.game-root {
  min-height: 34rem;
}

.ws-board-wrap {
  --ws-cap: 4;
  --ws-rows: 1;
  --ws-per-row: 8; /* desktop wrap; mobile overrides to 6 */
  --ws-tube-w: 3rem;
  --ws-tube-h: calc(2.35rem * var(--ws-cap) + 1.25rem);
  --ws-row-gap: 0.85rem;
  --ws-col-gap: 0.95rem; /* desktop breathing room; mobile tightens */
  min-height: calc(var(--ws-tube-h) * var(--ws-rows) + var(--ws-row-gap) * (var(--ws-rows) - 1) + 2.5rem);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0.75rem 0.25rem 1rem;
  overflow-x: auto;
  scrollbar-gutter: stable;
}

.ws-board {
  /* Flex wrap centers partial rows; width cap keeps the same per-row wrap as before. */
  --ws-board-max: calc(
    var(--ws-per-row) * var(--ws-tube-w) + (var(--ws-per-row) - 1) * var(--ws-col-gap)
  );
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-end;
  column-gap: var(--ws-col-gap);
  row-gap: var(--ws-row-gap);
  touch-action: manipulation;
  min-height: calc(var(--ws-tube-h) * var(--ws-rows) + var(--ws-row-gap) * (var(--ws-rows) - 1));
  width: fit-content;
  max-width: min(100%, var(--ws-board-max));
}

.ws-tube {
  --ws-cap: 4;
  --ws-glass-r: 1.1rem;
  --ws-neck-h: 0.45rem;
  --ws-pad: 1px;
  /* Full liquid stops a couple of pixels below the rim, not into the neck. */
  --ws-pad-top: calc(var(--ws-neck-h) + 3px);
  /* Liquid follows the inner glass curve: outer radius − border − pad. */
  --ws-bottom-r: calc(var(--ws-glass-r) - 2px - var(--ws-pad));
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  flex: 0 0 var(--ws-tube-w);
  width: var(--ws-tube-w);
  max-width: var(--ws-tube-w);
  min-width: var(--tap-min);
  height: var(--ws-tube-h);
  min-height: var(--ws-tube-h);
  padding: var(--ws-pad-top) var(--ws-pad) var(--ws-pad);
  border: 2px solid #6a7380;
  border-top: none;
  border-radius: 0 0 var(--ws-glass-r) var(--ws-glass-r);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18), transparent 28%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.12), transparent 18%, transparent 82%, rgba(0, 0, 0, 0.06)),
    color-mix(in srgb, var(--bg-elevated, #f4f6f8) 88%, #c8d0da);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.ws-tube::before {
  content: '';
  position: absolute;
  left: -0.2rem;
  right: -0.2rem;
  top: 0;
  height: var(--ws-neck-h);
  border: 2px solid #6a7380;
  border-bottom: none;
  border-radius: 0.35rem 0.35rem 0 0;
  background: color-mix(in srgb, var(--bg-elevated, #f4f6f8) 70%, #b8c0ca);
  pointer-events: none;
}

.ws-tube:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.ws-tube.is-selected {
  border-color: var(--gold);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--gold) 45%, transparent);
}

.ws-tube.is-legal {
  border-color: color-mix(in srgb, var(--success) 70%, #6a7380);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--success) 35%, transparent);
}

.ws-tube.is-complete {
  border-color: color-mix(in srgb, var(--success) 55%, #6a7380);
}

.ws-fill {
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-start;
  gap: 0;
  height: 100%;
  width: 100%;
  pointer-events: none;
}

/* Contiguous same-color units fuse into one solid block (no internal seams). */
.ws-block {
  --ws-units: 1;
  flex: 0 0 calc(100% * var(--ws-units) / var(--ws-cap));
  border-radius: 0;
  position: relative;
  overflow: hidden;
}

/* DOM order is bottom→top; column-reverse puts first child at the bottom. */
.ws-block:first-child {
  border-radius: 0 0 var(--ws-bottom-r) var(--ws-bottom-r);
}

.ws-block:last-child {
  border-radius: 1px 1px 0 0;
}

.ws-block:only-child {
  border-radius: 1px 1px var(--ws-bottom-r) var(--ws-bottom-r);
}

