:root{
  --bg: #161009;
  --panel: #221a11;
  --panel-border: #3a2c19;
  --wood-light: #ecdcb8;
  --wood-dark: #8a5a34;
  --brass: #c9a227;
  --brass-bright: #e9c860;
  --text: #f3ead9;
  --text-dim: #b6a488;
  --text-faint: #7d6c53;
  --check-red: #b3402c;
  --win-green: #6fae5a;
  --font-display: 'Cinzel', serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

*,*::before,*::after{ box-sizing: border-box; }

body{
  margin:0;
  min-height:100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 50% -10%, #2a1f12 0%, var(--bg) 55%);
  color: var(--text);
  font-family: var(--font-body);
  padding: 28px 14px 50px;
}

.app{
  max-width: 1180px;
  margin: 0 auto;
}

/* ── HEADER ── */
.app-header{
  text-align:center;
  margin-bottom: 34px;
}
.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--brass);
  margin: 0 0 10px;
}
.app-header h1{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin: 0 0 10px;
  letter-spacing: 1px;
  color: var(--wood-light);
  text-shadow: 0 2px 18px rgba(201,162,39,0.18);
}
.tagline{
  color: var(--text-dim);
  font-size: 0.95rem;
  margin: 0;
}

/* ── TABLE LAYOUT ── */
.table{
  display: grid;
  grid-template-columns: 210px minmax(0,auto) 210px;
  gap: 24px;
  align-items: start;
  justify-content: center;
}

/* ── PLAYER PANELS ── */
.player-panel{
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 20px 18px;
  position: sticky;
  top: 20px;
  transition: border-color 0.4s, box-shadow 0.4s, opacity 0.4s, filter 0.4s;
}
.player-name{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  display:flex;
  align-items:center;
  gap:10px;
  color: var(--wood-light);
  margin-bottom: 8px;
}
.player-icon{ font-size: 1.4rem; color: var(--brass); }
.winner-badge{
  margin-left: auto;
  font-size: 1.3rem;
  animation: badge-pop 0.5s ease;
}
.player-status{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 0 0 18px;
  padding: 6px 10px;
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  display: inline-block;
  transition: all 0.3s;
}
.player-panel.active .player-status{
  color: #1a1a1a;
  background: var(--brass-bright);
  border-color: var(--brass-bright);
}
.player-panel.winner{
  border-color: var(--brass-bright);
  box-shadow: 0 0 0 1px var(--brass-bright), 0 0 24px rgba(233,200,96,0.35);
}
.player-panel.loser{
  opacity: 0.55;
  filter: grayscale(55%);
}
.player-panel.draw{
  border-color: var(--text-faint);
  opacity: 0.85;
}
.captured-label{
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 8px;
  display:flex;
  align-items:center;
  gap: 8px;
}
.adv-tag{
  font-size: 0.68rem;
  color: var(--win-green);
  background: rgba(111,174,90,0.12);
  border: 1px solid rgba(111,174,90,0.4);
  padding: 1px 7px;
  border-radius: 10px;
  letter-spacing: 0.5px;
}
.captured-row{
  min-height: 42px;
  font-size: 1.5rem;
  line-height: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  color: var(--text-dim);
}
.captured-row span{ animation: piece-pop 0.35s ease; }

/* ── BOARD ── */
.board-wrap{
  display:flex;
  flex-direction: column;
  align-items:center;
  gap: 16px;
}

.turn-banner{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 1px;
  color: var(--brass-bright);
  padding: 8px 22px;
  border: 1px solid var(--brass);
  border-radius: 24px;
  background: rgba(201,162,39,0.08);
  transition: all 0.3s;
}

.board-frame{
  background: linear-gradient(155deg, #3a2712, #1c1409);
  border: 2px solid var(--brass);
  border-radius: 10px;
  padding: 10px 12px 12px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.55), inset 0 0 0 1px rgba(233,200,96,0.1);
}

.files-row{
  display:grid;
  grid-template-columns: 26px repeat(8, var(--sq, 58px));
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-faint);
  text-align:center;
  margin-bottom: 4px;
}

.ranks-and-board{
  display:flex;
  align-items:stretch;
}
.ranks-col{
  display:flex;
  flex-direction: column;
  width: 26px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-faint);
}
.ranks-col span{
  height: var(--sq, 58px);
  display:flex;
  align-items:center;
  justify-content:center;
}

