:root {
  color-scheme: dark;
  --bg: #0d1117;
  --bg-alt: #111825;
  --panel: #171f2e;
  --panel-2: #1a2336;
  --text: #f5f6f8;
  --muted: #a9b2c4;
  --line: rgba(255, 255, 255, 0.11);
  --accent: #ff8c42;
  --accent-soft: rgba(255, 140, 66, 0.25);
  --ok: #32d583;
  --warn: #f7b500;
  --danger: #ff5a5f;
  --radius: 14px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);

  --bg-glow-a: rgba(255, 140, 66, 0.12);
  --bg-glow-b: rgba(0, 173, 181, 0.12);
  --hero-bg: linear-gradient(145deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));

  --kicker: #f8be8a;
  --sync-connected: #a4f2cb;
  --sync-error: #ffb8bc;
  --input-bg: rgba(8, 12, 20, 0.65);
  --button-bg: rgba(255, 255, 255, 0.02);
  --button-hover-border: rgba(255, 140, 66, 0.55);
  --button-hover-ring: rgba(255, 140, 66, 0.12);
  --piece-chip-bg: rgba(255, 255, 255, 0.03);
  --score: #ffcd87;
  --move-num: #7582a4;
  --move-w: #f9fafb;
  --account-strong: #f6d9b8;
  --range-strong: #f6d9b8;
  --analysis-locked: #9fb0cc;
  --recent-title: #f6e6d8;
  --promotion-overlay-bg: rgba(4, 8, 16, 0.7);

  --arena-overlay: linear-gradient(180deg, rgba(10, 18, 34, 0.15), rgba(10, 18, 34, 0.62));
  --arena-card-bg: rgba(9, 20, 38, 0.92);
  --arena-head: #9aeccd;
  --arena-text: #c7d5eb;

  --eval-track-border: rgba(255, 255, 255, 0.16);
  --eval-track-bg: rgba(255, 255, 255, 0.05);
  --eval-track-inset: rgba(10, 17, 31, 0.35);
  --eval-black-start: #080d15;
  --eval-black-end: #1d2431;
  --eval-white-start: #f4f8ff;
  --eval-white-end: #d2dbeb;
  --eval-readout-dark: #f7f8ff;
  --eval-readout-dark-shadow: rgba(0, 0, 0, 0.68);
  --eval-readout-light: #0f1522;
  --eval-readout-light-shadow: rgba(255, 255, 255, 0.78);
}

:root[data-theme='light'] {
  color-scheme: light;
  --bg: #eef2f8;
  --bg-alt: #f4f8fd;
  --panel: #ffffff;
  --panel-2: #eef3fb;
  --text: #182130;
  --muted: #5b6b84;
  --line: rgba(19, 42, 76, 0.16);
  --shadow: 0 20px 60px rgba(38, 55, 90, 0.15);

  --bg-glow-a: rgba(255, 140, 66, 0.18);
  --bg-glow-b: rgba(0, 122, 190, 0.14);
  --hero-bg: linear-gradient(145deg, rgba(255, 255, 255, 0.95), rgba(233, 240, 250, 0.9));

  --kicker: #a24f1d;
  --sync-connected: #147a49;
  --sync-error: #ad2430;
  --input-bg: rgba(247, 250, 255, 0.98);
  --button-bg: rgba(255, 255, 255, 0.92);
  --button-hover-border: rgba(255, 140, 66, 0.68);
  --button-hover-ring: rgba(255, 140, 66, 0.2);
  --piece-chip-bg: rgba(20, 40, 70, 0.04);
  --score: #a85a1b;
  --move-num: #63748d;
  --move-w: #111a29;
  --account-strong: #7a3f18;
  --range-strong: #7a3f18;
  --analysis-locked: #4e607a;
  --recent-title: #1f2b40;
  --promotion-overlay-bg: rgba(15, 22, 36, 0.46);

