/* Explainer pages (/how-it-works/). Same palette as the app (src/index.css). */
:root {
  --bg0: #05070a;
  --bg2: #0d1117;
  --bg3: #161b22;
  --bg4: #21262d;
  --border: rgba(255, 255, 255, 0.08);
  --border2: rgba(255, 255, 255, 0.15);
  --txt0: #f0f6fc;
  --txt1: #b1bac4;
  --txt2: #8b949e;
  --grn: #238636;
  --grn-bright: #3fb950;
  --blu-bright: #58a6ff;
  --pur: #a371f7;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 76px; }
body {
  margin: 0;
  background: var(--bg0);
  color: var(--txt1);
  font: 17px/1.7 'Inter', system-ui, -apple-system, sans-serif;
}
a { color: var(--blu-bright); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-head {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 24px;
  padding: 12px max(16px, calc((100vw - 1180px) / 2));
  background: rgba(13, 17, 23, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.logo {
  font-family: 'Outfit', sans-serif; font-weight: 800; font-size: 1.35rem;
  letter-spacing: -0.03em; color: var(--txt0); white-space: nowrap;
}
.logo em { font-style: normal; font-weight: 600; color: var(--blu-bright); }
.logo:hover { text-decoration: none; }
.site-head nav { display: flex; gap: 20px; flex: 1; font-size: 0.95rem; }
.site-head nav a { color: var(--txt1); }
.site-head nav a:hover { color: var(--txt0); text-decoration: none; }
.cta {
  display: inline-block; white-space: nowrap;
  background: var(--grn); color: #fff; font-weight: 600; font-size: 0.95rem;
  padding: 8px 16px; border-radius: 8px; border: 1px solid rgba(255, 255, 255, 0.1);
}
.cta:hover { background: var(--grn-bright); color: #000; text-decoration: none; }

@media (max-width: 640px) {
  .site-head { gap: 12px; flex-wrap: wrap; }
  .site-head nav { order: 3; flex-basis: 100%; gap: 16px; }
  .site-head .cta { margin-left: auto; padding: 6px 12px; font-size: 0.85rem; }
}

/* Article layout */
.article-layout {
  display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 56px;
  max-width: 1180px; margin: 0 auto; padding: 40px 16px 80px;
}
.toc { position: sticky; top: 84px; align-self: start; font-size: 0.9rem; line-height: 1.5; }
.toc-title { color: var(--txt2); text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.75rem; font-weight: 600; margin: 0 0 10px; }
.toc ol, .toc ul { list-style: none; margin: 0 0 28px; padding: 0; }
.toc li { margin: 0; }
.toc a { display: block; padding: 5px 10px; border-left: 2px solid var(--border); color: var(--txt1); }
.toc a:hover { color: var(--txt0); border-left-color: var(--border2); text-decoration: none; }
.toc li.here a { color: var(--txt0); border-left-color: var(--grn-bright); font-weight: 600; }

@media (max-width: 900px) {
  .article-layout { grid-template-columns: minmax(0, 1fr); gap: 0; padding-top: 24px; }
  .toc { display: none; }
}

/* Prose */
.prose { max-width: 740px; min-width: 0; }
.prose h1, .prose h2, .prose h3 { color: var(--txt0); font-family: 'Outfit', sans-serif; line-height: 1.2; letter-spacing: -0.01em; }
.prose h1 { font-size: clamp(2rem, 5vw, 2.7rem); font-weight: 800; margin: 0.2em 0 0.6em; letter-spacing: -0.02em; }
.prose h2 { font-size: 1.65rem; font-weight: 600; margin: 2.2em 0 0.6em; padding-top: 0.6em; border-top: 1px solid var(--border); }
.prose h3 { font-size: 1.2rem; font-weight: 600; margin: 1.8em 0 0.5em; }
.prose .hash { color: var(--txt2); margin-left: -0.9em; width: 0.9em; display: inline-block; opacity: 0; font-weight: 400; }
.prose h2:hover .hash, .prose h3:hover .hash { opacity: 1; text-decoration: none; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.1em; }
.prose li { margin: 0.3em 0; }
.prose strong { color: var(--txt0); }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2em 0; }
.prose code { font: 0.88em/1.5 ui-monospace, 'SFMono-Regular', Consolas, monospace; background: var(--bg4); padding: 0.15em 0.4em; border-radius: 5px; color: var(--txt0); }
.prose pre { background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; overflow-x: auto; line-height: 1.35; }
.prose pre code { background: none; padding: 0; letter-spacing: 0.15em; }
.crumbs { font-size: 0.85rem; color: var(--txt2); margin: 0; }
.crumbs a { color: var(--txt2); }

