/* Scoped learn / test-series / maths hubs — does not restyle site chrome */
.ln-page {
  --ln-ink: #0f172a;
  --ln-muted: #475569;
  --ln-line: #e2e8f0;
  --ln-bg: #f8fafc;
  --ln-card: #fff;
  --ln-accent: #0f766e;
  --ln-accent-2: #1d4ed8;
  --ln-warn: #9a3412;
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px max(16px, env(safe-area-inset-right)) calc(48px + env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left));
  color: var(--ln-ink);
  overflow-x: clip;
  overflow-wrap: anywhere;
}
.ln-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--ln-muted);
  margin: 8px 0 16px;
}
.ln-crumb a { color: var(--ln-accent); text-decoration: none; }
.ln-crumb a:hover, .ln-crumb a:focus { text-decoration: underline; }
.ln-hero {
  background: linear-gradient(125deg, #0f766e 0%, #134e4a 50%, #1e3a5f 100%);
  color: #fff;
  border-radius: 16px;
  padding: 22px 20px;
  margin-bottom: 22px;
}
.ln-page[data-hub="maths"] .ln-hero { background: linear-gradient(125deg, #1d4ed8 0%, #0f766e 100%); }
.ln-page[data-hub="science"] .ln-hero { background: linear-gradient(125deg, #7c3aed 0%, #1e3a8a 100%); }
.ln-kicker {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  opacity: 0.9;
  margin: 0 0 8px;
}
.ln-hero h1 { margin: 0 0 10px; font-size: clamp(1.4rem, 4vw, 2rem); line-height: 1.25; }
.ln-hero p { margin: 0 0 10px; max-width: 68ch; opacity: 0.95; }
.ln-note {
  background: rgba(255,255,255,0.12);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.92rem;
}
.ln-note a, .ln-hero a { color: #fde68a; }
.ln-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.ln-btn, .ln-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 14px;
  border-radius: 10px;
  background: #fff;
  color: #0f172a;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
}
.ln-actions a.ln-ghost {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.45);
}
.ln-sec { margin: 28px 0; }
.ln-sec h2 { font-size: 1.25rem; margin: 0 0 10px; }
.ln-sec h3 { font-size: 1.05rem; margin: 18px 0 8px; }
.ln-sec p, .ln-sec li { color: var(--ln-muted); line-height: 1.65; }
.ln-sec ul, .ln-sec ol { padding-left: 1.2rem; }
.ln-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(240px, 100%), 1fr));
  gap: 12px;
}
.ln-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--ln-card);
  border: 1px solid var(--ln-line);
  border-radius: 12px;
  padding: 14px;
  text-decoration: none;
  color: inherit;
  min-height: 120px;
  min-width: 0;
}
a.ln-card:hover, a.ln-card:focus {
  border-color: var(--ln-accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
  outline: none;
}
.ln-card strong { color: var(--ln-ink); }
.ln-card span, .ln-meta { font-size: 0.85rem; color: var(--ln-muted); }
.ln-chiprow { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.ln-chip {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #ecfeff;
  color: #115e59;
  text-decoration: none;
  font-size: 0.85rem;
}
.ln-chip:hover, .ln-chip:focus { background: #ccfbf1; }
.ln-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.ln-table { width: 100%; border-collapse: collapse; min-width: 520px; }
.ln-table th, .ln-table td {
  border: 1px solid var(--ln-line);
  padding: 8px 10px;
  text-align: left;
  font-size: 0.92rem;
}
.ln-table th { background: #f1f5f9; }
.ln-faq details {
  border: 1px solid var(--ln-line);
  border-radius: 10px;
  padding: 8px 12px;
  margin: 8px 0;
  background: #fff;
}
.ln-faq summary { cursor: pointer; font-weight: 600; min-height: 36px; }
.ln-faq details p { margin: 8px 0 4px; }
.ln-ex {
  background: #fff;
  border-left: 4px solid var(--ln-accent);
  padding: 10px 14px;
  margin: 12px 0;
}
.ln-warn {
  background: #fff7ed;
  border-left: 4px solid var(--ln-warn);
  padding: 10px 14px;
  margin: 12px 0;
}
.ln-formula {
  font-family: ui-monospace, Consolas, monospace;
  background: #0f172a;
  color: #e2e8f0;
  padding: 10px 12px;
  border-radius: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  font-size: 0.95rem;
  max-width: 100%;
}
.ln-sec code, .ln-hero code {
  overflow-wrap: anywhere;
}
@media (max-width: 768px) {
  .ln-grid { grid-template-columns: 1fr 1fr; }
  .ln-card { min-height: 0; padding: 12px; }
}
@media (max-width: 640px) {
  .ln-page { padding: 12px max(12px, env(safe-area-inset-right)) calc(36px + env(safe-area-inset-bottom, 0px)) max(12px, env(safe-area-inset-left)); }
  .ln-hero { padding: 16px 14px; border-radius: 12px; }
  .ln-actions a { flex: 1 1 calc(50% - 8px); }
  .ln-chip { min-height: 40px; }
  .ln-faq summary { min-height: 44px; }
}
@media (max-width: 480px) {
  .ln-grid { grid-template-columns: 1fr; }
  .ln-actions a { flex-basis: 100%; }
  .ln-hero h1 { font-size: 1.35rem; }
  .ln-card { padding: 12px 10px; }
  .ln-table { min-width: 440px; }
}
@media (max-width: 374px) {
  .ln-actions a { flex-basis: 100%; }
}
.ln-score {
  position: sticky;
  top: var(--gks-sticky-top, 56px);
  z-index: 5;
  background: #0f766e;
  color: #fff;
  font-weight: 800;
  text-align: center;
  padding: 8px 12px;
  border-radius: 10px;
  margin: 0 0 14px;
}
.ln-q {
  background: #fff;
  border: 1px solid var(--ln-line);
  border-radius: 12px;
  padding: 14px;
  margin: 0 0 12px;
}
.ln-q-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 8px;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--ln-accent);
}
.ln-q h3 { margin: 0 0 8px; font-size: 1.02rem; line-height: 1.45; }
.ln-q-hi { margin: 0 0 8px; color: var(--ln-muted); font-size: 0.95rem; }
.ln-opts { list-style: none; margin: 0 0 8px; padding: 0; display: grid; gap: 8px; }
.ln-opt {
  width: 100%;
  text-align: left;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--ln-line);
  background: #f8fafc;
  cursor: pointer;
  font: inherit;
  overflow-wrap: anywhere;
}
.ln-opt:hover, .ln-opt:focus-visible { border-color: var(--ln-accent); background: #ecfdf5; }
.ln-opt.is-ok { background: #dcfce7; border-color: #16a34a; }
.ln-opt.is-bad { background: #fee2e2; border-color: #dc2626; }
.ln-q.is-done .ln-opt { cursor: default; }
.ln-ans { margin-top: 6px; }
.ln-ans summary { cursor: pointer; font-weight: 700; min-height: 36px; }
.ln-key { font-weight: 800; color: #15803d; }
@media (max-width: 640px) {
  .ln-q { padding: 12px 10px; }
  .ln-opt { min-height: 44px; }
}
.ln-page :focus-visible {
  outline: 3px solid #f59e0b;
  outline-offset: 2px;
}