body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #111827;
    color: #f3f4f6;
    margin: 0;
    padding: 20px 0;
    min-height: 100vh;
}
*, *::before, *::after { box-sizing: border-box; }
a { color: inherit; text-decoration: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }