/* ==========================================================================
   Layout: Sticky Header, Accessible Mega Menu, Mobile Drawer, Footer, Floating & Sticky Bar
   ========================================================================== */

/* Header */
.header {
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  gap: 24px;
  position: relative;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--primary-red);
  text-transform: uppercase;
  flex-shrink: 0;
}

.logo img {
  height: 64px;
  width: auto;
  border-radius: 6px;
}

.logo-wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.logo-wordmark small {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.8px;
}

/* Primary Nav + Mega Menu */
.primary-nav {
  align-self: stretch;
  display: flex;
  align-items: stretch;
}

.nav-links {
  display: flex;
  align-items: stretch;
  gap: 24px;
  font-weight: 600;
  font-size: 0.95rem;
}

.nav-item {
  position: relative;
  display: flex;
  align-items: stretch;
}

.nav-item.has-mega {
  position: static;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 0 6px;
  color: var(--text-main);
  white-space: nowrap;
}

.nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 3px;
  bottom: 0;
  left: 0;
  background-color: var(--premium-gold);
  transition: width 0.22s ease, opacity 0.16s ease;
}

.nav-item.has-mega > .nav-link::before {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -7px;
  width: 12px;
  height: 12px;
  background: var(--white);
  border-top: 2px solid var(--primary-red);
  border-left: 2px solid var(--primary-red);
  transform: translateX(-50%) rotate(45deg);
  opacity: 0;
  pointer-events: none;
  z-index: 1201;
  transition: opacity 0.16s ease;
}

.nav-item:hover > .nav-link,
.nav-item:focus-within > .nav-link,
.nav-link.is-active {
  color: var(--primary-red);
}

.nav-item:hover > .nav-link::after,
.nav-item:focus-within > .nav-link::after,
.nav-link.is-active::after {
  width: 100%;
}

.nav-item.has-mega:hover > .nav-link::after,
.nav-item.has-mega:focus-within > .nav-link::after,
.nav-item.has-mega.is-open > .nav-link::after {
  opacity: 0;
}

.nav-item.has-mega:hover > .nav-link::before,
.nav-item.has-mega:focus-within > .nav-link::before,
.nav-item.has-mega.is-open > .nav-link::before {
  opacity: 1;
}

.nav-caret {
  width: 15px;
  height: 15px;
  transition: transform 0.2s ease;
}

.nav-item:hover > .nav-link .nav-caret,
.nav-item.is-open > .nav-link .nav-caret {
  transform: rotate(180deg);
}

/* Mega Dropdown Panel (Container-Aligned Connected Panel) */
.mega-dropdown {
  position: absolute;
  top: 100%;
  left: 24px;
  right: 24px;
  width: auto;
  background: var(--white);
  border-top: 2px solid var(--primary-red);
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  border-radius: 0 0 16px 16px;
  box-shadow: 0 24px 48px -8px rgba(15, 23, 42, 0.22);
  padding: 26px 28px 22px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.16s ease, visibility 0.16s ease;
  z-index: 1200;
}

.nav-item.has-mega:hover > .mega-dropdown,
.nav-item.has-mega:focus-within > .mega-dropdown,
.nav-item.has-mega.is-open > .mega-dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mega-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.mega-grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
}

.mega-grid--1 {
  grid-template-columns: 1fr;
}

.mega-col-title {
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--primary-red);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.mega-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mega-list--cols-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 40px;
}

.mega-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-main);
  padding: 6px 8px;
  border-radius: 6px;
}

.mega-list a:hover,
.mega-list a:focus-visible {
  background: var(--bg-light);
  color: var(--primary-red);
  padding-left: 12px;
}

.mega-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 99px;
  background: rgba(200, 16, 46, 0.08);
  color: var(--primary-red);
}

.mega-footer-bar {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.875rem;
}

.mega-footer-bar a {
  font-weight: 700;
  color: var(--primary-red);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.header-hotline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-main);
  white-space: nowrap;
}

.header-hotline svg,
.header-hotline i {
  color: var(--primary-red);
}

.header-zalo-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid #0068FF;
  color: #0068FF;
  font-weight: 700;
  font-size: 0.875rem;
  background: #EEF5FF;
  white-space: nowrap;
}

.header-zalo-btn:hover {
  background: #0068FF;
  color: var(--white);
}

.lucide-zalo {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

/* Mobile Toggle Button */
.mobile-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--white);
  color: var(--text-main);
  cursor: pointer;
}

/* Mobile Off-Canvas Drawer */
.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(2px);
  z-index: 1500;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s;
}

