/* ─── Themes ──────────────────────────────────────────────────────────── */

:root {
  --bg:            #f0ece5;
  --surface:       #e7e2da;
  --surface-hover: #ddd8cf;
  --border:        #ccc7bf;
  --border-subtle: #e2ddd6;
  --text:          #1c1917;
  --text-dim:      #57534e;
  --text-faint:    #a8a29e;
  --accent:        #2f7d74;
  --accent-dim:    rgba(47, 125, 116, 0.12);

  --board-light:   #f0d9b5;
  --board-dark:    #b58863;

  --blunder:       #dc2626;
  --mistake:       #ea580c;
  --inaccuracy:    #ca8a04;
  --good:          #16a34a;
  --excellent:     #2563eb;
  --brilliant:     #0891b2;

  --eval-black:    #44403c;
  --eval-white:    #e7e5e4;
}

[data-theme="dark"] {
  --bg:            #1c1917;
  --surface:       #292524;
  --surface-hover: #312e2b;
  --border:        #44403c;
  --border-subtle: #2c2927;
  --text:          #e7e5e4;
  --text-dim:      #a8a29e;
  --text-faint:    #57534e;
  --accent:        #5fb3a9;
  --accent-dim:    rgba(95, 179, 169, 0.16);

  --board-light:   #f0d9b5;
  --board-dark:    #b58863;

  --blunder:       #ef4444;
  --mistake:       #f97316;
  --inaccuracy:    #eab308;
  --good:          #22c55e;
  --excellent:     #3b82f6;
  --brilliant:     #06b6d4;

  --eval-black:    #1c1917;
  --eval-white:    #e7e5e4;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:            #1c1917;
    --surface:       #292524;
    --surface-hover: #312e2b;
    --border:        #44403c;
    --border-subtle: #2c2927;
    --text:          #e7e5e4;
    --text-dim:      #a8a29e;
    --text-faint:    #57534e;
    --accent:        #5fb3a9;
    --accent-dim:    rgba(95, 179, 169, 0.16);

    --blunder:       #ef4444;
    --mistake:       #f97316;
    --inaccuracy:    #eab308;
    --good:          #22c55e;
    --excellent:     #3b82f6;
    --brilliant:     #06b6d4;

    --eval-black:    #1c1917;
    --eval-white:    #e7e5e4;
  }
}

/* ─── Base ────────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: ui-sans-serif, system-ui, -apple-system, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s, color 0.2s;
}

/* ─── Header ─────────────────────────────────────────────────────────── */

#topbar {
  padding: 14px 28px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

#topbar h1 {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.2px;
  color: var(--text);
}

#engine-status {
  font-size: 12px;
  color: var(--text-faint);
  transition: color 0.3s;
}

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

#btn-theme {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 30px;
  height: 30px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.15s, color 0.15s;
  line-height: 1;
}

#btn-theme:hover {
  border-color: var(--text-dim);
  color: var(--text);
}

/* ─── Layout ──────────────────────────────────────────────────────────── */

#layout {
  display: grid;
  grid-template-columns: 16px minmax(0, 520px) 240px;
  grid-template-areas: "evalbar board moves";
  gap: 20px;
  max-width: 860px;
  margin: 28px auto;
  padding: 0 28px;
  flex: 1;
  align-items: start;
}

/* ─── Eval Bar ────────────────────────────────────────────────────────── */

#eval-bar-container {
  grid-area: evalbar;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

@keyframes eval-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.25; }
}

#eval-bar {
  width: 6px;
  height: 400px;
  display: flex;
  flex-direction: column;
  border-radius: 3px;
  overflow: hidden;
}

#eval-bar.loading {
  animation: eval-pulse 1.4s ease-in-out infinite;
}

#eval-bar-black {
  background: var(--eval-black);
  transition: height 0.4s ease;
}

#eval-bar-white {
  background: var(--eval-white);
  transition: height 0.4s ease;
}

#eval-score {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-faint);
  writing-mode: vertical-lr;
  transform: rotate(180deg);
  letter-spacing: 0.3px;
  font-variant-numeric: tabular-nums;
}

