:root {
    --bg: #0b1020;
    --fg: #e8ecf5;
    --muted: #a7b1c6;
    --card: #10172a;
    --shadow: 0 10px 30px rgba(0, 0, 0, .35);
    --radius: 16px;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f6f8fc;
        --fg: #0f172a;
        --muted: #465168;
        --card: #ffffff;
        --shadow: 0 10px 24px rgba(2, 6, 23, .08);
    }
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    text-align: center;
}

.wrap {
    width: 100%;
    max-width: 800px;
    padding: 32px 16px;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 60px 40px;
    position: relative;
}

.badge {
    position: absolute;
    top: -20px;
    right: -10px;
    font-weight: 800;
    font-size: clamp(100px, 22vw, 200px);
    line-height: 1;
    color: rgba(255, 255, 255, .06);
    user-select: none;
    pointer-events: none;
}

.title {
    margin: 0 0 0.8em;
    font-size: clamp(32px, 6vw, 56px);
    font-weight: 700;
}

.lead {
    margin: 0;
    font-size: clamp(20px, 4vw, 28px);
    color: var(--muted);
}

.footer {
    margin-top: 30px;
    color: var(--muted);
    font-size: 16px;
}