:root { color-scheme: light; --bg:#fff; --fg:#222; --muted:#666; --line:#dedbd4; --panel:#fff; --panel-soft:#faf9f6; --accent:#1f6fae; --accent-soft:#eef5fb; --win:#7fb069; --draw:#b9b9b9; --loss:#d66b5f; --board-light:#f0d9b5; --board-dark:#b58863; --example-bg:#fff; --shadow:none; }
:root[data-theme="dark"] { color-scheme: dark; --bg:#171817; --fg:#eceae4; --muted:#aba79e; --line:#3a3833; --panel:#171817; --panel-soft:#1f211e; --accent:#82b6df; --accent-soft:#213441; --example-bg:#1b1d1b; --shadow:none; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { color-scheme: dark; --bg:#171817; --fg:#eceae4; --muted:#aba79e; --line:#3a3833; --panel:#171817; --panel-soft:#1f211e; --accent:#82b6df; --accent-soft:#213441; --example-bg:#1b1d1b; --shadow:none; } }
* { box-sizing:border-box; }
html { -webkit-text-size-adjust:100%; }
body { min-width:320px; margin:0; font:15px/1.58 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; background:var(--bg); color:var(--fg); }
main { width:100%; max-width:1120px; margin:0 auto; padding:34px 24px 54px; }
.page-head { border-bottom:1px solid var(--line); padding:0 0 20px; margin-bottom:24px; }
.header-main { display:flex; align-items:flex-start; justify-content:space-between; gap:14px; }
.theme-toggle { flex:0 0 auto; width:34px; height:34px; display:grid; place-items:center; padding:0; border:1px solid var(--line); border-radius:6px; background:var(--panel); color:var(--fg); cursor:pointer; }
.theme-toggle:hover { border-color:var(--accent); }
.theme-icon { display:block; width:17px; height:17px; fill:none; stroke:currentColor; stroke-width:2; stroke-linecap:round; stroke-linejoin:round; }
.theme-icon-sun { display:none; }
.theme-toggle[data-active-theme="dark"] .theme-icon-moon { display:none; }
.theme-toggle[data-active-theme="dark"] .theme-icon-sun { display:block; }
.eyebrow { color:var(--muted); font-size:12px; font-weight:700; letter-spacing:.08em; text-transform:uppercase; margin:0 0 8px; }
h1 { font-family:Georgia,"Times New Roman",serif; font-size:42px; font-weight:600; line-height:1.12; margin:0 0 10px; max-width:860px; letter-spacing:0; }
.byline { color:var(--muted); font-size:14px; margin:0; }
.page-nav { display:flex; flex-wrap:wrap; gap:14px; margin-top:16px; font-size:14px; }
.page-nav a { display:inline-flex; align-items:center; min-height:24px; padding:0; border:0; border-radius:0; background:transparent; color:var(--accent); text-decoration:none; }
.page-nav a:hover { color:var(--fg); text-decoration:underline; text-underline-offset:3px; }
.page-nav a.active { background:transparent; border:0; color:var(--fg); font-weight:700; text-decoration:none; }
.article-intro { background:transparent; border:0; border-bottom:1px solid var(--line); border-radius:0; box-shadow:none; padding:0 0 22px; margin:0 0 22px; }
.article-intro h2 { font-family:Georgia,"Times New Roman",serif; font-weight:600; font-size:24px; margin:0 0 14px; }
.article-intro p { max-width:820px; margin:0 0 14px; color:var(--fg); }
.article-intro p:last-child { margin-bottom:0; }
.article-intro strong, .article-intro cite { color:var(--fg); }
.article-intro a { color:var(--accent); text-underline-offset:2px; }
.article-intro sup { line-height:0; }
.article-section { margin:30px 0 0; padding-top:4px; }
.article-section h2 { font-family:Georgia,"Times New Roman",serif; font-weight:600; font-size:24px; margin:0 0 10px; }
.article-section > p { max-width:820px; margin:0 0 14px; color:var(--fg); }
.section-summary { max-width:820px; margin:0 0 16px; padding-left:22px; color:var(--fg); }
.section-summary li { margin:4px 0; }
.section-note { color:var(--muted); font-size:13px; margin:10px 0 0; }
.section-note a { color:var(--accent); text-underline-offset:2px; }
