:root {
  --bg: #f2eee6;
  --surface: #fffaf1;
  --surface-strong: #ffffff;
  --text: #151922;
  --muted: #626b78;
  --border: rgba(21, 25, 34, 0.15);
  --wood-outer: #3a2416;
  --wood-inner: #8b5d35;
  --light-square: #f0d9b5;
  --dark-square: #b58863;
  --selected: #2563eb;
  --selected-soft: rgba(37, 99, 235, 0.22);
  --legal: rgba(37, 99, 235, 0.38);
  --last: rgba(250, 204, 21, 0.45);
  --danger: #b91c1c;
  --danger-soft: rgba(185, 28, 28, 0.32);
  --shadow: 0 24px 70px rgba(18, 20, 28, 0.18);
  --board-size: min(76vw, calc(100svh - 9.6rem), 760px);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); overflow-x: hidden; touch-action: manipulation; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 0%, rgba(139, 93, 53, 0.18), transparent 28rem),
    linear-gradient(135deg, #faf6ee 0%, var(--bg) 100%);
  overflow-x: hidden;
  touch-action: manipulation;
  overscroll-behavior: none;
}

button, a { -webkit-tap-highlight-color: transparent; touch-action: manipulation; -webkit-touch-callout: none; }
button {
  border: 1px solid var(--border);
  border-radius: 15px;
  padding: 0.82rem 1rem;
  background: #111827;
  color: #ffffff;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  min-height: 50px;
}
button:active { transform: translateY(1px); }
button:hover { filter: brightness(1.04); }
button:focus-visible, a:focus-visible, .square:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.82);
  outline-offset: 3px;
}
a { color: inherit; }

.app-shell {
  width: min(1280px, 100%);
  margin: 0 auto;
  padding: max(1rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) max(1.25rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.55rem;
}
.topbar > div:first-child {
  display: inline-flex;
  align-items: baseline;
  gap: 0.42rem;
  min-width: 0;
}
.version {
  margin: 0;
  color: var(--muted);
  font-size: 0.56rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.72;
}
h1, h2 { margin: 0; line-height: 1.08; }
h1 {
  font-size: clamp(0.68rem, 1.4vw, 0.88rem);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.76;
}
h2 { font-size: 1.05rem; }
.toplinks a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.72rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 250, 241, 0.72);
  text-decoration: none;
  font-weight: 850;
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 390px);
  gap: 1.1rem;
  align-items: start;
}
.board-panel, .side-panel { min-width: 0; }
.board-panel {
  position: sticky;
  top: max(0.75rem, env(safe-area-inset-top));
  align-self: start;
  z-index: 2;
}
.side-panel {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: visible;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
}
.status-card, .material-panel, .controls-card, .tools-card, .history-card, .commentary-card, .famous-games-card, .practice-card, .analysis-card, .resources-card, .online-card, .board-viewer-bar, .license-card {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: rgba(255, 250, 241, 0.9);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.status-card {
  margin-bottom: 0.9rem;
  padding: 0.9rem 1rem;
  font-weight: 900;
  transition: color 160ms ease, background 160ms ease, border-color 160ms ease;
}
.status-card.check { color: var(--danger); }

.board-shell {
  width: var(--board-size);
  max-width: 100%;
  margin: 0 auto;
  padding: clamp(9px, 1.4vw, 16px);
  border-radius: clamp(18px, 2.8vw, 34px);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.22), rgba(0, 0, 0, 0.08)),
    linear-gradient(45deg, var(--wood-outer), var(--wood-inner));
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(255,255,255,0.18);
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

.board-stage {
  position: relative;
  width: var(--board-size);
  max-width: 100%;
  margin: 0 auto;
}
.evaluation-bar {
  position: absolute;
  left: 3px;
  top: 3px;
  bottom: 3px;
  z-index: 8;
  width: 5px;
  pointer-events: none;
}
.eval-bar-label {
  position: absolute;
  left: 0;
  top: -1.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  padding: 0.1rem 0.22rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  color: #f8fafc;
  font-size: clamp(0.52rem, 1vw, 0.68rem);
  font-weight: 950;
  line-height: 1;
  box-shadow: 0 2px 8px rgba(0,0,0,0.24);
}
.eval-bar-track {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border: 1px solid rgba(15, 23, 42, 0.72);
  border-radius: 999px;
  background: #0f172a;
  box-shadow: 0 2px 10px rgba(0,0,0,0.28);
}
.eval-bar-white {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 50%;
  background: #f8fafc;
  transition: height 180ms ease;
}

.material-panel {
  width: var(--board-size);
  max-width: 100%;
  margin: 0.55rem auto 0.7rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 0.55rem;
  padding: 0.45rem 0.62rem;
  box-shadow: none;
  font-size: 0.78rem;
}
.material-line {
  min-width: 0;
  display: grid;
  gap: 0.18rem;
}
.material-line:last-child { text-align: right; }
.material-label {
  color: var(--muted);
  font-size: 0.67rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.captured-list {
  min-height: 1.28rem;
  display: flex;
  align-items: center;
  gap: 0.05rem;
  overflow: hidden;
}
.material-line:last-child .captured-list { justify-content: flex-end; }
.captured-piece {
  width: 1.28rem;
  height: 1.28rem;
  object-fit: contain;
  filter: drop-shadow(0 1px 1px rgba(0,0,0,0.18));
}
.captured-empty { color: var(--muted); font-weight: 900; opacity: 0.62; }
.material-balance {
  white-space: nowrap;
  font-size: 0.82rem;
  font-weight: 950;
}
.chess-board {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  grid-template-rows: repeat(8, minmax(0, 1fr));
  overflow: hidden;
  border: clamp(5px, 0.9vw, 9px) solid rgba(43, 27, 17, 0.78);
  border-radius: clamp(12px, 2.1vw, 24px);
  background: var(--wood-outer);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.13);
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  overscroll-behavior: contain;
}


.chess-board { position: relative; }

.chess-board.time-expired-lock, .chess-board.game-ended-lock {
  filter: grayscale(0.62) brightness(0.88);
  pointer-events: none;
}
.chess-board.time-expired-lock::after, .chess-board.game-ended-lock::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 12;
  background: rgba(148, 163, 184, 0.42);
  pointer-events: none;
}

.square {
  position: relative;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 0;
  min-width: 0;
  min-height: 0;
  width: 100%;
  height: 100%;
  padding: 0;
  background: transparent;
  color: inherit;
  line-height: 1;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  transition: none;
}
.square:active { transform: none; }
.square:hover { filter: brightness(1.035); }
.square.light { background: linear-gradient(135deg, #f6e3c5 0%, var(--light-square) 100%); }
.square.dark { background: linear-gradient(135deg, #c09168 0%, var(--dark-square) 100%); }
.square.selected { box-shadow: inset 0 0 0 999px var(--selected-soft); }
.square.selected::after {
  content: "";
  position: absolute;
  inset: 7%;
  border: clamp(3px, 0.55vw, 5px) solid var(--selected);
  border-radius: 18%;
  pointer-events: none;
}
.square.legal::before {
  content: "";
  position: absolute;
  width: 25%;
  height: 25%;
  border-radius: 999px;
  background: var(--legal);
  pointer-events: none;
  z-index: 2;
}
.square.capture::before {
  width: 78%;
  height: 78%;
  background: transparent;
  border: clamp(4px, 0.7vw, 6px) solid var(--legal);
}
.square.last { box-shadow: inset 0 0 0 999px var(--last); }
.square.selected.last { box-shadow: inset 0 0 0 999px var(--last), inset 0 0 0 999px var(--selected-soft); }
.square.king-check { box-shadow: inset 0 0 0 999px var(--danger-soft); }
.square.king-check::after {
  content: "";
  position: absolute;
  inset: 6%;
  border: clamp(3px, 0.55vw, 5px) solid var(--danger);
  border-radius: 18%;
  pointer-events: none;
  z-index: 3;
}
.piece-img {
  width: 92%;
  height: 92%;
  display: block;
  object-fit: contain;
  pointer-events: none;
  filter: drop-shadow(0 3px 3px rgba(0, 0, 0, 0.22));
  z-index: 1;
}
.coord-file, .coord-rank {
  position: absolute;
  z-index: 4;
  font-size: clamp(0.54rem, 1.25vw, 0.82rem);
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
  opacity: 0.78;
}
.coord-file { right: 7%; bottom: 6%; }
.coord-rank { left: 7%; top: 6%; }
.square.light .coord-file, .square.light .coord-rank { color: rgba(81, 54, 33, 0.74); }
.square.dark .coord-file, .square.dark .coord-rank { color: rgba(255, 238, 210, 0.76); }

.side-panel { display: grid; gap: 1rem; }

.board-viewer-bar {
  width: var(--board-size);
  max-width: 100%;
  margin: 0.7rem auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  box-shadow: none;
  padding: 0.55rem 0.65rem;
}
.board-viewer-bar .viewer-status {
  text-align: right;
  margin-left: auto;
  white-space: nowrap;
}
.priority-history {
  order: -2;
}
.controls-card, .tools-card, .history-card, .commentary-card, .famous-games-card, .practice-card, .analysis-card, .resources-card, .online-card, .board-viewer-bar, .license-card { padding: 1rem; }
.button-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.72rem; margin-top: 0.85rem; }
.tools-card, .famous-games-card, .practice-card, .analysis-card, .resources-card, .online-card { display: grid; gap: 0.72rem; }
.tools-card label, .famous-games-card label, .practice-card label, .analysis-card label, .resources-card label, .online-card label { font-size: 0.86rem; font-weight: 900; color: var(--muted); }
.inline-form { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.55rem; }
input, textarea, select { width: 100%; border: 1px solid var(--border); border-radius: 14px; padding: 0.82rem 0.9rem; background: #f8fafc; color: #111827; font: inherit; font-weight: 760; }
select { background: #f8fafc; color: #111827; border-color: rgba(255, 255, 255, 0.82); font-weight: 900; }
select option { background: #f8fafc; color: #111827; font-weight: 800; }
.analysis-card select, .tools-card input, .tools-card textarea, .resources-card input, .online-card input { background: #ffffff; color: #111827; border-color: rgba(255, 255, 255, 0.9); box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.12); }
input::placeholder, textarea::placeholder { color: #64748b; opacity: 1; }
textarea { resize: vertical; min-height: 8.5rem; line-height: 1.4; }
input:focus-visible, textarea:focus-visible, select:focus-visible { outline: 3px solid rgba(37, 99, 235, 0.82); outline-offset: 2px; }

