:root {
  --sq-light: #f0d9b5;
  --sq-dark: #b58863;
  --sq-hidden-light: #d6be9c;
  --sq-hidden-dark: #8f6f50;
  --board-edge: #302720;
  --panel-bg: rgba(17, 21, 27, 0.86);
  --piece-white: #f8f9ff;
  --piece-black: #2d2a27;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Inter", "Noto Sans", sans-serif;
  background: radial-gradient(circle at top, #2d3a45, #141b24 55%, #0f141d);
  color: #f4f7ff;
}

.page {
  max-width: 1150px;
  margin: 0 auto;
  padding: 16px;
}

.header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 2vw, 2.4rem);
}

.header p {
  margin-top: 4px;
  color: #c7d3ec;
}

.toolbar {
  display: flex;
  gap: 12px;
  align-items: center;
  margin: 12px 0;
  flex-wrap: wrap;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.toolbar-multiplayer {
  margin-top: 8px;
}

.labeled-control {
  font-size: 0.88rem;
  color: #cfdbf0;
  margin-right: 4px;
}

input,
select {
  background: #20293a;
  border: 1px solid #445b77;
  color: #f3f8ff;
  border-radius: 7px;
  padding: 8px 10px;
}

input::placeholder {
  color: #99accf;
}

button,
input,
select {
  font-family: inherit;
}

.status-info {
  margin-top: -2px;
  background: #23314a;
  border-color: #4b6c8f;
}

button {
  border: 0;
  background: #2a4764;
  color: #f3f8ff;
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
}

.status {
  margin: 8px 0 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background: #1a2d47;
  border: 1px solid #3d5e82;
  font-weight: 600;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) 320px;
  gap: 16px;
  align-items: start;
}

.board-shell {
  background: #3a3027;
  border: 2px solid var(--board-edge);
  border-radius: 10px;
  padding: 10px;
}

.board-wrap {
  width: min(84vw, 560px);
  margin: 0 auto;
}

.file-labels,
.rank-labels {
  color: #e5d2b6;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.file-labels {
  display: grid;
  grid-template-columns: 14px repeat(8, 1fr) 14px;
  align-items: center;
  justify-items: center;
  text-transform: lowercase;
}

.board-row {
  display: grid;
  grid-template-columns: 14px 1fr 14px;
  align-items: stretch;
}

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

.board {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  grid-template-rows: repeat(8, minmax(0, 1fr));
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 2px solid var(--board-edge);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.25), 0 8px 20px rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

.square {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(1.65rem, 3.9vw, 2.55rem);
  width: 100%;
  height: 100%;
  aspect-ratio: 1 / 1;
  border: 0;
  padding: 0;
  margin: 0;
  cursor: pointer;
  user-select: none;
  border: 1px solid rgba(0, 0, 0, 0.12);
  position: relative;
  overflow: hidden;
}

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

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

.square.hidden {
  background-color: var(--sq-hidden-light);
  background-image: linear-gradient(170deg, rgba(255, 255, 255, 0.16), rgba(0, 0, 0, 0.03));
}

.board .square.light.hidden {
  background-color: var(--sq-hidden-light);
}

.board .square.dark.hidden {
  background-color: var(--sq-hidden-dark);
}

.square:hover {
  filter: brightness(1.03);
}

.square:focus-visible {
  outline: 2px solid #93b8e2;
  outline-offset: -2px;
}

.square.selected {
  outline: 3px solid #ffe28a;
  outline-offset: -3px;
  box-shadow:
    inset 0 0 0 4px rgba(255, 226, 138, 0.48),
    inset 0 0 0 8px rgba(255, 196, 75, 0.22),
    0 0 0 1px rgba(255, 244, 207, 0.9),
    0 0 18px rgba(255, 206, 92, 0.65);
  z-index: 1;
}

.square.selected::after {
  content: "";
  position: absolute;
  inset: 10%;
  border: 2px solid rgba(255, 245, 204, 0.9);
  border-radius: 9px;
  pointer-events: none;
  animation: selectedPulse 1.2s ease-in-out infinite;
}

@keyframes selectedPulse {
  0% {
    opacity: 0.95;
    transform: scale(1);
  }

  50% {
    opacity: 0.45;
    transform: scale(0.97);
  }

  100% {
    opacity: 0.95;
    transform: scale(1);
  }
}

.piece {
  font-family: "Noto Sans Symbols 2", "Noto Serif", "Times New Roman", serif;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.45);
  font-weight: 600;
  line-height: 1;
}

.piece.white {
  color: var(--piece-white);
}

.piece.black {
  color: var(--piece-black);
}

.piece-capturable {
  border: 1px dashed rgba(255, 230, 140, 0.7);
}

.side-panel {
  display: grid;
  gap: 12px;
}

.panel-card {
  background: var(--panel-bg);
  border: 1px solid #3a4d62;
  border-radius: 10px;
  padding: 10px 12px;
}

.panel-card h2 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.panel-card p {
  margin: 6px 0;
}

.events {
  max-height: 140px;
  overflow: auto;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.events li {
  background: #243b59;
  border-left: 3px solid #7fb3e8;
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 0.92rem;
}

.events li.event-white {
  background: #f8f8f8;
  color: #1b1b1b;
  border-left-color: #d9d9d9;
}

.events li.event-black {
  background: #151515;
  color: #f7f7f7;
  border-left-color: #4d4d4d;
}

.events li.event-neutral {
  background: #243b59;
  color: #f4f7ff;
  border-left-color: #7fb3e8;
}

.log-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.log-table th,
.log-table td {
  border-bottom: 1px solid #375774;
  padding: 4px 6px;
  text-align: left;
}

.log-table th {
  color: #b5cbeb;
}

.log-table td.masked {
  letter-spacing: 0.08em;
  font-weight: 700;
}

.log-table td.move-cell {
  cursor: pointer;
  transition: background-color 140ms ease, color 140ms ease;
}

.log-table td.move-cell:hover {
  background: rgba(110, 174, 235, 0.18);
}

.log-table td.move-cell.active {
  background: rgba(255, 218, 118, 0.28);
  color: #ffeec1;
  font-weight: 700;
}

.replay-controls {
  margin-top: 8px;
  display: flex;
  gap: 8px;
}

.replay-banner {
  margin: 8px 0 0;
  font-size: 0.86rem;
  color: #d7e5ff;
  background: rgba(49, 71, 99, 0.6);
  border: 1px solid #4b6689;
  padding: 8px 9px;
  border-radius: 8px;
}

@media (max-width: 880px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .board-wrap {
    width: min(92vw, 560px);
  }

  .board {
    width: min(92vw, 560px);
  }
}