  --arena-overlay: linear-gradient(180deg, rgba(220, 230, 244, 0.35), rgba(180, 194, 215, 0.76));
  --arena-card-bg: rgba(247, 251, 255, 0.96);
  --arena-head: #1b7a5c;
  --arena-text: #425876;

  --eval-track-border: rgba(19, 42, 76, 0.23);
  --eval-track-bg: rgba(19, 42, 76, 0.08);
  --eval-track-inset: rgba(255, 255, 255, 0.66);
  --eval-black-start: #151c2a;
  --eval-black-end: #2f3a4c;
  --eval-white-start: #ffffff;
  --eval-white-end: #e2e9f5;
  --eval-readout-dark: #f7f8ff;
  --eval-readout-dark-shadow: rgba(0, 0, 0, 0.66);
  --eval-readout-light: #0f1522;
  --eval-readout-light-shadow: rgba(255, 255, 255, 0.8);
}
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Space Grotesk', system-ui, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 12% -10%, var(--bg-glow-a), transparent 60%),
    radial-gradient(900px 450px at 95% 110%, var(--bg-glow-b), transparent 50%),
    var(--bg);
  min-height: 100vh;
}

body.modal-open {
  overflow: hidden;
}

.app-shell {
  width: min(1260px, 100%);
  margin: 0 auto;
  padding: 24px 12px 32px;
}

.app-shell.app-shell-inert {
  pointer-events: none;
  user-select: none;
}

.hero {
  margin-bottom: 20px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--hero-bg);
  box-shadow: var(--shadow);
}

.kicker {
  margin: 0;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--kicker);
}

.hero h1 {
  margin: 6px 0 4px;
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1;
}

.hero-sub {
  margin: 0;
  color: var(--muted);
  max-width: 72ch;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 780px) minmax(300px, 420px);
  gap: 18px;
  align-items: start;
}

.settings-layout {
  max-width: 760px;
  margin: 0 auto;
}

.top-actions {
  margin-top: 12px;
}

.board-panel,
.control-panel {
  display: grid;
  gap: 14px;
}

.status-card,
.card,
.move-panel,
.captured-box,
.board-frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--panel), var(--panel-2));
  box-shadow: var(--shadow);
}

.status-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  font-weight: 600;
}

.status-card.is-check {
  border-color: rgba(247, 181, 0, 0.45);
}

.status-card.is-checkmate {
  border-color: rgba(255, 90, 95, 0.52);
}

.status-card.is-draw {
  border-color: rgba(50, 213, 131, 0.45);
}

.turn-dot {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  border: 2px solid var(--line);
  flex-shrink: 0;
}

.turn-dot.white {
  background: #f3eee5;
}

.turn-dot.black {
  background: #222831;
}

.sync-pill {
  margin-left: auto;
  font-size: 0.75rem;
  padding: 4px 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
}

.sync-pill.connected {
  border-color: rgba(50, 213, 131, 0.35);
  color: var(--sync-connected);
}

.sync-pill.error {
  border-color: rgba(255, 90, 95, 0.45);
  color: var(--sync-error);
}

.board-frame {
  position: relative;
  padding: 14px;
}

.arena-cleaner {
  position: absolute;
  inset: 14px;
  display: none;
  align-items: flex-end;
  justify-content: center;
  background: var(--arena-overlay);
  border-radius: 12px;
  z-index: 8;
  pointer-events: none;
}

.arena-cleaner.open {
  display: flex;
}

.arena-cleaner-card {
  width: min(420px, calc(100% - 18px));
  margin-bottom: 12px;
  padding: 10px 12px;
  border: 1px solid rgba(80, 214, 170, 0.4);
  border-radius: 10px;
  background: var(--arena-card-bg);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.34);
}

.arena-cleaner-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--arena-head);
}

.bot-indicator {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #4ce1a7;
  box-shadow: 0 0 0 0 rgba(76, 225, 167, 0.5);
  animation: bot-pulse 1.2s ease-in-out infinite;
}

