:root {
  color-scheme: light;
  --bg: #f3f6f1;
  --ink: #17211d;
  --muted: #66706b;
  --panel: #ffffff;
  --line: #d9dfd7;
  --accent: #246b74;
  --accent-2: #9d5134;
  --good: #217346;
  --ok: #386d9a;
  --warn: #a86416;
  --bad: #a33434;
  --light-square: #eee1c6;
  --dark-square: #789166;
  --shadow: 0 18px 48px rgba(23, 33, 29, .12);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(135deg, rgba(36, 107, 116, .12), transparent 40%),
    linear-gradient(315deg, rgba(157, 81, 52, .12), transparent 42%),
    var(--bg);
  color: var(--ink);
}

button, textarea, select, input { font: inherit; }

button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 7px;
  min-height: 36px;
  padding: 0 11px;
  font-weight: 800;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: .48;
}

.primary-btn {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.pgn-app {
  width: min(1680px, calc(100vw - 22px));
  margin: 0 auto;
  padding: 12px 0;
}

.review-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  padding: 6px 0 12px;
}

.eyebrow {
  margin: 0 0 3px;
  color: var(--accent);
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .06em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  margin: 0;
  font-size: clamp(1.75rem, 3vw, 3rem);
  letter-spacing: 0;
}

.engine-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, .74);
  color: var(--muted);
  font-size: .82rem;
  font-weight: 800;
}

.engine-pill strong { color: var(--ink); }

.review-grid {
  display: grid;
  grid-template-columns: minmax(270px, 340px) minmax(460px, 1fr) minmax(320px, 430px);
  gap: 12px;
  align-items: start;
}

.import-panel,
.board-panel,
.analysis-panel {
  background: rgba(255, 255, 255, .92);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.import-panel,
.analysis-panel {
  padding: 14px;
  display: grid;
  gap: 12px;
}

.board-panel {
  padding: 14px;
}

.panel-heading,
.analysis-top,
.board-top,
.import-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.panel-heading h2,
.board-top h2,
.analysis-panel h2 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0;
}

.board-top p {
  margin: 0 0 3px;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 800;
}

textarea {
  width: 100%;
  min-height: 205px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 11px;
  background: #fbfcfb;
  color: var(--ink);
  line-height: 1.35;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .82rem;
}

.url-import {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: end;
}

.url-import label {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.url-import span {
  color: var(--muted);
  font-size: .68rem;
  font-weight: 900;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.url-import input {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fbfcfb;
  color: var(--ink);
  padding: 0 10px;
  font-size: .84rem;
  font-weight: 750;
}

.game-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #fbfcfb;
}

.game-card span,
.settings span,
.metric-grid span {
  display: block;
  color: var(--muted);
  font-size: .68rem;
  font-weight: 900;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.game-card strong {
  display: block;
  margin-top: 3px;
  font-size: .93rem;
}

.game-card p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: .8rem;
  line-height: 1.35;
}

.settings {
  display: grid;
  gap: 8px;
}

.settings label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

select {
  min-height: 34px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
  padding: 0 8px;
  font-weight: 750;
}

.ai-switch {
  display: inline-flex;
  justify-content: flex-start;
  align-items: center;
  color: var(--ink);
  font-size: .88rem;
  font-weight: 800;
}

.ai-switch input { accent-color: var(--accent); }

.settings .ai-switch span {
  display: inline;
  color: var(--ink);
  font-size: .88rem;
  letter-spacing: 0;
  text-transform: none;
}

.move-list {
  display: grid;
  gap: 4px;
  max-height: 310px;
  overflow: auto;
  margin: 0;
  padding: 0;
  list-style: none;
}

.move-list button {
  width: 100%;
  min-height: 32px;
  padding: 0 9px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  font-size: .78rem;
}

.move-list button.active {
  background: rgba(36, 107, 116, .12);
  border-color: rgba(36, 107, 116, .5);
}

.move-list .move-number {
  color: var(--muted);
  font-weight: 900;
}

.quality-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 88px;
  min-height: 30px;
  padding: 0 10px;
  border-radius: 999px;
  color: #fff;
  font-size: .74rem;
  font-weight: 900;
}

