/* ============================================
COMPONENT: Header Styles
Описание: Стили для шапки сайта с навигацией и логотипом
============================================ */

/* === ШАПКА САЙТА === */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

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

/* === СОДЕРЖИМОЕ ШАПКИ === */
.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    min-height: 70px;
}

/* === ЛОГОТИП === */
.logo-link {
    display: flex;
    flex-direction: column;
    font-weight: 700;
    transition: transform var(--transition-base);
}

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

.logo-text {
    font-size: var(--font-size-2xl);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.logo-subtext {
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* === НАВИГАЦИЯ === */
.main-navigation {
    display: flex;
}

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

.nav-link {
    font-weight: 500;
    color: var(--color-gray-700);
    position: relative;
    padding: var(--spacing-sm) 0;
    transition: color var(--transition-base);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width var(--transition-base);
}

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

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

/* === МОБИЛЬНОЕ МЕНЮ === */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
    background: transparent;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* === АДАПТИВНОСТЬ === */
@media (max-width: 1024px) {
    .nav-list {
        gap: var(--spacing-lg);
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: var(--spacing-sm) 0;
        min-height: 60px;
    }
    
    .logo-text {
        font-size: var(--font-size-xl);
    }
    
    .logo-subtext {
        font-size: 0.65rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-navigation {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-white);
        box-shadow: var(--shadow-lg);
        transform: translateX(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        z-index: var(--z-dropdown);
        overflow-y: auto;
    }
    
    .main-navigation.active {
        transform: translateX(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--spacing-md);
    }
    
    .nav-link {
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-gray-200);
        font-size: var(--font-size-lg);
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: var(--spacing-xs) 0;
        min-height: 56px;
    }
    
    .logo-text {
        font-size: var(--font-size-lg);
    }
    
    .main-navigation {
        top: 56px;
    }
}