/* Shared styles for the /learn AEO content cluster.
   Clones the design tokens from public/terms.html (dark #09090b / emerald
   #10b981, 760px wrap, header/footer borders) and adds content-block styles:
   .lead, .def (definition), .faq, table.data, .cards. Single source for all
   four pages (learn.html + learn/*.html). */

:root { color-scheme: dark; }
* { box-sizing: border-box; }
html, body { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: #09090b;
  color: #d4d4d8;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.7;
  font-size: 16px;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 2rem 1.25rem 5rem; }

header.site {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding-bottom: 1.25rem; margin-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.08); flex-wrap: wrap;
}
.brand { font-weight: 800; letter-spacing: -0.02em; font-size: 1.05rem; color: #fff; text-decoration: none; }
.brand span { color: #10b981; }
.back {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.15em; color: #71717a;
  text-decoration: none; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.back:hover { color: #10b981; }

h1 { color: #fff; font-size: 1.85rem; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 0.5rem; }
.updated { color: #71717a; font-size: 0.85rem; margin: 0 0 0.25rem; }
.byline { color: #a1a1aa; font-size: 0.9rem; margin: 0 0 1.5rem; }
.byline strong { color: #e4e4e7; }
.intro { color: #a1a1aa; }

.lead {
  color: #e4e4e7; font-size: 1.05rem;
  border-left: 2px solid #10b981; padding-left: 1rem; margin: 1.5rem 0;
}

h2 { color: #fff; font-size: 1.3rem; margin: 2.5rem 0 0.6rem; letter-spacing: -0.01em; }
h3 { color: #e4e4e7; font-size: 1.05rem; margin: 1.5rem 0 0.4rem; }
p, li { color: #d4d4d8; }
a { color: #34d399; }
strong { color: #fff; }
em { color: #e4e4e7; font-style: italic; }
ul, ol { padding-left: 1.25rem; margin: 0.5rem 0; }
li { margin-bottom: 0.4rem; }

.callout {
  border: 1px solid rgba(16,185,129,0.25); background: rgba(16,185,129,0.06);
  border-radius: 12px; padding: 0.85rem 1rem; margin: 1.5rem 0;
}

.def { border-left: 2px solid rgba(16,185,129,0.4); padding: 0.1rem 0 0.1rem 1rem; margin: 1.1rem 0; }
.def strong { color: #fff; }

.faq { margin: 1.25rem 0; }
.faq .q { color: #fff; font-weight: 600; margin: 1.25rem 0 0.2rem; }
.faq .a { color: #d4d4d8; margin: 0; }

.table-scroll { overflow-x: auto; margin: 1.25rem 0; -webkit-overflow-scrolling: touch; }
table.data { border-collapse: collapse; width: 100%; font-size: 0.92rem; min-width: 460px; }
table.data caption { caption-side: bottom; color: #71717a; font-size: 0.8rem; text-align: left; margin-top: 0.5rem; font-style: italic; }
table.data th, table.data td { text-align: left; padding: 0.55rem 0.75rem; border-bottom: 1px solid rgba(255,255,255,0.08); }
table.data thead th { color: #34d399; font-weight: 600; border-bottom: 1px solid rgba(16,185,129,0.3); white-space: nowrap; }
table.data tbody tr:nth-child(odd) { background: rgba(255,255,255,0.02); }

.cards { display: grid; gap: 1rem; margin: 1.75rem 0; }
.card {
  border: 1px solid rgba(255,255,255,0.08); border-radius: 12px; padding: 1.1rem 1.25rem;
  text-decoration: none; display: block; transition: border-color 0.15s, background 0.15s;
}
.card:hover { border-color: rgba(16,185,129,0.4); background: rgba(16,185,129,0.04); }
.card h2 { font-size: 1.1rem; margin: 0 0 0.35rem; color: #fff; }
.card p { margin: 0; color: #a1a1aa; font-size: 0.95rem; }

.source { color: #71717a; font-size: 0.82rem; font-style: italic; }
.crosslinks { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid rgba(255,255,255,0.08); font-size: 0.9rem; color: #a1a1aa; }

footer.site {
  margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.08);
  color: #71717a; font-size: 0.82rem; display: flex; gap: 1rem; flex-wrap: wrap; justify-content: space-between;
}
footer.site a { color: #71717a; text-decoration: none; }
footer.site a:hover { color: #10b981; }