#board{
  --sq: 58px;
  width: calc(var(--sq) * 8);
  height: calc(var(--sq) * 8);
  display:grid;
  grid-template-columns: repeat(8, var(--sq));
  grid-template-rows: repeat(8, var(--sq));
  border: 3px solid #14100a;
  border-radius: 4px;
  overflow: hidden;
}

.square{
  width: var(--sq, 58px);
  height: var(--sq, 58px);
  display:flex;
  align-items:center;
  justify-content:center;
  font-size: calc(var(--sq, 58px) * 0.62);
  cursor: pointer;
  position: relative;
  user-select: none;
  transition: background 0.15s;
}
.square.light{ background: var(--wood-light); color:#241a0e; }
.square.dark{ background: var(--wood-dark); color:#241a0e; }
@media (hover: hover) and (pointer: fine) {
  .square:hover{ filter: brightness(1.08); }
}
.square:active{ transform: scale(0.96); }

.square .piece-glyph{
  position: relative;
  z-index: 2;
  filter: drop-shadow(0 1px 1px rgba(0,0,0,0.35));
}
.square.piece-white .piece-glyph{ color:#fbf6ea; -webkit-text-stroke: 1px #3a2712; }
.square.piece-black .piece-glyph{ color:#1c140a; }

.square.selected{
  box-shadow: inset 0 0 0 4px var(--brass-bright);
}
.square.last-move{
  background: rgba(201,162,39,0.35);
}
.square.in-check{
  background: radial-gradient(circle, rgba(179,64,44,0.85) 0%, rgba(179,64,44,0.55) 60%, transparent 100%);
  animation: check-pulse 0.9s ease-in-out infinite;
}
.square.valid-move::after{
  content:'';
  position:absolute;
  width: 26%;
  height: 26%;
  border-radius: 50%;
  background: rgba(30,20,10,0.35);
  z-index: 1;
  animation: dot-in 0.15s ease;
}
.square.valid-capture::after{
  content:'';
  position:absolute;
  inset: 8%;
  border-radius: 50%;
  border: 4px solid rgba(179,64,44,0.75);
  background: transparent;
  z-index:1;
  animation: dot-in 0.15s ease;
}
.square .piece-glyph.just-moved{
  animation: piece-pop 0.28s cubic-bezier(.34,1.56,.64,1);
}

/* ── CONTROLS / RESULT ── */
.controls{ margin-top: 4px; }
button#restartBtn{
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 1px;
  font-size: 0.9rem;
  padding: 10px 26px;
  border-radius: 8px;
  border: 1.5px solid var(--brass);
  background: transparent;
  color: var(--brass-bright);
  cursor: pointer;
  transition: all 0.25s;
}
@media (hover: hover) and (pointer: fine) {
  button#restartBtn:hover{
    background: var(--brass);
    color: #1a1206;
  }
}
button#restartBtn:active{ transform: scale(0.97); }

.result-banner{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--brass-bright);
  background: rgba(201,162,39,0.1);
  border: 1px solid var(--brass);
  padding: 10px 24px;
  border-radius: 10px;
  text-align:center;
  animation: banner-in 0.4s ease;
}
.hidden{ display:none !important; }

/* ── SCORE PANEL ── */
.score-panel{
  max-width: 480px;
  margin: 40px auto 0;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  padding: 20px 24px 24px;
  text-align: center;
}
.score-panel h2{
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 1.5px;
  color: var(--wood-light);
  margin: 0 0 16px;
}
.score-row{
  display:flex;
  align-items:center;
  justify-content:center;
  gap: 22px;
}
.score-block{
  display:flex;
  flex-direction: column;
  align-items:center;
  gap: 4px;
  min-width: 90px;
}
.score-name{
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-faint);
}
.score-points{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 2.6rem;
  color: var(--brass-bright);
  line-height: 1;
  transition: transform 0.25s;
}
.score-points.bump{ animation: score-bump 0.35s ease; }
.score-divider{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 2px;
  color: var(--text-faint);
}
.score-advantage{
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.5px;
}

/* ── PROMOTION MODAL ── */
.modal{
  position: fixed; inset:0;
  background: rgba(10,7,3,0.75);
  display:flex; align-items:center; justify-content:center;
  z-index: 999;
}
.modal-card{
  background: var(--panel);
  border: 1px solid var(--brass);
  border-radius: 14px;
  padding: 26px 30px;
  text-align:center;
  animation: banner-in 0.3s ease;
}
.modal-title{
  font-family: var(--font-display);
  color: var(--wood-light);
  margin: 0 0 16px;
  letter-spacing: 1px;
}
.promotion-options{
  display:flex;
  gap: 12px;
}
.promotion-options button{
  width: 60px; height: 60px;
  font-size: 2rem;
  border-radius: 10px;
  border: 1.5px solid var(--brass);
  background: rgba(201,162,39,0.08);
  color: var(--wood-light);
  cursor:pointer;
  transition: all 0.2s;
}
@media (hover: hover) and (pointer: fine) {
  .promotion-options button:hover{
    background: var(--brass);
    color: #1a1206;
    transform: translateY(-2px);
  }
}
.promotion-options button:active{ transform: scale(0.94); }

