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

:root {
    --color-primary: #1a1a2e;
    --color-accent: #4fc3f7;
    --color-bg: #f8f9fa;
    --color-text: #222;
    --color-muted: #666;
    --color-white: #fff;
    --max-width: 720px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

header {
    text-align: center;
}

header h1 {
    font-size: 2rem;
    color: var(--color-primary);
}

.subtitle {
    margin-top: 0.5rem;
    color: var(--color-muted);
    font-size: 1.1rem;
}

.notice {
    background: var(--color-white);
    border-radius: 8px;
    padding: 2rem 1.5rem;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.notice h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.notice p {
    font-size: 1.05rem;
    color: var(--color-muted);
}

.contact {
    text-align: center;
}

.contact a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

.contact a:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    color: var(--color-muted);
    font-size: 0.85rem;
    border-top: 1px solid #e0e0e0;
    padding-top: 1.5rem;
}

@media (max-width: 480px) {
    .container {
        padding: 1.5rem 1rem;
    }

    header h1 {
        font-size: 1.5rem;
    }
}