:root[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f5f7fa;--bg-tertiary: #e2e8f0;--text-primary: #1a1a1a;--text-secondary: #4a5568;--text-tertiary: #666666;--hero-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--card-bg: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);--button-primary-bg: #667eea;--button-primary-text: #ffffff;--button-secondary-bg: rgba(255, 255, 255, .15);--button-secondary-border: rgba(255, 255, 255, .3);--shadow-sm: 0 2px 10px rgba(0, 0, 0, .05);--shadow-md: 0 4px 20px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 30px rgba(102, 126, 234, .2);--border-color: #e2e8f0;--theme-toggle-bg: #f5f7fa;--theme-toggle-border: #e2e8f0;--theme-toggle-color: #667eea;--theme-toggle-hover-bg: #e2e8f0}:root[data-theme=dark],:root{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--text-primary: #f1f5f9;--text-secondary: #cbd5e1;--text-tertiary: #94a3b8;--hero-bg: linear-gradient(135deg, #4c1d95 0%, #5b21b6 100%);--card-bg: linear-gradient(135deg, #1e293b 0%, #334155 100%);--button-primary-bg: #667eea;--button-primary-text: #ffffff;--button-secondary-bg: rgba(255, 255, 255, .1);--button-secondary-border: rgba(255, 255, 255, .2);--shadow-sm: 0 2px 10px rgba(0, 0, 0, .3);--shadow-md: 0 4px 20px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 30px rgba(102, 126, 234, .3);--border-color: #334155;--theme-toggle-bg: #1e293b;--theme-toggle-border: #334155;--theme-toggle-color: #667eea;--theme-toggle-hover-bg: #334155}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--bg-primary);color:var(--text-primary);transition:background-color .3s ease,color .3s ease}