.viewer-controls {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.34rem;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
}
.viewer-controls button {
  flex: 0 0 auto;
  width: 2.25rem;
  min-width: 2.25rem;
  min-height: 2.05rem;
  padding: 0.12rem 0.32rem;
  border-radius: 999px;
  font-size: 1.02rem;
  line-height: 1;
}
.viewer-controls button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  filter: grayscale(0.3);
}
.viewer-status {
  min-height: 1.3rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 850;
}
.move-row.current-viewer-move {
  border-color: rgba(37, 99, 235, 0.62);
  box-shadow: inset 0 0 0 2px rgba(37, 99, 235, 0.16);
}
.move-cell.current-viewer-ply {
  color: #0f3ea8;
  font-weight: 950;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}
@media (prefers-color-scheme: dark) {
  .move-cell.current-viewer-ply { color: #93c5fd; }
}

.tools-message { min-height: 1.35rem; margin: 0; color: var(--muted); font-size: 0.9rem; font-weight: 800; }
.tools-message.error { color: var(--danger); }
.button-grid button, .promotion-options button { min-height: 54px; }
.hint { margin: 0.85rem 0 0; color: var(--muted); font-size: 0.94rem; line-height: 1.48; }
.history-head { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.history-head span { color: var(--muted); font-size: 0.86rem; font-weight: 850; }
.move-history {
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.42rem;
  max-height: min(45svh, 430px);
  -webkit-overflow-scrolling: touch;
  overflow: auto;
  overscroll-behavior: contain;
}
.move-row {
  display: grid;
  grid-template-columns: 2.3rem minmax(0, 1fr) minmax(0, 1fr);
  gap: 0.45rem;
  padding: 0.58rem 0.68rem;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.58);
  font-weight: 780;
}
.move-cell { min-width: 0; overflow-wrap: anywhere; }
.move-button {
  min-height: 0;
  width: 100%;
  border: 0;
  border-radius: 9px;
  padding: 0.12rem 0.24rem;
  background: transparent;
  color: inherit;
  font: inherit;
  font-weight: 850;
  text-align: left;
}
.move-button:hover, .move-button:focus-visible { background: rgba(37, 99, 235, 0.12); filter: none; }
.move-button:active { transform: none; }
.move-row .num { color: var(--muted); }
.move-row .empty { color: rgba(91, 100, 114, 0.45); }

.commentary-card {
  display: grid;
  gap: 0.52rem;
}
.move-commentary {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.48;
  font-weight: 760;
}
.move-commentary strong {
  color: var(--text);
  font-weight: 930;
}

.move-animation-ghost {
  position: fixed;
  z-index: 1001;
  transform: translate(-50%, -50%);
  pointer-events: none;
  object-fit: contain;
  filter: drop-shadow(0 8px 10px rgba(0, 0, 0, 0.28));
  transition: left 90ms cubic-bezier(0.2, 0.8, 0.2, 1), top 90ms cubic-bezier(0.2, 0.8, 0.2, 1), opacity 80ms ease;
  will-change: left, top, opacity;
}
.square.animating-destination .piece-img { opacity: 1; }
@media (prefers-reduced-motion: reduce) {
  .move-animation-ghost { transition: none; }
  .square, .status-card { transition: none; }
}

.promotion-dialog {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(17, 24, 39, 0.62);
}
.promotion-dialog[hidden] { display: none; }
.promotion-box {
  width: min(420px, 100%);
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 24px;
  background: var(--surface-strong);
  padding: 1rem;
  box-shadow: var(--shadow);
}
.promotion-box p { margin: 0.5rem 0 0.9rem; color: var(--muted); }
.promotion-options { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }

.license-page .app-shell { max-width: 920px; }
.license-card { line-height: 1.55; }
.license-card h2 { margin-top: 1.25rem; }
.license-card h2:first-child { margin-top: 0; }
.license-card code { word-break: break-word; }
.license-card pre {
  overflow: auto;
  padding: 1rem;
  border-radius: 16px;
  background: rgba(17,24,39,0.08);
  white-space: pre-wrap;
}

@media (max-width: 940px) {
  :root { --board-size: min(calc(100svw - max(0.34rem, env(safe-area-inset-left)) - max(0.34rem, env(safe-area-inset-right))), calc(100svh - 7.2rem), 860px); }
  .app-shell {
    padding-left: max(0.38rem, env(safe-area-inset-left));
    padding-right: max(0.38rem, env(safe-area-inset-right));
  }
  .game-layout { grid-template-columns: 1fr; gap: 0.75rem; }
  .board-panel {
    top: max(0.25rem, env(safe-area-inset-top));
  }
  .side-panel { grid-template-columns: 1fr; }
  .status-card { margin-bottom: 0.42rem; padding: 0.68rem 0.82rem; }
  .material-panel { margin-top: 0.34rem; margin-bottom: 0.48rem; }
  .board-shell { padding: 4px; border-radius: 12px; }
  .chess-board { border-width: 3px; border-radius: 8px; }
  .move-history { max-height: 260px; }
}
.compact-form { grid-template-columns: minmax(0, 1fr) auto; }
.game-meta { display: grid; gap: 0.24rem; margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.38; }
.game-meta p { margin: 0; }
.game-meta strong { color: var(--text); }
.practice-actions { display: flex; gap: 0.55rem; align-items: center; }
.practice-actions button { min-height: 42px; padding: 0.58rem 0.8rem; border-radius: 999px; }

.engine-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 1.8rem;
  padding: 0.24rem 0.62rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.48);
  font-size: 0.72rem;
  font-weight: 950;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.engine-output {
  display: grid;
  gap: 0.36rem;
  padding: 0.72rem 0.78rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.48);
  color: var(--text);
}
.engine-output p { margin: 0; }
.engine-status { color: var(--muted); font-weight: 850; }
.engine-status.error { color: var(--danger); }
.compact-hint { margin-top: 0; font-size: 0.82rem; }

.tactic-feedback.success { color: #047857; }
.tactic-feedback.error { color: var(--danger); }


@media (max-width: 560px) {
  :root { --board-size: min(calc(100svw - max(0.12rem, env(safe-area-inset-left)) - max(0.12rem, env(safe-area-inset-right))), calc(100svh - 6.3rem)); }
  .app-shell {
    padding-left: max(0.08rem, env(safe-area-inset-left));
    padding-right: max(0.08rem, env(safe-area-inset-right));
    padding-bottom: max(0.9rem, env(safe-area-inset-bottom));
  }
  .topbar { align-items: flex-start; margin-bottom: 0.72rem; padding-inline: 0.35rem; }
  .toplinks a { min-height: 38px; padding: 0.5rem 0.66rem; font-size: 0.88rem; }
  h1 { font-size: clamp(2.15rem, 14vw, 3.35rem); }
  .status-card { margin-inline: 0.18rem; margin-bottom: 0.34rem; padding: 0.58rem 0.72rem; }
  .material-panel { max-width: none; grid-template-columns: minmax(0, 1fr) auto; gap: 0.38rem; margin-top: 0.26rem; margin-bottom: 0.4rem; padding: 0.38rem 0.48rem; font-size: 0.72rem; }
  .material-line:last-child { grid-column: 1 / -1; text-align: left; }
  .material-line:last-child .captured-list { justify-content: flex-start; }
  .material-label { font-size: 0.6rem; }
  .captured-piece { width: 1.08rem; height: 1.08rem; }
  .board-shell { padding: 2px; border-radius: 9px; width: var(--board-size); max-width: none; }
  .evaluation-bar { left: 2px; top: 2px; bottom: 2px; width: 4px; }
  .eval-bar-label { top: -1.05rem; min-width: 1.9rem; padding: 0.08rem 0.18rem; font-size: 0.5rem; }
  .chess-board { border-width: 2px; border-radius: 6px; }
  .board-viewer-bar { width: var(--board-size); max-width: none; flex-wrap: wrap; justify-content: center; margin-top: 0.48rem; padding: 0.48rem 0.54rem; }
  .board-viewer-bar .viewer-status { width: 100%; text-align: center; margin-left: 0; white-space: normal; }
  .viewer-controls { justify-content: center; }
  .button-grid, .promotion-options, .inline-form { grid-template-columns: 1fr; }
  .button-grid button, .promotion-options button { min-height: 54px; }
  .move-row { grid-template-columns: 2rem minmax(0, 1fr) minmax(0, 1fr); padding: 0.58rem 0.6rem; }
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1218;
    --surface: #171b23;
    --surface-strong: #171b23;
    --text: #f8fafc;
    --muted: #aab3c2;
    --border: rgba(248, 250, 252, 0.14);
    --wood-outer: #241811;
    --wood-inner: #6b452b;
    --light-square: #d7bd97;
    --dark-square: #8d6041;
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.28);
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
  }
  body { background: radial-gradient(circle at 18% 0%, rgba(201, 176, 141, 0.12), transparent 28rem), #0f1218; }
  .toplinks a, .status-card, .material-panel, .controls-card, .tools-card, .history-card, .commentary-card, .famous-games-card, .practice-card, .analysis-card, .resources-card, .online-card, .board-viewer-bar, .license-card { background: rgba(23, 27, 35, 0.9); }
  .move-row { background: rgba(255, 255, 255, 0.06); }
  button { background: #f8fafc; color: #111827; }
  input, textarea, select, .analysis-card select, .tools-card input, .tools-card textarea, .resources-card input, .online-card input, .resources-card input { background: #f8fafc; color: #0f172a; border-color: rgba(255, 255, 255, 0.95); }
input::placeholder, textarea::placeholder { color: #475569; opacity: 1; }
  input::placeholder, textarea::placeholder { color: #64748b; opacity: 1; }
}

/* v1.4: interacción táctil/ratón con arrastre real */
.square { cursor: pointer; }
.square:has(.piece-img) { cursor: grab; }
.chess-board.is-dragging, .chess-board.is-dragging .square { cursor: grabbing; }
.square.drag-origin .piece-img { opacity: 0.28; }
.drag-ghost {
  position: fixed;
  z-index: 1000;
  width: clamp(44px, 8vw, 86px);
  height: clamp(44px, 8vw, 86px);
  transform: translate(-50%, -50%);
  pointer-events: none;
  filter: drop-shadow(0 12px 18px rgba(0, 0, 0, 0.34));
  will-change: left, top;
}
.piece-img {
  width: 88%;
  height: 88%;
  -webkit-user-drag: none;
  user-select: none;
}
.promotion-options button {
  display: grid;
  place-items: center;
}

