/* Shared styles for /learn pages. Plain static CSS — these pages do not use the homepage's dc-runtime. */
:root {
  --ink: #0B0B0C;
  --paper: #ECECF1;
  --violet: #5B46E5;
  --violet-soft: #7C6BFF;
  --body: #3A3A42;
  --muted: #5C5C66;
  --line: rgba(11, 11, 12, 0.16);
  --card: rgba(255, 255, 255, 0.62);
  --gutter: clamp(16px, 5vw, 56px);        /* matches homepage section padding */
  --bar-inset: clamp(14px, 3vw, 34px);     /* matches homepage top bar inset */
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --display: 'Anton', 'Arial Narrow', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Archivo', system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(60% 45% at 50% 0%, rgba(163, 150, 255, 0.26), transparent 70%),
    radial-gradient(45% 40% at 90% 80%, rgba(255, 196, 232, 0.2), transparent 72%);
}
a { color: var(--violet); text-underline-offset: 3px; }
a:hover { color: var(--ink); }
img { max-width: 100%; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: 14px;
  z-index: 50;
  margin: 14px var(--bar-inset) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px clamp(16px, 2.2vw, 26px);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  background: linear-gradient(140deg, rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0.4) 46%, rgba(255, 255, 255, 0.6));
  backdrop-filter: blur(22px) saturate(180%);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  box-shadow: 0 8px 32px rgba(11, 11, 12, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.85);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--display);
  font-size: 19px;
  letter-spacing: 0.01em;
  text-transform: none;
  white-space: nowrap;
}
.brand img { width: 26px; height: 28px; object-fit: contain; }
.brand em { font-family: 'Archivo', sans-serif; font-weight: 400; font-size: 13px; color: var(--muted); }
.topbar nav { display: flex; align-items: center; gap: 18px; white-space: nowrap; }
.topbar nav a { color: var(--ink); text-decoration: none; }
.topbar nav a:hover, .topbar nav a[aria-current] { color: var(--violet); }
.topbar .launch {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid rgba(91, 70, 229, 0.4);
  background: rgba(91, 70, 229, 0.14);
  color: var(--violet);
}
@media (max-width: 560px) {
  .topbar nav { gap: 10px; font-size: 9px; }
  .topbar nav .opt { display: none; }
}
@media (max-width: 400px) {
  .topbar { padding-left: 14px; padding-right: 10px; }
  .brand { font-size: 17px; gap: 7px; }
  .brand img { width: 22px; height: 24px; }
  .brand em { display: none; }
  .topbar .launch { padding: 7px 12px; }
}

/* ---------- Layout ---------- */
.wrap { max-width: calc(1320px + 2 * var(--gutter)); margin: 0 auto; padding: 0 var(--gutter); }
.article-head { max-width: 1000px; }

/* Article body + sticky table of contents on wide screens */
.layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(32px, 5vw, 72px); }
@media (min-width: 1000px) {
  .layout { grid-template-columns: minmax(0, 1fr) 280px; }
}
.toc { display: none; }
@media (min-width: 1000px) {
  .toc {
    display: block;
    position: sticky;
    top: 110px;
    align-self: start;
    margin-top: clamp(36px, 5vw, 56px);
    padding: 22px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: var(--card);
  }
}
.toc ol { list-style: none; margin: 12px 0 0; padding: 0; }
.toc li { border-top: 1px solid var(--line); }
.toc a { display: block; padding: 10px 0; color: var(--body); text-decoration: none; font-size: 15px; line-height: 1.4; }
.toc a:hover { color: var(--violet); }
.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.crumbs { margin: clamp(40px, 7vw, 80px) 0 18px; }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.crumbs li + li::before { content: "/"; margin-right: 8px; color: rgba(11, 11, 12, 0.35); }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--violet); }

h1, h2, h3 { font-family: var(--display); font-weight: 400; text-transform: uppercase; margin: 0; }
h1 { font-size: clamp(34px, 6vw, 72px); line-height: 1.02; text-wrap: balance; }
.lede { margin: 20px 0 0; font-size: clamp(18px, 2vw, 20px); line-height: 1.6; color: var(--body); text-wrap: pretty; }
.meta { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 6px 18px; }

