*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: #111;
    color: #f0f0f0;
    min-height: 100vh;
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    padding: 40px 0 0;
}

.mark {
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: #555;
}

main {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 40px 0;
}

h1 {
    font-size: clamp(28px, 5vw, 42px);
    font-weight: 300;
    letter-spacing: -0.01em;
}

footer {
    padding: 40px 0;
    border-top: 1px solid #222;
}

nav {
    display: flex;
    gap: 24px;
    margin-bottom: 16px;
}

nav a {
    font-size: 13px;
    color: #555;
    text-decoration: none;
    transition: color 0.2s;
}

nav a:hover { color: #f0f0f0; }

small {
    font-size: 11px;
    color: #333;
}