:root { 
            --accent-color: #01497c;
            --light-gray: #f8f9fa;
            --border-color: #eaeaea;
            --text-color: #333;
            --text-muted: #6c757d;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --medical-red: #dc3545;
            --medical-green: #198754;
            --medical-yellow: #ffc107;
            --medical-orange: #fd7e14;
            --sleep-blue: #4a6fa5;
            --sleep-purple: #6d5b97;
            --sleep-teal: #17a2b8;
        }
         
        .night-mode .tool-card,
        .night-mode .summary-card,
        .night-mode .bsa-method-card,
        .night-mode .application-card,
        .night-mode .sleep-time-option,
        .night-mode .sleep-phase-card,
        .night-mode .sleep-tip-card,
        .night-mode .sleep-stage-card,
        .night-mode .related-tools,
        .night-mode .ad-container,
        .night-mode .info-box,
        .night-mode .medical-info-box,
        .night-mode .dosage-calculator,
        .night-mode .bsa-formula-box {
            background-color: #2d2d44 !important;
            border-color: #3d3d5c !important;
            color: #e6e6e6 !important;
        }
        
        .night-mode .section-title,
        .night-mode .related-title,
        .night-mode .result-title,
        .night-mode .formula-title {
            color: #a9d6e5 !important;
        }
        
        .night-mode .form-control,
        .night-mode .input-group-text {
            background-color: #2d2d44;
            border-color: #3d3d5c;
            color: #e6e6e6;
        }
        
        .night-mode .form-control:focus {
            background-color: #2d2d44;
            border-color: var(--primary-color);
            color: #e6e6e6;
        }
         
        .night-mode .navbar {
            background-color: #2d2d44;
            border-bottom-color: #3d3d5c;
        }
        
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color);
            font-size: 1.5rem;
        }
        
        .nav-link {
            color: #555;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: 6px;
            transition: all 0.3s;
        }
        
        .night-mode .nav-link {
            color: #b0b0b0;
        }
        
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color);
            background-color: rgba(44, 125, 160, 0.1);
        }
        
        .night-mode .nav-link:hover, .night-mode .nav-link.active {
            color: #a9d6e5;
            background-color: rgba(169, 214, 229, 0.1);
        }
 
        .night-mode .page-header {
            background: linear-gradient(135deg, rgba(74, 111, 165, 0.4) 0%, rgba(109, 91, 151, 0.4) 100%);
            border-bottom-color: rgba(109, 91, 151, 0.3);
        }
         
        .night-mode .page-header::before {
            background-image: radial-gradient(rgba(255,255,255,0.3) 1px, transparent 1px);
        }
        
        .breadcrumb {
            background-color: transparent;
            padding: 0.5rem 0;
            margin-bottom: 0.5rem;
        }
        
        .breadcrumb-item a {
            color: var(--text-muted);
            text-decoration: none;
        }
        
        .night-mode .breadcrumb-item a {
            color: #a0a0a0;
        }
        
        .breadcrumb-item.active {
            color: var(--text-color);
        }
        
        .night-mode .breadcrumb-item.active {
            color: #e6e6e6;
        }
          
        .night-mode .tool-header {
            border-bottom-color: #3d3d5c;
        }
          
        .night-mode .tool-header h2 {
            color: #a9d6e5;
        }
         
        .night-mode .form-label {
            color: #e6e6e6;
        }
        
        .form-control {
            border: 1px solid #ddd;
            border-radius: 6px;
            padding: 0.75rem;
            transition: all 0.3s;
        }
         
        .night-mode .input-group-text {
            background-color: #3d3d5c;
            border-color: #4d4d6c;
            color: #e6e6e6;
        }
         
        
        .night-mode .result-container {
            background-color: #2d2d44;
            border-color: #3d3d5c;
        }
        
        .result-title {
            font-weight: 600;
            margin-bottom: 0.75rem;
            color: var(--primary-color);
        }
        
