:root {
  --bg-a: #f6f2de;
  --bg-b: #d6e7d8;
  --ink: #1a2a20;
  --panel: rgba(255, 255, 255, 0.84);
  --board-dark: #0f4f2d;
  --board-mid: #166534;
  --board-line: #08371d;
  --accent: #c2410c;
  --hint: rgba(252, 211, 77, 0.88);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Avenir Next', 'Gill Sans', 'Trebuchet MS', sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 20%, rgba(255, 255, 255, 0.7), transparent 44%),
    radial-gradient(circle at 88% 78%, rgba(255, 255, 255, 0.5), transparent 38%),
    linear-gradient(140deg, var(--bg-a), var(--bg-b));
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.help-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.help-links a {
  color: var(--board-line);
  text-decoration: none;
  font-weight: 700;
  border-bottom: 2px solid transparent;
}

.help-links a:hover,
.help-links a:focus-visible {
  border-bottom-color: var(--accent);
}

.controls {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: flex-end;
  background: var(--panel);
  padding: 14px;
  border-radius: 16px;
  backdrop-filter: blur(4px);
}

.control-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

label {
  font-weight: 700;
}

select,
button {
  font: inherit;
}

select {
  min-width: 160px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid rgba(0, 0, 0, 0.2);
  background: #fff;
}

button {
  padding: 9px 15px;
  border-radius: 10px;
  border: 0;
  background: linear-gradient(135deg, #166534, #14532d);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s ease, filter 0.12s ease;
}

button:hover,
button:focus-visible {
  transform: translateY(-1px);
  filter: brightness(1.06);
}

button:active {
  transform: translateY(0);
}

.game-layout {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 340px);
  align-items: start;
}

.board-panel {
  background: var(--panel);
  border-radius: 18px;
  padding: 16px;
  box-shadow: 0 14px 40px rgba(10, 40, 20, 0.18);
}

.side-column {
  display: grid;
  gap: 12px;
  align-content: start;
}

.board {
  width: min(100%, 640px);
  aspect-ratio: 1;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  gap: 2px;
  padding: 10px;
  border-radius: 14px;
  background: var(--board-line);
}

.cell {
  position: relative;
  border: 0;
  border-radius: 8px;
  background: linear-gradient(150deg, var(--board-mid), var(--board-dark));
  cursor: pointer;
  transition: filter 0.12s ease;
}

.cell:hover,
.cell:focus-visible {
  filter: brightness(1.08);
}

.cell:disabled {
  cursor: default;
  filter: none;
}

.cell::after {
  content: '';
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  transform: scale(0);
  transition: transform 0.16s ease;
}

.cell.black::after {
  background: radial-gradient(circle at 30% 28%, #4b5563, #111827 60%);
  transform: scale(1);
}

.cell.white::after {
  background: radial-gradient(circle at 30% 28%, #ffffff, #d1d5db 62%);
  box-shadow: inset 0 -1px 3px rgba(0, 0, 0, 0.18);
  transform: scale(1);
}

.cell.hint::before {
  content: '';
  position: absolute;
  width: 18%;
  height: 18%;
  border-radius: 50%;
  left: 41%;
  top: 41%;
  background: var(--hint);
}

.info-panel {
  display: grid;
  gap: 10px;
}

.stat-card {
  background: var(--panel);
  border-radius: 14px;
  padding: 10px 12px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
}

.stat-card span {
  font-weight: 600;
  opacity: 0.88;
}

.stat-card strong {
  font-size: 1.05rem;
}

.status-line {
  margin: 0;
  background: rgba(255, 255, 255, 0.9);
  border-left: 6px solid var(--accent);
  padding: 12px;
  border-radius: 10px;
  min-height: 52px;
  display: flex;
  align-items: center;
  font-weight: 600;
}

@media (max-width: 920px) {
  .game-layout {
    grid-template-columns: 1fr;
  }

  .board {
    width: min(100%, 560px);
  }

  .info-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 580px) {
  .app-shell {
    padding: 14px;
  }

  .info-panel {
    grid-template-columns: 1fr;
  }

  .status-line {
    font-size: 0.95rem;
  }
}