/* KidStudy site chrome: the header and footer every page shares (inserted by
   tools/site_chrome.py), and the reading column used by the grown-up pages
   (help, contact, privacy, terms, legal, about, blog). Brand tokens: brand.css. */

@font-face { font-family: 'Andika'; src: url('/fonts/andika.woff2') format('woff2'); font-display: swap; }

.ks-header, .ks-footer, .ks-page {
  --ink: #1d2433;
  --muted: #5b6577;
  --line: #e4dfd4;
  --paper: #f6f3ec;
  font-family: system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

/* ---- Header ---- */

.ks-header {
  position: relative;
  z-index: 5;
  background: #fff;
  border-bottom: 1px solid var(--line);
  padding-top: env(safe-area-inset-top);
}
.ks-header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 10px 24px;
}
.ks-header .brand { flex: none; font-size: 27px; }
.ks-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.ks-nav a {
  --tint: var(--ks-blue);
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--ink);
  font: 600 17px/1.2 var(--ks-brand-font);
  text-decoration: none;
  white-space: nowrap;
}
.ks-nav a[data-subject="writing"] { --tint: #a3500c; }
.ks-nav a[data-subject="reading"] { --tint: #157a41; }
.ks-nav a[data-subject="maths"] { --tint: var(--ks-maths); }
.ks-nav a[data-subject="science"] { --tint: #0b7f7f; }
.ks-nav a:hover { background: color-mix(in srgb, var(--tint) 10%, #fff); color: var(--tint); }
.ks-nav a[aria-current="page"] { background: var(--tint); color: #fff; }
.ks-nav .ks-nav-sep { width: 1px; height: 22px; margin: 0 6px; background: var(--line); }

/* ---- Footer ---- */

.ks-footer {
  margin-top: 40px;
  background: #fff;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
}
.ks-footer-inner {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 28px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 24px 20px;
}
.ks-footer .brand { font-size: 24px; }
.ks-footer-about p { margin: 10px 0 0; max-width: 320px; }
.ks-footer-about .ks-promise { color: var(--ink); font-weight: 600; }
.ks-footer-about .ks-kobi { width: 74px; height: auto; float: right; margin: 0 0 6px 10px; }
.ks-footer h2 { margin: 2px 0 10px; color: var(--ink); font: 600 16px/1.2 var(--ks-brand-font); letter-spacing: 0.02em; }
.ks-footer ul { margin: 0; padding: 0; list-style: none; }
.ks-footer li { margin: 0 0 8px; }
.ks-footer a { color: var(--muted); text-decoration: none; }
.ks-footer a:hover { color: var(--ks-blue); text-decoration: underline; }
.ks-footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 20px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 24px max(20px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  font-size: 14px;
}
.ks-footer-base a { color: var(--ks-blue); font-weight: 600; }

/* ---- Grown-up pages: one readable column ---- */

.ks-page { background: var(--paper); color: var(--ink); }
.ks-main {
  max-width: 820px;
  margin: 28px auto 0;
  margin-inline: max(24px, calc((100% - 820px) / 2));
}
.ks-hero { display: flex; align-items: center; gap: 22px; margin-bottom: 18px; }
.ks-hero img { flex: none; width: 120px; height: auto; }
.ks-hero h1 { margin: 0; color: var(--ks-blue); font: 600 42px/1.1 var(--ks-brand-font); }
.ks-hero p { margin: 8px 0 0; color: var(--muted); font-size: 19px; line-height: 1.45; }
.ks-card {
  padding: 28px 32px;
  border-radius: 28px;
  background: #fff;
  box-shadow: 0 1px 2px rgb(29 36 51 / 0.08), 0 8px 24px rgb(29 36 51 / 0.1);
  font-size: 18px;
  line-height: 1.6;
  overflow-wrap: break-word;
}
.ks-card + .ks-card { margin-top: 18px; }
.ks-card h2 { margin: 30px 0 8px; color: var(--ks-blue); font: 600 26px/1.2 var(--ks-brand-font); }
.ks-card h2:first-child { margin-top: 0; }
.ks-card h3 { margin: 22px 0 6px; font: 600 20px/1.25 var(--ks-brand-font); }
.ks-card p, .ks-card ul, .ks-card ol { margin: 0 0 12px; }
.ks-card ul, .ks-card ol { padding-left: 24px; }
.ks-card li { margin-bottom: 6px; }
.ks-card a { color: var(--ks-blue); }
.ks-card .ks-updated { color: var(--muted); font-size: 15px; }
.ks-toc { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 18px; padding: 0; list-style: none; }
.ks-toc a { display: inline-block; padding: 6px 14px; border-radius: 999px; background: #fff; color: var(--ks-blue); font: 600 15px/1.3 var(--ks-brand-font); text-decoration: none; box-shadow: 0 1px 2px rgb(29 36 51 / 0.1); }
.ks-card details { margin: 0 0 10px; padding: 12px 16px; border-radius: 16px; background: #f4f6fb; }
.ks-card details[open] { background: #eef2fa; }
.ks-card summary { cursor: pointer; font: 600 19px/1.35 var(--ks-brand-font); color: var(--ink); }
.ks-card details > :not(summary) { margin-top: 10px; }
.ks-button { display: inline-block; padding: 12px 24px; border-radius: 999px; background: var(--ks-blue); color: #fff !important; font: 600 19px/1.2 var(--ks-brand-font); text-decoration: none; }
.ks-note { padding: 14px 18px; border-radius: 16px; background: #fff7e3; }

/* ---- Phones ---- */

@media (max-width: 760px) {
  .ks-header-inner { flex-wrap: wrap; gap: 6px 12px; padding: 8px 14px 6px; }
  .ks-header .brand { font-size: 24px; }
  /* The menu moves under the logo, wrapping onto a second line if it must. */
  .ks-nav { order: 1; flex: 1 1 100%; flex-wrap: wrap; gap: 2px; margin: 0 -6px; padding: 0 0 4px; }
  .ks-nav a { padding: 6px 11px; font-size: 16px; }
  .ks-nav .ks-nav-sep { display: none; }
  .ks-footer-inner { grid-template-columns: 1fr 1fr; gap: 22px; padding: 26px 16px 16px; }
  .ks-footer-about { grid-column: 1 / -1; }
  .ks-footer-base { padding: 12px 16px max(18px, env(safe-area-inset-bottom)); }
  .ks-main { margin: 16px 14px 0; }
  .ks-hero { gap: 12px; }
  .ks-hero img { width: 82px; }
  .ks-hero h1 { font-size: 30px; }
  .ks-hero p { font-size: 17px; }
  .ks-card { padding: 20px 18px; border-radius: 22px; font-size: 17px; }
  .ks-card h2 { font-size: 23px; }
}

@media print {
  .ks-header, .ks-footer { display: none; }
}