* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
        }
        
        header {
            text-align: center;
            color: white;
            margin-bottom: 40px;
        }
        
        h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }
        
        .subtitle {
            font-size: 1.1em;
            opacity: 0.9;
        }
        
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }
        
        .stat-card {
            background: white;
            border-radius: 15px;
            padding: 25px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            transition: transform 0.3s;
        }
        
        .stat-card:hover {
            transform: translateY(-5px);
        }
        
        .stat-label {
            color: #666;
            font-size: 0.9em;
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        
        .stat-value {
            font-size: 2em;
            font-weight: bold;
            color: #333;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .gold-icon {
            color: #FFD700;
            font-size: 0.8em;
        }
        
        .change {
            font-size: 0.5em;
            padding: 5px 10px;
            border-radius: 5px;
            font-weight: normal;
        }
        
        .change.positive {
            background: #d4edda;
            color: #155724;
        }
        
        .change.negative {
            background: #f8d7da;
            color: #721c24;
        }
        
        .chart-container {
            background: white;
            border-radius: 15px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            margin-bottom: 30px;
        }
        
        .chart-title {
            font-size: 1.5em;
            margin-bottom: 20px;
            color: #333;
        }
        
        .period-buttons {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        
        .period-btn {
            padding: 10px 20px;
            border: 2px solid #667eea;
            background: white;
            color: #667eea;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s;
        }
        
        .period-btn:hover {
            background: #667eea;
            color: white;
        }
        
        .period-btn.active {
            background: #667eea;
            color: white;
        }
        
        .loading {
            text-align: center;
            padding: 40px;
            color: white;
            font-size: 1.2em;
        }
        
        .error {
            background: #f8d7da;
            color: #721c24;
            padding: 20px;
            border-radius: 10px;
            margin: 20px 0;
        }
        
        footer {
            text-align: center;
            color: white;
            margin-top: 40px;
            opacity: 0.8;
            font-size: 0.9em;
        }
        
        @media (max-width: 768px) {
            h1 {
                font-size: 1.8em;
            }
            
            .stat-value {
                font-size: 1.5em;
            }
            
            .chart-container {
                padding: 20px;
            }
        }