.arena-cleaner-track {
  margin-top: 8px;
  width: 100%;
  height: 9px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.arena-cleaner-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, #32d583, #87f4c7);
  box-shadow: 0 0 12px rgba(76, 225, 167, 0.48);
  transition: width 220ms linear;
}

.arena-cleaner-text {
  margin-top: 6px;
  font-size: 0.74rem;
  color: var(--arena-text);
}

@keyframes bot-pulse {
  0% {
    transform: scale(0.9);
    box-shadow: 0 0 0 0 rgba(76, 225, 167, 0.45);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 7px rgba(76, 225, 167, 0);
  }
  100% {
    transform: scale(0.9);
    box-shadow: 0 0 0 0 rgba(76, 225, 167, 0);
  }
}

.board-arena {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 10px;
  max-width: 654px;
  margin: 0 auto;
}

.eval-column {
  width: 24px;
  flex: 0 0 24px;
  display: flex;
}

.eval-column.hidden {
  display: none;
}

.eval-track {
  position: relative;
  width: 100%;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--eval-track-border);
  background: var(--eval-track-bg);
  box-shadow: inset 0 0 0 1px var(--eval-track-inset);
}

.eval-fill {
  width: 100%;
  transition: height 220ms ease;
}

.eval-fill-black {
  height: 50%;
  background: linear-gradient(180deg, var(--eval-black-start), var(--eval-black-end));
}

.eval-fill-white {
  height: 50%;
  background: linear-gradient(180deg, var(--eval-white-start), var(--eval-white-end));
}

.eval-readout {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) rotate(-90deg);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--eval-readout-dark);
  text-shadow: 0 1px 2px var(--eval-readout-dark-shadow);
  white-space: nowrap;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.eval-readout.on-dark {
  color: var(--eval-readout-dark);
  text-shadow: 0 1px 2px var(--eval-readout-dark-shadow);
}

.eval-readout.on-light {
  color: var(--eval-readout-light);
  text-shadow: 0 1px 2px var(--eval-readout-light-shadow);
}

.eval-track.loading .eval-readout {
  opacity: 0.62;
}

.eval-track.loading::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 20%, rgba(255, 255, 255, 0.24) 50%, transparent 80%);
  animation: eval-scan 1.15s linear infinite;
  pointer-events: none;
}

@keyframes eval-scan {
  0% {
    transform: translateY(-100%);
  }
  100% {
    transform: translateY(100%);
  }
}

.board-stage {
  flex: 1 1 auto;
  max-width: 620px;
  min-width: 0;
}

.board-shell {
  width: 100%;
  aspect-ratio: 1;
  margin: 0;
  border-radius: 12px;
  overflow: hidden;
}

.board-shell piece {
  transition: filter 180ms ease, transform 180ms ease;
  background-repeat: no-repeat;
  background-position: center center;
  background-size: contain;
}

.board-shell[data-piece-style='2d'] piece {
  filter: drop-shadow(0 2px 3px rgba(0, 0, 0, 0.33));
  transform: scale(0.96);
}

.board-shell[data-piece-style='3d'] piece {
  /* Lichess 3D sprites are 360x460; preserve that ratio to prevent flattened pieces. */
  filter: drop-shadow(0 3px 5px rgba(0, 0, 0, 0.35));
  background-size: auto 94%;
  background-position: 53% 44%;
}

.board-shell[data-piece-style='3d'] piece.pawn {
  background-position: 53% 40%;
}

.board-shell[data-piece-style='3d'] piece.rook,
.board-shell[data-piece-style='3d'] piece.bishop {
  background-position: 53% 42%;
}

.board-shell[data-piece-style='3d'] piece.knight {
  background-position: 53% 44%;
}

.board-shell[data-piece-style='3d'] piece.queen {
  background-position: 53% 47%;
}

.board-shell[data-piece-style='3d'] piece.king {
  background-position: 53% 50%;
}

