/* ============================================================
   Landing page
   ------------------------------------------------------------
   The masthead, the palette and the type are NOT defined here — they
   come from assets/component-shell.css, which every component loads
   too. That is what keeps the landing page and the sub-sites looking
   like one site. This file only styles what is unique to the landing
   page: hero, cards, call-to-action and footer.
   ============================================================ */
:root {
  color-scheme: light;
  --ink: var(--pxp-ink);
  --ink-soft: var(--pxp-ink-soft);
  --paper: var(--pxp-paper);
  --surface: var(--pxp-surface);
  --line: var(--pxp-line);
  --green: var(--pxp-green);
  --green-soft: var(--pxp-green-soft);
  --blue: var(--pxp-blue);
  --blue-soft: var(--pxp-blue-soft);
  --gold: var(--pxp-gold);
  --gold-soft: var(--pxp-gold-soft);
  --purple: var(--pxp-purple);
  --purple-soft: var(--pxp-purple-soft);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--pxp-font);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 9px 13px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

main,
.site-footer {
  width: min(var(--pxp-rail), calc(100% - 40px));
  margin-inline: auto;
}

.hero {
  max-width: 760px;
  padding: 50px 0 38px;
}
.eyebrow,
.section-label {
  margin: 0 0 9px;
  color: var(--green);
  font-size: 0.74rem;
  font-weight: 820;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2.8rem, 6vw, 4.6rem);
  font-weight: 820;
  line-height: 1;
  letter-spacing: -0.055em;
}
.hero-intro {
  margin: 17px 0 0;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.learning-section {
  padding: 30px 0 34px;
  border-top: 1px solid var(--line);
}
.learning-section:last-of-type { padding-bottom: 38px; }
.section-heading {
  margin-bottom: 18px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}
.section-heading h2 {
  margin: 0;
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}
.section-heading > p {
  margin: 0 0 2px;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
/* a group with one or two tools should not leave a hole in the row */
.card-grid[data-count="1"] { grid-template-columns: minmax(0, 1fr); }
.card-grid[data-count="2"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card-grid[data-count="1"] .learning-card { min-height: 150px; }
.card-grid[data-count="1"] .learning-card .card-description { max-width: 52ch; }
.learning-card {
  --card-accent: var(--green);
  --card-soft: var(--green-soft);
  min-height: 220px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(18, 56, 91, 0.11);
  border-radius: 16px;
  background: var(--surface);
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
.learning-card[data-accent="blue"] {
  --card-accent: var(--blue);
  --card-soft: var(--blue-soft);
}
.learning-card[data-accent="gold"] {
  --card-accent: var(--gold);
  --card-soft: var(--gold-soft);
}
.learning-card[data-accent="purple"] {
  --card-accent: var(--purple);
  --card-soft: var(--purple-soft);
}
.learning-card:hover,
.learning-card:focus-visible {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--card-accent) 38%, white);
  box-shadow: 0 12px 30px rgba(18, 56, 91, 0.08);
}
.learning-card:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--card-accent) 42%, white);
  outline-offset: 3px;
}
.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.subject-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: var(--card-soft);
  color: var(--card-accent);
}
.subject-icon svg {
  width: 22px;
  height: 22px;
}
.card-meta {
  color: var(--card-accent);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-align: right;
  text-transform: uppercase;
}
.learning-card h3 {
  margin: 18px 0 0;
  font-size: 1.35rem;
  line-height: 1.12;
  letter-spacing: -0.025em;
}
.card-description {
  margin: 9px 0 18px;
  color: var(--ink-soft);
  font-size: 0.88rem;
}
.card-action {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--card-accent);
  font-size: 0.86rem;
  font-weight: 780;
}
.card-action::after {
  content: "→";
  transition: transform 160ms ease;
}
.learning-card:hover .card-action::after { transform: translateX(4px); }

/* announcement strip under a group's cards — the text comes from
   `note` on that group in platform.config.json */
.section-note {
  margin: 14px 0 0;
  padding: 13px 18px;
  display: flex;
  align-items: center;
  gap: 11px;
  border: 1px dashed color-mix(in srgb, var(--green) 40%, white);
  border-radius: 14px;
  background: var(--green-soft);
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 700;
}
.section-note-mark {
  flex: none;
  display: inline-flex;
  color: var(--green);
}
.section-note-mark svg {
  width: 19px;
  height: 19px;
  display: block;
}

.papers-cta {
  margin: 0 0 34px;
  padding: 19px 21px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.62);
}
.papers-cta h2 {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}
.papers-cta p {
  margin: 3px 0 0;
  color: var(--ink-soft);
  font-size: 0.86rem;
}
.papers-cta a {
  flex: none;
  color: var(--green);
  font-size: 0.88rem;
  font-weight: 780;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

/* Site disclosure.
   Deliberately calm: a hairline rule and quiet type — the visual language
   of a colophon, not a warning box. No alert colour, no warning icon, no
   collapsing. The text stays fully visible and passes AA contrast (5.3:1);
   only its visual weight is dialled down, never its availability. */
.site-disclosure {
  margin: 4px 0 0;
  padding: 24px 0 16px;
  border-top: 1px solid var(--line);
}
.site-disclosure h2 {
  margin: 0 0 9px;
  color: var(--ink-soft);
  font-size: 0.69rem;
  font-weight: 820;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
.site-disclosure p {
  margin: 0;
  max-width: 92ch;
  color: var(--ink-soft);
  font-size: 0.845rem;
  line-height: 1.62;
}
.site-disclosure p + p { margin-top: 9px; }

