/* ============================================
   tad-slide.css v1.1.0
   WCAG 2.3 AAA Compliant Responsive Carousel
   ============================================ */

/* ── 容器 ── */
.tad-slide {
  position: relative;
  width: 100%;
  overflow: hidden;
  margin: 0 auto;
  background: #fcfcfc;
  isolation: isolate;
}

/* ── 投影片清單 ── */
.tad-slide__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
}

/* ── 單張投影片 ── */
.tad-slide__item {
  position: absolute;
  inset: 0;
  width: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.6s ease, transform 0.6s ease, visibility 0.6s;
  will-change: opacity, transform;
  pointer-events: none;
}

.tad-slide__item.is-active {
  position: relative;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  z-index: 2;
}

.tad-slide__item.is-prev {
  position: absolute;
  opacity: 0;
  visibility: hidden;
  z-index: 1;
}

/* ── 圖片 ── */
.tad-slide__item img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 0;
  -webkit-user-drag: none;
  user-select: none;
}

/* ── 說明文字 ── */
.tad-slide__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.75rem 1rem;
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ============================================
   過場特效
   ============================================ */

[data-tad-effect="fade"] .tad-slide__item { transform: none; }

[data-tad-effect="slide"] .tad-slide__item         { transform: translateX(100%); }
[data-tad-effect="slide"] .tad-slide__item.is-active { transform: translateX(0); }
[data-tad-effect="slide"] .tad-slide__item.is-prev  { transform: translateX(-100%); }

[data-tad-effect="zoom"] .tad-slide__item          { transform: scale(1.08); }
[data-tad-effect="zoom"] .tad-slide__item.is-active { transform: scale(1); }
[data-tad-effect="zoom"] .tad-slide__item.is-prev  { transform: scale(0.95); }

[data-tad-effect="flip"] { perspective: 1200px; }
[data-tad-effect="flip"] .tad-slide__item          { transform: rotateY(90deg); }
[data-tad-effect="flip"] .tad-slide__item.is-active { transform: rotateY(0deg); }
[data-tad-effect="flip"] .tad-slide__item.is-prev  { transform: rotateY(-90deg); }

[data-tad-effect="cube"] { perspective: 1000px; transform-style: preserve-3d; }
[data-tad-effect="cube"] .tad-slide__item          { transform: rotateX(90deg); transform-origin: bottom center; }
[data-tad-effect="cube"] .tad-slide__item.is-active { transform: rotateX(0deg); }
[data-tad-effect="cube"] .tad-slide__item.is-prev  { transform: rotateX(-90deg); transform-origin: top center; }

/* ============================================
   進度條
   ============================================ */
.tad-slide__progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 4px;
  width: 0%;
  background: #ffdd00;
  z-index: 10;
  transition: width linear;
}
.tad-slide--paused .tad-slide__progress {
  transition: none;
}

/* ============================================
   通用按鈕樣式
   ============================================ */
.tad-slide__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0.3rem 0.75rem;
  border: 2px solid transparent;
  border-radius: 4px;
  background: #333;
  color: #fff;
  font-size: 0.875rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  white-space: nowrap;
  line-height: 1;
}
.tad-slide__btn:hover { background: #555; }
.tad-slide__btn:focus-visible {
  outline: 3px solid #ffdd00;
  outline-offset: 2px;
  border-color: #ffdd00;
  background: #444;
}

/* ============================================
   模式 A：bottom（下方控制列）
   ============================================ */
.tad-slide--nav-bottom .tad-slide__controls-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 0.5rem;
  background: #1a1a1a;
  flex-wrap: wrap;
}

/* 暫停按鈕（底部列版） */
.tad-slide--nav-bottom .tad-slide__pause {
  background: #c0392b;
  font-weight: 600;
}
.tad-slide--nav-bottom .tad-slide__pause:hover { background: #e74c3c; }
.tad-slide--nav-bottom .tad-slide__pause[aria-pressed="false"] { background: #27ae60; }
.tad-slide--nav-bottom .tad-slide__pause[aria-pressed="false"]:hover { background: #2ecc71; }

/* 分頁點（底部列版） */
.tad-slide--nav-bottom .tad-slide__pager {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.tad-slide--nav-bottom .tad-slide__pager-btn {
  position: relative;
  display: block;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 2px solid transparent;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}
.tad-slide--nav-bottom .tad-slide__pager-btn::after {
  content: "";
  position: absolute;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #aaa;
  transition: background 0.2s;
}
.tad-slide--nav-bottom .tad-slide__pager-btn[aria-current="true"]::after,
.tad-slide--nav-bottom .tad-slide__pager-btn:hover::after { background: #ffdd00; }
.tad-slide--nav-bottom .tad-slide__pager-btn[aria-current="true"] { border-color: #ffdd00; }
.tad-slide--nav-bottom .tad-slide__pager-btn:focus-visible {
  outline: 3px solid #ffdd00;
  outline-offset: 2px;
}

/* ============================================
   模式 B：sides（左右浮動箭頭）
   ============================================ */

