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

:root {
  --mint: #7dffce;
  --danger: #ff5470;
  --bg: #0a1016;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: #eaf4f2;
  -webkit-user-select: none;
  user-select: none;
}

#game {
  position: fixed;
  inset: 0;
  display: block;
}

/* ---------- HUD ---------- */
#hud {
  position: fixed;
  top: 12px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 8px 26px;
  pointer-events: none;
}

.hud-left, .hud-right { display: flex; flex-direction: column; gap: 3px; }
.hud-right { text-align: right; }

.hud-label { font-size: 10px; letter-spacing: 2px; color: #5f8a80; }

.hud-value {
  font-size: 23px;
  font-weight: 700;
  color: var(--mint);
  text-shadow: 0 0 10px rgba(125,255,206,.45);
  font-variant-numeric: tabular-nums;
}

.hud-center {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
}

.diffs { display: flex; gap: 8px; }

.diff-btn {
  padding: 5px 16px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  font-family: inherit;
  color: #9fc4bb;
  background: rgba(125,255,206,.05);
  border: 1px solid rgba(125,255,206,.3);
  border-radius: 14px;
  cursor: pointer;
  pointer-events: auto;
}

.diff-btn:hover { border-color: var(--mint); color: var(--mint); }
.diff-btn.active { background: rgba(125,255,206,.18); color: var(--mint); border-color: var(--mint); }

.btn-new {
  margin-top: 2px;
  padding: 6px 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  font-family: inherit;
  color: #06120d;
  background: var(--mint);
  border: none;
  border-radius: 16px;
  cursor: pointer;
  pointer-events: auto;
  box-shadow: 0 0 16px rgba(125,255,206,.35);
}

.btn-new:hover { transform: translateY(-1px); box-shadow: 0 4px 22px rgba(125,255,206,.5); }

.best-line { font-size: 11.5px; letter-spacing: 1px; color: #ffd166; min-height: 15px; }

/* ---------- Overlays ---------- */
.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 17px;
  text-align: center;
  background: radial-gradient(ellipse at center, rgba(9,19,24,.87) 0%, rgba(10,16,22,.97) 100%);
  z-index: 10;
  padding: 24px;
}

.hidden { display: none !important; }

.game-title {
  font-size: clamp(50px, 10vw, 100px);
  font-weight: 800;
  letter-spacing: 14px;
  line-height: 1;
  color: #f0fbf8;
  margin-left: 14px;
}

.game-title span { color: var(--mint); text-shadow: 0 0 28px var(--mint), 0 0 70px rgba(125,255,206,.4); }

.tagline {
  font-size: clamp(13px, 2vw, 18px);
  letter-spacing: 5px;
  text-transform: uppercase;
  color: var(--danger);
  text-shadow: 0 0 14px rgba(255,84,112,.5);
}

.rules p { margin: 4px 0; color: #b0cfc6; font-size: clamp(12.5px, 1.65vw, 15px); }
.rules strong { color: var(--mint); }
.rules p:nth-child(4) strong { color: var(--gold, #ffd166); }

.btn {
  margin-top: 6px;
  padding: 15px 44px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--mint);
  background: transparent;
  border: 2px solid var(--mint);
  border-radius: 40px;
  cursor: pointer;
  transition: all .18s;
}

.btn:hover {
  background: rgba(125,255,206,.13);
  box-shadow: 0 0 30px rgba(125,255,206,.5), inset 0 0 20px rgba(125,255,206,.15);
  transform: translateY(-2px);
}

.btn.secondary { color: #93b8ae; border-color: rgba(147,184,174,.5); }
.btn.secondary:hover { background: rgba(147,184,174,.09); box-shadow: none; }

.best { font-size: 13px; letter-spacing: 2px; color: var(--gold); }

h2 { font-size: clamp(28px, 5.5vw, 46px); letter-spacing: 7px; color: #f0fbf8; }

.end-title { color: var(--mint); text-shadow: 0 0 26px var(--mint); }
.end-title.lost { color: var(--danger); text-shadow: 0 0 26px var(--danger), 0 0 70px rgba(255,84,112,.35); }

.final-wrap { display: flex; flex-direction: column; gap: 6px; align-items: center; }

.final-score {
  font-size: clamp(42px, 8vw, 72px);
  font-weight: 800;
  color: var(--mint);
  text-shadow: 0 0 30px var(--mint);
  font-variant-numeric: tabular-nums;
}

.dim { color: #7fa39a; }
.btn-row { display: flex; gap: 13px; flex-wrap: wrap; justify-content: center; }