.site-footer {
  padding: 21px 0 30px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.78rem;
}
.site-footer p { margin: 0; }
.footer-main {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
}
.footer-links a {
  color: var(--ink-soft);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.footer-links a:hover,
.footer-links a:focus-visible { color: var(--ink); }
.footer-copyright {
  margin-top: 12px;
  font-size: 0.74rem;
  color: color-mix(in srgb, var(--ink-soft) 82%, white);
}

/* ---------- platform-owned pages (privacy, terms) ---------- */
.legal-page {
  width: min(var(--pxp-rail), calc(100% - 40px));
  margin-inline: auto;
  padding: 8px 0 46px;
}
.legal-head { padding: 34px 0 10px; }
.legal-eyebrow {
  margin: 0 0 9px;
  color: var(--green);
  font-size: 0.72rem;
  font-weight: 820;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
.legal-page h1 {
  margin: 0;
  max-width: 20ch;
  font-size: clamp(2.1rem, 4.5vw, 3.1rem);
  font-weight: 820;
  line-height: 1.04;
  letter-spacing: -0.04em;
}
.legal-meta {
  margin: 14px 0 0;
  color: var(--ink-soft);
  font-size: 0.84rem;
}
/* the plain-language précis at the top of each document */
.legal-summary {
  margin: 26px 0 8px;
  padding: 20px 22px;
  border: 1px solid rgba(18, 56, 91, 0.11);
  border-radius: 16px;
  background: var(--surface);
}
.legal-summary h2 {
  margin: 0 0 8px;
  font-size: 0.72rem;
  font-weight: 820;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border: 0;
  padding: 0;
}
.legal-summary p {
  margin: 0;
  max-width: 76ch;
  font-size: 0.96rem;
  line-height: 1.62;
}
.legal-page h2 {
  margin: 34px 0 10px;
  font-size: 1.16rem;
  font-weight: 780;
  letter-spacing: -0.02em;
}
.legal-page h3 {
  margin: 22px 0 8px;
  font-size: 0.98rem;
  font-weight: 760;
  letter-spacing: -0.01em;
}
/* A clause the reader must not be able to miss. The Consumer Protection Act
   requires a limitation of liability to be drawn conspicuously to the
   consumer's attention in plain language — a clause buried in body text can
   be struck out. Hence the box, not decoration. */
.legal-callout {
  margin: 34px 0 8px;
  padding: 22px 24px 8px;
  border: 1px solid color-mix(in srgb, var(--gold) 34%, white);
  border-left: 3px solid var(--gold);
  border-radius: 14px;
  background: var(--gold-soft);
}
.legal-callout h2 { margin-top: 0; }
.legal-callout p,
.legal-callout li { color: color-mix(in srgb, var(--ink) 82%, var(--ink-soft)); }
.legal-page p,
.legal-page li {
  max-width: 76ch;
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.68;
}
.legal-page p { margin: 0 0 12px; }
.legal-page ul {
  margin: 0 0 14px;
  padding-left: 20px;
}
.legal-page li { margin-bottom: 9px; }
.legal-page strong { color: var(--ink); }
.legal-page a { color: var(--green); text-underline-offset: 3px; }
.legal-page code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--surface);
  border: 1px solid var(--line);
  font-size: 0.86em;
}

@media (max-width: 820px) {
  .card-grid,
  .card-grid[data-count="2"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .card-grid[data-count="1"] { grid-template-columns: minmax(0, 1fr); }
  /* an odd trailing card fills the row instead of leaving a gap */
  .card-grid:not([data-count="1"]) .learning-card:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    min-height: 190px;
  }
}

@media (max-width: 600px) {
  main,
  .site-footer {
    width: min(100% - 28px, var(--pxp-rail));
  }
  .hero { padding: 34px 0 28px; }
  .hero h1 { font-size: clamp(2.45rem, 12vw, 3.45rem); }
  .hero-intro { margin-top: 13px; font-size: 0.98rem; }
  .learning-section { padding: 24px 0 30px; }
  .section-heading {
    margin-bottom: 14px;
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }
  .card-grid,
  .card-grid[data-count="1"],
  .card-grid[data-count="2"] { grid-template-columns: 1fr; gap: 10px; }
  .learning-card,
  .card-grid:not([data-count="1"]) .learning-card:last-child:nth-child(odd) {
    min-height: 165px;
    grid-column: auto;
    padding: 17px;
  }
  .learning-card h3 { margin-top: 14px; font-size: 1.22rem; }
  .card-description { margin: 7px 0 13px; }
  .section-note {
    margin-top: 10px;
    padding: 12px 14px;
    align-items: flex-start;
    font-size: 0.85rem;
  }
  .subject-icon { width: 38px; height: 38px; }
  .papers-cta {
    margin-bottom: 27px;
    padding: 16px;
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }
  .site-disclosure { padding-top: 20px; }
  .site-disclosure p { font-size: 0.82rem; }
  .site-footer { padding-top: 18px; }
  .footer-main { flex-direction: column; gap: 9px; }
  .legal-page { width: min(100% - 28px, var(--pxp-rail)); }
  .legal-head { padding-top: 24px; }
  .legal-summary { padding: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}