/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--white);
    box-shadow: var(--shadow-light);
    z-index: 1000;
    transition: all var(--transition-medium);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.navbar {
    padding: 8px 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.nav-logo img {
    height: 60px;
    width: auto;
    transition: transform var(--transition-fast);
}

.nav-logo:hover img {
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    position: relative;
    color: var(--dark-gray);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-blue);
    background-color: rgba(30, 58, 95, 0.1);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--primary-blue);
    transition: all var(--transition-fast);
    transform: translateX(-50%);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--spacing-xs);
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--dark-gray);
    border-radius: 2px;
    transition: all var(--transition-fast);
    transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Menu */
@media (max-width: 992px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        right: -100%;
        width: 300px;
        height: calc(100vh - 80px);
        background: var(--white);
        flex-direction: column;
        justify-content: flex-start;
        align-items: flex-start;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-medium);
        transition: right var(--transition-medium);
        gap: var(--spacing-md);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        width: 100%;
        padding: var(--spacing-md);
        border-radius: var(--radius-md);
        font-size: 1.1rem;
    }
    
    .nav-link::after {
        display: none;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: var(--spacing-xs) 0;
    }
    
    .nav-logo img {
        height: 40px;
    }
    
    .nav-menu {
        top: 70px;
        height: calc(100vh - 70px);
        width: 280px;
    }
}

@media (max-width: 576px) {
    .nav-container {
        padding: 0 var(--spacing-sm);
    }
    
    .nav-logo img {
        height: 35px;
    }
    
    .nav-menu {
        width: 100%;
        right: -100%;
        padding: var(--spacing-md);
    }
    
    .nav-menu.active {
        right: 0;
    }
}

/* Smooth scroll offset for fixed header */
html {
    scroll-padding-top: 80px;
}

/* Header animation on scroll */
@keyframes slideDown {
    from {
        transform: translateY(-100%);
    }
    to {
        transform: translateY(0);
    }
}

.header {
    animation: slideDown 0.5s ease-out;
}

/* Active section highlighting */
.nav-link[data-active="true"] {
    color: var(--primary-blue);
    font-weight: var(--font-weight-semibold);
}

/* Mobile menu overlay */
.nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.nav-overlay.active {
    display: block;
    opacity: 1;
}

@media (max-width: 992px) {
    .nav-overlay {
        display: block;
    }
}

/* Header logo text fallback */
.nav-logo-text {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary-blue);
    display: none;
}

/* If logo image fails to load */
.nav-logo img:not([src]),
.nav-logo img[src=""] {
    display: none;
}

.nav-logo img:not([src]) + .nav-logo-text,
.nav-logo img[src=""] + .nav-logo-text {
    display: block;
}

/* Header search (if needed in future) */
.nav-search {
    display: none;
    position: relative;
    margin-left: var(--spacing-md);
}

.nav-search input {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--light-gray);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    width: 200px;
    transition: all var(--transition-fast);
}

.nav-search input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.nav-search button {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--dark-gray);
    cursor: pointer;
    padding: var(--spacing-xs);
}

/* Header CTA button */
.nav-cta {
    margin-left: var(--spacing-md);
}

.nav-cta .btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.9rem;
}

@media (max-width: 992px) {
    .nav-cta {
        display: none;
    }
}

/* Scroll indicator */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-blue));
    z-index: 1001;
    transition: width var(--transition-fast);
}

/* Header variations */
.header-transparent {
    background: transparent;
    box-shadow: none;
}

.header-transparent .nav-link {
    color: var(--white);
}

.header-transparent .nav-link:hover {
    color: var(--accent-yellow);
    background-color: rgba(255, 255, 255, 0.1);
}

.header-transparent .nav-toggle span {
    background-color: var(--white);
}

/* Dropdown menu styles (if needed) */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    min-width: 200px;
    box-shadow: var(--shadow-medium);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-item {
    display: block;
    padding: var(--spacing-xs) var(--spacing-md);
    color: var(--dark-gray);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.nav-dropdown-item:hover {
    background-color: var(--light-gray);
    color: var(--primary-blue);
}