/* ==========================================================================
   Header & Navigation Styling - Lanbang B2B Theme
   ========================================================================== */

/* 1. Top Bar */
.top-bar {
  background-color: var(--dark);
  color: #c0c0c0;
  font-size: 0.82rem;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.top-bar .slogan {
  letter-spacing: 0.5px;
}

.top-bar .top-right {
  display: flex;
  gap: 20px;
}

.top-bar .top-right a {
  color: #e0e0e0;
}

.top-bar .top-right a:hover {
  color: var(--primary);
}

/* 2. Site Header (Main Nav) */
.site-header {
  background-color: var(--white);
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: 1000;
  transition: all 0.35s ease;
}

.site-header.is-sticky {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  animation: slideDownHeader 0.3s ease forwards;
}

@keyframes slideDownHeader {
  from { transform: translateY(-100%); }
  to { transform: translateY(0); }
}

.site-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

/* Logo */
.site-logo a {
  display: flex;
  align-items: center;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--dark);
  letter-spacing: 1px;
}

.site-logo a span {
  color: var(--primary);
  margin-left: 4px;
}

.site-logo img {
  max-height: 48px;
  width: auto;
}

/* Navigation List */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-list > li {
  position: relative;
}

.nav-list > li > a {
  font-family: var(--font-heading);
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--dark);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 28px 0;
  display: inline-block;
  position: relative;
}

.nav-list > li > a::after {
  content: '';
  position: absolute;
  bottom: 20px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: var(--transition);
}

.nav-list > li:hover > a,
.nav-list > li.current-menu-item > a {
  color: var(--primary);
}

.nav-list > li:hover > a::after,
.nav-list > li.current-menu-item > a::after {
  width: 100%;
}

/* Dropdown Sub-menus */
.nav-list .sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--white);
  min-width: 230px;
  box-shadow: var(--shadow-lg);
  border-top: 3px solid var(--primary);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  padding: 10px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(15px);
  transition: all 0.25s ease;
  z-index: 100;
}

.nav-list li:hover > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-list .sub-menu li {
  position: relative;
}

.nav-list .sub-menu li a {
  display: block;
  padding: 10px 20px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--gray-700);
  transition: var(--transition);
}

.nav-list .sub-menu li a:hover {
  background-color: var(--primary-light);
  color: var(--primary);
  padding-left: 25px;
}

/* Header Action CTA */
.header-action {
  display: flex;
  align-items: center;
  margin-left: 25px;
}

.header-action .btn {
  padding: 10px 22px;
  font-size: 0.85rem;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.mobile-menu-btn span {
  display: block;
  height: 3px;
  width: 100%;
  background-color: var(--dark);
  border-radius: 3px;
  transition: var(--transition);
}

/* Responsive Mobile Navigation */
@media (max-width: 992px) {
  .top-bar .slogan {
    display: none;
  }

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

  .header-action {
    display: none;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: var(--white);
    box-shadow: -5px 0 25px rgba(0, 0, 0, 0.15);
    padding: 80px 25px 40px;
    flex-direction: column;
    align-items: flex-start;
    transition: right 0.35s ease;
    overflow-y: auto;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 0;
  }

  .nav-list > li {
    width: 100%;
    border-bottom: 1px solid var(--gray-300);
  }

  .nav-list > li > a {
    padding: 15px 0;
    width: 100%;
  }

  .nav-list .sub-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border-top: none;
    background: var(--gray-100);
    padding-left: 15px;
  }
}