.board-shell[data-board-style='brown'] cg-board {
  background-image: url('./assets/boards/brown.png');
}

.board-shell[data-board-style='wood'] cg-board {
  background-image: url('./assets/boards/wood.jpg');
}

.board-shell[data-board-style='blue'] cg-board {
  background-image: url('./assets/boards/blue.png');
}

.board-shell[data-piece-style='2d'] piece.pawn.white { background-image: url('./assets/pieces/2d/cburnett/wP.svg'); }
.board-shell[data-piece-style='2d'] piece.knight.white { background-image: url('./assets/pieces/2d/cburnett/wN.svg'); }
.board-shell[data-piece-style='2d'] piece.bishop.white { background-image: url('./assets/pieces/2d/cburnett/wB.svg'); }
.board-shell[data-piece-style='2d'] piece.rook.white { background-image: url('./assets/pieces/2d/cburnett/wR.svg'); }
.board-shell[data-piece-style='2d'] piece.queen.white { background-image: url('./assets/pieces/2d/cburnett/wQ.svg'); }
.board-shell[data-piece-style='2d'] piece.king.white { background-image: url('./assets/pieces/2d/cburnett/wK.svg'); }
.board-shell[data-piece-style='2d'] piece.pawn.black { background-image: url('./assets/pieces/2d/cburnett/bP.svg'); }
.board-shell[data-piece-style='2d'] piece.knight.black { background-image: url('./assets/pieces/2d/cburnett/bN.svg'); }
.board-shell[data-piece-style='2d'] piece.bishop.black { background-image: url('./assets/pieces/2d/cburnett/bB.svg'); }
.board-shell[data-piece-style='2d'] piece.rook.black { background-image: url('./assets/pieces/2d/cburnett/bR.svg'); }
.board-shell[data-piece-style='2d'] piece.queen.black { background-image: url('./assets/pieces/2d/cburnett/bQ.svg'); }
.board-shell[data-piece-style='2d'] piece.king.black { background-image: url('./assets/pieces/2d/cburnett/bK.svg'); }

.board-shell[data-piece-style='3d'] piece.pawn.white { background-image: url('./assets/pieces/3d/staunton-basic/White-Pawn.png'); }
.board-shell[data-piece-style='3d'] piece.knight.white { background-image: url('./assets/pieces/3d/staunton-basic/White-Knight.png'); }
.board-shell[data-piece-style='3d'] piece.bishop.white { background-image: url('./assets/pieces/3d/staunton-basic/White-Bishop.png'); }
.board-shell[data-piece-style='3d'] piece.rook.white { background-image: url('./assets/pieces/3d/staunton-basic/White-Rook.png'); }
.board-shell[data-piece-style='3d'] piece.queen.white { background-image: url('./assets/pieces/3d/staunton-basic/White-Queen.png'); }
.board-shell[data-piece-style='3d'] piece.king.white { background-image: url('./assets/pieces/3d/staunton-basic/White-King.png'); }
.board-shell[data-piece-style='3d'] piece.pawn.black { background-image: url('./assets/pieces/3d/staunton-basic/Black-Pawn.png'); }
.board-shell[data-piece-style='3d'] piece.knight.black { background-image: url('./assets/pieces/3d/staunton-basic/Black-Knight.png'); }
.board-shell[data-piece-style='3d'] piece.bishop.black { background-image: url('./assets/pieces/3d/staunton-basic/Black-Bishop.png'); }
.board-shell[data-piece-style='3d'] piece.rook.black { background-image: url('./assets/pieces/3d/staunton-basic/Black-Rook.png'); }
.board-shell[data-piece-style='3d'] piece.queen.black { background-image: url('./assets/pieces/3d/staunton-basic/Black-Queen.png'); }
.board-shell[data-piece-style='3d'] piece.king.black { background-image: url('./assets/pieces/3d/staunton-basic/Black-King.png'); }

