/* ==========================================================================
   tabs.css — 分頁導覽、立場獨立頁、肌群篩選面板、統一播放鈕
   ========================================================================== */

/* --- TabNav（Primer UnderlineNav，內嵌於 header 同一列） ------------------ */

.TabNav {
  min-width: 0;
  margin-left: var(--base-size-8);
}

.TabNav__inner {
  display: flex;
  gap: var(--base-size-4);
  overflow-x: auto;
  scrollbar-width: none;
}

.TabNav__inner::-webkit-scrollbar {
  display: none;
}

.TabNav__item {
  display: flex;
  align-items: center;
  gap: var(--base-size-8);
  height: var(--header-height);
  padding: 0 var(--base-size-12);
  font-size: 14px;
  white-space: nowrap;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--fgColor-muted);
  transition: color 0.12s ease, border-color 0.12s ease;
}

.TabNav__item:hover {
  color: var(--fgColor-default);
  border-bottom-color: var(--borderColor-default);
}

.TabNav__item.is-selected {
  color: var(--fgColor-default);
  font-weight: 600;
  border-bottom-color: #fd8c73;
}

:root[data-theme="dark"] .TabNav__item.is-selected {
  border-bottom-color: #f78166;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .TabNav__item.is-selected {
    border-bottom-color: #f78166;
  }
}

.TabNav__item svg {
  color: var(--fgColor-muted);
}

.TabNav__item.is-selected svg {
  color: var(--fgColor-default);
}

/* --- 立場獨立頁 ---------------------------------------------------------- */

.StancePage {
  margin: 0 auto;
  padding: var(--base-size-32) var(--base-size-24) var(--base-size-40);
}

.StancePage__intro {
  max-width: 74ch;
  margin-bottom: var(--base-size-32);
}

.StancePage__intro h2 {
  display: flex;
  align-items: center;
  gap: var(--base-size-8);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.StancePage__intro h2 svg {
  color: var(--fgColor-done);
}

.StancePage__intro p {
  margin-top: var(--base-size-12);
  font-size: 15px;
  line-height: 1.7;
  color: var(--fgColor-muted);
}

.StancePage__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(340px, 100%), 1fr));
  gap: var(--base-size-16);
}

/* 立場頁的卡片內容全展開，不用折疊 */
.StancePage .StanceCard details {
  display: block;
}

.StancePage__outro {
  max-width: 74ch;
  margin-top: var(--base-size-32);
  padding: var(--base-size-16);
  background-color: var(--bgColor-muted);
  border: 1px solid var(--borderColor-default);
  border-radius: var(--borderRadius-medium);
  font-size: 14px;
  line-height: 1.7;
}

.StancePage__outro strong {
  color: var(--fgColor-default);
}

/* --- 肌群篩選面板 -------------------------------------------------------- */

.MusclePanel {
  margin-top: var(--base-size-16);
  background-color: var(--bgColor-muted);
  border: 1px solid var(--borderColor-default);
  border-radius: var(--borderRadius-medium);
  overflow: hidden;
}

.MusclePanel__head {
  display: flex;
  align-items: center;
  gap: var(--base-size-8);
  width: 100%;
  padding: var(--base-size-12);
  background: none;
  border: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--fgColor-muted);
  text-align: left;
}

.MusclePanel__head:hover {
  background-color: var(--bgColor-neutral-muted);
  color: var(--fgColor-default);
}

.MusclePanel__head > span:first-of-type {
  flex: 1;
}

.MusclePanel__chevron {
  display: inline-flex;
  transition: transform 0.15s ease;
}

.MusclePanel.is-open .MusclePanel__chevron {
  transform: rotate(90deg);
}

.MusclePanel__body {
  display: none;
  padding: 0 var(--base-size-12) var(--base-size-12);
  max-height: 46vh;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.MusclePanel.is-open .MusclePanel__body {
  display: block;
}

.MuscleGroup__title {
  padding: var(--base-size-8) 0 var(--base-size-4);
  font-size: 11px;
  font-weight: 600;
  color: var(--fgColor-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.MuscleChips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--base-size-4);
}

.MuscleChip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  font-size: 12px;
  line-height: 18px;
  color: var(--fgColor-default);
  background-color: var(--bgColor-default);
  border: 1px solid var(--borderColor-default);
  border-radius: var(--borderRadius-full);
  white-space: nowrap;
}

.MuscleChip:hover {
  border-color: var(--borderColor-accent-emphasis);
  color: var(--fgColor-accent);
}

.MuscleChip.is-active {
  color: var(--fgColor-onEmphasis);
  background-color: var(--fgColor-accent);
  border-color: var(--fgColor-accent);
}

.MuscleChip__n {
  font-size: 10px;
  font-variant-numeric: tabular-nums;
  opacity: 0.6;
}

.MusclePanel__clear {
  width: 100%;
  margin-top: var(--base-size-12);
  justify-content: center;
  font-size: 12px;
  padding: 4px 8px;
}

/* 單元／動作內可點擊的肌群標籤 */
.Label--muscle {
  cursor: pointer;
}

.Label--muscle:hover {
  color: var(--fgColor-accent);
  border-color: var(--borderColor-accent-emphasis);
}

.Label--muscle.is-active {
  color: var(--fgColor-onEmphasis);
  background-color: var(--fgColor-accent);
  border-color: var(--fgColor-accent);
}

/* --- 統一的播放鈕 -------------------------------------------------------- */

.PlayBtn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: var(--borderRadius-medium);
  background-color: var(--bgColor-danger-muted);
  border: 1px solid color-mix(in srgb, var(--fgColor-danger) 26%, transparent);
  color: var(--fgColor-danger);
  transition: background-color 0.12s ease, border-color 0.12s ease;
}

.PlayBtn--sm {
  width: 28px;
  height: 28px;
}

a:hover > .PlayBtn,
.PlayBtn:hover {
  background-color: color-mix(in srgb, var(--fgColor-danger) 18%, transparent);
  border-color: var(--fgColor-danger);
}

.PlayBtn--disabled {
  background-color: var(--bgColor-neutral-muted);
  border-color: var(--borderColor-default);
  border-style: dashed;
  color: var(--fgColor-muted);
  pointer-events: none;
}

/* 中等寬度：數字先讓位給搜尋框 */
@media (max-width: 1100px) {
  .TabNav__item .Counter {
    display: none;
  }
}

/* 窄螢幕：分頁只留圖示，文字用 title 提示 */
@media (max-width: 700px) {
  .TabNav {
    margin-left: 0;
  }

  .TabNav__item {
    padding: 0 10px;
    gap: 0;
  }

  .TabNav__label {
    display: none;
  }
}

@media (max-width: 767px) {

  .StancePage {
    padding: var(--base-size-24) var(--base-size-16);
  }

  .StancePage__intro h2 {
    font-size: 19px;
  }
}