:root {
  --bg: #f3ece0;
  --surface: #fffaf2;
  --surface-2: #f6eedf;
  --text: #2b2118;
  --muted: #8a7a66;
  --border: #e2d4bd;
  --accent: #a8341f;
  --accent-text: #fff;
  --board: #e9c48a;
  --board-2: #dcae6c;
  --grid: #6b4423;
  --piece-hi: #fff6e3;
  --piece-lo: #e8cf9e;
  --piece-edge: #9c7440;
  --red: #b3261e;
  --black: #1f1a17;
  --last: rgba(46, 125, 50, 0.28);
  --hint: #1e88e5;
  --target: rgba(30, 136, 229, 0.75);
  --shadow: 0 6px 24px rgba(80, 50, 20, 0.12);
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171a; --surface: #1d2125; --surface-2: #252a2f; --text: #ece6dc; --muted: #9a9389;
    --border: #2f353b; --accent: #d6553c; --board: #2c3a33; --board-2: #22302a; --grid: #9fb8a8;
    --piece-hi: #f3ead6; --piece-lo: #cdb88f; --piece-edge: #7d6540; --last: rgba(129, 199, 132, 0.25);
    --hint: #64b5f6; --target: rgba(100, 181, 246, 0.8); --shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14171a; --surface: #1d2125; --surface-2: #252a2f; --text: #ece6dc; --muted: #9a9389;
  --border: #2f353b; --accent: #d6553c; --board: #2c3a33; --board-2: #22302a; --grid: #9fb8a8;
  --piece-hi: #f3ead6; --piece-lo: #cdb88f; --piece-edge: #7d6540; --last: rgba(129, 199, 132, 0.25);
  --hint: #64b5f6; --target: rgba(100, 181, 246, 0.8); --shadow: 0 6px 24px rgba(0, 0, 0, 0.4);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--text);
  font: 15px/1.5 -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  min-height: 100vh;
}
button, select, textarea { font: inherit; color: inherit; }
button {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px;
  padding: 8px 14px; cursor: pointer; transition: background .15s, transform .05s;
}
button:hover:not(:disabled) { filter: brightness(0.97); }
button:active:not(:disabled) { transform: translateY(1px); }
button:disabled { opacity: .45; cursor: default; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: transparent; }
button.danger { color: var(--accent); }
.muted { color: var(--muted); }
.center { text-align: center; }
[hidden] { display: none !important; }

/* 顶栏 */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; max-width: 1180px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; letter-spacing: 2px; }
.seal {
  display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 8px;
  background: var(--accent); color: #fff; font-size: 20px; font-family: "STKaiti", "KaiTi", serif;
}
.top-actions { display: flex; gap: 8px; }

/* 布局 */
.layout {
  display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 20px;
  max-width: 1180px; margin: 0 auto; padding: 0 16px 24px;
}
.board-area { display: flex; gap: 10px; align-items: stretch; justify-content: center; }
.board { width: 100%; max-width: min(720px, calc((100vh - 100px) * 0.85)); height: auto; display: block; touch-action: manipulation; user-select: none; }

.eval-bar {
  width: 12px; border-radius: 6px; background: var(--black); overflow: hidden;
  position: relative; display: flex; flex-direction: column-reverse; border: 1px solid var(--border);
  max-height: min(800px, calc(100vh - 90px));
}
.eval-bar.flipped { flex-direction: column; }
.eval-fill { background: var(--red); height: 50%; transition: height .4s ease; }

/* 棋盘 SVG */
.board-bg { fill: var(--board); stroke: var(--piece-edge); stroke-width: 3; }
.grid line, .grid polyline { stroke: var(--grid); stroke-width: 2.2; fill: none; }
.grid .grid-border { fill: none; stroke: var(--grid); stroke-width: 5; }
.grid .mark { stroke-width: 2; }
.river text { fill: var(--grid); font-size: 46px; font-family: "STKaiti", "KaiTi", "LXGW WenKai", serif; letter-spacing: 12px; opacity: .8; }
.coords text { fill: var(--grid); font-size: 22px; opacity: .6; }
.last-move { fill: var(--last); }
.piece { cursor: pointer; transition: transform .18s cubic-bezier(.3, .7, .4, 1); }
.piece-body { fill: url(#pieceGrad); stroke: var(--piece-edge); stroke-width: 2.5; }
.piece-ring { fill: none; stroke-width: 2.5; }
.piece.red .piece-ring { stroke: var(--red); }
.piece.black .piece-ring { stroke: var(--black); }
.piece-text { font-size: 50px; font-weight: 700; font-family: "STKaiti", "KaiTi", "LXGW WenKai", "Noto Serif SC", serif; pointer-events: none; }
.piece.red .piece-text { fill: var(--red); }
.piece.black .piece-text { fill: var(--black); }
.piece.selected .piece-body { stroke: var(--hint); stroke-width: 6; }
.piece.selected { filter: brightness(1.05); }
.piece.in-check .piece-body { stroke: #e53935; stroke-width: 7; animation: pulse 0.9s ease-in-out 3; }
@keyframes pulse { 50% { stroke-width: 12; stroke: #ff7043; } }
.target-dot { fill: var(--target); pointer-events: none; }
.target-capture { fill: none; stroke: var(--target); stroke-width: 6; pointer-events: none; }
.hint-arrow { stroke: var(--hint); stroke-width: 12; stroke-linecap: round; opacity: .75; pointer-events: none; }
.skill-dot { fill: var(--accent); opacity: .8; pointer-events: none; }
.skill-mark { fill: none; stroke: var(--accent); stroke-width: 7; pointer-events: none; }

/* 面板 */
.panel { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.status {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 14px; font-weight: 600; box-shadow: var(--shadow);
}
.status.alert { color: var(--accent); }
.players { display: flex; flex-direction: column; gap: 8px; }
.players.flipped { flex-direction: column-reverse; }
.card {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 14px;
  transition: border-color .2s, box-shadow .2s;
}
.card .dot { width: 14px; height: 14px; border-radius: 50%; }
.card.red .dot { background: var(--red); }
.card.black .dot { background: var(--black); outline: 1px solid var(--muted); }
.card .name { font-weight: 600; }
.card .sub { font-size: 12px; color: var(--muted); }
.card .caps { font-family: "STKaiti", "KaiTi", serif; font-size: 16px; color: var(--muted); max-width: 120px; text-align: right; word-break: break-all; }
.card.active { border-color: var(--accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 25%, transparent); }
.card.thinking .dot { animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .2; } }

.controls { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.controls button { padding: 9px 4px; font-size: 14px; }

.ult-bar {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 12px;
}
.ult-head { display: flex; justify-content: space-between; align-items: baseline; font-weight: 700; margin-bottom: 6px; }
.ult-head small { font-weight: 400; color: var(--muted); }
.skill-row { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.skill-btn { text-align: left; padding: 8px 10px; min-height: 58px; }
.skill-btn b { display: block; font-size: 14px; }
.skill-btn small { display: block; color: var(--muted); font-size: 11px; line-height: 1.35; }
.skill-btn.armed { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); color: var(--accent); }
.skill-btn.spent { opacity: .45; }
.ult-op { margin-top: 6px; font-size: 12px; color: var(--muted); }
.skill-tip { margin-top: 6px; font-size: 12px; color: var(--accent); font-weight: 600; }
.move-list .mv.skill { color: var(--accent); }

.moves-box, .engine-box, .review {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 12px;
}
.box-head { display: flex; justify-content: space-between; align-items: center; font-weight: 600; margin-bottom: 6px; }
.nav { display: flex; gap: 4px; }
.nav button { padding: 2px 8px; font-size: 12px; }
.move-list { max-height: 240px; overflow-y: auto; font-family: "STKaiti", "KaiTi", serif; font-size: 16px; }
.move-list .row { display: grid; grid-template-columns: 34px 1fr 1fr; align-items: center; }
.move-list .no { color: var(--muted); font-size: 13px; font-family: sans-serif; }
.move-list .mv { padding: 2px 6px; border-radius: 6px; cursor: pointer; white-space: nowrap; }
.move-list .mv:hover { background: var(--surface-2); }
.move-list .mv.cur { background: var(--accent); color: #fff; }
.move-list em { font-style: normal; font-family: sans-serif; font-size: 12px; font-weight: 700; margin-left: 3px; }
.m-blu { color: #e53935; } .m-mis { color: #fb8c00; } .m-in { color: #c0a000; } .m-best { color: #43a047; }
.mv.cur em { color: #fff; }
.engine-info { font-size: 13px; color: var(--text); min-height: 40px; }
.engine-info .pv { font-family: "STKaiti", "KaiTi", serif; font-size: 15px; color: var(--muted); }

/* 复盘 */
.sum { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 12px; margin-bottom: 8px; }
.sum-head { font-size: 12px; font-weight: 600; }
.sum-head.red { color: var(--red); } .sum-head.black { color: var(--text); }
.acc { font-size: 28px; font-weight: 700; line-height: 1.1; }
.acc small { font-size: 14px; color: var(--muted); }
.tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 4px; }
.tag { font-size: 11px; padding: 1px 6px; border-radius: 6px; background: var(--surface-2); }
.t-best { color: #43a047; } .t-in { color: #b39200; } .t-mis { color: #fb8c00; } .t-blu { color: #e53935; }
.chart-wrap { height: 110px; }
.chart { width: 100%; height: 100%; cursor: crosshair; display: block; border-radius: 8px; background: var(--surface-2); }
.chart .area-red { fill: color-mix(in srgb, var(--red) 30%, transparent); }
.chart .area-black { fill: color-mix(in srgb, var(--text) 18%, transparent); }
.chart .axis { stroke: var(--border); }
.chart .line { fill: none; stroke: var(--text); stroke-width: 1.5; }
.chart .cursor { stroke: var(--hint); stroke-width: 2; }
.dot-blunder { fill: #e53935; } .dot-mistake { fill: #fb8c00; }
.progress { height: 8px; border-radius: 4px; background: var(--surface-2); overflow: hidden; }
.progress .bar { height: 100%; width: 0; background: var(--accent); transition: width .2s; }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translate(-50%, 20px); opacity: 0;
  background: var(--text); color: var(--bg); padding: 10px 18px; border-radius: 22px; max-width: calc(100% - 32px);
  transition: opacity .25s, transform .25s; pointer-events: none; z-index: 20; box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* 对话框 */
dialog {
  border: 1px solid var(--border); border-radius: 18px; background: var(--surface); color: var(--text);
  padding: 20px 22px; width: min(460px, calc(100% - 32px)); box-shadow: 0 20px 60px rgba(0, 0, 0, .35);
}
#new-dialog.ult-open { width: min(560px, calc(100% - 32px)); }
.checkline { display: flex; gap: 8px; align-items: center; margin: 0 0 8px; font-weight: 600; }
.ult-setup { margin-bottom: 8px; }
.ult-picker { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; max-height: 38vh; overflow: auto; margin-top: 8px; }
.skill-card { text-align: left; padding: 8px 10px; }
.skill-card b { display: block; font-size: 14px; }
.skill-card small { color: var(--muted); font-size: 12px; }
.skill-card.on { border-color: var(--accent); color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.skill-card.on small { color: var(--accent); }
dialog::backdrop { background: rgba(20, 12, 4, .45); backdrop-filter: blur(2px); }
dialog h2 { margin: 0 0 12px; font-size: 20px; }
fieldset { border: none; padding: 0; margin: 0 0 14px; }
legend { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.seg { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.levels { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.seg label, .levels label { position: relative; }
.seg input, .levels input { position: absolute; opacity: 0; }
.seg span, .levels span {
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
  padding: 10px 4px; border: 1px solid var(--border); border-radius: 10px; cursor: pointer; background: var(--surface-2);
}
.levels small { font-size: 11px; color: var(--muted); }
.seg input:checked + span, .levels input:checked + span { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); color: var(--accent); }
.seg input:focus-visible + span, .levels input:focus-visible + span { outline: 2px solid var(--hint); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; flex-wrap: wrap; }
#result-dialog { text-align: center; }
#result-dialog h2 { font-size: 30px; font-family: "STKaiti", "KaiTi", serif; }
#result-dialog[data-kind="win"] h2 { color: var(--accent); }
#result-dialog .dialog-actions { justify-content: center; }
#result-extra .up { color: #43a047; font-weight: 700; } #result-extra .down { color: #e53935; font-weight: 700; }

.puzzle-list { display: flex; flex-direction: column; gap: 8px; max-height: 50vh; overflow-y: auto; }
.puzzle-item { display: grid; grid-template-columns: 32px 1fr 24px; align-items: center; gap: 10px; text-align: left; padding: 10px 12px; }
.pz-no { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--surface); font-weight: 700; }
.pz-body { display: flex; flex-direction: column; } .pz-body small { color: var(--muted); }
.puzzle-item.solved .pz-no { background: #43a047; color: #fff; }
.pz-ok { color: #43a047; font-weight: 700; }

.stats table { width: 100%; border-collapse: collapse; margin-bottom: 12px; font-size: 14px; }
.stats th, .stats td { padding: 4px 6px; text-align: center; border-bottom: 1px solid var(--border); }
.stats .rating { font-size: 22px; color: var(--accent); }
.opt-row { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; margin: 10px 0; }
.opt-row button { padding: 6px 10px; font-size: 13px; }
select, textarea { background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 4px 8px; }
textarea { width: 100%; font-family: ui-monospace, Consolas, monospace; font-size: 12px; resize: vertical; }
.fen-label { font-size: 13px; color: var(--muted); }

/* 移动端 */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; gap: 12px; padding: 0 16px 24px; }
  .board { max-width: 100%; }
  .board-area { gap: 6px; }
  .eval-bar { width: 8px; }
  .move-list { max-height: 180px; }
  .topbar { padding: 8px 16px; }
  .brand { font-size: 17px; }
  .top-actions button { padding: 7px 10px; font-size: 14px; }
}
@media (max-width: 420px) {
  .levels { grid-template-columns: repeat(3, 1fr); }
  .controls button { font-size: 13px; }
}