cg-board square.move-dest {
  background: radial-gradient(rgba(20, 85, 30, 0.45) 20%, rgba(20, 85, 30, 0.02) 21%);
}

cg-board square.oc.move-dest {
  background: radial-gradient(transparent 58%, rgba(20, 85, 30, 0.3) 62%);
}

cg-board square.last-move {
  background-color: rgba(255, 191, 105, 0.4);
}

cg-board square.selected {
  background-color: rgba(255, 140, 66, 0.35);
}

cg-board square.check {
  background: radial-gradient(circle, rgba(255, 90, 95, 0.88), rgba(255, 90, 95, 0) 78%);
}

.captured-wrap {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.captured-box {
  padding: 10px 12px;
}

.captured-box h3 {
  margin: 0 0 8px;
  font-size: 0.9rem;
}

.captured-list {
  min-height: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  color: var(--muted);
}

.piece-chip {
  font-size: 0.8rem;
  padding: 2px 6px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--piece-chip-bg);
}

.score-row {
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--score);
}

.move-panel {
  padding: 10px 12px;
}

.move-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.move-header h3 {
  margin: 0;
  font-size: 0.95rem;
}

.analysis-nav-controls {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.analysis-nav-btn {
  min-width: 44px;
  padding: 4px 10px;
  text-align: center;
}

.move-list {
  max-height: 170px;
  overflow-y: auto;
  display: grid;
  gap: 4px;
  padding-right: 4px;
}

.move-row {
  display: grid;
  grid-template-columns: 32px 1fr 1fr;
  gap: 8px;
  font-size: 0.83rem;
  color: var(--muted);
}

.move-row .num {
  color: var(--move-num);
}

.move-row .w {
  color: var(--move-w);
}

.control-panel .card {
  padding: 12px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.account-meta {
  display: grid;
  gap: 7px;
  margin-top: 6px;
}

.account-meta .meta-label {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  margin-bottom: 2px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.account-meta strong {
  font-size: 0.92rem;
  color: var(--account-strong);
}

.card h3.subhead {
  margin: 12px 0 8px;
  font-size: 0.86rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.hint {
  margin: 0 0 10px;
  font-size: 0.84rem;
  color: var(--muted);
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

label {
  display: grid;
  gap: 5px;
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 8px;
}

input,
select,
button {
  font: inherit;
}

input,
select {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  padding: 9px 10px;
  background: var(--input-bg);
  color: var(--text);
}

input::placeholder {
  color: var(--muted);
  opacity: 0.84;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.btn,
.ghost-btn {
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--button-bg);
  color: var(--text);
  padding: 8px 12px;
  cursor: pointer;
  transition: 0.18s ease;
}

.btn.link-btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.btn:hover,
.ghost-btn:hover {
  border-color: var(--button-hover-border);
  box-shadow: 0 0 0 3px var(--button-hover-ring);
}

.btn:disabled,
.ghost-btn:disabled {
  cursor: not-allowed;
  opacity: 0.58;
  box-shadow: none;
  border-color: var(--line);
}

.btn-primary {
  background: linear-gradient(135deg, #ff8c42, #ffae52);
  color: #1c1307;
  border-color: rgba(255, 177, 94, 0.7);
  font-weight: 600;
}

.ghost-btn {
  padding: 4px 8px;
  font-size: 0.75rem;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}

.toggle-row input {
  width: 16px;
  height: 16px;
  margin: 0;
}

.cloud-status {
  margin-top: 10px;
  padding: 8px 10px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  font-size: 0.8rem;
  color: var(--muted);
  background: var(--button-bg);
}

.cloud-status.ok {
  border-color: rgba(50, 213, 131, 0.45);
  color: var(--sync-connected);
}

.cloud-status.error {
  border-color: rgba(255, 90, 95, 0.45);
  color: var(--sync-error);
}

.bot-action-card {
  display: grid;
}

.bot-launch-btn {
  width: 100%;
  justify-content: center;
  padding: 10px 14px;
  font-size: 0.95rem;
}

