.main-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--white);
  box-shadow: var(--shadow);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 15px 24px;
  position: relative;
}

.logo-text {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 1px;
}

.nav-list {
  display: flex;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  position: relative;
  padding-bottom: 5px;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
}

.btn-cta {
  border-radius: var(--radius-btn);
  background: var(--primary);
  color: #fff;
  padding: 10px 22px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: var(--transition);
  font-size: 0.9rem;
  letter-spacing: 0.5px;
}

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

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text);
  cursor: pointer;
  padding: 0;
}

@media (max-width: 991px) {
  .mobile-toggle {
    display: block;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--white);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.4s ease-out;
    box-shadow: var(--shadow);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  }

  .nav-menu.active {
    max-height: 450px;
    padding: 16px 20px;
  }

  .nav-list {
    flex-direction: column;
    gap: 16px;
    align-items: center;
    padding-top: 10px;
  }

  .nav-link {
    font-size: 1rem;
    padding: 8px 0;
  }

  .nav-link.active::after {
    display: none;
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
  }
}

@media (max-width: 768px) {
  .header-container {
    padding: 12px 20px;
  }

  .logo-text {
    font-size: 1.6rem;
  }

  .btn-cta {
    padding: 8px 18px;
    font-size: 0.85rem;
  }

  .mobile-toggle {
    font-size: 1.6rem;
  }
}

/* ABC_MOBILE_MENU_GUARD: Đảm bảo Menu Mobile hoạt động hoàn hảo 100% trên mọi biến thể Header */
.main-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
}
.header-container {
    position: relative;
}
@media (min-width: 992px) {
    .mobile-toggle, #mobileToggle {
        display: none !important;
    }
}
@media (max-width: 991px) {
    .header-topbar {
        display: none !important;
    }
    .header-container {
        padding: 12px 16px !important;
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
        flex-wrap: nowrap !important;
        gap: 10px !important;
    }
    .header-actions {
        display: flex !important;
        align-items: center !important;
        gap: 10px !important;
        flex-shrink: 0 !important;
    }
    .header-actions .btn-cta {
        padding: 8px 14px !important;
        font-size: 0.85rem !important;
        white-space: nowrap !important;
    }
    .mobile-toggle, #mobileToggle {
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        width: 42px !important;
        height: 42px !important;
        background: var(--light, #f8fafc) !important;
        border: 1px solid rgba(15, 23, 42, 0.1) !important;
        border-radius: var(--radius-btn, 8px) !important;
        font-size: 1.25rem !important;
        color: var(--text, #1e293b) !important;
        cursor: pointer !important;
        z-index: 1002 !important;
        flex-shrink: 0 !important;
        transition: all 0.25s ease !important;
    }
    .mobile-toggle:hover, #mobileToggle:hover {
        color: var(--primary, #0f75bd) !important;
        border-color: var(--primary, #0f75bd) !important;
    }
    .nav-menu, #navMenu {
        display: block !important;
        position: absolute !important;
        top: 100% !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        background: var(--white, #ffffff) !important;
        max-height: 0 !important;
        overflow: hidden !important;
        opacity: 0 !important;
        visibility: hidden !important;
        padding: 0 20px !important;
        margin: 0 !important;
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.12) !important;
        border-top: 1px solid rgba(0, 0, 0, 0.06) !important;
        border-radius: 0 0 var(--radius, 12px) var(--radius, 12px) !important;
        transition: max-height 0.35s ease, opacity 0.25s ease, padding 0.3s ease, visibility 0.35s !important;
        z-index: 1001 !important;
    }
    .nav-menu.active, #navMenu.active {
        max-height: 480px !important;
        opacity: 1 !important;
        visibility: visible !important;
        padding: 16px 20px 22px !important;
        overflow-y: auto !important;
    }
    .nav-menu .nav-list, #navMenu .nav-list {
        display: flex !important;
        flex-direction: column !important;
        align-items: stretch !important;
        gap: 6px !important;
        width: 100% !important;
        margin: 0 !important;
        padding: 0 !important;
        list-style: none !important;
    }
    .nav-menu .nav-list li, #navMenu .nav-list li {
        width: 100% !important;
        margin: 0 !important;
    }
    .nav-menu .nav-link, #navMenu .nav-link {
        display: block !important;
        width: 100% !important;
        padding: 11px 16px !important;
        border-radius: 8px !important;
        text-align: left !important;
        font-size: 0.98rem !important;
        font-weight: 600 !important;
        color: var(--text, #1e293b) !important;
        text-decoration: none !important;
    }
    .nav-menu .nav-link:hover, .nav-menu .nav-link.active,
    #navMenu .nav-link:hover, #navMenu .nav-link.active {
        background: var(--primary-light, #f1f5f9) !important;
        color: var(--primary, #0f75bd) !important;
    }
}
@media (max-width: 480px) {
    .header-actions .btn-cta {
        display: none !important;
    }
}