/* ===================================
   Header & Navigation
   =================================== */

/* Main Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: var(--z-index-fixed);
    transition: all var(--transition-base);
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.header.scrolled::before {
    opacity: 1;
}

.header.scrolled {
    height: 70px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

/* Header Container */
.header-container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    z-index: 10;
}

.logo-icon {
    width: 50px;
    height: 50px;
    transition: transform var(--transition-base);
}

.logo:hover .logo-icon {
    transform: scale(1.1);
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-white);
    letter-spacing: 1px;
}

.logo-text span {
    color: var(--primary-blue-light);
}

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

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

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--text-white);
    text-decoration: none;
    transition: color var(--transition-base);
    position: relative;
}

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

.nav-link:hover,
.nav-link.active {
    color: var(--primary-blue-light);
}

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

.nav-icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
    transition: transform var(--transition-base);
}

.nav-item:hover .nav-icon {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 220px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    padding: var(--spacing-md) 0;
    margin-top: var(--spacing-sm);
}

.nav-item:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-xl);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
}

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

.dropdown-icon {
    width: 20px;
    height: 20px;
    fill: var(--primary-blue);
}

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.header-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 1.25rem;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-white);
    background: var(--bg-gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.header-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
}

.header-btn-icon {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* Mobile Menu Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: var(--spacing-sm);
    cursor: pointer;
    z-index: 10;
}

.mobile-toggle span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--text-white);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

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

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

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

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--bg-gradient-dark);
    z-index: var(--z-index-fixed);
    padding: calc(var(--header-height) + var(--spacing-xl)) var(--container-padding) var(--spacing-xl);
    overflow-y: auto;
}

.mobile-nav.active {
    display: block;
    animation: fadeIn var(--animation-duration-base);
}

.mobile-nav-list {
    list-style: none;
}

.mobile-nav-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xl) 0;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-white);
    text-decoration: none;
    transition: color var(--transition-base);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    color: var(--primary-blue-light);
}

.mobile-nav-icon {
    width: 24px;
    height: 24px;
    fill: currentColor;
    transition: transform var(--transition-base);
}

.mobile-nav-item.active .mobile-nav-icon {
    transform: rotate(180deg);
}

.mobile-subnav {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.mobile-nav-item.active .mobile-subnav {
    max-height: 500px;
}

.mobile-subnav-list {
    padding: var(--spacing-md) 0 var(--spacing-lg) var(--spacing-xl);
    list-style: none;
}

.mobile-subnav-link {
    display: block;
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-base);
    color: var(--text-light);
    text-decoration: none;
    transition: color var(--transition-base);
}

.mobile-subnav-link:hover {
    color: var(--primary-blue-light);
}

.mobile-nav-actions {
    margin-top: var(--spacing-2xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mobile-nav-btn {
    width: 100%;
    padding: var(--spacing-lg);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-white);
    background: var(--bg-gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-base);
    text-decoration: none;
}

.mobile-nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
}

/* Mobile Header */
@media (max-width: 1024px) {
    .nav {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .header-actions {
        display: none;
    }
}

/* Header Overlay */
.header-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-index-fixed) - 1);
}

.header-overlay.active {
    display: block;
    animation: fadeIn var(--animation-duration-base);
}

/* Sticky Header Animation */
@keyframes headerSlideDown {
    from {
        transform: translateY(-100%);
    }
    to {
        transform: translateY(0);
    }
}

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

/* Header Search */
.header-search {
    position: relative;
}

.search-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background var(--transition-base);
}

.search-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.search-toggle svg {
    width: 20px;
    height: 20px;
    fill: var(--text-white);
}

.search-form {
    position: absolute;
    top: 100%;
    right: 0;
    width: 300px;
    padding: var(--spacing-md);
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
}

.header-search.active .search-form {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.search-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-blue);
}

/* Language Selector */
.lang-selector {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-white);
    background: transparent;
    border: none;
    cursor: pointer;
}

.lang-btn svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 150px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
}

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

.lang-option {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: background var(--transition-base);
}

.lang-option:hover {
    background: var(--bg-light);
    color: var(--primary-blue);
}