/* Site header */
.site-header {
    background-color: var(--color-white);
    border-bottom: 2px solid var(--color-gray-200);
    padding: var(--space-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.site-logo {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.site-logo-icon {
    width: 1.6em;
    height: 1.6em;
}

.site-logo:hover {
    color: var(--color-primary-dark);
    text-decoration: none;
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    padding: var(--space-sm);
    color: var(--color-gray-700);
    font-size: var(--text-xl);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: currentColor;
    margin: 5px 0;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Main nav */
.site-nav ul {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.site-nav a {
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-gray-700);
    padding: var(--space-xs) 0;
    border-bottom: 2px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    text-decoration: none;
}

/* Site footer */
.site-footer {
    background-color: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--space-2xl) 0;
    margin-top: var(--space-4xl);
}

.site-footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    text-align: center;
}

.site-footer a {
    color: var(--color-accent-light);
}

.site-footer a:hover {
    color: var(--color-white);
}

.footer-brand {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-white);
}

.footer-copy {
    font-size: var(--text-sm);
}

.footer-attribution {
    font-size: 0.65rem;
    opacity: 0.6;
}

/* Responsive */
@media (max-width: 48rem) {
    .nav-toggle {
        display: block;
    }

    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        border-bottom: 2px solid var(--color-gray-200);
        padding: var(--space-md) 0;
    }

    .site-nav.open {
        display: block;
    }

    .site-nav ul {
        flex-direction: column;
        align-items: center;
        gap: var(--space-md);
    }

    .site-header .container {
        position: relative;
    }
}