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

:root {
  --tile: 48px;
  --bg: #2a1a0e;
  --panel: #3e2723;
  --panel-light: #5d4037;
  --floor: #6e3e1c;
  --floor-dark: #4e2c14;
  --void: #1a0d04;
  --text: #f4e9d8;
  --muted: #c8b89c;
  --accent: #e09020;
  --success: #6ec46e;
  --success-bg: #2e5e2e;
  --error: #d44b4b;
  --button: #5d4037;
  --button-hover: #795548;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px;
  padding-top: env(safe-area-inset-top, 12px);
  padding-bottom: env(safe-area-inset-bottom, 12px);
  min-height: 100vh;
}

.app { width: 100%; max-width: 800px; flex: 1; }

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--panel);
  color: var(--text);
  border-radius: 10px;
  margin-bottom: 12px;
  gap: 8px;
  flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 15px; color: var(--accent); }
.stats { font-size: 13px; color: var(--muted); }
.stats strong { color: var(--accent); }

.screen {
  background: var(--panel);
  padding: 16px;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  color: var(--text);
}
.hidden { display: none !important; }
.screen h2 { margin-bottom: 12px; color: var(--accent); font-size: 18px; }
.screen p { margin-bottom: 10px; color: var(--muted); font-size: 14px; line-height: 1.4; }
.screen .hint { font-size: 12px; color: var(--muted); margin-top: 8px; opacity: 0.8; }

#nickname-input {
  width: 100%;
  padding: 10px 12px;
  font-size: 16px;
  border: 2px solid var(--panel-light);
  border-radius: 6px;
  margin-bottom: 12px;
  background: var(--floor-dark);
  color: var(--text);
}
#nickname-input:focus { outline: none; border-color: var(--accent); }

#start-btn, #next-level-btn, .back-btn {
  background: var(--button);
  color: var(--text);
  border: 1px solid var(--panel-light);
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  width: 100%;
}
#start-btn:hover, .back-btn:hover, #next-level-btn:hover { background: var(--button-hover); }
#next-level-btn {
  background: var(--success);
  color: white;
  width: auto;
  padding: 8px 16px;
  border-color: var(--success);
}
#next-level-btn:hover { background: #5aa85a; }

.level-name {
  text-align: center;
  font-style: italic;
  color: var(--muted);
  margin-bottom: 10px;
  min-height: 18px;
  font-size: 13px;
}

/* ─── BOARD ─── */
.board {
  display: grid;
  gap: 0;
  background: var(--void);
  padding: 6px;
  border-radius: 6px;
  margin: 0 auto 12px;
  user-select: none;
  touch-action: none;
  width: fit-content;
  justify-content: center;
  border: 2px solid var(--panel-light);
  /* Centrar el contenido cuando es estrecho */
  max-width: 100%;
  overflow: auto;
}

.cell {
  width: var(--tile);
  height: var(--tile);
  background-color: var(--floor);
  background-size: 100% 100%;
  background-repeat: no-repeat;
  background-position: center;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}
.cell.void  { background-color: var(--void); }
.cell.wall  { background-image: url('/assets/wall.png');  background-color: transparent; }
.cell.floor { /* solo color sólido del fondo */ }

.cell.target        { background-image: url('/assets/target.png'); }
.cell.box           { background-image: url('/assets/box.png'); }
.cell.box-on-target { background-image: url('/assets/box_on_target.png'); }

/* Player: usar 2 capas (player encima del piso/destino) */
.cell.player.player-down  { background-image: url('/assets/player_down.png'); }
.cell.player.player-up    { background-image: url('/assets/player_up.png'); }
.cell.player.player-left  { background-image: url('/assets/player_left.png'); }
.cell.player.player-right { background-image: url('/assets/player_right.png'); }
.cell.player.player-on-target.player-down  { background-image: url('/assets/player_down.png'),  url('/assets/target.png'); }
.cell.player.player-on-target.player-up    { background-image: url('/assets/player_up.png'),    url('/assets/target.png'); }
.cell.player.player-on-target.player-left  { background-image: url('/assets/player_left.png'),  url('/assets/target.png'); }
.cell.player.player-on-target.player-right { background-image: url('/assets/player_right.png'), url('/assets/target.png'); }

.win-message {
  display: none;
  background: var(--success-bg);
  color: var(--text);
  padding: 12px;
  border-radius: 6px;
  text-align: center;
  margin-bottom: 12px;
  font-weight: 600;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  border: 2px solid var(--success);
}
.win-message.visible { display: flex; }

.pad {
  display: grid;
  grid-template-columns: repeat(3, 56px);
  gap: 6px;
  justify-content: center;
  margin: 8px 0;
}
.pad .empty { visibility: hidden; }
.pad button {
  width: 56px; height: 56px;
  border: 1px solid var(--panel-light);
  background: var(--button);
  color: var(--text);
  font-size: 22px;
  border-radius: 8px;
  cursor: pointer;
  touch-action: manipulation;
}
.pad button:active { background: var(--button-hover); transform: scale(0.95); }

.actions {
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
}
.actions button {
  padding: 8px 14px;
  border: 1px solid var(--panel-light);
  background: var(--floor-dark);
  color: var(--text);
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
}
.actions button:hover { background: var(--button); }
.actions button:active { background: var(--button-hover); }

#levels-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}
#levels-list button {
  aspect-ratio: 1;
  background: var(--floor-dark);
  border: 1px solid var(--panel-light);
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  border-radius: 6px;
  cursor: pointer;
}
#levels-list button:hover { background: var(--button); }
#levels-list button.completed {
  background: var(--success-bg);
  border-color: var(--success);
  color: var(--success);
}
#levels-list button.completed::after { content: " ✓"; font-size: 12px; }

.tabs { display: flex; gap: 4px; margin-bottom: 12px; }
.tabs .tab {
  flex: 1;
  padding: 8px;
  background: var(--floor-dark);
  border: 1px solid var(--panel-light);
  color: var(--text);
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
}
.tabs .tab.active { background: var(--accent); color: var(--bg); border-color: var(--accent); }

#ranking-content { max-height: 50vh; overflow-y: auto; }
#ranking-content table { width: 100%; border-collapse: collapse; font-size: 14px; }
#ranking-content th, #ranking-content td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--panel-light);
  text-align: left;
}
#ranking-content th { color: var(--muted); font-weight: 600; font-size: 12px; }
#ranking-content tr:hover { background: var(--floor-dark); }

.back-btn { margin-top: 12px; }

footer.credits {
  margin-top: 16px;
  padding: 12px;
  color: var(--muted);
  font-size: 11px;
  text-align: center;
  line-height: 1.6;
}
footer.credits a { color: var(--accent); text-decoration: none; }
footer.credits a:hover { text-decoration: underline; }

@media (max-width: 720px) { :root { --tile: 40px; } }
@media (max-width: 560px) { :root { --tile: 32px; } }
@media (max-width: 420px) { :root { --tile: 26px; } }
@media (max-width: 340px) { :root { --tile: 22px; } }

@media (max-width: 480px) {
  .stats { font-size: 11px; }
  .brand { font-size: 14px; }
  .pad { grid-template-columns: repeat(3, 48px); }
  .pad button { width: 48px; height: 48px; font-size: 18px; }
}