.table-wrap { overflow-x: auto; margin: 0 0 1.4em; border: 1px solid var(--border); border-radius: 10px; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.92rem; line-height: 1.45; }
.prose th, .prose td { padding: 9px 14px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
.prose th { color: var(--txt0); background: var(--bg3); font-weight: 600; }
.prose tr:last-child td { border-bottom: 0; }

/* Board figures (SVG from the app's renderer) */
figure.board { margin: 1.6em 0 1.8em; text-align: center; }
figure.board svg { width: min(100%, 440px); height: auto; max-height: 460px; filter: drop-shadow(0 8px 28px rgba(0, 0, 0, 0.55)); }
figure.board figcaption { font-size: 0.88rem; color: var(--txt2); margin-top: 10px; line-height: 1.5; }

/* Prev / next and call to action */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 3em 0 2em; }
.pager a { display: block; padding: 14px 18px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg2); color: var(--txt0); font-weight: 600; line-height: 1.4; }
.pager a:hover { border-color: var(--blu-bright); text-decoration: none; }
.pager span { display: block; font-size: 0.78rem; font-weight: 500; color: var(--txt2); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 2px; }
.pager .next { text-align: right; grid-column: 2; }
.try { display: flex; align-items: center; gap: 20px; padding: 20px 24px; border-radius: 12px; background: linear-gradient(135deg, rgba(35, 134, 54, 0.16), rgba(88, 166, 255, 0.08)); border: 1px solid rgba(63, 185, 80, 0.3); }
.try p { margin: 0; flex: 1; }
@media (max-width: 640px) { .try { flex-direction: column; align-items: flex-start; } }

/* Hub */
.hub { max-width: 1180px; margin: 0 auto; padding: 48px 16px 80px; }
.hero { text-align: center; max-width: 760px; margin: 0 auto 48px; }
.hero h1 { font-family: 'Outfit', sans-serif; font-weight: 800; color: var(--txt0); font-size: clamp(2.1rem, 6vw, 3.2rem); line-height: 1.1; letter-spacing: -0.03em; margin: 0 0 18px; }
.lead { font-size: 1.15rem; color: var(--txt1); margin: 0 0 8px; }
.cards { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 18px; }
.cards a { display: block; height: 100%; padding: 22px 24px; border: 1px solid var(--border); border-radius: 14px; background: var(--bg2); color: var(--txt1); transition: border-color 0.15s, transform 0.15s; }
.cards a:hover { border-color: var(--grn-bright); transform: translateY(-2px); text-decoration: none; }
.cards .num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--bg4); color: var(--grn-bright); font-weight: 700; font-size: 0.85rem; }
.cards h2 { font-family: 'Outfit', sans-serif; color: var(--txt0); font-size: 1.25rem; font-weight: 600; margin: 12px 0 6px; line-height: 1.25; }
.cards p { margin: 0; font-size: 0.95rem; line-height: 1.55; }
@media (max-width: 400px) { .cards { grid-template-columns: minmax(0, 1fr); } }

/* Footer */
.site-foot { border-top: 1px solid var(--border); background: var(--bg2); padding: 40px max(16px, calc((100vw - 1180px) / 2)); font-size: 0.9rem; }
.foot-cols { display: flex; flex-wrap: wrap; gap: 48px; justify-content: space-between; }
.foot-cols p { max-width: 320px; color: var(--txt2); }
.site-foot h4 { color: var(--txt0); margin: 0 0 10px; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; }
.site-foot ul { list-style: none; margin: 0; padding: 0; columns: 2; column-gap: 32px; }
.site-foot li { margin: 0 0 6px; }
.site-foot li a { color: var(--txt1); }
@media (max-width: 640px) { .site-foot ul { columns: 1; } }
figure.board .try-link { display: inline-block; margin-top: 4px; font-weight: 600; }