:root {
  --bg: #1b1d23;
  --panel: #24262e;
  --panel-border: #34363f;
  --text: #e8e8ec;
  --muted: #9a9ca6;
  --accent: #4f9dff;
  --accent-dim: #2d5c99;
  --highlight: #f6f66980;
  --best-color: #3ddc6a;
  --good: #4caf50;
  --bad: #e05555;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --cat-brilliant: #1baca6;
  --cat-great: #5c8bb0;
  --cat-best: #4caf50;
  --cat-mistake: #e2a03f;
  --cat-miss: #ef5350;
  --cat-blunder: #b91c1c;

  /* Board theme: green (default) */
  --light-sq: #ebecd0;
  --dark-sq: #7c9a5f;

  /* Piece theme: classic (default) */
  --piece-white-fill: #ffffff;
  --piece-white-stroke: #202020;
  --piece-black-fill: #1a1a1a;
  --piece-black-stroke: #e8e8e8;
}

/* ---------- Board themes ---------- */
[data-board-theme="green"] {
  --light-sq: #ebecd0;
  --dark-sq: #7c9a5f;
}
[data-board-theme="wood"] {
  --light-sq: #f0d9b5;
  --dark-sq: #b5813f;
}
[data-board-theme="blue"] {
  --light-sq: #dee3e6;
  --dark-sq: #6f8fa8;
}
[data-board-theme="gray"] {
  --light-sq: #e9e9e9;
  --dark-sq: #7d7d7d;
}
[data-board-theme="classic"] {
  --light-sq: #ffffff;
  --dark-sq: #2b2b2b;
}

/* ---------- Piece themes ---------- */
[data-piece-theme="classic"] {
  --piece-white-fill: #ffffff;
  --piece-white-stroke: #202020;
  --piece-black-fill: #1a1a1a;
  --piece-black-stroke: #e8e8e8;
}
[data-piece-theme="ocean"] {
  --piece-white-fill: #4f9dff;
  --piece-white-stroke: #0d2c4d;
  --piece-black-fill: #d1453b;
  --piece-black-stroke: #3a0d0a;
}
[data-piece-theme="sunset"] {
  --piece-white-fill: #f2c14e;
  --piece-white-stroke: #5c4300;
  --piece-black-fill: #4b5670;
  --piece-black-stroke: #dfe3ec;
}
[data-piece-theme="neon"] {
  --piece-white-fill: #39f5d0;
  --piece-white-stroke: #06332b;
  --piece-black-fill: #ff3ec8;
  --piece-black-stroke: #3a0a2e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.8rem 1.5rem;
  border-bottom: 1px solid var(--panel-border);
}

.topbar h1 {
  font-size: 1.2rem;
  margin: 0;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--text);
}

.icon-btn:hover { background: var(--panel-border); }

.engine-status {
  font-size: 0.85rem;
  color: var(--muted);
}

.engine-status.ready { color: var(--good); }
.engine-status.error { color: var(--bad); }

/* ---------- Settings panel ---------- */

.settings-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 20;
}

.settings-backdrop.hidden { display: none; }

.settings-panel {
  position: fixed;
  top: 3.6rem;
  right: 1.5rem;
  width: min(320px, 90vw);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 1rem;
  z-index: 21;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.settings-panel.hidden { display: none; }

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.6rem;
}

.settings-header h2 {
  font-size: 1rem;
  margin: 0;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.5rem 0;
  font-size: 0.88rem;
  color: var(--muted);
  border-top: 1px solid var(--panel-border);
}

.settings-row:first-of-type { border-top: none; }

.settings-row select {
  background: #16171c;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 0.3rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 380px) minmax(320px, 560px) minmax(280px, 380px);
  grid-template-areas: "pgn board side";
  gap: 1rem;
  padding: 1rem;
  align-items: start;
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-areas: "pgn" "board" "side";
  }
}

.pgn-panel { grid-area: pgn; }
.board-panel { grid-area: board; }
.side-panel { grid-area: side; }

.pgn-panel, .side-panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 1rem;
}

.pgn-panel h2 {
  margin-top: 0;
  font-size: 1rem;
  color: var(--muted);
}

.pgn-panel h2.pgn-heading {
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--panel-border);
}

.chesscom-form {
  display: flex;
  gap: 0.5rem;
}

#chesscom-username {
  flex: 1;
  background: #16171c;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 0.45rem 0.6rem;
  font-size: 0.9rem;
}

.chesscom-status {
  font-size: 0.82rem;
  color: var(--muted);
  min-height: 1.1rem;
  margin-top: 0.4rem;
}

.chesscom-status.error { color: var(--bad); }

.chesscom-list {
  list-style: none;
  margin: 0.4rem 0 0;
  padding: 0;
  max-height: 260px;
  overflow-y: auto;
}

.chesscom-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.3rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
}

