* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  padding: max(20px, env(safe-area-inset-top)) 18px
    max(20px, env(safe-area-inset-bottom));
  background: #121212;
  color: #eee;
  font-family:
    Segoe UI,
    system-ui,
    sans-serif;
}
main {
  width: min(100%, 410px);
  margin: auto;
}
h1 {
  margin: 8px 0 0;
  color: #00ff70;
}
.sub {
  margin: 4px 0 18px;
  color: #888;
  font-size: 12px;
}
.card {
  margin: 12px 0;
  padding: 15px;
  background: #1e1e1e;
  border: 1px solid #2c2c2c;
  border-radius: 14px;
}
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
button {
  width: 100%;
  min-height: 62px;
  padding: 11px;
  border: 0;
  border-radius: 10px;
  color: #fff;
  font-weight: 800;
  font-size: 14px;
  cursor: pointer;
}
button:disabled {
  opacity: 0.5;
}
.on {
  background: #218838;
}
.off {
  background: #c82333;
}
.heater {
  background: #e57f00;
}
.duration {
  background: #2064a3;
}
#durationPanel {
  display: none;
  margin-top: 12px;
}
#status {
  min-height: 24px;
  margin: 12px 0;
  color: #ffcc00;
  font-weight: 700;
  font-size: 14px;
}
.last {
  color: #bbb;
  font-size: 12px;
  line-height: 1.5;
}