/* 2048 — blue palette aligned with Sudoku/Minesweeper */

:root {
  --g48-bg: #ffffff;
  --g48-board: #bfc7d9;
  --g48-cell: #e4e8f0;
  --g48-text-dark: #1b2545;
  --g48-text-light: #ffffff;
  --g48-muted: #8891aa;
  --g48-border: #e4e8f0;
  --g48-blue-tint: #edf0fb;
  --g48-blue: #4a5fc1;
  --g48-blue-dark: #3b4ca0;

  --tile-2:   #edf0fb;
  --tile-4:   #dde3f5;
  --tile-8:   #c8d2ef;
  --tile-16:  #a9b8e6;
  --tile-32:  #8a9cdb;
  --tile-64:  #6b7fcf;
  --tile-128: #4a5fc1;
  --tile-256: #4255b2;
  --tile-512: #3b4ca0;
  --tile-1024:#33438c;
  --tile-2048:#2c3a78;
  --tile-super:#1b2545;
}

body { background: var(--g48-bg); color: var(--g48-text-dark); }

.g48-page {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
}

.page-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}
.back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  color: var(--g48-text-dark);
  transition: background 120ms;
}
.back-btn:hover { background: var(--g48-blue-tint); }
.page-header h1 { margin: 0; font-size: 1.5rem; font-weight: 600; color: var(--g48-text-dark); }

.g48-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: start;
}
@media (min-width: 900px) {
  .g48-layout {
    grid-template-columns: max-content 280px;
    gap: var(--space-2xl);
    justify-content: center;
  }
}

.board-column { min-width: 0; display: flex; flex-direction: column; align-items: center; }
.board-frame {
  position: relative;
  width: calc(var(--tile) * 4 + var(--gap) * 5);
  height: calc(var(--tile) * 4 + var(--gap) * 5);
  --tile: clamp(58px, 17vw, 90px);
  --gap: 8px;
  margin: 0 auto;
}
@media (min-width: 900px) {
  .board-frame { --tile: 100px; --gap: 12px; }
}

@media (max-width: 899px) {
  .g48-page { padding: var(--space-md); }
  .page-header { margin-bottom: var(--space-md); }
  .g48-layout { gap: var(--space-md); }
  .panel-column { gap: var(--space-md); }
  .ad-slot { margin-top: var(--space-md); }
}

.g48-board-bg {
  position: absolute;
  inset: 0;
  background: var(--g48-board);
  border-radius: 6px;
  padding: var(--gap);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: var(--gap);
}
.bg-cell {
  background: var(--g48-cell);
  border-radius: 3px;
}

.g48-board {
  position: absolute;
  inset: 0;
  padding: var(--gap);
  pointer-events: none;
}
.tile {
  position: absolute;
  width: var(--tile);
  height: var(--tile);
  left: calc(var(--gap) + var(--c) * (var(--tile) + var(--gap)));
  top: calc(var(--gap) + var(--r) * (var(--tile) + var(--gap)));
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  font-weight: 700;
  font-size: calc(var(--tile) * 0.45);
  line-height: 1;
  background: var(--tile-2);
  color: var(--g48-text-dark);
  transition: left 100ms ease, top 100ms ease;
  animation: spawn 140ms ease-out;
}

@keyframes spawn {
  from { transform: scale(0.6); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

.tile.t-2    { background: var(--tile-2);    color: var(--g48-text-dark); }
.tile.t-4    { background: var(--tile-4);    color: var(--g48-text-dark); }
.tile.t-8    { background: var(--tile-8);    color: var(--g48-text-dark); }
.tile.t-16   { background: var(--tile-16);   color: var(--g48-text-dark); }
.tile.t-32   { background: var(--tile-32);   color: var(--g48-text-light); }
.tile.t-64   { background: var(--tile-64);   color: var(--g48-text-light); }
.tile.t-128  { background: var(--tile-128);  color: var(--g48-text-light); font-size: calc(var(--tile) * 0.38); }
.tile.t-256  { background: var(--tile-256);  color: var(--g48-text-light); font-size: calc(var(--tile) * 0.38); }
.tile.t-512  { background: var(--tile-512);  color: var(--g48-text-light); font-size: calc(var(--tile) * 0.38); }
.tile.t-1024 { background: var(--tile-1024); color: var(--g48-text-light); font-size: calc(var(--tile) * 0.32); }
.tile.t-2048 { background: var(--tile-2048); color: var(--g48-text-light); font-size: calc(var(--tile) * 0.32); }
.tile.t-super { background: var(--tile-super); color: var(--g48-text-light); font-size: calc(var(--tile) * 0.28); }

