:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.8);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --border: rgba(255, 255, 255, 0.1);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.container {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 3rem 2rem;
    border-radius: 1rem;
    text-align: center;
    max-width: 480px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}
h1 { color: var(--accent); margin-bottom: 0.75rem; font-size: 1.85rem; }
p { color: var(--text-muted); font-size: 1rem; }