:root {
    --bg-color: #fdfcf9;
    --text-color: #2d3436;
    --link-color: #277da1;
    --font-stack: system-ui, -apple-system, sans-serif;
}
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-stack);
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}
header, footer { margin: 20px 0; }
h1, h2 { color: #000; }
a { color: var(--link-color); }
nav ul { padding: 0; list-style: none; }
nav li { display: inline; margin-right: 15px; }
button { padding: 12px 24px; min-height: 44px; }
input { padding: 12px; min-height: 44px; width: 100%; max-width: 300px; box-sizing: border-box; }
footer { border-top: 1px solid #ccc; padding-top: 20px; font-size: 0.9em; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }
@media (prefers-color-scheme: dark) {
    :root { --bg-color: #1a1a1a; --text-color: #e0e0e0; --link-color: #7cc7ff; }
    h1, h2 { color: #ffffff; }
}