*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1410;
  --panel: #1a2418;
  --panel-border: #3d4f35;
  --accent: #8fbc6a;
  --accent-warn: #c9a227;
  --accent-danger: #8b3a2a;
  --text: #c8d4bc;
  --muted: #6b7a62;
  --camo-1: #3a4f2f;
  --camo-2: #2a3528;
}

html,
body {
  height: 100%;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(58, 79, 47, 0.25) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(42, 53, 40, 0.3) 0%, transparent 45%);
  color: var(--text);
  font-family: "Share Tech Mono", "Courier New", monospace;
  font-size: 13px;
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px;
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

.title-bar {
  text-align: center;
  margin-bottom: 14px;
  border-bottom: 2px solid var(--panel-border);
  padding-bottom: 12px;
}

.title-bar h1 {
  font-size: 1.6rem;
  color: var(--accent);
  letter-spacing: 4px;
  text-transform: uppercase;
  text-shadow: 0 0 20px rgba(143, 188, 106, 0.3);
}

.subtitle {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.85rem;
}

.game-area {
  position: relative;
  flex: 1;
  border: 3px solid var(--panel-border);
  box-shadow:
    inset 0 0 40px rgba(0, 0, 0, 0.5),
    0 8px 24px rgba(0, 0, 0, 0.4);
  background: var(--camo-2);
  min-height: 520px;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 520px;
  cursor: crosshair;
}

.hud {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  padding: 10px 14px;
  background: linear-gradient(180deg, rgba(15, 20, 15, 0.9), transparent);
  font-size: 0.8rem;
  pointer-events: none;
}

.hud strong {
  color: var(--accent-warn);
}

.overlay {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 12, 8, 0.88);
  padding: 20px;
}

.overlay.hidden {
  display: none;
}

.panel {
  background: var(--panel);
  border: 2px solid var(--panel-border);
  padding: 24px 28px;
  max-width: 420px;
  box-shadow: 0 0 0 1px rgba(143, 188, 106, 0.1);
}

.panel h2 {
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.controls {
  list-style: none;
  line-height: 1.9;
  color: var(--text);
  font-size: 0.82rem;
}

.controls kbd {
  display: inline-block;
  min-width: 1.4em;
  padding: 2px 6px;
  margin-right: 4px;
  background: var(--camo-1);
  border: 1px solid var(--panel-border);
  font-size: 0.75rem;
}

.tech-hint {
  margin-top: 14px;
  font-size: 0.72rem;
  color: var(--muted);
  line-height: 1.6;
}

.tech-hint code {
  color: var(--accent);
}

.level-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 18px;
}

.btn {
  font-family: inherit;
  font-size: 0.85rem;
  padding: 10px 16px;
  cursor: pointer;
  background: var(--camo-1);
  color: var(--text);
  border: 1px solid var(--panel-border);
  letter-spacing: 1px;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: #4a5f3f;
  border-color: var(--accent);
}

.btn.primary {
  background: #3d5230;
  border-color: var(--accent);
  color: var(--accent);
}

.end-panel {
  text-align: center;
}

.end-panel.fail h2 {
  color: var(--accent-danger);
}

.end-panel.win h2 {
  color: var(--accent);
}

.end-panel .btn {
  margin: 8px 6px 0;
}

.tech-note {
  margin-top: 12px;
  text-align: center;
  font-size: 0.7rem;
  color: var(--muted);
}

.tech-note code {
  color: var(--accent);
}

.hidden {
  display: none !important;
}