:root {
  color-scheme: dark;
  --bg-top: #071011;
  --bg-bottom: #0a1112;
  --panel: rgba(9, 21, 23, 0.86);
  --panel-border: rgba(160, 205, 192, 0.12);
  --text: #e4f6ef;
  --muted: #7fa79d;
  --accent: #90ffbf;
  --danger: #ff9670;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(56, 88, 92, 0.08), transparent 34%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

.app-shell {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
  height: 100dvh;
  min-height: 0;
  padding: 14px;
}

.hud-panel,
.arena-panel {
  border: 1px solid var(--panel-border);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.hud-panel {
  border-radius: 16px;
  padding: 12px;
}

.settings-button {
  display: none;
}

.hud-row,
.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.controls-row {
  margin-top: 10px;
}

.spawner-instruction {
  display: flex;
  flex: 1 1 100%;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 10px;
  color: #c8ded7;
  line-height: 1.35;
  text-align: center;
}

.instruction-spawners {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.instruction-spawner {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid currentColor;
  background:
    radial-gradient(circle, currentColor 0 18%, rgba(7, 30, 33, 0.78) 20% 54%, transparent 56%);
  opacity: 0.62;
  box-shadow: 0 0 14px rgba(255, 255, 255, 0.08);
}

.instruction-plant {
  color: rgba(112, 225, 138, 0.96);
}

.instruction-herbivore {
  color: rgba(240, 214, 142, 0.95);
}

.instruction-carnivore {
  color: rgba(235, 118, 98, 0.96);
}

.economy-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.economy-card {
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.035);
}

.economy-card strong {
  display: block;
  font-size: 0.88rem;
  color: #d8eee6;
}

button,
.toggle,
.slider-group {
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

button {
  padding: 9px 14px;
  cursor: pointer;
  font: inherit;
}

button:hover,
.toggle:hover,
.slider-group:hover {
  border-color: rgba(132, 243, 189, 0.3);
}

.toggle,
.slider-group {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
}

.toggle input {
  accent-color: var(--accent);
}

.slider-group input {
  width: 120px;
}

.slider-group-compact {
  min-width: 220px;
  justify-content: space-between;
}

.slider-group-compact span {
  min-width: 88px;
}

.arena-panel {
  position: relative;
  min-height: 0;
  border-radius: 18px;
  overflow: hidden;
}

.arena-panel:fullscreen {
  width: 100vw;
  height: 100vh;
  border-radius: 0;
}

#simCanvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}

.canvas-hint {
  position: absolute;
  right: 14px;
  bottom: 14px;
  padding: 7px 10px;
  font-size: 0.8rem;
  color: var(--muted);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.22);
  pointer-events: none;
}

@media (max-width: 720px) {
  .app-shell {
    display: block;
    padding: 0;
  }

  .hud-panel {
    position: fixed;
    z-index: 20;
    top: 10px;
    left: 10px;
    right: 10px;
    max-height: calc(100dvh - 20px);
    overflow-y: auto;
    border-radius: 14px;
    transform: translateY(calc(-100% - 18px));
    transition: transform 180ms ease;
  }

  .settings-open .hud-panel {
    transform: translateY(0);
  }

  .settings-button {
    position: fixed;
    z-index: 30;
    top: 12px;
    right: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 38px;
    padding: 8px 11px;
    border-radius: 999px;
    background: rgba(7, 22, 24, 0.82);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.32);
    backdrop-filter: blur(10px);
  }

  .settings-open .settings-button {
    top: 18px;
    right: 18px;
  }

  .hud-row,
  .controls-row {
    padding-right: 92px;
  }

  .spawner-instruction {
    flex-wrap: wrap;
    justify-content: flex-start;
    text-align: left;
  }

  #fullscreenButton {
    display: none;
  }

  .arena-panel {
    width: 100vw;
    height: 100dvh;
    border: 0;
    border-radius: 0;
  }

  .canvas-hint {
    left: 14px;
    right: 14px;
    border-radius: 12px;
  }
}