:root {
  --bg: #14110c; --panel: #1e1913; --panel2: #26201a; --line: #3a2f24;
  --wood1: #e8c88a; --wood2: #d9b370; --wood-edge: #7a5326;
  --gold: #e6b24a; --red: #d43b2f; --black-p: #1c1c1c;
  --txt: #efe6d6; --muted: #a9997f;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: system-ui, 'Segoe UI', 'Noto Sans', Arial, sans-serif;
  background: radial-gradient(1200px 800px at 30% -10%, #221b12, var(--bg));
  color: var(--txt); min-height: 100vh;
}
.app { max-width: 1180px; margin: 0 auto; padding: 16px; }
.topbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.topbar h1 { font-size: 22px; font-weight: 700; letter-spacing: .5px; }
.topbar .sub { font-size: 12px; color: var(--muted); font-weight: 400; margin-left: 6px; }
.conn { font-size: 13px; padding: 4px 10px; border-radius: 20px; background: var(--panel2); }
.conn.on { color: #8bd450; } .conn.off { color: #d4a24a; }

.main { display: grid; grid-template-columns: auto 340px; gap: 18px; align-items: start; }
@media (max-width: 900px) { .main { grid-template-columns: 1fr; } }

/* ---- Bàn cờ ---- */
.board-wrap { display: flex; gap: 10px; }
.evalbar { width: 20px; display: flex; align-items: stretch; }
.evalbar-inner {
  flex: 1; border-radius: 10px; overflow: hidden; position: relative;
  background: linear-gradient(#2b2b2b, #111); border: 1px solid var(--line);
  display: flex; flex-direction: column-reverse;
}
.evalbar-fill { width: 100%; height: 50%; background: linear-gradient(#f3d9a0, #e6b24a); transition: height .4s ease; }

.board-area { flex: 1; }
.board {
  position: relative; width: clamp(300px, 46vw, 560px); aspect-ratio: 9/10;
  background:
    repeating-linear-gradient(90deg, rgba(122,83,38,.05) 0 2px, transparent 2px 40px),
    linear-gradient(135deg, var(--wood1), var(--wood2));
  border: 10px solid var(--wood-edge);
  border-radius: 8px; box-shadow: 0 14px 40px rgba(0,0,0,.55), inset 0 0 30px rgba(122,83,38,.25);
}
.board-lines { position: absolute; inset: 28px; width: calc(100% - 56px); height: calc(100% - 56px); overflow: visible; }
.board-lines line { stroke: #5a3d1c; stroke-width: .03; vector-effect: non-scaling-stroke; }
.board-lines line { stroke-width: 1.4px; }
.river-text { fill: #7a5326; font-size: .5px; text-anchor: middle; font-weight: 700; letter-spacing: .1px; opacity: .75; font-family: 'Noto Serif SC', serif; }

.piece-layer { position: absolute; inset: 0; }
.piece {
  position: absolute; width: calc(var(--cell,56px) * .94); height: calc(var(--cell,56px) * .94);
  transform: translate(-50%, -50%); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: calc(var(--cell,56px) * .52); font-weight: 700; cursor: pointer;
  background: radial-gradient(circle at 35% 30%, #fff6e2, #e9d3a4 60%, #caa564);
  box-shadow: 0 3px 6px rgba(0,0,0,.45), inset 0 0 0 2px rgba(120,80,30,.35), inset 0 -3px 6px rgba(120,80,30,.3);
  transition: left .18s ease, top .18s ease; user-select: none;
  font-family: 'Noto Serif SC', 'KaiTi', serif;
}
.piece.red { color: var(--red); text-shadow: 0 1px 0 rgba(255,255,255,.4); }
.piece.black { color: var(--black-p); }
.piece:hover { filter: brightness(1.06); }

