/* 2048 – Neon-Arcade-Variante (amber accent, passend zu game.json). */

:root {
  --bg:       #0a0a14;
  --bg-2:     #161028;
  --fg:       #e8e8ff;
  --muted:    #9a9ac0;
  --accent:   #f5b14c;
  --accent-2: #ff7a59;
  --board-bg: rgba(255, 255, 255, 0.04);
  --cell-bg:  rgba(255, 255, 255, 0.05);
  --gap:      clamp(8px, 2.2vw, 14px);
  --radius:   12px;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
html { -webkit-text-size-adjust: 100%; }

body {
  min-height: 100vh;
  background: radial-gradient(900px 500px at 50% -10%, var(--bg-2), var(--bg) 60%);
  color: var(--fg);
  font: 16px/1.5 ui-sans-serif, system-ui, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  align-items: center;
  overscroll-behavior: none;
}

.bg-grid {
  position: fixed; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(245, 177, 76, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 122, 89, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(800px 460px at 50% 0%, #000 30%, transparent 80%);
}

/* Kopfzeile */
.top {
  width: 100%;
  max-width: 480px;
  padding: 1rem 1.1rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.back {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.back:hover { color: var(--accent); }
.scores { display: flex; gap: 0.6rem; }
.score-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 76px;
  padding: 0.35rem 0.7rem;
  background: var(--board-bg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: 1.2rem;
}
.score-label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

/* Hauptbereich */
.wrap {
  width: 100%;
  max-width: 480px;
  padding: 0.6rem 1.1rem 2.5rem;
}
.title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 0.4rem 0 0.2rem;
}
.game-title {
  margin: 0;
  font-size: clamp(2.2rem, 9vw, 3rem);
  font-weight: 900;
  letter-spacing: 0.04em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 14px rgba(245, 177, 76, 0.4));
}
.hint { color: var(--muted); font-size: 0.85rem; margin: 0.2rem 0 1rem; }

.btn {
  font: inherit;
  font-weight: 700;
  color: var(--fg);
  background: var(--board-bg);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 10px;
  padding: 0.55rem 1rem;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
}
.btn:hover { border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  border-color: transparent;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #1a1208;
  box-shadow: 0 8px 24px -10px var(--accent);
}

/* Spielfeld */
.board {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  margin-top: 0.5rem;
  padding: var(--gap);
  background: var(--board-bg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}
.grid-bg {
  position: absolute;
  inset: var(--gap);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: var(--gap);
}
.cell { background: var(--cell-bg); border-radius: var(--radius); }

.tile-layer { position: absolute; inset: var(--gap); }

/* Eine Kachel: Position über --r/--c (Zeile/Spalte), responsive via calc. */
.tile {
  --tile-size: calc((100% - 3 * var(--gap)) / 4);
  position: absolute;
  width: var(--tile-size);
  height: var(--tile-size);
  top: calc((var(--tile-size) + var(--gap)) * var(--r));
  left: calc((var(--tile-size) + var(--gap)) * var(--c));
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-weight: 900;
  font-size: clamp(1.3rem, 7vw, 2rem);
  font-variant-numeric: tabular-nums;
  color: #1a1208;
  background: #cdc1b4;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.15);
  transition: top 0.12s ease, left 0.12s ease;
  will-change: top, left;
}

