:root {
  --bg-a: #081320;
  --bg-b: #112138;
  --panel: rgba(9, 18, 30, 0.68);
  --panel-border: rgba(132, 220, 255, 0.28);
  --text: #f4fbff;
  --muted: #b8d3e4;
  --accent: #7ee0ff;
  --active: #ffe08a;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, #1d3557 0%, var(--bg-a) 42%, #04080f 100%);
}

canvas {
  display: block;
}

#planetDock {
  position: fixed;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  background: var(--panel);
  backdrop-filter: blur(8px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
  z-index: 10;
  max-width: min(720px, calc(100% - 16px));
}


#planetDock button {
  appearance: none;
  border: 1px solid rgba(126, 224, 255, 0.24);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(17, 31, 49, 0.92), rgba(8, 15, 25, 0.92));
  color: var(--muted);
  padding: 8px 12px;
  font-size: 0.88rem;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, color 140ms ease, background 140ms ease;
}

#planetDock button:hover {
  transform: translateY(-1px);
  border-color: rgba(126, 224, 255, 0.55);
  color: var(--text);
}

#planetDock button.active {
  color: #081320;
  background: linear-gradient(180deg, #ffe8a8, #f0bc51);
  border-color: rgba(255, 232, 168, 0.95);
}

@media (max-width: 820px) {
  #planetDock {
    width: calc(100% - 16px);
  }

  #planetDock button {
    flex: 1 1 calc(25% - 8px);
    min-width: 0;
  }
}