:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #647084;
  --paper: #f7f3ea;
  --panel: #fffaf1;
  --line: #d9cbb9;
  --light: #eedfc5;
  --dark: #8e5d37;
  --accent: #1f7a8c;
  --accent-2: #d4663b;
  --legal: rgba(31, 122, 140, 0.32);
  --capture: rgba(212, 102, 59, 0.44);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(135deg, rgba(31, 122, 140, 0.12), transparent 36%),
    linear-gradient(315deg, rgba(212, 102, 59, 0.12), transparent 42%),
    var(--paper);
  color: var(--ink);
}

button,
input {
  font: inherit;
}

.app-shell {
  width: min(1180px, calc(100vw - 32px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 24px 0;
  display: grid;
  grid-template-columns: minmax(360px, 760px) minmax(300px, 360px);
  gap: 24px;
  align-items: start;
}

.board-panel,
.side-panel section {
  background: rgba(255, 250, 241, 0.9);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 48px rgba(65, 43, 22, 0.14);
}

.board-panel {
  padding: 18px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.05;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: 18px;
}

#statusText {
  margin-top: 8px;
  color: var(--muted);
  font-size: 15px;
}

.turn-badge {
  min-width: 72px;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--ink);
  color: white;
  text-align: center;
  font-weight: 700;
}

.board-wrap {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(280px, 1fr) 24px;
  grid-template-rows: 22px auto 22px;
  gap: 4px;
}

.board {
  grid-column: 2;
  grid-row: 2;
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  border: 4px solid #4f321f;
  border-radius: 8px;
  overflow: hidden;
  background: #4f321f;
  user-select: none;
}

.square {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  border: 0;
  padding: 0;
  cursor: pointer;
  transition: filter 120ms ease, outline 120ms ease;
}

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

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

.square:hover {
  filter: brightness(1.06);
}

.square.selected {
  outline: 4px solid var(--accent);
  outline-offset: -4px;
}

.square.legal::after {
  content: "";
  width: 28%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--legal);
}

.square.capture::after {
  content: "";
  position: absolute;
  inset: 12%;
  border: 5px solid var(--capture);
  border-radius: 50%;
}

.piece {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: clamp(30px, 8vw, 68px);
  line-height: 1;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.16);
}

.white-piece {
  color: #f9f4e8;
  filter: drop-shadow(0 1px 1px #1d1a16) drop-shadow(0 0 1px #1d1a16);
}

.black-piece {
  color: #151922;
  filter: drop-shadow(0 1px 1px rgba(255,255,255,0.35));
}

.files,
.rank-labels {
  color: var(--muted);
  font-weight: 700;
  font-size: 13px;
}

.files {
  grid-column: 2;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  align-items: center;
  text-align: center;
}

.top-files {
  grid-row: 1;
}

.bottom-files {
  grid-row: 3;
}

.rank-labels {
  grid-row: 2;
  display: grid;
  grid-template-rows: repeat(8, 1fr);
  align-items: center;
  text-align: center;
}

.left-ranks {
  grid-column: 1;
}

.right-ranks {
  grid-column: 3;
}

.captured-row {
  min-height: 34px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  color: var(--muted);
  font-size: 25px;
}

.captured-row:first-of-type {
  margin-bottom: 8px;
}

.captured-row:last-of-type {
  margin-top: 8px;
}

.side-panel {
  display: grid;
  gap: 18px;
}

.side-panel section {
  padding: 18px;
}

.button-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

button {
  min-height: 42px;
  border: 1px solid #bda989;
  border-radius: 8px;
  background: #fffdf7;
  color: var(--ink);
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.toggle-row,
.range-row,
.score-box {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  color: var(--muted);
}

.toggle-row input {
  width: 42px;
  height: 22px;
  accent-color: var(--accent);
}

.range-row {
  grid-template-columns: 48px 1fr 64px;
}

.range-row input {
  width: 100%;
  accent-color: var(--accent);
}

.score-box {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.5);
}

.score-box strong,
.range-row strong {
  color: var(--ink);
  text-align: right;
}

.move-log {
  height: min(44vh, 420px);
  margin: 0;
  padding-left: 28px;
  overflow: auto;
  color: var(--ink);
}

.move-log li {
  padding: 6px 4px;
  border-bottom: 1px solid rgba(217, 203, 185, 0.55);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
    width: min(760px, calc(100vw - 20px));
    padding: 10px 0 18px;
  }

  .topbar {
    align-items: flex-start;
  }

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

@media (max-width: 520px) {
  .board-panel,
  .side-panel section {
    padding: 12px;
  }

  .board-wrap {
    grid-template-columns: 18px minmax(240px, 1fr) 18px;
  }

  .button-grid {
    grid-template-columns: 1fr;
  }

  .range-row {
    grid-template-columns: 1fr;
  }

  .range-row strong {
    text-align: left;
  }
}