.ws-block.is-flying {
  visibility: hidden;
}

/* Pattern marks so the puzzle is not color-only */
.ws-block[data-mark='dots'],
.ws-flight-block[data-mark='dots'] {
  background-image: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.55) 1.4px, transparent 1.6px);
  background-size: 7px 7px;
}

.ws-block[data-mark='stripes'],
.ws-flight-block[data-mark='stripes'] {
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(255, 255, 255, 0.35) 0 3px,
    transparent 3px 7px
  );
}

.ws-block[data-mark='checks'],
.ws-flight-block[data-mark='checks'] {
  background-image:
    linear-gradient(45deg, rgba(0, 0, 0, 0.12) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(0, 0, 0, 0.12) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(0, 0, 0, 0.12) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(0, 0, 0, 0.12) 75%);
  background-size: 8px 8px;
  background-position: 0 0, 0 4px, 4px -4px, -4px 0;
}

.ws-block[data-mark='grid'],
.ws-flight-block[data-mark='grid'] {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.35) 1px, transparent 1px);
  background-size: 6px 6px;
}

.ws-block[data-mark='waves'],
.ws-flight-block[data-mark='waves'] {
  background-image: repeating-radial-gradient(
    circle at 0 0,
    transparent 0,
    transparent 3px,
    rgba(255, 255, 255, 0.28) 3px,
    rgba(255, 255, 255, 0.28) 4px
  );
  background-size: 10px 10px;
}

.ws-block[data-mark='diag'],
.ws-flight-block[data-mark='diag'] {
  background-image: repeating-linear-gradient(
    45deg,
    rgba(0, 0, 0, 0.14) 0 2px,
    transparent 2px 6px
  );
}

.ws-block[data-mark='rings'],
.ws-flight-block[data-mark='rings'] {
  background-image: radial-gradient(circle, transparent 35%, rgba(255, 255, 255, 0.4) 36%, rgba(255, 255, 255, 0.4) 42%, transparent 43%);
  background-size: 10px 10px;
}

.ws-block[data-mark='hash'],
.ws-flight-block[data-mark='hash'] {
  background-image:
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.3) 0 1px, transparent 1px 5px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.3) 0 1px, transparent 1px 5px);
}

.ws-block[data-mark='dash'],
.ws-flight-block[data-mark='dash'] {
  background-image: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.4) 0 4px,
    transparent 4px 8px
  );
}

.ws-block[data-mark='plus'],
.ws-flight-block[data-mark='plus'] {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.45), rgba(255, 255, 255, 0.45)),
    linear-gradient(rgba(255, 255, 255, 0.45), rgba(255, 255, 255, 0.45));
  background-size: 8px 2px, 2px 8px;
  background-position: center;
  background-repeat: no-repeat;
}

.ws-block[data-mark='bars'],
.ws-flight-block[data-mark='bars'] {
  background-image: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.4) 0 2px,
    transparent 2px 6px
  );
}

.ws-block[data-mark='vlines'],
.ws-flight-block[data-mark='vlines'] {
  background-image: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.4) 0 2px,
    transparent 2px 6px
  );
}

.ws-block[data-mark='zig'],
.ws-flight-block[data-mark='zig'] {
  background-image: repeating-linear-gradient(
    -60deg,
    rgba(255, 255, 255, 0.38) 0 2px,
    transparent 2px 7px
  );
}

.ws-block[data-mark='diamond'],
.ws-flight-block[data-mark='diamond'] {
  background-image:
    linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.4) 40%, rgba(255, 255, 255, 0.4) 60%, transparent 60%),
    linear-gradient(-45deg, transparent 40%, rgba(255, 255, 255, 0.4) 40%, rgba(255, 255, 255, 0.4) 60%, transparent 60%);
  background-size: 8px 8px;
}

/* Flying pour block — transform only; no filter/box-shadow on the moving layer */
.ws-flight {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 40;
  pointer-events: none;
  will-change: transform;
}

.ws-flight.is-moving {
  transition: transform 0.32s ease-in-out;
}

.ws-flight-block {
  width: 100%;
  height: 100%;
  border-radius: 1px;
  overflow: hidden;
}

/* Reserved status row — always present so the board does not shift. */
.ws-stuck-slot {
  display: flex;
  align-items: stretch;
  justify-content: center;
  min-height: 3.35rem;
  margin: 0.35rem 0 0.15rem;
}