.quality-badge.neutral { background: #59625d; }
.quality-badge.best { background: var(--good); }
.quality-badge.excellent { background: var(--good); }
.quality-badge.inaccuracy { background: var(--ok); }
.quality-badge.mistake { background: var(--warn); }
.quality-badge.blunder { background: var(--bad); }

.board-shell {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  justify-items: center;
  margin-top: 12px;
}

.board {
  width: min(100%, 74vh, 760px);
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  border: 8px solid #31443a;
  border-radius: 8px;
  overflow: hidden;
  background: #31443a;
}

.square {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
}

.square.light { background: var(--light-square); }
.square.dark { background: var(--dark-square); }
.square.last::after,
.square.best::after {
  content: "";
  position: absolute;
  inset: 9%;
  border-radius: 6px;
  pointer-events: none;
}

.square.last::after { background: rgba(255, 214, 92, .36); }
.square.best::after {
  border: 3px solid rgba(36, 107, 116, .76);
}

.piece {
  position: relative;
  z-index: 1;
  line-height: 1;
  font-size: clamp(2rem, 7.2vh, 4.9rem);
  text-shadow: 0 2px 7px rgba(0, 0, 0, .16);
  user-select: none;
}

.piece.white { color: #f9f6ef; }
.piece.black { color: #202722; }

.coord {
  position: absolute;
  left: 5px;
  bottom: 4px;
  z-index: 2;
  color: rgba(23, 33, 29, .58);
  font-size: .58rem;
  font-weight: 900;
}

.eval-bar {
  position: relative;
  height: min(74vh, 760px);
  width: 100%;
  min-height: 280px;
  overflow: hidden;
  border: 1px solid #31443a;
  border-radius: 7px;
  background: #f8f5ee;
}

.eval-black {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: #202722;
  transition: height .24s ease;
}

.eval-score {
  position: absolute;
  left: 50%;
  bottom: 8px;
  transform: translateX(-50%);
  z-index: 2;
  min-width: 28px;
  padding: 2px 4px;
  border-radius: 5px;
  background: rgba(255, 255, 255, .84);
  color: var(--ink);
  font-size: .68rem;
  font-weight: 900;
  text-align: center;
}

.step-controls {
  display: grid;
  grid-template-columns: 42px 42px minmax(120px, 1fr) 42px 42px;
  gap: 8px;
  margin-top: 12px;
  align-items: center;
}

.step-controls button {
  min-width: 0;
  padding: 0;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.analysis-panel section {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.analysis-panel h3 {
  margin: 0 0 5px;
  color: var(--accent);
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.analysis-panel p {
  margin-bottom: 0;
  color: var(--ink);
  font-size: .9rem;
  line-height: 1.43;
}

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

.metric-grid div {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px;
  background: #fbfcfb;
}

.metric-grid strong {
  display: block;
  margin-top: 4px;
  overflow-wrap: anywhere;
  font-size: .94rem;
}

.candidate-list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding-left: 20px;
  font-size: .86rem;
  line-height: 1.35;
}

.candidate-list strong {
  display: block;
}

.candidate-list span {
  color: var(--muted);
}

@media (max-width: 1180px) {
  .review-grid {
    grid-template-columns: 320px minmax(420px, 1fr);
  }
  .analysis-panel {
    grid-column: 1 / -1;
  }
}

@media (max-width: 820px) {
  .review-header,
  .review-grid {
    display: grid;
    grid-template-columns: 1fr;
  }
  .board {
    width: min(100%, 92vw);
  }
  .board-shell {
    grid-template-columns: 30px minmax(0, 1fr);
  }
  .eval-bar {
    height: min(92vw, 620px);
  }
  .settings label {
    align-items: flex-start;
    flex-direction: column;
  }
  .url-import {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 540px) {
  .pgn-app {
    width: min(100vw - 16px, 1680px);
    padding: 8px 0;
  }
  .import-panel,
  .board-panel,
  .analysis-panel {
    padding: 11px;
  }
  .metric-grid {
    grid-template-columns: 1fr;
  }
}