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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: #f5f7fa;
  color: #2c3e50;
  min-height: 100vh;
  padding-bottom: 60px;
}

.back-to-portfolio {
  position: fixed;
  top: 20px;
  left: 20px;
  background: white;
  color: #3498db;
  text-decoration: none;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 25px;
  font-size: 0.9em;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  z-index: 1000;
}

.back-to-portfolio:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

.page {
  max-width: 1000px;
  margin: 0 auto;
  padding: 90px 20px 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

.game-title {
  font-size: 2.4em;
  margin-bottom: 8px;
}

.game-subtitle {
  color: #7f8c8d;
  font-size: 1.1em;
}

.layout {
  display: flex;
  gap: 40px;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
}

.board-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

/* --- Board --- */

.board {
  display: grid;
  gap: 2px;
  background: #dfe4ea;
  padding: 2px;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

/* Cell size and grid dimensions per supported board size (set via the
   board's data-size attribute in JS). Keeping this in CSS — rather than
   inline styles — lets the mobile media query below cleanly override it. */
.board[data-size="6"] {
  --cell-size: 56px;
  grid-template-columns: repeat(7, var(--cell-size));
  grid-template-rows: repeat(7, var(--cell-size));
}

.board[data-size="8"] {
  --cell-size: 50px;
  grid-template-columns: repeat(9, var(--cell-size));
  grid-template-rows: repeat(9, var(--cell-size));
}

.board[data-size="10"] {
  --cell-size: 44px;
  grid-template-columns: repeat(11, var(--cell-size));
  grid-template-rows: repeat(11, var(--cell-size));
}

.board[data-size="12"] {
  --cell-size: 38px;
  grid-template-columns: repeat(13, var(--cell-size));
  grid-template-rows: repeat(13, var(--cell-size));
}

.clue-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eef1f5;
  color: #2c3e50;
  font-weight: 700;
  font-size: 1.1em;
  border-radius: 4px;
  transition: background 0.2s ease, color 0.2s ease;
}

.clue-cell.clue-error {
  background: #ffe0e0;
  color: #c0392b;
}

.game-cell {
  position: relative;
  background: white;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease;
}

.game-cell:hover {
  background: #f0f6ff;
}

.game-cell.fixed {
  cursor: default;
  background: #e8f8ee;
}

.game-cell.fixed:hover {
  background: #e8f8ee;
}

.game-cell.station {
  background: #e8f8ee;
}

.game-cell.cell-error {
  background: #ffe0e0 !important;
}

.game-cell svg {
  width: 100%;
  height: 100%;
}

.track-line {
  fill: none;
  stroke: #2c3e50;
  stroke-width: 6;
  stroke-linecap: round;
}

.station-marker {
  fill: #27ae60;
}

.x-mark {
  color: #b0b8c1;
  font-size: 1.6em;
  font-weight: 700;
}

/* --- Message banner --- */

.message {
  min-height: 1.4em;
  font-weight: 600;
  text-align: center;
  padding: 4px 10px;
}

.message-success {
  color: #27ae60;
}

.message-error {
  color: #c0392b;
}

.message-warn {
  color: #d68910;
}

/* --- Side panel --- */

.side-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 280px;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.size-label {
  font-size: 0.85em;
  font-weight: 600;
  color: #7f8c8d;
  margin-bottom: -4px;
}

.size-select {
  background: white;
  border: 2px solid #dfe4ea;
  color: #2c3e50;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
}

.size-select:hover {
  border-color: #3498db;
}

.btn {
  background: white;
  border: 2px solid #dfe4ea;
  color: #2c3e50;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:hover {
  border-color: #3498db;
  transform: translateY(-1px);
}

.btn-primary {
  background: #3498db;
  border-color: #3498db;
  color: white;
}

.btn-primary:hover {
  background: #2980b9;
  border-color: #2980b9;
}

.rules {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.rules h3 {
  margin-bottom: 10px;
}

.rules p {
  color: #7f8c8d;
  font-size: 0.92em;
  line-height: 1.6;
  margin-bottom: 6px;
}

/* --- Picker popup --- */

.picker-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.picker-panel {
  background: white;
  border-radius: 14px;
  padding: 24px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
  max-width: 320px;
  text-align: center;
}

.picker-panel h3 {
  margin-bottom: 16px;
  color: #2c3e50;
}

.picker-grid {
  display: grid;
  grid-template-columns: repeat(3, 64px);
  gap: 10px;
  justify-content: center;
}

.picker-btn {
  width: 64px;
  height: 64px;
  border: 2px solid #dfe4ea;
  border-radius: 10px;
  background: #f8f9fb;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  transition: all 0.15s ease;
}

.picker-btn:hover {
  border-color: #3498db;
  background: #eef6fd;
}

.picker-btn svg {
  width: 100%;
  height: 100%;
}

.picker-btn-text {
  font-size: 0.75em;
  font-weight: 600;
  color: #2c3e50;
  line-height: 1.2;
}

.picker-btn-x {
  color: #c0392b;
}

/* --- Responsive --- */

@media (max-width: 640px) {
  .board[data-size="6"] {
    --cell-size: 42px;
  }

  .board[data-size="8"] {
    --cell-size: 36px;
  }

  .board[data-size="10"] {
    --cell-size: 30px;
  }

  .board[data-size="12"] {
    --cell-size: 26px;
  }

  .layout {
    gap: 20px;
  }

  .board-wrap {
    max-width: 100%;
    overflow-x: auto;
  }

  .side-panel {
    width: 100%;
    max-width: 400px;
  }
}