.upgrade-overlay * { box-sizing: border-box; }
.upgrade-overlay {
  position: fixed;
  z-index: 10000;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  display: none;
  align-items: center;
  justify-content: center;
}
.upgrade-overlay.is-open {
  display: flex;
}
.upgrade-overlay .outer {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.upgrade-overlay .panel {
  width: min(450px, 85vw);
}
.upgrade-overlay .inner {
  background: url('./ap_bg_upgrade2.jpg') no-repeat center / cover;
  padding: 0 18px 18px;
  color: #fff;
  text-align: center;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 540px;
}
.upgrade-overlay .inner .content {
  margin-top: auto;
  margin-bottom: 40px;
  font-size: 1.08em;
}
.upgrade-overlay h2 {
  margin: 6px 0 14px;
  text-shadow: 2px 2px 2px #000;
}
.upgrade-overlay .msg {
  background: rgba(0,0,0,.28);
  padding: 24px 10px;
  width: 80%;
  margin: 0 auto;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 4px;
}
.upgrade-overlay .msg > div:not(.time),
.upgrade-overlay .tip {
  font-size: 0.81em;
}
.upgrade-overlay .time {
  color: #ffd54f;
  font-weight: bold;
  font-size: 1.3em;
  line-height: 1.8;
}
.upgrade-overlay .tip {
  margin-top: 9px;
  line-height: 1.5;
}
.upgrade-overlay .tip .time {
  font-size: 1.1em;
}
.upgrade-overlay .btn {
  min-width: 200px;
  min-height: 50px;
  border: none;
  border-radius: 10px;
  color: #523719;
  font-size: clamp(16px, 3vw, 20px);
  font-weight: 700;
  background:
    linear-gradient(20deg, rgba(237,109,60,0.2), transparent),
    linear-gradient(to top, #fed366, #f49555, #fed366);
  cursor: pointer;
  box-shadow: 0 2px 0 #c05627;
  transition: 0.2s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 52px;
}
@media (orientation: portrait) and (max-width: 480px) {
  .upgrade-overlay .inner { min-height: 0; aspect-ratio: 960 / 1180; }
  .upgrade-overlay .inner .content { font-size: 0.9em; margin-bottom: 10px; }
  .upgrade-overlay .btn { min-width: 140px; min-height: 36px; font-size: 14px; margin-top: 20px; }
}