.section-head.compact-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}
.practice-progress {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.1rem;
  min-height: 2rem;
  padding: 0.28rem 0.62rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.48);
  font-size: 0.78rem;
  font-weight: 950;
}
.practice-actions {
  flex-wrap: wrap;
}
.practice-actions button {
  flex: 1 1 auto;
}


.tactic-feedback.success {
  color: #15803d;
}

@media (prefers-color-scheme: dark) {
  .practice-progress, .engine-badge, .engine-output {
    background: rgba(255, 255, 255, 0.06);
  }
  

.tactic-feedback.success {
    color: #86efac;
  }
}

/* v2.2.1: barra de evaluación fina, sin tapar casillas */
.board-shell { position: relative; }
.tools-card input::placeholder, .tools-card textarea::placeholder { color: #475569; opacity: 1; }
.analysis-card select { background: #f8fafc; color: #0f172a; }

/* v2.3: tablero prioritario y editor de posiciones */
:root {
  --board-size: min(calc(100vw - 430px - 2rem), calc(100svh - 3.8rem), 980px);
}

.app-shell {
  width: min(1480px, 100%);
}

@media (min-width: 941px) {
  .game-layout {
    grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
    gap: 0.85rem;
  }
  .topbar {
    margin-bottom: 0.65rem;
  }
  .status-card {
    margin-bottom: 0.55rem;
    padding-block: 0.68rem;
  }
}

.board-stage {
  overflow: visible;
}

.evaluation-bar {
  left: clamp(3px, 0.45vw, 7px);
  top: clamp(8px, 1vw, 13px);
  bottom: clamp(8px, 1vw, 13px);
  width: clamp(3px, 0.36vw, 5px);
  z-index: 7;
}

.eval-bar-track {
  border-radius: 999px;
  border-width: 1px;
}

.eval-bar-label {
  left: -0.25rem;
  top: -1.05rem;
  min-width: 1.8rem;
  font-size: clamp(0.48rem, 0.75vw, 0.62rem);
}

.position-editor-card {
  display: grid;
  gap: 0.72rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: rgba(255, 250, 241, 0.9);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.position-editor-card label {
  font-size: 0.86rem;
  font-weight: 900;
  color: var(--muted);
}

.editor-status {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 1.8rem;
  padding: 0.24rem 0.62rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.48);
  font-size: 0.72rem;
  font-weight: 950;
  text-transform: uppercase;
}

.editor-status.active {
  color: #065f46;
  background: rgba(16, 185, 129, 0.16);
  border-color: rgba(16, 185, 129, 0.36);
}

.editor-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.editor-actions button {
  min-height: 42px;
  padding: 0.58rem 0.72rem;
  border-radius: 999px;
}

.fen-preview {
  margin: 0;
  padding: 0.62rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255,255,255,0.55);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 760;
  line-height: 1.35;
  word-break: break-word;
}

.chess-board.editor-active .square {
  cursor: crosshair;
}

.chess-board.editor-active .square::after {
  content: "";
  position: absolute;
  inset: 8%;
  border: 2px dashed rgba(37, 99, 235, 0.28);
  border-radius: 10%;
  opacity: 0;
  pointer-events: none;
}

.chess-board.editor-active .square:hover::after,
.chess-board.editor-active .square:focus-visible::after {
  opacity: 1;
}

@media (max-width: 940px) {
  :root {
    --board-size: min(calc(100svw - max(0.12rem, env(safe-area-inset-left)) - max(0.12rem, env(safe-area-inset-right))), calc(100svh - 3.8rem), 980px);
  }
  .board-shell {
    padding: 2px;
    border-radius: 10px;
  }
  .chess-board {
    border-width: 2px;
    border-radius: 7px;
  }
}

@media (max-width: 560px) {
  :root {
    --board-size: min(calc(100svw - max(0.08rem, env(safe-area-inset-left)) - max(0.08rem, env(safe-area-inset-right))), calc(100svh - 4rem));
  }
  .evaluation-bar {
    left: 3px;
    top: 5px;
    bottom: 5px;
    width: 3px;
  }
  .editor-actions {
    grid-template-columns: 1fr;
  }
}

@media (prefers-color-scheme: dark) {
  .position-editor-card {
    background: rgba(23, 27, 35, 0.9);
  }
  .fen-preview, .editor-status {
    background: rgba(255, 255, 255, 0.06);
  }
  .editor-status.active {
    color: #86efac;
    background: rgba(16, 185, 129, 0.12);
  }
}

/* v2.4: vistas internas por herramienta */
.mode-nav {
  display: flex;
  gap: 0.45rem;
  margin: 0 0 0.75rem;
  padding: 0.35rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 250, 241, 0.72);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
}
.mode-tab {
  flex: 0 0 auto;
  min-height: 2.4rem;
  padding: 0.48rem 0.85rem;
  border-radius: 999px;
  font-size: 0.86rem;
  white-space: nowrap;
  background: transparent;
  color: var(--text);
  border-color: transparent;
}
.mode-tab.active,
.mode-tab[aria-pressed="true"] {
  background: #f8fafc;
  color: #111827;
  border-color: rgba(255, 255, 255, 0.88);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);
}
.tool-panel[hidden],
.board-tool[hidden] {
  display: none !important;
}
.side-panel {
  min-height: 0;
}
.game-layout[data-active-view="editor"] .side-panel,
.game-layout[data-active-view="analysis"] .side-panel,
.game-layout[data-active-view="practice"] .side-panel,
.game-layout[data-active-view="pgn"] .side-panel,
.game-layout[data-active-view="resources"] .side-panel,
.game-layout[data-active-view="online"] .side-panel {
  align-content: start;
}
.game-layout[data-active-view="editor"] .position-editor-card,
.game-layout[data-active-view="analysis"] .analysis-card,
.game-layout[data-active-view="practice"] .practice-card,
.game-layout[data-active-view="pgn"] .tools-card,
.game-layout[data-active-view="resources"] .resources-card,
.game-layout[data-active-view="online"] .online-card,
.game-layout[data-active-view="games"] .famous-games-card {
  border-color: rgba(37, 99, 235, 0.36);
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(37, 99, 235, 0.08);
}
.game-layout[data-active-view="editor"] {
  grid-template-columns: minmax(0, 1.08fr) minmax(340px, 460px);
}
.game-layout[data-active-view="analysis"] {
  grid-template-columns: minmax(0, 1.08fr) minmax(330px, 450px);
}
.game-layout[data-active-view="games"] {
  grid-template-columns: minmax(0, 1fr) minmax(330px, 450px);
}
.game-layout[data-active-view="pgn"] {
  grid-template-columns: minmax(0, 1fr) minmax(330px, 460px);
}
.game-layout[data-active-view="resources"] {
  grid-template-columns: minmax(0, 1fr) minmax(360px, 520px);
}
.game-layout[data-active-view="online"] {
  grid-template-columns: minmax(0, 1fr) minmax(360px, 520px);
}

@media (min-width: 941px) {
  .game-layout[data-active-view="editor"],
  .game-layout[data-active-view="analysis"],
  .game-layout[data-active-view="games"],
  .game-layout[data-active-view="practice"],
  .game-layout[data-active-view="bot"],
  .game-layout[data-active-view="pgn"],
  .game-layout[data-active-view="resources"],
  .game-layout[data-active-view="online"] {
    gap: 0.75rem;
  }
  .game-layout[data-active-view="editor"] .board-panel,
  .game-layout[data-active-view="analysis"] .board-panel,
  .game-layout[data-active-view="games"] .board-panel,
  .game-layout[data-active-view="practice"] .board-panel,
  .game-layout[data-active-view="pgn"] .board-panel,
  .game-layout[data-active-view="resources"] .board-panel,
  .game-layout[data-active-view="online"] .board-panel {
    top: max(0.35rem, env(safe-area-inset-top));
  }
}

@media (max-width: 940px) {
  .mode-nav {
    margin-bottom: 0.55rem;
    border-radius: 18px;
  }
  .mode-tab {
    min-height: 2.2rem;
    padding: 0.42rem 0.72rem;
    font-size: 0.8rem;
  }
  .game-layout,
  .game-layout[data-active-view="editor"],
  .game-layout[data-active-view="analysis"],
  .game-layout[data-active-view="games"],
  .game-layout[data-active-view="practice"],
  .game-layout[data-active-view="bot"],
  .game-layout[data-active-view="pgn"],
  .game-layout[data-active-view="resources"],
  .game-layout[data-active-view="online"] {
    grid-template-columns: 1fr;
  }
}

@media (prefers-color-scheme: dark) {
  .mode-nav {
    background: rgba(23, 27, 35, 0.9);
  }
  .mode-tab {
    color: var(--text);
  }
  .mode-tab.active,
  .mode-tab[aria-pressed="true"] {
    background: #f8fafc;
    color: #111827;
  }
}


/* v2.5: herramientas del tablero en panel derecho y paleta visual del editor */
.side-panel .side-board-tool {
  width: 100%;
  max-width: 100%;
  margin: 0;
}

.side-panel .material-panel {
  grid-template-columns: minmax(0, 1fr);
  align-items: stretch;
  gap: 0.55rem;
  padding: 0.72rem 0.82rem;
}

.side-panel .material-line,
.side-panel .material-line:last-child {
  text-align: left;
}

.side-panel .material-line:last-child .captured-list {
  justify-content: flex-start;
}

.side-panel .material-balance {
  order: -1;
  display: block;
  padding: 0.18rem 0 0.32rem;
  font-size: 1rem;
}

.side-panel .captured-list {
  min-height: 1.42rem;
  flex-wrap: wrap;
  overflow: visible;
}

.side-panel .captured-piece {
  width: 1.35rem;
  height: 1.35rem;
}

.side-panel .board-viewer-bar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 0.7rem;
  padding: 0.72rem 0.82rem;
}

.side-panel .board-viewer-bar .viewer-status {
  margin: 0;
  text-align: right;
  white-space: normal;
}

.game-layout[data-active-view="play"] .side-panel {
  align-content: start;
}

.visually-hidden-select {
  position: absolute !important;
  inline-size: 1px !important;
  block-size: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.editor-piece-palette {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.44rem;
}

