/* ==========================================================================
   Header Component
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    background-color: var(--neutral-100);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

/* Logo */
.logo a {
    font-family: var(--font-heading);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-dark);
    letter-spacing: -0.02em;
}

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

/* Main Navigation */
.nav-list {
    display: none;
    list-style: none;
    gap: var(--space-4);
}

.nav-link {
    font-weight: 500;
    color: var(--neutral-700);
    position: relative;
    padding: var(--space-1) 0;
}

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

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

.nav-link:hover::after {
    width: 100%;
}

.nav-link--active {
    color: var(--primary);
    font-weight: 600;
}

.nav-link--active::after {
    width: 100%;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-1);
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--neutral-800);
    margin: 4px 0;
    transition: var(--transition);
}

/* Mobile Menu (Expanded State) */
.nav--expanded .nav-list {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background-color: var(--neutral-100);
    padding: var(--space-4);
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--border-color);
}

.nav--expanded .mobile-menu-toggle span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav--expanded .mobile-menu-toggle span:nth-child(2) {
    opacity: 0;
}

.nav--expanded .mobile-menu-toggle span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Desktop Navigation */
@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }
    
    .nav-list {
        display: flex;
        position: static;
        flex-direction: row;
        padding: 0;
        box-shadow: none;
        border-top: none;
    }
}