:root{--bg-color:#f9f9fb;--surface-color:#fff;--text-primary:#1e293b;--text-secondary:#475569;--border-color:#e2e8f0;--primary-color:#3b82f6;--primary-hover:#2563eb;--success-color:#10b981;--error-color:#ef4444;--font-family:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}[data-theme=dark]{--bg-color:#0f172a;--surface-color:#1e293b;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--border-color:#334155;--primary-color:#60a5fa;--primary-hover:#3b82f6}[data-theme=sepia]{--bg-color:#fdf6e3;--surface-color:#eee8d5;--text-primary:#586e75;--text-secondary:#657b83;--border-color:#d33682;--primary-color:#8b6900;--primary-hover:#9c3811}html,body{font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;padding:0;line-height:1.65;transition:background-color .3s,color .3s}*,:before,:after{box-sizing:border-box}a{color:var(--primary-color);text-decoration:none}a:hover{text-decoration:underline}button{font-family:var(--font-family)}