/* ============================================
   HEADER.CSS - Header & Navigation Styles
   Hebei Cangtie Industrial Co., Ltd.
============================================ */

/* --- Site Header --- */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-sticky);
  transition:
    background var(--transition-base),
    box-shadow var(--transition-base),
    backdrop-filter var(--transition-base);
}

/* Transparent when at top */
#site-header.header-transparent {
  background: transparent;
}

/* Frosted glass when scrolled */
#site-header.header-scrolled {
  background: rgba(10, 20, 40, 0.82);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 2px 32px rgba(0, 0, 0, 0.25);
}

/* --- Top Bar --- */
.header-topbar {
  /* background: var(--clr-primary-dark); */
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  overflow: hidden;
  max-height: 40px;
  transition:
    max-height 0.4s ease,
    opacity 0.4s ease,
    padding 0.4s ease;
  opacity: 1;
}

.header-scrolled .header-topbar {
  max-height: 0;
  opacity: 0;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-md);
  height: 40px;
  padding: 0 var(--page-padding);
  max-width: var(--max-width);
  margin: 0 auto;
}

.topbar-contacts {
  display: flex;
  align-items: center;
  gap: var(--sp-lg);
}

.topbar-contact-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.75);
  transition: color var(--transition-fast);
}

.topbar-contact-item i {
  font-size: 0.75rem;
  color: var(--clr-accent);
}

.topbar-contact-item:hover {
  color: #fff;
}

.topbar-social {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}

.topbar-social-link {
  width: 26px;
  height: 26px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.08);
  transition: all var(--transition-fast);
}

.topbar-social-link:hover {
  background: var(--clr-accent);
  color: #fff;
  transform: translateY(-2px);
}

/* --- Main Navigation Bar --- */
.header-mainbar {
  padding: 0 var(--page-padding);
}

.mainbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-lg);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0;
  height: 72px;
}

/* --- Logo --- */
.header-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  text-decoration: none;
  flex-shrink: 0;
}

.header-logo img {
  height: 60px;
  width: auto;
  object-fit: contain;
  /* filter: brightness(1.1); */
  /* filter: invert(100%) brightness(1);
  transition: filter var(--transition-fast); */
}
/* 
.header-transparent .header-logo img {
  filter: brightness(10) saturate(0);
}

.header-scrolled .header-logo img {
  filter: brightness(1.2);
} */

/* --- Main Navigation --- */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-xs);
  flex: 1;
  flex-wrap: wrap;
  justify-content: center;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 14px;
  font-size: 1rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.nav-link i {
  font-size: 0.7rem;
  transition: transform var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--clr-accent);
  /* background: rgba(255, 255, 255, 0.1); */
}

.nav-item:hover .nav-link > i {
  transform: rotate(180deg);
}

/* Underline indicator */
.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--clr-accent);
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: calc(100% - 28px);
}

/* --- Dropdown Menu --- */
.dropdown {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(10, 40, 100, 0.15), 0 4px 16px rgba(10, 40, 100, 0.08);
  min-width: 620px;
  padding: 15px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  border: 1px solid rgba(10, 75, 143, 0.1);
  display: grid;
  grid-template: repeat(6, auto) / 1fr 1fr;
  gap: 15px;
  /* Top accent stripe */
  overflow: hidden;
}

.dropdown::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  width: 12px;
  height: 12px;
  background: #fff;
  border-left: 1px solid rgba(10, 75, 143, 0.1);
  border-top: 1px solid rgba(10, 75, 143, 0.1);
  transform: translateX(-50%) rotate(45deg);
}

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

/* --- Dropdown Item --- */
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px 10px 14px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #334155;
  border-radius: var(--radius-md);
  border-left: 3px solid transparent;
  /* Default card-like background */
  background: #f8fafd;
  border: 1px solid rgba(10, 75, 143, 0.07);
  position: relative;
  overflow: hidden;
  letter-spacing: 0.01em;
  line-height: 1.3;
  transition:
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    font-weight var(--transition-fast);
}