.hl { position: absolute; transform: translate(-50%, -50%); pointer-events: none; border-radius: 50%; }
.hl-move { width: calc(var(--cell,56px)*.32); height: calc(var(--cell,56px)*.32); background: rgba(60,140,60,.55); box-shadow: 0 0 8px rgba(60,160,60,.6); }
.hl-capture { width: calc(var(--cell,56px)*.9); height: calc(var(--cell,56px)*.9); background: transparent; border: 3px solid rgba(210,60,50,.85); }
.hl-select { width: calc(var(--cell,56px)*.98); height: calc(var(--cell,56px)*.98); border: 3px solid var(--gold); box-shadow: 0 0 12px var(--gold); }
.hl-last { width: calc(var(--cell,56px)*.9); height: calc(var(--cell,56px)*.9); border: 2px dashed rgba(230,178,74,.7); }

.board-foot { margin-top: 10px; }
.status { display: inline-block; background: var(--panel2); padding: 8px 14px; border-radius: 8px; font-size: 14px; min-height: 34px; }

/* ---- Panel ---- */
.panel { display: flex; flex-direction: column; gap: 12px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.card.grow { min-height: 120px; }
.card-title { font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--gold); margin-bottom: 8px; }
.mini-title { font-size: 12px; color: var(--muted); margin: 6px 0 4px; }
.sub-block { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); }
.radio { display: block; padding: 5px 0; cursor: pointer; font-size: 14px; }
.radio.inline { display: inline-block; margin-right: 14px; }
.radio input { accent-color: var(--gold); margin-right: 6px; }
input[type=range] { width: 100%; accent-color: var(--gold); }

.btn {
  background: var(--panel2); color: var(--txt); border: 1px solid var(--line);
  padding: 9px 12px; border-radius: 8px; cursor: pointer; font-size: 14px; width: 100%;
  transition: .15s;
}
.btn:hover { border-color: var(--gold); background: #2f271f; }
.btn.primary { background: linear-gradient(var(--gold), #c8901f); color: #241a06; font-weight: 700; border: none; margin-top: 10px; }
.btn.run { background: linear-gradient(#3a8f3a, #2c6f2c); color: #fff; border: none; font-weight: 700; margin-top: 8px; }
.btn-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

.eval-card .eval-score { font-size: 26px; font-weight: 800; color: var(--gold); }
.depth-info { font-size: 12px; color: var(--muted); margin: 2px 0 6px; }
.pv-line { font-size: 13px; color: #cdbfa0; line-height: 1.5; min-height: 20px; word-break: break-word; }
.opening-name { font-size: 13px; color: #8bd450; margin-top: 6px; min-height: 18px; }

.move-list { max-height: 240px; overflow-y: auto; font-size: 14px; }
.move-row { display: grid; grid-template-columns: 34px 1fr 1fr; gap: 6px; padding: 3px 0; border-bottom: 1px solid rgba(58,47,36,.4); }
.move-no { color: var(--muted); }
.mv.red { color: #f0a58c; } .mv.black { color: #cfd6e6; }

.opening-list { display: flex; flex-wrap: wrap; gap: 6px; }
.op-btn { font-size: 12px; padding: 5px 9px; background: var(--panel2); border: 1px solid var(--line); border-radius: 16px; color: var(--txt); cursor: pointer; }
.op-btn:hover { border-color: var(--gold); color: var(--gold); }

/* ---- Sắp cờ (editor) ---- */
.palette { display: grid; grid-template-columns: repeat(7, 1fr); gap: 5px; margin-bottom: 8px; }
.pal { aspect-ratio: 1; border-radius: 50%; border: 1px solid var(--line); cursor: pointer;
  background: radial-gradient(circle at 35% 30%, #fff6e2, #e9d3a4 60%, #caa564);
  font-family: 'Noto Serif SC','KaiTi',serif; font-size: 18px; font-weight: 700; }
.pal.red { color: var(--red); }
.pal.black { color: var(--black-p); }
.pal.erase { background: var(--panel2); color: var(--muted); }
.pal.sel { outline: 3px solid var(--gold); box-shadow: 0 0 10px var(--gold); }
#editorCard .btn.primary { margin-top: 8px; }