@charset "utf-8";
.ui-filter.is-sticky {
	opacity: 1;
    padding: var(--space-inset-md);
}
.ui-filter__bar {
  display: flex;
  align-items: center;
  gap: var(--space-inline-sm);
  flex-wrap: wrap;
}

/* Search box */
.ui-filter-search {
  flex: 1;
  max-width: 450px;
}

/* Filter buttons group */
.ui-filter-controls {
  display: flex;
  align-items: center;
  gap: var(--space-inline-sm);
  flex-wrap: wrap;
}

/* ---------------------------------------------------------------
   3. Filter button
---------------------------------------------------------------- */
.ui-filter__trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--space-inline-sm);
  padding: var(--space-inset-xs);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-element);
  background: var(--bg-surface);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-default);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.2s, background 0.2s;
}

.ui-filter__btn-icon {
  font-size: 12px;
  transition: transform 0.2s;
}

.ui-filter__trigger[aria-expanded="true"] .ui-filter__btn-icon {
  transform: rotate(180deg);
}

.ui-link__icon {
  padding: var(--space-inset-xs);
  cursor: pointer;
  font-size: var(--font-size-base);
}

.ui-link__icon i {
  margin-right: 3px;
  background-image: var(--color-brand-gradient);
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

a.ui-link__icon:hover {
  text-decoration: none;
}

/* ---------------------------------------------------------------
   4. Filter dropdown panel
---------------------------------------------------------------- */
.ui-filter__group {
  position: relative;
}

.ui-filter__dropdown {
  position: absolute;
  top: calc(100% + var(--space-inset-2xs));
  left: 0;
  z-index: 500;
  background: var(--bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-element);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  width: max-content;
  min-width: 200px;
  padding: 15px;
}

.ui-filter__dropdown-search {
  margin-bottom: var(--space-stack-xs);
}

.ui-filter__dropdown-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 320px;
  overflow-y: auto;
}
.ui-filter__dropdown--single .ui-filter__dropdown-list {
	gap:0;
}

/* Individual flat item */
.ui-filter__dropdown-item {
  display: flex;
  align-items: center;
  padding: 0 0 6px 0;
  border-radius: var(--radius-element);
  cursor: pointer;
  transition: background 0.15s;
}

/* Disabled item (0 results) */
.ui-filter__dropdown-item--disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* Count text inside labels */
.ui-filter__count {
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: var(--font-weight-regular);
}

/* ---------------------------------------------------------------
   4b. Single-select dropdown variant
   單選下拉：無 checkbox、點選即選取；已選項整列底色 highlight
---------------------------------------------------------------- */
.ui-filter__dropdown--single {
  min-width: 180px;
  padding: 0;
}

.ui-filter__option {
  all: unset;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: var(--space-inline-xs);
  width: 100%;
  padding: var(--space-inset-xs) var(--space-inset-md);
  border-radius: var(--radius-element);
  font-size: var(--font-size-base);
  color: var(--color-text-default);
  cursor: pointer;
  transition: background 0.15s;
}

.ui-filter__option:hover,
.ui-filter__option:focus-visible {
  background: var(--bg-surface-soft);
}

/* 已選：整列底色 highlight */
.ui-filter__option.is-active {
  background: var(--color-brand-blue-100);
  font-weight: var(--font-weight-medium);
  color: var(--color-brand-blue-900);
}

.ui-filter__option[disabled],
.ui-filter__option--disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* ---------------------------------------------------------------
   5. Filter group (collapsible category)
---------------------------------------------------------------- */
.ui-filter__group-toggle {
  all: unset;
  width: 100%;
  display: flex;
  align-items: center;
  cursor: pointer;
  gap: var(--space-inline-sm);
}

.ui-filter__group-toggle > i {
  margin-left: auto;
}

.ui-filter__group-toggle i {
  background-image: var(--color-brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.ui-filter__group-toggle .ui-checkbox {
  pointer-events: auto;
}

.ui-filter__group-items {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: var(--space-inset-md);
  margin-top: 6px;
}

.ui-filter__group-items[hidden] {
  display: none;
}

.ui-filter__group-item {
  padding: 0 0 6px 0;
  border-radius: var(--radius-element);
  cursor: pointer;
  transition: background 0.15s;
}

/* ---------------------------------------------------------------
   6. Active filters row
---------------------------------------------------------------- */
.ui-filter__selected {
  display: flex;
  align-items: center;
  gap: var(--space-inline-sm);
  flex-wrap: wrap;
  padding: 0;
}

.ui-filter__selected .ui-tag__category::after {
  content: ":";
  color: var(--color-text-muted);
}

.ui-filter__selected .ui-tag-group {
  flex: 1;
}

/* "Clear All" button sizing */
.ui-filter__clear-all {
  flex-shrink: 0;
  padding: 6px var(--space-inset-md);
  font-size: 14px;
  white-space: nowrap;
}

/* 手機版隱藏 bar 內的 Clear All（改用 mobile 面板底部的 Clear All）
   僅當 bar 內含單選下拉（ui-filter__dropdown--single）時才隱藏，用 :has() 綁定該情境
   註：:has() 需較新瀏覽器（Chrome/Edge 105+、Safari 15.4+、Firefox 121+） */
@media (max-width: 580px) {
  .ui-filter__bar:has(.ui-filter__dropdown--single) .ui-link__icon {
    display: none;
  }
}

/* Mobile-only elements (hidden on desktop) */
.ui-filter-btn-mb,
.ui-filter__mobile-header,
.ui-filter__mobile-footer {
  display: none;
}