.hint {
  text-align: center;
  color: var(--g48-muted);
  margin: var(--space-md) 0 0;
  font-size: 0.875rem;
}

/* Panel */
.panel-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  min-width: 0;
}

.score-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}
.score-card {
  background: var(--g48-blue);
  color: var(--g48-text-light);
  border-radius: 6px;
  padding: var(--space-sm);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.score-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.85;
}
.score-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* Direction pad */
.dpad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: var(--space-xs);
  width: 100%;
  max-width: 220px;
  margin: 0 auto;
  aspect-ratio: 3 / 3;
}
.dpad-btn {
  border: none;
  background: var(--g48-blue-tint);
  color: var(--g48-blue);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 120ms, transform 80ms;
}
.dpad-btn:hover { background: #dde3f5; }
.dpad-btn:active { transform: scale(0.95); }
.dpad-btn.up    { grid-column: 2; grid-row: 1; }
.dpad-btn.left  { grid-column: 1; grid-row: 2; }
.dpad-btn.right { grid-column: 3; grid-row: 2; }
.dpad-btn.down  { grid-column: 2; grid-row: 3; }

.action-row { display: flex; gap: var(--space-sm); justify-content: center; }
.icon-btn {
  width: 48px; height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--g48-blue-tint);
  color: var(--g48-blue);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 120ms, transform 80ms;
}
.icon-btn:hover { background: #dde3f5; }
.icon-btn:active { transform: scale(0.96); }

.new-game-btn {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  border: none;
  border-radius: 12px;
  background: var(--g48-blue);
  color: var(--g48-text-light);
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 120ms, transform 80ms;
  font-family: inherit;
}
.new-game-btn:hover { background: var(--g48-blue-dark); }
.new-game-btn:active { transform: translateY(1px); }
.new-game-btn.ghost {
  background: transparent;
  color: var(--g48-blue);
  border: 2px solid var(--g48-blue);
}
.new-game-btn.ghost:hover { background: var(--g48-blue-tint); }

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(27, 37, 69, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: var(--space-md);
}
.modal[hidden] { display: none; }
.modal-card {
  background: var(--g48-bg);
  border-radius: 16px;
  padding: var(--space-xl);
  max-width: 360px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 40px rgba(27, 37, 69, 0.2);
}
.modal-card h2 { margin: 0 0 var(--space-xs); font-size: 1.75rem; color: var(--g48-text-dark); }
.modal-card p { margin: 0 0 var(--space-md); color: var(--g48-muted); }
.modal-card .time {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--g48-blue);
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-lg);
}
.modal-actions { display: flex; flex-direction: column; gap: var(--space-sm); }

/* Ads */
.ad-label {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--g48-muted);
  margin-bottom: var(--space-xs);
  text-align: center;
}
.ad-unit {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--g48-blue-tint);
  color: var(--g48-blue);
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px dashed var(--g48-border);
}
.ad-300x600 { width: 300px; height: 600px; }
.ad-728x90 { width: 100%; max-width: 728px; height: 90px; margin: 0 auto; }
.ad-slot { margin: var(--space-2xl) auto 0; padding: 0; max-width: 728px; }

.game-footer {
  margin: var(--space-lg) auto 0;
  padding-top: var(--space-md);
  border-top: 1px solid var(--g48-border);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--g48-muted);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  max-width: 728px;
}
.game-footer a { color: var(--g48-muted); text-decoration: none; }
.game-footer a:hover { color: var(--g48-text-dark); text-decoration: underline; }
.side-ad { display: none; }

@media (min-width: 1500px) {
  .side-ad {
    display: block;
    width: 300px;
    z-index: 5;
    top: 120px;
    position: fixed;
  }
  .side-ad .ad-300x600 { width: 300px; height: 600px; }
  .side-ad-left { left: calc((100vw - 1100px) / 2 - 340px); }
  .side-ad-right { right: calc((100vw - 1100px) / 2 - 340px); }
}