.editor-piece-button {
  min-height: 3.15rem;
  padding: 0.2rem;
  border-radius: 14px;
  background: rgba(248, 250, 252, 0.94);
  color: #111827;
  border-color: rgba(255, 255, 255, 0.82);
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.08);
}

.editor-piece-button img {
  width: 100%;
  height: 2.45rem;
  display: block;
  object-fit: contain;
  pointer-events: none;
  filter: drop-shadow(0 2px 2px rgba(0,0,0,0.24));
}

.editor-piece-button.selected,
.editor-piece-button[aria-pressed="true"] {
  border-color: rgba(37, 99, 235, 0.92);
  box-shadow: inset 0 0 0 3px rgba(37, 99, 235, 0.22), 0 8px 18px rgba(37, 99, 235, 0.14);
}

.editor-piece-clear {
  grid-column: span 2;
  font-size: 0.82rem;
  font-weight: 950;
}

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

@media (min-width: 941px) {
  .game-layout[data-active-view="play"] {
    grid-template-columns: minmax(0, 1.12fr) minmax(330px, 420px);
  }

  .game-layout[data-active-view="editor"] .side-panel {
    max-width: 500px;
  }
}

@media (max-width: 940px) {
  .side-panel .board-viewer-bar {
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .side-panel .board-viewer-bar .viewer-status {
    text-align: center;
  }

  .editor-piece-palette {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .editor-piece-palette {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .editor-piece-button {
    min-height: 2.85rem;
  }

  .editor-piece-button img {
    height: 2.15rem;
  }
}

@media (prefers-color-scheme: dark) {
  .editor-piece-button {
    background: rgba(248, 250, 252, 0.96);
    color: #111827;
  }
}


/* v2.7: compartir posiciones creadas */
.editor-note-input {
  width: 100%;
  min-height: 4.7rem;
  resize: vertical;
  padding: 0.72rem 0.78rem;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.84);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  font-weight: 760;
  line-height: 1.35;
}

.editor-note-input::placeholder {
  color: rgba(71, 85, 105, 0.86);
}

.editor-share-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
}

.editor-share-actions button {
  min-height: 42px;
  padding: 0.58rem 0.72rem;
  border-radius: 999px;
}

.position-note-preview {
  margin: 0;
  padding: 0.62rem 0.7rem;
  border: 1px solid rgba(37, 99, 235, 0.22);
  border-radius: 14px;
  background: rgba(37, 99, 235, 0.08);
  color: #1e3a8a;
  font-size: 0.86rem;
  font-weight: 860;
  line-height: 1.35;
}

@media (max-width: 560px) {
  .editor-share-actions {
    grid-template-columns: 1fr;
  }
}

@media (prefers-color-scheme: dark) {
  .editor-note-input {
    background: rgba(15, 23, 42, 0.92);
    color: #f8fafc;
    border-color: rgba(148, 163, 184, 0.36);
  }

  .editor-note-input::placeholder {
    color: rgba(226, 232, 240, 0.74);
  }

  .position-note-preview {
    color: #bfdbfe;
    background: rgba(37, 99, 235, 0.18);
    border-color: rgba(96, 165, 250, 0.34);
  }
}



.game-layout[data-active-view="play"] .clock-card {
  order: -5;
}

.game-layout[data-active-view="play"] .history-card {
  order: -4;
}

.game-layout[data-active-view="play"] .move-history {
  max-height: min(30svh, 260px);
}

@media (min-width: 941px) {
  .game-layout[data-active-view="play"] .clock-card {
    position: sticky;
    top: max(0.35rem, env(safe-area-inset-top));
    z-index: 3;
  }
}

.clock-card {
  display: grid;
  gap: 0.75rem;
}

.clock-status {
  border-radius: 999px;
  padding: 0.22rem 0.55rem;
  background: rgba(15, 23, 42, 0.08);
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 800;
}

.clock-display {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem;
}

.clock-box {
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 1rem;
  padding: 0.65rem 0.7rem;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.clock-box span {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.clock-box strong {
  display: block;
  margin-top: 0.2rem;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.35rem, 4vw, 2rem);
  line-height: 1;
}

.clock-box.active {
  border-color: rgba(37, 99, 235, 0.45);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.13), inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.clock-box.expired {
  border-color: rgba(185, 28, 28, 0.5);
  background: rgba(254, 226, 226, 0.9);
}

.clock-settings {
  grid-template-columns: minmax(0, 1fr) minmax(4.5rem, 6rem);
}

.clock-settings input[hidden] {
  display: none;
}

.clock-actions {
  display: grid;
  grid-template-columns: 1fr 0.8fr 0.8fr;
  gap: 0.45rem;
}

.clock-actions button {
  min-height: 2.35rem;
  padding: 0.45rem 0.55rem;
}

@media (max-width: 720px) {
  .clock-actions {
    grid-template-columns: 1fr;
  }
}

@media (prefers-color-scheme: dark) {
  .clock-status {
    background: rgba(255, 255, 255, 0.08);
  }

  .clock-box {
    border-color: rgba(255, 255, 255, 0.14);
    background: rgba(15, 23, 42, 0.72);
  }

  .clock-box.expired {
    border-color: rgba(248, 113, 113, 0.55);
    background: rgba(127, 29, 29, 0.45);
  }
}


/* v2.10.2: vista Jugar optimizada — reloj/flechas visibles y controles compactos */
.game-layout[data-active-view="play"] .clock-card {
  order: -20;
}

.game-layout[data-active-view="play"] .board-viewer-bar {
  order: -19;
}

.game-layout[data-active-view="play"] #materialPanel {
  order: -18;
}

.game-layout[data-active-view="play"] .controls-card {
  order: -17;
  padding: 0.72rem 0.78rem;
}

.game-layout[data-active-view="play"] .history-card {
  order: -16;
}

.game-layout[data-active-view="play"] .controls-card h2,
.game-layout[data-active-view="play"] .history-card h2,
.game-layout[data-active-view="play"] .clock-card h2 {
  font-size: clamp(1rem, 1.7vw, 1.18rem);
}

.game-layout[data-active-view="play"] .controls-card .button-grid {
  gap: 0.45rem;
  margin-top: 0.55rem;
}

.game-layout[data-active-view="play"] .controls-card .button-grid button {
  min-height: 2.35rem;
  padding: 0.42rem 0.55rem;
  border-radius: 13px;
  font-size: clamp(0.78rem, 1.4vw, 0.9rem);
  line-height: 1.05;
}

.game-layout[data-active-view="play"] .controls-card .hint {
  margin-top: 0.48rem;
  font-size: 0.78rem;
  line-height: 1.28;
}

.game-layout[data-active-view="play"] .side-panel .board-viewer-bar {
  padding: 0.48rem 0.58rem;
  gap: 0.55rem;
}

.game-layout[data-active-view="play"] .side-panel .board-viewer-bar .viewer-status {
  font-size: 0.8rem;
}

.game-layout[data-active-view="play"] .side-panel .viewer-controls button {
  width: 2rem;
  min-width: 2rem;
  min-height: 1.9rem;
  font-size: 0.95rem;
}

.game-layout[data-active-view="play"] .side-panel #materialPanel {
  padding: 0.5rem 0.62rem;
  gap: 0.36rem;
}

.game-layout[data-active-view="play"] .side-panel .material-balance {
  font-size: 0.9rem;
  padding-bottom: 0.18rem;
}

.game-layout[data-active-view="play"] .side-panel .material-label {
  font-size: 0.58rem;
}

.game-layout[data-active-view="play"] .side-panel .captured-piece {
  width: 1.05rem;
  height: 1.05rem;
}

.game-layout[data-active-view="play"] .clock-card {
  gap: 0.5rem;
  padding: 0.72rem 0.78rem;
}

.game-layout[data-active-view="play"] .clock-display {
  gap: 0.45rem;
}

.game-layout[data-active-view="play"] .clock-box {
  padding: 0.48rem 0.55rem;
  border-radius: 0.82rem;
}

.game-layout[data-active-view="play"] .clock-box strong {
  font-size: clamp(1.18rem, 2.6vw, 1.65rem);
}

.game-layout[data-active-view="play"] .clock-settings {
  gap: 0.42rem;
}

.game-layout[data-active-view="play"] .clock-actions {
  gap: 0.34rem;
}

.game-layout[data-active-view="play"] .clock-actions button {
  min-height: 2.05rem;
  padding: 0.35rem 0.45rem;
  border-radius: 12px;
  font-size: 0.78rem;
}

.game-layout[data-active-view="play"] .clock-card label {
  font-size: 0.72rem;
  line-height: 1;
}

.game-layout[data-active-view="play"] .clock-card select,
.game-layout[data-active-view="play"] .clock-card input {
  min-height: 2.2rem;
  padding: 0.42rem 0.55rem;
  border-radius: 12px;
  font-size: 0.82rem;
}

.game-layout[data-active-view="play"] .compact-hint {
  display: none;
}

@media (min-width: 941px) {
  .game-layout[data-active-view="play"] {
    grid-template-columns: minmax(0, 1.18fr) minmax(300px, 390px);
    gap: 0.7rem;
  }

  .game-layout[data-active-view="play"] .side-panel {
    gap: 0.62rem;
    max-height: calc(100svh - max(1rem, env(safe-area-inset-top)) - 1rem);
    overflow-y: auto;
    overscroll-behavior: contain;
    padding-right: 0.15rem;
  }

  .game-layout[data-active-view="play"] .move-history {
    max-height: min(24svh, 220px);
  }
}

@media (max-width: 940px) {
  .game-layout[data-active-view="play"] .side-panel {
    gap: 0.55rem;
  }

  .game-layout[data-active-view="play"] .controls-card .hint {
    display: none;
  }

  .game-layout[data-active-view="play"] .controls-card .button-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .game-layout[data-active-view="play"] .controls-card .button-grid button {
    min-height: 2.15rem;
    font-size: 0.72rem;
    padding-inline: 0.35rem;
  }

  .game-layout[data-active-view="play"] .side-panel .board-viewer-bar {
    grid-template-columns: auto minmax(0, 1fr);
    justify-items: stretch;
  }

  .game-layout[data-active-view="play"] .side-panel .board-viewer-bar .viewer-status {
    text-align: right;
  }
}


