/* Grid puzzle tool base (shared look of the grid-puzzle pages; each page carries its own copy). The board is paper:
   it keeps fixed black-on-white colors in both themes, like the puzzle on a printed page. */
.gp { --gp-ink: #111; --gp-paper: #fff; --gp-line: #9a9a9a; --gp-thin: #cfcfcf; --gp-hi: #e6dcfb; --gp-hi2: #f4ecd6;
  --gp-sel: #6d4aff; --gp-sol: #5b5b5b; --gp-bad: #f7c9c4; --gp-diff: #ffe08a; }
.gp-bar { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: flex-end; margin-bottom: 14px; }
.gp-bar .field { flex: 0 0 auto; }
.gp-bar select, .gp-bar input[type=number] { width: auto; min-height: 40px; padding: 6px 12px; }
.gp-bar select { padding-right: 34px; }
.gp-bar input[type=number] { width: 84px; }
.gp-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; padding: 4px; margin: 0 -4px; }
.gp-board { position: relative; margin: 0 auto; background: var(--gp-paper); color: var(--gp-ink); user-select: none; -webkit-user-select: none; touch-action: manipulation; }
.gp-board:focus { outline: none; }
.gp-board:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.gp-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.gp-actions + .gp-actions { margin-top: 8px; }
.gp-more { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 12px; }
.gp-pad { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 6px; margin: 14px auto 0; max-width: 420px; }
.gp-pad button { font: inherit; font-size: 18px; font-weight: 500; min-height: 44px; border-radius: var(--r-md); border: 1px solid var(--line); background: var(--canvas); color: var(--ink); cursor: pointer; }
.gp-pad button:hover { border-color: var(--ink); }
.gp-pad button.wide { grid-column: span 2; font-size: 15px; }
.gp-note { font-size: 14px; color: var(--muted); margin: 10px 0 0; }
.gp-explain { background: var(--canvas); border: 1px solid var(--line); border-radius: var(--r-md); padding: 12px 14px; margin-top: 12px; font-size: 15px; }
.gp-explain b { color: var(--ink); }
.gp-steps { margin: 12px 0 0; padding-left: 22px; font-size: 15px; max-height: 320px; overflow-y: auto; }
.gp-steps li { margin: 4px 0; }
.gp-steps li.cur { font-weight: 600; color: var(--ink); }
.gp-io textarea { font-family: var(--mono); font-size: 14px; }
.gp-sel-panel { margin-top: 12px; }
.gp-side .btn { flex: 1 1 auto; }
@media (max-width: 420px) { .gp-side .btn { padding-left: 14px; padding-right: 14px; } }
/* Star battle board: region colors are part of the puzzle */
.sb-grid { display: grid; grid-template-columns: repeat(var(--n), minmax(0, 1fr)); width: 100%; max-width: calc(var(--n) * 56px); --cs: 44px; touch-action: none; }
.sb-c { aspect-ratio: 1; background: var(--c, #fff); border-right: 1px solid rgba(0,0,0,.12); border-bottom: 1px solid rgba(0,0,0,.12); display: flex; align-items: center; justify-content: center; cursor: pointer; position: relative; }
.sb-c.free { background: repeating-linear-gradient(45deg, #fff, #fff 5px, #f1f1ef 5px, #f1f1ef 10px); }
.sb-c.bt { border-top: 3px solid var(--gp-ink); }
.sb-c.bl { border-left: 3px solid var(--gp-ink); }
.sb-c.bb { border-bottom: 3px solid var(--gp-ink); }
.sb-c.br { border-right: 3px solid var(--gp-ink); }
.sb-c.sel { box-shadow: inset 0 0 0 3px var(--gp-sel); }
.sb-c.hi::after { content: ""; position: absolute; inset: 3px; border: 2px dashed var(--gp-sel); border-radius: 4px; pointer-events: none; }
.sb-c.diff { box-shadow: inset 0 0 0 4px #c79100; }
.sb-l { font: 500 calc(var(--cs) * .28) var(--mono); color: rgba(0,0,0,.35); pointer-events: none; }
.sb-star { font-size: calc(var(--cs) * .62); line-height: 1; color: #111; pointer-events: none; }
.sb-dot { width: 6px; height: 6px; border-radius: 50%; background: rgba(0,0,0,.35); pointer-events: none; }
.sb-pal .sb-chip { background: var(--c); color: #111; border-color: rgba(0,0,0,.15); min-width: 40px; min-height: 40px; font-family: var(--mono); }
.sb-pal .sb-chip[aria-pressed="true"] { box-shadow: 0 0 0 3px var(--ink); border-color: var(--ink); background: var(--c); color: #111; }