:root {
  --bg: #05060a;
  --fg: #e6f6ff;
  --accent: #4dd6ff;
  --accent-strong: #7af0ff;
  --warn: #ff5577;
  --dim: #8090a0;
  --panel: rgba(8, 12, 20, 0.78);
  --panel-border: rgba(77, 214, 255, 0.25);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

#game-canvas {
  position: fixed;
  inset: 0;
  display: block;
  width: 100vw;
  height: 100vh;
}

.hidden { display: none !important; }

/* ---------- Overlays (Menü / Game Over) ---------- */
.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  background: radial-gradient(circle at center, rgba(10, 18, 30, 0.6), rgba(0, 0, 0, 0.85));
  z-index: 10;
  padding: 2rem;
  text-align: center;
}

.title {
  font-size: clamp(1.3rem, 6.5vw, 4rem);
  letter-spacing: 0.4em;
  margin: 0;
  color: var(--accent-strong);
  text-shadow: 0 0 18px rgba(122, 240, 255, 0.6), 0 0 4px rgba(122, 240, 255, 0.9);
  font-weight: 300;
}

.subtitle {
  margin: 0;
  color: var(--dim);
  letter-spacing: 0.15em;
  font-size: clamp(0.8rem, 1.8vmin, 1rem);
  text-transform: uppercase;
}

.go-title {
  font-size: clamp(1.6rem, 5vmin, 2.6rem);
  letter-spacing: 0.3em;
  margin: 0;
  color: var(--fg);
  font-weight: 300;
}

.go-score {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.go-score .lbl {
  color: var(--dim);
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  text-transform: uppercase;
}
#final-score {
  font-size: clamp(2.5rem, 8vmin, 4rem);
  color: var(--accent-strong);
  text-shadow: 0 0 14px rgba(122, 240, 255, 0.6);
}

.new-hi {
  margin: 0;
  color: var(--warn);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.9rem;
  animation: pulse 1.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.7; }
  50%      { opacity: 1; }
}

.go-buttons {
  display: flex;
  gap: 1rem;
}

.level-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  width: min(320px, 80vw);
}

.btn {
  background: var(--panel);
  color: var(--fg);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  font-size: 1rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.25rem;
  font-family: inherit;
}
.btn:hover, .btn:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 14px rgba(77, 214, 255, 0.4);
  outline: none;
}
.btn:active {
  transform: scale(0.98);
}
.btn.small {
  padding: 0.7rem 1.4rem;
  flex-direction: row;
  align-items: center;
}
.btn-label {
  font-size: 1.2rem;
  color: var(--accent-strong);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.btn-meta {
  font-size: 0.78rem;
  color: var(--dim);
  letter-spacing: 0.1em;
}
.hi-score {
  font-size: 0.72rem;
  color: var(--dim);
  letter-spacing: 0.1em;
  margin-top: 0.2rem;
}

.hint {
  color: var(--dim);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  margin: 0;
}

/* ---------- HUD ---------- */
#hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 5;
  font-size: clamp(0.85rem, 1.8vmin, 1rem);
}

.hud-left, .hud-right {
  position: absolute;
  top: 1rem;
  display: flex;
  gap: 1rem;
  pointer-events: auto;
}
.hud-left  { left: 1rem; flex-direction: column; gap: 0.3rem; }
.hud-right { right: 1rem; align-items: center; }

.hud-row {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  min-width: 70px;
}
.hud-right .hud-row {
  flex-direction: column;
  align-items: center;
}
.lbl {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--dim);
  text-transform: uppercase;
}
#score, #combo, #remaining {
  color: var(--accent-strong);
  font-size: 1.25rem;
  font-variant-numeric: tabular-nums;
}

.icon-btn {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  color: var(--fg);
  font-size: 1rem;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  cursor: pointer;
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.icon-btn:hover {
  border-color: var(--accent);
}

.hud-bottom {
  position: absolute;
  bottom: 1.2rem;
  left: 50%;
  transform: translateX(-50%);
  width: min(420px, 70vw);
  pointer-events: none;
}
#timer-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid var(--panel-border);
}
#timer-fill {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  box-shadow: 0 0 10px rgba(122, 240, 255, 0.6);
  transition: width 0.1s linear, background 0.3s ease;
}
#timer-fill.low {
  background: linear-gradient(90deg, var(--warn), #ff8a8a);
}