/* v2.11.5: interacción táctil inmediata en tablero */
.collapsible-head {
  gap: 0.6rem;
}

.collapse-toggle {
  min-height: 1.9rem;
  padding: 0.28rem 0.58rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 950;
}

.collapsible-card.is-collapsed {
  padding-block: 0.56rem;
}

.collapsible-card.is-collapsed .collapsible-body {
  display: none;
}

.collapsible-card:not(.is-collapsed) .collapsible-body {
  display: block;
}

.game-layout[data-active-view="play"] .controls-card.is-collapsed {
  padding: 0.5rem 0.65rem;
}

.game-layout[data-active-view="play"] .controls-card.is-collapsed h2 {
  font-size: 0.98rem;
}

/* v2.11.6: controles de partida desplegables sobre el tablero */
.board-topbar {
  width: var(--board-size);
  max-width: 100%;
  margin: 0 auto 0.55rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 0.55rem;
}

.board-topbar .status-card {
  margin: 0;
  min-height: 2.35rem;
  display: flex;
  align-items: center;
}

.board-top-controls {
  position: relative;
  min-width: min(15rem, 44vw);
  padding: 0.5rem 0.6rem;
  box-shadow: none;
  z-index: 20;
}

.board-top-controls .collapsible-head {
  min-height: 2rem;
}

.board-top-controls .collapse-toggle {
  white-space: nowrap;
}

.board-top-controls:not(.is-collapsed) .collapsible-body {
  position: absolute;
  right: 0;
  top: calc(100% + 0.35rem);
  width: min(24rem, calc(100vw - 2rem));
  max-height: min(70svh, 34rem);
  overflow-y: auto;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(255, 250, 241, 0.98);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  overscroll-behavior: contain;
}

.board-top-controls .button-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.42rem;
}

.board-top-controls .button-grid button {
  min-height: 2.25rem;
  padding: 0.4rem 0.48rem;
  border-radius: 12px;
  font-size: 0.78rem;
  line-height: 1.05;
}

.board-clock-panel {
  margin-top: 0.7rem;
  padding: 0.68rem;
  box-shadow: none;
  background: rgba(15, 23, 42, 0.04);
}

.game-layout[data-active-view="play"] .board-top-controls.is-collapsed {
  padding: 0.46rem 0.58rem;
}

.game-layout[data-active-view="play"] .board-top-controls .hint {
  display: none;
}

.game-layout[data-active-view="play"] .board-top-controls .clock-card {
  position: static;
  top: auto;
  order: initial;
}

@media (max-width: 560px) {
  .board-topbar {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.38rem;
    margin-bottom: 0.4rem;
  }

  .board-topbar .status-card {
    min-height: 2.1rem;
    padding: 0.5rem 0.62rem;
    font-size: 0.86rem;
  }

  .board-top-controls {
    min-width: auto;
    padding: 0.42rem 0.48rem;
  }

  .board-top-controls .section-head {
    gap: 0.35rem;
  }

  .board-top-controls h2 {
    display: none;
  }

  .board-top-controls:not(.is-collapsed) .collapsible-body {
    right: 0;
    width: min(22rem, calc(100vw - 1rem));
  }
}

@media (prefers-color-scheme: dark) {
  .board-top-controls:not(.is-collapsed) .collapsible-body {
    background: rgba(23, 27, 35, 0.98);
  }

  .board-clock-panel {
    background: rgba(255, 255, 255, 0.05);
  }
}


/* v2.11.8: UX de ajedrez — barra compacta y menú flotante de acciones */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.game-layout[data-active-view="play"] .board-panel {
  justify-self: center;
}

.game-layout[data-active-view="play"] .board-topbar {
  align-items: center;
  grid-template-columns: minmax(0, 1fr) auto;
  margin-bottom: 0.42rem;
}

.game-layout[data-active-view="play"] .board-topbar .status-card {
  min-height: 2.2rem;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  box-shadow: none;
  font-size: clamp(0.86rem, 1.8vw, 1rem);
}

.game-layout[data-active-view="play"] .board-top-controls {
  min-width: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
}

.game-layout[data-active-view="play"] .board-top-controls.is-collapsed {
  padding: 0;
}

.game-layout[data-active-view="play"] .board-top-controls .section-head {
  display: flex;
  justify-content: flex-end;
}

.game-layout[data-active-view="play"] .board-top-controls .collapse-toggle {
  min-height: 2.2rem;
  padding: 0.48rem 0.82rem;
  border-radius: 999px;
  box-shadow: none;
}

.game-layout[data-active-view="play"] .board-top-controls:not(.is-collapsed) .collapsible-body {
  width: min(18rem, calc(100vw - 2rem));
  max-height: min(72svh, 28rem);
  padding: 0.5rem;
  border-radius: 16px;
}

.game-layout[data-active-view="play"] .board-top-controls .button-grid {
  grid-template-columns: 1fr;
  gap: 0.34rem;
  margin-top: 0;
}

.game-layout[data-active-view="play"] .board-top-controls .button-grid button {
  min-height: 2.35rem;
  justify-content: flex-start;
  padding: 0.48rem 0.68rem;
  border-radius: 12px;
  font-size: 0.82rem;
  text-align: left;
}

.game-layout[data-active-view="play"] .clock-card.clock-off {
  padding: 0.58rem 0.68rem;
  box-shadow: none;
}

.game-layout[data-active-view="play"] .clock-card.clock-off .clock-display,
.game-layout[data-active-view="play"] .clock-card.clock-off .clock-increment-label,
.game-layout[data-active-view="play"] .clock-card.clock-off .clock-increment-settings,
.game-layout[data-active-view="play"] .clock-card.clock-off #clockPauseBtn,
.game-layout[data-active-view="play"] .clock-card.clock-off #clockResetBtn,
.game-layout[data-active-view="play"] .clock-card.clock-off .compact-hint {
  display: none;
}

.game-layout[data-active-view="play"] .clock-card.clock-off .section-head {
  margin-bottom: 0.35rem;
}

.game-layout[data-active-view="play"] .clock-card.clock-off .clock-actions {
  grid-template-columns: 1fr;
}

.game-layout[data-active-view="play"] .clock-card.clock-off #clockToggleBtn:disabled {
  opacity: 0.46;
  cursor: default;
}

@media (max-width: 940px) {
  .game-layout[data-active-view="play"] {
    gap: 0.62rem;
  }

  .game-layout[data-active-view="play"] .side-panel {
    display: grid;
    grid-template-columns: 1fr;
    overflow-x: visible;
  }

  .game-layout[data-active-view="play"] .board-top-controls:not(.is-collapsed) .collapsible-body {
    right: 0;
    width: min(17rem, calc(100vw - 1rem));
  }

  .game-layout[data-active-view="play"] .history-card,
  .game-layout[data-active-view="play"] #materialPanel,
  .game-layout[data-active-view="play"] .board-viewer-bar,
  .game-layout[data-active-view="play"] .clock-card {
    box-shadow: none;
  }
}


/* v2.11.14: estabilidad de menús/paneles tras resultado y visibilidad de capturas */
.game-layout[data-active-view="play"] .board-topbar,
.game-layout[data-active-view="play"] .board-topbar .status-card {
  min-width: 0;
}

.game-layout[data-active-view="play"] .board-topbar .status-card {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.game-layout[data-active-view="play"] .board-top-controls {
  justify-self: end;
}

.game-layout[data-active-view="play"] .captured-list {
  gap: 0.12rem;
  min-height: 1.45rem;
}

.game-layout[data-active-view="play"] .captured-piece {
  box-sizing: border-box;
  padding: 1px;
  border: 1px solid rgba(15, 23, 42, 0.16);
  border-radius: 6px;
  background: rgba(248, 250, 252, 0.9);
}

@media (prefers-color-scheme: dark) {
  .game-layout[data-active-view="play"] .captured-piece {
    border-color: rgba(255, 255, 255, 0.18);
    background: rgba(248, 250, 252, 0.88);
  }
}


/* v2.11.17: menú Opciones fijado al viewport para que no se corte en iPad/Mac */
.game-layout[data-active-view="play"] .board-top-controls:not(.is-collapsed) .collapsible-body {
  position: fixed;
  left: var(--play-menu-left, max(0.5rem, env(safe-area-inset-left)));
  right: auto;
  top: var(--play-menu-top, max(3.25rem, env(safe-area-inset-top)));
  width: var(--play-menu-width, min(18rem, calc(100vw - 1rem)));
  max-width: calc(100vw - 1rem);
  max-height: min(72svh, 28rem);
  z-index: 1000;
  overflow: auto;
}

@media (max-width: 940px) {
  .game-layout[data-active-view="play"] .board-top-controls:not(.is-collapsed) .collapsible-body {
    left: var(--play-menu-left, max(0.5rem, env(safe-area-inset-left)));
    right: auto;
    width: var(--play-menu-width, min(17rem, calc(100vw - 1rem)));
  }
}


/* v2.11.18: tablero blindado frente al scroll en iPad/tablet */
:root {
  --board-lock-top: max(0.35rem, env(safe-area-inset-top));
}

.board-panel {
  top: var(--board-lock-top);
  will-change: transform;
  transform: translateZ(0);
}

.board-stage,
.board-shell,
.chess-board {
  overscroll-behavior: contain;
}

@media (pointer: coarse) {
  .board-stage,
  .board-shell,
  .chess-board {
    touch-action: none;
  }

  .board-panel {
    position: sticky;
    top: var(--board-lock-top);
    z-index: 8;
    max-height: calc(100svh - var(--board-lock-top));
    overflow: visible;
  }

  .side-panel {
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }
}

@media (pointer: coarse) and (orientation: landscape) and (min-width: 700px) {
  :root {
    --board-lock-top: max(0.18rem, env(safe-area-inset-top));
    --board-size: min(calc(100svw - 430px - 2rem), calc(100svh - 6.6rem), 980px);
  }

  .game-layout {
    align-items: start;
  }

  .side-panel {
    max-height: calc(100svh - var(--board-lock-top));
    overflow-y: auto;
  }
}

@media (pointer: coarse) and (orientation: portrait) and (min-width: 561px) {
  :root {
    --board-lock-top: max(0.25rem, env(safe-area-inset-top));
    --board-size: min(calc(100svw - max(0.18rem, env(safe-area-inset-left)) - max(0.18rem, env(safe-area-inset-right))), calc(100svh - 7.2rem), 860px);
  }
}

