:root {
        --bg: #0b0d12;
        --card: rgba(255, 255, 255, 0.06);
        --border: rgba(255, 255, 255, 0.14);
        --text: rgba(255, 255, 255, 0.92);
        --muted: rgba(255, 255, 255, 0.72);
        --btn: rgba(255, 255, 255, 0.12);
        --btnHover: rgba(255, 255, 255, 0.18);
        --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
    }

    * {
        box-sizing: border-box;
    }

    html,
    body {
        height: 100%;
        margin: 0;
    }

    body {
        font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
        background: radial-gradient(1200px 800px at 50% 30%, rgba(80, 120, 255, 0.18), transparent 60%),
            radial-gradient(1000px 700px at 20% 80%, rgba(180, 80, 255, 0.12), transparent 55%),
            var(--bg);
        color: var(--text);
    }

    .wrap {
        min-height: 100svh;
        display: grid;
        place-items: center;
        padding: 24px;
    }

    .card {
        width: min(720px, 100%);
        background: var(--card);
        border: 1px solid var(--border);
        border-radius: 18px;
        padding: clamp(20px, 4vw, 36px);
        text-align: center;
        box-shadow: var(--shadow);
        backdrop-filter: blur(10px);
    }

    h1 {
        margin: 0 0 10px;
        font-size: clamp(22px, 3.2vw, 34px);
        letter-spacing: -firebase init hosting02em;
    }

    p {
        margin: 0 auto 18px;
        max-width: 50ch;
        line-height: 1.5;
        font-size: clamp(16px, 2.2vw, 18px);
        color: var(--muted);
    }

    .actions {
        display: flex;
        justify-content: center;
        gap: 12px;
        flex-wrap: wrap;
        margin-top: 10px;
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 12px 16px;
        border-radius: 12px;
        border: 1px solid var(--border);
        background: var(--btn);
        color: var(--text);
        text-decoration: none;
        font-weight: 600;
        transition: transform 120ms ease, background 120ms ease;
    }

    .btn:hover {
        background: var(--btnHover);
        transform: translateY(-1px);
    }

    .btn:active {
        transform: translateY(0px);
    }

    .footnote {
        display: block;
        margin-top: 18px;
        color: rgba(255, 255, 255, 0.55);
        font-size: 13px;
    }