:root {
  --bg: #F7F3EE;
  --text-primary: #2C2926;
  --text-muted: #A89F94;
  --frame-line: #DDD5D0;
  --accent: #5E8DA2;
  --start-finish: #E8E4E0;
}

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

body {
  min-height: 100vh;
  font-family: Georgia, "Times New Roman", serif;
  background-color: var(--bg);
  color: var(--text-primary);
  font-size: 16px;
}

main {
  max-width: 560px;
  margin: 0 auto;
  padding: 1.5rem;
  padding-bottom: 14rem;
}

.tile-rack {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg);
  border-top: 1px solid var(--frame-line);
  padding: 0.75rem 1.5rem 1rem;
  max-width: 560px;
  margin: 0 auto;
  box-sizing: border-box;
  text-align: center;
}

.tile-rack .controls {
  margin-bottom: 0.5rem;
}

.tile-rack .controls-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tile-rack .controls-row .action-btn:first-child {
  flex-shrink: 0;
}

.tile-rack .controls-spacer {
  flex: 1;
  min-width: 0;
}

.tile-rack .controls-center {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow: visible;
}

.tile-rack .controls-row .direction-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: -1.2rem;
}

.tile-rack .controls-row .replace-btn {
  flex-shrink: 0;
}

.tile-rack .message {
  min-height: 1.25rem;
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

h1 {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.top-nav {
  margin-bottom: 0.75rem;
}

.back-btn {
  font-family: inherit;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
}

.back-btn:hover {
  color: var(--accent);
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.game-header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.restart-btn,
.rules-btn {
  padding: 0.25rem 0.5rem;
  font-family: inherit;
  font-size: 0.8rem;
  background: transparent;
  border: 1px solid var(--frame-line);
  color: var(--text-muted);
  cursor: pointer;
}

.restart-btn:hover,
.rules-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.rules-dialog {
  margin: 0;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 360px;
  padding: 1.25rem;
  border: 1px solid var(--frame-line);
  background: var(--bg);
  color: var(--text-primary);
  font-family: inherit;
}

.rules-dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
}

.rules-dialog h2 {
  font-size: 1.25rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.rules-list {
  margin: 0 0 1rem 1.25rem;
  padding: 0;
}

.rules-list li {
  margin-bottom: 0.35rem;
}

.dialog-close {
  padding: 0.25rem 0.5rem;
  font-family: inherit;
  font-size: 0.8rem;
  background: transparent;
  border: 1px solid var(--frame-line);
  color: var(--text-muted);
  cursor: pointer;
}

.dialog-close:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.board-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 1.5rem;
}

.board-label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: 0.85;
}

.board-label--start {
  margin-bottom: 0.35rem;
}

.board-label--end {
  margin-top: 0.35rem;
}

.board {
  display: grid;
  gap: 0;
  border: 1px solid var(--frame-line);
  background: var(--bg);
}

.cell {
  width: 1.75rem;
  height: 1.75rem;
  min-width: 1.75rem;
  min-height: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  border: 1px solid var(--frame-line);
  background: var(--bg);
  color: var(--text-primary);
  cursor: pointer;
}

.cell.start,
.cell.finish {
  background: var(--start-finish);
}

.cell.selected {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
  z-index: 1;
}

.cell.filled {
  background: rgba(94, 141, 162, 0.15);
  color: var(--accent);
}

.cell.preview {
  color: var(--accent);
  opacity: 0.75;
  background: rgba(94, 141, 162, 0.12);
  border-style: dashed;
}

.cell.next-slot {
  background: rgba(94, 141, 162, 0.35);
  border: 1px dashed rgba(94, 141, 162, 0.8);
  box-shadow: inset 0 0 0 1px rgba(94, 141, 162, 0.25);
}

.cell:hover:not(.start):not(.finish) {
  background: rgba(221, 213, 208, 0.6);
}

.dir-btn {
  padding: 0.35rem 0.6rem;
  font-family: inherit;
  font-size: 0.9rem;
  background: transparent;
  border: 1px solid var(--frame-line);
  color: var(--text-primary);
  cursor: pointer;
}

.dir-btn[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent);
}

.dir-btn:hover {
  border-color: var(--accent);
}

.action-btn {
  padding: 0.4rem 0.75rem;
  font-family: inherit;
  font-size: 0.95rem;
  background: transparent;
  border: 1px solid var(--frame-line);
  color: var(--text-primary);
  cursor: pointer;
}

.action-btn:hover,
.tile-rack .replace-btn:not(:disabled):hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tile-rack .replace-btn {
  padding: 0.4rem 0.75rem;
  font-family: inherit;
  font-size: 0.85rem;
  background: transparent;
  border: 1px solid var(--frame-line);
  color: var(--text-muted);
  cursor: pointer;
}

.tile-rack .replace-btn:disabled {
  opacity: 0.6;
  cursor: default;
}

.tile-rack .replace-btn .replace-count {
  margin-left: 0.2em;
  font-size: 0.95em;
  opacity: 0.9;
}

.tile-rack.replace-mode .tile {
  border-style: dashed;
}

.hand-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.hand {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.tile {
  width: 2.25rem;
  height: 2.25rem;
  min-width: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 600;
  border: 1px solid var(--frame-line);
  background: rgba(94, 141, 162, 0.08);
  color: var(--text-primary);
  cursor: pointer;
}

.tile:hover {
  border-color: var(--accent);
  background: rgba(94, 141, 162, 0.15);
}

.tile.selected {
  border-color: var(--accent);
  background: rgba(94, 141, 162, 0.2);
  color: var(--accent);
}

.tile.plank {
  font-size: 0.85rem;
}

@media (min-width: 768px) {
  .cell {
    width: 2rem;
    height: 2rem;
    min-width: 2rem;
    min-height: 2rem;
    font-size: 1.1rem;
  }

  .tile {
    width: 2.5rem;
    height: 2.5rem;
    min-width: 2.5rem;
    font-size: 1.2rem;
  }
}