/* Header and Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: none;
    gap: var(--spacing-md);
}

.nav-item {
    position: relative;
}

.nav-link {
    font-weight: 500;
    color: var(--text-200);
    transition: var(--transition-fast);
    padding: 0.5rem 0;
}

.nav-link:hover, 
.nav-link.active {
    color: var(--accent-200);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-200);
    transition: var(--transition-normal);
}

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

/* Mobile menu */
.mobile-menu-btn {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-200);
    transition: var(--transition-normal);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 400px;
    height: 100vh;
    background-color: white;
    box-shadow: var(--shadow-lg);
    padding: 6rem var(--spacing-lg) var(--spacing-lg);
    transition: var(--transition-normal);
    z-index: 1000;
}

.mobile-menu.active {
    right: 0;
}

.mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mobile-nav-link {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-200);
    transition: var(--transition-fast);
    padding: 0.5rem 0;
    display: block;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    color: var(--accent-200);
    transform: translateX(5px);
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 999;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Media queries */
@media (min-width: 768px) {
    .mobile-menu-btn {
        display: none;
    }
    
    .nav-list {
        display: flex;
    }
}