/* ====================
   導覽列 (Site Navigation)
   BEM 命名：site-nav / site-nav-mobile

   定位模式（皆為 fixed，固定在畫面上方跟著滑動）：
   - 預設（有顏色）：導覽列有背景色，頁面內容需用 margin-top / padding-top: var(--nav-height) 補償高度
   - body.transparent-nav（透明）：導覽列透明疊在內容上方，不需要補償高度
   ==================== */

/* ===== 1. 外層容器 ===== */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
  background-color: var(--white);
  transition:
    background-color 0.3s ease,
    background-image 0.3s ease;
}

/* 透明模式初始狀態：背景透明，捲動超過 100px 後由 JS 加上 is-solid 切換為白色背景 */
body.transparent-nav .site-nav:not(.is-solid) {
  background-color: transparent;
}

.site-nav.is-solid {
  background-color: var(--white);
}

/* ===== 2. 兩欄佈局（Logo 靠左 / 選單+Actions 靠右） ===== */

.site-nav__bar {
  position: relative;
  z-index: 3;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0;
}

.site-nav__start {
  flex-shrink: 0;
}

.site-nav__end {
  display: flex;
  align-items: stretch;
  flex: 1;
  gap: var(--spacing-4);
}

/* ===== 3. Logo ===== */

.site-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-brand img {
  width: 150px;
  height: auto;
}

/* ===== 4. 桌面選單 ===== */

.site-nav__menu {
  flex: 1;
  align-self: stretch;
  display: flex;
  justify-content: flex-end;
}

.site-nav__list {
  display: flex;
  align-items: stretch;
  list-style: none;
  padding-left: 0;
  margin: 0;
  height: 100%;
}

.site-nav__item {
  position: relative;
  display: flex;
  align-items: center;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  color: var(--gray-900);
  text-decoration: none;
  padding: 0 12px;
  height: 80px;
  transition:
    background-color 0.2s ease,
    color 0.3s ease;
}

.site-nav__link:hover {
  background-color: var(--gray-100);
}

.site-nav__link.is-active {
  color: var(--brand-1);
}

.site-nav__arrow {
  font-size: var(--font-size-heading-sm);
  transition: transform 0.2s ease;
}

.site-nav__item:hover > .site-nav__link > .site-nav__arrow {
  transform: rotate(180deg);
}

/* ===== 5. 下拉共用 ===== */

.site-nav__dropdown {
  position: absolute;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    visibility 0s linear 0.25s;
  pointer-events: none;
}

.site-nav__item:hover > .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    visibility 0s linear 0s;
  pointer-events: auto;
}

/* ===== 6. 單層下拉 ===== */

.site-nav__dropdown--single {
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 160px;
  background-color: var(--white);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  z-index: 1000;
}

.site-nav__item:hover > .site-nav__dropdown--single {
  transform: translateX(-50%) translateY(0);
}

.site-nav__dropdown-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.site-nav__dropdown-link {
  display: block;
  padding: 14px 20px;
  font-weight: 500;
  color: var(--gray-700);
  text-decoration: none;
  text-align: center;
  border-bottom: 1px solid var(--color-border-strong);
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

.site-nav__dropdown-link:hover {
  background-color: var(--gray-200);
  color: var(--gray-900);
}

.site-nav__dropdown-list > li:last-child > .site-nav__dropdown-link {
  border-bottom: none;
}

/* ===== 7. 多欄下拉 (Mega Menu) ===== */

.site-nav__item--mega {
  position: static;
}

.site-nav__dropdown--mega {
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  width: 100vw;
  background-color: var(--white);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  z-index: 1000;
}

.site-nav__item:hover > .site-nav__dropdown--mega {
  transform: translateX(-50%) translateY(0);
}

.site-nav__mega-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 190px));
  justify-content: center;
  gap: var(--spacing-7);
  max-width: 1320px;
  margin: 0 auto;
  padding: 30px 1rem;
}

.site-nav__mega-col {
  width: 100%;
}

.site-nav__mega-title {
  display: block;
  width: 100%;
  margin-top: 0;
  padding: 10px 8px;
  font-weight: 500;
  color: var(--gray-700);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border-default);
  transition: background-color 0.2s ease;
}

a.site-nav__mega-title:hover {
  background-color: var(--gray-200);
}

.site-nav__mega-list {
  flex-flow: column;
  margin-bottom: 0;
  padding-left: 0;
  list-style-type: none;
}

.site-nav__mega-list > li {
  border-bottom: 1px solid var(--color-border-strong);
  font-size: var(--font-size-caption);
}

.site-nav__mega-link {
  display: block;
  width: 100%;
  padding: 10px 0 10px 8px;
  color: var(--gray-700);
  text-decoration: none;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}

.site-nav__mega-link:hover {
  background-color: var(--gray-200);
  color: var(--gray-900);
}

/* ===== 8. 右側動作區 ===== */

.site-nav__actions {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: var(--spacing-3);
}

/* 搜尋按鈕 */
.site-nav__search {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  font-size: var(--font-size-caption);
  font-weight: normal;
}

.site-nav__search-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  background: none;
  border: none;
  padding: 0 12px;
  height: 80px;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  color: var(--gray-900);
  cursor: pointer;
  transition:
    background-color 0.2s ease,
    color 0.3s ease;
}

