:root {
  color-scheme: light;
  --bg: #eef2ee;
  --ink: #202327;
  --muted: #686f77;
  --panel: #fbfcf8;
  --line: #c4cdc4;
  --light-square: #e8d6b9;
  --dark-square: #55675d;
  --dark-square-hover: #607468;
  --red: #b73535;
  --red-dark: #7f2020;
  --black: #1f242a;
  --black-soft: #353c45;
  --gold: #f3c75a;
  --focus: #184f68;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(120deg, rgba(45, 111, 143, 0.16), transparent 38%),
    linear-gradient(300deg, rgba(183, 53, 53, 0.12), transparent 44%),
    linear-gradient(180deg, #f9fbf7, var(--bg));
}

button {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 16px;
  color: var(--ink);
  background: #fffdf8;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: #9f8358;
  background: #fff5df;
}

button:disabled {
  opacity: 0.46;
  cursor: not-allowed;
}

button:focus-visible,
.square:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.game-shell {
  width: min(1180px, calc(100vw - 28px));
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(320px, 780px) minmax(260px, 330px);
  gap: 22px;
  align-items: center;
  padding: 24px 0;
}

.game-stage {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 250, 241, 0.86);
  box-shadow: 0 18px 44px rgba(42, 38, 31, 0.14);
}

.game-stage {
  display: grid;
  gap: 18px;
  padding: clamp(16px, 3vw, 28px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow,
.panel-label,
.score-label {
  display: block;
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 2px 0 0;
  font-size: clamp(1.45rem, 4vw, 2.4rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.board-wrap {
  width: min(100%, 690px);
  margin: 0 auto;
}

.board {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  width: 100%;
  aspect-ratio: 1;
  border: 8px solid #2a302c;
  border-radius: 8px;
  overflow: hidden;
  background: #2a302c;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.square {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 1;
  border: 0;
  border-radius: 0;
  padding: 0;
  background: var(--light-square);
}

.square.dark {
  background: var(--dark-square);
}

.square.dark:hover {
  background: var(--dark-square-hover);
}

.square.selected::after,
.square.legal::after,
.square.capture::after {
  content: "";
  position: absolute;
  inset: 9%;
  border-radius: 50%;
  pointer-events: none;
}

.square.selected::after {
  border: 4px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(243, 199, 90, 0.18);
}

.square.legal::after {
  inset: 33%;
  background: rgba(243, 199, 90, 0.78);
}

.square.capture::after {
  border: 4px solid var(--gold);
  background: rgba(183, 53, 53, 0.14);
}

.piece {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 72%;
  aspect-ratio: 1;
  border-radius: 50%;
  color: #fff8e8;
  font-weight: 900;
  font-size: clamp(1rem, 3.4vw, 1.9rem);
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.42);
  box-shadow:
    inset 0 8px 14px rgba(255, 255, 255, 0.22),
    inset 0 -12px 18px rgba(0, 0, 0, 0.25),
    0 9px 14px rgba(0, 0, 0, 0.24);
}

.piece.red {
  border: 3px solid #d96d5f;
  background: radial-gradient(circle at 35% 25%, #d9675d, var(--red) 48%, var(--red-dark));
}

.piece.black {
  border: 3px solid #5f6874;
  background: radial-gradient(circle at 35% 25%, #505965, var(--black-soft) 42%, var(--black));
}

.piece.king::before {
  content: "K";
  line-height: 1;
}

.file-labels {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  padding: 7px 8px 0;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 900;
  text-align: center;
}

.side-panel {
  display: grid;
  align-content: center;
  gap: 14px;
}

.score-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.score,
.turn-card,
.capture-card,
.moves-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.score {
  min-height: 88px;
  padding: 14px;
}

.score strong {
  display: block;
  margin-top: 8px;
  font-size: 2rem;
  line-height: 1;
}

.red-score {
  border-top: 5px solid var(--red);
}

.black-score {
  border-top: 5px solid var(--black-soft);
}

.turn-card {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 78px;
  padding: 14px;
}

.turn-card strong,
.capture-card strong {
  display: block;
  margin-top: 4px;
  font-size: 1.05rem;
}

.turn-dot {
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  border-radius: 50%;
  box-shadow: inset 0 5px 10px rgba(255, 255, 255, 0.24), inset 0 -8px 12px rgba(0, 0, 0, 0.28);
}

.turn-dot.red {
  background: var(--red);
}

.turn-dot.black {
  background: var(--black-soft);
}

.capture-card {
  min-height: 76px;
  padding: 14px;
}

.moves-panel {
  min-height: 210px;
  max-height: 300px;
  overflow: auto;
  padding: 14px;
}

.panel-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.move-history {
  display: grid;
  gap: 6px;
  margin: 0;
  padding-left: 24px;
  color: #3f454c;
  font-size: 0.92rem;
}

.move-history:empty::before {
  content: "No moves";
  display: block;
  margin-left: -24px;
  color: var(--muted);
  font-weight: 700;
}

@media (max-width: 920px) {
  .game-shell {
    grid-template-columns: 1fr;
    align-items: start;
    padding: 14px 0;
  }

  .side-panel {
    align-content: start;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .moves-panel {
    grid-column: 1 / -1;
    min-height: 150px;
  }
}

@media (max-width: 560px) {
  .game-shell {
    width: min(100vw - 14px, 100%);
    gap: 10px;
  }

  .game-stage,
  .side-panel {
    padding: 12px;
  }

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

  .actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  button {
    min-width: 0;
    padding: 0 10px;
  }

  .board {
    border-width: 5px;
  }

  .piece {
    width: 76%;
    border-width: 2px;
  }

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

  .moves-panel {
    grid-column: auto;
  }
}