/* Public pages for search engines (course pages, alphabet, vocabulary,
   worksheet overview), built by scripts/build-pages.mjs. */
:root {
  --s-bg: #f6f5f2;
  --s-card: #fff;
  --s-ink: #1b1d24;
  --s-muted: #5d6270;
  --s-line: #e2ded4;
  --s-accent: #2f5fd0;
  --s-accent-ink: #2a51c0;
  --s-accent-soft: #e6ecfb;
  --s-on-accent: #fff;
  --s-warn-soft: #fff1dc;
  --s-warn-ink: #8a4b00;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --s-bg: #14161c;
    --s-card: #1d2029;
    --s-ink: #eceef3;
    --s-muted: #a3a8b6;
    --s-line: #2e3240;
    --s-accent: #7b9cff;
    --s-accent-ink: #9db5ff;
    --s-accent-soft: #252f4d;
    --s-on-accent: #0d1222;
    --s-warn-soft: #3a2a12;
    --s-warn-ink: #ffc777;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--s-bg); color: var(--s-ink); font: 17px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; -webkit-text-size-adjust: 100%; }
a { color: var(--s-accent-ink); }
.s-top { max-width: 980px; margin: 0 auto; padding: 14px 16px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.s-logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.15rem; color: var(--s-ink); text-decoration: none; }
.s-logo img { width: 32px; height: 32px; }
.s-topnav { display: flex; align-items: center; gap: 6px; }
.s-lang { padding: 8px 10px; font-weight: 700; font-size: .92rem; text-decoration: none; }
.s-top .s-btn { white-space: nowrap; }
@media (max-width: 400px) {
  .s-top { padding-left: 12px; padding-right: 12px; gap: 6px; }
  .s-logo { gap: 8px; font-size: 1.05rem; }
  .s-logo img { width: 28px; height: 28px; }
  .s-lang { padding: 8px 4px; font-size: .88rem; }
  .s-top .s-btn.small { padding: 8px 10px; font-size: .86rem; }
}
.s-btn { display: inline-block; font: inherit; font-weight: 700; padding: 11px 20px; border-radius: 14px; border: 1.5px solid var(--s-accent); background: var(--s-accent); color: var(--s-on-accent); text-decoration: none; text-align: center; }
.s-btn.light { background: transparent; color: var(--s-accent-ink); }
.s-btn.small { padding: 8px 14px; font-size: .92rem; }
.s-wrap { max-width: 980px; margin: 0 auto; padding: 0 16px 48px; }
.s-hero { padding: 18px 0 8px; }
.s-kicker { margin: 0 0 6px; font-weight: 700; font-size: .85rem; letter-spacing: .06em; text-transform: uppercase; color: var(--s-accent-ink); }
.s-hero h1 { font-size: clamp(1.8rem, 5vw, 2.6rem); line-height: 1.15; margin: 0 0 12px; letter-spacing: -.01em; }
.s-lead { font-size: 1.12rem; color: var(--s-muted); margin: 0 0 18px; max-width: 46em; }
.s-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 8px; }
.s-note { margin: 4px 0 0; font-size: .92rem; color: var(--s-muted); }
.s-sec { margin: 34px 0 0; }
.s-sec > h2 { font-size: 1.45rem; margin: 0 0 6px; }
.s-sec > p { margin: 0 0 12px; color: var(--s-muted); max-width: 46em; }
.s-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.s-card { background: var(--s-card); border: 1px solid var(--s-line); border-radius: 16px; padding: 16px; }
.s-card h3 { margin: 0 0 4px; font-size: 1.05rem; }
.s-card p { margin: 0; color: var(--s-muted); font-size: .95rem; }
.s-card .s-ico { font-size: 1.5rem; line-height: 1; display: block; margin-bottom: 8px; }
a.s-card.s-link { display: block; color: var(--s-ink); text-decoration: none; }
a.s-card.s-link h3 { color: var(--s-accent-ink); }
.s-steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.s-steps li { counter-increment: s; background: var(--s-card); border: 1px solid var(--s-line); border-radius: 16px; padding: 14px 16px 14px 56px; position: relative; }
.s-steps li::before { content: counter(s); position: absolute; left: 16px; top: 14px; width: 28px; height: 28px; border-radius: 50%; background: var(--s-accent-soft); color: var(--s-accent-ink); font-weight: 800; display: grid; place-items: center; }
