*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #3b82f6;--secondary-color: #64748b;--background-color: #ffffff;--surface-color: #f8fafc;--text-color: #1e293b;--text-secondary: #64748b;--border-color: #e2e8f0;--shadow: 0 1px 3px 0 rgba(0, 0, 0, .1), 0 1px 2px 0 rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05)}body.dark-theme{--background-color: #0f172a;--surface-color: #1e293b;--text-color: #f1f5f9;--text-secondary: #94a3b8;--border-color: #334155;--shadow: 0 1px 3px 0 rgba(0, 0, 0, .3), 0 1px 2px 0 rgba(0, 0, 0, .2);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .3), 0 4px 6px -2px rgba(0, 0, 0, .2)}html,body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;height:100%;background-color:var(--background-color);color:var(--text-color);line-height:1.6;transition:background-color .3s ease,color .3s 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