/*
 * layout.css … 全画面共通のヘッダー・フッター・コンテナのレイアウト。
 */
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-unit);
    padding: 12px 24px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.site-header__brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-header__logo {
    height: 40px;
    width: auto;
}

.site-header__title {
    font-weight: bold;
    font-size: 1.1rem;
}

.site-header__nav {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.site-footer {
    text-align: center;
    padding: 16px;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--color-border);
}

.page-container {
    max-width: 420px;
    margin: 80px auto;
    text-align: center;
    padding: 0 16px;
}

.menu-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(110px, 1fr));
    gap: 12px;
}

.menu-grid .btn {
    min-height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (max-width: 768px) {
    .menu-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 480px) {
    .menu-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}