:root {
  --board-size: min(88vw, 570px);
  --board-pad: clamp(18px, 4vw, 34px);
  --point-step: calc((var(--board-size) - (var(--board-pad) * 2)) / 14);
  --hit-size: min(36px, calc(var(--point-step) * 1.14));
  --wood: #d9a55f;
  --wood-dark: #7b4d24;
  --ink: #1e1914;
  --paper: #faf8f2;
  --line: rgba(65, 40, 18, 0.42);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, sans-serif;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(90, 123, 102, 0.16), transparent 42%),
    #f2eee6;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 24px 14px 40px;
}

.container {
  width: min(100%, 720px);
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin: 0 auto 16px;
}

h1 {
  margin: 0;
  font-size: clamp(28px, 5vw, 42px);
  line-height: 1.1;
}

.subtitle {
  margin: 8px 0 0;
  color: #655747;
  font-size: 15px;
}

.score-card {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 132px;
  justify-content: flex-end;
  font-weight: 700;
}

.turn-badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid #29231d;
  border-radius: 999px;
}

.black-turn {
  color: #fff;
  background: #171513;
}

.white-turn {
  color: #171513;
  background: #fff;
}

.timer-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 58px;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid #9b8062;
  border-radius: 999px;
  background: #fff8ec;
  color: #3c2d1f;
}

.timer-badge.urgent {
  border-color: #b72a2a;
  color: #fff;
  background: #b72a2a;
}

#status {
  min-height: 28px;
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 700;
  text-align: center;
}

.game-options {
  width: var(--board-size);
  margin: 0 auto 14px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.game-options label {
  display: grid;
  gap: 6px;
  color: #5c5146;
  font-size: 14px;
  font-weight: 700;
}

.game-options select {
  min-height: 40px;
  border: 1px solid #8f7a62;
  border-radius: 6px;
  padding: 0 10px;
  background: rgba(255, 255, 255, 0.8);
  color: var(--ink);
  font: inherit;
}

.game-options label[hidden],
.start-panel[hidden] {
  display: none;
}

.start-panel {
  width: var(--board-size);
  margin: 0 auto 16px;
  padding: 14px 16px;
  border: 1px solid #d9c8ad;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.68);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.start-panel p {
  margin: 0;
  color: #4f4337;
  font-weight: 700;
  line-height: 1.45;
}

.start-panel button {
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid #33271d;
  border-radius: 6px;
  color: #fff;
  background: #2f261e;
  cursor: pointer;
  font-weight: 800;
  white-space: nowrap;
}

.start-panel button:hover,
.start-panel button:focus-visible {
  background: #4a3929;
}

.board-wrap {
  width: var(--board-size);
  margin: 0 auto;
  position: relative;
}

.board {
  width: var(--board-size);
  height: var(--board-size);
  border: 5px solid var(--wood-dark);
  background: var(--wood);
  box-shadow: 0 18px 34px rgba(40, 28, 16, 0.22);
  position: relative;
  touch-action: manipulation;
}

.board::before {
  content: "";
  position: absolute;
  left: var(--board-pad);
  top: var(--board-pad);
  width: calc(var(--point-step) * 14);
  height: calc(var(--point-step) * 14);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background-image:
    repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px var(--point-step)),
    repeating-linear-gradient(to bottom, var(--line) 0 1px, transparent 1px var(--point-step));
  pointer-events: none;
}

.star-point {
  position: absolute;
  left: calc(var(--board-pad) + (var(--x) * var(--point-step)));
  top: calc(var(--board-pad) + (var(--y) * var(--point-step)));
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(62, 36, 14, 0.72);
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.cell {
  position: absolute;
  left: calc(var(--board-pad) + (var(--x) * var(--point-step)) - (var(--hit-size) / 2));
  top: calc(var(--board-pad) + (var(--y) * var(--point-step)) - (var(--hit-size) / 2));
  width: var(--hit-size);
  height: var(--hit-size);
  border: 0;
  border-radius: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  background: transparent;
  z-index: 2;
}

.cell::before {
  content: "";
  width: 22%;
  height: 22%;
  border-radius: 50%;
  background: rgba(78, 45, 17, 0);
  transition: background 120ms ease;
}

.cell:hover::before,
.cell:focus-visible::before {
  background: rgba(78, 45, 17, 0.28);
}

