:root {
  --bg: #12141c;
  --surface: #1b1e2a;
  --surface-2: #232838;
  --border: #2c3145;
  --ink: #eef0f6;
  --muted: #8991ab;
  --amber: #f4b942;
  --amber-dark: #c98f22;
  --teal: #46c2b0;
  --green: #4caf7d;
  --red: #e2585f;
}

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--ink);
  padding: 20px;
  margin: 0;

  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas:
    "header"
    "banner"
    "board"
    "clues"
    "controls";
  gap: 14px;
}

body > h3 {
  grid-area: header;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--amber);
  margin: 0;
  text-align: center;
}

/* ---- clue banner ---- */
#clueBanner {
  grid-area: banner;
  position: sticky;
  top: 20px;
  background: var(--amber);
  color: #201804;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 500;
  z-index: 100;
}
#clueBanner.empty {
  background: var(--surface-2);
  color: var(--muted);
}
#clueBanner .badge {
  font-weight: 700;
  margin-right: 8px;
  font-family: monospace;
}

/* ---- board ---- */
#board {
  grid-area: board;
  display: inline-grid;
  justify-self: center;
  row-gap: 3px;
  column-gap: 3px;
  background: var(--bg);
  border: none;
}

.cell {
  position: relative;
  width: 30px;
  height: 30px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-family: monospace;
  font-weight: 600;
  background: transparent;
  border: 1px solid transparent;
}

.cell.filled {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--ink);
  cursor: pointer;
}

.cell .num {
  position: absolute;
  top: 1px;
  left: 3px;
  font-size: 8px;
  color: var(--muted);
  pointer-events: none;
}

.cell.active-word {
  background: #33304a;
  border-color: var(--amber-dark);
}
.cell.active-cell {
  background: var(--amber);
  color: #201804;
  border-color: var(--amber);
}
.cell.active-cell .num, .cell.active-word .num {
  color: rgba(20,16,4,0.55);
}

.cell.correct {
  background: var(--green) !important;
  color: #0d2016 !important;
  border-color: var(--green) !important;
}
.cell.correct .num { color: rgba(13,32,22,0.6) !important; }

.cell.incorrect {
  background: var(--red) !important;
  color: #2b0a0c !important;
  border-color: var(--red) !important;
}
.cell.incorrect .num { color: rgba(43,10,12,0.6) !important; }

/* ---- clue lists ---- */
.clues {
  grid-area: clues;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.clues h4 {
  margin: 0 0 6px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.clue-item {
  padding: 6px 4px;
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.35;
  cursor: pointer;
  color: var(--ink);
}
.clue-item:hover, .clue-item.selected { background: var(--surface); }
.clue-item .n {
  font-weight: 700;
  margin-right: 6px;
  color: var(--amber);
  font-family: monospace;
}

/* ---- controls ---- */
.controls {
  grid-area: controls;
  display: flex;
  gap: 8px;
}
.controls button {
  flex: 1;
  padding: 12px 6px;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
}
#btnNew { background: var(--teal); color: #06231f; }
#btnCheck { background: var(--amber); color: #201804; }
#btnGiveup { background: transparent; color: var(--red); border: 1.5px solid var(--red); }

.hidden-input {
  position: fixed;
  top: 0;
  left: 0;
  opacity: 0;
  width: 1px;
  height: 1px;
  border: none;
  pointer-events: none;
}

/* ---- DESKTOP LAYOUT ---- */
@media (min-width: 900px) {
  body {
    grid-template-columns: 1fr 480px;
    grid-template-areas:
      "header header"
      "banner banner"
      "board  clues"
      "controls controls";
    align-items: start;
  }
  #board { justify-self: start; }
  .clues {
    grid-template-columns: 1fr 1fr;
    overflow-y: auto;
    padding-right: 4px;
  }
}

/* ---- MOBILE OPTIMIZATION ---- */
@media (max-width: 768px) {
  #acrossList, #downList {
    display: none !important;
  }

  #board {
    max-width: 100vw;
    overflow-x: auto;
    padding: 10px;
    touch-action: pan-x pan-y;
  }

  #clueBanner {
    position: sticky;
    top: 0;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  }
}