;border:1.5px dashed #fca5a5;margin-bottom:6px;padding:10px 14px;font-size:.88rem;font-weight:700}.exam-must-repeat-box{color:#991b1b;border-radius:var(--radius-sm);background:#fee2e2;border:1px solid #fecaca;align-items:center;gap:8px;padding:10px 12px;font-size:.88rem;font-weight:700;display:flex}.retry-exam-btn{background:linear-gradient(135deg,#ef4444 0%,#dc2626 100%)!important;box-shadow:0 4px 14px #ef444459!important}.stat-badge{color:#d97706;background:#fef3c7;border:1.5px solid #fde68a;border-radius:20px;align-items:center;gap:6px;padding:6px 14px;font-size:.95rem;font-weight:700;display:flex;box-shadow:0 2px 6px #f59e0b26}.stat-badge.level-badge{color:#4338ca;background:#e0e7ff;border-color:#c7d2fe}.admin-toggle-btn{color:#fff;font-family:var(--font-main);cursor:pointer;background:#4f46e5;border:none;border-radius:20px;align-items:center;gap:6px;padding:8px 14px;font-size:.9rem;font-weight:700;transition:all .2s;display:flex;box-shadow:0 4px 10px #4f46e540}.admin-toggle-btn:hover{background:#4338ca;transform:translateY(-2px)}.grade-tabs-wrapper{width:100%;padding-bottom:4px;overflow-x:auto}.grade-tabs-wrapper::-webkit-scrollbar{height:4px}.grade-tabs-wrapper::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:4px}.grade-tabs{justify-content:center;gap:8px;min-width:max-content;display:flex}.tab-btn{border-radius:var(--radius-md);font-family:var(--font-main);cursor:pointer;color:var(--text-muted);white-space:nowrap;background:#fff9;border:none;justify-content:center;align-items:center;gap:6px;padding:10px 14px;font-size:.95rem;font-weight:700;transition:all .25s cubic-bezier(.4,0,.2,1);display:flex;box-shadow:inset 0 0 0 2px #fffc}.tab-btn:hover:not(.locked){background:#ffffffe6;transform:translateY(-2px)}.tab-btn.active{color:#fff;box-shadow:var(--shadow-button);background:linear-gradient(135deg,#6366f1 0%,#4f46e5 100%)}.tab-btn.locked{opacity:.6;cursor:not-allowed;background:#e2e8f0}.progress-container{background:#ffffffb3;border-radius:20px;align-items:center;gap:12px;padding:10px 16px;display:flex}.progress-track{background:#e2e8f0;border-radius:10px;flex:1;height:14px;position:relative;overflow:hidden}.progress-fill{background:linear-gradient(90deg,#10b981 0%,#34d399 100%);border-radius:10px;height:100%;transition:width .4s}.progress-text{color:var(--text-muted);font-size:.85rem;font-weight:700}.main-stage{perspective:1200px;flex-direction:column;flex:1;justify-content:center;align-items:center;margin-top:10px;display:flex}.flashcard-scene{perspective:1200px;width:100%;max-width:480px;height:460px;position:relative}.flashcard-card{width:100%;height:100%;transform-style:preserve-3d;transition:transform .7s cubic-bezier(.34,1.56,.64,1);position:relative}.flashcard-card.flipped{transform:rotateY(180deg)}.card-face{backface-visibility:hidden;border-radius:var(--radius-lg);background:var(--card-bg);width:100%;height:100%;box-shadow:var(--shadow-card);border:3px solid #fffc;flex-direction:column;justify-content:space-between;align-items:center;padding:24px;display:flex;position:absolute}.card-front{background:linear-gradient(#fff 0%,#f8fafc 100%)}.card-category-badge{color:#475569;letter-spacing:.5px;text-transform:uppercase;background:#f1f5f9;border-radius:12px;padding:4px 14px;font-size:.85rem;font-weight:700}.card-main-display{flex-direction:column;align-items:center;gap:8px;width:100%;margin-top:6px;display:flex}.card-emoji{filter:drop-shadow(0 4px 8px #0000001a);font-size:3.2rem}.card-hanzi{font-family:var(--font-chinese);color:#1e1b4b;text-shadow:0 2px 4px #0000000d;font-size:4.4rem;font-weight:700;line-height:1.1}.card-pinyin-row{align-items:center;gap:10px;display:flex}.card-pinyin{color:#6366f1;font-size:1.5rem;font-weight:600}.audio-btn{color:#4338ca;cursor:pointer;background:#e0e7ff;border:none;border-radius:50%;justify-content:center;align-items:center;width:44px;height:44px;transition:all .2s;display:flex;box-shadow:0 4px 10px #6366f133}.audio-btn:hover{background:#c7d2fe;transform:scale(1.08)}.audio-btn:active{transform:scale(.95)}.audio-btn.mic-active{animation:1.2s infinite pulseMic;box-shadow:0 0 0 4px #ef44444d}@keyframes pulseMic{0%{transform:scale(1)}50%{transform:scale(1.12)}to{transform:scale(1)}}.speech-feedback-box{text-align:center;border-radius:12px;max-width:90%;margin-top:6px;padding:6px 12px;font-size:.85rem;font-weight:600}.speech-feedback-box.listening{color:#b45309;background:#fef3c7;border:1px solid #fde68a;animation:1.5s infinite pulseMsg}.speech-feedback-box.success{color:#15803d;background:#dcfce7;border:1px solid #bbf7d0}.speech-feedback-box.fail{color:#b91c1c;background:#fee2e2;border:1px solid #fecaca}@keyframes pulseMsg{0%,to{opacity:.8}50%{opacity:1}}.choices-grid{grid-template-columns:1fr 1fr;gap:12px;width:100%;margin-top:10px;display:grid}.choice-btn{border-radius:var(--radius-md);font-family:var(--font-main);color:#334155;cursor:pointer;text-align:center;background:#f8fafc;border:2px solid #e2e8f0;justify-content:center;align-items:center;padding:12px 8px;font-size:1.02rem;font-weight:700;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex;box-shadow:0 4px 6px -1px 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12px}.breakdown-title{color:#64748b;text-transform:uppercase;margin-bottom:4px;font-size:.8rem;font-weight:700}.breakdown-list{flex-direction:column;gap:4px;display:flex}.breakdown-item{align-items:center;gap:8px;font-size:.9rem;display:flex}.char-badge{font-family:var(--font-chinese);color:#0f172a;background:#e2e8f0;border-radius:6px;padding:2px 8px;font-weight:700}.example-box{border-radius:var(--radius-sm);background:#eff6ff;border:1px solid #bfdbfe;padding:8px 12px}.example-title{color:#2563eb;margin-bottom:2px;font-size:.78rem;font-weight:700}.example-hanzi{font-family:var(--font-chinese);color:#1e3a8a;font-size:1rem;font-weight:700}.example-pinyin{color:#3b82f6;font-size:.82rem;font-style:italic}.example-english{color:#475569;margin-top:2px;font-size:.82rem}.next-btn{border-radius:var(--radius-md);color:#fff;width:100%;font-family:var(--font-main);cursor:pointer;background:linear-gradient(135deg,#10b981 0%,#059669 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solid #e2e8f0;justify-content:space-between;align-items:center;padding:20px 24px;display:flex}.admin-title-group{align-items:center;gap:16px;display:flex}.admin-logo{color:#1e1b4b;align-items:center;gap:10px;font-size:1.3rem;font-weight:700;display:flex}.admin-date-badge{color:#2563eb;background:#eff6ff;border:1px solid #bfdbfe;border-radius:12px;align-items:center;gap:6px;padding:6px 12px;font-size:.85rem;font-weight:700;display:flex}.close-admin-btn{cursor:pointer;color:#64748b;background:#f1f5f9;border:none;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;transition:all .2s;display:flex}.close-admin-btn:hover{color:#ef4444;background:#fee2e2}.admin-stats-bar{background:#fff;border-bottom:1px solid #f1f5f9;grid-template-columns:repeat(4,1fr);gap:12px;padding:16px 24px;display:grid}.stat-card{border-radius:var(--radius-sm);background:#f8fafc;border:1px solid #e2e8f0;flex-direction:column;padding:12px 