.cell:disabled {
  cursor: default;
}

.cell:disabled::before {
  display: none;
}

.cell.blocked {
  animation: shake 180ms ease-in-out 2;
  background: rgba(176, 39, 39, 0.22);
}

.cell.forbidden::before {
  width: 32%;
  height: 32%;
  border: 2px solid rgba(183, 42, 42, 0.76);
  background: rgba(183, 42, 42, 0.1);
}

.stone {
  width: 76%;
  height: 76%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset -4px -5px 8px rgba(0, 0, 0, 0.22), 0 2px 4px rgba(0, 0, 0, 0.24);
}

.black {
  background: radial-gradient(circle at 32% 28%, #555, #111 52%, #030303);
}

.white {
  border: 1px solid #bdb8ad;
  background: radial-gradient(circle at 30% 26%, #fff, #ece8dd 58%, #cfc8bb);
}

.last-move::after {
  content: "";
  position: absolute;
  right: 21%;
  top: 21%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d33f2f;
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.72);
}

.buttons {
  margin-top: 12px;
  text-align: center;
}

button {
  font: inherit;
}

.toolbar {
  width: var(--board-size);
  margin: 16px auto 0;
  display: flex;
  justify-content: center;
}

#resetBtn,
.toolbar button {
  min-height: 40px;
  padding: 0 18px;
  border: 1px solid #33271d;
  border-radius: 6px;
  color: #fff;
  background: #2f261e;
  cursor: pointer;
}

.toolbar button {
  min-width: min(100%, 180px);
}

#resetBtn:hover,
.toolbar button:hover,
#resetBtn:focus-visible,
.toolbar button:focus-visible {
  background: #4a3929;
}

.toolbar button:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

.game-over-banner {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: grid;
  place-content: center;
  gap: 18px;
  text-align: center;
  background: rgba(26, 20, 15, 0.42);
  backdrop-filter: blur(2px);
}

.game-over-banner[hidden] {
  display: none;
}

.game-over-banner strong {
  display: block;
  min-width: min(78vw, 360px);
  padding: 22px 24px;
  border-radius: 8px;
  font-size: clamp(30px, 7vw, 56px);
  line-height: 1.1;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.32);
}

.game-over-banner.black-win strong {
  color: #fff;
  background: #161412;
}

.game-over-banner.white-win strong {
  color: #171513;
  background: #fffaf0;
}

.game-over-banner.draw strong {
  color: #fff;
  background: #5f645d;
}

.game-over-banner button {
  justify-self: center;
  min-height: 44px;
  padding: 0 22px;
  border: 1px solid #f7efe4;
  border-radius: 6px;
  color: #1f1914;
  background: #f7efe4;
  cursor: pointer;
  font-weight: 800;
}

.panel {
  width: var(--board-size);
  margin: 18px auto 0;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.62);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.panel h2 {
  margin: 0;
  font-size: 17px;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #5c5146;
  font-size: 14px;
  white-space: nowrap;
}

.move-log {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(92px, 1fr));
  gap: 6px 12px;
  max-height: 132px;
  overflow: auto;
  margin: 12px 0 0;
  padding-left: 22px;
  text-align: left;
  color: #3d342b;
  font-size: 14px;
}

.empty-log {
  color: #75695d;
  grid-column: 1 / -1;
  list-style: none;
  margin-left: -22px;
}

.rules {
  width: var(--board-size);
  margin: 18px auto 0;
  padding: 14px 16px;
  border-left: 4px solid #5f7d63;
  background: rgba(255, 255, 255, 0.62);
}

.rules h2 {
  margin: 0 0 6px;
  font-size: 17px;
}

.rules p {
  margin: 0;
  color: #5c5146;
  line-height: 1.55;
}

.forbidden-figure {
  margin: 14px 0 0;
}

.forbidden-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid #d9c8ad;
  border-radius: 8px;
  background: #f8f3e8;
}

.forbidden-figure figcaption {
  margin-top: 8px;
  color: #6a5c4c;
  font-size: 14px;
  line-height: 1.45;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }

  50% {
    transform: translateX(4px);
  }
}

@media (max-width: 560px) {
  :root {
    --board-size: min(94vw, 570px);
  }

  .game-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .score-card {
    justify-content: flex-start;
  }

  .game-options {
    grid-template-columns: 1fr;
  }

  .start-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .toolbar {
    display: flex;
  }
}