.references-section { max-width:820px; margin:34px 0 0; padding-top:22px; border-top:1px solid var(--line); }
.references-section h2 { font-family:Georgia,"Times New Roman",serif; font-weight:600; font-size:24px; margin:0 0 12px; }
.references { display:grid; gap:8px; margin:0; padding-left:24px; color:var(--muted); font-size:13px; line-height:1.45; }
.references li { padding-left:8px; }
.references li:target { color:var(--fg); background:var(--accent-soft); outline:4px solid var(--accent-soft); border-radius:2px; }
.references a { color:var(--accent); text-underline-offset:2px; }
.controls { display:flex; flex-wrap:wrap; align-items:flex-end; gap:12px 18px; margin:20px 0 14px; }
.control-group { flex:0 1 auto; min-width:0; }
.controls strong { display:block; margin-bottom:5px; font-size:13px; }
.seg { display:inline-flex; width:max-content; max-width:100%; overflow-x:auto; border:1px solid var(--line); border-radius:5px; background:var(--panel); -webkit-overflow-scrolling:touch; }
button { flex:0 0 auto; min-height:32px; border:0; border-right:1px solid var(--line); background:transparent; color:inherit; padding:6px 11px; cursor:pointer; white-space:nowrap; }
button:last-child { border-right:0; }
button.active { background:var(--fg); color:var(--bg); }
button:focus-visible { outline:3px solid var(--accent); outline-offset:-3px; }
.metrics { display:grid; grid-template-columns:repeat(auto-fit,minmax(min(100%,150px),1fr)); gap:0; margin:14px 0 20px; border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.metric { background:transparent; border:0; border-right:1px solid var(--line); border-radius:0; box-shadow:none; padding:11px 12px; }
.metric:last-child { border-right:0; }
.metric strong { display:block; font-size:20px; line-height:1.15; }
.metric span { color:var(--muted); }
h2 { font-size:18px; margin:22px 0 8px; }
.table-wrap { max-width:100%; overflow:auto; border:1px solid var(--line); border-radius:0; box-shadow:none; background:var(--panel); -webkit-overflow-scrolling:touch; scrollbar-gutter:stable; }
table { width:100%; min-width:920px; border-collapse:collapse; background:var(--panel); }
th, td { border-bottom:1px solid var(--line); padding:7px 8px; text-align:left; vertical-align:middle; }
th.num, td.num { text-align:right; }
th { position:sticky; top:0; background:var(--panel); z-index:1; font-size:13px; }
th[data-sort] { cursor:pointer; user-select:none; white-space:nowrap; }
th[data-sort]::after { content:""; display:inline-block; width:1em; color:var(--muted); }
th.sorted-asc::after { content:"▲"; }
th.sorted-desc::after { content:"▼"; }
.aux td:first-child { color:var(--muted); }
.aux td:nth-child(2) { padding-left:22px; color:var(--muted); }
.aux-label { color:var(--muted); font-size:12px; margin-left:6px; white-space:nowrap; }
.bar-shell { position:relative; display:block; min-width:140px; }
.bar-shell:focus-visible { outline:2px solid var(--accent); outline-offset:2px; border-radius:5px; }
.bar-shell::after { content:attr(data-tip); position:absolute; left:50%; bottom:calc(100% + 7px); transform:translate(-50%,4px); z-index:20; opacity:0; pointer-events:none; white-space:nowrap; border:1px solid var(--line); border-radius:4px; box-shadow:none; background:var(--fg); color:var(--bg); padding:4px 7px; font-size:12px; line-height:1.2; transition:opacity .12s ease, transform .12s ease; }
.bar-shell:hover::after, .bar-shell:focus-visible::after { opacity:1; transform:translate(-50%,0); }
.bar { display:flex; width:100%; height:20px; min-width:inherit; overflow:hidden; border-radius:3px; background:#ddd; }
.bar span { display:block; min-width:0; overflow:hidden; text-align:center; font-size:12px; line-height:20px; color:#111; white-space:nowrap; }
