.popup-ad[hidden] { display: none; }
.popup-ad {
  position: fixed;
  left: 16px;
  bottom: 24px;
  z-index: 2000;
  display: block;
  padding: 0;
  background: transparent;
  pointer-events: none;
}
.popup-ad-card {
  position: relative;
  display: block;
  width: max-content;
  max-width: 70vw;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  pointer-events: auto;
}
.popup-ad-link {
  display: block;
  max-width: none;
  max-height: none;
}
.popup-ad-link img {
  display: block;
  width: 220px;
  max-width: 60vw;
  height: auto;
  max-height: none;
  object-fit: contain;
}
.popup-ad-close {
  position: absolute;
  left: 6px;
  top: 6px;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 50%;
  background: rgba(0, 0, 0, .78);
  color: #fff;
  font: 700 26px/1 Arial, sans-serif;
  cursor: pointer;
}
.popup-ad-close:hover,
.popup-ad-close:focus-visible {
  background: #ff4b5c;
  outline: none;
}
@media (max-width: 640px) {
  .popup-ad { left: 8px; bottom: 76px; padding: 0; }
  .popup-ad-card { width: auto; max-width: 70vw; padding: 0; border-radius: 0; }
  .popup-ad-link img { max-width: 58vw; }
}

/* Web 端左右各两张固定广告：始终显示，手机端不出现。 */
.desktop-side-ads { display: none; }
@media (min-width: 768px) {
  .desktop-side-ads { display: block; }
  .desktop-side-ad { position: fixed; z-index: 1500; display: block; width: min(300px, 16vw); }
  .desktop-side-ad img { display: block; width: 100%; height: auto; }
  .side-ad-left { left: 16px; }
  .side-ad-right { left: auto; right: 16px; }
  .side-ad-top { top: 6%; }
  .side-ad-bottom { bottom: 6%; }
  .side-ad-middle { top: 50%; width: min(240px, 16vw); transform: translateY(-50%); }
  .popup-ad { display: none !important; }
}

/* 点击播放后强制展示 15 秒的广告，没有关闭按钮。 */
.play-ad[hidden] { display: none; }
.play-ad {
  position: fixed;
  inset: 0;
  z-index: 3000;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, .88);
}
.play-ad-card { position: relative; max-width: min(90vw, 720px); max-height: 90vh; }
.play-ad-card img { display: block; max-width: 100%; max-height: 80vh; object-fit: contain; }
.play-ad-count {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 4px 10px;
  border-radius: 8px;
  background: #000;
  color: #fff;
  font: 700 14px/1.4 Arial, sans-serif;
}