/* Swiss minimal: one type family, a strict grid, black on white, one red. */
:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #8a8a8a;
  --rule: #d9d9d9;
  --rule-strong: #111111;
  --accent: #e2001a;
  --cell-fill: #111111;
  --cell-mark: #b5b5b5;
  --given-bg: #f0f0f0;
  --sel: rgba(226, 0, 26, 0.14);
  --hl: rgba(0, 0, 0, 0.06);
  --ok: #1a9e4b;
  --water: #9ec6ea;
  --font: "Helvetica Neue", Helvetica, Arial, "Liberation Sans", sans-serif;
  --gutter: 16px;
  --maxw: 1280px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111111; --fg: #f2f2f2; --muted: #8c8c8c; --rule: #333333; --rule-strong: #f2f2f2;
    --accent: #ff3b4a; --cell-fill: #f2f2f2; --cell-mark: #5a5a5a; --given-bg: #1f1f1f;
    --sel: rgba(255, 59, 74, 0.22); --hl: rgba(255, 255, 255, 0.08); --ok: #3fcf78; --water: #2f5f8a;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111111; --fg: #f2f2f2; --muted: #8c8c8c; --rule: #333333; --rule-strong: #f2f2f2;
  --accent: #ff3b4a; --cell-fill: #f2f2f2; --cell-mark: #5a5a5a; --given-bg: #1f1f1f;
  --sel: rgba(255, 59, 74, 0.22); --hl: rgba(255, 255, 255, 0.08); --ok: #3fcf78; --water: #2f5f8a;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg); font-family: var(--font);
  font-size: 16px; line-height: 1.45; -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
button { font: inherit; color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -0.02em; }
ul, ol { margin: 0; padding: 0; list-style: none; }
.muted { color: var(--muted); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

/* ---- header ---- */
.site { border-bottom: 1px solid var(--rule); }
.site .wrap { display: flex; align-items: baseline; justify-content: space-between; height: 56px; align-items: center; }
.brand { font-weight: 700; letter-spacing: -0.01em; font-size: 17px; }
.brand span { color: var(--accent); }
.site nav { display: flex; gap: 20px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.1em; }
.site nav button { background: none; border: 0; padding: 0; cursor: pointer; text-transform: inherit; letter-spacing: inherit; font-size: inherit; }

/* ---- home ---- */
.hero { padding: 64px 0 40px; border-bottom: 1px solid var(--rule); }
.hero h1 { font-size: clamp(40px, 8vw, 96px); line-height: 0.95; letter-spacing: -0.04em; }
.hero p { max-width: 36em; margin: 24px 0 0; font-size: 18px; color: var(--muted); }
.hero .count { color: var(--accent); }
.games { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); border-left: 1px solid var(--rule); border-top: 1px solid var(--rule); }
.games a { display: block; padding: 22px 20px 26px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); min-height: 150px; position: relative; }
.games a:hover { background: var(--fg); color: var(--bg); }
.games a:hover .num, .games a:hover .tag { color: inherit; }
.games .num { font-size: 12px; letter-spacing: 0.14em; color: var(--muted); display: block; margin-bottom: 26px; }
.games .name { font-size: 24px; font-weight: 700; letter-spacing: -0.02em; display: block; line-height: 1.1; }
.games .tag { display: block; margin-top: 8px; font-size: 14px; color: var(--muted); }
.games .thumb { position: absolute; right: 16px; top: 18px; width: 36px; height: 36px; opacity: 0.9; }
footer { padding: 40px 0 60px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--rule); margin-top: 0; }

/* ---- play page ---- */
.play { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 48px; padding: 24px 0 60px; }
.title-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 24px; margin-bottom: 4px; }
.title-row h1 { font-size: clamp(28px, 5vw, 44px); letter-spacing: -0.03em; }
.meta { display: flex; gap: 16px; font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.meta b { color: var(--fg); font-weight: 600; }
.meta #timer { font-variant-numeric: tabular-nums; color: var(--fg); }
.tagline { color: var(--muted); margin: 0 0 16px; }

.toolbar { display: flex; flex-wrap: wrap; gap: 6px; padding: 12px 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); margin-bottom: 16px; }
.toolbar .sp { flex: 1; }
.btn { background: none; border: 1px solid var(--fg); border-radius: 0; padding: 7px 12px; font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; cursor: pointer; line-height: 1; min-height: 34px; }
.btn:hover:not(:disabled) { background: var(--fg); color: var(--bg); }
.btn:disabled { opacity: 0.3; cursor: default; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--fg); border-color: var(--fg); }
.btn.on { background: var(--fg); color: var(--bg); }
.btn.icon { min-width: 34px; padding: 7px 8px; }
.variant-select { display: none; }

.board-wrap { overflow: auto; max-width: 100%; -webkit-overflow-scrolling: touch; }
.board-canvas { display: block; touch-action: none; user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; }

.keypad { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0 0; }
.keypad .key { width: 44px; height: 44px; border: 1px solid var(--fg); background: none; font-size: 18px; cursor: pointer; }
.keypad .key:hover { background: var(--fg); color: var(--bg); }
.keypad .key.on { background: var(--accent); color: #fff; border-color: var(--accent); }

.status { margin-top: 16px; font-size: 15px; min-height: 22px; }
.status.ok { color: var(--ok); font-weight: 600; }
.status.bad { color: var(--accent); }

.side h2 { font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin: 0 0 10px; padding-top: 14px; border-top: 1px solid var(--rule); }
.side section { margin-bottom: 28px; }
.side ul li, .side ol li { font-size: 14px; padding: 4px 0; }
.side #variants a { display: block; padding: 4px 0; }
.side #variants a.active { color: var(--accent); font-weight: 700; }
.side #variants a.active::before { content: "— "; }
.side #rules li, .side #controls li { padding-left: 14px; text-indent: -14px; }
.side #rules li::before, .side #controls li::before { content: "– "; color: var(--muted); }
.side ol { counter-reset: n; }
.side ol li { counter-increment: n; }
.side ol li::before { content: counter(n, decimal-leading-zero) " "; color: var(--muted); font-size: 12px; letter-spacing: 0.1em; margin-right: 6px; }
.example-canvas { display: block; max-width: 100%; }
.example-caption { font-size: 13px; margin: 8px 0 0; }
#hof-form { display: flex; gap: 6px; margin-top: 10px; }
#hof-form input { flex: 1; min-width: 0; border: 1px solid var(--fg); background: none; color: inherit; padding: 7px 10px; font: inherit; font-size: 14px; border-radius: 0; }
.side-close { display: none; }

@media (max-width: 960px) {
  .play { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .side { display: none; }
  body.show-side .side { display: block; }
  .variant-select { display: inline-block; border: 1px solid var(--fg); background: none; color: inherit; padding: 7px 10px; font: inherit; font-size: 13px; border-radius: 0; }
  .side-close { display: inline-block; margin-top: 8px; }
  .site nav { gap: 14px; }
  .site nav .home { display: none; }
}
@media (max-width: 480px) {
  .btn { padding: 7px 9px; font-size: 12px; }
  #btn-print { display: none; }
  .meta { gap: 10px; font-size: 12px; }
  .games { grid-template-columns: 1fr; border-left: 0; }
  .games a { border-right: 0; }
}
@media print {
  .site, .toolbar, .side, .keypad, .status, footer, .tagline { display: none !important; }
  .play { display: block; }
  body { background: #fff; color: #000; }
}