.s-steps strong { display: block; }
.s-steps span { color: var(--s-muted); font-size: .95rem; }
.s-units { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; }
.s-units li { background: var(--s-card); border: 1px solid var(--s-line); border-radius: 12px; padding: 10px 12px; display: flex; gap: 10px; align-items: center; }
.s-units .n { color: var(--s-muted); font-size: .85rem; min-width: 1.6em; }
.s-letters { display: grid; grid-template-columns: repeat(auto-fill, minmax(52px, 1fr)); gap: 6px; }
.s-letters a, .s-letters span { display: grid; place-items: center; aspect-ratio: 1; background: var(--s-card); border: 1px solid var(--s-line); border-radius: 12px; font-size: 1.35rem; font-weight: 700; color: var(--s-ink); text-decoration: none; }
.s-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; background: var(--s-card); border: 1px solid var(--s-line); border-radius: 16px; }
table.s-table { width: 100%; border-collapse: collapse; font-size: .97rem; }
.s-table th, .s-table td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--s-line); vertical-align: top; }
.s-table tr:last-child td { border-bottom: 0; }
.s-table th { font-size: .82rem; text-transform: uppercase; letter-spacing: .05em; color: var(--s-muted); font-weight: 700; }
.s-table .big { font-size: 1.5rem; font-weight: 700; white-space: nowrap; }
.s-table .word { font-weight: 700; font-size: 1.05rem; }
.s-table .pron { color: var(--s-muted); font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .9rem; }
.s-tag { display: inline-block; margin-top: 4px; padding: 1px 8px; border-radius: 999px; background: var(--s-warn-soft); color: var(--s-warn-ink); font-size: .78rem; font-weight: 700; }
.s-toc { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 12px; padding: 0; list-style: none; }
.s-toc a { display: inline-block; padding: 6px 12px; border-radius: 999px; background: var(--s-card); border: 1px solid var(--s-line); text-decoration: none; font-weight: 600; font-size: .92rem; }
.s-topic { margin: 22px 0 0; scroll-margin-top: 12px; }
.s-topic h3 { margin: 0 0 8px; font-size: 1.15rem; }
.s-faq details { background: var(--s-card); border: 1px solid var(--s-line); border-radius: 14px; padding: 12px 16px; margin: 0 0 8px; }
.s-faq summary { font-weight: 700; cursor: pointer; }
.s-faq p { margin: 8px 0 0; color: var(--s-muted); }
.s-cta { margin: 40px 0 0; background: var(--s-accent-soft); border-radius: 20px; padding: 22px 20px; text-align: center; }
.s-cta h2 { margin: 0 0 6px; }
.s-cta p { margin: 0 0 14px; color: var(--s-muted); }
.s-cta .s-actions { justify-content: center; }
.s-foot { max-width: 980px; margin: 0 auto; padding: 22px 16px 40px; border-top: 1px solid var(--s-line); color: var(--s-muted); font-size: .9rem; }
.s-foot nav { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 0 0 8px; }
.s-foot a { color: var(--s-muted); }
@media (max-width: 640px) {
  /* Alphabet: one card-like row per letter instead of five columns */
  .s-alpha thead { display: none; }
  .s-alpha tr { display: grid; grid-template-columns: 64px max-content 1fr; grid-template-areas: "big nm tr" "big snd snd" "big ex ex"; gap: 2px 10px; padding: 12px; border-bottom: 1px solid var(--s-line); }
  .s-alpha tr:last-child { border-bottom: 0; }
  .s-table.s-alpha td { padding: 0; border: 0; }
  .s-alpha .big { grid-area: big; font-size: 1.8rem; }
  .s-alpha .nm { grid-area: nm; color: var(--s-muted); }
  .s-alpha .tr { grid-area: tr; color: var(--s-muted); }
  .s-alpha .tr::before { content: "· "; }
  .s-alpha .snd { grid-area: snd; }
  .s-alpha .ex { grid-area: ex; }
  .s-alpha .ex br { display: none; }
  .s-alpha .ex small::before { content: " – "; }
  .s-card { display: grid; grid-template-columns: auto 1fr; column-gap: 12px; align-items: start; }
