:root{--bg-color: #ffffff;--text-color: #2c3e50;--card-bg: #ffffff;--card-border: #f0f0f0;--header-bg: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);--header-border: #e0e0e0;--shadow-color: rgba(0, 0, 0, .1);--shadow-hover: rgba(0, 0, 0, .15);--muted-text: #666;--error-bg: #fee;--error-border: #fcc;--no-data-bg: #f8f9fa;--no-data-text: #6c757d}.dark-theme{--bg-color: #1a1a1a;--text-color: #e0e0e0;--card-bg: #2d2d2d;--card-border: #404040;--header-bg: linear-gradient(135deg, #2d2d2d 0%, #3a3a3a 100%);--header-border: #404040;--shadow-color: rgba(0, 0, 0, .3);--shadow-hover: rgba(0, 0, 0, .4);--muted-text: #a0a0a0;--error-bg: #3d1a1a;--error-border: #5d2020;--no-data-bg: #2d2d2d;--no-data-text: #a0a0a0}body{margin:0;padding:0;transition:background-color .3s ease,color .3s ease}