/*
 * CurioXL's public lesson pages. Served as /learn.css.
 *
 * System fonts only: a web font from a third-party CDN logs every child who
 * loads the page (non-negotiable 2), and a self-hosted one costs a download on
 * the phones children actually have. Everything here holds on Safari 14.1.
 */

:root {
  --purple: #5B21B6;
  --amber: #F9B215;
  --ink: #1F1B2E;
  --text-secondary: #5B5670;
  --surface-border: #E7E3F3;
  --page: #FBFAFF;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 18px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--purple); }

.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; background: #fff; border-bottom: 1px solid var(--surface-border);
}
.brand {
  display: inline-flex; align-items: center; gap: 10px; min-height: 44px;
  font-weight: 800; letter-spacing: -0.03em; font-size: 22px; color: var(--ink); text-decoration: none;
}
.top .cta { margin: 0; font-size: 16px; padding: 10px 16px; }

main { max-width: 760px; margin: 0 auto; padding: 20px 16px 64px; }

.crumbs { font-size: 15px; color: var(--text-secondary); }
.crumbs a { display: inline-block; min-height: 44px; line-height: 44px; }

h1 { font-size: 34px; line-height: 1.2; letter-spacing: -0.01em; margin: 8px 0 12px; }
h2 { font-size: 23px; line-height: 1.3; margin: 32px 0 10px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 20px; padding: 0; list-style: none; }
.chip {
  padding: 4px 12px; border-radius: 999px; font-size: 15px; font-weight: 600;
  background: #fff; border: 1px solid var(--surface-border);
}
.chip.subject { color: #fff; border-color: transparent; }

.objectives { background: #fff; border: 1px solid var(--surface-border); border-radius: 16px; padding: 4px 20px; }
.objectives h2 { margin-top: 14px; font-size: 19px; }
.objectives ul { padding-left: 20px; }

.cta {
  display: inline-block; margin: 20px 0 6px; padding: 14px 22px; min-height: 48px;
  border-radius: 12px; background: var(--purple); color: #fff; font-weight: 700;
  text-decoration: none;
}
.cta:hover { filter: brightness(1.1); }
.cta-note { font-size: 15px; color: var(--text-secondary); margin: 0 0 8px; }

.part p { margin: 0 0 14px; }
.part figure { max-width: 640px; }

.again {
  margin-top: 40px; padding: 20px; border-radius: 16px;
  background: #F5F3FF; border: 2px solid var(--purple);
}
.again p { margin: 0; }

.pager { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 32px; }
.pager a { display: inline-block; min-height: 44px; padding: 10px 0; }

.standards { margin-top: 28px; font-size: 14px; color: var(--text-secondary); }

.list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.list a {
  display: block; min-height: 48px; padding: 12px 16px; border-radius: 12px;
  background: #fff; border: 1px solid var(--surface-border); text-decoration: none; color: var(--ink);
}
.list a:hover { border-color: var(--purple); }
.list small { display: block; color: var(--text-secondary); font-size: 14px; }

.subjects { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 20px 0; }
.subjects a {
  display: block; padding: 18px 20px; border-radius: 16px; color: #fff; text-decoration: none;
  font-weight: 800; font-size: 22px;
}
.subjects small { display: block; font-weight: 500; font-size: 15px; opacity: .92; }

.foot {
  max-width: 760px; margin: 0 auto; padding: 24px 16px 40px;
  border-top: 1px solid var(--surface-border); font-size: 14px; color: var(--text-secondary);
}

@media (max-width: 560px) {
  body { font-size: 17px; }
  h1 { font-size: 28px; }
  h2 { font-size: 21px; }
  .brand span { display: none; }
}