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

body {
    font-family: "Inter", "Noto Sans JP", sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #fdfdfd, #f3f4f6);
    color: #111827;
    padding: 1rem;
}

.card {
    background: #ffffff;
    border-radius: 1rem;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    max-width: 540px;
    width: 100%;
    padding: 2.5rem 2rem;
    text-align: center;
    animation: fadeIn 0.6s ease;
}

h1 {
    font-size: 1.9rem;
    font-weight: 700;
    margin-bottom: 1.2rem;
    color: #9ba85f;
    letter-spacing: 0.02em;
}

p {
    font-size: 1rem;
    color: #374151;
    line-height: 1.7;
    margin-bottom: 2rem;
}

.notice {
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 0.75rem;
    padding: 1rem 1.2rem;
    font-size: 0.95rem;
    color: #1f2937;
    margin-bottom: 2rem;
}

footer {
    font-size: 0.85rem;
    color: #9ca3af;
    letter-spacing: 0.02em;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #1e293b, #0f172a);
        color: #f1f5f9;
    }
    .card {
        background: #1f2937;
        color: #f1f5f9;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.6);
    }
    p {
        color: #e2e8f0;
    }
    .notice {
        background: #111827;
        border: 1px solid #374151;
        color: #e2e8f0;
    }
    footer {
        color: #64748b;
    }
}