/* Kachel-Farben nach Wert */
.tile-2    { background: linear-gradient(160deg, #f2e9dc, #e7d8c3); }
.tile-4    { background: linear-gradient(160deg, #f3e0b8, #ecd09a); }
.tile-8    { background: linear-gradient(160deg, #ffc987, #ffa95e); color: #2a1606; }
.tile-16   { background: linear-gradient(160deg, #ffab6b, #ff8a4c); color: #2a1606; }
.tile-32   { background: linear-gradient(160deg, #ff8f6b, #ff6a4c); color: #fff; }
.tile-64   { background: linear-gradient(160deg, #ff6f6b, #ff4c5e); color: #fff; }
.tile-128  { background: linear-gradient(160deg, #ffd76b, #ffb74c); color: #2a1606; font-size: clamp(1.1rem, 6vw, 1.75rem); box-shadow: inset 0 0 0 1px rgba(255,255,255,.2), 0 0 22px -6px #ffce4c; }
.tile-256  { background: linear-gradient(160deg, #ffce5a, #ffaf3c); color: #2a1606; font-size: clamp(1.1rem, 6vw, 1.75rem); box-shadow: inset 0 0 0 1px rgba(255,255,255,.2), 0 0 26px -6px #ffba3c; }
.tile-512  { background: linear-gradient(160deg, #ffc24a, #ff9f2c); color: #2a1606; font-size: clamp(1.1rem, 6vw, 1.75rem); box-shadow: inset 0 0 0 1px rgba(255,255,255,.2), 0 0 30px -6px #ffaa2c; }
.tile-1024 { background: linear-gradient(160deg, #c77dff, #8a4cff); color: #fff; font-size: clamp(0.95rem, 5vw, 1.5rem); box-shadow: inset 0 0 0 1px rgba(255,255,255,.25), 0 0 34px -6px #9a5cff; }
.tile-2048 { background: linear-gradient(160deg, #5cf0ff, #4c9bff); color: #06222a; font-size: clamp(0.95rem, 5vw, 1.5rem); box-shadow: inset 0 0 0 1px rgba(255,255,255,.3), 0 0 40px -4px #5cf0ff; }
.tile-super{ background: linear-gradient(160deg, #ff5cf0, #8a4cff); color: #fff; font-size: clamp(0.9rem, 4.6vw, 1.4rem); box-shadow: inset 0 0 0 1px rgba(255,255,255,.3), 0 0 44px -4px #ff5cf0; }

/* Animationen */
.tile-new    { animation: pop-in 0.16s ease; }
.tile-merged { animation: pop-merge 0.16s ease; z-index: 2; }

@keyframes pop-in {
  0%   { transform: scale(0); }
  100% { transform: scale(1); }
}
@keyframes pop-merge {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.18); }
  100% { transform: scale(1); }
}

/* Overlay (Sieg / Game Over) */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.1rem;
  text-align: center;
  background: rgba(10, 10, 20, 0.82);
  backdrop-filter: blur(3px);
  border-radius: var(--radius);
  z-index: 3;
  animation: fade-in 0.25s ease;
}
.overlay[hidden] { display: none; }
.overlay-text {
  margin: 0;
  font-size: clamp(1.6rem, 8vw, 2.4rem);
  font-weight: 900;
  letter-spacing: 0.03em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.overlay.win .overlay-text {
  background: linear-gradient(90deg, #5cf0ff, #4c9bff);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.overlay-actions { display: flex; gap: 0.7rem; flex-wrap: wrap; justify-content: center; }
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }

/* Score-Eintrag im Overlay */
.overlay-score {
  margin: 0;
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--fg);
}
.overlay-score[hidden] { display: none; }
.score-form { width: min(100%, 320px); display: flex; flex-direction: column; gap: 0.5rem; }
.score-form[hidden] { display: none; }
.score-form-label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--accent);
}
.score-form-row { display: flex; gap: 0.5rem; }
#player-name {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-weight: 700;
  color: var(--fg);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 10px;
  padding: 0.55rem 0.7rem;
}
#player-name:focus { outline: none; border-color: var(--accent); }
.btn:disabled { opacity: 0.55; cursor: default; }

/* Bestenliste */
.leaderboard {
  width: 100%;
  max-width: 480px;
  padding: 0 1.1rem;
  margin-top: 1.6rem;
}
.lb-title {
  margin: 0 0 0.6rem;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.lb-list { list-style: none; margin: 0; padding: 0; }
.lb-empty { color: var(--muted); font-size: 0.9rem; padding: 0.4rem 0; }
.lb-row {
  display: grid;
  grid-template-columns: 2.6rem 1fr auto;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 10px;
  margin-bottom: 0.35rem;
  background: var(--board-bg);
}
.lb-rank { font-weight: 800; color: var(--muted); font-variant-numeric: tabular-nums; }
.lb-name {
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lb-score { font-weight: 800; font-variant-numeric: tabular-nums; }
.lb-row--me {
  border-color: color-mix(in srgb, var(--accent) 65%, transparent);
  box-shadow: 0 0 22px -10px var(--accent);
}
.lb-row--me .lb-rank { color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  .tile { transition: none; }
  .tile-new, .tile-merged, .overlay { animation: none; }
}