/* 左右箭頭：浮動在輪播圖內部左右側 */
.tad-slide--nav-sides .tad-slide__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  /* 半透明深色背景 */
  background: rgba(0, 0, 0, 0.45);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  min-width: 48px;
  min-height: 48px;
  padding: 0;
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
  /* 滑入顯示 */
  opacity: 0;
  transition: opacity 0.25s, background 0.2s, border-color 0.2s;
}
/* 滑鼠進入容器才顯示箭頭 */
.tad-slide--nav-sides:hover .tad-slide__arrow,
.tad-slide--nav-sides:focus-within .tad-slide__arrow {
  opacity: 1;
}
.tad-slide--nav-sides .tad-slide__arrow:hover {
  background: rgba(0, 0, 0, 0.75);
  border-color: #ffdd00;
}
.tad-slide--nav-sides .tad-slide__arrow:focus-visible {
  opacity: 1;
  outline: 3px solid #ffdd00;
  outline-offset: 2px;
  border-color: #ffdd00;
  background: rgba(0, 0, 0, 0.75);
}
.tad-slide--nav-sides .tad-slide__arrow--prev { left: 0.75rem; }
.tad-slide--nav-sides .tad-slide__arrow--next { right: 0.75rem; }

/* sides 模式的暫停按鈕：浮動在右下角 */
.tad-slide--nav-sides .tad-slide__pause-float {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  z-index: 20;
  background: rgba(0, 0, 0, 0.55);
  border: 2px solid rgba(255, 255, 255, 0.25);
  border-radius: 4px;
  width: auto;
  min-width: 44px;
  min-height: 44px;
  padding: 0.25rem 0.6rem;
  font-size: 0.78rem;
  color: #fff;
  opacity: 0;
  transition: opacity 0.25s, background 0.2s;
}
.tad-slide--nav-sides:hover .tad-slide__pause-float,
.tad-slide--nav-sides:focus-within .tad-slide__pause-float {
  opacity: 1;
}
.tad-slide--nav-sides .tad-slide__pause-float:hover {
  background: rgba(0, 0, 0, 0.85);
}
.tad-slide--nav-sides .tad-slide__pause-float:focus-visible {
  opacity: 1;
  outline: 3px solid #ffdd00;
  outline-offset: 2px;
}
.tad-slide--nav-sides .tad-slide__pause-float[aria-pressed="false"] {
  border-color: #27ae60;
  color: #2ecc71;
}

/* ============================================
   模式 C：none（僅暫停按鈕浮動在右下角）
   ============================================ */
.tad-slide--nav-none .tad-slide__pause-float {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  z-index: 20;
  background: rgba(0, 0, 0, 0.55);
  border: 2px solid rgba(255, 255, 255, 0.25);
  border-radius: 4px;
  min-width: 44px;
  min-height: 44px;
  padding: 0.25rem 0.6rem;
  font-size: 0.78rem;
  color: #fff;
  opacity: 0;
  transition: opacity 0.25s, background 0.2s;
}
.tad-slide--nav-none:hover .tad-slide__pause-float,
.tad-slide--nav-none:focus-within .tad-slide__pause-float {
  opacity: 1;
}
.tad-slide--nav-none .tad-slide__pause-float:hover {
  background: rgba(0, 0, 0, 0.85);
}
.tad-slide--nav-none .tad-slide__pause-float:focus-visible {
  opacity: 1;
  outline: 3px solid #ffdd00;
  outline-offset: 2px;
}
.tad-slide--nav-none .tad-slide__pause-float[aria-pressed="false"] {
  border-color: #27ae60;
  color: #2ecc71;
}

/* ============================================
   減少動態效果（WCAG 2.3.3 AAA）
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .tad-slide__item,
  .tad-slide__progress {
    transition: opacity 0.1s ease !important;
    transform: none !important;
  }
  .tad-slide--nav-sides .tad-slide__arrow,
  .tad-slide--nav-sides .tad-slide__pause-float,
  .tad-slide--nav-none .tad-slide__pause-float {
    opacity: 1; /* 減少動態時直接顯示，不做淡入 */
  }
}

/* ============================================
   響應式
   ============================================ */
@media (max-width: 600px) {
  .tad-slide__caption { font-size: 0.82rem; padding: 0.5rem 0.75rem; }
  .tad-slide--nav-bottom .tad-slide__controls-bar { gap: 0.3rem; padding: 0.4rem; }
  .tad-slide__btn { font-size: 0.8rem; padding: 0.25rem 0.5rem; }
  .tad-slide--nav-sides .tad-slide__arrow { width: 40px; height: 40px; font-size: 1.1rem; }
}

/* ── 螢幕閱讀器專用隱藏 ── */
.tad-sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   單張投影片模式：隱藏所有控制元件
   ============================================ */
.tad-slide--single .tad-slide__controls-bar,
.tad-slide--single .tad-slide__arrow,
.tad-slide--single .tad-slide__pause-float,
.tad-slide--single .tad-slide__progress {
  display: none !important;
}

/* 單張時第一個 item 直接顯示，不需要 transition */
.tad-slide--single .tad-slide__item {
  position: relative;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: none;
  transform: none;
}
.tad-slide__item a {
  display: block;        /* 讓 <a> 撐滿整張投影片 */
  line-height: 0;        /* 消除圖片底部空白縫隙 */
  outline-offset: -3px; /* 焦點框往內縮，不被容器裁切 */
}

.tad-slide__item a:focus-visible {
  outline: 3px solid #ffdd00;
}

.tad-slide__item a img {
  display: block;
  width: 100%;
  height: auto;
}