/* ── 全域重置 ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #000;
  cursor: none;
}

/* ── 媒體層（img / video） ── */
.media-layer {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  object-fit: cover;       /* 填滿螢幕，裁切多餘部分 */
  object-position: center;
  background: #000;
  z-index: 1;
}

.media-layer.hidden {
  opacity: 0;
  pointer-events: none;
}

/* ── YouTube 容器 ── */
#yt-wrapper {
  position: fixed;
  inset: 0;
  background: #000;
  z-index: 1;
  display: none;
  overflow: hidden;
}

/* 使 YouTube iframe 填滿螢幕（16:9 cover 效果）*/
#yt-wrapper > iframe {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100vw;
  height: 56.25vw;       /* 100vw × 9/16 */
  min-height: 100vh;
  min-width: 177.78vh;   /* 100vh × 16/9 */
  transform: translate(-50%, -50%);
  border: none;
}

/* ── 淡入淡出遮罩 ──────────────────────────────────
   初始 opacity:1（黑色覆蓋），第一個媒體就緒後由 JS
   設為 0，切換廣告時再設回 1，形成平滑的黑幕淡變效果。  */
#fade-overlay {
  position: fixed;
  inset: 0;
  background: #000;
  z-index: 2;
  opacity: 1;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

/* ── 時鐘 ── */
#clock {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 20;   /* 高於媒體(1)、遮罩(2)、載入提示(10) */
  text-align: right;
  color: #fff;
  font-family: -apple-system, 'Segoe UI', system-ui, sans-serif;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 0.6rem 1.1rem 0.65rem;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.6);
  user-select: none;
}

#clock-time {
  display: block;
  font-size: 2.1rem;
  font-weight: 200;
  letter-spacing: 0.06em;
  line-height: 1;
}

#clock-date {
  display: block;
  font-size: 0.7rem;
  opacity: 0.6;
  margin-top: 0.4rem;
  letter-spacing: 0.12em;
}

/* ── 跑馬燈 ── */
#ticker {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100vw;
  height: 44px;
  background: rgba(0, 0, 0, 0.62);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  z-index: 20;   /* 高於媒體(1)、遮罩(2)、載入提示(10) */
  overflow: hidden;
  display: none;       /* 預設隱藏；由 JS 加上 ticker-active class 顯示 */
  align-items: center;
}

#ticker.ticker-active {
  display: flex;
}

.ticker-track {
  display: inline-flex;
  white-space: nowrap;
  animation: ticker-scroll 30s linear infinite;
  will-change: transform;
}

.ticker-track span {
  display: inline-block;
  color: #fff;
  font-size: 1rem;
  font-family: -apple-system, 'Segoe UI', system-ui, sans-serif;
  letter-spacing: 0.05em;
  padding: 0;
}

@keyframes ticker-scroll {
  from { transform: translateX(100vw); }
  to   { transform: translateX(-100%); }
}

/* ── 載入提示 ── */
#loading {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
  font-family: -apple-system, 'Segoe UI', system-ui, sans-serif;
  letter-spacing: 0.1em;
  z-index: 10;
}

#loading.hidden {
  display: none;
}