/* v2.11.19: navegación de partida siempre debajo del tablero */
.board-panel .board-bottom-viewer {
  width: var(--board-size);
  max-width: 100%;
  margin: 0.5rem auto 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 0.62rem;
  padding: 0.48rem 0.58rem;
  box-shadow: none;
  border-radius: 20px;
}

.board-panel .board-bottom-viewer .viewer-controls {
  justify-content: flex-start;
}

.board-panel .board-bottom-viewer .viewer-status {
  margin: 0;
  text-align: right;
  white-space: nowrap;
  font-size: 0.82rem;
}

.board-panel .board-bottom-viewer .viewer-controls button {
  width: 2rem;
  min-width: 2rem;
  min-height: 1.9rem;
  font-size: 0.95rem;
}

@media (max-width: 560px) {
  .board-panel .board-bottom-viewer {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 0.4rem;
  }

  .board-panel .board-bottom-viewer .viewer-status {
    text-align: center;
    white-space: normal;
  }
}

@media (pointer: coarse) and (orientation: landscape) and (min-width: 700px) {
  :root {
    --board-size: min(calc(100svw - 430px - 2rem), calc(100svh - 9.2rem), 980px);
  }
}


/* v2.11.21: Recursos de ajedrez */
.resources-card {
  align-content: start;
}

.resource-badge {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.12);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 900;
}

.resource-section {
  display: grid;
  gap: 0.55rem;
  padding: 0.72rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.035);
}

.resource-section h3 {
  margin: 0;
  font-size: 0.98rem;
}

.resource-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.42rem;
}

.resource-links a {
  display: flex;
  align-items: center;
  min-height: 2.25rem;
  padding: 0.48rem 0.62rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(248, 250, 252, 0.95);
  color: #111827;
  font-weight: 900;
  font-size: 0.78rem;
  line-height: 1.12;
  text-decoration: none;
}

.resource-links a:focus-visible,
.resource-links a:hover {
  border-color: rgba(37, 99, 235, 0.7);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.16);
}

.youtube-embed-form {
  grid-template-columns: minmax(0, 1fr) auto;
}

.youtube-embed-box {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #020617;
}

.youtube-embed-box iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

@media (max-width: 560px) {
  .resource-links,
  .youtube-embed-form {
    grid-template-columns: 1fr;
  }
}


/* v2.12.0: bienvenida inicial y cabecera discreta */
body.welcome-open {
  overflow: hidden;
}

.welcome-modal {
  position: fixed;
  inset: 0;
  z-index: 3000;
  display: grid;
  place-items: center;
  padding: max(1rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right)) max(1rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
  background:
    radial-gradient(circle at 50% 18%, rgba(181, 136, 99, 0.28), transparent 22rem),
    rgba(8, 12, 20, 0.78);
  backdrop-filter: blur(18px);
}

.welcome-modal[hidden] {
  display: none;
}

.welcome-card {
  width: min(560px, 100%);
  display: grid;
  gap: 0.82rem;
  padding: clamp(1.1rem, 3vw, 1.55rem);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 28px;
  background: rgba(17, 24, 39, 0.94);
  color: #f8fafc;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.42);
}

.welcome-version {
  margin: 0;
  color: rgba(248, 250, 252, 0.66);
  font-size: 0.72rem;
  font-weight: 950;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.welcome-card h2 {
  font-size: clamp(2.3rem, 9vw, 4.8rem);
  letter-spacing: -0.08em;
}

.welcome-lead {
  margin: 0;
  color: rgba(248, 250, 252, 0.86);
  font-size: clamp(1rem, 2.2vw, 1.16rem);
  font-weight: 750;
  line-height: 1.45;
}

.welcome-points {
  display: grid;
  gap: 0.46rem;
  margin: 0;
  padding-left: 1.1rem;
  color: rgba(248, 250, 252, 0.78);
  font-weight: 700;
  line-height: 1.38;
}

.welcome-enter {
  margin-top: 0.18rem;
  background: #f8fafc;
  color: #111827;
}


/* v2.12.0: interfaz Online gratuita */
.online-card {
  align-content: start;
}

.online-badge {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0.22rem 0.55rem;
  border-radius: 999px;
  background: rgba(16, 185, 129, 0.12);
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 900;
}

.online-mode-section {
  display: grid;
  gap: 0.55rem;
  padding: 0.72rem;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.035);
}

.online-mode-section h3 {
  margin: 0;
  font-size: 0.98rem;
}

.online-mode-section p,
.online-rules {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.online-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.42rem;
}

.online-actions button:disabled {
  cursor: not-allowed;
  opacity: 0.62;
}

.online-status {
  padding: 0.5rem 0.62rem;
  border-radius: 12px;
  background: rgba(37, 99, 235, 0.08);
  font-weight: 800;
}

.online-rules {
  padding-left: 1.1rem;
}

@media (max-width: 560px) {
  .online-actions {
    grid-template-columns: 1fr;
  }
}

/* v2.12.1: conexión visual de Online con Worker gratuito */
.online-actions-triple {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.online-invitations {
  display: grid;
  gap: 0.38rem;
}

.online-copy-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.42rem;
  align-items: center;
}

.online-copy-row input[readonly] {
  cursor: text;
}

.online-status.is-error {
  background: rgba(220, 38, 38, 0.12);
  color: #fecaca;
}

@media (max-width: 720px) {
  .online-actions-triple,
  .online-copy-row {
    grid-template-columns: 1fr;
  }
}

/* v2.12.2: Online más práctico y jugadas en directo */
.online-primary {
  border-color: rgba(37, 99, 235, 0.45);
  background: rgba(37, 99, 235, 0.045);
}

.online-steps {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.online-steps li + li {
  margin-top: 0.16rem;
}

.online-advanced summary {
  cursor: pointer;
  font-weight: 900;
}

.online-advanced[open] {
  background: rgba(255, 255, 255, 0.028);
}


/* v2.12.3: flujo Online más simple para crear o aceptar invitación */
.online-flow-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.online-actions-main {
  grid-template-columns: 1.2fr 1.2fr 0.8fr;
}

.online-actions-main button {
  min-height: 3.15rem;
}

.online-status-main {
  font-size: 0.9rem;
}

.online-generated-links {
  display: grid;
  gap: 0.45rem;
  padding-top: 0.15rem;
}

.online-generated-links summary,
.online-reconnect-btn {
  cursor: pointer;
  font-weight: 900;
}

.online-generated-links summary {
  color: var(--muted);
  font-size: 0.82rem;
}

.online-reconnect-btn {
  width: 100%;
}

@media (max-width: 720px) {
  .online-actions-main {
    grid-template-columns: 1fr;
  }
}


/* v2.12.4: Online minimalista */
.online-soon {
  opacity: 0.82;
}

.online-soon p {
  font-weight: 900;
}

.online-actions-main {
  grid-template-columns: 1fr 1fr auto;
}

@media (max-width: 720px) {
  .online-actions-main {
    grid-template-columns: 1fr;
  }
}

/* v2.12.5: correspondencia básica por enlace y orientación automática para negras */
.online-correspondence {
  border-color: rgba(16, 185, 129, 0.32);
  background: rgba(16, 185, 129, 0.04);
}

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

@media (max-width: 720px) {
  .online-actions-correspondence {
    grid-template-columns: 1fr;
  }
}

/* v2.12.7: ayuda online y elección de color del anfitrión */
.online-color-choice {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.5rem;
  align-items: center;
}

.online-color-choice select {
  min-height: 2.55rem;
}

.online-help-list {
  display: grid;
  gap: 0.22rem;
  margin-top: 0.1rem;
}

@media (max-width: 560px) {
  .online-color-choice {
    grid-template-columns: 1fr;
  }
}

/* v2.12.9: online persistente y aviso claro de color */
.online-role-status {
  font-weight: 900;
}

/* v2.12.11: elección clara de modo online y reloj online */
.online-clock-settings {
  display: grid;
  gap: 0.5rem;
}

.online-clock-settings input,
.online-clock-settings select {
  min-height: 2.55rem;
}

/* v2.12.11: popup de aceptación para invitaciones online */
.online-invite-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(4, 8, 18, 0.72);
  backdrop-filter: blur(10px);
}

.online-invite-modal[hidden] {
  display: none;
}

.online-invite-box {
  width: min(420px, 100%);
  border: 1px solid rgba(76, 111, 255, 0.5);
  border-radius: 24px;
  background: var(--panel-bg, #111827);
  color: var(--text-color, #f8fafc);
  padding: 1.25rem;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

.online-invite-box h2 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
}

.online-invite-box p {
  margin: 0 0 1rem;
  color: var(--muted-text, #b8c0d4);
  line-height: 1.45;
}

.online-invite-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.online-invite-actions button {
  min-height: 48px;
}

@media (max-width: 520px) {
  .online-invite-actions {
    grid-template-columns: 1fr;
  }
}

/* v2.12.16: reparación PWA/iPad — tablero prioritario en PWA landscape */
@media (pointer: coarse) and (orientation: landscape) and (min-width: 700px) {
  .game-layout[data-active-view="play"] {
    grid-template-columns: 1fr;
    gap: 0.62rem;
  }

  .game-layout[data-active-view="play"] .board-panel {
    justify-self: center;
  }

  .game-layout[data-active-view="play"] .side-panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
    gap: 0.7rem;
    max-height: none;
    overflow: visible;
  }

  .game-layout[data-active-view="play"] .clock-card,
  .game-layout[data-active-view="play"] .material-panel,
  .game-layout[data-active-view="play"] .history-card {
    max-width: 100%;
  }

  :root {
    --board-size: min(calc(100svw - 2rem), calc(100svh - 7rem), 860px);
  }
}


.bot-diagnostics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem 0.55rem;
  margin-top: 0.55rem;
  padding: 0.62rem 0.72rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.25;
}

.bot-diagnostics strong {
  grid-column: 1 / -1;
  color: var(--text);
  font-size: 0.82rem;
}

.bot-diagnostics span {
  min-width: 0;
  overflow-wrap: anywhere;
}

@media (max-width: 620px) {
  .bot-diagnostics {
    grid-template-columns: 1fr;
  }
}


/* v2.12.30: Bot compacto y signos visuales de calidad de jugada */
.bot-card .compact-form {
  gap: 0.42rem;
}

.bot-card select {
  min-height: 38px;
  padding: 0.48rem 0.72rem;
  border-radius: 12px;
  font-size: 0.88rem;
}

