:root {
  --bg: #1e2a24;
  --panel: #27362f;
  --text: #eef3ef;
  --muted: #a9b8af;
  --board: #1f7a4a;
  --board-edge: #145535;
  --grid: #0f4a2c;
  --accent: #f2c14e;
  --hint: rgba(255, 255, 255, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex;
  justify-content: center;
}

.app {
  width: 100%;
  max-width: 560px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

h1 {
  margin: 8px 0 0;
  letter-spacing: 0.08em;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  justify-content: center;
  align-items: center;
  font-size: 0.9rem;
}

.controls label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}

.controls label[hidden] {
  display: none;
}

select,
button {
  font: inherit;
  color: var(--text);
  background: var(--panel);
  border: 1px solid #3d5046;
  border-radius: 6px;
  padding: 6px 10px;
}

button {
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
}

button:disabled {
  opacity: 0.45;
  cursor: default;
}

.panel {
  width: 100%;
  background: var(--panel);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.9rem;
}

.panel[hidden],
.panel [hidden] {
  display: none;
}

.panel p {
  margin: 4px 0 8px;
}

.panel-status.error {
  color: #ff9b8a;
}

.panel-actions {
  display: flex;
  gap: 8px;
}

.panel-actions:not(:has(button:not([hidden]))) {
  display: none;
}

.panel-actions button {
  margin-bottom: 8px;
}

.resume-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.resume-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.resume-list span {
  flex: 1;
  color: var(--muted);
}

.share-row {
  display: flex;
  gap: 8px;
}

.share-row input {
  flex: 1;
  min-width: 0;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid #3d5046;
  border-radius: 6px;
  padding: 6px 8px;
}

.scoreboard {
  display: flex;
  gap: 12px;
  width: 100%;
}

.score {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--panel);
  border: 2px solid transparent;
  border-radius: 10px;
  transition: border-color 0.2s;
}

.score.active {
  border-color: var(--accent);
}

.score .name {
  flex: 1;
}

.score .count {
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.disc-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
}

.score.black .disc-icon {
  background: #111;
  box-shadow: inset 0 0 0 1px #555;
}

.score.white .disc-icon {
  background: #f5f5f5;
}

.status {
  margin: 0;
  min-height: 1.4em;
  text-align: center;
}

.board {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  gap: 2px;
  padding: 6px;
  background: var(--grid);
  border: 6px solid var(--board-edge);
  border-radius: 8px;
}

.cell {
  position: relative;
  padding: 0;
  border: none;
  border-radius: 0;
  background: var(--board);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: default;
}

.cell.valid {
  cursor: pointer;
}

.cell.valid:hover {
  background: #26905a;
}

.cell.hint::after {
  content: "";
  width: 26%;
  height: 26%;
  border-radius: 50%;
  background: var(--hint);
}

.cell.last::before {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 0 2px var(--accent);
  pointer-events: none;
}

.disc {
  width: 82%;
  height: 82%;
  border-radius: 50%;
  box-shadow: 0 2px 3px rgba(0, 0, 0, 0.45);
}

.disc.black {
  background: radial-gradient(circle at 35% 30%, #4a4a4a, #0c0c0c 70%);
}

.disc.white {
  background: radial-gradient(circle at 35% 30%, #ffffff, #cfcfcf 75%);
}

.disc.flip {
  animation: flip 0.35s ease;
}

@keyframes flip {
  0% { transform: scaleX(1); }
  50% { transform: scaleX(0); }
  100% { transform: scaleX(1); }
}

.rules {
  width: 100%;
  background: var(--panel);
  border-radius: 10px;
  padding: 10px 14px;
  color: var(--muted);
  font-size: 0.9rem;
}

.rules summary {
  cursor: pointer;
  color: var(--text);
}

.rules ul {
  padding-left: 20px;
  margin-bottom: 4px;
}

@media (prefers-reduced-motion: reduce) {
  .disc.flip {
    animation: none;
  }
}