.dictation-app{max-width:1200px;margin:0 auto;padding:20px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:#1e293b;background-color:#f8fafc;min-height:100vh}.app-header{text-align:center;margin-bottom:24px;background:linear-gradient(135deg,#eff6ff,#dbeafe);padding:24px;border-radius:16px;box-shadow:0 4px 6px -1px #0000000d}.logo-area{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:8px}.icon-logo{color:#2563eb;width:32px;height:32px}.logo-area h1{font-size:28px;font-weight:800;color:#1e3a8a;margin:0}.badge{background-color:#3b82f6;color:#fff;font-size:12px;padding:4px 8px;border-radius:9999px;font-weight:700}.subtitle{color:#475569;font-size:15px;margin:0}.main-layout{display:grid;grid-template-columns:320px 1fr;gap:24px}@media (max-width: 768px){.main-layout{grid-template-columns:1fr}}.card{background:#fff;border-radius:16px;padding:20px;box-shadow:0 4px 6px -1px #0000000d,0 2px 4px -1px #0000000f;border:1px solid #f1f5f9}.sidebar{display:flex;flex-direction:column;gap:20px}.card-title{font-size:18px;color:#1e293b;margin-top:0;margin-bottom:16px;display:flex;justify-content:space-between;align-items:center;border-bottom:2px solid #f1f5f9;padding-bottom:8px}.word-scroll-list{max-height:300px;overflow-y:auto;margin-bottom:16px;border-radius:8px;border:1px solid #f1f5f9}.word-item{display:flex;justify-content:space-between;align-items:center;padding:12px;border-bottom:1px solid #f1f5f9;cursor:pointer;transition:all .2s}.word-item:hover{background-color:#f8fafc}.word-item.active{background-color:#eff6ff;border-left:4px solid #3b82f6}.word-info{display:flex;align-items:center;gap:12px}.word-index{font-size:12px;background-color:#e2e8f0;color:#64748b;width:20px;height:20px;border-radius:50%;display:flex;align-items:center;justify-content:center}.word-text{font-size:16px;font-weight:700;color:#1e293b;margin:0}.word-pinyin{font-size:12px;color:#64748b;margin:0}.btn-delete{background:none;border:none;color:#94a3b8;cursor:pointer;padding:4px;border-radius:4px;transition:all .2s}.btn-delete:hover{color:#ef4444;background-color:#fee2e2}.add-word-form{border-top:1px solid #f1f5f9;padding-top:16px}.add-word-form h3{font-size:14px;margin-top:0;margin-bottom:10px;color:#475569}.input-group{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}.input-group input{padding:8px 12px;border:1px solid #cbd5e1;border-radius:8px;font-size:14px;outline:none}.input-group input:focus{border-color:#3b82f6;box-shadow:0 0 0 2px #3b82f61a}.btn-add{width:100%;background-color:#3b82f6;color:#fff;border:none;padding:10px;border-radius:8px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;transition:background-color .2s}.btn-add:hover{background-color:#2563eb}.history-card{background-color:#fafafa}.history-tags{display:flex;flex-wrap:wrap;gap:8px}.history-tag{font-size:12px;padding:4px 8px;border-radius:6px;font-weight:500}.history-tag.correct{background-color:#dcfce7;color:#15803d}.history-tag.wrong{background-color:#fee2e2;color:#b91c1c}.empty-tip{font-size:13px;color:#94a3b8;text-align:center;margin:10px 0}.dictation-card{display:flex;flex-direction:column;align-items:center;min-height:500px}.progress-bar-container{width:100%;background-color:#f1f5f9;height:20px;border-radius:10px;position:relative;overflow:hidden;margin-bottom:24px}.progress-bar{background:linear-gradient(90deg,#3b82f6,#60a5fa);height:100%;transition:width .3s ease}.progress-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:11px;font-weight:700;color:#1e293b}.arena-header{text-align:center;margin-bottom:20px}.btn-primary{background:linear-gradient(135deg,#3b82f6,#1d4ed8);color:#fff;border:none;padding:14px 28px;border-radius:9999px;font-size:18px;font-weight:700;cursor:pointer;display:flex;align-items:center;gap:10px;box-shadow:0 4px 14px #3b82f666;transition:transform .2s,box-shadow .2s}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #3b82f680}.hint-text{font-size:13px;color:#64748b;margin-top:8px}.canvas-wrapper{position:relative;margin-bottom:24px;background-color:#fff;padding:10px;border-radius:12px;box-shadow:inset 0 2px 4px #0000000f}.writing-canvas{border:2px solid #cbd5e1;border-radius:8px;cursor:crosshair;background-color:#fffbfb;touch-action:none}.canvas-controls{display:flex;justify-content:center;margin-top:8px}.btn-secondary{background-color:#f1f5f9;color:#475569;border:1px solid #cbd5e1;padding:6px 16px;border-radius:6px;font-size:13px;cursor:pointer;display:flex;align-items:center;gap:6px;transition:all .2s}.btn-secondary:hover{background-color:#e2e8f0;color:#1e293b}.answer-section{width:100%;display:flex;justify-content:center;margin-bottom:24px}.btn-reveal{background-color:#fef3c7;color:#d97706;border:1px dashed #f59e0b;padding:12px 24px;border-radius:12px;font-size:15px;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:8px;transition:all .2s}.btn-reveal:hover{background-color:#fde68a}.reveal-box{width:100%;max-width:450px;background-color:#f8fafc;border:1px solid #e2e8f0;border-radius:12px;padding:16px;text-align:center}.reveal-word-card{margin-bottom:16px}.correct-word{font-size:36px;color:#1e3a8a;margin:0 0 4px;letter-spacing:4px}.correct-pinyin{font-size:16px;color:#2563eb;margin:0 0 8px;font-weight:500}.correct-def{font-size:14px;color:#64748b;margin:0}.judgment-buttons{display:flex;gap:12px;justify-content:center}.btn-judgment{flex:1;border:none;padding:10px 16px;border-radius:8px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;transition:transform .1s}.btn-judgment:active{transform:scale(.98)}.btn-judgment.wrong{background-color:#fee2e2;color:#ef4444}.btn-judgment.wrong:hover{background-color:#fecaca}.btn-judgment.correct{background-color:#dcfce7;color:#22c55e}.btn-judgment.correct:hover{background-color:#bbf7d0}.ai-assistant-box{width:100%;background:linear-gradient(135deg,#faf5ff,#f3e8ff);border:1px solid #e9d5ff;border-radius:12px;padding:16px}.ai-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.ai-title{display:flex;align-items:center;gap:8px;font-weight:700;color:#6b21a8}.ai-icon{color:#a855f7}.btn-ai-action{background-color:#a855f7;color:#fff;border:none;padding:6px 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