.bot-card .practice-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.42rem;
  margin-top: 0.52rem;
}

.bot-card .practice-actions button {
  min-height: 38px;
  padding: 0.44rem 0.7rem;
  border-radius: 999px;
  font-size: 0.86rem;
  line-height: 1.12;
}

.bot-card #analyzeBotGameBtn {
  grid-column: 1 / -1;
}

.move-quality {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  min-height: 1.38rem;
  padding: 0.12rem 0.42rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  background: rgba(148, 163, 184, 0.12);
  color: var(--muted);
  font-weight: 950;
  line-height: 1.05;
}

.move-quality b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.08rem;
  font-weight: 1000;
  letter-spacing: -0.02em;
}

.move-quality-brilliant { color: #8b5cf6; background: rgba(139, 92, 246, 0.14); border-color: rgba(139, 92, 246, 0.36); }
.move-quality-best { color: #22c55e; background: rgba(34, 197, 94, 0.14); border-color: rgba(34, 197, 94, 0.34); }
.move-quality-excellent { color: #16a34a; background: rgba(22, 163, 74, 0.14); border-color: rgba(22, 163, 74, 0.34); }
.move-quality-good { color: #2563eb; background: rgba(37, 99, 235, 0.13); border-color: rgba(37, 99, 235, 0.32); }
.move-quality-inaccuracy { color: #ca8a04; background: rgba(202, 138, 4, 0.15); border-color: rgba(202, 138, 4, 0.34); }
.move-quality-missed { color: #f97316; background: rgba(249, 115, 22, 0.15); border-color: rgba(249, 115, 22, 0.36); }
.move-quality-mistake { color: #dc2626; background: rgba(220, 38, 38, 0.14); border-color: rgba(220, 38, 38, 0.34); }
.move-quality-blunder { color: #b91c1c; background: rgba(185, 28, 28, 0.2); border-color: rgba(185, 28, 28, 0.44); }
.move-quality-pending { color: #64748b; background: rgba(100, 116, 139, 0.14); border-color: rgba(100, 116, 139, 0.28); }

@media (max-width: 620px) {
  .bot-card .practice-actions {
    grid-template-columns: 1fr;
  }
}

/* v2.12.30: Flecha persistente del último movimiento para revisar jugadas contra bot y resto de modos. */
.last-move-arrow {
  position: absolute;
  inset: 0;
  z-index: 5;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
}
.last-move-arrow line {
  stroke: rgba(255, 214, 77, 0.9);
  stroke-width: 2.9;
  stroke-linecap: round;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.38));
}
.last-move-arrow marker path {
  fill: rgba(255, 214, 77, 0.9);
}

/* v2.12.31: Modo Jugar limpio y flecha rápida estable en todos los tableros. */
.play-focus-exit {
  position: fixed;
  top: max(0.45rem, env(safe-area-inset-top));
  right: max(0.45rem, env(safe-area-inset-right));
  z-index: 1000;
  min-height: 34px;
  padding: 0.42rem 0.62rem;
  border-radius: 999px;
  border-color: rgba(255, 255, 255, 0.52);
  background: rgba(15, 23, 42, 0.82);
  color: #fffaf1;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(14px);
  font-size: 0.72rem;
  font-weight: 950;
}

body.play-focus-active {
  overflow: hidden;
  background: #17110b;
}

body.play-focus-active .app-shell {
  width: 100%;
  min-height: 100svh;
  padding: 0;
}

body.play-focus-active .topbar,
body.play-focus-active .mode-nav,
body.play-focus-active .side-panel,
body.play-focus-active .board-topbar,
body.play-focus-active .board-bottom-viewer,
body.play-focus-active .material-panel,
body.play-focus-active .evaluation-bar {
  display: none !important;
}

body.play-focus-active .game-layout,
body.play-focus-active .game-layout[data-active-view="play"] {
  display: grid;
  grid-template-columns: 1fr;
  width: 100vw;
  height: 100svh;
  min-height: 100svh;
  margin: 0;
  padding: max(0.42rem, env(safe-area-inset-top)) max(0.42rem, env(safe-area-inset-right)) max(0.42rem, env(safe-area-inset-bottom)) max(0.42rem, env(safe-area-inset-left));
  place-items: center;
  overflow: hidden;
}

body.play-focus-active .board-panel,
body.play-focus-active .game-layout[data-active-view="play"] .board-panel {
  position: static;
  inset: auto;
  z-index: 1;
  width: 100%;
  height: 100%;
  max-height: none;
  overflow: hidden;
  display: grid;
  place-items: center;
  justify-self: stretch;
  align-self: stretch;
  transform: none;
}

body.play-focus-active .board-stage {
  width: min(calc(100svw - max(0.84rem, env(safe-area-inset-left)) - max(0.84rem, env(safe-area-inset-right))), calc(100svh - max(0.84rem, env(safe-area-inset-top)) - max(0.84rem, env(safe-area-inset-bottom))));
  max-width: 100%;
  max-height: 100%;
  margin: 0 auto;
  overflow: hidden;
}

body.play-focus-active .board-shell {
  width: 100%;
  max-width: 100%;
  padding: clamp(2px, 0.55vmin, 8px);
  border-radius: clamp(9px, 2.2vmin, 22px);
  box-shadow: 0 14px 44px rgba(0, 0, 0, 0.42), inset 0 0 0 1px rgba(255,255,255,0.18);
}

body.play-focus-active .chess-board {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-width: clamp(2px, 0.55vmin, 6px);
  border-radius: clamp(7px, 1.55vmin, 18px);
}

body.play-focus-active .last-move-arrow line {
  stroke-width: 3.15;
}

@media (orientation: landscape) and (max-height: 520px) {
  body.play-focus-active .play-focus-exit {
    top: max(0.28rem, env(safe-area-inset-top));
    right: max(0.28rem, env(safe-area-inset-right));
    min-height: 30px;
    padding: 0.32rem 0.5rem;
    font-size: 0.66rem;
  }
}



/* v2.12.34: flechas de revisión visibles en todas las pantallas con tablero, incluido modo Jugar limpio. */
.board-bottom-viewer {
  display: flex;
}
.board-viewer-bar .viewer-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.42rem;
  flex: 0 0 auto;
}
.board-viewer-bar .viewer-controls button {
  min-width: 2.18rem;
  min-height: 2rem;
  padding: 0.28rem 0.48rem;
  border-radius: 0.72rem;
  font-size: 0.92rem;
  line-height: 1;
}
body.play-focus-active .board-bottom-viewer,
body.play-focus-active .game-layout[data-active-view="play"] .board-bottom-viewer {
  display: flex !important;
  position: fixed;
  left: 50%;
  bottom: max(0.42rem, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 980;
  width: min(92vw, 22rem);
  max-width: calc(100vw - 1rem);
  margin: 0;
  padding: 0.34rem 0.46rem;
  justify-content: center;
  align-items: center;
  gap: 0.42rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.20);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(14px);
}
body.play-focus-active .board-bottom-viewer .viewer-status {
  display: none;
}
body.play-focus-active .board-bottom-viewer .viewer-controls {
  width: 100%;
  justify-content: space-between;
  gap: 0.32rem;
}
body.play-focus-active .board-bottom-viewer .viewer-controls button {
  min-width: 2.18rem;
  min-height: 1.92rem;
  padding: 0.22rem 0.44rem;
  border-radius: 999px;
  font-size: 0.86rem;
  background: rgba(255, 255, 255, 0.92);
  color: #111827;
}
body.play-focus-active .board-stage {
  width: min(
    calc(100svw - max(0.84rem, env(safe-area-inset-left)) - max(0.84rem, env(safe-area-inset-right))),
    calc(100svh - 3.6rem - max(0.84rem, env(safe-area-inset-top)) - max(0.84rem, env(safe-area-inset-bottom)))
  );
}
@media (max-width: 520px) {
  .board-viewer-bar {
    width: min(var(--board-size), 100%);
    padding: 0.38rem 0.44rem;
    gap: 0.38rem;
  }
  .board-viewer-bar .viewer-status {
    font-size: 0.72rem;
  }
  .board-viewer-bar .viewer-controls button {
    min-width: 2rem;
    min-height: 1.86rem;
    padding: 0.2rem 0.38rem;
    font-size: 0.84rem;
  }
}

/* v2.12.35: en iPad/móvil, la barra de revisión del modo Jugar limpio queda debajo del tablero, sin pisarlo. */
@media (pointer: coarse) {
  body.play-focus-active .board-bottom-viewer,
  body.play-focus-active .game-layout[data-active-view="play"] .board-bottom-viewer {
    bottom: max(0.16rem, env(safe-area-inset-bottom));
  }

  body.play-focus-active .board-stage {
    width: min(
      calc(100svw - max(0.84rem, env(safe-area-inset-left)) - max(0.84rem, env(safe-area-inset-right))),
      calc(100svh - 5.15rem - max(0.84rem, env(safe-area-inset-top)) - max(0.84rem, env(safe-area-inset-bottom)))
    );
    transform: translateY(-0.42rem);
  }
}

@media (pointer: coarse) and (max-width: 560px) {
  body.play-focus-active .board-stage {
    width: min(
      calc(100svw - max(0.72rem, env(safe-area-inset-left)) - max(0.72rem, env(safe-area-inset-right))),
      calc(100svh - 5.55rem - max(0.72rem, env(safe-area-inset-top)) - max(0.72rem, env(safe-area-inset-bottom)))
    );
    transform: translateY(-0.36rem);
  }
}