.ws-stuck {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  align-items: baseline;
  justify-content: center;
  box-sizing: border-box;
  width: 100%;
  min-height: 3.35rem;
  padding: 0.55rem 0.85rem;
  border: 1px solid color-mix(in srgb, var(--danger, #a33) 45%, var(--border, #c5ccd6));
  border-radius: 8px;
  background: color-mix(in srgb, var(--danger, #a33) 8%, var(--bg-elevated, #fff));
  color: var(--text, #1d2433);
  font-size: 0.95rem;
}

.ws-stuck strong {
  font-weight: 700;
}

.ws-picker-banner .ws-picker-card {
  text-align: left;
  /* Fixed width so Chapters and Levels views don’t jump size. */
  width: min(28rem, 94vw);
  max-width: min(28rem, 94vw);
  box-sizing: border-box;
  max-height: min(90vh, 36rem);
  overflow: auto;
  padding: 1.15rem 1.35rem 1.35rem;
}

.ws-picker-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
}

.ws-picker-card-head h3 {
  margin: 0;
}

.ws-picker-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.ws-chapters,
.ws-levels {
  margin-top: 0.15rem;
  width: 100%;
  max-width: 100%;
}

.ws-chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(7.5rem, 1fr));
  gap: 0.5rem;
}

.ws-chapter-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  min-height: var(--tap-min);
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border, #c5ccd6);
  border-radius: 8px;
  background: var(--bg-elevated, #fff);
  color: var(--text, #1d2433);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.ws-chapter-card:hover:not(:disabled) {
  border-color: var(--gold);
}

.ws-chapter-card.is-current {
  border-color: var(--gold);
  background: color-mix(in srgb, var(--gold) 12%, transparent);
}

.ws-chapter-card.is-locked,
.ws-chapter-card:disabled {
  opacity: 0.45;
  cursor: default;
}

.ws-chapter-title {
  font-weight: 600;
  font-size: 0.92rem;
}

.ws-chapter-range {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.ws-chapter-progress {
  font-size: 0.85rem;
  font-weight: 600;
}

.ws-levels-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.5rem;
}

.ws-level-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(var(--tap-min), 1fr));
  gap: 0.4rem;
}

.ws-level-btn {
  min-width: var(--tap-min);
  min-height: var(--tap-min);
  padding: 0.3rem;
  border: 1px solid var(--border, #c5ccd6);
  border-radius: 6px;
  background: var(--bg-elevated, #fff);
  color: var(--text, #1d2433);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}

.ws-level-btn:hover:not(:disabled) {
  border-color: var(--gold);
}

.ws-level-btn.is-current {
  border-color: var(--gold);
  background: color-mix(in srgb, var(--gold) 14%, transparent);
  font-weight: 700;
}

.ws-level-btn.is-cleared:not(.is-current) {
  border-color: color-mix(in srgb, var(--success) 50%, var(--border, #c5ccd6));
}

.ws-level-btn:disabled {
  opacity: 0.4;
  cursor: default;
}

@media (max-width: 640px) {
  .ws-board-wrap {
    --ws-per-row: 6;
    --ws-col-gap: 0.45rem;
    --ws-row-gap: 0.75rem;
  }

  .ws-chapter-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .ws-level-grid {
    grid-template-columns: repeat(5, minmax(2.5rem, 1fr));
  }

  .ws-picker-banner .ws-picker-card {
    padding: 1rem;
  }
}

[data-theme='dark'] .ws-tube {
  border-color: #8a94a0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent 28%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06), transparent 18%, transparent 82%, rgba(0, 0, 0, 0.2)),
    #2a323c;
}

[data-theme='dark'] .ws-tube::before {
  border-color: #8a94a0;
  background: #323a44;
}

[data-theme='dark'] .ws-chapter-card,
[data-theme='dark'] .ws-level-btn {
  background: #2a323c;
  border-color: #4a5563;
  color: #e8ecef;
}

[data-theme='dark'] .ws-stuck {
  background: color-mix(in srgb, var(--danger, #c55) 14%, #2a323c);
}

@media (prefers-reduced-motion: reduce) {
  .ws-flight.is-moving {
    transition: none;
  }
}