:root { --ink: #16161d; --muted: #565a68; --bg: #ffffff; --soft: #f2f4fa; --brand: #3651d4; --line: #d9deea; }
@media (prefers-color-scheme: dark) { :root { --ink: #f2f2f7; --muted: #a6a9b6; --bg: #0e0f14; --soft: #1b1d26; --brand: #8ea0ff; --line: #2c2f3c; } }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 1.0625rem/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif; color: var(--ink); background: var(--bg); }
a { color: var(--brand); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; background: var(--bg); padding: 8px 12px; z-index: 1; }
header { max-width: 980px; margin: 0 auto; padding: 18px 20px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
header a.home { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 1.15rem; }
header a.home img { width: 34px; height: 34px; }
header nav { margin-left: auto; display: flex; gap: 18px; font-size: 1rem; }
header nav a { color: var(--muted); text-decoration: none; padding: 6px 0; }
header nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
main { max-width: 980px; margin: 0 auto; padding: 8px 20px 56px; }
article { max-width: 680px; }
h1 { font-size: 2.3rem; line-height: 1.15; margin: 20px 0 12px; letter-spacing: -0.02em; }
h2 { font-size: 1.35rem; margin: 32px 0 8px; }
.meta { color: var(--muted); font-size: 1rem; }
.hero { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center; padding: 16px 0 8px; }
.hero h1 { font-size: 3rem; }
.hero .lede { font-size: 1.25rem; color: var(--muted); }
.hero img { width: 100%; max-width: 340px; height: auto; justify-self: center; }
.store { display: inline-block; margin-top: 8px; }
.store img { display: block; }
.price { color: var(--muted); font-size: 1rem; margin-top: 12px; }
.how { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin: 32px 0; }
.how section, .features div { background: var(--soft); border-radius: 18px; padding: 20px; }
.how h2 { margin: 0 0 6px; font-size: 1.2rem; }
.how p { margin: 0; }
.shots { display: flex; gap: 16px; overflow-x: auto; padding: 8px 2px 16px; scroll-snap-type: x mandatory; list-style: none; margin: 0; }
.shots li { flex: 0 0 auto; scroll-snap-align: start; }
.shots img { display: block; width: 240px; height: auto; border-radius: 28px; }
.shots img { box-shadow: 0 10px 30px rgba(0,0,0,.18); }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 32px 0; }
.features h3 { margin: 0 0 6px; font-size: 1.1rem; }
.features p { margin: 0; color: var(--muted); font-size: 1rem; }
form.contact { display: grid; gap: 14px; margin-top: 16px; }
form.contact label { display: grid; gap: 4px; font-size: 1rem; font-weight: 600; }
form.contact input, form.contact textarea { font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); width: 100%; }
form.contact textarea { min-height: 160px; }
form.contact button { justify-self: start; font: inherit; font-weight: 600; padding: 12px 22px; border: 0; border-radius: 12px; background: var(--brand); color: #fff; cursor: pointer; }
@media (prefers-color-scheme: dark) { form.contact button { color: #0e0f14; } }
form.contact .trap { position: absolute; left: -9999px; }
footer { max-width: 980px; margin: 0 auto; padding: 24px 20px; color: var(--muted); font-size: 1rem; border-top: 1px solid var(--line); }
footer a { color: var(--muted); }
@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; gap: 16px; }
  .hero h1 { font-size: 2.2rem; }
  .hero img { max-width: 220px; grid-row: 1; }
  .shots img { width: 200px; }
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