.win { background:var(--win); } .draw { background:var(--draw); } .loss { background:var(--loss); }
tr[data-stem] { cursor:pointer; }
tr[data-stem]:hover { background:var(--panel-soft); }
.detail-row > td { padding:0; background:var(--panel-soft); }
.detail-inner { padding:14px; border-bottom:1px solid var(--line); }
.detail-head { display:flex; flex-wrap:wrap; align-items:baseline; justify-content:space-between; gap:8px 12px; margin-bottom:10px; }
.detail-head h3 { margin:0; font-size:16px; }
.detail-head span { color:var(--muted); white-space:nowrap; }
.detail-note { color:var(--muted); margin:0 0 10px; }
.detail-panels { display:grid; grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr)); gap:12px; margin:12px 0; }
.detail-panel { min-width:0; overflow:hidden; border:1px solid var(--line); border-radius:0; background:var(--panel); padding:10px; }
.detail-panel.matrix-panel { grid-column:span 2; }
.detail-panel h4 { margin:0 0 8px; font-size:13px; }
.detail-panel p { margin:0; color:var(--muted); }
.detail-subtitle { color:var(--muted); font-size:12px; margin:0 0 8px; }
.detail-stat-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:6px; }
.detail-stat { border:1px solid var(--line); border-radius:0; background:var(--panel-soft); padding:7px; }
.detail-stat span { display:block; color:var(--muted); font-size:11px; }
.detail-stat strong { display:block; font-size:16px; }
.matrix-wrap { max-width:100%; overflow-x:auto; }
.matrix { min-width:380px; width:100%; border-collapse:collapse; font-size:12px; }
.matrix th, .matrix td { padding:5px; }
.examples-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr)); gap:12px; max-height:620px; overflow:auto; padding:2px; -webkit-overflow-scrolling:touch; }
.example-card { min-width:0; overflow:hidden; border:1px solid var(--line); border-radius:0; box-shadow:none; background:var(--example-bg); }
.board-link { position:relative; display:block; width:100%; aspect-ratio:1; overflow:hidden; border-bottom:1px solid var(--line); }
.board-link:focus-visible { outline:3px solid var(--accent); outline-offset:-3px; }
.board-svg { display:block; width:100%; height:100%; }
.board-square.light { fill:var(--board-light); }
.board-square.dark { fill:var(--board-dark); }
.board-piece { pointer-events:none; filter:drop-shadow(0 0.015625rem 0.015625rem rgba(0,0,0,0.35)); }
.example-meta { padding:8px 9px 9px; }
.example-title { display:block; font-size:11px; line-height:1.25; overflow-wrap:anywhere; }
.example-subtitle { display:block; color:var(--muted); font-size:11px; line-height:1.25; margin-top:3px; overflow-wrap:anywhere; }
.example-meta dl { display:grid; grid-template-columns:auto minmax(0,1fr); gap:2px 7px; margin:7px 0 0; font-size:11px; }
.example-meta dt { color:var(--muted); white-space:nowrap; }
.example-meta dd { margin:0; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.sankey-method p { max-width:820px; }
.sankey-controls { margin-top:12px; }
.sankey-panel { background:transparent; border:0; border-top:1px solid var(--line); border-radius:0; box-shadow:none; margin:18px 0; padding:18px 0 0; }
.sankey-panel-head { display:flex; align-items:flex-start; justify-content:space-between; gap:12px; margin-bottom:10px; }
.sankey-panel h2, .sankey-panel h3 { margin:0 0 4px; font-size:18px; }
.sankey-panel p { margin:0; color:var(--muted); }
.sankey-wrap { width:100%; overflow:auto; border:1px solid var(--line); border-radius:0; background:var(--panel-soft); -webkit-overflow-scrolling:touch; }
.sankey-svg { display:block; min-width:1180px; width:100%; height:auto; }
.sankey-link { fill:none; stroke-opacity:.34; mix-blend-mode:multiply; transition:stroke-opacity .12s ease; }
