/* All Chess Positions — the reading pages (openings, famous games, questions). The same dark world as the map:
   ink-black ground, warm gold for what matters, Archivo for words and JetBrains Mono for moves and numbers. */
:root {
  --bg: #080C0A; --bg-2: #0D1210; --bg-3: #131A16; --line: #1D2722; --line-2: #2A3630;
  --fg: #ECEADF; --fg-2: #A8B1AA; --fg-3: #6C7870; --gold: #E3B552; --gold-2: #F6DC98; --mate: #F2694E;
  --sq-l: #D3CDB3; --sq-d: #6E8961; --sq-hl: rgba(227, 181, 82, .55);
  --f-ui: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --w: 1120px; --prose: 700px;
  color-scheme: dark;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--f-ui); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--gold-2); text-decoration-color: rgba(246, 220, 152, .35); text-underline-offset: 3px; }
a:hover { color: var(--fg); text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
img, svg { max-width: 100%; }
.mono { font-family: var(--f-mono); }
.prose .mono, .answer .mono { font-size: .9em; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 12px; top: 12px; z-index: 9; background: var(--bg-3); padding: 8px 12px; border-radius: 8px; }

/* ---- header ---- */
.hd { border-bottom: 1px solid var(--line); background: rgba(8, 12, 10, .92); position: sticky; top: 0; z-index: 5; backdrop-filter: blur(8px); }
.hd-in { max-width: var(--w); margin: 0 auto; padding: 0 20px; height: 56px; display: flex; align-items: center; gap: 22px; }
.brand { display: flex; align-items: center; gap: 11px; color: var(--fg); text-decoration: none; font-stretch: 125%; font-weight: 600; font-size: 13px; letter-spacing: .16em; text-transform: uppercase; white-space: nowrap; flex: none; }
.brand i { width: 8px; height: 8px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 14px var(--gold); }
.brand:hover { color: var(--gold-2); }
.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { color: var(--fg-2); text-decoration: none; font-size: 14px; padding: 6px 10px; border-radius: 8px; white-space: nowrap; }
.nav a:hover, .nav a[aria-current] { color: var(--fg); background: var(--bg-3); }
.nav .lng { margin-left: 6px; border: 1px solid var(--line-2); border-radius: 999px; font-size: 12px; font-weight: 600; letter-spacing: .08em; padding: 4px 10px; }
.play { flex: none; color: var(--bg); background: var(--gold); font-weight: 600; font-size: 14px; text-decoration: none; padding: 7px 14px; border-radius: 999px; white-space: nowrap; }
.play:hover { color: var(--bg); background: var(--gold-2); }

/* ---- page frame ---- */
main { max-width: var(--w); margin: 0 auto; padding: 28px 20px 64px; }
.crumbs { font-size: 13px; color: var(--fg-3); margin: 0 0 18px; }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 8px; }
.crumbs li:not(:last-child)::after { content: "›"; margin-left: 8px; color: var(--line-2); }
.crumbs a { color: var(--fg-2); text-decoration: none; }
.crumbs a:hover { color: var(--gold-2); }
h1 { margin: 0; font-stretch: 112%; font-weight: 400; font-size: clamp(30px, 4.4vw, 50px); line-height: 1.08; letter-spacing: -.01em; text-wrap: balance; }
h1 .fam { display: block; font-size: .46em; font-weight: 500; letter-spacing: .02em; color: var(--fg-2); margin-bottom: 8px; }
h2 { margin: 48px 0 14px; font-stretch: 112%; font-weight: 500; font-size: 22px; line-height: 1.25; }
h3 { margin: 28px 0 10px; font-size: 17px; font-weight: 600; }
.eyebrow { margin: 0 0 12px; font-stretch: 118%; font-weight: 600; font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--gold); }
.eyebrow .eco { font-family: var(--f-mono); letter-spacing: .04em; color: var(--fg-2); margin-right: 10px; }
.lede { margin: 16px 0 0; font-size: 19px; line-height: 1.55; color: var(--fg-2); max-width: var(--prose); text-wrap: pretty; }
.line { margin: 14px 0 0; font-family: var(--f-mono); font-size: 15px; color: var(--fg); line-height: 1.7; }
.line b { color: var(--gold-2); font-weight: 500; }
.prose { max-width: var(--prose); }
.prose p { margin: 0 0 16px; text-wrap: pretty; }
.prose p.big { font-size: 19px; color: var(--fg); }
.prose ul { margin: 0 0 18px; padding-left: 22px; }
.prose li { margin: 0 0 10px; padding-left: 4px; text-wrap: pretty; }
.prose li::marker { color: var(--gold); }
.prose strong { color: var(--fg); font-weight: 600; }
.muted { color: var(--fg-2); }
.small { font-size: 14px; color: var(--fg-3); }

/* ---- the opening's head: board and facts ---- */
.hero { display: grid; grid-template-columns: minmax(0, 400px) minmax(0, 1fr); gap: 36px; align-items: start; margin-top: 28px; }
.board { display: block; width: 100%; height: auto; border-radius: 6px; box-shadow: 0 24px 60px -24px rgba(0, 0, 0, .9); }
.facts { display: grid; gap: 18px; }
.turn { margin: 0; display: flex; align-items: center; gap: 10px; color: var(--fg-2); font-size: 15px; }
.turn i { width: 12px; height: 12px; border-radius: 50%; border: 1px solid var(--fg-3); }
.turn i.w { background: #FBF9F1; } .turn i.b { background: #111612; }
.stats { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.stats div { background: var(--bg-2); padding: 14px 16px; }
.stats dt { font-size: 12px; color: var(--fg-3); letter-spacing: .02em; }
.stats dd { margin: 4px 0 0; font-family: var(--f-mono); font-weight: 500; font-size: 22px; color: var(--gold-2); line-height: 1.2; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px; border-radius: 999px; border: 1px solid var(--line-2); color: var(--fg); text-decoration: none; font-weight: 500; font-size: 15px; }
.btn:hover { border-color: var(--gold); color: var(--gold-2); }
.btn.primary { background: var(--gold); border-color: var(--gold); color: var(--bg); font-weight: 600; }
.btn.primary:hover { background: var(--gold-2); border-color: var(--gold-2); color: var(--bg); }
.btn svg { width: 15px; height: 15px; }

/* ---- the map picture ---- */
figure.map { margin: 40px 0 0; }
figure.map a { display: block; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); }
figure.map img { display: block; width: 100%; height: auto; }
figure.map figcaption { margin-top: 10px; font-size: 14px; color: var(--fg-3); }

/* ---- lists ---- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; border-top: 1px solid var(--line); max-width: var(--prose); }
.steps li { display: grid; grid-template-columns: 92px minmax(0, 1fr); gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.steps .mv { font-family: var(--f-mono); font-size: 15px; color: var(--fg); }
.steps .nm { color: var(--fg-2); font-size: 15px; }
.steps .nm.none { color: var(--fg-3); }
.steps li.here { background: linear-gradient(90deg, rgba(227, 181, 82, .08), transparent); }
.steps li.here .mv { color: var(--gold-2); }
.kids { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 10px; }
.kids li { border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; background: var(--bg-2); }
.kids .k { display: block; font-weight: 500; }
.kids a.k { text-decoration: none; color: var(--fg); }
.kids a.k:hover { color: var(--gold-2); }
.kids .m { display: block; margin-top: 2px; font-family: var(--f-mono); font-size: 13px; color: var(--fg-3); }
.kids .tag { font-family: var(--f-mono); font-size: 12px; color: var(--fg-3); margin-right: 6px; }
.more { margin: 12px 0 0; font-size: 14px; color: var(--fg-3); }
.fen code { display: block; font-family: var(--f-mono); font-size: 14px; background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; overflow-x: auto; white-space: nowrap; color: var(--fg-2); }