.bot-overlay {
  position: fixed;
  inset: 0;
  display: none;
  place-items: center;
  z-index: 998;
  padding: 14px;
  background: rgba(7, 12, 20, 0.66);
  backdrop-filter: blur(2px);
}

.bot-overlay.open {
  display: grid;
}

.bot-dialog {
  width: min(560px, 95vw);
  border-radius: 16px;
  border: 1px solid var(--line);
  background: linear-gradient(168deg, var(--panel), var(--panel-2));
  box-shadow: var(--shadow);
  padding: 14px;
}

.bot-dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 6px;
}

.bot-dialog-head h3 {
  margin: 0;
  font-size: 1rem;
}

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

.bot-mode-group {
  border: 1px solid var(--line);
  border-radius: 12px;
  margin: 10px 0 0;
  padding: 10px;
  display: grid;
  gap: 8px;
  background: var(--button-bg);
}

.bot-mode-group legend {
  padding: 0 6px;
  color: var(--muted);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.radio-row {
  margin-top: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 0.82rem;
}

.radio-row input {
  width: 16px;
  height: 16px;
  margin: 0;
}

.bot-elo-field {
  margin-top: 10px;
}

.elo-slider-wrap {
  position: relative;
  --elo-slider-pct: 50%;
  padding-bottom: 22px;
}

.elo-slider-wrap input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 30px;
  border: 0;
  border-radius: 0;
  background: transparent;
  padding: 0;
  margin: 0;
}

.elo-slider-wrap input[type='range']::-webkit-slider-runnable-track {
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(255, 174, 82, 0.86), rgba(255, 255, 255, 0.72));
}

.elo-slider-wrap input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  margin-top: -7px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.64);
  background: linear-gradient(145deg, #ff9044, #ffc270);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
}

.elo-slider-wrap input[type='range']::-moz-range-track {
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(255, 174, 82, 0.86), rgba(255, 255, 255, 0.72));
}

.elo-slider-wrap input[type='range']::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.64);
  background: linear-gradient(145deg, #ff9044, #ffc270);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
}

.elo-slider-wrap input[type='range']:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.elo-slider-badge {
  position: absolute;
  left: var(--elo-slider-pct);
  bottom: 0;
  transform: translateX(-50%);
  min-width: 48px;
  text-align: center;
  font-size: 0.76rem;
  line-height: 1;
  color: var(--range-strong);
}

.bot-elo-field .range-meta {
  justify-content: flex-start;
}

.bot-note {
  margin: 8px 0 0;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 0.76rem;
  color: var(--muted);
  background: var(--button-bg);
}

.bot-note.locked {
  border-color: rgba(247, 181, 0, 0.45);
  color: var(--warn);
}

#btn-start-stockfish {
  width: 100%;
}
.engine-grid {
  align-items: end;
}

.range-meta {
  margin-top: 5px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.74rem;
  color: var(--muted);
}

.range-meta strong {
  color: var(--range-strong);
  font-size: 0.83rem;
}

.engine-status {
  margin-top: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 0.78rem;
  color: var(--muted);
  background: var(--button-bg);
}

.engine-status.ok {
  border-color: rgba(50, 213, 131, 0.45);
  color: var(--sync-connected);
}

.engine-status.warn {
  border-color: rgba(247, 181, 0, 0.45);
  color: var(--warn);
}

.engine-status.error {
  border-color: rgba(255, 90, 95, 0.45);
  color: var(--sync-error);
}

.analysis-summary {
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--muted);
}

.analysis-list {
  margin-top: 8px;
  max-height: 240px;
  overflow-y: auto;
  display: grid;
  gap: 6px;
}

.analysis-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--button-bg);
  padding: 8px;
  display: grid;
  gap: 4px;
}

.analysis-item.locked {
  border-style: dashed;
  color: var(--analysis-locked);
  font-size: 0.8rem;
}

