/* ═══════════════════════════════════════════════════════════
   IJS Website - Layout
   Header, mega menu, footer, grid system
   ═══════════════════════════════════════════════════════════ */

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

.header.scrolled {
    height: var(--header-height-scrolled);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-header);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--space-8);
}

/* ── Logo ── */
.header-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    z-index: var(--z-header);
}

.header-logo img,
.header-logo svg {
    height: 40px;
    width: auto;
    transition: height var(--transition-slow);
}

.header.scrolled .header-logo img,
.header.scrolled .header-logo svg {
    height: 32px;
}

/* Logo switch: white for transparent header, dark for scrolled header */
.header-logo-dark {
    display: none !important;
}

.header.scrolled .header-logo-white {
    display: none !important;
}

.header.scrolled .header-logo-dark {
    display: block !important;
}

/* ── Navigation ── */
.header-nav {
    display: flex;
    align-items: center;
    height: 100%;
}

.nav-list {
    display: flex;
    align-items: center;
    height: 100%;
    gap: 0;
}

.nav-item {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
}

.nav-link {
    display: flex;
    align-items: center;
    height: 100%;
    padding: 0 var(--space-5);
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    color: white;
    transition: color var(--transition-fast);
    white-space: nowrap;
}

.header.scrolled .nav-link {
    color: var(--ijs-dark);
}

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

/* ── Mega Menu ── */
.mega-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: white;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: var(--z-dropdown);
}

.header.scrolled ~ .mega-menu,
.header.scrolled .mega-menu {
    top: var(--header-height-scrolled);
}

.nav-item:hover .mega-menu,
.nav-item:focus-within .mega-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mega-menu-inner {
    display: flex;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-6) var(--space-8);
    gap: var(--space-8);
}

.mega-menu-image {
    flex: 0 0 240px;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.mega-menu-image img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    border-radius: var(--radius-lg);
}

.mega-menu-links {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.mega-menu-title {
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--ijs-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-2);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--ijs-border-light);
}

.mega-menu-link {
    display: flex;
    align-items: center;
    padding: var(--space-2) var(--space-3);
    color: var(--ijs-text);
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.mega-menu-link:hover {
    background: var(--ijs-bg-gray);
    color: var(--ijs-primary);
    padding-left: var(--space-5);
}

.mega-menu-desc {
    flex: 1;
    font-size: var(--text-sm);
    color: var(--ijs-text-light);
    line-height: var(--leading-relaxed);
    padding: var(--space-3) 0;
}

/* ── Header Right (search + language + mobile toggle + contact CTA) ── */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    z-index: var(--z-header);
}

/* Header Contact CTA Button */
.header-contact-btn {
    display: none;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: var(--ijs-primary);
    color: #fff;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.header-contact-btn:hover {
    background: var(--ijs-primary-dark);
    color: #fff;
    transform: translateY(-1px);
}
.header-contact-btn i { font-size: 16px; }
@media (min-width: 1025px) {
    .header-contact-btn { display: flex; }
}

/* Header Platform Button */
.header-platform-btn {
    display: none;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: transparent;
    color: var(--ijs-primary);
    border: 1.5px solid var(--ijs-primary);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.header-platform-btn:hover {
    background: var(--ijs-primary);
    color: #fff;
    transform: translateY(-1px);
}
.header-platform-btn i { font-size: 16px; }
@media (min-width: 1025px) {
    .header-platform-btn { display: flex; }
}
/* Scrolled header: adjust platform btn colors for dark bg */
.header.scrolled .header-platform-btn {
    color: var(--ijs-primary);
    border-color: var(--ijs-primary);
}
.header.scrolled .header-platform-btn:hover {
    background: var(--ijs-primary);
    color: #fff;
}

.header-search-btn,
.header-lang-btn,
.header-mobile-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    color: white;
    transition: all var(--transition-fast);
}

.header.scrolled .header-search-btn,
.header.scrolled .header-lang-btn,
.header.scrolled .header-mobile-btn {
    color: var(--ijs-dark);
}

.header-search-btn:hover,
.header-lang-btn:hover,
.header-mobile-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

.header.scrolled .header-search-btn:hover,
.header.scrolled .header-lang-btn:hover,
.header.scrolled .header-mobile-btn:hover {
    background: var(--ijs-bg-gray);
}

.header-lang-btn {
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    width: auto;
    padding: 0 var(--space-3);
}