  .s-card .s-ico { grid-row: span 2; margin: 2px 0 0; }
  .s-card > :not(.s-ico) { grid-column: 2; }
  a.s-card.s-link { display: grid; }
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  .s-top .s-btn { padding: 8px 12px; font-size: .9rem; }
  .s-actions .s-btn { flex: 1 1 100%; }
  .s-table th, .s-table td { padding: 8px 9px; }
}
@media print {
  .s-top, .s-actions, .s-cta, .s-foot { display: none; }
  body { background: #fff; }
}
/* Math topic pages */
.mt-step { margin: 0 0 18px; }
.mt-step h3 { margin: 0 0 4px; font-size: 1.05rem; }
.mt-step p { margin: 0 0 6px; max-width: 46em; }
.mt-ask { padding: 10px 14px; border-radius: 12px; background: var(--s-soft, rgba(47,111,222,.07)); }
.mt-task { margin: 0 0 14px; }
.mt-task h3 { margin-top: 0; }
.mt-parts { padding-left: 1.2em; }
.mt-parts > li { margin: 0 0 10px; }
.mt-parts details { margin-top: 4px; }
.mt-parts summary { cursor: pointer; color: var(--s-accent, #2f6fde); font-weight: 700; }
.mt-table { border-collapse: collapse; margin: 6px 0; }
.mt-table th, .mt-table td { border: 1px solid rgba(0,0,0,.15); padding: 3px 9px; text-align: center; }
.mt-list { display: flex; flex-wrap: wrap; gap: 8px; }
.s-chip { display: inline-block; margin: 2px 0; padding: 5px 12px; border-radius: 999px; background: var(--s-soft, rgba(47,111,222,.08)); color: inherit; text-decoration: none; font-weight: 600; font-size: .95rem; }
a.s-chip:hover { text-decoration: underline; }
.s-share { max-width: 980px; margin: 8px auto 0; padding: 14px 16px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.s-share-label { color: var(--s-muted); font-size: .92rem; margin-right: 4px; }
.s-chip { font: inherit; font-size: .9rem; font-weight: 600; padding: 7px 14px; border-radius: 999px; border: 1.5px solid var(--s-line); background: transparent; color: var(--s-accent-ink); text-decoration: none; cursor: pointer; }
.s-chip:hover { border-color: var(--s-accent); }
.s-code { width: 100%; font: .85rem/1.45 ui-monospace, SFMono-Regular, Menlo, monospace; padding: 10px 12px; border: 1.5px solid var(--s-line); border-radius: 12px; background: transparent; color: inherit; resize: vertical; }
.s-note { color: var(--s-muted); font-size: .9rem; }
.s-shots { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; margin: 12px 0; }
.s-shots figure { margin: 0; }
.s-shots img { width: 100%; height: auto; border-radius: 14px; border: 1px solid var(--s-line); display: block; }
.s-shots figcaption { color: var(--s-muted); font-size: .85rem; margin-top: 6px; }

/* ---- German home page (de/): hero with sample cards, three areas ---- */
.s-home-hero { position: relative; display: grid; grid-template-columns: 1.15fr .85fr; gap: 32px; align-items: center; padding: 30px 0 10px; }
.s-home-hero::before { content: ''; position: absolute; z-index: -1; top: -40px; right: -10vw; width: 70vw; max-width: 760px; height: 520px; border-radius: 50%; background: radial-gradient(closest-side, color-mix(in srgb, #9a5cf0 22%, transparent), transparent), radial-gradient(closest-side at 30% 60%, color-mix(in srgb, #22b38f 20%, transparent), transparent), radial-gradient(closest-side at 70% 30%, color-mix(in srgb, #4677e6 24%, transparent), transparent); filter: blur(10px); pointer-events: none; }
.s-home-hero h1 { margin: 0 0 16px; font-size: clamp(2.1rem, 5.6vw, 3.4rem); line-height: 1.05; letter-spacing: -.035em; text-wrap: balance; }
.s-home-hero .s-lead { font-size: 1.12rem; line-height: 1.6; max-width: 34em; }
.s-badge { display: inline-block; margin: 0 0 14px; padding: 6px 12px; border-radius: 999px; font-size: .85rem; font-weight: 700; color: var(--s-accent-ink); background: var(--s-accent-soft); }
.s-home-hero .s-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; }