        .night-mode .result-title {
            color: #a9d6e5;
        }
         
        .night-mode .summary-value {
            color: #a9d6e5;
        }
        
        .summary-label {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        .night-mode .summary-label {
            color: #a0a0a0;
        }
        
        /* BSA Comparison Grid */
        .bsa-comparison-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        
        .bsa-method-card {
            background: white;
            border-radius: 8px;
            padding: 1.25rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            text-align: center;
            transition: all 0.3s;
        }
        
        .bsa-method-card.active {
            border: 2px solid var(--primary-color);
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .night-mode .bsa-method-card.active {
            border-color: #a9d6e5;
            background-color: rgba(169, 214, 229, 0.1);
        }
        
        .bsa-method-name {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-color);
        }
        
        .night-mode .bsa-method-name {
            color: #e6e6e6;
        }
        
        .bsa-method-value {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        
        .night-mode .bsa-method-value {
            color: #a9d6e5;
        }
        
        .bsa-method-desc {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
        }
        
        .night-mode .bsa-method-desc {
            color: #a0a0a0;
        }
         
        
        .night-mode .info-box {
            background-color: rgba(44, 125, 160, 0.1);
            border-left-color: #a9d6e5;
        }
        
        .medical-info-box {
            background-color: rgba(220, 53, 69, 0.05);
            border-left: 3px solid var(--medical-red);
            padding: 1rem;
            border-radius: 0 4px 4px 0;
            margin: 1.5rem 0;
            transition: all 0.3s;
        }
        
        .night-mode .medical-info-box {
            background-color: rgba(220, 53, 69, 0.1);
            border-left-color: #ff6b6b;
        }
         
        .night-mode .related-tool {
            border-bottom-color: #3d3d5c;
        }
        
        .related-tool:hover {
            background-color: var(--light-gray);
        }
        
        .night-mode .related-tool:hover {
            background-color: #3d3d5c;
        }
        
        .related-tool:last-child {
            border-bottom: none;
        }
         
        .night-mode .related-icon {
            background-color: rgba(169, 214, 229, 0.2);
            color: #a9d6e5;
        }
        
        .related-name {
            font-weight: 500;
            margin-bottom: 0.25rem;
        }
        
        .night-mode .related-name {
            color: #e6e6e6;
        }
         
        .night-mode .ad-placeholder {
            background-color: #2d2d44;
            border-color: #3d3d5c;
            color: #a0a0a0;
        }
        
        .night-mode .footer {
            background-color: #2d2d44;
            border-top-color: #3d3d5c;
            color: #e6e6e6;
        }
        
        .night-mode .footer h4,
        .night-mode .footer h5 {
            color: #a9d6e5;
        }
        
        .night-mode .footer .text-muted {
            color: #a0a0a0 !important;
        }
        
        /* Responsive Adjustments */
        @media (max-width: 768px) {
            .tool-card {
                padding: 1.5rem;
            }
            
            .bsa-comparison-grid {
                grid-template-columns: 1fr;
            }
            
            .chart-container {
                height: 300px;
            }
        }
        
        /* Measurement System Toggle */
        .measurement-system {
            display: flex;
            background-color: var(--light-gray);
            border-radius: 6px;
            padding: 4px;
            margin-bottom: 1.5rem;
            transition: all 0.3s;
        }
        
        .night-mode .measurement-system {
            background-color: #3d3d5c;
        }
        
        .system-btn {
            flex: 1;
            text-align: center;
            padding: 0.75rem;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 600;
        }
        
        .night-mode .system-btn {
            color: #b0b0b0;
        }
        
        .system-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        .night-mode .system-btn.active {
            background-color: #a9d6e5;
            color: #1a1a2e;
        }
        
        /* Toast notifications */
        .toast-container {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 1050;
        }
        
        /* Action buttons */
        .action-btn {
            background-color: white;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 0.5rem 1rem;
            margin-left: 0.5rem;
            transition: all 0.3s;
            color: var(--text-color);
        }
        
        .night-mode .action-btn {
            background-color: #2d2d44;
            border-color: #3d3d5c;
            color: #e6e6e6;
        }
        
        .action-btn:hover {
            background-color: var(--light-gray);
            color: var(--primary-color);
        }
        
        .night-mode .action-btn:hover {
            background-color: #3d3d5c;
            color: #a9d6e5;
        }
        
        /* Input group styling */
        .input-group {
            margin-bottom: 1rem;
        }
        
        /* Reference table */
        .reference-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
        }
        
        .reference-table th, .reference-table td {
            padding: 0.75rem;
            text-align: left;
            border: 1px solid var(--border-color);
        }
        
        .night-mode .reference-table th, 
        .night-mode .reference-table td {
            border-color: #3d3d5c;
        }
        
        .reference-table th {
            background-color: var(--light-gray);
            font-weight: 600;
        }
        
        .night-mode .reference-table th {
            background-color: #3d3d5c;
            color: #e6e6e6;
        }
        
        .reference-table tr:nth-child(even) {
            background-color: rgba(44, 125, 160, 0.05);
        }
        
        .night-mode .reference-table tr:nth-child(even) {
            background-color: rgba(169, 214, 229, 0.1);
        }
        
        .night-mode .reference-table {
            color: #e6e6e6;
        }
        
        .generating-indicator {
            display: none;
            text-align: center;
            padding: 1rem;
            color: var(--text-muted);
        }
        
        .night-mode .generating-indicator {
            color: #a0a0a0;
        }
        
        /* BSA-specific styles */
        .bsa-formula-box {
            background-color: rgba(44, 125, 160, 0.05);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border: 1px solid rgba(44, 125, 160, 0.2);
            transition: all 0.3s;
        }
        
        .night-mode .bsa-formula-box {
            background-color: rgba(44, 125, 160, 0.1);
            border-color: rgba(169, 214, 229, 0.3);
        }
        
        .formula-text {
            font-family: 'Courier New', monospace;
            font-size: 1.1rem;
            color: var(--accent-color);
            margin-bottom: 0.5rem;
        }
        
        .night-mode .formula-text {
            color: #a9d6e5;
        }
        
        .formula-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-color);
        }
        
        .night-mode .formula-title {
            color: #a9d6e5;
        }
        
        .bsa-applications {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        
        .application-card {
            background: white;
            border-radius: 8px;
            padding: 1.25rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        
        .application-icon {
            width: 48px;
            height: 48px;
            border-radius: 8px;
            background-color: rgba(44, 125, 160, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1rem;
            color: var(--primary-color);
            font-size: 1.25rem;
            transition: all 0.3s;
        }
        
        .night-mode .application-icon {
            background-color: rgba(169, 214, 229, 0.2);
            color: #a9d6e5;
        }
        
        .application-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-color);
        }
        
        .night-mode .application-title {
            color: #e6e6e6;
        }
        
        .application-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        .night-mode .application-desc {
            color: #a0a0a0;
        }
        
        /* Age category indicators */
        .age-category {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-right: 0.5rem;
        }
        
        .age-child {
            background-color: rgba(40, 167, 69, 0.1);
            color: #28a745;
        }
        
        .age-adult {
            background-color: rgba(0, 123, 255, 0.1);
            color: #007bff;
        }
        
        .age-elderly {
            background-color: rgba(108, 117, 125, 0.1);
            color: #6c757d;
        }
        
        /* Range slider styling */
        .form-range {
            width: 100%;
            height: 1rem;
            padding: 0;
            background-color: transparent;
            -webkit-appearance: none;
        }
        
        .form-range:focus {
            outline: none;
        }
        
        .form-range::-webkit-slider-thumb {
            width: 1rem;
            height: 1rem;
            margin-top: -0.5rem;
            background-color: var(--primary-color);
            border: 0;
            border-radius: 1rem;
            -webkit-appearance: none;
        }
        
        .night-mode .form-range::-webkit-slider-thumb {
            background-color: #a9d6e5;
        }
        
        .form-range::-webkit-slider-runnable-track {
            width: 100%;
            height: 0.5rem;
            cursor: pointer;
            animate: 0.2s;
            background: var(--light-gray);
            border-radius: 0.5rem;
        }
        
        .night-mode .form-range::-webkit-slider-runnable-track {
            background: #3d3d5c;
        }
        
        .slider-value {
            background-color: var(--primary-color);
            color: white;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-size: 0.8rem;
            margin-left: 0.5rem;
        }
        
        .night-mode .slider-value {
            background-color: #a9d6e5;
            color: #1a1a2e;
        }
        
        /* BSA chart styling */
        .bsa-chart-container {
            position: relative;
            height: 350px;
            width: 100%;
            margin: 1.5rem 0;
        }
        
        /* BSA classification */
        .bsa-classification {
            padding: 1rem;
            border-radius: 8px;
            margin: 1rem 0;
            border-left: 5px solid;
        }
        
        .bsa-low {
            background-color: rgba(255, 193, 7, 0.1);
            border-left-color: var(--medical-yellow);
        }
        
        .bsa-normal {
            background-color: rgba(40, 167, 69, 0.1);
            border-left-color: var(--medical-green);
        }
        
        .bsa-high {
            background-color: rgba(220, 53, 69, 0.1);
            border-left-color: var(--medical-red);
        }
        
        /* Drug dosage calculator */
        .dosage-calculator {
            background-color: rgba(44, 125, 160, 0.05);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border: 1px solid rgba(44, 125, 160, 0.2);
            transition: all 0.3s;
        }
        
        .night-mode .dosage-calculator {
            background-color: rgba(44, 125, 160, 0.1);
            border-color: rgba(169, 214, 229, 0.3);
        }
        
        /* 睡眠计算器特定样式 */
        .sleep-phase-card {
            background: white;
            border-radius: 8px;
            padding: 1rem;
            border: 1px solid var(--border-color);
            margin-bottom: 1rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        
        .sleep-phase-card.active {
            border: 2px solid var(--sleep-purple);
            background-color: rgba(109, 91, 151, 0.05);
        }
        
        .night-mode .sleep-phase-card.active {
            border-color: #a9d6e5;
            background-color: rgba(169, 214, 229, 0.1);
        }
        
        .sleep-phase-indicator {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            margin-right: 0.75rem;
        }
        
        .sleep-phase-light {
            background-color: #e9ecef;
        }
        
        .sleep-phase-deep {
            background-color: var(--sleep-blue);
        }
        
        .sleep-phase-rem {
            background-color: var(--sleep-purple);
        }
        
        .sleep-cycle-visual {
            height: 80px;
            width: 100%;
            background: linear-gradient(90deg, #e9ecef 25%, #4a6fa5 25%, #4a6fa5 50%, #6d5b97 50%, #6d5b97 75%, #e9ecef 75%);
            border-radius: 4px;
            margin: 1rem 0;
            position: relative;
            transition: all 0.3s;
        }
        
        .night-mode .sleep-cycle-visual {
            background: linear-gradient(90deg, #3d3d5c 25%, #4a6fa5 25%, #4a6fa5 50%, #6d5b97 50%, #6d5b97 75%, #3d3d5c 75%);
        }
        
        .sleep-timeline {
            position: relative;
            height: 100px;
            margin: 2rem 0;
            border-left: 2px solid var(--border-color);
            border-right: 2px solid var(--border-color);
            transition: border-color 0.3s;
        }
        
        .night-mode .sleep-timeline {
            border-left-color: #3d3d5c;
            border-right-color: #3d3d5c;
        }
        
        .timeline-marker {
            position: absolute;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            top: 50%;
            transform: translateY(-50%);
            z-index: 10;
        }
        
        .timeline-label {
            position: absolute;
            top: 60%;
            transform: translateX(-50%);
            font-size: 0.85rem;
            white-space: nowrap;
            color: var(--text-color);
        }
        
        .night-mode .timeline-label {
            color: #e6e6e6;
        }
        
        .timeline-now {
            background-color: var(--medical-red);
        }
        
        .timeline-sleep {
            background-color: var(--sleep-blue);
        }
        
        .timeline-wake {
            background-color: var(--medical-green);
        }
        
        .sleep-quality-indicator {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            margin-right: 0.5rem;
        }
        
        .quality-excellent {
            background-color: var(--medical-green);
        }
        
        .quality-good {
            background-color: var(--medical-yellow);
        }
        
        .quality-poor {
            background-color: var(--medical-red);
        }
        
        /* 睡眠计算器特有的卡片样式 */
        .sleep-time-option {
            background: white;
            border-radius: 8px;
            padding: 1.25rem;
            border: 1px solid var(--border-color);
            margin-bottom: 1rem;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .sleep-time-option:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .night-mode .sleep-time-option:hover {
            box-shadow: 0 4px 8px rgba(0,0,0,0.3);
        }
        
        .sleep-time-option.recommended {
            border: 2px solid var(--sleep-purple);
            background-color: rgba(109, 91, 151, 0.05);
        }
        
        .night-mode .sleep-time-option.recommended {
            border-color: #a9d6e5;
            background-color: rgba(169, 214, 229, 0.1);
        }
        
        .sleep-option-time {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--sleep-purple);
            margin-bottom: 0.5rem;
        }
        
        .night-mode .sleep-option-time {
            color: #a9d6e5;
        }
        
        .sleep-option-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        .night-mode .sleep-option-desc {
            color: #a0a0a0;
        }
        
        /* 睡眠图表容器 */
        .sleep-chart-container {
            position: relative;
            height: 300px;
            width: 100%;
            margin: 1.5rem 0;
        }
        
        /* 睡眠阶段信息卡片 */
        .sleep-stage-card {
            border-left: 4px solid;
            padding: 1rem;
            margin-bottom: 1rem;
            background-color: white;
            border-radius: 0 4px 4px 0;
            transition: all 0.3s;
        }
        
        .stage-light {
            border-left-color: #e9ecef;
            background-color: rgba(233, 236, 239, 0.2);
        }
        
        .night-mode .stage-light {
            border-left-color: #3d3d5c;
            background-color: rgba(61, 61, 92, 0.3);
        }
        
        .stage-deep {
            border-left-color: var(--sleep-blue);
            background-color: rgba(74, 111, 165, 0.1);
        }
        
        .night-mode .stage-deep {
            border-left-color: #4a6fa5;
            background-color: rgba(74, 111, 165, 0.2);
        }
        
        .stage-rem {
            border-left-color: var(--sleep-purple);
            background-color: rgba(109, 91, 151, 0.1);
        }
        
        .night-mode .stage-rem {
            border-left-color: #6d5b97;
            background-color: rgba(109, 91, 151, 0.2);
        }
        
        /* 睡眠计算器特有的表单元素 */
        .time-input-group {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .time-display {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--sleep-purple);
            min-width: 80px;
            text-align: center;
        }
        
        .night-mode .time-display {
            color: #a9d6e5;
        }
        
        .time-slider {
            flex: 1;
        }
        
        .sleep-duration-display {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--sleep-blue);
        }
        
        .night-mode .sleep-duration-display {
            color: #a9d6e5;
        }
        
        /* 睡眠质量指示器 */
        .sleep-quality-meter {
            height: 10px;
            background-color: #e9ecef;
            border-radius: 5px;
            overflow: hidden;
            margin: 1rem 0;
            transition: background-color 0.3s;
        }
        
        .night-mode .sleep-quality-meter {
            background-color: #3d3d5c;
        }
        
        .quality-fill {
            height: 100%;
            border-radius: 5px;
            transition: width 0.5s ease, background-color 0.3s;
        }
        
        /* 夜间模式切换 */
        .night-mode-toggle {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--light-gray);
            border: 1px solid var(--border-color);
            cursor: pointer;
            margin-left: auto;
            transition: all 0.3s;
        }
        
        .night-mode .night-mode-toggle {
            background-color: #3d3d5c;
            border-color: #4d4d6c;
        }
        
        .night-mode-toggle:hover {
            background-color: var(--secondary-color);
        }
        
        .night-mode .night-mode-toggle:hover {
            background-color: #4d4d6c;
        }
        
        /* 睡眠建议卡片 */
        .sleep-tip-card {
            background: white;
            border-radius: 8px;
            padding: 1.25rem;
            border: 1px solid var(--border-color);
            margin-bottom: 1rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        
        .sleep-tip-icon {
            width: 40px;
            height: 40px;
            border-radius: 8px;
            background-color: rgba(74, 111, 165, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            color: var(--sleep-blue);
            font-size: 1.25rem;
            transition: all 0.3s;
        }
        
        .night-mode .sleep-tip-icon {
            background-color: rgba(169, 214, 229, 0.2);
            color: #a9d6e5;
        }
        
        /* 个人设置卡片 */
        .settings-card {
            background: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            margin-bottom: 1.5rem;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        
        .night-mode .settings-card {
            background-color: #2d2d44;
            border-color: #3d3d5c;
        }
        
        .settings-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-color);
            display: flex;
            align-items: center;
        }
        
        .night-mode .settings-title {
            color: #a9d6e5;
        }
        
        /* 高级设置区域 */
        .advanced-settings {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.5s ease-out;
        }
        
        .advanced-settings.expanded {
            max-height: 500px;
        }
        
        /* 保存到日历按钮 */
        .calendar-btn {
            background-color: var(--medical-green);
            border-color: var(--medical-green);
            font-weight: 600;
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            transition: all 0.3s;
        }
        
        .calendar-btn:hover {
            background-color: #157347;
            border-color: #157347;
            transform: translateY(-1px);
        }
        
        /* 移动端优化 */
        @media (max-width: 576px) {
            .time-input-group {
                flex-direction: column;
                align-items: stretch;
                gap: 0.5rem;
            }
            
            .time-display {
                min-width: auto;
                font-size: 1.25rem;
            }
            
            .sleep-chart-container {
                height: 250px;
            }
            
            .chart-container {
                height: 300px;
            }
            
            .sleep-cycle-visual {
                height: 60px;
            }
            
            .sleep-timeline {
                height: 80px;
            }
            
            .timeline-label {
                font-size: 0.7rem;
            }
        }
        
        /* 动画效果 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .fade-in {
            animation: fadeIn 0.5s ease-out;
        }
        
        /* 进度指示器 */
        .progress-indicator {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 2px solid rgba(44, 125, 160, 0.3);
            border-top-color: var(--primary-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            to { transform: rotate(360deg); }
        }
        
        /* 工具提示 */
        .custom-tooltip {
            position: relative;
            display: inline-block;
            border-bottom: 1px dotted #666;
            cursor: help;
        }
        
        .custom-tooltip .tooltip-text {
            visibility: hidden;
            width: 200px;
            background-color: #333;
            color: #fff;
            text-align: center;
            border-radius: 6px;
            padding: 5px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -100px;
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.85rem;
        }
        
        .custom-tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }
        
        .night-mode .custom-tooltip .tooltip-text {
            background-color: #444;
            color: #e6e6e6;
        }
        
        /* 保存偏好设置按钮 */
        .save-prefs-btn {
            background-color: var(--sleep-purple);
            border-color: var(--sleep-purple);
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 6px;
            transition: all 0.3s;
        }
        
        .save-prefs-btn:hover {
            background-color: #5a4a85;
            border-color: #5a4a85;
            transform: translateY(-1px);
        }
        
        /* 闹钟设置区域 */
        .alarm-settings {
            background-color: rgba(255, 193, 7, 0.1);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border: 1px solid rgba(255, 193, 7, 0.2);
            transition: all 0.3s;
        }
        
        .night-mode .alarm-settings {
            background-color: rgba(255, 193, 7, 0.05);
            border-color: rgba(255, 193, 7, 0.1);
        }