:root {
  --bg-top: #07111f;
  --bg-bottom: #17314b;
  --panel: rgba(7, 16, 28, 0.88);
  --panel-border: rgba(155, 208, 255, 0.18);
  --accent: #f7c96a;
  --mint: #92ffd3;
  --ice: #87d2ff;
  --danger: #ff7a7a;
  --text: #edf5ff;
  --muted: #9fb8cd;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(87, 204, 255, 0.22), transparent 36%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

body {
  padding: 20px;
}

.shell {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 18px;
  max-width: 1600px;
  margin: 0 auto;
}

.hud-panel,
.game-panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(18px);
}

.hud-panel {
  padding: 24px;
}

.eyebrow,
h1,
h2,
.card strong {
  font-family: "Palatino Linotype", "Book Antiqua", Georgia, serif;
}

.eyebrow {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 10px 0 12px;
  font-size: 2.3rem;
  line-height: 1;
}

h2 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.summary {
  color: var(--muted);
  line-height: 1.6;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.card {
  padding: 14px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(20, 40, 59, 0.8), rgba(10, 20, 30, 0.95));
  border: 1px solid rgba(148, 195, 232, 0.12);
}

.card span {
  display: block;
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.card strong {
  display: block;
  margin-top: 6px;
  font-size: 1.6rem;
}

.controls,
.legend,
.tip-box {
  margin-top: 22px;
}

.controls ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
  color: var(--muted);
}

kbd {
  display: inline-block;
  min-width: 26px;
  padding: 4px 8px;
  margin-right: 6px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  font-family: inherit;
  font-size: 0.78rem;
  text-align: center;
}

.legend {
  display: grid;
  gap: 10px;
}

.legend-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 13px 14px;
  border-radius: 14px;
  border: 1px solid rgba(148, 195, 232, 0.14);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.legend-button:hover,
.legend-button.active {
  transform: translateY(-1px);
  border-color: rgba(247, 201, 106, 0.55);
  background: rgba(247, 201, 106, 0.11);
}

.legend-button small {
  color: var(--muted);
}

.tip-box {
  padding: 16px;
  border-radius: 16px;
  color: var(--mint);
  background: rgba(125, 252, 208, 0.08);
  border: 1px solid rgba(125, 252, 208, 0.16);
  min-height: 74px;
  line-height: 1.5;
}

.game-panel {
  display: flex;
  flex-direction: column;
  padding: 16px;
}

canvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 18px;
  background:
    radial-gradient(circle at 15% 12%, rgba(180, 241, 255, 0.16), transparent 18%),
    linear-gradient(180deg, #0a1a29 0%, #19364f 42%, #183046 65%, #10141b 100%);
}

.status-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 1120px) {
  .shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  body {
    padding: 12px;
  }

  .hud-panel,
  .game-panel {
    border-radius: 18px;
  }

  h1 {
    font-size: 1.9rem;
  }
}