:root[data-theme="dark"] .sankey-link { mix-blend-mode:screen; stroke-opacity:.42; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .sankey-link { mix-blend-mode:screen; stroke-opacity:.42; } }
.sankey-link:hover { stroke-opacity:.72; }
.sankey-node { stroke:var(--panel); stroke-width:1; rx:2; }
.sankey-label { fill:var(--fg); font-size:11px; font-weight:600; pointer-events:none; }
.sankey-empty { fill:var(--muted); font-size:15px; }
.sankey-svg.is-focused .sankey-link, .sankey-svg.is-focused .sankey-node, .sankey-svg.is-focused .sankey-label { opacity:.18; }
.sankey-svg.is-focused .is-highlighted { opacity:1; }
.sankey-svg.is-focused .sankey-link.is-highlighted { stroke-opacity:.82; }
.sankey-node { cursor:pointer; }
.opening-search-group { flex:1 1 360px; }
.opening-search { width:100%; min-height:36px; border:1px solid var(--line); border-radius:4px; background:var(--panel); color:var(--fg); padding:8px 10px; font:inherit; }
.opening-search:focus { outline:3px solid var(--accent); outline-offset:-2px; }
.opening-chart-panel { background:var(--panel); border:1px solid var(--line); border-radius:0; box-shadow:none; margin:14px 0; padding:14px; }
.opening-chart-panel h2 { margin:0 0 10px; }
.opening-bars { display:grid; gap:7px; }
.opening-bar-row { display:grid; grid-template-columns:minmax(180px, 320px) minmax(160px, 1fr) minmax(120px, auto); gap:10px; align-items:center; }
.opening-bar-label { min-width:0; display:flex; gap:7px; align-items:baseline; }
.opening-bar-label strong { flex:0 0 auto; font-size:12px; color:var(--muted); }
.opening-bar-label span { min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.opening-bar-track { height:22px; overflow:hidden; border-radius:4px; background:var(--panel-soft); border:1px solid var(--line); }
.opening-bar-fill { height:100%; background:var(--accent); }
.opening-bar-value { text-align:right; white-space:nowrap; font-variant-numeric:tabular-nums; }
.opening-bar-value span { color:var(--muted); margin-left:5px; }
@media (max-width:980px) { main { padding:26px 18px 44px; } .detail-panel.matrix-panel { grid-column:auto; } }
@media (max-width:760px) { main { padding:18px 12px 36px; } h1 { font-size:31px; } .byline { font-size:13px; } .metrics { grid-template-columns:repeat(2,minmax(0,1fr)); } .metric:nth-child(2n) { border-right:0; } .metric:nth-child(n+3) { border-top:1px solid var(--line); } table { min-width:860px; font-size:12px; } th, td { padding:7px; } .bar-shell { min-width:110px; } .detail-inner { position:sticky; left:0; width:calc(100vw - 24px); max-width:calc(100vw - 24px); padding:12px; } .detail-panels { grid-template-columns:1fr; } .matrix { min-width:380px; } .examples-grid { grid-template-columns:repeat(auto-fit,minmax(min(100%,210px),1fr)); gap:10px; max-height:none; } .header-main { align-items:flex-start; } .sankey-panel { padding-top:14px; } .sankey-svg { min-width:920px; } }
@media (max-width:760px) { .opening-bar-row { grid-template-columns:1fr; gap:4px; padding:7px 0; border-bottom:1px solid var(--line); } .opening-bar-value { text-align:left; } }
@media (max-width:520px) { h1 { font-size:27px; } .page-head { padding-top:0; } .header-main { gap:10px; } .theme-toggle { width:34px; height:34px; } .article-intro { padding-bottom:18px; } .metric { padding:8px; } .metric strong { font-size:18px; } .examples-grid { grid-template-columns:1fr; } .example-meta { padding:8px; } }
@media (hover:none) { button { min-height:40px; } tr[data-stem] { -webkit-tap-highlight-color:var(--accent-soft); } }
@media print { :root { --bg:#fff; --fg:#111; --muted:#555; --line:#ccc; --panel:#fff; --panel-soft:#fff; } body { background:#fff; } main { max-width:none; padding:0; } .theme-toggle, .controls { display:none; } .table-wrap, .examples-grid, .matrix-wrap { overflow:visible; } table { min-width:0; } th { position:static; } }