* { box-sizing: border-box; }
html, body {
  margin: 0; height: 100%; overflow: hidden;
  background: radial-gradient(ellipse at 50% 35%, #2b3440 0%, #12161c 60%, #07090c 100%);
  font-family: -apple-system, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  color: #e7edf3;
}
canvas { display: block; }

.glass {
  position: absolute;
  background: rgba(16, 21, 28, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 14px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

#panel { left: 18px; top: 18px; width: 290px; padding: 16px 18px; }
.title { font-size: 22px; font-weight: 800; letter-spacing: 2px; }
.subtitle { font-size: 12px; opacity: .65; margin-bottom: 14px; }

.slider-label { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 6px; }
#explodeVal { font-variant-numeric: tabular-nums; color: #7fd0ff; }

input[type=range] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 6px; border-radius: 3px;
  background: linear-gradient(90deg, #3aa8ff var(--p, 0%), #3a4552 var(--p, 0%));
  outline: none; margin: 4px 0 16px;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%;
  background: #fff; border: 3px solid #3aa8ff; cursor: grab; box-shadow: 0 2px 8px rgba(0,0,0,.4);
}

button.start {
  width: 100%; padding: 11px 0; border: 0; border-radius: 10px; cursor: pointer;
  font-weight: 800; letter-spacing: 2px; font-size: 14px; color: #fff;
  background: linear-gradient(180deg, #2fbf71, #1d8f52);
  box-shadow: 0 4px 16px rgba(47, 191, 113, .35); transition: transform .1s, filter .2s;
}
button.start:hover { filter: brightness(1.1); }
button.start.pressed { transform: scale(.96); }
button.start.stop { background: linear-gradient(180deg, #e2554a, #a8322a); box-shadow: 0 4px 16px rgba(226, 85, 74, .35); }

.toggles { display: flex; flex-direction: column; gap: 6px; margin: 14px 0 10px; font-size: 13px; }
.toggles input { accent-color: #3aa8ff; }

.specs { font-size: 11px; line-height: 1.55; opacity: .8; border-top: 1px solid rgba(255,255,255,.08); padding-top: 10px; }
.specs b { color: #9fd8ff; font-weight: 600; margin-right: 4px; }

#hud { right: 18px; top: 18px; width: 250px; padding: 14px 16px; font-size: 12px; }
.state { font-weight: 800; letter-spacing: 1.5px; font-size: 13px; margin-bottom: 10px; color: #7fd0ff; }
.gauge { display: grid; grid-template-columns: 34px 1fr 70px; align-items: center; gap: 8px; margin: 7px 0; }
.gauge span { opacity: .8; }
.gauge em { font-style: normal; text-align: right; font-variant-numeric: tabular-nums; }
.bar { height: 7px; background: #2a333d; border-radius: 4px; overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #2fbf71, #7fe0a7); border-radius: 4px; }
.bar.hot i { background: linear-gradient(90deg, #f2c14e, #ff5a36); }
.power { margin-top: 10px; font-size: 24px; font-weight: 800; text-align: right; font-variant-numeric: tabular-nums; }
.power span { color: #fff; }

#labels { position: absolute; inset: 0; pointer-events: none; }
.lbl {
  position: absolute; transform: translate(-50%, -100%); white-space: nowrap;
  font-size: 11.5px; font-weight: 600; padding: 3px 8px; border-radius: 6px;
  background: rgba(10, 14, 20, .78); border: 1px solid rgba(127, 208, 255, .45); color: #e8f6ff;
}
.lbl::after {
  content: ""; position: absolute; left: 50%; top: 100%; width: 1px; height: 14px; background: rgba(127, 208, 255, .6);
}

#cursor {
  position: absolute; width: 22px; height: 22px; pointer-events: none; display: none; z-index: 10;
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M3 2l7 19 2.6-7.4L20 11z' fill='white' stroke='black' stroke-width='1.5' stroke-linejoin='round'/></svg>") no-repeat;
  filter: drop-shadow(0 2px 3px rgba(0,0,0,.6));
}
#cursor.down { transform: scale(.85); }

/* ── Mobile / portrait: HUD strip on top, compact control panel at the bottom ── */
@media (max-width: 700px) {
  .glass { border-radius: 12px; }
  #hud {
    top: calc(8px + env(safe-area-inset-top)); left: 8px; right: 8px; width: auto; padding: 8px 10px;
    display: grid; grid-template-columns: repeat(3, 1fr); column-gap: 10px; row-gap: 2px; font-size: 10.5px;
  }
  .state { grid-column: 1 / 3; margin: 0 0 4px; font-size: 11px; }
  .power { grid-column: 3; grid-row: 1; margin: 0; font-size: 14px; }
  .gauge { grid-template-columns: 26px 1fr; grid-template-rows: auto auto; gap: 1px 6px; margin: 2px 0; }
  .gauge span { grid-row: 1 / 3; align-self: center; }
  .gauge em { grid-column: 2; grid-row: 1; text-align: left; font-size: 10px; }
  .gauge .bar { grid-column: 2; grid-row: 2; height: 4px; }

  #panel {
    left: 8px; right: 8px; top: auto; bottom: calc(8px + env(safe-area-inset-bottom));
    width: auto; padding: 10px 12px;
  }
  .title { font-size: 15px; display: inline-block; margin-right: 8px; }
  .subtitle { display: inline; font-size: 11px; }
  .slider-label { margin-top: 8px; font-size: 12px; }
  input[type=range] { margin: 6px 0 10px; height: 8px; }
  input[type=range]::-webkit-slider-thumb { width: 26px; height: 26px; }
  button.start { padding: 10px 0; font-size: 13px; }
  .toggles { flex-direction: row; flex-wrap: wrap; gap: 4px 12px; margin: 10px 0 0; font-size: 12px; }
  .specs { display: none; }
  .lbl { font-size: 9.5px; padding: 2px 5px; }
}
/* Landscape phones: slimmer side panels */
@media (max-height: 500px) and (min-width: 701px) {
  #panel { width: 220px; padding: 10px 12px; top: 8px; left: 8px; }
  #hud { width: 190px; padding: 8px 10px; top: 8px; right: 8px; font-size: 10.5px; }
  .specs, .subtitle { display: none; }
  .title { font-size: 16px; }
  .gauge { margin: 3px 0; grid-template-columns: 28px 1fr 58px; }
  .power { font-size: 16px; margin-top: 4px; }
  .toggles { margin: 8px 0 0; gap: 3px; font-size: 12px; }
  .lbl { font-size: 9.5px; }
}