:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.4);
  --radius-md: 12px;
}

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

html, body {
  width: 600px;
  height: 600px;
  overflow: hidden;
  background: #000;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

#app { width: 100%; height: 100%; position: relative; }

.screen {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  flex-direction: column;
}

.screen.hidden { display: none; }
.hidden { display: none !important; }

.focusable {
  transition: all 0.15s ease;
  border: 2px solid transparent;
  cursor: pointer;
  outline: none;
}

.focusable:focus {
  border-color: var(--focus-ring);
  box-shadow: 0 0 20px var(--focus-glow);
}

/* HOME */
.home-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  gap: 24px;
}

.title {
  font-size: 64px;
  font-weight: 800;
  letter-spacing: 8px;
  color: var(--text-primary);
  text-shadow: 0 0 30px var(--focus-glow);
}

.tagline {
  font-size: 18px;
  color: var(--text-secondary);
  letter-spacing: 2px;
}

.hi-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  background: var(--bg-primary);
  padding: 16px 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-tertiary);
}

.hi-label {
  font-size: 14px;
  color: var(--text-muted);
  letter-spacing: 3px;
}

.hi-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent-secondary);
}

.menu {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 360px;
  margin-top: 16px;
}

.menu-btn {
  height: 88px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 3px;
  border-radius: var(--radius-md);
}

.menu-btn.primary {
  background: var(--bg-tertiary);
  color: var(--accent);
}

/* HOW TO */
.panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 36px;
  gap: 24px;
}

.panel-title {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: 4px;
  color: var(--text-primary);
}

.panel-title.danger { color: var(--danger); }

.ctl-list {
  list-style: none;
  width: 440px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ctl-list li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-tertiary);
}

.key {
  min-width: 80px;
  padding: 6px 12px;
  background: var(--bg-tertiary);
  color: var(--accent);
  border-radius: 6px;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 1px;
}

.desc {
  color: var(--text-secondary);
  font-size: 18px;
}

.hint {
  color: var(--text-muted);
  font-size: 14px;
  letter-spacing: 1px;
  font-style: italic;
}

/* GAME */
#canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 600px;
  height: 600px;
  background: transparent;
  display: block;
}

.hud {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: 14px 24px;
  z-index: 2;
  pointer-events: none;
}

.hud-cell {
  background: var(--bg-primary);
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid var(--bg-tertiary);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 80px;
}

.hud-label {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 2px;
  font-weight: 700;
}

.hud-value {
  font-size: 22px;
  font-weight: 800;
  color: var(--accent);
}

.game-focus {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
}

.game-focus:focus { box-shadow: none; }

.banner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-primary);
  border: 2px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 24px 48px;
  font-size: 36px;
  font-weight: 800;
  letter-spacing: 6px;
  color: var(--accent);
  z-index: 3;
  text-align: center;
  box-shadow: 0 0 40px var(--focus-glow);
}

/* GAME OVER */
.score-row {
  display: flex;
  gap: 32px;
}

.score-cell {
  background: var(--bg-primary);
  padding: 20px 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-tertiary);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 140px;
}

.score-label {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 3px;
  font-weight: 700;
}

.score-value {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-primary);
}

.new-best {
  color: var(--accent-secondary);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 3px;
  text-shadow: 0 0 16px rgba(0, 255, 136, 0.5);
}