/* Guide pages */
.crumbs { font-size: 1rem; color: var(--muted); margin: 8px 0 0; }
.crumbs a { color: var(--muted); }
.lede { font-size: 1.15rem; color: var(--muted); }
footer .guides { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 12px; }
footer p { margin: 0; }
.cta { background: var(--soft); border-radius: 18px; padding: 20px; margin: 36px 0 8px; }
.cta h2 { margin: 0 0 6px; font-size: 1.2rem; }
.cta p { margin: 0 0 12px; }
.cta .store img { display: block; }
.guide-list { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 16px 0 32px; }
.guide-list li { background: var(--soft); border-radius: 18px; padding: 18px 20px; }
.guide-list a { font-weight: 600; }
.guide-list p { margin: 6px 0 0; color: var(--muted); }
.faq h3 { font-size: 1.1rem; margin: 22px 0 4px; }
.faq p { margin: 0; }
.steps li { margin-bottom: 8px; }
figure { margin: 20px 0; }
figcaption { color: var(--muted); font-size: 1rem; margin-top: 8px; }
.note { border-left: 4px solid var(--brand); padding: 4px 0 4px 14px; }

/* Puzzle diagrams: tables, so the numbers stay real text in light and dark mode */
.grid { border-collapse: collapse; font-variant-numeric: tabular-nums; }
.grid td { width: 3.5rem; height: 3.5rem; padding: 0; text-align: center; vertical-align: middle; border: 1px solid var(--muted); font-size: 1.5rem; position: relative; }
.grid td.x { background: var(--ink); }
.grid td.k { background: linear-gradient(to top right, var(--ink) calc(50% - 1px), var(--muted) 50%, var(--ink) calc(50% + 1px)); color: var(--bg); font-size: 1rem; font-weight: 700; }
.grid td.k .a { position: absolute; top: 3px; right: 5px; }
.grid td.k .d { position: absolute; bottom: 3px; left: 5px; }
.grid td.hl { background: color-mix(in srgb, var(--brand) 22%, var(--bg)); }
.grid td.cand { font-size: 1rem; color: var(--brand); }
.grid td.new { color: var(--brand); font-weight: 700; }
.cgrid { border-collapse: collapse; border: 3px solid var(--ink); font-variant-numeric: tabular-nums; }
.cgrid td { width: 4rem; height: 4rem; padding: 0; text-align: center; vertical-align: middle; border: 1px solid var(--line); font-size: 1.6rem; position: relative; }
.cgrid td .t { position: absolute; top: 2px; left: 4px; font-size: 1rem; font-weight: 700; line-height: 1.2; }
.cgrid td.bt { border-top: 3px solid var(--ink); }
.cgrid td.bb { border-bottom: 3px solid var(--ink); }
.cgrid td.bl { border-left: 3px solid var(--ink); }
.cgrid td.br { border-right: 3px solid var(--ink); }
.cgrid td.new { color: var(--brand); font-weight: 700; }

/* Combinations chart */
.filter { display: flex; flex-wrap: wrap; gap: 12px 18px; align-items: end; background: var(--soft); border-radius: 18px; padding: 16px 20px; margin: 20px 0; }
.filter label { display: grid; gap: 4px; font-weight: 600; }
.filter label.check { display: flex; gap: 8px; align-items: center; }
.filter select { font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); min-width: 6rem; }
.filter input[type="checkbox"] { width: 1.25rem; height: 1.25rem; }
.filter output { flex-basis: 100%; color: var(--muted); }
.chart, .facts { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
.chart th, .chart td, .facts th, .facts td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.chart th, .facts th { position: sticky; top: 0; background: var(--bg); }
.chart td:nth-child(3) { font-weight: 600; letter-spacing: 0.04em; }
.chart tr.unique td { background: var(--soft); }
.chart td.one { color: var(--brand); font-weight: 600; white-space: nowrap; }
.scroll { overflow-x: auto; }
.app h2 { margin-bottom: 2px; }
.app dl { display: grid; grid-template-columns: max-content 1fr; gap: 4px 14px; margin: 8px 0; }
.app dt { font-weight: 600; }
.app dd { margin: 0; }
@media (max-width: 760px) {
  .grid td { width: 3.25rem; height: 3.25rem; }
  .cgrid td { width: 3.75rem; height: 3.75rem; }
  .chart th, .chart td, .facts th, .facts td { padding: 8px 6px; }
  .app dl { grid-template-columns: 1fr; }
  .app dt { margin-top: 6px; }
}
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
[hidden] { display: none !important; }