16px;display:flex}.stat-label{color:var(--text-muted);text-transform:uppercase;font-size:.78rem;font-weight:700}.stat-val{color:#4f46e5;margin-top:2px;font-size:1.4rem;font-weight:700}.admin-nav-tabs{background:#fff;border-bottom:2px solid #e2e8f0;gap:8px;padding:12px 24px 0;display:flex}.admin-nav-btn{font-family:var(--font-main);color:#64748b;cursor:pointer;background:0 0;border:none;border-bottom:3px solid #0000;align-items:center;gap:8px;padding:10px 18px;font-size:.95rem;font-weight:700;transition:all .2s;display:flex}.admin-nav-btn:hover{color:#4f46e5}.admin-nav-btn.active{color:#4f46e5;border-bottom-color:#4f46e5}.admin-tab-content{flex:1;padding:20px 24px;overflow-y:auto}.admin-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;display:flex}.search-box{border-radius:var(--radius-sm);background:#f8fafc;border:1.5px solid #cbd5e1;flex:1;align-items:center;gap:8px;min-width:220px;padding:8px 14px;display:flex}.search-box input{font-family:var(--font-main);background:0 0;border:none;outline:none;width:100%;font-size:.95rem}.filter-group{align-items:center;gap:10px;display:flex}.filter-item{border-radius:var(--radius-sm);background:#f8fafc;border:1.5px solid #cbd5e1;align-items:center;gap:6px;padding:6px 12px;font-size:.85rem;display:flex}.filter-item select,.filter-item input{font-family:var(--font-main);color:#334155;background:0 0;border:none;outline:none;font-size:.88rem;font-weight:600}.date-filter{position:relative}.clear-date-btn{color:#94a3b8;cursor:pointer;background:0 0;border:none;padding:0 4px;font-size:1rem}.toolbar-actions{gap:10px;display:flex}.add-card-btn{color:#fff;border-radius:var(--radius-sm);font-family:var(--font-main);cursor:pointer;background:linear-gradient(135deg,#10b981 0%,#059669 100%);border:none;align-items:center;gap:6px;padding:10px 16px;font-size:.9rem;font-weight:700;transition:all .2s;display:flex;box-shadow:0 4px 12px #10b98140}.add-card-btn:hover{transform:translateY(-2px)}.reset-db-btn{color:#475569;border-radius:var(--radius-sm);font-family:var(--font-main);cursor:pointer;background:#f1f5f9;border:1px solid #cbd5e1;align-items:center;gap:6px;padding:10px 14px;font-size:.85rem;font-weight:700;display:flex}.reset-db-btn:hover{background:#e2e8f0}.table-responsive{border-radius:var(--radius-sm);border:1px solid #e2e8f0;width:100%;overflow-x:auto}.admin-table{border-collapse:collapse;text-align:left;width:100%;font-size:.9rem}.admin-table th{color:#475569;white-space:nowrap;background:#f8fafc;border-bottom:2px solid #e2e8f0;padding:12px 14px;font-weight:700}.admin-table td{color:#334155;border-bottom:1px solid #f1f5f9;padding:12px 14px}.admin-table tr:hover{background:#f8fafc}.cell-emoji{font-size:1.4rem}.cell-hanzi{font-family:var(--font-chinese);color:#1e1b4b;font-size:1.2rem;font-weight:700}.cell-pinyin{color:#6366f1;font-weight:600}.grade-tag{white-space:nowrap;border-radius:12px;padding:4px 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p{color:var(--text-muted);font-size:.9rem}.sheets-form{flex-direction:column;gap:12px;display:flex}.input-with-btn{align-items:center;gap:10px;display:flex;position:relative}.input-with-btn .input-icon{color:#94a3b8;position:absolute;left:12px}.input-with-btn input{border-radius:var(--radius-sm);font-family:var(--font-main);border:1.5px solid #cbd5e1;outline:none;flex:1;padding:12px 14px 12px 40px;font-size:.95rem}.input-with-btn input:focus{border-color:#059669;box-shadow:0 0 0 3px #05966926}.sync-btn{color:#fff;border-radius:var(--radius-sm);font-family:var(--font-main);cursor:pointer;white-space:nowrap;background:linear-gradient(135deg,#059669 