.chesscom-list li:hover { background: var(--panel-border); }

.chesscom-result {
  flex-shrink: 0;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: bold;
  color: #fff;
}

.chesscom-result.win { background: var(--good); }
.chesscom-result.loss { background: var(--bad); }
.chesscom-result.draw { background: var(--muted); }

.chesscom-meta {
  flex: 1;
  min-width: 0;
}

.chesscom-opponent {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chesscom-date {
  color: var(--muted);
  font-size: 0.78rem;
}

#pgn-input {
  width: 100%;
  min-height: 160px;
  background: #16171c;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 0.6rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  resize: vertical;
}

.pgn-actions {
  margin-top: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

button {
  background: var(--accent-dim);
  color: var(--text);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  font-size: 0.9rem;
}

button:hover { background: var(--accent); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.error {
  color: var(--bad);
  font-size: 0.85rem;
}

.board-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.game-header {
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  min-height: 1.2rem;
}

.opening-name {
  text-align: center;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
  min-height: 1.1rem;
}

.board-row {
  display: flex;
  gap: 0.5rem;
  width: min(100%, 520px);
}

.board-row[data-eval-pos="left"] { flex-direction: row; }
.board-row[data-eval-pos="right"] { flex-direction: row-reverse; }
.board-row[data-eval-pos="top"] { flex-direction: column; }
.board-row[data-eval-pos="bottom"] { flex-direction: column-reverse; }

.eval-bar {
  position: relative;
  flex-shrink: 0;
  background: #16171c;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  overflow: hidden;
}

.board-row[data-eval-pos="left"] .eval-bar,
.board-row[data-eval-pos="right"] .eval-bar {
  width: 26px;
}

.board-row[data-eval-pos="top"] .eval-bar,
.board-row[data-eval-pos="bottom"] .eval-bar {
  height: 26px;
}

.eval-fill {
  position: absolute;
  background: #f2f2ee;
  transition: top 0.3s ease, bottom 0.3s ease, left 0.3s ease, right 0.3s ease,
    width 0.3s ease, height 0.3s ease;
}

.eval-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-family: var(--mono);
  font-weight: bold;
  color: #fff;
  mix-blend-mode: difference;
  pointer-events: none;
  white-space: nowrap;
}

.board-wrap {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
}

.board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 2px solid var(--panel-border);
  border-radius: 4px;
  overflow: hidden;
}

.arrow-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.arrow-layer.hidden { display: none; }

.square {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: min(6vw, 2.6rem);
  user-select: none;
  cursor: pointer;
}

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

.square .piece {
  line-height: 1;
  -webkit-text-stroke: 1.2px transparent;
}

.square .piece.piece-w {
  color: var(--piece-white-fill);
  -webkit-text-stroke: 1.3px var(--piece-white-stroke);
  paint-order: stroke fill;
}

.square .piece.piece-b {
  color: var(--piece-black-fill);
  -webkit-text-stroke: 1px var(--piece-black-stroke);
  paint-order: stroke fill;
}

.square.from, .square.to {
  box-shadow: inset 0 0 0 4px var(--highlight);
}

.square.best-from, .square.best-to {
  box-shadow: inset 0 0 0 4px color-mix(in srgb, var(--best-color) 55%, transparent);
}

.square.selected {
  box-shadow: inset 0 0 0 4px color-mix(in srgb, var(--accent) 70%, transparent);
}

.square.legal-target::after {
  content: "";
  position: absolute;
  width: 26%;
  height: 26%;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.28);
  pointer-events: none;
}

.square.legal-capture::after {
  content: "";
  position: absolute;
  inset: 6%;
  width: auto;
  height: auto;
  border-radius: 50%;
  background: transparent;
  box-shadow: inset 0 0 0 4px rgba(0, 0, 0, 0.28);
}

.promotion-picker {
  position: absolute;
  transform: translate(-50%, -50%);
  display: flex;
  gap: 2px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 4px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
  z-index: 25;
}

.promotion-picker.hidden { display: none; }

.promotion-btn {
  width: 2.2rem;
  height: 2.2rem;
  font-size: 1.4rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.promotion-btn.piece-w {
  color: var(--piece-white-fill);
  -webkit-text-stroke: 1px var(--piece-white-stroke);
  paint-order: stroke fill;
}

.promotion-btn.piece-b {
  color: var(--piece-black-fill);
  -webkit-text-stroke: 1px var(--piece-black-stroke);
  paint-order: stroke fill;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.8rem;
}

.branch-status {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.branch-status.hidden { display: none; }

.branch-status button {
  padding: 0.2rem 0.6rem;
  font-size: 0.78rem;
}

.flip-label {
  margin-left: 1rem;
  font-size: 0.85rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.8rem;
}

.tab-btn {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--muted);
}

.tab-btn.active {
  background: var(--accent-dim);
  color: var(--text);
  border-color: var(--accent);
}