#eval-score.loading { opacity: 0.3; }

/* ─── Board ───────────────────────────────────────────────────────────── */

#board-section {
  grid-area: board;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#board-container {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0,0,0,0.12), 0 4px 16px rgba(0,0,0,0.08);
}

#board { width: 100%; height: 100%; }

.cm-chessboard .board .square.white { fill: var(--board-light); }
.cm-chessboard .board .square.black { fill: var(--board-dark); }

/* ─── Controls ────────────────────────────────────────────────────────── */

#controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

#controls button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 5px 11px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  transition: border-color 0.15s, color 0.15s;
}

#controls button:hover:not(:disabled) {
  border-color: var(--text-dim);
  color: var(--text);
}

#controls button:disabled { opacity: 0.25; cursor: default; }

#thinking-indicator {
  font-size: 11px;
  color: var(--text-faint);
  margin-left: 8px;
}

/* ─── Input ───────────────────────────────────────────────────────────── */

#input-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

#pgn-input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 10px 12px;
  font-family: ui-monospace, 'SFMono-Regular', Consolas, monospace;
  font-size: 11px;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s, background 0.2s;
  caret-color: var(--accent);
}

#pgn-input::placeholder { color: var(--text-faint); }
#pgn-input:focus { border-color: var(--accent); background: var(--bg); }

#input-buttons {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

#btn-load {
  background: var(--accent);
  border: none;
  color: #fff;
  padding: 7px 18px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: opacity 0.15s;
}

#btn-load:hover { opacity: 0.88; }

#btn-flip,
#btn-best-move {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 7px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

#btn-flip:hover,
#btn-best-move:hover {
  border-color: var(--text-dim);
  color: var(--text);
}

#btn-best-move.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

#error-msg {
  font-size: 12px;
  color: var(--blunder);
}

/* ─── Move List ───────────────────────────────────────────────────────── */

#move-list-container { grid-area: moves; }

#move-list-container h2 {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-faint);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 4px;
}

#move-list-scroll {
  max-height: 520px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

#move-list-empty {
  padding: 16px 0;
  color: var(--text-faint);
  font-size: 13px;
}

#move-list {
  width: 100%;
  border-collapse: collapse;
  display: none;
}

#move-list.visible { display: table; }

.col-num   { width: 28px; }
.col-white { width: 50%; }
.col-black { width: 50%; }

#move-list thead th {
  padding: 4px 6px;
  font-size: 10px;
  font-weight: 500;
  color: var(--text-faint);
  text-align: left;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#move-list-body tr:hover { background: var(--surface-hover); }

#move-list-body td {
  padding: 4px 6px;
  font-size: 13px;
  cursor: pointer;
}

.move-num {
  color: var(--text-faint);
  font-size: 11px;
  text-align: right;
  padding-right: 8px !important;
  cursor: default !important;
  font-variant-numeric: tabular-nums;
}

.move-cell {
  display: flex;
  align-items: center;
  gap: 6px;
}

td.active-move {
  background: var(--surface);
  color: var(--text);
  font-weight: 500;
  border-radius: 4px;
}

/* ─── Badges ──────────────────────────────────────────────────────────── */

.badge {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.badge.brilliant  { background: var(--brilliant); }
.badge.excellent  { background: var(--excellent); }
.badge.good       { background: var(--good); }
.badge.inaccuracy { background: var(--inaccuracy); }
.badge.mistake    { background: var(--mistake); }
.badge.blunder    { background: var(--blunder); }

/* ─── Arrow ───────────────────────────────────────────────────────────── */

.cm-chessboard .arrow-info .arrow-head {
  fill: var(--accent);
  fill-rule: nonzero;
  opacity: 0.85;
}
.cm-chessboard .arrow-info .arrow-line {
  stroke: var(--accent);
  stroke-linecap: round;
  stroke-width: 5px;
  opacity: 0.7;
}

/* ─── Mobile ──────────────────────────────────────────────────────────── */

@media (max-width: 720px) {
  #layout {
    grid-template-columns: 12px 1fr;
    grid-template-rows: auto auto;
    grid-template-areas:
      "evalbar board"
      ". moves";
    padding: 0 16px;
    margin: 16px auto;
  }

  #move-list-scroll { max-height: 280px; }
}