0%,#047857 100%);border:none;align-items:center;gap:8px;padding:12px 20px;font-size:.95rem;font-weight:700;display:flex;box-shadow:0 4px 12px #05966940}.open-sheet-link{color:#059669;align-items:center;gap:6px;font-size:.9rem;font-weight:700;text-decoration:none;display:inline-flex}.csv-upload-action-box{border-radius:var(--radius-md);background:#f0fdf4;border:1.5px dashed #86efac;margin-top:4px;padding:16px}.csv-upload-action-box h4{color:#14532d;margin-bottom:10px;font-size:.98rem}.upload-buttons-row{flex-wrap:wrap;gap:12px;display:flex}.upload-seed-btn{color:#fff;border-radius:var(--radius-sm);font-family:var(--font-main);cursor:pointer;background:linear-gradient(135deg,#16a34a 0%,#15803d 100%);border:none;align-items:center;gap:8px;padding:12px 18px;font-size:.92rem;font-weight:700;transition:all .2s;display:inline-flex;box-shadow:0 4px 12px #16a34a40}.upload-seed-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 16px #16a34a59}.upload-seed-btn:disabled{opacity:.6;cursor:not-allowed}.custom-csv-upload-label{color:#047857;border-radius:var(--radius-sm);font-family:var(--font-main);cursor:pointer;background:#fff;border:2px solid #059669;align-items:center;gap:8px;padding:10px 18px;font-size:.9rem;font-weight:700;transition:all .2s;display:inline-flex}.custom-csv-upload-label:hover:not(.disabled){background:#ecfdf5}.custom-csv-upload-label.disabled{opacity:.5;cursor:not-allowed}.sync-status-box{border-radius:var(--radius-sm);padding:12px 16px;font-size:.92rem;font-weight:700}.sync-status-box.success{color:#15803d;background:#dcfce7;border:1px solid #bbf7d0}.sync-status-box.error{color:#b91c1c;background:#fee2e2;border:1px solid #fecaca}.sheets-instruction-card{border-radius:var(--radius-md);background:#f8fafc;border:1px solid #e2e8f0;padding:20px}.sheets-instruction-card h4{color:#1e1b4b;margin-bottom:10px;font-size:1rem}.sheets-instruction-card ol{color:#475569;flex-direction:column;gap:8px;padding-left:20px;font-size:.9rem;line-height:1.5;display:flex}.sheets-instruction-card code{word-break:break-all;background:#e2e8f0;border-radius:4px;padding:2px 6px;font-size:.8rem}.copy-code-btn{color:#fff;border-radius:var(--radius-sm);font-family:var(--font-main);cursor:pointer;background:#0284c7;border:none;align-items:center;gap:6px;padding:8px 14px;font-size:.85rem;font-weight:700;transition:all .2s;display:inline-flex;box-shadow:0 4px 10px #0284c733}.copy-code-btn:hover{background:#0369a1}.download-seed-box{border-top:1px dashed #cbd5e1;margin-top:16px;padding-top:14px}.download-csv-btn{color:#4338ca;border-radius:var(--radius-sm);background:#e0e7ff;align-items:center;gap:8px;padding:10px 16px;font-size:.88rem;font-weight:700;text-decoration:none;transition:all .2s;display:inline-flex}.download-csv-btn:hover{background:#c7d2fe}.loading-banner{color:#2563eb;background:#eff6ff;border:1px solid #bfdbfe;border-radius:20px;margin-bottom:14px;padding:10px 16px;font-size:.9rem;font-weight:700}.spin-icon{animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.no-cards-box{border-radius:var(--radius-lg);text-align:center;box-shadow:var(--shadow-card);background:#fff;flex-direction:column;align-items:center;gap:12px;width:100%;max-width:440px;padding:40px 24px;display:flex}.no-cards-box h3{color:#1e1b4b;font-size:1.4rem}.no-cards-box p{color:var(--text-muted);font-size:.95rem}@media (width<=700px){.admin-stats-bar{grid-template-columns:1fr 1fr}.history-summary-box,.form-row.grid-2,.form-row.grid-3{grid-template-columns:1fr}}