:root[data-theme=light]{--bg-primary: #f8fafc;--bg-secondary: #ffffff;--bg-tertiary: #f1f5f9;--bg-hover: #e2e8f0;--text-primary: #0f172a;--text-secondary: #475569;--text-tertiary: #94a3b8;--border-color: #e2e8f0;--border-hover: #cbd5e1;--accent-primary: #3b82f6;--accent-hover: #2563eb;--accent-light: #dbeafe;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px 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);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 10px 10px -5px rgba(0, 0, 0, .04);--success: #10b981;--warning: #f59e0b;--error: #ef4444;--info: #3b82f6}:root[data-theme=dark]{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--bg-hover: #475569;--text-primary: #f1f5f9;--text-secondary: #cbd5e1;--text-tertiary: #64748b;--border-color: #334155;--border-hover: #475569;--accent-primary: #3b82f6;--accent-hover: #60a5fa;--accent-light: #1e3a8a;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -1px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -2px rgba(0, 0, 0, .4);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .6), 0 10px 10px -5px rgba(0, 0, 0, .5);--success: #10b981;--warning: #f59e0b;--error: #ef4444;--info: #3b82f6}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.notes-app{min-height:100vh;background:var(--bg-primary);color:var(--text-primary);transition:background .3s ease,color .3s ease}.toast-container{position:fixed;top:20px;right:20px;z-index:10000;display:flex;flex-direction:column;gap:12px;pointer-events:none}.toast{background:var(--bg-secondary);color:var(--text-primary);padding:14px 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