.site-nav__search-btn:hover {
  background-color: var(--gray-100);
}

/* 語系切換 */
.site-nav__lang {
  position: relative;
  display: flex;
  align-items: center;
  font-size: var(--font-size-caption);
  font-weight: normal;
}

.site-nav__lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  padding: 0 12px;
  height: 80px;
  cursor: pointer;
  color: var(--gray-900);
  transition:
    background-color 0.2s ease,
    color 0.3s ease;
}

.site-nav__lang-toggle:hover {
  background-color: var(--gray-100);
}

.site-nav__lang:hover > .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.site-nav__lang-dropdown {
  min-width: 80px;
}

.site-nav__lang:hover > .site-nav__lang-dropdown {
  transform: translateX(-50%) translateY(0);
}

.site-nav__lang:hover > .site-nav__lang-toggle > .site-nav__arrow {
  transform: rotate(180deg);
}

/* ===== 9. 漢堡按鈕 ===== */

.site-nav__hamburger {
  display: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--gray-200);
  border: none;
  padding: 0;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.site-nav__hamburger-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--gray-900);
  position: relative;
  transition: background-color 0.3s ease;
}

.site-nav__hamburger-line::before,
.site-nav__hamburger-line::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--gray-900);
  position: absolute;
  left: 0;
  transition: background-color 0.3s ease;
}

.site-nav__hamburger-line::before {
  top: -6px;
}

.site-nav__hamburger-line::after {
  top: 6px;
}

/* ===== 10. 手機版 Drawer（多層面板滑動） ===== */

/* DaisyUI Drawer 覆寫 */
.drawer-toggle:checked ~ .drawer-side > .drawer-overlay {
  background-color: rgba(0, 0, 0, 0.7);
}

/* 多層面板容器 */
.site-nav-mobile {
  position: relative;
  width: 85vw;
  max-width: 400px;
  height: 100%;
  overflow: hidden;
  background: linear-gradient(180deg, var(--brand-1) 0%, var(--brand-2) 100%);
}

/* 單一面板 */
.site-nav-mobile__panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition:
    transform 0.3s ease,
    visibility 0s linear 0.3s;
  visibility: hidden;
  background: linear-gradient(180deg, var(--brand-1) 0%, var(--brand-2) 100%);
}

.site-nav-mobile__panel.is-active {
  transform: translateX(0);
  visibility: visible;
  transition:
    transform 0.3s ease,
    visibility 0s linear 0s;
}

.site-nav-mobile__panel.is-exit {
  transform: translateX(-100%);
  visibility: visible;
  transition:
    transform 0.3s ease,
    visibility 0s linear 0s;
}

/* 面板 Header */
.site-nav-mobile__panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 20px 30px 20px;
  min-height: 80px;
}

.site-nav-mobile__panel-title {
  color: var(--white);
  font-size: var(--font-size-body);
  font-weight: var(--fw-medium);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

/* 返回按鈕 */
.site-nav-mobile__back-btn {
  background: transparent;
  border: none;
  color: var(--white);
  padding: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  font-size: var(--font-size-heading-sm);
}

/* 關閉按鈕 */
.site-nav-mobile__close {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--brand-3);
  border: none;
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: var(--font-size-heading-sm);
  margin-left: auto;
}

/* 面板 Body */
.site-nav-mobile__panel-body {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

/* 選單導航 */
.site-nav-mobile__nav {
  flex: 1;
}

.site-nav-mobile__nav-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
}

.site-nav-mobile__nav-link {
  display: block;
  color: var(--white);
  text-decoration: none;
  padding: 18px 20px;
  text-align: center;
  cursor: pointer;
}

.site-nav-mobile__nav-link:hover {
  color: var(--white);
  background-color: rgba(255, 255, 255, 0.1);
}

/* 有子選單的項目 */
.site-nav-mobile__nav-item {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
}

.site-nav-mobile__nav-item:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.site-nav-mobile__nav-item .site-nav-mobile__nav-link:hover {
  background-color: transparent;
}

.site-nav-mobile__nav-arrow {
  position: absolute;
  right: 20px;
  color: var(--white);
  font-size: var(--font-size-heading-sm);
}

/* ===== 10-1. 手機版 Footer 功能列 ===== */

.site-nav-mobile__panel-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 15px 20px;
  gap: var(--spacing-5);
}

.site-nav-mobile__footer-btn {
  background: transparent;
  border: none;
  color: var(--white);
  font-weight: var(--fw-medium);
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  cursor: pointer;
  padding: 8px 12px;
}

.site-nav-mobile__footer-btn:hover {
  opacity: 0.8;
}

.site-nav-mobile__footer-divider {
  width: 1px;
  height: 20px;
  background-color: var(--white);
  opacity: 0.5;
}

/* ===== 11. RWD 斷點 ===== */

@media (max-width: 1199.98px) {
  .site-nav__bar {
    padding: 10px 0;
  }

  .site-nav__menu {
    display: none !important;
  }

  .site-nav__search,
  .site-nav__lang {
    display: none !important;
  }

  .site-nav__end {
    justify-content: flex-end;
  }

  .site-nav__hamburger {
    display: flex;
  }

  .site-brand img {
    width: 120px;
  }
}

@media (min-width: 1200px) {
  .site-nav__hamburger {
    display: none !important;
  }

  .drawer-side {
    display: none !important;
  }
}