/* ===== Reset & Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", Tahoma, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #e0f2ff, #cce7ff);
  overflow-x: hidden;
}

/* Container chuẩn */
.container {
  width: 90%;
  margin: auto;
  max-width: 1200px;
}

/* ===== Header ===== */
.site-header {
  background: #ffffffcc;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #eee;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
}

.logo img {
  max-height: 50px;
  transition: transform 0.3s;
}

.logo img:hover {
  transform: scale(1.05);
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 25px;
}

.main-nav a {
  font-size: 18px;
  text-decoration: none;
  color: #333;
  font-weight: 500;
  position: relative;
  transition: color 0.3s;
}

.main-nav a::after {
  content: "";
  position: absolute;
  width: 0;
  height: 5px;
  bottom: -4px;
  left: 0;
  background: linear-gradient(90deg, #038ce7, #035ee7);
  transition: width 0.3s;
}

.main-nav a:hover {
  color: #038ce7;
}

.main-nav a:hover::after {
  width: 100%;
}

/* ===== Trang con trong main ===== */
main {
  min-height: 70vh;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

main.show {
  margin-bottom: 40px;
  opacity: 1;
  transform: translateY(0);
}

.page h1 {
  font-size: 2rem;

  margin-bottom: 20px;
}

.page p {
  margin-bottom: 15px;
  color: #555;
}

/* Nút đẹp */
.btn {
  display: inline-block;
  padding: 12px 24px;
  background: linear-gradient(135deg, #ff9966, #ff5e62);
  color: #fff;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.3s, box-shadow 0.3s;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
}

/* ===== Footer ===== */
.site-footer {
  background: linear-gradient(135deg, #2c3e50, #1a252f);
  color: #ddd;
  padding: 50px 0 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 40px;
  margin-bottom: 30px;
}

.footer-col h3 {
  color: #ff9966;
  margin-bottom: 15px;
  font-size: 18px;
  border-left: 4px solid #ff5e62;
  padding-left: 10px;
}

.footer-col p {
  font-size: 15px;
  line-height: 1.6;
  color: #ccc;
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col ul li {
  margin-bottom: 10px;
  font-size: 15px;
}

.footer-col ul a {
  text-decoration: none;
  color: #bbb;
  transition: color 0.3s, padding-left 0.3s;
}

.footer-col ul a:hover {
  color: #fff;
  padding-left: 5px;
}

.footer-logo {
  /* max-width: 150px; */
  margin-top: -100px;
}

.footer-bottom {
  text-align: center;
  padding-top: 15px;
  border-top: 1px solid #444;
  font-size: 14px;
  color: #aaa;
}

/* Ẩn submenu mặc định */
.main-nav ul li ul.submenu {
  display: none;
  position: absolute;
  background: #fff;
  padding: 10px 0;
  margin: 0;
  list-style: none;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  border-radius: 6px;
  min-width: 220px;
  z-index: 1000;
}

/* Hiện submenu khi hover */
.main-nav ul li:hover > ul.submenu {
  display: block;
}

/* Style cho các mục con */
.main-nav ul li ul.submenu li {
  position: relative;
}

.main-nav ul li ul.submenu li a {
  display: block;
  padding: 8px 15px;
  color: #333;
  text-decoration: none;
  transition: background 0.3s;
}

.main-nav ul li ul.submenu li a:hover {
  background: #f0f0f0;
  color: #0073e6;
}

/* Submenu cấp 2 (cho Quản lý Sản xuất) */
.main-nav ul li ul.submenu li ul.submenu {
  left: 100%;
  top: 0;
}
/* ===== Responsive Menu ===== */
.menu-toggle {
  display: none;
  font-size: 28px;
  cursor: pointer;
  background: none;
  border: none;
  color: #333;
  z-index: 2000;
}

/* Tablet & Mobile */
@media (max-width: 992px) {
  .main-nav {
    position: absolute;
    top: 100%;
    right: 0;
    background: #fff;
    width: 250px;
    display: none; /* ẩn mặc định */
    flex-direction: column;
    gap: 0;
    border: 1px solid #eee;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .main-nav li {
    width: 100%;
  }

  .main-nav a {
    display: block;
    border-bottom: 1px solid #f0f0f0;
  }

  /* Hiện menu khi bật */
  .main-nav.active {
    display: flex;
  }

  /* Hiện nút toggle */
  .menu-toggle {
    display: block;
  }

  /* Submenu dọc */
  .main-nav ul li ul.submenu {
    position: static;
    box-shadow: none;
    border-radius: 0;
    min-width: unset;
    padding-left: 15px;
  }

