:root {
    --bg: #0f141e;
    --card: #1a212e;
    --accent: #2f80ed;
    color-scheme: dark;
}

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

body {
    font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: #e6e9ef;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 16px;
}

.card {
    background: var(--card);
    border-radius: 16px;
    padding: 24px;
    width: 100%;
    max-width: 420px;
    text-align: center;
}

h1 { font-size: 22px; margin-bottom: 12px; }

p { margin-bottom: 20px; color: #aab3c3; }

button {
    background: var(--accent);
    color: #fff;
    border: 0;
    border-radius: 12px;
    padding: 14px 20px;
    font-size: 16px;
    width: 100%;
    cursor: pointer;
}