:root {
    --bg: #f3f4f8;
    --card: #ffffff;
    --text: #1f2430;
    --muted: #5b6475;
    --accent: #4f46e5;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #12141c;
        --card: #1c1f2b;
        --text: #f1f2f6;
        --muted: #a1a8b8;
        --accent: #818cf8;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.card {
    width: 100%;
    max-width: 480px;
    padding: 32px 20px;
    text-align: center;
    background: var(--card);
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

h1 {
    margin: 0 0 12px;
    font-size: clamp(2rem, 8vw, 4rem);
    color: var(--accent);
}

p {
    margin: 0;
    font-size: clamp(1rem, 3vw, 1.25rem);
    line-height: 1.5;
    color: var(--muted);
}

/* Tablet */
@media (min-width: 600px) {
    .card {
        max-width: 640px;
        padding: 48px 40px;
    }
}

/* Desktop */
@media (min-width: 1024px) {
    .card {
        max-width: 800px;
        padding: 64px;
    }
}