/* Bit Merge styles — scoped ob-bm-* */
.ob-bm-root {
  --ob-bm-dark: #173b31;
  --ob-bm-cream: #f5f2e9;
  --ob-bm-lime: #d4e293;
  --ob-bm-amber: #e0812f;
  width: 100%;
  max-width: 380px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ob-bm-dark);
  touch-action: none;
}
.ob-bm-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.ob-bm-name {
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-right: auto;
}
.ob-bm-stat {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.1;
  min-width: 48px;
}
.ob-bm-stat i {
  font-style: normal;
  font-size: 10px;
  text-transform: uppercase;
  opacity: 0.7;
}
.ob-bm-stat b {
  font-size: 16px;
  font-variant-numeric: tabular-nums;
}
.ob-bm-btn {
  min-height: 44px;
  min-width: 44px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 2px solid var(--ob-bm-dark);
  background: var(--ob-bm-cream);
  color: var(--ob-bm-dark);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.ob-bm-btn:hover { background: var(--ob-bm-lime); }
.ob-bm-btn:focus-visible { outline: 3px solid var(--ob-bm-amber); outline-offset: 2px; }
.ob-bm-primary { background: var(--ob-bm-amber); color: var(--ob-bm-cream); border-color: var(--ob-bm-dark); }

.ob-bm-wrap {
  position: relative;
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1 / 1;
}
.ob-bm-board {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-rows: repeat(4, minmax(0, 1fr));
  gap: 8px;
  padding: 8px;
  background: var(--ob-bm-dark);
  border-radius: 14px;
}
.ob-bm-cell {
  background: rgba(245, 242, 233, 0.12);
  border-radius: 10px;
}
.ob-bm-tiles {
  position: absolute;
  inset: 8px;
}
.ob-bm-tile {
  position: absolute;
  width: calc((100% - 24px) / 4);
  height: calc((100% - 24px) / 4);
  left: calc(var(--c) * ((100% - 24px) / 4 + 8px));
  top: calc(var(--r) * ((100% - 24px) / 4 + 8px));
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  background: var(--ob-bm-cream);
  color: var(--ob-bm-dark);
  font-size: clamp(18px, 9vw, 34px);
  transition: left 120ms ease, top 120ms ease, transform 120ms ease;
}
@media (min-width: 420px) {
  .ob-bm-tile { font-size: 34px; }
}
.ob-bm-tile:not(.ob-bm-settled) { transform: scale(0.4); }
.ob-bm-v8 { background: #c9d97f; }
.ob-bm-v16 { background: #b6cf6c; color: #122c24; }
.ob-bm-v32 { background: #a3c258; color: #122c24; }
.ob-bm-v64 { background: #e6a25a; }
.ob-bm-v128 { background: #e0812f; color: #fff; font-size: clamp(16px, 7vw, 28px); }
.ob-bm-v256 { background: #d96f1f; color: #fff; font-size: clamp(16px, 7vw, 28px); }
.ob-bm-v512 { background: #b8540f; color: #fff; font-size: clamp(16px, 7vw, 28px); }
.ob-bm-v1024 { background: #8a3d07; color: var(--ob-bm-cream); font-size: clamp(14px, 6vw, 24px); }
.ob-bm-v2048 { background: var(--ob-bm-lime); color: var(--ob-bm-dark); box-shadow: 0 0 0 3px var(--ob-bm-amber), 0 0 18px rgba(224, 129, 47, 0.6); font-size: clamp(14px, 6vw, 24px); }

.ob-bm-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(23, 59, 49, 0.82);
  border-radius: 14px;
  z-index: 5;
}
.ob-bm-hide { display: none; }
.ob-bm-panel {
  text-align: center;
  color: var(--ob-bm-cream);
  padding: 16px;
}
.ob-bm-panel h3 {
  margin: 0 0 6px;
  font-size: 22px;
}
.ob-bm-panel p {
  margin: 0 0 14px;
  font-size: 14px;
  opacity: 0.9;
}
.ob-bm-ovbtns {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.ob-bm-pad {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 8px;
  max-width: 240px;
  margin: 0 auto;
  width: 100%;
}
.ob-bm-dir {
  min-width: 44px;
  min-height: 44px;
  border-radius: 12px;
  border: 2px solid var(--ob-bm-dark);
  background: var(--ob-bm-lime);
  color: var(--ob-bm-dark);
  font-size: 18px;
  cursor: pointer;
}
.ob-bm-dir:hover { background: var(--ob-bm-amber); color: var(--ob-bm-cream); }
.ob-bm-dir:focus-visible { outline: 3px solid var(--ob-bm-amber); outline-offset: 2px; }
.ob-bm-up { grid-column: 2; grid-row: 1; }
.ob-bm-left { grid-column: 1; grid-row: 2; }
.ob-bm-down { grid-column: 2; grid-row: 2; }
.ob-bm-right { grid-column: 3; grid-row: 2; }

@media (prefers-reduced-motion: reduce) {
  .ob-bm-tile { transition: none; }
  .ob-bm-tile:not(.ob-bm-settled) { transform: none; }
}
@media (max-width: 390px) {
  .ob-bm-root { gap: 8px; }
  .ob-bm-board, .ob-bm-wrap { max-width: 340px; }
  .ob-bm-tile { font-size: clamp(16px, 8.5vw, 30px); }
  .ob-bm-btn { padding: 8px 10px; }
}