/* ============================================
   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）
   ============================================ */
/* 控制列：上一張 → 下一張 → 分頁點（由左至右） */
.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;
}

/* 暫停按鈕（獨立置於輪播頂部，橫跨整個寬度） */
.tad-slide--nav-bottom .tad-slide__pause {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 44px;
  padding: 0.4rem 1rem;
  border-radius: 0;
  background: #c0392b;
  font-weight: 600;
  font-size: 0.875rem;
  color: #fff;
  cursor: pointer;
  border: none;
  border-bottom: 2px solid transparent;
  transition: background 0.2s, border-color 0.2s;
  position: relative;
  z-index: 15;
}
.tad-slide--nav-bottom .tad-slide__pause:hover { background: #e74c3c; }
.tad-slide--nav-bottom .tad-slide__pause:focus-visible {
  outline: 3px solid #ffdd00;
  outline-offset: 2px;
  border-color: #ffdd00;
  background: #a93226;
}
.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; }
.tad-slide--nav-bottom .tad-slide__pause[aria-pressed="false"]:focus-visible { background: #1e8449; }

/* 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：極簡純箭頭，無背景，加大尺寸更醒目 */
.tad-slide--nav-sides .tad-slide__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  background: none;
  border: none;
  border-radius: 0;
  width: 72px;
  height: 72px;
  min-width: 72px;
  min-height: 72px;
  padding: 0;
  cursor: pointer;
  /* 滑入顯示 */
  opacity: 0;
  transition: opacity 0.3s, transform 0.25s;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.75));
}
/* SVG 箭頭圖示 */
.tad-slide--nav-sides .tad-slide__arrow--prev {
  left: 0.5rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='15 18 9 12 15 6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 56px 56px;
}
.tad-slide--nav-sides .tad-slide__arrow--next {
  right: 0.5rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='9 18 15 12 9 6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 56px 56px;
}
/* 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;
}
/* hover 時箭頭微移動 + 黃色 + 加強陰影 */
.tad-slide--nav-sides .tad-slide__arrow--prev:hover {
  transform: translateY(-50%) translateX(-4px);
  filter: drop-shadow(0 2px 10px rgba(0, 0, 0, 0.9));
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffdd00' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='15 18 9 12 15 6'/%3E%3C/svg%3E");
}
.tad-slide--nav-sides .tad-slide__arrow--next:hover {
  transform: translateY(-50%) translateX(4px);
  filter: drop-shadow(0 2px 10px rgba(0, 0, 0, 0.9));
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffdd00' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='9 18 15 12 9 6'/%3E%3C/svg%3E");
}
.tad-slide--nav-sides .tad-slide__arrow:focus-visible {
  opacity: 1;
  outline: 3px solid #ffdd00;
  outline-offset: 4px;
  border-radius: 4px;
}

/* 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 */
  }
  /* 減少動態：箭頭 hover 不位移 */
  .tad-slide--nav-sides .tad-slide__arrow--prev:hover,
  .tad-slide--nav-sides .tad-slide__arrow--next:hover {
    transform: translateY(-50%) !important;
  }
}

/* ============================================
   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--nav-bottom .tad-slide__pause { font-size: 0.8rem; min-height: 40px; }
  .tad-slide__btn { font-size: 0.8rem; padding: 0.25rem 0.5rem; }
  .tad-slide--nav-sides .tad-slide__arrow { width: 52px; height: 52px; background-size: 40px 40px; }
}

/* ── 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__pause,
.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 */
  position: relative;    /* 為偽元素定位提供參考 */
}

/* 改善輪播圖片連結的焦點樣式 */
.tad-slide__item a:focus-visible {
  outline: none;         /* 移除預設外框 */
}

/* 使用偽元素創建更明顯的焦點指示器 */
.tad-slide__item a:focus-visible::after {
  content: "";
  position: absolute;
  inset: 0;              /* 覆蓋整個連結區域 */
  z-index: 5;            /* 確保在圖片上方 */
  box-shadow: inset 0 0 0 4px #ffdd00, inset 0 0 0 6px rgba(0, 0, 0, 0.5); /* 雙層外框效果 */
  border-radius: 2px;    /* 輕微圓角 */
  pointer-events: none;  /* 允許點擊穿透到連結 */
}

/* 為焦點狀態添加額外視覺指示 */
.tad-slide__item a:focus-visible::before {
  content: "↵";          /* 顯示一個進入符號 */
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: rgba(0, 0, 0, 0.7);
  color: #ffdd00;
  font-size: 2rem;
  font-weight: bold;
  width: 80px;
  height: 80px;
  line-height: 80px;
  text-align: center;
  border-radius: 50%;
  z-index: 6;
  pointer-events: none;  /* 允許點擊穿透到連結 */
}

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