/* ========================================
   HEADER STYLES
   Navigazione principale e mobile
   ======================================== */

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    z-index: var(--z-fixed);
    transition: all var(--transition-normal);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    gap: var(--spacing-md);
}

/* Logo */
.logo-container {
    flex-shrink: 0;
}

.logo {
    height: 50px;
    width: auto;
    transition: opacity var(--transition-fast);
}

.logo-light {
    display: none;
}

.logo-dark {
    display: block;
}

body.theme-light .logo-light {
    display: block;
}

body.theme-light .logo-dark {
    display: none;
}

/* Navigation */
.main-nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

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

.nav-link {
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: var(--gradient-primary);
    transition: transform var(--transition-fast);
}

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

.nav-link:hover::after {
    transform: translateX(-50%) scaleX(1);
}

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

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

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-btn:hover {
    background: var(--bg-tertiary);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
}

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

.lang-option {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.lang-option:hover {
    background: var(--bg-secondary);
}

.lang-option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.lang-option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.flag-icon {
    width: 20px;
    height: 15px;
    object-fit: cover;
    border-radius: 2px;
}

/* Theme Toggle */
.theme-toggle {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--text-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: scale(1.05);
}

.sun-icon,
.moon-icon {
    position: absolute;
    transition: all var(--transition-normal);
}

.sun-icon {
    opacity: 0;
    transform: rotate(-90deg) scale(0);
}

.moon-icon {
    opacity: 1;
    transform: rotate(0) scale(1);
}

body.theme-light .sun-icon {
    opacity: 1;
    transform: rotate(0) scale(1);
}

body.theme-light .moon-icon {
    opacity: 0;
    transform: rotate(90deg) scale(0);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(7px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-7px);
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--bg-card);
    z-index: var(--z-modal);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    overflow-y: auto;
}

.mobile-menu-overlay.active {
    transform: translateX(0);
}

.mobile-menu-content {
    padding: var(--spacing-lg);
}

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

.mobile-nav-link {
    padding: 1rem;
    color: var(--text-primary);
    font-weight: var(--font-medium);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

/* Responsive */
@media (max-width: 1024px) {
    .nav-list {
        gap: var(--spacing-md);
    }
    
    .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: var(--text-sm);
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .header-actions .btn {
        display: none;
    }
}

@media (max-width: 480px) {
    .logo {
        height: 40px;
    }
    
    .header-content {
        padding: 0.75rem 0;
    }
    
    .lang-btn span {
        display: none;
    }
}