  .main-nav ul li:hover > ul.submenu {
    display: none; /* tắt hover */
  }

  .main-nav ul li.open > ul.submenu {
    display: block; /* mở bằng JS */
  }
}
/* Bọc nav */
.main-nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
  position: relative;
}

.main-nav a {
  text-decoration: none;
  padding: 12px 16px;
  display: block;
  color: #333;
  font-weight: 500;
  transition: color 0.3s;
}

.main-nav a:hover {
  color: #ff6b00;
}

/* Mega menu desktop */
.has-mega {
  position: left;
}

.has-mega .mega-menu {
  position: absolute;
  top: 100%;
  left: -140px;
  width: 700px;
  display: flex;
  gap: 30px;
  background: #fff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 999;
}

.has-mega:hover .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega-col h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--primary-color);
  border-bottom: 1px solid #eee;
  padding-bottom: 5px;
}
.mega-col ul {
  display: flex;
  flex-direction: column; /* ép các li nằm dọc */
  gap: 10px; /* khoảng cách giữa các item */
  padding: 0;
  margin: 0;
  list-style: none;
}

.mega-col li {
  margin-bottom: 8px;
  margin: 0; /* bỏ margin ngang */
}

.mega-col a {
  display: block;
  padding: 6px 10px;
  border-radius: 6px;
  background: #f9f9f9;
  transition: var(--transition);
}

.mega-col a strong {
  display: block;
  font-size: 15px;
  color: #333;
}

.mega-col a span {
  display: block;
  font-size: 13px;
  color: #777;
}

.mega-col a:hover {
  background: #ff6b00;
  color: #fff;
}

.mega-col a:hover strong,
.mega-col a:hover span {
  color: #fff;
}

/* =====================================
   Responsive
   ===================================== */
@media (max-width: 992px) {
  .main-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .main-nav li {
    width: 100%;
  }

  /* Mega menu chuyển thành accordion */
  .has-mega .mega-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 300px; /* Thu gọn cho vừa menu */
    display: flex;
    flex-direction: column; /* Đặt thành dọc */
    gap: 20px; /* Khoảng cách giữa các nhóm */
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 999;
  }
  .has-mega.active .mega-menu {
    display: block; /* Hiện khi click */
  }

  .mega-col {
    min-width: 100%;
  }

  .mega-col h4 {
    font-size: 16px;
    margin: 10px 0;
  }
}
@media (max-width: 992px) {
  /* Mega menu dạng accordion cho mobile */
  .has-mega {
    position: relative;
    width: 100%;
  }

  .has-mega .mega-menu {
    position: static;
    width: 100%;
    display: none;
    flex-direction: column;
    gap: 10px;
    background: #fff;
    padding: 10px 15px;
    box-shadow: none;
    border-top: 1px solid #eee;
    border-radius: 0;
    opacity: 1;
    visibility: visible;
    transform: none;

    /* Cho phép cuộn khi danh sách dài */
    max-height: 300px; /* bạn có thể chỉnh cao hơn nếu muốn */
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #ccc transparent;
  }

  /* Style thanh cuộn đẹp */
  .has-mega .mega-menu::-webkit-scrollbar {
    width: 6px;
  }
  .has-mega .mega-menu::-webkit-scrollbar-thumb {
    background-color: #ccc;
    border-radius: 3px;
  }

  .has-mega.open .mega-menu {
    display: flex;
  }

  .mega-col {
    width: 100%;
  }

  .mega-col h4 {
    font-size: 16px;
    margin: 8px 0;
    color: #333;
  }

  .mega-col ul {
    padding-left: 10px;
  }

  .mega-col a {
    background: transparent;
    padding: 6px 0;
  }

  .mega-col a:hover {
    background: none;
    color: #ff6b00;
  }
  /* Sửa lỗi chữ trắng trong mega menu */
  .mega-col a,
  .mega-col a strong,
  .mega-col a span {
    color: #333 !important; /* mặc định chữ tối, dễ đọc */
  }

  /* Khi hover hoặc active */
  .mega-col a:hover,
  .mega-col a.active {
    background: #fff !important; /* nền trắng */
    color: #0073e6 !important; /* chữ xanh */
  }

  .mega-col a:hover strong,
  .mega-col a.active strong {
    color: #0073e6 !important;
  }

  .mega-col a:hover span,
  .mega-col a.active span {
    color: #0073e6 !important;
  }
}