* { box-sizing: border-box; }

html,
body {
  margin: 0;
  min-height: 100%;
  color: #f7fbff;
  font-family: "Trebuchet MS", "Segoe UI", Tahoma, sans-serif;
  background:
    radial-gradient(48% 38% at 12% 10%, #223f54 0%, transparent 72%),
    radial-gradient(42% 34% at 88% 86%, #4f3429 0%, transparent 72%),
    linear-gradient(180deg, #0b1218 0%, #151923 56%, #0b1013 100%);
  overflow: hidden;
}

button {
  min-height: 42px;
  border: 1px solid rgba(210, 228, 255, 0.34);
  border-radius: 8px;
  background: rgba(42, 55, 70, 0.96);
  color: #f7fbff;
  font: 800 14px/1.1 "Trebuchet MS", "Segoe UI", Tahoma, sans-serif;
  cursor: pointer;
  touch-action: manipulation;
}

button:hover {
  background: rgba(58, 76, 94, 0.98);
}

button:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 2px;
}

button.primary {
  border-color: rgba(142, 242, 194, 0.78);
  background: #4fd09b;
  color: #061a14;
}

.back {
  position: fixed;
  top: calc(env(safe-area-inset-top, 0px) + 12px);
  left: calc(env(safe-area-inset-left, 0px) + 12px);
  z-index: 50;
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  font-weight: 800;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  padding: 8px 12px;
  background: rgba(0, 0, 0, 0.54);
}

.app {
  min-height: 100dvh;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto auto auto;
  gap: 10px;
  padding: max(calc(env(safe-area-inset-top, 0px) + 54px), 62px) 10px calc(env(safe-area-inset-bottom, 0px) + 10px);
}

.arena-panel {
  width: min(100%, 1120px);
  max-height: min(67dvh, 720px);
  aspect-ratio: 3 / 2;
  justify-self: center;
  position: relative;
}

.arena-panel:focus-visible {
  outline: 3px solid rgba(142, 242, 194, 0.95);
  outline-offset: 4px;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 8px;
  border: 2px solid rgba(158, 206, 255, 0.48);
  box-shadow: 0 18px 52px rgba(0, 0, 0, 0.58);
  background: #111820;
}

.menu {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 14px;
  background: rgba(8, 13, 18, 0.58);
}

.menu.show {
  display: flex;
}

.menu-panel {
  width: min(680px, 100%);
  border-radius: 8px;
  border: 1px solid rgba(190, 224, 255, 0.35);
  background: rgba(14, 22, 30, 0.96);
  padding: 16px;
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.42);
}

.menu-panel h1 {
  margin: 0 0 8px;
  font-size: clamp(28px, 5vw, 44px);
}

.menu-panel p {
  margin: 0;
  color: #d5e5f4;
  font-size: clamp(14px, 2vw, 16px);
  line-height: 1.45;
}

.menu-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.menu-actions button {
  min-width: 130px;
  padding: 10px 14px;
}

.hud,
.controls,
.status-strip {
  width: min(100%, 1120px);
  justify-self: center;
}

.hud {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 8px;
}

.metric {
  min-height: 48px;
  border-radius: 8px;
  border: 1px solid rgba(199, 224, 255, 0.24);
  background: rgba(14, 22, 30, 0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  text-align: center;
  padding: 4px;
}

.metric span {
  color: #b7c9d9;
  font-size: 11px;
  line-height: 1;
  text-transform: uppercase;
}

.metric b {
  max-width: 100%;
  overflow-wrap: anywhere;
  color: #f7fbff;
  font-size: clamp(12px, 1.55vw, 17px);
  line-height: 1.05;
  white-space: normal;
}

.metric.good b { color: #92f0c2; }
.metric.warn b { color: #ffd27f; }

.status-strip {
  min-height: 42px;
  border-radius: 8px;
  border: 1px solid rgba(199, 224, 255, 0.22);
  background: rgba(14, 22, 30, 0.88);
  display: flex;
  align-items: center;
  padding: 8px 12px;
}

.status-strip p {
  margin: 0;
  color: #dbe9f8;
  font-size: 14px;
  line-height: 1.35;
}

.controls {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 860px) {
  body { overflow-y: auto; }
  .app {
    min-height: 100dvh;
    grid-template-rows: auto auto auto auto;
  }
  .arena-panel {
    max-height: 54dvh;
  }
  .hud {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .controls {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .hud {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .controls button:last-child {
    grid-column: 1 / -1;
  }
}