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

body {
  overflow: hidden;
  background: #000;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

#game {
  display: block;
  width: 100vw;
  height: 100vh;
}

/* ── Back Button ── */
#back-btn {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 30;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.5);
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
  pointer-events: auto;
}
#back-btn:hover {
  color: #fff;
  background: rgba(0, 0, 0, 0.6);
}

/* ── Crosshair ── */
#crosshair {
  position: fixed;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 10;
}
#crosshair::before,
#crosshair::after {
  content: '';
  position: absolute;
  background: rgba(255, 255, 255, 0.7);
}
#crosshair::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  transform: translateY(-50%);
}
#crosshair::after {
  left: 50%;
  top: 0;
  width: 2px;
  height: 100%;
  transform: translateX(-50%);
}

/* ── Click Overlay ── */
#overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.82);
  z-index: 20;
  cursor: pointer;
  transition: opacity 0.3s;
}
#overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

#overlay-content {
  max-width: 520px;
  text-align: center;
}

#overlay-title {
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #4ea8ff, #fff 50%, #ff4e4e);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#overlay-controls {
  display: flex;
  gap: 2rem;
  justify-content: center;
  text-align: left;
  margin-bottom: 2rem;
}

.ctrl-col h3 {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #888;
  margin-bottom: 0.6rem;
}

.ctrl-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.35rem;
}

.ctrl-row span {
  font-size: 0.8rem;
  color: #999;
  margin-left: 0.3rem;
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 22px;
  padding: 0 0.4em;
  font-family: inherit;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #ddd;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

kbd.blue { border-color: rgba(78, 168, 255, 0.4); color: #4ea8ff; }
kbd.red  { border-color: rgba(255, 78, 78, 0.4); color: #ff4e4e; }

#overlay-hint {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50%      { opacity: 1; }
}

/* ── HUD ── */
#hud {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: flex-end;
  gap: 10px;
  z-index: 10;
  pointer-events: none;
  user-select: none;
}

.hand-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  opacity: 0.4;
  transition: opacity 0.15s, transform 0.15s, box-shadow 0.15s;
}
#hand-left {
  background: rgba(78, 168, 255, 0.25);
  color: #4ea8ff;
  border: 2px solid #4ea8ff;
}
#hand-right {
  background: rgba(255, 78, 78, 0.25);
  color: #ff4e4e;
  border: 2px solid #ff4e4e;
}
.hand-icon.active {
  opacity: 1;
  transform: scale(1.15);
  box-shadow: 0 0 12px currentColor;
}

/* Rope gauge */
#rope-gauge {
  display: flex;
  gap: 4px;
  align-items: flex-end;
}
.rope-track {
  width: 6px;
  height: 60px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}
.rope-bar {
  width: 100%;
  height: 100%;
  border-radius: 3px;
  transition: height 0.1s ease-out;
}
.rope-bar.blue { background: #4ea8ff; }
.rope-bar.red  { background: #ff4e4e; }