/* Layout — navbar, main, footer (STEP 02) */

.site-header {
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding-block: var(--space-md);
    position: relative;
}

.site-logo {
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: 0.02em;
    margin-right: auto;
}

.site-logo:hover {
    color: var(--color-accent);
}

.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.nav-toggle-label {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 2rem;
    height: 2rem;
    cursor: pointer;
}

.nav-toggle-label span {
    display: block;
    height: 2px;
    width: 100%;
    background-color: var(--color-text);
    border-radius: var(--radius-sm);
}

.site-nav {
    display: none;
    flex: 1 0 100%;
    width: 100%;
}

.nav-toggle:checked ~ .site-nav {
    display: block;
}

.site-nav__list {
    list-style: none;
    margin: 0;
    padding: var(--space-md) 0 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.site-nav__list a {
    color: var(--color-muted);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    padding: var(--space-sm) 0;
}

.site-nav__list a:hover {
    color: var(--color-text);
}

#main {
    min-height: 50vh;
}

.site-footer {
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-2xl);
    padding-block: var(--space-xl);
    background-color: var(--color-surface);
}

.site-footer__inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.site-footer__brand {
    margin: 0;
    font-weight: 600;
    color: var(--color-text);
}

.site-footer__copy {
    margin: 0;
    color: var(--color-muted);
    font-size: 0.875rem;
}

.site-footer__links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.site-footer__links a {
    color: var(--color-muted);
    text-decoration: none;
}

.site-footer__links a:hover {
    color: var(--color-accent);
}

@media (min-width: 48rem) {
    .nav-toggle-label {
        display: none;
    }

    .site-nav {
        display: block;
        flex: 0 1 auto;
        width: auto;
    }

    .site-logo {
        margin-right: 0;
    }

    .site-nav__list {
        flex-direction: row;
        align-items: center;
        gap: var(--space-lg);
        padding: 0;
    }

    .site-nav__list a {
        padding: var(--space-xs) 0;
    }

    .site-footer__inner {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}