/* ========== 共用 Header ==========
   ★ 版面闊度 / 左右留白 / 上下距離全部跟 base.css 嘅 --app-max / --app-gutter / --app-gap
   （呢度唔再定義 .app-main） */
.site-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 冇指定位置時：右上角浮動 */
.site-header--floating {
  position: fixed;
  top: calc(12px + env(safe-area-inset-top));
  right: calc(12px + env(safe-area-inset-right));
  z-index: 50;
}

/* --- 語言選擇器 --- */
.lang {
  position: relative;
}

.lang__btn {
  height: 34px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.lang__btn:hover {
  border-color: var(--color-primary);
}

.lang__btn:focus-visible,
.theme-switch:focus-visible,
.lang__option:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.lang__btn>svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.lang__chevron {
  width: 14px !important;
  height: 14px !important;
  color: var(--color-text-muted);
  transition: transform var(--transition);
}

.lang.is-open .lang__chevron {
  transform: rotate(180deg);
}

.lang__menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 140px;
  padding: 6px;
  list-style: none;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: var(--shadow-pop);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 60;
}

.lang.is-open .lang__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang__option {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 10px;
  font-size: 14px;
  text-align: left;
  background: transparent;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.lang__option:hover {
  background: var(--color-input-bg);
}

.lang__option[aria-checked="true"] {
  color: var(--color-primary);
  font-weight: 600;
}

.lang__option[aria-checked="true"]::after {
  content: "✓";
}

/* --- 明暗模式切換 --- */
.theme-switch {
  position: relative;
  width: 64px;
  height: 34px;
  flex-shrink: 0;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.theme-switch:hover {
  border-color: var(--color-primary);
}

.theme-switch__knob {
  position: absolute;
  top: 2.5px;
  left: 3px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(135deg, #f59e0b, #f97316);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), background 0.3s ease;
}

.theme-switch__icon {
  position: absolute;
  top: 50%;
  width: 16px;
  height: 16px;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  transition: color var(--transition);
  pointer-events: none;
}

.theme-switch__icon--sun {
  left: 8px;
  color: #fff;
}

.theme-switch__icon--moon {
  right: 8px;
}

.theme-switch[aria-checked="true"] .theme-switch__knob {
  transform: translateX(29px);
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.theme-switch[aria-checked="true"] .theme-switch__icon--sun {
  color: var(--color-text-muted);
}

.theme-switch[aria-checked="true"] .theme-switch__icon--moon {
  color: #fff;
}

/* ========== App Header（登入後嘅頁面） ==========
   ★ 離頂 = --app-gap（同 .app-main 離 header 一樣） */
.app-header {
  width: 100%;
  max-width: var(--app-max);
  margin: 0 auto;
  padding: calc(var(--app-gap) + env(safe-area-inset-top)) var(--app-gutter) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.app-brand {
  display: inline-flex;
  align-items: center;
  height: 34px;
  flex-shrink: 0;
}

.app-brand__img {
  display: block;
  height: 34px;
  /* 同原本 logo 一樣高 */
  width: auto;
  /* 跟比例 ≈ 84px */
  object-fit: contain;
}

.app-header__right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.app-user {
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-user[hidden] {
  display: none;
}

.app-user__name {
  font-weight: 600;
  font-size: 14px;
}

/* ★ 頭像 + 名：撳入設定頁 */
.app-user__link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 2px 12px 2px 2px;
  color: inherit;
  text-decoration: none;
  border: 1.5px solid transparent;
  border-radius: 999px;
  transition: border-color var(--transition), background var(--transition);
}

.app-user__link:hover,
.app-user__link[aria-current="page"] {
  border-color: var(--color-primary);
  background: var(--color-surface);
}

.app-user__link:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.avatar {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  flex-shrink: 0;
  overflow: hidden;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.btn-ghost {
  height: 34px;
  padding: 0 14px;
  font-size: 13px;
  font-weight: 600;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}

.btn-ghost:hover {
  border-color: var(--color-danger);
  color: var(--color-danger);
}

@media (max-width: 520px) {
  .app-user__name {
    display: none;
  }

  .app-user__link {
    padding: 2px;
  }
}