* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  color: #151515;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(246, 248, 250, 0.9)),
    repeating-linear-gradient(90deg, #f5f7fa 0, #f5f7fa 2px, #eef1f4 2px, #eef1f4 4px);
}

.landing-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 18px;
}

.ad-shell {
  width: min(100%, 980px);
}

.ad-frame {
  width: 100%;
  min-height: min(72vh, 720px);
  overflow: hidden;
  text-align: center;
}

.ad-frame iframe,
.ad-frame ins,
.ad-frame img {
  max-width: 100%;
}

.custom-ad {
  display: block;
  width: 100%;
}

.custom-ad img {
  display: block;
  width: 100%;
  height: auto;
  border: 0;
}

.ad-empty,
.demo-ad,
.adblock-notice {
  width: min(100%, 720px);
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  border: 1px dashed #9aa4b2;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  color: #4b5563;
  font-size: 16px;
  text-align: center;
}

.adblock-notice {
  flex-direction: column;
  gap: 8px;
  border-style: solid;
  border-color: #f3b5ae;
  background: #fff5f4;
  color: #b42318;
}

.adblock-notice strong {
  font-size: 18px;
}

.adblock-notice span {
  color: #7a271a;
  line-height: 1.6;
}

.adblock-notice[hidden] {
  display: none;
}

@media (max-width: 640px) {
  .landing-page {
    padding: 12px;
  }

  .ad-frame {
    min-height: 76vh;
  }
}