:root {
  --paper: #fafbfd;
  --ink: #16213e;
  --muted: #55617a;
  --rule: #c3d0e6;
  --margin: #e6aeb0;
  --link: #1b47b0;
  --mark: #ffe45c;
  --serif: Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}

.page {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 2rem;
}

header.site h1,
h2 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

header.site h1 { font-size: clamp(2rem, 6vw, 2.75rem); margin: 0 0 0.5rem; }
header.site p { margin: 0 0 2.5rem; color: var(--muted); max-width: 34rem; }

h2 { font-size: 1.5rem; margin: 2.5rem 0 0.75rem; }

/* Heftrand: der rosa Rand links wie im Schulheft */
main {
  border-left: 2px solid var(--margin);
  padding-left: 1.25rem;
}

a { color: var(--link); text-underline-offset: 0.2em; }
a:hover { background: var(--mark); color: var(--ink); }
a:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; background: var(--mark); color: var(--ink); }

/* Liste der Lernaktivitäten – wie linierte Zeilen */
.activities { list-style: none; margin: 0; padding: 0; }
.activities li { border-bottom: 1px solid var(--rule); padding: 1rem 0 1.1rem; }
.activities li:first-child { border-top: 1px solid var(--rule); }
.activities a.title {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration-thickness: 2px;
}
.activities .desc { margin: 0.25rem 0 0; }
.activities .meta { margin: 0.25rem 0 0; font-size: 0.9375rem; color: var(--muted); }

/* Platzhalter, die noch ersetzt werden müssen */
mark { background: var(--mark); color: var(--ink); padding: 0 0.2em; }

/* Impressum-Text */
.legal p, .legal address { margin: 0 0 1rem; max-width: 40rem; }
.legal address { font-style: normal; }
.legal h2 { font-size: 1.2rem; margin-top: 2rem; }

footer.site {
  margin-top: 3.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.9375rem;
  color: var(--muted);
}
footer.site a { margin-right: 1rem; }

@media (max-width: 30rem) {
  .page { padding-top: 2rem; }
  main { padding-left: 0.875rem; }
}

/* Navigation und Einleitung */
.crumbs { font-size: 0.9375rem; color: var(--muted); margin-bottom: 1.5rem; }
.crumbs span { margin: 0 0.5em; }

header.site p.lead {
  font-family: var(--serif);
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--ink);
  max-width: 36rem;
}

/* Nummerierte Liste: Reihenfolge nach Schwierigkeit */
.steps { counter-reset: step; }
.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  column-gap: 0.25rem;
}
.steps li::before {
  content: counter(step);
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--muted);
}

.note { margin: 0 0 1.25rem; max-width: 36rem; color: var(--muted); }

/* Hauptmenü */
.menu {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  margin: 0 0 2.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--rule);
  font-size: 1.0625rem;
}
.menu a {
  color: var(--ink);
  text-decoration: none;
  padding: 0.125rem 0;
  border-bottom: 3px solid transparent;
}
.menu a:hover { background: var(--mark); }
.menu a[aria-current] { font-weight: 700; border-bottom-color: var(--ink); }

@media (max-width: 30rem) {
  .menu { gap: 0.25rem 0.875rem; font-size: 0.9375rem; }
}

main > h2:first-child { margin-top: 0; }

/* Submenus in the main menu */
.menu .has-sub { position: relative; display: inline-flex; align-items: center; gap: 0.1rem; }
.sub-toggle {
  font: inherit;
  font-size: 0.85rem;
  line-height: 1;
  padding: 0.3rem 0.4rem;
  margin: 0;
  background: none;
  border: 0;
  border-radius: 3px;
  color: var(--ink);
  cursor: pointer;
}
.sub-toggle:hover { background: var(--mark); }
.sub-toggle:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }
.sub-toggle::before { content: "▾"; }
.has-sub.open .sub-toggle::before { content: "▴"; }
.menu .sub {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 30;
  min-width: 14rem;
  padding: 0.5rem 0.4rem;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--ink);
  box-shadow: 0 6px 16px rgba(22, 33, 62, 0.15);
}
.menu .has-sub.open .sub { display: block; }
@media (hover: hover) {
  .menu .has-sub:hover .sub { display: block; }
}
.menu .sub a {
  display: block;
  padding: 0.3rem 0.6rem;
  border-bottom: 0;
  font-size: 1rem;
  white-space: nowrap;
}
.menu .sub a[aria-current] { font-weight: 700; text-decoration: underline; text-underline-offset: 0.2em; }
.menu .sub .sub-h {
  margin: 0.35rem 0.6rem 0.1rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
.menu .sub .sub-h:first-child { margin-top: 0.1rem; }
@media (max-width: 40rem) {
  .menu .has-sub { flex-wrap: wrap; }
  .menu .sub { position: static; flex-basis: 100%; min-width: 0; box-shadow: none; margin: 0.25rem 0 0.5rem; }
  .menu .has-sub:hover .sub { display: none; }
  .menu .has-sub.open .sub { display: block; }
}