.analysis-item-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.analysis-move-btn {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.analysis-move-btn:hover:not(:disabled),
.analysis-move-btn:focus-visible {
  color: var(--move-w);
  text-decoration: underline;
}

.analysis-move-btn.active {
  color: var(--move-w);
  text-decoration: underline;
}

.analysis-move-btn:disabled {
  cursor: not-allowed;
  opacity: 0.72;
  text-decoration: none;
}

.analysis-item-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  color: var(--muted);
}

.analysis-badge {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 1px 7px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.analysis-badge.best,
.analysis-badge.good {
  border-color: rgba(50, 213, 131, 0.4);
  color: var(--sync-connected);
}

.analysis-badge.inaccuracy {
  border-color: rgba(247, 181, 0, 0.45);
  color: var(--warn);
}

.analysis-badge.mistake,
.analysis-badge.blunder {
  border-color: rgba(255, 90, 95, 0.45);
  color: var(--sync-error);
}

.analysis-best {
  font-size: 0.76rem;
  color: var(--muted);
}

.recent-list {
  display: grid;
  gap: 6px;
  max-height: 180px;
  overflow-y: auto;
}

.recent-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--button-bg);
  padding: 8px;
  display: grid;
  gap: 4px;
}

.recent-item-title {
  font-size: 0.82rem;
  color: var(--recent-title);
}

.recent-item-meta {
  font-size: 0.72rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
}

.recent-item button {
  justify-self: start;
}

.promotion-overlay {
  position: fixed;
  inset: 0;
  background: var(--promotion-overlay-bg);
  backdrop-filter: blur(2px);
  display: none;
  place-items: center;
  z-index: 999;
  padding: 14px;
}

.promotion-overlay.open {
  display: grid;
}

.promotion-dialog {
  width: min(460px, 95vw);
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(160deg, var(--panel), var(--panel-2));
  box-shadow: var(--shadow);
  padding: 14px;
}

.promotion-dialog h3 {
  margin: 0;
  font-size: 1rem;
}

.promotion-dialog p {
  margin: 6px 0 12px;
  color: var(--muted);
  font-size: 0.85rem;
}

.promotion-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 8px;
}

.promotion-btn {
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--piece-chip-bg);
  color: var(--text);
  padding: 10px 11px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.promotion-btn:hover {
  border-color: var(--button-hover-border);
  box-shadow: 0 0 0 3px var(--button-hover-ring);
}

.promotion-piece-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  filter: drop-shadow(0 3px 5px rgba(0, 0, 0, 0.35));
}

@media (max-width: 1200px) {
  .layout {
    grid-template-columns: minmax(300px, 1fr) minmax(290px, 360px);
  }
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .board-shell {
    width: min(100%, 620px);
  }
}

@media (max-width: 620px) {
  .app-shell {
    padding: 12px 8px 20px;
  }

  .hero {
    padding: 14px;
  }

  .hero h1 {
    line-height: 1.06;
  }

  .status-card {
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px 12px;
  }

  .sync-pill {
    margin-left: 0;
  }

  .board-frame {
    padding: 8px;
  }

  .arena-cleaner {
    inset: 8px;
  }

  .arena-cleaner-card {
    margin-bottom: 8px;
  }

  .board-arena {
    gap: 7px;
  }

  .eval-column {
    width: 18px;
    flex-basis: 18px;
  }

  .eval-readout {
    font-size: 0.62rem;
  }

  .board-shell {
    border-radius: 10px;
  }

  .move-list {
    max-height: 140px;
  }

  .captured-wrap {
    grid-template-columns: 1fr;
  }

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

  .control-panel .card {
    padding: 10px;
  }
  .bot-overlay {
    padding: 10px;
  }

  .bot-dialog {
    width: min(100%, 98vw);
    padding: 12px;
  }

  .elo-slider-badge {
    font-size: 0.72rem;
  }

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