/* ---- index pages ---- */
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; }
.toc a { font-size: 14px; padding: 6px 12px; border: 1px solid var(--line-2); border-radius: 999px; text-decoration: none; color: var(--fg-2); }
.toc a:hover { color: var(--gold-2); border-color: var(--gold); }
.sec { margin-top: 52px; scroll-margin-top: 72px; }
.sec > h2 { margin-top: 0; }
.fams { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; align-items: start; }
.fam-card { border: 1px solid var(--line); border-radius: 14px; background: var(--bg-2); padding: 16px 18px; }
.fam-card h3 { margin: 0 0 8px; font-size: 18px; font-weight: 500; font-stretch: 108%; }
.fam-card h3 a { color: var(--fg); text-decoration: none; }
.fam-card h3 a:hover { color: var(--gold-2); }
.fam-card ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.fam-card li { display: flex; justify-content: space-between; gap: 12px; font-size: 15px; }
.fam-card li a { text-decoration: none; color: var(--fg-2); }
.fam-card li a:hover { color: var(--gold-2); }
.fam-card .eco { font-family: var(--f-mono); font-size: 12px; color: var(--fg-3); flex: none; padding-top: 3px; }
.fam-card .first { font-family: var(--f-mono); font-size: 13px; color: var(--fg-3); margin: -4px 0 8px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; margin-top: 8px; }
.card { display: grid; align-content: start; gap: 6px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg-2); padding: 18px; text-decoration: none; color: var(--fg); }
a.card:hover { border-color: var(--gold); }
.card .t { font-size: 18px; font-weight: 500; font-stretch: 108%; }
.card .s { font-size: 13px; color: var(--fg-3); }
.card .d { font-size: 15px; color: var(--fg-2); line-height: 1.5; }
.first-moves { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; list-style: none; padding: 0; margin: 0; }
.first-moves li { display: flex; gap: 12px; align-items: baseline; border-bottom: 1px solid var(--line); padding: 7px 0; }
.first-moves .mv { font-family: var(--f-mono); min-width: 54px; color: var(--gold-2); }

/* ---- tables ---- */
.tbl { width: 100%; max-width: var(--prose); border-collapse: collapse; font-size: 15px; margin: 6px 0 18px; }
.tbl th { text-align: left; font-weight: 600; font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--fg-3); padding: 8px 10px; border-bottom: 1px solid var(--line-2); }
.tbl td { padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl td.n, .tbl th.n { text-align: right; font-family: var(--f-mono); }
.tbl td.n { color: var(--gold-2); white-space: nowrap; }
.tbl td.mono { white-space: nowrap; }
.tbl tr.hl td { background: rgba(227, 181, 82, .07); }
.tblwrap { overflow-x: auto; max-width: var(--prose); }
.answer { border-left: 3px solid var(--gold); padding: 6px 0 6px 18px; margin: 24px 0; max-width: var(--prose); font-size: 19px; line-height: 1.55; }
.answer strong { color: var(--gold-2); font-weight: 600; }
.boards { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; margin: 10px 0 20px; }
.boards figure { margin: 0; }
.boards figcaption { font-family: var(--f-mono); font-size: 12px; color: var(--fg-3); margin-top: 6px; line-height: 1.45; }
.game-moves { font-family: var(--f-mono); font-size: 15px; line-height: 2; max-width: var(--prose); }
.game-moves .n { color: var(--fg-3); margin-right: 4px; }
.game-moves span.p { white-space: nowrap; margin-right: 10px; }
.src { font-size: 14px; color: var(--fg-3); max-width: var(--prose); }
.src ul { padding-left: 18px; margin: 6px 0 0; }

/* ---- footer ---- */
.ft { border-top: 1px solid var(--line); color: var(--fg-3); font-size: 14px; }
.ft-in { max-width: var(--w); margin: 0 auto; padding: 28px 20px 40px; display: grid; gap: 12px; }
.ft nav { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.ft a { color: var(--fg-2); text-decoration: none; }
.ft a:hover { color: var(--gold-2); }
.ft p { margin: 0; }

@media (max-width: 820px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .hero .board { max-width: 420px; }
}
/* a phone's header: the name and the map button on one line, the sections on a second one */
@media (max-width: 640px) {
  .hd-in { flex-wrap: wrap; height: auto; padding: 10px 14px 0; gap: 8px 12px; }
  .brand { flex: 1; min-width: 0; font-size: 12px; letter-spacing: .14em; }
  .brand span { overflow: hidden; text-overflow: ellipsis; }
  .play { padding: 6px 12px; font-size: 13px; }
  .nav { order: 3; width: 100%; margin: 0 -8px; padding-bottom: 6px; }
  .nav a { font-size: 14px; padding: 6px 8px; }
  .tbl td, .tbl th { padding: 8px 6px; }
}
@media (max-width: 480px) {
  main { padding: 20px 16px 48px; }
  .stats dd { font-size: 19px; }
  .steps li { grid-template-columns: 78px minmax(0, 1fr); }
  .lede { font-size: 17px; }
  .answer { font-size: 17px; }
  .kids, .fams, .cards { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }