:root {
  --bg: #0e1116;
  --card: #161b23;
  --line: #242b36;
  --fg: #e6eaf2;
  --dim: #8b95a7;
  --acc: #34d399;
  --acc-dim: #0f3d31;
  --black-stone: #14181f;
  --white-stone: #f2f4f8;
  --wood: #c9a678;
  --warn: #f59e0b;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--acc); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1060px; margin: 0 auto; padding: 0 20px 80px; }

header.top {
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
  background: rgba(14, 17, 22, .86); backdrop-filter: blur(8px);
}
header.top .wrap { display: flex; align-items: center; gap: 16px; padding: 14px 20px; }
.brand { font-weight: 700; letter-spacing: -.02em; font-size: 16px; color: var(--fg); }
.brand span { color: var(--acc); }
header.top nav { margin-left: auto; display: flex; gap: 18px; font-size: 14px; }
header.top nav a { color: var(--dim); }
header.top nav a:hover { color: var(--fg); text-decoration: none; }

.hero { padding: 64px 0 40px; }
.hero h1 { font-size: clamp(28px, 5vw, 44px); line-height: 1.2; letter-spacing: -.03em; margin: 0 0 14px; }
.hero p.lede { color: var(--dim); font-size: 17px; max-width: 640px; margin: 0 0 28px; }
.stats { display: flex; flex-wrap: wrap; gap: 10px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 16px; }
.stat b { display: block; font-size: 20px; font-variant-numeric: tabular-nums; }
.stat span { color: var(--dim); font-size: 12px; }

section { margin-top: 56px; }
section > h2 { font-size: 20px; letter-spacing: -.02em; margin: 0 0 6px; }
section > p.sub { color: var(--dim); margin: 0 0 20px; font-size: 14px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .grid2 { grid-template-columns: 1fr; } }

.tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.tabs button {
  background: transparent; border: 1px solid var(--line); color: var(--dim);
  padding: 7px 14px; border-radius: 8px; cursor: pointer; font: inherit; font-size: 13px;
}
.tabs button.on { background: var(--acc-dim); border-color: var(--acc); color: var(--acc); }

pre.code {
  background: #0a0d12; border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 16px; overflow-x: auto; margin: 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; line-height: 1.7;
  color: #cfd6e4; position: relative; white-space: pre;
}
.copy {
  position: absolute; top: 8px; right: 8px; background: var(--card); color: var(--dim);
  border: 1px solid var(--line); border-radius: 6px; padding: 3px 9px; font-size: 11px; cursor: pointer;
}
.copy:hover { color: var(--acc); border-color: var(--acc); }
.codewrap { position: relative; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; color: var(--dim); font-weight: 500; font-size: 12px; padding: 0 10px 8px; border-bottom: 1px solid var(--line); }
td { padding: 9px 10px; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: none; }
td.num { font-variant-numeric: tabular-nums; text-align: right; }
.tag { display: inline-block; font-size: 11px; padding: 1px 7px; border-radius: 5px; border: 1px solid var(--line); color: var(--dim); }
.tag.live { color: var(--acc); border-color: var(--acc); }
.tag.warn { color: var(--warn); border-color: var(--warn); }
.empty { color: var(--dim); font-size: 14px; padding: 18px 0; text-align: center; }

.board-wrap { display: flex; gap: 24px; flex-wrap: wrap; }
svg.board { background: var(--wood); border: 1px solid var(--line); border-radius: 12px; touch-action: none; }
.side { flex: 1; min-width: 260px; }
.players { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.pl { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; }
.pl.turn { border-color: var(--acc); background: var(--acc-dim); }
.dot { width: 16px; height: 16px; border-radius: 50%; flex: none; border: 1px solid #0006; }
.dot.b { background: var(--black-stone); border-color: #3a4454; }
.dot.w { background: var(--white-stone); }
.pl .nm { font-weight: 600; }
.pl .el { margin-left: auto; color: var(--dim); font-size: 13px; font-variant-numeric: tabular-nums; }
.moves { max-height: 380px; overflow-y: auto; font-family: ui-monospace, Menlo, monospace; font-size: 12.5px; }
.moves div { padding: 3px 8px; border-radius: 5px; display: flex; gap: 8px; }
.moves div:nth-child(odd) { background: #ffffff05; }
.moves .rj { color: var(--warn); }
.moves .sq { color: var(--dim); width: 28px; text-align: right; }
footer { border-top: 1px solid var(--line); margin-top: 72px; padding: 24px 0; color: var(--dim); font-size: 13px; }
ul.rules { margin: 0; padding-left: 20px; color: var(--dim); }
ul.rules li { margin-bottom: 6px; }
ul.rules b { color: var(--fg); font-weight: 600; }