.s-home-hero .s-btn, .s-home-cta .s-btn { border-radius: 999px; padding: 14px 26px; background: var(--s-ink); border-color: var(--s-ink); color: var(--s-bg); }
.s-home-hero .s-btn.light { background: transparent; color: var(--s-ink); border-color: var(--s-line); }
.s-note { margin: 14px 0 0; font-size: .9rem; color: var(--s-muted); }
.s-stack { position: relative; height: 380px; }
.s-sample { position: absolute; width: min(270px, 78%); padding: 16px 18px 18px; border-radius: 22px; background: var(--s-card); box-shadow: 0 18px 40px rgba(20, 24, 40, .14), 0 0 0 1px var(--s-line); display: grid; gap: 6px; }
.s-sample-head { display: flex; align-items: center; gap: 8px; font-size: .8rem; font-weight: 700; color: var(--s-muted); }
.s-sample-head img { border-radius: 7px; }
.s-sample strong { font-size: 1.9rem; line-height: 1.15; }
.s-sample > span:last-child { color: var(--s-muted); font-size: .95rem; }
.s-s1 { top: 0; left: 4%; transform: rotate(-4deg); }
.s-s2 { top: 120px; right: 0; transform: rotate(3deg); }
.s-s3 { top: 236px; left: 12%; transform: rotate(-2deg); }
.s-mini { display: grid; grid-template-columns: repeat(3, 34px); width: max-content; border: 2px solid var(--s-ink); border-radius: 6px; overflow: hidden; }
.s-mini i { display: grid; place-items: center; width: 34px; height: 34px; font-style: normal; font-weight: 800; border-right: 1px solid var(--s-line); border-bottom: 1px solid var(--s-line); }
.s-mini i:nth-child(3n) { border-right: 0; }
.s-mini i:nth-child(n + 7) { border-bottom: 0; }
.s-sub { margin: -4px 0 18px; color: var(--s-muted); }
.s-areas { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.s-area { padding: 22px; border-radius: 24px; background: var(--s-card); box-shadow: 0 0 0 1px var(--s-line); display: flex; flex-direction: column; }
.s-area img { border-radius: 14px; margin-bottom: 14px; }
.s-area h3 { margin: 0 0 6px; font-size: 1.2rem; }
.s-area p { margin: 0 0 14px; color: var(--s-muted); font-size: .97rem; }
.s-area .s-area-links { margin: auto 0 0; display: flex; flex-wrap: wrap; gap: 6px 14px; font-weight: 700; }
.s-area-links a { text-decoration: none; }
.s-area-links a::after { content: ' →'; }
.s-a-lang { background: linear-gradient(180deg, color-mix(in srgb, #4677e6 9%, var(--s-card)), var(--s-card) 55%); }
.s-a-math { background: linear-gradient(180deg, color-mix(in srgb, #22b38f 9%, var(--s-card)), var(--s-card) 55%); }
.s-a-games { background: linear-gradient(180deg, color-mix(in srgb, #9a5cf0 9%, var(--s-card)), var(--s-card) 55%); }
.s-a-lang .s-area-links a { color: #2f5bd8; }
.s-a-math .s-area-links a { color: #0f8a68; }
.s-a-games .s-area-links a { color: #8d3fb0; }
@media (prefers-color-scheme: dark) {
  .s-a-lang .s-area-links a { color: #8fb0ff; }
  .s-a-math .s-area-links a { color: #5fd4b0; }
  .s-a-games .s-area-links a { color: #d39cf0; }
}
.s-points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px 40px; }
.s-points h3 { margin: 0 0 4px; font-size: 1.08rem; }
.s-points p { margin: 0; color: var(--s-muted); }
.s-home-cta { margin: 56px 0 0; padding: 34px 22px; border-radius: 28px; text-align: center; background: linear-gradient(115deg, #4677e6, #22b38f 55%, #9a5cf0); color: #fff; }
.s-home-cta h2 { color: #fff; margin: 0 0 18px; text-wrap: balance; }
.s-home-cta .s-btn { background: #fff; border-color: #fff; color: #1b1d24; }
@media (max-width: 820px) {
  .s-home-hero { grid-template-columns: 1fr; gap: 10px; }
  .s-stack { height: 380px; max-width: 420px; width: 100%; margin: 0 auto 8px; }
  .s-areas { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .s-points { grid-template-columns: 1fr; gap: 16px; }
  .s-home-hero .s-actions .s-btn { flex: 1 1 100%; text-align: center; }
  .s-sample strong { font-size: 1.6rem; }
  .s-s2 { top: 110px; }
  .s-s3 { top: 214px; }
}
main.s-wrap:has(.s-home-hero) { overflow-x: clip; }