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

body {
  background: #030a14;
  font-family: 'DM Sans', system-ui, sans-serif;
  overflow: hidden;
}

/* ─── Three.js renderer (appended to body by JS) ────────────────────────── */

#game-renderer {
  position: fixed;
  inset: 0;
  z-index: 0;
}

/* ─── 2D overlay canvas (labels, HUD, countdown) ────────────────────────── */

#label-canvas {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  width: 100%;
  height: 100%;
}

/* ─── In-game title bar ──────────────────────────────────────────────────── */

#game-title-bar {
  display: none;
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  padding: 0.55rem 2.2rem;
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(180, 215, 255, 0.45);
  background: rgba(3, 10, 22, 0.55);
  border-bottom: 1px solid rgba(90, 160, 255, 0.10);
  border-left: 1px solid rgba(90, 160, 255, 0.08);
  border-right: 1px solid rgba(90, 160, 255, 0.08);
  border-radius: 0 0 12px 12px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  pointer-events: none;
}

/* ─── UI overlay ─────────────────────────────────────────────────────────── */

#ui {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 10;
}

.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 1.1rem;
  pointer-events: all;
  text-align: center;
  background: rgba(3, 10, 22, 0.86);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border: 1px solid rgba(90, 160, 255, 0.14);
  border-radius: 22px;
  padding: 3rem 4.5rem;
  box-shadow: 0 8px 60px rgba(0,0,0,0.6);
}

.screen.active {
  display: flex;
}

/* ─── Typography ─────────────────────────────────────────────────────────── */

.game-title {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 3.2rem;
  color: #e8f4ff;
  letter-spacing: -1.5px;
  line-height: 1;
}

.subtitle {
  color: rgba(180, 215, 255, 0.6);
  font-size: 1.05rem;
  font-weight: 400;
}

.controls-hint {
  padding: 0.45rem 1.4rem;
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(180, 215, 255, 0.45);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

.credits {
  color: rgba(180, 215, 255, 0.28);
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  margin-top: 0.2rem;
}

/* ─── Button ─────────────────────────────────────────────────────────────── */

.btn-primary {
  margin-top: 0.4rem;
  padding: 0.72rem 3.2rem;
  background: linear-gradient(140deg, #3b82f6 0%, #1d4ed8 100%);
  color: #fff;
  border: none;
  border-radius: 60px;
  font-family: 'DM Sans', sans-serif;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 4px 24px rgba(59, 130, 246, 0.38);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(59, 130, 246, 0.55);
}

.btn-primary:active {
  transform: translateY(0);
}

/* ─── Round-end screen ───────────────────────────────────────────────────── */

#roundend-title {
  font-family: 'Syne', sans-serif;
  font-size: 2.4rem;
  font-weight: 800;
  color: #e8f4ff;
  letter-spacing: -1px;
}

#roundend-sub {
  color: rgba(180, 215, 255, 0.6);
  font-size: 1rem;
}