/* ---------- Crossplay Solver — Phase 1 styles ---------- */
:root {
  --bg: #0e1a2b;
  --panel: #152840;
  --text: #eaf1fb;
  --muted: #95a7c2;
  --accent: #4e9ef2;
  --accent-dim: #2d5a8f;
  --tile-bg: #f1efe6;
  --tile-text: #1a1a1a;
  --tile-blank: #3a6fa0;
  --tile-new: #f7c948;      /* preview color for newly placed tiles */
  --tile-new-text: #1a1a1a;
  --cell-empty: #f7f5ee;
  --cell-border: #c3bfb1;
  --bonus-3l: #7ab864;
  --bonus-2l: #dbc78c;
  --bonus-3w: #b284c4;
  --bonus-2w: #9aafd4;
  --center-star: #0e1a2b;
  --danger: #d05858;
}

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

/* Hidden input that captures keystrokes.
   iOS Safari (13+) refuses to programmatically focus inputs that are off-screen,
   display:none, or pointer-events:none — so we keep this 1x1 in the viewport at
   the top-left corner. The 16px font-size prevents iOS auto-zoom on focus.
   caret-color:transparent hides the cursor flicker. */
#hidden-input {
  position: fixed;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
  opacity: 0;
  border: 0;
  padding: 0;
  margin: 0;
  font-size: 16px;
  background: transparent;
  caret-color: transparent;
  -webkit-appearance: none;
  appearance: none;
}

kbd {
  display: inline-block;
  padding: 1px 5px;
  font: inherit;
  font-size: 0.85em;
  background: var(--accent-dim);
  border-radius: 3px;
  color: var(--text);
}
.arrow { color: var(--accent); font-weight: 700; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--accent-dim);
}
h1 { margin: 0; font-size: 1.15rem; font-weight: 600; }
.status { font-size: 0.85rem; color: var(--muted); }

main {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem;
  max-width: 640px;
  margin: 0 auto;
}

.section-label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.help {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ---------- Board ---------- */
.board-wrap { }
.board {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  gap: 2px;
  background: var(--accent-dim);
  padding: 2px;
  border-radius: 6px;
  aspect-ratio: 1;
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  user-select: none;
}
.cell {
  position: relative;
  background: var(--cell-empty);
  color: var(--tile-text);
  font-weight: 700;
  font-size: clamp(8px, 2vw, 16px);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 3px;
  outline: none;
}
.cell.bonus-3L { background: var(--bonus-3l); }
.cell.bonus-2L { background: var(--bonus-2l); }
.cell.bonus-3W { background: var(--bonus-3w); }
.cell.bonus-2W { background: var(--bonus-2w); }

.cell.filled {
  background: var(--tile-bg);
}
.cell.filled.blank {
  color: var(--tile-blank);
}
.cell.preview {
  background: var(--tile-new);
  color: var(--tile-new-text);
  box-shadow: 0 0 0 2px #b88a0c inset;
}
.cell.preview.blank {
  color: #b88a0c;
  font-style: italic;
}

.cell.selected {
  box-shadow: 0 0 0 2px var(--accent) inset;
  z-index: 2;
}
/* Typing-direction arrow on the selected cell. */
.cell.selected::before {
  position: absolute;
  bottom: 0px;
  right: 2px;
  font-size: clamp(8px, 1.6vw, 13px);
  line-height: 1;
  font-weight: 700;
  color: var(--accent);
  pointer-events: none;
  z-index: 3;
}
.cell.selected.dir-h::before { content: "→"; }
.cell.selected.dir-v::before { content: "↓"; }
.cell.center::after {
  content: "★";
  position: absolute;
  color: var(--center-star);
  opacity: 0.35;
  font-size: 140%;
  pointer-events: none;
}
.cell.filled::after, .cell.preview::after { display: none; }

.cell .bonus-tag {
  position: absolute;
  top: 2px;
  left: 2px;
  font-size: 0.55em;
  font-weight: 700;
  color: rgba(0,0,0,0.7);
  line-height: 1;
  pointer-events: none;
}
.cell.filled .bonus-tag, .cell.preview .bonus-tag { display: none; }

/* ---------- Rack ---------- */
.rack {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  max-width: 420px;
  margin: 0 auto;
}
.rack-slot {
  aspect-ratio: 1;
  border-radius: 6px;
  background: var(--panel);
  border: 2px dashed var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: clamp(16px, 4.5vw, 26px);
  cursor: pointer;
  user-select: none;
}
.rack-slot.filled {
  background: var(--tile-bg);
  color: var(--tile-text);
  border-style: solid;
  border-color: #908a78;
}
.rack-slot.filled.blank { color: var(--tile-blank); }
.rack-slot.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent) inset;
}

/* ---------- Controls ---------- */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.controls button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--accent-dim);
  padding: 0.55rem 0.9rem;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
}
.controls button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #081423;
  font-weight: 600;
}
.controls button:disabled { opacity: 0.45; cursor: not-allowed; }
.controls button:hover:not(:disabled) { filter: brightness(1.1); }

/* ---------- Results ---------- */
.results {
  background: var(--panel);
  border-radius: 6px;
  overflow: hidden;
  max-height: 50vh;
  overflow-y: auto;
}
.result-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--accent-dim);
  cursor: pointer;
  font-size: 0.9rem;
}
.result-row-top, .result-row-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}
.result-row-bottom { min-height: 1.5rem; }
.result-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.3rem;
}
.result-actions {
  display: flex;
  gap: 0.35rem;
}
.result-actions button {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  padding: 0.2rem 0.55rem;
  font-size: 0.78rem;
  cursor: pointer;
  font-weight: 500;
}
.result-actions .btn-play {
  background: var(--accent);
  border-color: var(--accent);
  color: #081423;
  font-weight: 700;
}
.result-actions button:hover { filter: brightness(1.15); }
.result-row:last-child { border-bottom: none; }
.result-row:hover { background: #1c3457; }
.result-row.active {
  background: var(--accent-dim);
  font-weight: 600;
}
.result-word { font-family: "SF Mono", ui-monospace, Consolas, monospace; letter-spacing: 0.08em; }
.result-word .blank-letter { color: var(--tile-blank); }
.result-pos { color: var(--muted); font-size: 0.85em; margin-left: 0.4rem; }
.result-score { font-weight: 700; color: var(--accent); white-space: nowrap; }

/* Multiplier + bingo badges on each result row */
.badge {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: rgba(0,0,0,0.85);
  line-height: 1.4;
}
.badge.bonus-3L { background: var(--bonus-3l); }
.badge.bonus-2L { background: var(--bonus-2l); }
.badge.bonus-3W { background: var(--bonus-3w); color: #1a1a1a; }
.badge.bonus-2W { background: var(--bonus-2w); }
.badge.bingo {
  background: var(--tile-new);
  color: #1a1a1a;
  border-radius: 999px;
  padding: 1px 8px;
}

/* Hazard icon — flags plays that leave a bonus square reachable by opponent */
.hazard {
  display: inline-flex;
  align-items: center;
  font-size: 1rem;
  color: var(--danger);
  cursor: help;
  margin-left: 0.15rem;
}

.empty-hint {
  padding: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}