/* learn.manymany.games - the site's own pages (home, accessibility, privacy, terms, 404).
   Same palette and fonts as the geometry tool, so moving between them feels like one site. */
:root {
  --bg: #f2f4f8; --bg2: #e8ecf2; --panel: #ffffff; --ink: #162033; --ink2: #45526b; --ink3: #5b6680;
  --line: #dde3ec; --line2: #cad2de; --accent: #4b45d6; --accent-soft: #e9e8fd; --accent-ink: #3730a3;
  --given: #2563eb; --concl: #e8590c; --hl: #7c3aed;
  --shadow: 0 1px 2px rgba(20, 24, 40, .05), 0 6px 22px rgba(20, 24, 40, .07);
  --font: 'Rubik', system-ui, -apple-system, 'Segoe UI', Arial, sans-serif;
  --display: 'Secular One', 'Rubik', system-ui, -apple-system, 'Segoe UI', Arial, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10131a; --bg2: #181c26; --panel: #1b202b; --ink: #e7eaf1; --ink2: #b3bccd; --ink3: #9aa4b8;
    --line: #2a303d; --line2: #384052; --accent: #8b85ff; --accent-soft: #2a2950; --accent-ink: #c7c3ff;
    --given: #60a5fa; --concl: #fb923c; --hl: #b197fc;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 22px rgba(0, 0, 0, .3);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.65 var(--font); min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
a { color: var(--accent-ink); text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.skip { position: absolute; inset-inline-start: -999px; top: 8px; z-index: 100; background: var(--panel); color: var(--ink); padding: 8px 14px; border-radius: 10px; }
.skip:focus { inset-inline-start: 8px; }
.wrap { width: min(1080px, 100% - 32px); margin-inline: auto; }

/* ---- header ---- */
.sh {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  width: min(1080px, 100% - 32px); margin: 0 auto; padding: 16px 0;
}
.sh-brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.mark { width: 38px; height: 38px; flex: none; }
.sh-word { font: 400 22px/1 var(--display); white-space: nowrap; }
.sh-word b { font-weight: 400; color: var(--accent); }
.sh-nav { display: flex; gap: 2px; }
.sh-nav a { white-space: nowrap; }
.sh-nav a { color: var(--ink); text-decoration: none; padding: 8px 12px; border-radius: 10px; font-weight: 500; }
.sh-nav a:hover { background: var(--bg2); }
.ext { font-size: .8em; margin-inline-start: 3px; color: var(--ink3); }

/* ---- home ---- */
.hero { padding: 40px 0 26px; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 32px; align-items: center; }
.eyebrow { display: inline-block; font-size: 15px; font-weight: 600; color: var(--accent-ink); background: var(--accent-soft); padding: 4px 12px; border-radius: 999px; }
.hero h1 { font: 400 clamp(34px, 5vw, 52px)/1.15 var(--display); margin: 14px 0 12px; text-wrap: balance; }
.lead { font-size: 19px; color: var(--ink2); margin: 0 0 22px; max-width: 46ch; }
.hero-art { justify-self: center; width: min(360px, 100%); }
.hero-art svg { width: 100%; height: auto; display: block; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; text-decoration: none; font-weight: 600; font-size: 17px;
  padding: 12px 22px; border-radius: 14px; border: 1.5px solid var(--line2); background: var(--panel); color: var(--ink); cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 35%, transparent); }
@media (prefers-color-scheme: dark) { .btn.primary { color: #12122a; } }
.btn.primary:hover { filter: brightness(1.08); }
.btn .arr { font-size: 1.1em; }

.section { padding: 26px 0; }
.section > h2 { font: 400 28px/1.3 var(--display); margin: 0 0 16px; }
.tools { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.tool {
  display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 22px; align-items: start;
  background: var(--panel); border: 1px solid var(--line); border-radius: 22px; padding: 22px; box-shadow: var(--shadow);
}
.tool-art { border-radius: 16px; background: var(--bg); border: 1px solid var(--line); padding: 10px;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 18px 18px; background-position: -1px -1px; }
.tool-art svg { width: 100%; height: auto; display: block; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 6px; padding: 0; list-style: none; }
.tags li { font-size: 13.5px; font-weight: 600; padding: 2px 10px; border-radius: 999px; background: var(--bg2); color: var(--ink2); }
.tool h3 { font: 400 26px/1.25 var(--display); margin: 4px 0 6px; }
.tool p { margin: 0 0 10px; color: var(--ink2); }
.feats { margin: 0 0 18px; padding: 0; list-style: none; display: grid; gap: 7px; }
.feats li { position: relative; padding-inline-start: 26px; color: var(--ink2); font-size: 16px; }
.feats li::before { content: ''; position: absolute; inset-inline-start: 4px; top: .55em; width: 10px; height: 10px; border-radius: 3px; background: var(--accent); transform: rotate(45deg); }
.soon {
  border: 2px dashed var(--line2); border-radius: 22px; padding: 22px; display: flex; flex-direction: column; justify-content: center; gap: 8px; color: var(--ink2);
}
.soon h3 { font: 400 22px/1.3 var(--display); margin: 0; color: var(--ink); }
.soon p { margin: 0; }