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

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(360px, 88vw);
  background: var(--white);
  z-index: 1600;
  transform: translateX(100%);
  transition: transform 0.28s ease;
  display: flex;
  flex-direction: column;
  box-shadow: -12px 0 32px rgba(15, 23, 42, 0.16);
}

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

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
}

.mobile-drawer-close {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-light);
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.mobile-drawer-body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 16px 20px 32px;
}

.mobile-nav-group {
  border-bottom: 1px solid var(--border-color);
  padding: 10px 0;
}

.mobile-nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.mobile-nav-link {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-main);
  padding: 8px 0;
  flex: 1;
}

.mobile-sub-toggle {
  width: 36px;
  height: 36px;
  border: none;
  background: var(--bg-light);
  border-radius: 6px;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.mobile-sub-list {
  display: none;
  padding: 6px 0 8px 14px;
  border-left: 2px solid var(--primary-red);
  margin: 4px 0 6px;
}

.mobile-sub-list.is-open {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-sub-list a {
  font-size: 0.92rem;
  color: var(--text-muted);
  padding: 4px 0;
}

.mobile-sub-list a:hover {
  color: var(--primary-red);
}

.mobile-drawer-cta {
  padding: 16px 20px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-light);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Breadcrumb */
.breadcrumb-wrap {
  padding: 14px 0;
  background: var(--white);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  justify-content: flex-start;
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--primary-red);
}

.breadcrumb .current {
  color: var(--text-main);
  font-weight: 600;
}

.breadcrumb .separator {
  color: #CBD5E1;
}

/* Unified Footer */
.footer {
  background: #0F172A;
  color: var(--white);
  padding: 80px 0 24px;
  margin-top: auto;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-red), var(--premium-gold));
}

.footer-grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1fr;
  gap: 44px;
  margin-bottom: 56px;
}

.footer-col-about .footer-logo {
  display: inline-flex;
  margin-bottom: 20px;
  align-items: center;
  gap: 14px;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.8px;
  color: var(--white);
}

.footer-col-about .footer-logo img {
  height: 56px;
  width: auto;
  border-radius: 8px;
}

.footer-col-about p {
  color: #94A3B8;
  line-height: 1.7;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.footer-contact-info {
  margin-top: 20px;
}

.footer-contact-item {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  align-items: flex-start;
}

.footer-contact-icon {
  color: var(--primary-red);
  margin-top: 3px;
  flex-shrink: 0;
}

.footer-contact-text {
  color: #94A3B8;
  font-size: 0.93rem;
  line-height: 1.55;
}

.footer-contact-text strong {
  color: var(--white);
  display: block;
  margin-bottom: 2px;
}

.footer-contact-text a {
  color: #CBD5E1;
}

.footer-contact-text a:hover {
  color: var(--premium-gold);
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-social a:hover {
  background: var(--primary-red);
  border-color: var(--primary-red);
  transform: translateY(-2px);
}

.footer-col h4 {
  font-size: 1.1rem;
  margin-bottom: 20px;
  font-weight: 700;
  color: var(--white);
  position: relative;
  padding-bottom: 12px;
}

.footer-col h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--primary-red);
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: #94A3B8;
  font-size: 0.93rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-links a:hover {
  color: var(--white);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: #94A3B8;
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-bottom-links a:hover {
  color: var(--white);
}

/* Desktop Floating Quick Contact */
.floating-cta {
  position: fixed;
  right: 20px;
  bottom: 28px;
  z-index: 950;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.floating-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 99px;
  color: var(--white);
  font-weight: 700;
  font-size: 0.88rem;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.25);
}

.floating-btn--zalo {
  background: #0068FF;
}

.floating-btn--call {
  background: var(--primary-red);
}

.floating-btn:hover {
  transform: translateY(-2px);
}

/* Mobile Sticky Bottom Bar */
.mobile-bottom-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: var(--white);
  box-shadow: 0 -4px 16px rgba(15, 23, 42, 0.12);
  border-top: 1px solid var(--border-color);
  z-index: 999;
}

.mobile-bar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  text-align: center;
}

.mobile-action {
  padding: 10px 4px;
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.78rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  border-right: 1px solid var(--border-color);
}

.mobile-action.call {
  background: var(--primary-red);
  color: var(--white);
  border: none;
}

@media (max-width: 1080px) {
  .primary-nav,
  .header-hotline,
  .header-zalo-btn {
    display: none;
  }
  .mobile-menu-toggle {
    display: inline-flex;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .header-container {
    min-height: 72px;
  }
  .logo img {
    height: 48px;
  }
  .logo-wordmark {
    font-size: 1rem;
  }
  .header-actions .btn-primary {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .floating-cta {
    display: none;
  }
  .mobile-bottom-bar {
    display: block;
  }
  body {
    padding-bottom: 64px;
  }
}