/* 預設收合 */
#main-menu {
  display: none;
}

/* 當 checkbox 被勾選時展開 */
#main-menu-state:checked ~ #main-menu,
#main-menu-state:checked + label + a + #main-menu {
  display: block;
}

/* === Mega Menu 展開控制 === */
.has-mega {
  position: static; /* 讓 .mega-menu 不被限制寬度 */
}

.has-mega:hover .mega-menu,
.has-mega:focus-within .mega-menu {
  display: block;
}

/* === Mega Menu 主體 === */
.mega-menu {
  position: fixed;
  left: 0;
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
  display: none;
  z-index: 9999;
  background: #f9f9f9;
  box-sizing: border-box;
}


.mega-menu a,
.mega-menu li,
.mega-menu ul {
  margin: 0;
  padding: 0;
  list-style: none;
  text-decoration: none;
  display: block;
  position: static;
  float: none !important;
}


/* === 容器與列 === */
.mega-menu__container {
  display: flex;
  justify-content: end;
}

.mega-menu__row {
  display: flex;
  flex-wrap: wrap;
  margin-bottom: 1rem;

  justify-content: space-between;
}

.mega-menu__row:nth-of-type(3) {
  margin-bottom: 0;
}

.mega-menu__row:nth-of-type(4) {
  margin-top: 0;
}


/* === 欄位 === */
.mega-menu__column {
  flex: 0 0 calc(23% - 1rem); /* 四欄，每欄約 25% 減去間距 */
  min-width: 220px;
  display: flex;
  flex-direction: column;
  padding: 1rem 2rem;
  margin-right: 0rem;
  margin-bottom: 0rem;

}

.mega-menu__column--narrow {
  flex: 0 0 calc(20% - 1rem);
  min-width: 100px;
  background-color: #f2f3f3;
}

.mega-menu__column h4 {
  font-size: 1rem;
  margin: 20px 0 10px 0;
  color: #333;
  line-height: 25px;
}

/* === 清單項目（防止污染） === */
.mega-menu__list,
.mega-menu__column ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mega-menu__item,
.mega-menu__column ul li {
  display: block;
  float: none !important;
  margin-bottom: 0.5rem;
  position: static !important;
  line-height: 23px;
}

.mega-menu__item a,
.mega-menu__column ul li a {
  text-decoration: none;
  color: #333;
  font-size: 0.95rem;
  display: block;
}

.mega-menu__item a:hover,
.mega-menu__column ul li a:hover {
  color: #c00;
}

/* === 圖片欄位 === */
.mega-menu__column--image {
  flex: 0 0 calc(35% - 1rem); /* 與其他欄位一致 */
  min-width: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0rem; /* ✅ 加入上下左右間距 */
  box-sizing: border-box;
}

.mega-menu__column:not(:last-child) {
  border-bottom: 1px solid #ddd;
}


/* === 行動裝置支援 === */
@media (max-width: 768px) {

  /* 📌 主選單排版 */
  #main-menu {
    display: flex;
    flex-direction: column;
    width: 100%;
  }

  #main-menu > li {
    width: 100%;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #ddd;
  }

  #main-menu > li > a {
    display: block;
    width: 100%;
    font-size: 1rem;
    color: #333;
    text-decoration: none;
  }

  #main-menu > li > a:hover {
    color: #c00;
  }

  /* 📌 Mega Menu 主體 */
  .mega-menu {
    position: static;
    width: 100%;
    display: block;
  }

  .has-mega.active .mega-menu {
    display: block;
  }

  .mega-menu__container {
    display: flex;
    flex-direction: column;
  }

  /* 📌 Mega Menu 欄位排版 */
  .mega-menu__column,
  .mega-menu__column--image,
  .mega-menu__column--narrow {
    width: 100%;
    flex: none;
    margin: 0;
  }

  .mega-menu__column--image img {
    max-width: 100%;
    height: auto;
    margin: 0 auto;
  }

  /* 📌 h4 摺疊控制 */
  .mega-menu__column h4 {
    cursor: pointer;
    position: relative;
    padding-right: 1.5em;
    font-size: 1rem;
    margin: 20px 0 10px 0;
    color: #333;
    line-height: 25px;
  }

  .mega-menu__column h4::after {
    content: "＋";
    position: absolute;
    right: 0.5em;
    top: 0;
    font-weight: bold;
  }

  .mega-menu__column h4.active::after {
    content: "－";
  }

  /* 📌 h4 下選單預設收合 */
  .mega-menu__column ul {
    display: none;
    margin-top: 0.5em;
    list-style: none;
    padding: 0;
  }

  .mega-menu__column h4.active + ul {
    display: block;
  }
}