:root {
  --bg-0: #fff5df;
  --bg-1: #dbf5f0;
  --bg-2: #ffd7ba;
  --panel: rgba(255, 255, 255, 0.74);
  --panel-strong: rgba(255, 255, 255, 0.9);
  --ink: #253452;
  --muted: #5a6f91;
  --stroke: rgba(66, 92, 132, 0.24);
  --shadow: 0 22px 48px rgba(41, 62, 97, 0.2);
  --brand-a: #ffb257;
  --brand-b: #ffc766;
  --brand-c: #6fcfbc;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 6%, rgba(255, 188, 119, 0.48) 0, rgba(255, 188, 119, 0) 34%),
    radial-gradient(circle at 88% 10%, rgba(112, 210, 191, 0.44) 0, rgba(112, 210, 191, 0) 36%),
    linear-gradient(145deg, var(--bg-0), var(--bg-1));
  font-family:
    "Avenir Next",
    "Trebuchet MS",
    "Verdana",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(46, 66, 96, 0.08) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.22;
}

.app-shell {
  width: min(1120px, calc(100vw - 30px));
  margin: 18px auto 24px;
  display: grid;
  grid-template-columns: minmax(290px, 370px) minmax(360px, 1fr);
  gap: 18px;
  position: relative;
  z-index: 1;
}

.panel {
  border-radius: 22px;
  border: 1px solid var(--stroke);
  background: linear-gradient(160deg, var(--panel-strong), var(--panel));
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.hud-panel {
  padding: 18px;
}

.hud-panel h1 {
  margin: 0;
  font-size: 1.75rem;
  line-height: 1.06;
  letter-spacing: 0.01em;
}

.sub {
  margin: 7px 0 14px;
  color: var(--muted);
  font-weight: 700;
}

.hud-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.hud-item {
  border-radius: 14px;
  border: 1px solid rgba(66, 92, 132, 0.14);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(239, 247, 255, 0.8));
  padding: 9px 11px;
  display: grid;
  gap: 3px;
}

.hud-item .k {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(74, 96, 132, 0.78);
  font-weight: 800;
}

.hud-item strong {
  font-size: 1.03rem;
  line-height: 1.2;
  color: #1f314f;
}

.hud-item.wide {
  grid-column: 1 / -1;
}

.status-item strong {
  min-height: 1.35em;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 13px;
}

button,
.home-link {
  appearance: none;
  border: 1px solid rgba(73, 101, 145, 0.22);
  border-radius: 12px;
  padding: 9px 11px;
  font-weight: 800;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  color: #1f324e;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(236, 246, 255, 0.9));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.76),
    0 8px 14px rgba(94, 118, 156, 0.15);
  transition:
    transform 120ms ease,
    box-shadow 180ms ease,
    filter 180ms ease;
}

#pauseBtn {
  background: linear-gradient(180deg, #fff4d9, #ffe6bb);
}

#restartBtn {
  background: linear-gradient(180deg, #fff1dc, #ffd9a6);
}

#muteBtn {
  background: linear-gradient(180deg, #eafff6, #c9f0e5);
}

.home-link {
  background: linear-gradient(180deg, #eef5ff, #d9e9ff);
}

button:hover,
.home-link:hover {
  filter: brightness(1.02);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.76),
    0 12px 20px rgba(86, 107, 140, 0.24);
}

button:active,
.home-link:active {
  transform: translateY(1px);
}

.tips {
  margin: 13px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.44;
}

.play-panel {
  padding: 12px;
  display: grid;
  place-items: center;
}

#gameCanvas {
  width: min(100%, 560px);
  max-height: calc(100vh - 44px);
  height: auto;
  border-radius: 18px;
  border: 1px solid rgba(87, 114, 156, 0.34);
  background: linear-gradient(160deg, #f8fcff, #d8ecf6);
  display: block;
  touch-action: none;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.55),
    0 28px 52px rgba(63, 88, 128, 0.24);
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 22, 35, 0.44);
  display: grid;
  place-items: center;
  padding: 18px;
  z-index: 20;
}

.overlay.hidden {
  display: none;
}

.overlay-card {
  width: min(430px, 100%);
  padding: 20px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: linear-gradient(160deg, rgba(36, 52, 84, 0.95), rgba(26, 40, 69, 0.94));
  color: #e6f1ff;
  box-shadow: 0 24px 60px rgba(4, 12, 24, 0.58);
}

.overlay-card h2 {
  margin: 0 0 12px;
}

.overlay-card p {
  margin: 7px 0;
  font-weight: 700;
}

.overlay-actions {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

@media (max-width: 940px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .hud-panel {
    order: 2;
  }

  .play-panel {
    order: 1;
  }

  #gameCanvas {
    width: min(100%, 500px);
    max-height: none;
  }
}