:root{--page-bg:#fff;--header-bg:#fff;--card-bg:#fff;--input-bg:#fff;--result-bg:#f3f4f6;--section-bg:#f9fafb;--footer-bg:#f9fafb;--footer-bg-end:#f3f4f6;--footer-text:#1f2937;--footer-text-secondary:#6b7280;--text-primary:#1f2937;--text-secondary:#6b7280;--border-color:#e5e7eb;--hover-bg:#f3f4f6;--link-color:#3b82f6;--button-bg:#fff;--home-bg-start:#e0f2fe;--home-bg-middle:#f0f9ff;--home-bg-end:#fff;--home-bg-before-start:#bfdbfe;--home-bg-before-middle:#dbeafe;--home-bg-before-end:#e0f2fe;--section-bg:hsla(0,0%,100%,.8);--card-bg:hsla(0,0%,100%,.95);--tool-card-start:#f0f9ff;--tool-card-end:#fff;--tool-card-alt-start:#f8fafc}.dark{--page-bg:#111827;--header-bg:#1f2937;--card-bg:#1f2937;--input-bg:#374151;--result-bg:#374151;--section-bg:#1f2937;--footer-bg:#0f172a;--footer-bg-end:#111827;--footer-text:#e5e7eb;--footer-text-secondary:#9ca3af;--text-primary:#e5e7eb;--text-secondary:#9ca3af;--border-color:#374151;--hover-bg:#374151;--link-color:#60a5fa;--button-bg:#374151;--home-bg-start:#1f2937;--home-bg-middle:#1f2937;--home-bg-end:#111827;--home-bg-before-start:#1f2937;--home-bg-before-middle:#1f2937;--home-bg-before-end:#1f2937;--section-bg:rgba(31,41,55,.8);--card-bg:rgba(31,41,55,.9);--tool-card-start:#1f2937;--tool-card-end:#1f2937;--tool-card-alt-start:#1f2937}*{box-sizing:border-box}body{background:var(--page-bg);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;margin:0;padding:0;transition:background-color .3s ease,color .3s ease}a{color:var(--link-color);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font-family:inherit}