.header-mobile-btn {
    display: none;
}

/* ── Search Overlay ── */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: var(--z-overlay);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 20vh;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-overlay-inner {
    width: 90%;
    max-width: 700px;
    transform: translateY(-20px);
    transition: transform var(--transition-normal);
}

.search-overlay.active .search-overlay-inner {
    transform: translateY(0);
}

.search-overlay-input {
    width: 100%;
    padding: var(--space-5) var(--space-6);
    font-size: var(--text-2xl);
    background: white;
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.search-overlay-input:focus {
    outline: none;
}

.search-overlay-close {
    position: absolute;
    top: var(--space-8);
    right: var(--space-8);
    color: white;
    font-size: var(--text-3xl);
    cursor: pointer;
}

/* ── Mobile Navigation Drawer ── */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 85%;
    max-width: 400px;
    height: 100vh;
    background: white;
    z-index: var(--z-modal);
    overflow-y: auto;
    transition: right var(--transition-slow);
    padding: var(--space-20) var(--space-6) var(--space-6);
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.mobile-nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-close {
    position: absolute;
    top: var(--space-5);
    right: var(--space-5);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-2xl);
    color: var(--ijs-text);
}

.mobile-nav-item {
    border-bottom: 1px solid var(--ijs-border-light);
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) 0;
    font-size: var(--text-lg);
    font-weight: var(--weight-medium);
    color: var(--ijs-dark);
}

.mobile-nav-children {
    display: none;
    padding-left: var(--space-4);
    padding-bottom: var(--space-3);
}

.mobile-nav-children.active {
    display: block;
}

.mobile-nav-child {
    padding: 0;
}

.mobile-nav-child a {
    display: block;
    padding: var(--space-2) 0;
    min-height: 44px;
    display: flex;
    align-items: center;
    color: var(--ijs-text-light);
    font-size: var(--text-base);
}

.mobile-nav-child a:hover {
    color: var(--ijs-primary);
}

/* ── Footer ── */
.footer {
    background: var(--ijs-dark-alt, #12151f);
    color: rgba(255, 255, 255, 0.6);
    padding: var(--space-8) 0 0;
}

.footer-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-8);
}

/* Footer Main */
.footer-main {
    padding-bottom: var(--space-4);
}

.footer-logo img,
.footer-logo svg {
    height: 28px;
    width: auto;
    opacity: 0.9;
}

.footer-brand-desc {
    margin-top: var(--space-4);
    font-size: var(--text-sm);
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.5);
}

.footer-contact-info {
    margin-top: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.45);
}

.footer-contact-inline {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.footer-contact-info i {
    font-size: 13px;
    margin-right: 4px;
    opacity: 0.6;
}

/* Footer Nav Columns */
.footer-nav-title {
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    margin-bottom: var(--space-3);
    letter-spacing: 0.01em;
}

.footer-nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-nav-list li {
    margin-bottom: var(--space-2);
}

.footer-nav-list a {
    display: inline-block;
    padding: var(--space-1) 0;
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer-nav-list a:hover {
    color: var(--ijs-primary);
}

/* Footer CTA Bar */
.footer-cta-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-5) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-cta-info {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    flex-wrap: wrap;
}

.footer-cta-label {
    font-size: var(--text-base);
    font-weight: var(--weight-semibold);
    color: rgba(255, 255, 255, 0.85);
}

.footer-cta-contact {
    display: flex;
    gap: var(--space-5);
}

.footer-cta-contact a {
    color: rgba(255, 255, 255, 0.55);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer-cta-contact a:hover {
    color: var(--ijs-primary);
}

.footer-cta-contact i {
    font-size: 14px;
    margin-right: 4px;
}

.footer-cta-btn {
    flex-shrink: 0;
}

/* Footer Bottom */
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) 0;
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.35);
}

.footer-bottom-links {
    display: flex;
    gap: var(--space-4);
}

.footer-bottom-links a {
    color: rgba(255, 255, 255, 0.35);
    font-size: var(--text-xs);
}

.footer-bottom-links a:hover {
    color: rgba(255, 255, 255, 0.7);
}

/* ── Scroll to Top ── */
.scroll-top {
    position: fixed;
    bottom: var(--space-8);
    right: var(--space-8);
    width: 48px;
    height: 48px;
    background: var(--ijs-primary);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-normal);
    z-index: var(--z-sticky);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    background: var(--ijs-primary-dark);
    color: white;
    transform: translateY(-3px);
}

/* ── Grid System ── */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}