/* Public study pages (/cbse, /icse …). LIWA's paper-and-ink look: cream
   ground, ink text, hard zero-blur shadows, orange for action. No JavaScript. */
:root {
  --cream: #FFF8EE; --paper: #FFFFFF; --ink: #12101A; --muted: #5E5870;
  --line: #E9DFD0; --orange: #FF6B35; --orange-deep: #C2410C; --orange-soft: #FFE3D6;
  --grape: #6D28D9; --grape-soft: #EDE4FD; --lime-deep: #15803D; --lime-soft: #DDF5EA;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--cream); color: var(--ink);
  font: 17px/1.6 'Nunito', system-ui, -apple-system, 'Segoe UI', sans-serif;
}
a { color: var(--grape); }
h1, h2 { font-family: 'Baloo 2', 'Nunito', system-ui, sans-serif; line-height: 1.2; text-wrap: balance; }
h1 { font-size: clamp(1.9rem, 5vw, 2.8rem); margin: .3em 0 .2em; }
h2 { font-size: 1.4rem; margin: 0 0 .6em; }

.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; background: var(--paper); border-bottom: 2px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none;
  font-family: 'Baloo 2', sans-serif; font-weight: 800; font-size: 1.4rem; }
.topnav { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.topnav a:not(.btn) { color: var(--ink); text-decoration: none; font-weight: 700; }

.btn {
  display: inline-block; padding: 8px 16px; border-radius: 999px; font-weight: 800;
  color: var(--orange-deep); text-decoration: none; background: var(--paper);
  border: 2px solid var(--orange); box-shadow: 3px 3px 0 var(--orange-deep);
}
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--orange-deep); }
.btn.big { padding: 12px 24px; font-size: 1.05rem; }

.wrap { max-width: 860px; margin: 0 auto; padding: 20px 16px 48px; }
.crumbs { font-size: .9rem; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; }
.crumbs a { color: var(--muted); }
.lead { color: var(--muted); font-size: 1.05rem; margin: 0 0 1.5em; max-width: 65ch; }

section, .cta {
  background: var(--paper); border: 2px solid var(--line); border-radius: 16px;
  box-shadow: 4px 4px 0 var(--line); padding: 20px; margin: 0 0 20px;
}

.grid { list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(min(200px, 100%), 1fr)); }
.card {
  display: flex; flex-direction: column; gap: 2px; padding: 16px; height: 100%;
  background: var(--paper); border: 2px solid var(--line); border-radius: 14px;
  box-shadow: 3px 3px 0 var(--line); color: var(--ink); text-decoration: none;
}
.card strong { font-size: 1.1rem; }
.card span { color: var(--muted); font-size: .92rem; }
.card:hover { border-color: var(--orange); box-shadow: 3px 3px 0 var(--orange-deep); }

.chapters { list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 8px; }
.chapters a {
  display: grid; grid-template-columns: 2.4em 1fr; align-items: center; gap: 4px 10px;
  padding: 12px 14px; background: var(--paper); border: 2px solid var(--line); border-radius: 12px;
  color: var(--ink); text-decoration: none;
}
.chapters a:hover { border-color: var(--orange); }
.num { font-family: 'Baloo 2', sans-serif; font-weight: 800; color: var(--orange-deep); text-align: center; }
.name { font-weight: 700; min-width: 0; overflow-wrap: anywhere; }
.tags { grid-column: 2; display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-style: normal; font-size: .78rem; font-weight: 700; padding: 1px 8px; border-radius: 999px; }
.tag.notes { background: var(--grape-soft); color: var(--grape); }
.tag.qs { background: var(--lime-soft); color: var(--lime-deep); }

.topics, .points { margin: 0; padding-left: 1.2em; }
.topics li, .points li { margin: .25em 0; }
.defs { margin: 0; display: grid; gap: 12px; }
.defs p { margin: 0; }

details { border-top: 1px solid var(--line); padding: 10px 0; }
details:first-of-type { border-top: 0; }
summary { cursor: pointer; font-weight: 700; }
details > div { margin-top: 6px; color: #2C2838; }

.pyq { border-top: 1px solid var(--line); padding: 14px 0; }
.pyq:first-of-type { border-top: 0; padding-top: 0; }
.pyq .src { margin: 0; font-size: .82rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.pyq p { margin: .3em 0; }
.opts { margin: .2em 0 .4em; }
.pyq details { border: 0; padding: 4px 0 0; }

.m { white-space: nowrap; }   /* maths, rendered as plain text */

.cta { background: var(--orange-soft); border-color: #FFC9AF; box-shadow: 4px 4px 0 #F2A27E; }
.cta p { max-width: 60ch; }

.pager { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.pager a { font-weight: 700; }

.foot { text-align: center; padding: 24px 16px 40px; color: var(--muted); font-size: .9rem; }
.foot a { color: var(--muted); }

@media (max-width: 480px) {
  body { font-size: 16px; }
  section, .cta { padding: 16px; }
}
@media (pointer: coarse) {
  .btn, .chapters a, summary { min-height: 44px; }
  summary { display: flex; align-items: center; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }