:root {
            --primary-color: #4361ee;
            --secondary-color: #3a0ca3;
            --pv-color: #f72585;
            --uv-color: #4cc9f0;
            --background: #f8f9fa;
            --card-bg: #ffffff;
            --text-color: #2b2d42;
            --text-secondary: #8d99ae;
        }
        body {
            background: var(--background);
            margin: 0;
            padding: 20px;
            color: var(--text-color);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: var(--card-bg);
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
            padding: 30px;
            transition: all 0.3s ease;
        }
        .header {
            text-align: center;
            margin-bottom: 40px;
        }
        .header h1 {
            font-weight: 600;
            color: var(--secondary-color);
            margin-bottom: 8px;
        }
        .header p {
            color: var(--text-secondary);
            margin: 0;
            font-size: 0.95em;
        }
        .controls {
            display: flex;
            gap: 15px;
            align-items: center;
            margin-bottom: 30px;
            background: rgba(67, 97, 238, 0.05);
            padding: 15px 20px;
            border-radius: 10px;
        }
        .controls label {
            font-weight: 500;
            color: var(--secondary-color);
        }
        #dayRange {
            flex-grow: 1;
            height: 8px;
            border-radius: 4px;
            background: #e9ecef;
            outline: none;
            -webkit-appearance: none;
        }
        #dayRange::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-color);
            cursor: pointer;
            box-shadow: 0 2px 4px rgba(0,0,0,0.2);
            transition: all 0.2s ease;
        }
        #dayRange::-webkit-slider-thumb:hover {
            transform: scale(1.1);
        }
        #dayCount {
            min-width: 60px;
            text-align: center;
            font-weight: 500;
            color: var(--primary-color);
            background: rgba(67, 97, 238, 0.1);
            padding: 5px 10px;
            border-radius: 6px;
        }
        .chart-container {
            position: relative;
            height: 500px;
            margin: 20px 0;
            background: var(--card-bg);
            border-radius: 10px;
            padding: 15px;
            box-shadow: inset 0 0 10px rgba(0,0,0,0.03);
        }
        .date-range {
            color: var(--text-secondary);
            font-size: 0.9em;
            text-align: center;
            margin-top: 15px;
            padding: 10px;
            background: rgba(138, 180, 248, 0.1);
            border-radius: 8px;
        }
        .chart-legend {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 20px;
        }
        .legend-item {
            display: flex;
            align-items: center;
            font-size: 0.85em;
        }
        .legend-color {
            width: 12px;
            height: 12px;
            border-radius: 3px;
            margin-right: 8px;
        }
        .pv-color {
            background-color: var(--pv-color);
        }
        .uv-color {
            background-color: var(--uv-color);
        }