/* ---------- Article body ---------- */
.article { padding-bottom: clamp(56px, 8vw, 110px); }
.prose { margin-top: clamp(36px, 5vw, 56px); color: var(--body); }
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  margin-top: 2.2em;
  color: var(--ink);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.1;
  letter-spacing: 0.03em;
  scroll-margin-top: 100px;
}
.prose h3 {
  margin-top: 1.8em;
  color: var(--ink);
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.2;
  letter-spacing: 0.04em;
}
.prose p, .prose li { text-wrap: pretty; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.45em; }
.prose strong { color: var(--ink); }
.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
  padding: 2px 6px;
  border-radius: 6px;
  background: rgba(11, 11, 12, 0.06);
}

.tldr {
  padding: clamp(22px, 3vw, 32px);
  border-radius: 18px;
  background: var(--ink);
  color: var(--paper);
}
.tldr .eyebrow { color: #B3A9FF; }
.tldr ul { margin: 12px 0 0; padding-left: 1.2em; }
.tldr strong { color: #fff; }

.note {
  padding: 18px 22px;
  border-radius: 14px;
  border: 1px solid rgba(91, 70, 229, 0.35);
  background: rgba(91, 70, 229, 0.08);
}

/* Can / cannot comparison — mirrors the homepage custody block */
.can-cannot {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
}
.can-cannot > div { padding: clamp(22px, 3vw, 32px); }
.can-cannot .can { background: rgba(255, 255, 255, 0.7); }
.can-cannot .cannot { background: var(--ink); color: var(--paper); }
.can-cannot h3 { margin: 0 0 8px; font-size: clamp(20px, 2.4vw, 28px); letter-spacing: 0.05em; color: inherit; }
.can-cannot ul { list-style: none; margin: 0; padding: 0; }
.can-cannot li { display: flex; gap: 12px; align-items: flex-start; padding: 12px 0; border-top: 1px solid var(--line); line-height: 1.45; }
.can-cannot .cannot li { border-top-color: rgba(236, 236, 241, 0.18); }
.can-cannot li + li { margin-top: 0; }
.can-cannot li::before {
  flex: 0 0 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 13px;
}
.can-cannot .can li::before { content: "✓"; background: var(--violet); color: var(--paper); }
.can-cannot .cannot li::before { content: "✕"; border: 1.5px solid var(--paper); }

.steps { list-style: none; padding: 0; counter-reset: step; }
.steps li {
  counter-increment: step;
  position: relative;
  padding: 18px 20px 18px 64px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--card);
}
.steps li + li { margin-top: 10px; }
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 22px;
  top: 12px;
  font-family: var(--display);
  font-size: 30px;
  color: var(--violet);
}

.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq details + details { margin-top: 0; }
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  font-family: var(--display);
  font-size: clamp(17px, 1.9vw, 21px);
  line-height: 1.25;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); color: var(--violet); }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 18px; }

.cta {
  margin-top: clamp(48px, 6vw, 72px);
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  padding: clamp(24px, 3vw, 38px);
  border-radius: 20px;
  background: var(--ink);
  color: var(--paper);
}
.cta h2 { font-size: clamp(24px, 3vw, 38px); line-height: 1.08; letter-spacing: 0.04em; }
.btn {
  display: inline-block;
  padding: 15px 28px;
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
}
.btn:hover { background: var(--violet-soft); color: var(--paper); }

.disclaimer { margin-top: 28px; font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em; text-transform: uppercase; color: #68686E; }

/* ---------- Hub + related cards ---------- */
.hub-head { padding-bottom: clamp(28px, 4vw, 44px); }
.section-title { margin: clamp(36px, 5vw, 56px) 0 16px; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: clamp(14px, 2vw, 22px);
}
.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 2.6vw, 30px);
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover { color: var(--ink); border-color: var(--violet); transform: translateY(-2px); }
.card .tag { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--violet); }
.card h3 { font-size: clamp(20px, 2.2vw, 26px); line-height: 1.12; letter-spacing: 0.04em; }
.card p { margin: 0; font-size: 15.5px; line-height: 1.55; color: var(--body); }
.card .more { margin-top: auto; font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.empty { padding: 22px; border-radius: 18px; border: 1px dashed rgba(11, 11, 12, 0.3); color: var(--muted); font-size: 15.5px; }

/* ---------- Footer ---------- */
.site-footer { padding: 28px 0 48px; }
.site-footer .wrap {
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #68686E;
}
.site-footer a { color: inherit; text-decoration: none; }
.site-footer a:hover { color: var(--violet); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .card { transition: none; }
}