/* Arrow icon - hidden by default, shown on hover */
.dropdown-item::after {
  content: "\f054"; /* fa-chevron-right */
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  font-size: 0.58rem;
  color: var(--clr-primary);
  margin-left: auto;
  opacity: 0;
  transform: translateX(-6px);
  flex-shrink: 0;
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast);
}

.dropdown-item:hover {
  background: linear-gradient(90deg, rgba(10, 75, 143, 0.07) 0%, rgba(10, 75, 143, 0.02) 100%);
  color: var(--clr-primary);
  border-color: rgba(10, 75, 143, 0.18);
  transform: translateX(3px);
  box-shadow: 0 2px 12px rgba(10, 75, 143, 0.1);
  font-weight: 600;
}

.dropdown-item:hover::before {
  opacity: 1;
  background: linear-gradient(135deg, var(--clr-accent), #f0a500);
  transform: scale(1.25);
  box-shadow: 0 0 0 3px rgba(240, 165, 0, 0.2);
}

.dropdown-item:hover::after {
  opacity: 1;
  transform: translateX(0);
}

/* --- Header Actions (right side) --- */
.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-shrink: 0;
}

.header-action-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.95rem;
}

.header-action-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: scale(1.05);
}

.header-cta-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: linear-gradient(135deg, var(--clr-accent), #e09500);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  font-family: var(--font-body);
  transition: all var(--transition-base);
  box-shadow: 0 4px 16px rgba(240, 165, 0, 0.35);
}

.header-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(240, 165, 0, 0.45);
}

/* --- Search Overlay --- */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: calc(var(--z-sticky) + 50);
  background: rgba(5, 16, 36, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transform: translateY(-100%);
  transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.search-overlay-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px var(--page-padding);
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.search-field-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: 14px 20px;
}

.search-field-wrapper i {
  color: rgba(255, 255, 255, 0.5);
  font-size: 1.1rem;
}

#search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 1.1rem;
  color: #fff;
}

#search-input::placeholder {
  color: rgba(255, 255, 255, 0.4);
}
.search-field-wrapper form,
.search-field-wrapper form input{
  width:100%;
}

.search-close-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.7);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.search-close-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: rotate(90deg);
}

/* --- Mobile Menu Toggle --- */
.mobile-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  flex-shrink: 0;
}

.menu-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.mobile-menu-btn.open .menu-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-menu-btn.open .menu-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-menu-btn.open .menu-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* --- Mobile Navigation Drawer --- */
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: min(380px, 90vw);
  height: 100vh;
  background: var(--clr-bg-dark);
  z-index: calc(var(--z-sticky) + 100);
  overflow-y: auto;
  transition: right var(--transition-slow);
  padding: var(--sp-xl) var(--sp-lg);
  box-shadow: var(--shadow-xl);
}

.mobile-nav-drawer.open {
  right: 0;
}

.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: calc(var(--z-sticky) + 99);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

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

.mobile-drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-xl);
}

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

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.mobile-drawer-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.07);
  margin: var(--sp-sm) 0;
}

.mobile-drawer-contacts {
  margin-top: var(--sp-xl);
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}

.mobile-contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.6);
}

.mobile-contact-item i {
  color: var(--clr-accent);
  width: 18px;
  text-align: center;
}

/* --- Responsive Header --- */
@media (max-width: 1205px) {
  .main-nav {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .topbar-contacts {
    gap: var(--sp-md);
  }
  .topbar-contact-item:last-child {
    display: none;
  }
}

@media (max-width: 768px) {
  .mainbar-inner {
    height: 62px;
  }
  .header-logo img {
    height: 50px;
  }
  .topbar-contacts {
    display: none;
  }
  .header-cta-btn span {
    display: none;
  }
  .header-cta-btn {
    padding: 10px 14px;
  }
  .header-cta-btn i {
    font-size: 1rem;
  }
  .mobile-drawer-head img{
    width: auto;
    height: 50px !important;
  }
}

@media (max-width: 480px) {
  .header-cta-btn {
    display: none;
  }
}