/* ---------------------------------------------------------------
   RWD
---------------------------------------------------------------- */
@media (max-width: 1600px) {
  .ui-filter-search {
    flex: 1 1 25%;
  }
  .ui-filter.is-sticky {
    padding: var(--space-inset-md) var(--space-gutter);
  }
}

@media (max-width: 1024px) {
  .ui-filter__bar {
    flex-wrap: wrap;
  }

  .ui-filter-search {
    flex: 1 1 50%;
  }
  .courses-search {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .ui-filter-search {
    flex: 1 1 100%;
  }

  .ui-filter-controls {
    width: 100%;
  }

  .ui-filter__dropdown {
    max-width: 90vw;
  }
  .ui-filter.is-sticky {
        padding: var(--space-inset-md) var(--space-inset-lg);
  }
}

@media (max-width: 580px) {
  .ui-filter.is-sticky {
        padding: var(--space-inset-md);
  }
  /* Show mobile filter trigger button */
  .ui-filter-btn-mb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-inline-sm);
    width: 100%;
    padding: 10px var(--space-inset-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-element);
    background: var(--bg-surface);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-default);
    cursor: pointer;
  }

  /* Hide the inline filter buttons row */
  .ui-filter-controls {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    z-index: 1100;
    background: var(--color-grey-100);
    flex-direction: column;
    align-items: stretch;
    flex-wrap: nowrap;
    gap: 0;
    overflow-y: auto;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.2);
    padding: 0;
  }

  .ui-filter-controls.is-open {
    display: flex;
  }

  /* Mobile panel header */
  .ui-filter__mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px var(--space-inset-md);
    border-bottom: 3px solid var(--color-brand-blue-900);
    position: sticky;
    top: 0;
    background: var(--color-white);
    z-index: 1;
    flex-shrink: 0;
  }

  .ui-filter__mobile-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-brand-blue-900);
  }

  .ui-filter__mobile-close {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 18px;
    color: var(--color-text-default);
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-element);
    background-image: var(--color-brand-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  /* Each top-level filter group → accordion row */
  .ui-filter-controls > .ui-filter__group {
    position: static;
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
  }

  /* Trigger button → full-width row (no button outline) */
  .ui-filter-controls > .ui-filter__group > .ui-filter__trigger {
    width: 100%;
    border: none;
    border-radius: 0;
    padding: var(--space-inset-xs) var(--space-inset-md);
    background: transparent;
    justify-content: flex-start;
    font-weight: var(--font-weight-medium);
    color: var(--color-brand-blue-900);
  }

  .ui-filter-controls > .ui-filter__group > .ui-filter__trigger .ui-filter__btn-icon {
    margin-left: auto;
  }

  /* Dropdown panel → inline (not floating) */
  .ui-filter-controls > .ui-filter__group > .ui-filter__dropdown {
    position: static;
    width: 100%;
    border: none;
    border-top: 1px solid var(--color-border);
    border-radius: 0;
    box-shadow: none;
    background: var(--color-white);
    max-width: 100%;
    padding: var(--space-inset-md);
    box-sizing: border-box;
  }
  .ui-filter-controls > .ui-filter__group > .ui-filter__dropdown.ui-filter__dropdown--single {
    padding: 0;
  }
  .ui-filter-controls > .ui-filter__group > .ui-filter__dropdown .ui-filter__dropdown-list {
    max-height: none;
  }

  /* Mobile panel footer */
  .ui-filter__mobile-footer {
    display: flex;
    gap: var(--space-inline-lg);
    padding: var(--space-inset-md) var(--space-inset-lg);
    border-top: 1px solid var(--color-border);
    position: sticky;
    bottom: 0;
    background: var(--bg-surface);
    flex-shrink: 0;
    margin-top: auto;
  }

  .ui-filter__mobile-clear-all {
    flex: 1;
    padding: 10px;
    border: 2px solid transparent;
    border-radius: var(--radius-pill);
    background:
      linear-gradient(var(--color-white), var(--color-white)) padding-box,
      var(--color-brand-gradient) border-box;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-brand-blue-600);
    cursor: pointer;
  }

  .ui-filter__mobile-apply {
    flex: 1;
    padding: 10px;
    border: 2px solid transparent;
    border-radius: var(--radius-pill);
    background:
      linear-gradient(transparent, transparent) padding-box,
      var(--color-brand-gradient) border-box;
    color: var(--color-white);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    cursor: pointer;
  }

  /* Backdrop overlay */
  .ui-mobile-filter-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1090;
  }

  .ui-mobile-filter-overlay[hidden] {
    display: none;
  }
}

/* ---------------------------------------------------------------
   Filter bar ≤580px override
   搜尋列 + 篩選連結 同列顯示，篩選鈕改為 icon+文字連結樣式
---------------------------------------------------------------- */
@media (max-width: 580px) {
  /* 同列不換行 */
  .ui-filter__bar {
    flex-wrap: nowrap;
    align-items: center;
  }

  /* 搜尋欄填滿剩餘空間，取消最大寬度限制 */
  .ui-filter__bar .courses-search {
    flex: 1;
    min-width: 0;
    max-width: none;
  }

  /* 篩選鈕：覆寫全寬 block 樣式，改為 inline icon+文字連結 */
  .ui-filter__bar .ui-filter-btn-mb {
    width: auto;
    flex-shrink: 0;
    padding: var(--space-inset-2xs) var(--space-inset-2xs);
    border: none;
    background: transparent;
    border-radius: 0;
    color: var(--color-brand-blue-600);
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
    justify-content: flex-end;
  }

  /* Icon 使用品牌漸層色 */
  .ui-filter__bar .ui-filter-btn-mb i {
    background-image: var(--color-brand-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
}