/**
 * Global Header Styles
 * TZFoundry - Foundry Equipment Manufacturer
 * 
 * Design System:
 * - Primary: #0F172A (dark blue structure)
 * - CTA: #16A34A (safety green)
 * - Accent: #D97706 (molten metal orange)
 * - Logo colors: #022c44 (dark blue), #b8011f (red)
 * 
 * State Management:
 * - Top state: Normal flow, light surface with dark foreground for hero variability
 * - Scrolled state: Fixed, compact, stable contrast
 * - Top Bar collapses on scroll
 */

/* ============================================
   CSS Variables - State-Aware Contrast System
   ============================================ */
:root {
    /* Typography */
    --font-heading: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    
    /* Brand Colors */
    --color-primary: #0F172A;
    --color-primary-light: #1E3A5F;
    --color-primary-800: #1E293B;
    --color-cta: #16A34A;
    --color-cta-hover: #15803D;
    --color-cta-light: #22C55E;
    --color-accent: #D97706;
    --color-accent-light: #F59E0B;
    
    /* Neutrals */
    --color-neutral-50: #F8FAFC;
    --color-neutral-100: #F1F5F9;
    --color-neutral-200: #E2E8F0;
    --color-neutral-300: #CBD5E1;
    --color-neutral-500: #64748B;
    --color-neutral-600: #475569;
    --color-neutral-700: #334155;
    
    /* Header State Variables - Top (Unscrolled) */
    --header-bg: rgba(255, 255, 255, 0.97);
    --header-fg: #0F172A;
    --header-fg-secondary: #475569;
    --header-border: rgba(15, 23, 42, 0.08);
    --header-surface: #ffffff;
    --header-logo-filter: none;
    
    /* Top Bar */
    --topbar-bg: #0F172A;
    --topbar-fg: rgba(255, 255, 255, 0.85);
    --topbar-fg-hover: #ffffff;
    --topbar-border: rgba(255, 255, 255, 0.1);
    
    /* Spacing */
    --header-height-top: 72px;
    --header-height-scrolled: 64px;
    --topbar-height: 44px;
    --container-max-width: 1440px;
    --container-padding: 1.5rem;
    
    /* Transitions */
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Base Header Structure
   ============================================ */
.site-header {
    position: relative;
    z-index: 1000;
    font-family: var(--font-body);
}

/* Top Bar */
.header-top-bar {
    background: var(--topbar-bg);
    color: var(--topbar-fg);
    border-bottom: 1px solid var(--topbar-border);
    height: var(--topbar-height);
    transition: height var(--transition-smooth), 
                max-height var(--transition-smooth),
                opacity var(--transition-smooth),
                transform var(--transition-smooth);
    overflow: hidden;
}

.top-bar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--topbar-height);
    gap: 2rem;
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.top-bar-link,
.top-bar-text {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--topbar-fg);
    text-decoration: none;
    transition: color var(--transition-base);
}

.top-bar-link:hover {
    color: var(--topbar-fg-hover);
}

.top-bar-link i,
.top-bar-text i {
    font-size: 0.875rem;
    color: var(--color-cta-light);
}

.language-switcher-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.language-switcher-wrapper .fa-globe {
    color: var(--color-cta-light);
    font-size: 1rem;
}

.jcm-language-switcher {
    position: relative;
}

/* Main Header */
.header-main {
    background: var(--header-bg);
    border-bottom: 1px solid var(--header-border);
    transition: background var(--transition-smooth),
                box-shadow var(--transition-smooth),
                height var(--transition-smooth);
    position: relative;
}

.header-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.header-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    height: var(--header-height-top);
    gap: 2rem;
    transition: height var(--transition-smooth);
}

/* ============================================
   Brand Zone
   ============================================ */
.header-brand {
    display: flex;
    align-items: center;
}

.logo-link {
    display: block;
    line-height: 0;
}

.logo-image {
    height: 32px;
    width: auto;
    display: block;
    filter: var(--header-logo-filter);
    transition: filter var(--transition-smooth);
}

/* ============================================
   Navigation Zone (Centered)
   ============================================ */
.header-nav {
    justify-self: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-link,
.nav-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--header-fg);
    text-decoration: none;
    padding: 0.5rem 0;
    background: none;
    border: none;
    cursor: pointer;
    transition: color var(--transition-base);
    position: relative;
}

.nav-link:hover,
.nav-trigger:hover {
    color: var(--color-cta);
}

.nav-link.is-active {
    color: var(--color-cta);
}

.nav-link.is-active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-cta);
}

.nav-icon {
    font-size: 0.75rem;
    transition: transform var(--transition-base);
}

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

/* ============================================
   Action Zone
   ============================================ */
.header-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 1rem;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-cta);
    color: #ffffff;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    padding: 0.625rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    transition: background var(--transition-base);
}

.btn-cta:hover {
    background: var(--color-cta-hover);
}

.btn-cta i {
    font-size: 0.875rem;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.375rem;
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--header-fg);
    transition: all var(--transition-base);
}

/* ============================================
   Products Mega Menu
   ============================================ */
.mega-menu-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--header-surface);
    border-bottom: 1px solid var(--header-border);
    box-shadow: 0 10px 40px rgba(15, 23, 42, 0.12);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--transition-smooth),
                visibility var(--transition-smooth),
                transform var(--transition-smooth);
    pointer-events: none;
}

.header-main[data-mega-open="products"] .mega-menu-dropdown[data-dropdown-panel="products"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.mega-menu-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 3rem;
    padding: 2.5rem 0;
}

.mega-menu-categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

.mega-menu-category {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.category-title {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--header-fg);
    text-decoration: none;
    transition: color var(--transition-base);
}

.category-title:hover {
    color: var(--color-cta);
}

.category-description {
    font-size: 0.875rem;
    color: var(--header-fg-secondary);
    line-height: 1.5;
    margin: 0;
}

.category-links {
    list-style: none;
    margin: 0.5rem 0 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--header-fg-secondary);
    text-decoration: none;
    transition: color var(--transition-base), transform var(--transition-base);
}

.category-link:hover {
    color: var(--color-cta);
    transform: translateX(4px);
}

.category-link i {
    font-size: 0.75rem;
    color: var(--color-accent);
}

.view-all-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-cta);
    text-decoration: none;
    margin-top: 0.5rem;
    transition: gap var(--transition-base);
}

.view-all-link:hover {
    gap: 0.625rem;
}

.view-all-link i {
    font-size: 0.75rem;
}

/* Support Card */
.mega-menu-support {
    width: 280px;
    flex-shrink: 0;
}

.support-card {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    padding: 1.75rem;
    border-radius: 6px;
    color: #ffffff;
}

.support-icon {
    font-size: 2rem;
    color: var(--color-cta-light);
    margin-bottom: 1rem;
}

.support-title {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0 0 0.75rem 0;
}

.support-text {
    font-size: 0.875rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.85);
    margin: 0 0 1.25rem 0;
}

.support-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-cta-light);
    text-decoration: none;
    transition: gap var(--transition-base);
}

.support-link:hover {
    gap: 0.625rem;
}

.support-link i {
    font-size: 0.75rem;
}

/* ============================================
   Scrolled State
   ============================================ */
.site-header[data-header-state="scrolled"] {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
}

.site-header[data-header-state="scrolled"] .header-top-bar {
    height: 0;
    max-height: 0;
    opacity: 0;
    transform: translateY(-100%);
    border-bottom-width: 0;
}

.site-header[data-header-state="scrolled"] .header-main {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 12px rgba(15, 23, 42, 0.08);
}

.site-header[data-header-state="scrolled"] .header-content {
    height: var(--header-height-scrolled);
}

.site-header[data-header-state="scrolled"] .logo-image {
    height: 28px;
}

/* ============================================
   Mobile Menu
   ============================================ */
.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 400px;
    background: var(--header-surface);
    box-shadow: -4px 0 24px rgba(15, 23, 42, 0.15);
    transform: translateX(100%);
    transition: transform var(--transition-smooth);
    z-index: 2000;
    overflow-y: auto;
}

.mobile-menu.is-open {
    transform: translateX(0);
}

.mobile-menu-content {
    padding: 2rem 1.5rem;
}

.mobile-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 1rem;
    font-weight: 500;
    color: var(--header-fg);
    text-decoration: none;
    padding: 0.875rem 1rem;
    border-radius: 4px;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition-base), color var(--transition-base);
}

.mobile-nav-link:hover,
.mobile-nav-link.is-active {
    background: var(--color-neutral-100);
    color: var(--color-cta);
}

.mobile-nav-expand i {
    font-size: 0.875rem;
    transition: transform var(--transition-base);
}

.mobile-nav-item-expandable.is-expanded .mobile-nav-expand i {
    transform: rotate(180deg);
}

.mobile-submenu {
    list-style: none;
    margin: 0;
    padding: 0 0 0 1rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-smooth);
}

.mobile-nav-item-expandable.is-expanded .mobile-submenu {
    max-height: 1000px;
}

.mobile-submenu-category {
    margin: 0.75rem 0;
}

.mobile-submenu-title {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--header-fg);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    transition: color var(--transition-base);
}

.mobile-submenu-title:hover {
    color: var(--color-cta);
}

.mobile-submenu-children {
    list-style: none;
    margin: 0.5rem 0 0 0;
    padding: 0;
}

.mobile-submenu-link {
    display: block;
    font-size: 0.875rem;
    color: var(--header-fg-secondary);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    transition: color var(--transition-base);
}

.mobile-submenu-link:hover {
    color: var(--color-cta);
}

.mobile-menu-cta {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--header-border);
}

.btn-cta-mobile {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--color-cta);
    color: #ffffff;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    padding: 1rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    width: 100%;
    transition: background var(--transition-base);
}

.btn-cta-mobile:hover {
    background: var(--color-cta-hover);
}

/* ============================================
   Responsive Breakpoints
   ============================================ */
@media (max-width: 1024px) {
    .header-nav,
    .btn-cta {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .header-content {
        grid-template-columns: 1fr auto;
    }

    .header-actions {
        justify-content: flex-end;
    }

    .top-bar-left {
        gap: 1rem;
    }

    .top-bar-link span,
    .top-bar-text span {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
        --header-height-top: 64px;
        --header-height-scrolled: 56px;
        --topbar-height: 40px;
    }

    .logo-image {
        height: 28px;
    }

    .site-header[data-header-state="scrolled"] .logo-image {
        height: 24px;
    }

    .top-bar-left {
        gap: 0.75rem;
    }

    .top-bar-link,
    .top-bar-text {
        font-size: 0.8125rem;
    }

    .mobile-menu {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .top-bar-text {
        display: none;
    }
}