/* ==========================================================================
   NAVIGATION
   ========================================================================== */

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

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: var(--space-4);
}

.logo {
    font-size: var(--fs-xl);
    font-weight: 700;
    color: var(--color-heading);
    text-decoration: none;
}

nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--space-6);
}

nav a {
    color: var(--color-text);
    font-weight: 500;
    position: relative;
}

nav a:hover {
    color: var(--color-primary);
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition);
}

nav a:hover::after {
    width: 100%;
}

/* Mobile Menu */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        gap: var(--space-3);
    }
}