/* RESPONSIVE CSS GRID & MENU OVERRIDES */

/* Small desktop & tablet landscape */
@media (max-width: 1200px) {
  :root {
    --section-padding-desktop: 64px 0;
  }
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }
}

/* Medium screens & iPad portrait */
@media (max-width: 992px) {
  /* Logo adjustment */
  .logo img {
    height: 40px;
  }

  /* Hamburger styling on dark homepage header */
  .homepage-header .hamburger span {
    background-color: #FFFFFF !important;
  }

  /* Mobile menu drawer styling */
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 280px;
    height: calc(100vh - 80px);
    background-color: var(--color-white);
    box-shadow: 4px 0 15px rgba(0,0,0,0.1);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    transition: var(--transition-normal);
    z-index: 999;
    display: block; /* Hiển thị dưới dạng block để cuộn dọc */
    overflow-y: auto;
  }

  .nav-menu.is-active {
    left: 0;
  }

  .nav-menu > ul {
    display: flex !important;
    flex-direction: column !important;
    align-items: flex-start !important;
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    list-style: none !important;
  }

  .nav-item {
    margin: 0;
    width: 100%;
    border-bottom: 1px solid #ECECEC;
  }

  /* Ghi đè màu chữ nav-link màu trắng trên mobile */
  .homepage-header .nav-link,
  .homepage-header.is-sticky .nav-link,
  .nav-link {
    padding: 14px 0;
    font-size: 1rem;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-secondary) !important;
    text-shadow: none !important;
  }

  /* Ghi đè màu chữ active (aria-current="page") cho trang chủ trên mobile không bị tàng hình */
  .homepage-header .nav-link[aria-current="page"],
  .homepage-header.is-sticky .nav-link[aria-current="page"] {
    color: var(--color-primary) !important; /* Đỏ active nổi bật */
  }

  /* Ẩn vệt gạch ngang đỏ thô dưới active link trên mobile menu */
  .homepage-header .nav-link[aria-current="page"]::after,
  .nav-link::after {
    display: none !important;
  }

  .homepage-header .nav-link:hover,
  .homepage-header.is-sticky .nav-link:hover,
  .nav-link:hover {
    color: var(--color-primary) !important;
  }

  /* Hamburger icon active transformation */
  .hamburger[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }

  .hamburger[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .hamburger[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  /* Mega menu mobile conversion */
  .mega-menu {
    position: static;
    transform: none;
    width: 100%;
    box-shadow: none;
    padding: 0 0 12px 12px;
    grid-template-columns: 1fr;
    gap: 12px;
    opacity: 1;
    visibility: visible;
    display: none; /* Ẩn mặc định, hiển thị khi click */
  }

  .nav-item:hover .mega-menu {
    display: none; /* Chặn hover trên mobile */
  }

  .nav-item.is-open .mega-menu {
    display: block; /* Mở khi click */
  }

  .mega-col-title {
    font-size: 0.8125rem;
    margin-top: 10px;
    margin-bottom: 6px;
  }

  /* Standard dropdown menu mobile conversion - Tối ưu nền và chữ */
  .homepage-header .dropdown-menu,
  .dropdown-menu {
    position: static;
    width: 100%;
    box-shadow: none !important;
    border: none !important;
    padding: 0 0 12px 15px !important;
    transform: none;
    opacity: 1;
    visibility: visible;
    display: none !important;
    background-color: transparent !important;
  }

  .nav-item:hover .dropdown-menu {
    display: none !important;
  }

  .nav-item.is-open .dropdown-menu {
    display: block !important;
  }

  .homepage-header .dropdown-menu li a,
  .dropdown-menu li a {
    color: var(--color-secondary) !important;
    padding: 8px 0 !important;
    font-size: 0.9rem !important;
    background: none !important;
    display: block;
  }

  .homepage-header .dropdown-menu li a:hover,
  .dropdown-menu li a:hover {
    color: var(--color-primary) !important;
  }

  /* Lock body scroll when mobile menu is active */
  body.lock-scroll {
    overflow: hidden;
  }

}

/* Mobile landscape & portrait */
@media (max-width: 768px) {
  :root {
    --section-padding-mobile: 40px 0;
  }

  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .section {
    padding: var(--section-padding-mobile);
  }
}

/* Very small screens */
@media (max-width: 480px) {
  .logo img {
    height: 36px;
  }
  .header-wrapper {
    height: 70px;
  }
  .nav-menu {
    top: 70px;
    height: calc(100vh - 70px);
  }
  .btn {
    padding: 10px 16px;
    font-size: 0.875rem;
  }
  .hero-content h2 {
    font-size: 1.8rem;
  }
  .cta-content h2 {
    font-size: 1.5rem;
  }
  .total-rolling-box h2 {
    font-size: 1.75rem;
  }
}