/*
 * 右側完整網站選單：無障礙與 RWD 修正
 * 請於 main.css 後載入。
 */

.bk-menubtn {
  border: 0;
  border-radius: 0;
  font-family: inherit;
  line-height: inherit;
  text-align: center;
}

.bk-menubtn:hover,
.bk-menubtn:focus-visible {
  color: #fff;
  text-decoration: none;
}

.bk-menubtn:focus,
.bk-menubtn:focus-visible,
.sidenav a:focus,
.sidenav a:focus-visible,
.sidenav button:focus,
.sidenav button:focus-visible {
  outline: 3px dotted #e71357 !important;
  outline-offset: 3px;
  box-shadow: none !important;
}

.sidenav {
  /* 不再由 JS 寫入固定 50%，改由 class 與斷點控制 */
  width: min(50vw, 720px);
  max-width: 100%;
  visibility: hidden;
  transform: translateX(100%);
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  transition: transform 0.35s ease, visibility 0s linear 0.35s;
}

.sidenav.is-open {
  visibility: visible;
  transform: translateX(0);
  transition: transform 0.35s ease;
}

body.sidenav-open {
  overflow: hidden;
}

.sidenav .closebtn {
  min-width: 44px;
  min-height: 44px;
}

/* 平板與手機：選單使用全寬，避免只有半個螢幕造成文字過窄 */
@media (max-width: 992px) {
  .sidenav {
    width: 100vw;
  }

  .bk-menubtn {
    padding: 18px 22px;
    min-width: 72px;
    min-height: 72px;
  }

  #menu-top {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  #menu-middle {
    padding-left: 1rem;
    padding-right: 1rem;
    padding-bottom: 2rem;
  }

  .sidenav a,
  .sidenav strong {
    padding-left: 1rem;
    padding-right: 1rem;
    overflow-wrap: anywhere;
  }
}

/* 極窄手機 */
@media (max-width: 575.98px) {
  .sidenav {
    padding-top: 56px;
  }

  .sidenav .closebtn {
    top: 4px;
    right: 12px;
  }

  #menu-top a {
    display: inline-block;
    margin-bottom: 0.5rem;
  }

  .tree li {
    line-height: 1.6;
  }
}

/* 尊重使用者減少動態效果設定 */
@media (prefers-reduced-motion: reduce) {
  .sidenav {
    transition: none;
  }
}


/* 漢堡 menu 按鈕取得鍵盤焦點時，沿用全站紅色焦點框 */
#menubtn:focus,
#menubtn:focus-visible {
  outline: 3px dotted #e71357 !important;
  outline-offset: -4px;
  box-shadow: none !important;
}

/* 關閉按鈕的紅色焦點框避免被既有樣式蓋掉 */
#closebutton:focus,
#closebutton:focus-visible {
  outline: 3px dotted #e71357 !important;
  outline-offset: 2px;
  box-shadow: none !important;
}