/* ── ANIMATIONS ── */
@keyframes piece-pop{
  0%{ transform: scale(0.55); opacity: 0.6; }
  60%{ transform: scale(1.15); opacity: 1; }
  100%{ transform: scale(1); }
}
@keyframes dot-in{
  from{ transform: scale(0.3); opacity: 0; }
  to{ transform: scale(1); opacity: 1; }
}
@keyframes check-pulse{
  0%,100%{ filter: brightness(1); }
  50%{ filter: brightness(1.25); }
}
@keyframes banner-in{
  from{ transform: translateY(-8px); opacity: 0; }
  to{ transform: translateY(0); opacity: 1; }
}
@keyframes badge-pop{
  0%{ transform: scale(0) rotate(-20deg); opacity:0; }
  70%{ transform: scale(1.3) rotate(8deg); opacity:1; }
  100%{ transform: scale(1) rotate(0); }
}
@keyframes score-bump{
  0%{ transform: scale(1); }
  40%{ transform: scale(1.28); color: var(--win-green); }
  100%{ transform: scale(1); }
}

/* ── RESPONSIVE ── */
@media (max-width: 980px){
  .table{
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 18px;
  }
  .player-panel{
    position: static;
    width: 100%;
    max-width: 420px;
  }
  #whitePanel{ order: 2; }
  .board-wrap{ order: 1; }
  #blackPanel{ order: 3; }
}

@media (max-width: 700px){
  body{ padding: 22px 12px 40px; }
  .app-header{ margin-bottom: 22px; }
  .board-frame{ padding: 8px 8px 10px; }
  .player-panel{ padding: 16px 16px; }
  .captured-row{ font-size: 1.3rem; }
}

@media (max-width: 560px){
  #board{ --sq: 42px; }
  .files-row{ grid-template-columns: 18px repeat(8, var(--sq,42px)); font-size: 0.58rem; }
  .ranks-col{ width: 18px; font-size: 0.58rem; }
  .ranks-col span{ height: var(--sq,42px); }
  .app-header h1{ font-size: 1.6rem; }
  .tagline{ font-size: 0.82rem; padding: 0 6px; }
  .promotion-options button{ width: 46px; height: 46px; font-size: 1.4rem; }
  .score-points{ font-size: 2rem; }
  .score-panel{ padding: 16px 14px 20px; margin-top: 26px; }
  .turn-banner{ font-size: 0.9rem; padding: 6px 16px; }
  .result-banner{ font-size: 1.05rem; padding: 8px 16px; }
}

@media (max-width: 400px){
  body{ padding: 16px 8px 32px; }
  #board{ --sq: 34px; }
  .files-row{ grid-template-columns: 15px repeat(8, var(--sq,34px)); font-size: 0.52rem; }
  .ranks-col{ width: 15px; font-size: 0.52rem; }
  .ranks-col span{ height: var(--sq,34px); }
  .board-frame{ padding: 6px 6px 8px; border-width: 1.5px; }
  #board{ border-width: 2px; }
  .square{ font-size: calc(var(--sq, 34px) * 0.6); }
  .app-header h1{ font-size: 1.35rem; letter-spacing: 0.5px; }
  .eyebrow{ font-size: 0.62rem; letter-spacing: 2px; }
  .score-row{ gap: 12px; }
  .score-block{ min-width: 70px; }
  .score-points{ font-size: 1.6rem; }
  .player-name{ font-size: 1rem; }
  .player-icon{ font-size: 1.2rem; }
  .captured-row{ font-size: 1.1rem; min-height: 34px; }
  .promotion-options{ gap: 8px; }
  .promotion-options button{ width: 42px; height: 42px; font-size: 1.25rem; }
}

@media (max-width: 340px){
  #board{ --sq: 30px; }
  .files-row{ grid-template-columns: 13px repeat(8, var(--sq,30px)); }
  .ranks-col{ width: 13px; }
  .ranks-col span{ height: var(--sq,30px); }
}