/* v2.12.37: modo Jugar limpio en iPad/móvil sin scroll; tablero algo más pequeño para dejar sitio real a las flechas. */
@media (pointer: coarse) {
  html:has(body.play-focus-active),
  body.play-focus-active {
    width: 100%;
    height: 100dvh;
    min-height: 100dvh;
    max-height: 100dvh;
    overflow: hidden !important;
    overscroll-behavior: none;
  }

  body.play-focus-active {
    position: fixed;
    inset: 0;
  }

  body.play-focus-active .app-shell {
    height: 100dvh;
    min-height: 0;
    max-height: 100dvh;
    overflow: hidden;
  }

  body.play-focus-active .game-layout,
  body.play-focus-active .game-layout[data-active-view="play"] {
    height: 100dvh;
    min-height: 0;
    max-height: 100dvh;
    overflow: hidden;
    padding: max(0.34rem, env(safe-area-inset-top)) max(0.34rem, env(safe-area-inset-right)) max(0.34rem, env(safe-area-inset-bottom)) max(0.34rem, env(safe-area-inset-left));
  }

  body.play-focus-active .board-panel,
  body.play-focus-active .game-layout[data-active-view="play"] .board-panel {
    height: 100%;
    min-height: 0;
    max-height: 100%;
    overflow: hidden;
  }

  body.play-focus-active .board-stage {
    width: min(
      calc(100svw - max(1.05rem, env(safe-area-inset-left)) - max(1.05rem, env(safe-area-inset-right))),
      calc(100dvh - 6.85rem - max(0.9rem, env(safe-area-inset-top)) - max(0.9rem, env(safe-area-inset-bottom)))
    );
    max-width: calc(100svw - max(1.05rem, env(safe-area-inset-left)) - max(1.05rem, env(safe-area-inset-right)));
    max-height: calc(100dvh - 6.85rem - max(0.9rem, env(safe-area-inset-top)) - max(0.9rem, env(safe-area-inset-bottom)));
    transform: translateY(-0.82rem);
  }

  body.play-focus-active .board-bottom-viewer,
  body.play-focus-active .game-layout[data-active-view="play"] .board-bottom-viewer {
    bottom: max(0.42rem, env(safe-area-inset-bottom));
  }
}

@media (pointer: coarse) and (max-width: 560px) {
  body.play-focus-active .board-stage {
    width: min(
      calc(100svw - max(0.9rem, env(safe-area-inset-left)) - max(0.9rem, env(safe-area-inset-right))),
      calc(100dvh - 7.25rem - max(0.78rem, env(safe-area-inset-top)) - max(0.78rem, env(safe-area-inset-bottom)))
    );
    max-height: calc(100dvh - 7.25rem - max(0.78rem, env(safe-area-inset-top)) - max(0.78rem, env(safe-area-inset-bottom)));
    transform: translateY(-0.72rem);
  }
}


/* v2.12.37: separar el botón Menú del tablero en la pantalla limpia de Jugar. */
body.play-focus-active .play-focus-exit {
  top: max(0.42rem, env(safe-area-inset-top));
  right: max(0.42rem, env(safe-area-inset-right));
}

@media (pointer: coarse) {
  body.play-focus-active .board-stage {
    width: min(
      calc(100svw - max(1.1rem, env(safe-area-inset-left)) - max(1.1rem, env(safe-area-inset-right))),
      calc(100dvh - 8.2rem - max(1.05rem, env(safe-area-inset-top)) - max(1.05rem, env(safe-area-inset-bottom)))
    );
    max-width: calc(100svw - max(1.1rem, env(safe-area-inset-left)) - max(1.1rem, env(safe-area-inset-right)));
    max-height: calc(100dvh - 8.2rem - max(1.05rem, env(safe-area-inset-top)) - max(1.05rem, env(safe-area-inset-bottom)));
    transform: translateY(0);
  }

  body.play-focus-active .board-bottom-viewer,
  body.play-focus-active .game-layout[data-active-view="play"] .board-bottom-viewer {
    bottom: max(0.44rem, env(safe-area-inset-bottom));
  }
}

@media (pointer: coarse) and (max-width: 560px) {
  body.play-focus-active .board-stage {
    width: min(
      calc(100svw - max(0.92rem, env(safe-area-inset-left)) - max(0.92rem, env(safe-area-inset-right))),
      calc(100dvh - 8.65rem - max(0.9rem, env(safe-area-inset-top)) - max(0.9rem, env(safe-area-inset-bottom)))
    );
    max-height: calc(100dvh - 8.65rem - max(0.9rem, env(safe-area-inset-top)) - max(0.9rem, env(safe-area-inset-bottom)));
    transform: translateY(0);
  }
}


/* v2.12.38: el botón Menú sale definitivamente del tablero en la pantalla limpia de Jugar. */
body.play-focus-active .board-panel,
body.play-focus-active .game-layout[data-active-view="play"] .board-panel {
  grid-template-rows: auto minmax(0, auto) auto;
  align-content: center;
  justify-items: center;
  gap: clamp(0.42rem, 1.4dvh, 0.85rem);
}

body.play-focus-active .play-focus-exit {
  position: static !important;
  grid-row: 1;
  justify-self: end;
  align-self: end;
  margin: 0;
  transform: none !important;
  z-index: 20;
}

body.play-focus-active .board-stage {
  grid-row: 2;
}

body.play-focus-active .board-bottom-viewer,
body.play-focus-active .game-layout[data-active-view="play"] .board-bottom-viewer {
  grid-row: 3;
}

@media (pointer: coarse) {
  body.play-focus-active .board-panel,
  body.play-focus-active .game-layout[data-active-view="play"] .board-panel {
    gap: clamp(0.36rem, 1.15dvh, 0.72rem);
  }

  body.play-focus-active .play-focus-exit {
    min-height: 30px;
    padding: 0.32rem 0.58rem;
    font-size: 0.68rem;
  }

  body.play-focus-active .board-stage {
    width: min(
      calc(100svw - max(1.05rem, env(safe-area-inset-left)) - max(1.05rem, env(safe-area-inset-right))),
      calc(100dvh - 9.65rem - max(0.9rem, env(safe-area-inset-top)) - max(0.9rem, env(safe-area-inset-bottom)))
    );
    max-width: calc(100svw - max(1.05rem, env(safe-area-inset-left)) - max(1.05rem, env(safe-area-inset-right)));
    max-height: calc(100dvh - 9.65rem - max(0.9rem, env(safe-area-inset-top)) - max(0.9rem, env(safe-area-inset-bottom)));
    transform: none;
  }
}

@media (pointer: coarse) and (max-width: 560px) {
  body.play-focus-active .board-stage {
    width: min(
      calc(100svw - max(0.86rem, env(safe-area-inset-left)) - max(0.86rem, env(safe-area-inset-right))),
      calc(100dvh - 10.15rem - max(0.78rem, env(safe-area-inset-top)) - max(0.78rem, env(safe-area-inset-bottom)))
    );
    max-height: calc(100dvh - 10.15rem - max(0.78rem, env(safe-area-inset-top)) - max(0.78rem, env(safe-area-inset-bottom)));
  }
}

/* v2.12.43 - Aperturas con juego desde posición y turno correcto */
.openings-card {
  display: grid;
  gap: 0.75rem;
}

.opening-search,
.opening-select {
  width: 100%;
}

.opening-select {
  min-height: 2.65rem;
  font-weight: 800;
}

.openings-filter-row {
  grid-template-columns: 1fr auto;
}

.opening-list {
  display: grid;
  gap: 0.75rem;
  max-height: min(62vh, 720px);
  overflow: auto;
  padding-right: 0.25rem;
  -webkit-overflow-scrolling: touch;
}

.opening-detail-list {
  max-height: min(58vh, 680px);
}

.opening-item {
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 18px;
  padding: 0.85rem;
  background: rgba(15, 23, 42, 0.46);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.opening-detail-card {
  padding: 1rem;
}

.opening-item-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.65rem;
  margin-bottom: 0.45rem;
}

.opening-item h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.2;
}

.opening-eco {
  flex: 0 0 auto;
  max-width: 45%;
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 999px;
  padding: 0.2rem 0.5rem;
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--muted);
  text-align: right;
  letter-spacing: 0.03em;
}

.opening-moves {
  margin: 0.35rem 0 0.75rem;
  padding: 0.55rem 0.65rem;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.opening-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.opening-detail-block {
  border: 1px solid rgba(148, 163, 184, 0.16);
  border-radius: 14px;
  padding: 0.7rem;
  background: rgba(255, 255, 255, 0.045);
}

.opening-detail-block h4 {
  margin: 0 0 0.35rem;
  color: var(--text);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

.opening-detail-block p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.38;
}

.opening-turn-info {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin: 0.45rem 0 0;
  border: 1px solid rgba(125, 211, 252, 0.28);
  border-radius: 999px;
  padding: 0.3rem 0.65rem;
  background: rgba(14, 165, 233, 0.12);
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 800;
}

.opening-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.opening-actions button {
  width: auto;
  min-height: 2.35rem;
  padding: 0.45rem 0.9rem;
  font-size: 0.88rem;
}

@media (max-width: 760px) {
  .opening-list,
  .opening-detail-list {
    max-height: none;
  }

  .opening-item-head {
    display: grid;
  }

  .opening-eco {
    max-width: none;
    justify-self: start;
    text-align: left;
  }

  .openings-filter-row,
  .opening-detail-grid {
    grid-template-columns: 1fr;
  }
}


/* v2.12.42: clasificación manual de partida completa en Analizar. */
.analysis-classifier {
  display: grid;
  gap: 0.55rem;
  margin-top: 0.7rem;
  padding: 0.72rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel-soft);
}

.analysis-classifier h3 {
  margin: 0;
  font-size: 0.98rem;
}

.analysis-classifier-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.5rem;
}

.analysis-classifier-actions button {
  min-height: 38px;
  padding: 0.46rem 0.75rem;
  border-radius: 999px;
  font-size: 0.84rem;
}

.game-classification-output {
  display: grid;
  gap: 0.55rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
}

.game-classification-output p {
  margin: 0;
}

.game-classification-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
  align-items: center;
}

.game-classification-summary > span {
  display: inline-flex;
  gap: 0.24rem;
  align-items: center;
}

.game-classification-list {
  display: grid;
  gap: 0.4rem;
  max-height: min(42svh, 420px);
  margin: 0;
  padding: 0;
  overflow: auto;
  list-style: none;
}

.game-classification-row {
  display: grid;
  grid-template-columns: auto minmax(3.2rem, 0.7fr) minmax(8rem, 1fr);
  gap: 0.35rem 0.5rem;
  align-items: center;
  padding: 0.45rem 0.5rem;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.34);
}

.game-classification-row span:nth-child(n+4) {
  grid-column: 2 / -1;
}

.game-classification-ply {
  color: var(--muted);
  font-weight: 950;
}

.game-classification-move {
  color: var(--text);
  font-weight: 950;
}

@media (max-width: 620px) {
  .analysis-classifier-actions,
  .game-classification-row {
    grid-template-columns: 1fr;
  }

  .game-classification-row span:nth-child(n+4) {
    grid-column: auto;
  }
}