/* The public pages — About, Contact, Privacy, Terms. Plain HTML that search
   engines can read, styled to match the app. */
:root { --bg: #f6f7f9; --card: #fff; --ink: #18202b; --ink-2: #3d4756; --ink-3: #6b7685; --line: #e3e7ee; --accent: #16a34a; }
@media (prefers-color-scheme: dark) { :root { --bg: #0f1419; --card: #171d24; --ink: #e8edf3; --ink-2: #c3ccd7; --ink-3: #8b97a6; --line: #26303b; --accent: #34c26a; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
.site-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 20px; border-bottom: 1px solid var(--line); background: var(--card); position: sticky; top: 0; }
.site-brand { font-weight: 800; color: var(--ink); text-decoration: none; font-size: 18px; white-space: nowrap; }
.site-brand span { color: var(--accent); }
.site-top nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14.5px; }
.site-top nav a { color: var(--ink-2); text-decoration: none; }
.site-top nav a[aria-current="page"] { color: var(--accent); font-weight: 700; }
main { max-width: 780px; margin: 0 auto; padding: 28px 20px 40px; }
h1 { font-size: clamp(28px, 6vw, 38px); line-height: 1.15; margin: 8px 0 10px; }
h2 { font-size: 21px; margin: 30px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 6px; }
.lead { font-size: 18px; color: var(--ink-2); }
.updated { color: var(--ink-3); font-size: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; margin: 16px 0; }
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.grid .card { margin: 0; }
.cta { display: inline-block; background: var(--accent); color: #fff; padding: 12px 22px; border-radius: 12px; font-weight: 700; text-decoration: none; }
form { display: grid; gap: 12px; }
label { display: grid; gap: 4px; font-weight: 600; font-size: 14.5px; }
input, select, textarea { font: inherit; padding: 11px 13px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); }
textarea { min-height: 140px; resize: vertical; }
button { font: inherit; font-weight: 700; padding: 12px 22px; border: 0; border-radius: 12px; background: var(--accent); color: #fff; cursor: pointer; justify-self: start; }
.hp { position: absolute; left: -9999px; }
.note { padding: 12px 14px; border-radius: 12px; background: color-mix(in srgb, var(--accent) 10%, var(--card)); border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--line)); }
.err { color: #c0392b; }
.site-foot { border-top: 1px solid var(--line); padding: 20px; text-align: center; font-size: 14px; color: var(--ink-3); }
.site-foot nav { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 6px; }
.site-foot a { color: var(--ink-2); }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }

/* course and lesson pages (scripts/build-seo.mjs) */
.crumbs { font-size: 13.5px; color: var(--ink-3); margin-bottom: 6px; }
.crumbs a { color: var(--ink-3); }
.kicker { text-transform: uppercase; letter-spacing: .08em; font-size: 12.5px; font-weight: 700; color: var(--ink-3); margin: 10px 0 0; }
.terms { width: 100%; border-collapse: collapse; margin: 8px 0; }
.terms th, .terms td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.terms th { width: 40%; font-weight: 700; }
.q ol { margin: 6px 0; }
.q details summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.chapters li { margin: 0 0 12px; }
.chapters span { color: var(--ink-2); font-size: 15px; }
.pn { display: flex; justify-content: space-between; gap: 12px; margin: 26px 0 10px; font-size: 15px; }
.grid a.card { color: var(--ink); text-decoration: none; display: block; }
.grid a.card small { color: var(--ink-3); }
.site-foot { max-width: 780px; margin: 0 auto; padding: 20px; color: var(--ink-3); font-size: 14px; }
pre { overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px; }
.gls { margin: 14px 0; padding: 12px 14px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.gls dl, .gls-list { margin: 6px 0 0; display: grid; grid-template-columns: minmax(110px, 40%) 1fr; gap: 6px 12px; }
.gls dt { font-weight: 700; } .gls dd { margin: 0; color: var(--ink-2); }