:root {
  --bg: #f4f0e8;
  --card: #ffffff;
  --ink: #2c2a26;
  --muted: #8a8378;
  --accent: #c0392b;
  --accent2: #1f6f4a;
  --line: #e6e0d3;
  --btn: #ffffff;
  --btn-border: #d6cfc0;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  -webkit-tap-highlight-color: transparent;
}

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  padding: 14px 20px; background: #fff; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; }
.logo { font-size: 26px; }
.brand-text h1 { margin: 0; font-size: 20px; letter-spacing: 1px; }
.brand-text .sub { font-size: 12px; color: var(--muted); }
.top-controls { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.size-group, .level-group { display: flex; align-items: center; gap: 6px; }
.lbl { font-size: 13px; color: var(--muted); }
.size-btn, .mode-btn, .cat-btn {
  border: 1px solid var(--btn-border); background: var(--btn); color: var(--ink);
  padding: 7px 14px; border-radius: 8px; cursor: pointer; font-size: 14px; transition: all .15s;
}
.size-btn.active, .mode-btn.active, .cat-btn.active { background: var(--accent2); color: #fff; border-color: var(--accent2); }
select {
  padding: 7px 10px; border: 1px solid var(--btn-border); border-radius: 8px; font-size: 14px; background: #fff;
}
.rank-box {
  font-size: 13px; color: #fff; background: linear-gradient(135deg, #2c3e50, #4a5f70);
  padding: 8px 14px; border-radius: 20px; cursor: default;
}

/* ---------- 模式导航 ---------- */
.modes {
  display: flex; gap: 8px; padding: 12px 20px; background: #faf8f3; border-bottom: 1px solid var(--line);
}
.mode-btn { font-size: 15px; padding: 9px 20px; }

/* ---------- 主布局 ---------- */
.layout {
  display: grid; grid-template-columns: minmax(340px, 560px) 1fr; gap: 20px;
  padding: 20px; max-width: 1280px; margin: 0 auto; align-items: start;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
}

.board-col { display: flex; flex-direction: column; gap: 12px; }
.board-wrap {
  width: 100%; max-width: 560px; margin: 0 auto;
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
  background: #d8a84f;
}
#board-canvas { display: block; width: 100%; touch-action: none; cursor: crosshair; }

.board-actions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.btn {
  border: 1px solid var(--btn-border); background: var(--btn); color: var(--ink);
  padding: 9px 14px; border-radius: 8px; cursor: pointer; font-size: 14px; transition: all .15s;
}
.btn:hover { border-color: var(--accent2); color: var(--accent2); }
.btn-primary { background: var(--accent2); color: #fff; border-color: var(--accent2); }
.btn-primary:hover { background: #175c3d; color: #fff; }
.btn-ghost { background: transparent; color: var(--muted); }
.btn.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-mini { padding: 4px 10px; font-size: 12px; }

.status {
  font-size: 14px; color: #5a5348; background: #fff; border: 1px solid var(--line);
  border-radius: 8px; padding: 10px 14px; text-align: center; min-height: 20px;
}

/* ---------- 侧栏面板 ---------- */
.panel { display: flex; flex-direction: column; gap: 14px; }
.panel-sec { display: none; flex-direction: column; gap: 14px; }
.panel-sec.active { display: flex; }
.card { background: var(--card); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 12px; font-size: 15px; color: #4a443a; border-left: 4px solid var(--accent2); padding-left: 8px; }

.winbar { display: flex; height: 18px; border-radius: 9px; overflow: hidden; background: #eee; }
.winbar-black { background: #222; width: 50%; transition: width .4s; }
.winbar-white { background: #fff; width: 50%; border-left: 1px solid #bbb; transition: width .4s; }
.winbar-labels { display: flex; justify-content: space-between; font-size: 13px; margin-top: 6px; }
#winrate-black { color: #222; font-weight: 600; }
#winrate-white { color: #888; font-weight: 600; }

.recommend { font-size: 14px; color: var(--accent); font-weight: 600; min-height: 20px; }

.comment {
  white-space: pre-wrap; font-family: inherit; font-size: 14px; line-height: 1.7;
  color: #3a352d; margin: 0; background: #faf8f3; border-radius: 8px; padding: 12px; min-height: 60px;
}

.move-list { list-style: none; margin: 0; padding: 0; max-height: 300px; overflow-y: auto; font-size: 14px; }
.move-list li { padding: 3px 0; }
.move-list li.hl { background: #fff5d6; border-radius: 4px; }
.move-list .empty { color: var(--muted); }
.mv-num { color: var(--muted); margin-right: 8px; font-size: 12px; display: inline-block; min-width: 24px; }
.mv.b { color: #222; font-weight: 600; }
.mv.w { color: #777; font-weight: 600; }

/* 复盘 */
.review-controls { display: flex; gap: 8px; margin-bottom: 10px; }
.curve { background: #faf8f3; border-radius: 8px; padding: 8px; }
.curve-svg { width: 100%; height: auto; }
.curve-mid { stroke: #ddd; stroke-width: 1; stroke-dasharray: 3 3; }
.curve-line { fill: none; stroke: var(--accent2); stroke-width: 2; }
.curve-dot { fill: var(--accent); }
.curve-empty { color: var(--muted); font-size: 13px; padding: 20px 0; text-align: center; }

/* 训练 */
.train-cats { display: flex; gap: 8px; margin-bottom: 12px; }
.train-title { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.train-question { font-size: 14px; color: #5a5348; margin-bottom: 10px; line-height: 1.6; }
.train-actions { display: flex; gap: 8px; margin-top: 12px; }
.train-explain { font-size: 14px; line-height: 1.8; background: #eef7f1; border-left: 4px solid var(--accent2); padding: 10px 12px; border-radius: 6px; margin-top: 10px; }

/* 棋谱 */
.record-actions { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.records-list { list-style: none; margin: 0; padding: 0; }
.records-list .record {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 10px; border: 1px solid var(--line); border-radius: 8px; margin-bottom: 8px;
}
.records-list .empty { color: var(--muted); padding: 12px 0; }
.rec-main { cursor: pointer; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.rec-date { font-size: 13px; color: #4a443a; }
.rec-meta { font-size: 12px; color: var(--muted); }
.rec-result { font-size: 12px; color: var(--accent); }
.rec-ops { display: flex; gap: 6px; flex-shrink: 0; }