.tab-content.hidden { display: none; }

.engine-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.engine-controls select {
  background: #16171c;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 0.2rem;
}

.auto-label {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.analysis-output {
  font-size: 0.9rem;
  line-height: 1.5;
}

.analysis-output .hint { color: var(--muted); }

.eval-line {
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: bold;
  margin-bottom: 0.4rem;
}

.eval-line.good { color: var(--good); }
.eval-line.bad { color: var(--bad); }

.best-move {
  margin-bottom: 0.6rem;
}

.pv-line {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
  word-break: break-word;
}

.thinking {
  color: var(--muted);
  font-style: italic;
}

.move-list {
  columns: 2;
  padding-left: 1.2rem;
  font-family: var(--mono);
  font-size: 0.88rem;
  margin: 0;
}

.move-list li {
  cursor: pointer;
  padding: 1px 4px;
  border-radius: 3px;
}

.move-list li:hover { background: var(--panel-border); }

.move-list li.current {
  background: var(--accent-dim);
  color: #fff;
}

.move-num {
  color: var(--muted);
  margin-right: 4px;
}

/* ---------- Game review ---------- */

.review-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
}

.review-progress {
  font-size: 0.8rem;
  color: var(--muted);
}

.review-graph-wrap {
  position: relative;
  width: 100%;
  height: 110px;
  margin-bottom: 1rem;
  background: #101115;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  overflow: visible;
}

.review-graph-wrap.hidden { display: none; }

.review-graph {
  width: 100%;
  height: 100%;
  display: block;
  overflow: visible;
}

.review-summary.hidden { display: none; }

.review-summary-header {
  display: grid;
  grid-template-columns: 1fr 2.2rem 1.6rem 2.2rem;
  font-size: 0.82rem;
  font-weight: bold;
  padding-bottom: 0.4rem;
  margin-bottom: 0.2rem;
  border-bottom: 1px solid var(--panel-border);
}

.review-summary-header span {
  text-align: center;
}

.review-summary-header span:first-child { text-align: left; color: var(--text); }

.review-row {
  display: grid;
  grid-template-columns: 1fr 2.2rem 1.6rem 2.2rem;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0;
  font-size: 0.85rem;
  border-top: 1px solid var(--panel-border);
  position: relative;
}

.review-row:first-child { border-top: none; }

.review-row.clickable { cursor: pointer; }
.review-row.clickable:hover { background: var(--panel-border); }
.review-row.expanded { background: var(--panel-border); }

.review-row .review-label { color: var(--muted); }

.review-row .review-count {
  text-align: center;
  font-family: var(--mono);
  font-weight: bold;
  color: var(--text);
}

.cat-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  font-size: 0.6rem;
  font-weight: bold;
  color: #fff;
  margin: 0 auto;
}

.cat-badge.brilliant { background: var(--cat-brilliant); }
.cat-badge.great { background: var(--cat-great); }
.cat-badge.best { background: var(--cat-best); }
.cat-badge.mistake { background: var(--cat-mistake); }
.cat-badge.miss { background: var(--cat-miss); }
.cat-badge.blunder { background: var(--cat-blunder); }

/* Hover tooltip explaining each category — suppressed while the row is
   expanded so it doesn't cover the move list rendered right below it. */
.review-row[data-tooltip]:hover:not(.expanded)::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  margin-top: 4px;
  background: #101115;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 0.5rem 0.6rem;
  font-size: 0.78rem;
  color: var(--text);
  line-height: 1.4;
  z-index: 30;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
  white-space: normal;
}

.graph-tooltip {
  position: fixed;
  background: #101115;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 0.4rem 0.6rem;
  font-size: 0.78rem;
  color: var(--text);
  pointer-events: none;
  z-index: 40;
  max-width: 220px;
  line-height: 1.4;
}

.graph-tooltip.hidden { display: none; }

.graph-dot { cursor: pointer; }

.review-detail.hidden { display: none; }

.review-detail-list {
  list-style: none;
  margin: 0;
  padding: 0.2rem 0 0.5rem;
}

.review-detail-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.4rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.82rem;
}

.review-detail-item:hover { background: var(--accent-dim); }

.detail-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  min-width: 0;
}

.detail-move {
  font-family: var(--mono);
  color: var(--text);
}

.detail-side {
  color: var(--muted);
  font-size: 0.76rem;
}

.detail-cpl {
  font-family: var(--mono);
  color: var(--bad);
  font-size: 0.78rem;
  margin-left: auto;
}

.show-line-btn {
  flex-shrink: 0;
  padding: 0.2rem 0.55rem;
  font-size: 0.72rem;
}

.review-empty {
  color: var(--muted);
  font-size: 0.8rem;
  padding: 0.4rem 0.2rem 0.6rem;
  margin: 0;
}