:root {
  --bg: radial-gradient(circle at top, #0d2c2c 0%, #041414 100%);
  --accent: #ffd166;
  --panel: rgba(255,255,255,0.05);
  --tile-size: 64px;
  --size: 8;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Arial;
}

* { box-sizing: border-box; }
html, body {
  height: 100%;
  margin: 0;
  padding: 0px;
  color: #fff;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
}

button {
  cursor: pointer;
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.08);
  color: inherit;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 15px;
  transition: background 0.2s;
}

button:hover {
  background: rgba(255,255,255,0.1);
}

#startscreen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  background: radial-gradient(circle at center,#052f2f,#021010);
  transition: opacity .6s ease;
}

#startscreen.hidden {
  opacity: 0;
  pointer-events: none;
}

h1 {
  font-size: 32px;
  margin: 0;
  color: var(--accent);
  text-shadow: 0 0 10px rgba(255,209,102,0.5);
}

.progress {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
}

#gamewrap {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  max-width: 100%;
}

header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  max-width: 800px;
  padding: 10px;
  align-items: center;
  text-align: center;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 15px;
  justify-content: center;
  padding: 5px;
  border-radius: 8px;
}

.controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

#scoreProgress {
  width: 100%;
  height: 16px;
  border-radius: 8px;
  margin-top: 4px;
}

/* Fortschrittsbalken Farbe #facc61 */
progress#scoreProgress::-webkit-progress-bar {
  background-color: rgba(255,255,255,0.1);
  border-radius: 8px;
}
progress#scoreProgress::-webkit-progress-value {
  background-color: #facc61;
  border-radius: 8px;
}
progress#scoreProgress::-moz-progress-bar {
  background-color: #facc61;
  border-radius: 8px;
}

.board {
  display: grid;
  gap: 6px;
  grid-template-columns: repeat(var(--size), var(--tile-size));
  grid-auto-rows: var(--tile-size);
  background: rgba(0,0,0,0.15);
  padding: 0px;
  border-radius: 12px;
  max-width: 100%;
}

.tile {
  width: var(--tile-size);
  height: var(--tile-size);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  background: linear-gradient(180deg,rgba(255,255,255,0.05),rgba(255,255,255,0.02));
  transition: transform .2s, box-shadow .2s;
}

.tile.selected {
  outline: 2px solid var(--accent);
  transform: scale(1.05);
  box-shadow: 0 0 15px var(--accent);
}

.tile.match {
  animation: matchAnim 0.5s forwards;
}

.tile.special {
  border: 2px solid #ff6;
  box-shadow: 0 0 10px #ff6;
}

@keyframes matchAnim {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.8; }
  100% { transform: scale(0); opacity: 0; }
}

.overlay {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.6);
  z-index: 10;
}

.overlay.show { display: flex; }

.modal {
  background: #fff;
  color: #111;
  padding: 20px;
  border-radius: 12px;
  text-align: center;
  max-width: 320px;
}

#leaderboardModal {
  background: rgba(0,0,0,0.9);
  color: #fff;
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 10px;
  z-index: 15;
}

#leaderboardModal.show { display: flex; }

table {
  border-collapse: collapse;
  color: #fff;
  font-size: 15px;
}

th, td {
  padding: 4px 8px;
  border-bottom: 1px solid rgba(255,255,255,0.2);
}

.timer {
  font-size: 16px;
  font-weight: bold;
  color: #ffd166;
  margin-left: 12px;
}

.audioControls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  margin-left: 0;
}

select {
  font-size: 15px;
  padding: 6px 12px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 8px;
  appearance: none;
  cursor: pointer;
  transition: background 0.2s, border 0.2s;
}

select:hover { background: rgba(255,255,255,0.1); }
select:focus { outline: none; border-color: var(--accent); }

#startGameBtn {
  margin-top: 20px;
  padding: 12px 24px;
  font-size: 18px;
  border-radius: 12px;
  width: 200px;
  background: #ffd166;
  color: #000;
}

#startGameBtn:hover {
  transform: scale(1.05);
  box-shadow: 0 0 25px rgba(255,209,102,0.8);
}

/* Responsive */
@media(max-width:430px){
  :root { --size: 6; }
  .tile { font-size: 24px; }
}
@media(max-width:600px){
  header { font-size: 14px; }
  .stats { gap: 8px; }
  button { font-size: 14px; padding: 8px 12px; }
}