.perks { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; padding: 0; margin: 0; list-style: none; }
.perks li { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 18px 20px; }
.perks h3 { margin: 0 0 4px; font-size: 18px; }
.perks p { margin: 0; color: var(--ink2); font-size: 16px; }
.teachers { background: var(--accent-soft); border-radius: 18px; padding: 16px 20px; color: var(--ink); margin: 18px 0 0; }

/* ---- figures (drawn like the geometry tool: given in blue, conclusion in orange) ---- */
.fig path, .fig circle { fill: none; stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.fig .b { stroke: var(--ink); }
.fig .gv { stroke: var(--given); stroke-width: 3.2; }
.fig .cc { stroke: var(--concl); stroke-width: 3.2; }
.fig .thin { stroke-width: 2.2; }
.fig .hl { stroke: var(--hl); }
.fig .soft { stroke-opacity: .45; stroke-dasharray: 2 7; }
.fig .fill { fill: color-mix(in srgb, var(--accent) 10%, transparent); stroke: none; }
.fig text { font: italic 20px 'Cambria Math', 'STIX Two Math', 'Times New Roman', serif; fill: var(--ink); direction: ltr; }

/* ---- text pages (accessibility, privacy, terms) ---- */
.doc { width: min(780px, 100% - 32px); margin: 0 auto; padding: 24px 0 40px; }
.doc h1 { font: 400 clamp(30px, 4.5vw, 40px)/1.2 var(--display); margin: 10px 0 6px; }
.doc .updated { color: var(--ink3); margin: 0 0 20px; font-size: 15px; }
.doc .card { background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 8px 28px 22px; box-shadow: var(--shadow); }
.doc h2 { font-size: 21px; margin: 24px 0 6px; }
.doc p, .doc li { color: var(--ink2); }
.doc li { margin: 4px 0; }
.doc b, .doc strong { color: var(--ink); }
.doc .short { background: var(--accent-soft); color: var(--ink); border-radius: 14px; padding: 12px 16px; margin: 18px 0 0; }
.doc table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 8px 0; }
.doc th, .doc td { text-align: start; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--ink2); }
.doc th { color: var(--ink); font-weight: 600; }

/* ---- 404 ---- */
.lost { text-align: center; padding: 70px 16px; }
.lost h1 { font: 400 40px/1.2 var(--display); margin: 10px 0; }
.lost p { color: var(--ink2); margin: 0 0 22px; }

/* ---- footer ---- */
.sf { border-top: 1px solid var(--line); background: var(--panel); margin-top: 30px; padding: 26px 0 30px; font-size: 15px; }
.sf-in { width: min(1080px, 100% - 32px); margin: 0 auto; display: flex; justify-content: space-between; gap: 20px 40px; flex-wrap: wrap; }
.sf-name { font: 400 20px/1.2 var(--display); margin: 0 0 4px; color: var(--ink); }
.sf-brand p { margin: 0; color: var(--ink2); }
.sf-nav { display: flex; flex-wrap: wrap; gap: 6px 18px; align-content: flex-start; max-width: 520px; }
.sf-nav a { color: var(--ink2); }
.sf-note, .sf-copy { width: min(1080px, 100% - 32px); margin: 14px auto 0; color: var(--ink3); font-size: 14px; }
.sf-copy { margin-top: 4px; }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; padding-top: 18px; gap: 10px; }
  .hero-art { order: -1; width: min(220px, 62%); }
  .tools { grid-template-columns: 1fr; }
  .tool { grid-template-columns: 1fr; }
  .tool-art { max-width: 300px; }
  .perks { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  body { font-size: 16px; }
  .sh { padding: 12px 0; }
  .sh-word { font-size: 19px; }
  .mark { width: 32px; height: 32px; }
  .sh-nav a { padding: 6px 7px; font-size: 15.5px; }
  .sh-brand { gap: 8px; }
  .lead { font-size: 17px; }
  .tool { padding: 16px; }
  .doc .card { padding: 4px 16px 16px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}