/* =====================================================================
   samplepaper / sp.css — TestMacher public sample-papers design system
   ---------------------------------------------------------------------
   Builds on the existing sp-* family (header, hero, cards, chips,
   question reveals) and adds the upgrade layer:
     · stronger editorial type rhythm (tighter H1, tracked eyebrows)
     · sub-nav under the header (Classes / Subjects / Generator)
     · trust strip + feature grid for the landing hero
     · denser class / subject / chapter cards with chip previews
     · sticky in-page TOC + prev / next chapter nav
     · FAQ accordion (native <details>, no JS)
     · sample-question peek tiles
   No JS dependencies. Inter only. Inline-safe so it can be merged
   back into base.html for cache_page-friendly delivery.
   ===================================================================== */

:root {
  /* Brand */
  --primary:#00685f;
  --primary-container:#008378;
  --primary-deep:#004f48;
  --on-primary:#fff;
  --primary-fixed:#89f5e7;
  --primary-fixed-dim:#6bd8cb;
  --on-primary-fixed-variant:#005049;
  --primary-tint:rgba(0,104,95,.08);
  --primary-tint-2:rgba(0,104,95,.14);

  /* Surfaces */
  --bg:#f7f9fb;
  --bg-warm:#fbfaf6;          /* warmer alt bg for editorial section */
  --surface:#fff;
  --surface-low:#f2f4f6;
  --surface-container:#eceef0;
  --surface-variant:#e0e3e5;

  /* Ink */
  --on-surface:#191c1e;
  --on-surface-variant:#3d4947;
  --on-surface-faint:#6d7a77;
  --outline:#6d7a77;
  --outline-variant:#bcc9c6;
  --outline-soft:#dee3e2;

  /* Accents */
  --inverse-surface:#1f2a28;
  --inverse-on-surface:#eff1f3;
  --secondary-container:#d5e0f8;
  --on-secondary-container:#586377;
  --tertiary-fixed:#d3e4fe;
  --on-tertiary-fixed:#0b1c30;
  --amber:#a86b00;
  --amber-tint:#fff4dc;
  --plum:#7c3aed;
  --plum-tint:#f3edff;
  --error:#ba1a1a;

  /* Radii */
  --r-sm:6px; --r:12px; --r-lg:16px; --r-xl:24px; --r-full:9999px;

  /* Shadow */
  --shadow-xs:0 1px 2px rgba(15,28,30,.05);
  --shadow:0 4px 6px -1px rgba(15,28,30,.05),0 2px 4px -1px rgba(15,28,30,.03);
  --shadow-md:0 10px 24px -8px rgba(15,28,30,.10),0 2px 6px -2px rgba(15,28,30,.04);
  --shadow-teal:0 8px 24px -12px rgba(0,104,95,.30);

  /* Layout */
  --maxw:1080px;
  --maxw-reading:760px;

  /* Type ramp — Inter only, hierarchy via weight + tracking */
  --t-display:clamp(2rem, 1.4rem + 2.8vw, 3.25rem);
  --t-h1:clamp(1.65rem, 1.25rem + 1.6vw, 2.25rem);
  --t-h2:clamp(1.2rem, 1rem + .8vw, 1.45rem);
  --t-h3:1.05rem;
}

* { box-sizing:border-box; margin:0; padding:0; }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; scroll-padding-top:120px; }
body {
  font-family:'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  color:var(--on-surface); background:var(--bg); line-height:1.6;
  -webkit-font-smoothing:antialiased;
  font-feature-settings:'cv11','ss01','ss03';
}
a { color:var(--primary); text-decoration:none; }
a:hover { text-decoration:underline; }
svg { display:block; }
img { max-width:100%; height:auto; }

/* ── A11y ──────────────────────────────────────────────────────── */
.sp-skip {
  position:absolute; top:-100px; left:8px; z-index:1000;
  background:var(--primary); color:#fff; padding:8px 14px; border-radius:8px;
  font-weight:600; font-size:.85rem;
}
.sp-skip:focus { top:8px; text-decoration:none; }

/* ── Header ────────────────────────────────────────────────────── */
.sp-header {
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.92); backdrop-filter:saturate(140%) blur(8px);
  -webkit-backdrop-filter:saturate(140%) blur(8px);
  box-shadow:0 1px 0 var(--outline-soft);
}
.sp-header__in {
  max-width:var(--maxw); margin:0 auto; height:60px; padding:0 16px;
  display:flex; align-items:center; justify-content:space-between; gap:12px;
}
.sp-brand { display:flex; align-items:center; gap:10px; }
.sp-brand:hover { text-decoration:none; }
.sp-brand img { height:28px; width:auto; display:block; }
.sp-brand__mark {
  /* SVG-less text fallback for previews */
  display:inline-flex; align-items:center; gap:8px;
  font-weight:800; font-size:1.05rem; letter-spacing:-.01em;
  color:var(--on-surface);
}
.sp-brand__dot {
  width:24px; height:24px; border-radius:7px; background:var(--primary);
  display:grid; place-items:center; color:#fff; font-weight:800;
  font-size:.78rem; letter-spacing:0;
}

.sp-header__right { display:flex; align-items:center; gap:10px; }
.sp-genbtn {
  display:inline-flex; align-items:center; gap:6px; background:var(--primary);
  color:var(--on-primary); font-weight:600; font-size:.85rem; padding:9px 16px;
  border-radius:var(--r); transition:background .15s, transform .12s;
  box-shadow:0 1px 0 rgba(0,0,0,.04), inset 0 1px 0 rgba(255,255,255,.12);
}
.sp-genbtn:hover { background:var(--primary-container); text-decoration:none; transform:translateY(-1px); }
.sp-genbtn svg { width:16px; height:16px; }

/* Sub-nav (Classes / Subjects / Sample papers) */
.sp-subnav {
  background:var(--surface);
  border-bottom:1px solid var(--outline-soft);
}
.sp-subnav__in {
  max-width:var(--maxw); margin:0 auto; padding:0 16px;
  display:flex; align-items:center; gap:4px; overflow-x:auto;
  scrollbar-width:none;
}
.sp-subnav__in::-webkit-scrollbar { display:none; }
.sp-subnav__in a {
  display:inline-flex; align-items:center; gap:6px;
  padding:11px 12px; font-size:.84rem; font-weight:600;
  color:var(--on-surface-faint); white-space:nowrap;
  border-bottom:2px solid transparent; margin-bottom:-1px;
  transition:color .15s, border-color .15s;
}
.sp-subnav__in a:hover { color:var(--on-surface); text-decoration:none; }
.sp-subnav__in a.is-current {
  color:var(--primary); border-color:var(--primary);
}
.sp-subnav__in a svg { width:14px; height:14px; }

/* ── Layout ────────────────────────────────────────────────────── */
.sp-wrap {
  max-width:var(--maxw); margin:0 auto; padding:24px 16px 8px;
}
.sp-content { max-width:var(--maxw-reading); }
@media (min-width:768px) {
  .sp-wrap { padding:36px 32px 12px; }
}

/* ── Breadcrumbs ───────────────────────────────────────────────── */
.sp-crumbs {
  display:flex; align-items:center; flex-wrap:wrap; gap:6px;
  font-size:.78rem; font-weight:500; color:var(--on-surface-faint);
  margin-bottom:18px;
}
.sp-crumbs a { color:var(--on-surface-faint); }
.sp-crumbs a:hover { color:var(--primary); }
.sp-crumbs svg { width:12px; height:12px; color:var(--outline-variant); }
.sp-crumbs .is-current { color:var(--primary); font-weight:700; }

/* ── Headings & editorial atoms ────────────────────────────────── */
.sp-eyebrow {
  display:inline-flex; align-items:center; gap:6px;
  font-size:.72rem; font-weight:700; letter-spacing:.08em;
  text-transform:uppercase; color:var(--primary);
  padding:4px 10px; background:var(--primary-tint); border-radius:var(--r-full);
}
.sp-eyebrow--plain {
  background:transparent; padding:0;
}
.sp-eyebrow svg { width:13px; height:13px; }

h1.sp-display {
  font-size:var(--t-display); font-weight:800; line-height:1.04;
  letter-spacing:-.028em; margin-bottom:14px;
  color:var(--on-surface); text-wrap:balance;
}
h1.sp-h1 {
  font-size:var(--t-h1); font-weight:800; line-height:1.15;
  letter-spacing:-.022em; margin-bottom:8px; text-wrap:balance;
}
h2.sp-h2 {
  font-size:var(--t-h2); font-weight:700; line-height:1.25;
  letter-spacing:-.012em; margin:0 0 14px;
}
h3.sp-h3 {
  font-size:var(--t-h3); font-weight:700; line-height:1.3;
  letter-spacing:-.005em;
}
.sp-lead {
  color:var(--on-surface-variant); font-size:1.025rem; max-width:60ch;
  text-wrap:pretty;
}
.sp-num { font-variant-numeric:tabular-nums; }

/* Section block with breathing room */
.sp-section { margin:42px 0; }
.sp-section--tight { margin:28px 0; }
.sp-section__head {
  display:flex; align-items:flex-end; justify-content:space-between;
  gap:16px; margin-bottom:18px; flex-wrap:wrap;
}
.sp-section__head .sp-eyebrow { margin-bottom:8px; }
.sp-section__title { display:flex; flex-direction:column; gap:6px; }
.sp-section__title p {
  font-size:.92rem; color:var(--on-surface-variant); max-width:52ch;
}
.sp-section__cta { font-size:.88rem; font-weight:600; }
.sp-section__cta svg { width:14px; height:14px; display:inline-block; vertical-align:-2px; margin-left:2px; }

.sp-divider {
  border:0; height:1px; background:var(--outline-soft);
  margin:36px 0;
}

/* ── Hero ──────────────────────────────────────────────────────── */
.sp-hero {
  position:relative; overflow:hidden;
  background:
    radial-gradient(900px 400px at 90% -10%, rgba(137,245,231,.45), transparent 60%),
    radial-gradient(700px 320px at -5% 110%, rgba(0,104,95,.06), transparent 60%),
    linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);
  border:1px solid var(--outline-soft); border-radius:var(--r-xl);
  padding:34px 22px 30px; margin-bottom:8px;
}
@media (min-width:768px) {
  .sp-hero { padding:54px 48px 44px; }
}
.sp-hero__in {
  display:grid; grid-template-columns:1fr; gap:24px;
}
@media (min-width:920px) {
  .sp-hero__in { grid-template-columns:1.25fr 1fr; align-items:center; gap:48px; }
}
.sp-hero__copy { display:flex; flex-direction:column; align-items:flex-start; gap:14px; }
.sp-hero p.sp-lead { font-size:1.05rem; }
.sp-hero__btns { display:flex; flex-wrap:wrap; gap:10px; margin-top:6px; }

.sp-hero__trust {
  display:flex; flex-wrap:wrap; align-items:center; gap:6px 16px;
  margin-top:16px; padding-top:16px;
  border-top:1px dashed var(--outline-soft);
  font-size:.82rem; color:var(--on-surface-faint);
}
.sp-hero__trust strong { color:var(--on-surface); font-weight:700; }
.sp-hero__trust .sp-num { font-weight:700; color:var(--on-surface); }
.sp-hero__trust svg { width:14px; height:14px; color:var(--primary); display:inline-block; vertical-align:-2px; margin-right:4px; }

/* Hero preview tile (right column) — a sample question peek */
.sp-hero__peek {
  position:relative;
  background:var(--surface); border:1px solid var(--outline-soft);
  border-radius:var(--r-lg); padding:18px;
  box-shadow:var(--shadow-md);
}
.sp-hero__peek::before {
  content:''; position:absolute; inset:auto -8px -8px auto;
  width:120px; height:120px; border-radius:var(--r-lg);
  background:linear-gradient(135deg, var(--primary-fixed-dim), transparent 70%);
  filter:blur(20px); opacity:.6; z-index:-1;
}
.sp-hero__peek__hd {
  display:flex; align-items:center; gap:8px; margin-bottom:10px;
  font-size:.7rem; font-weight:700; letter-spacing:.08em; text-transform:uppercase;
  color:var(--primary);
}
.sp-hero__peek__hd::before {
  content:''; width:6px; height:6px; border-radius:50%; background:var(--primary);
  box-shadow:0 0 0 4px var(--primary-tint);
}

/* ── Buttons ───────────────────────────────────────────────────── */
.sp-btn {
  display:inline-flex; align-items:center; gap:8px; font-weight:600; font-size:.95rem;
  padding:11px 20px; border-radius:var(--r); border:1px solid transparent;
  cursor:pointer; transition:all .15s; line-height:1.2;
}
.sp-btn--primary {
  background:var(--primary); color:var(--on-primary);
  box-shadow:0 1px 0 rgba(0,0,0,.04), inset 0 1px 0 rgba(255,255,255,.14);
}
.sp-btn--primary:hover { background:var(--primary-container); text-decoration:none; transform:translateY(-1px); }
.sp-btn--outline { background:transparent; border-color:var(--outline-variant); color:var(--on-surface); }
.sp-btn--outline:hover { border-color:var(--primary); color:var(--primary); text-decoration:none; }
.sp-btn--ghost { background:transparent; color:var(--on-surface); padding-left:8px; padding-right:8px; }
.sp-btn--ghost:hover { color:var(--primary); text-decoration:none; }
.sp-btn--sm { padding:7px 12px; font-size:.85rem; }
.sp-btn--full { width:100%; justify-content:center; }
.sp-btn svg { width:16px; height:16px; }

/* ── Trust strip ───────────────────────────────────────────────── */
.sp-trust {
  display:grid; grid-template-columns:repeat(2, 1fr); gap:1px;
  background:var(--outline-soft); border:1px solid var(--outline-soft);
  border-radius:var(--r-lg); overflow:hidden; margin:22px 0;
}
@media (min-width:640px) { .sp-trust { grid-template-columns:repeat(4, 1fr); } }
.sp-trust__cell {
  background:var(--surface); padding:18px 18px 16px;
  display:flex; flex-direction:column; gap:4px;
}
.sp-trust__num {
  font-size:1.6rem; font-weight:800; letter-spacing:-.02em;
  color:var(--on-surface); font-variant-numeric:tabular-nums;
  display:flex; align-items:baseline; gap:6px; line-height:1;
}
.sp-trust__num em { font-style:normal; color:var(--primary); font-size:1rem; font-weight:700; }
.sp-trust__k {
  font-size:.72rem; font-weight:700; letter-spacing:.05em; text-transform:uppercase;
  color:var(--on-surface-faint);
}
.sp-trust__sub { font-size:.78rem; color:var(--on-surface-variant); }

/* ── Feature grid (what you get) ───────────────────────────────── */
.sp-features {
  display:grid; grid-template-columns:repeat(auto-fit, minmax(220px, 1fr));
  gap:14px;
}
.sp-feature {
  background:var(--surface); border:1px solid var(--outline-soft);
  border-radius:var(--r); padding:18px;
  display:flex; flex-direction:column; gap:8px;
}
.sp-feature__ico {
  width:36px; height:36px; border-radius:10px;
  background:var(--primary-tint); color:var(--primary);
  display:grid; place-items:center;
}
.sp-feature__ico svg { width:18px; height:18px; }
.sp-feature h3 {
  font-size:.98rem; font-weight:700; color:var(--on-surface); letter-spacing:-.005em;
}
.sp-feature p { font-size:.86rem; color:var(--on-surface-variant); line-height:1.5; }

/* ── Card grid ─────────────────────────────────────────────────── */
.sp-grid {
  display:grid; grid-template-columns:repeat(auto-fill, minmax(240px, 1fr));
  gap:14px; margin-top:8px;
}
.sp-grid--wide  { grid-template-columns:repeat(auto-fill, minmax(300px, 1fr)); }
.sp-grid--two   { grid-template-columns:repeat(auto-fill, minmax(420px, 1fr)); }

.sp-card {
  position:relative; display:block; background:var(--surface);
  border:1px solid var(--outline-soft); border-radius:var(--r); padding:18px;
  box-shadow:var(--shadow-xs);
  transition:transform .15s, border-color .15s, box-shadow .15s;
}
.sp-card:hover {
  text-decoration:none; border-color:var(--primary);
  transform:translateY(-2px); box-shadow:var(--shadow-teal);
}
.sp-card__top {
  display:flex; justify-content:space-between; align-items:flex-start;
  gap:10px; margin-bottom:8px;
}
.sp-card__title {
  font-size:1.05rem; font-weight:700; color:var(--on-surface); line-height:1.3;
  letter-spacing:-.01em;
}
.sp-card__sub {
  font-size:.82rem; color:var(--on-surface-variant); margin-top:2px;
}
.sp-card__arrow {
  color:var(--outline-variant); flex-shrink:0; transition:color .15s, transform .15s;
}
.sp-card:hover .sp-card__arrow { color:var(--primary); transform:translateX(2px); }
.sp-card__arrow svg { width:18px; height:18px; }
.sp-card__meta {
  display:flex; flex-wrap:wrap; gap:8px; margin-top:12px; font-size:.82rem;
  color:var(--on-surface-variant);
}
.sp-card__meta span { display:inline-flex; align-items:center; gap:5px; }

/* Tinted icon badge */
.sp-badge-ico {
  width:40px; height:40px; border-radius:10px; display:flex; align-items:center;
  justify-content:center; margin-bottom:12px;
  background:var(--primary-tint); color:var(--primary);
  font-weight:700; font-size:1rem;
}
.sp-badge-ico--lg {
  width:48px; height:48px; border-radius:12px;
}
.sp-badge-ico svg { width:20px; height:20px; }

/* Class card — denser, with subject chips */
.sp-class-card {
  position:relative; display:flex; flex-direction:column; gap:12px;
  background:var(--surface); border:1px solid var(--outline-soft);
  border-radius:var(--r); padding:18px;
  box-shadow:var(--shadow-xs);
  transition:transform .15s, border-color .15s, box-shadow .15s;
  color:inherit;
}
.sp-class-card:hover {
  text-decoration:none; border-color:var(--primary);
  transform:translateY(-2px); box-shadow:var(--shadow-teal);
}
.sp-class-card__hd { display:flex; align-items:center; gap:12px; }
.sp-class-card__no {
  flex-shrink:0; width:48px; height:48px; border-radius:10px;
  background:var(--primary); color:#fff;
  display:grid; place-items:center;
  font-weight:800; font-size:1.15rem; letter-spacing:-.02em;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.16), 0 2px 6px -2px rgba(0,104,95,.5);
}
.sp-class-card__no--alt { background:var(--primary-deep); }
.sp-class-card__title {
  font-size:1.05rem; font-weight:700; color:var(--on-surface); letter-spacing:-.01em;
}
.sp-class-card__sub {
  font-size:.78rem; color:var(--on-surface-faint); margin-top:1px;
}
.sp-class-card__chips {
  display:flex; flex-wrap:wrap; gap:6px;
}
.sp-class-card__foot {
  display:flex; align-items:center; justify-content:space-between;
  margin-top:auto; padding-top:8px;
  font-size:.82rem; color:var(--on-surface-variant);
}
.sp-class-card__foot strong { color:var(--on-surface); font-weight:700; }
.sp-class-card__arrow { color:var(--outline-variant); transition:color .15s, transform .15s; }
.sp-class-card:hover .sp-class-card__arrow { color:var(--primary); transform:translateX(2px); }
.sp-class-card__arrow svg { width:18px; height:18px; }

/* Subject card with chapter chips (class hub) */
.sp-subjcard {
  position:relative; background:var(--surface); border:1px solid var(--outline-soft);
  border-radius:var(--r); padding:18px;
  box-shadow:var(--shadow-xs);
  transition:transform .15s, border-color .15s, box-shadow .15s;
  display:flex; flex-direction:column; gap:12px;
}
.sp-subjcard--link { color:inherit; }
.sp-subjcard--link:hover {
  text-decoration:none; border-color:var(--primary);
  transform:translateY(-2px); box-shadow:var(--shadow-teal);
}
.sp-subjcard__head { display:flex; align-items:center; gap:10px; }
.sp-subjcard__head .sp-badge-ico { margin-bottom:0; flex-shrink:0; }
.sp-subjcard__head .sp-card__title { font-size:1.05rem; }
.sp-subjcard__chapters {
  display:flex; flex-direction:column; gap:6px;
  font-size:.86rem; line-height:1.45;
}
.sp-subjcard__chapter {
  display:flex; align-items:center; gap:8px;
  color:var(--on-surface-variant);
}
.sp-subjcard__chapter::before {
  content:''; width:4px; height:4px; border-radius:50%; background:var(--outline-variant);
  flex-shrink:0;
}
.sp-subjcard__more {
  font-size:.78rem; font-weight:600; color:var(--primary);
}

/* Chapter card with topic chips and sample question peek (subject hub) */
.sp-chapcard {
  position:relative; display:flex; flex-direction:column; gap:10px;
  background:var(--surface); border:1px solid var(--outline-soft);
  border-radius:var(--r); padding:18px;
  box-shadow:var(--shadow-xs); color:inherit;
  transition:transform .15s, border-color .15s, box-shadow .15s;
}
.sp-chapcard:hover {
  text-decoration:none; border-color:var(--primary);
  transform:translateY(-2px); box-shadow:var(--shadow-teal);
}
.sp-chapcard__hd { display:flex; justify-content:space-between; align-items:flex-start; gap:10px; }
.sp-chapcard__num {
  flex-shrink:0; min-width:34px; height:34px; padding:0 8px; border-radius:8px;
  background:var(--primary-tint); color:var(--primary);
  font-size:.78rem; font-weight:700; letter-spacing:-.01em;
  display:grid; place-items:center; font-variant-numeric:tabular-nums;
}
.sp-chapcard__num--feat { background:var(--primary); color:#fff; }
.sp-chapcard__title { font-size:1.05rem; font-weight:700; color:var(--on-surface); letter-spacing:-.01em; line-height:1.3; }
.sp-chapcard__topics { font-size:.84rem; color:var(--on-surface-variant); line-height:1.5; }
.sp-chapcard__foot {
  display:flex; align-items:center; justify-content:space-between; gap:8px;
  padding-top:10px; margin-top:auto; border-top:1px dashed var(--outline-soft);
  font-size:.82rem;
}
.sp-chapcard__foot__l {
  display:flex; flex-wrap:wrap; gap:6px; color:var(--on-surface-variant);
}

/* ── Chips / tags ──────────────────────────────────────────────── */
.sp-chip {
  display:inline-flex; align-items:center; gap:5px; font-size:.72rem; font-weight:600;
  padding:3px 10px; border-radius:var(--r-full);
  background:var(--primary-tint); color:var(--primary);
}
.sp-chip--soft    { background:var(--surface-container); color:var(--on-surface-variant); }
.sp-chip--outline { background:transparent; border:1px solid var(--outline-soft); color:var(--on-surface-variant); }
.sp-chip--info    { background:var(--secondary-container); color:var(--on-secondary-container); }
.sp-chip--amber   { background:var(--amber-tint); color:var(--amber); }
.sp-chip--plum    { background:var(--plum-tint); color:var(--plum); }
.sp-chip svg { width:11px; height:11px; }
a.sp-chip { transition:all .15s; }
a.sp-chip:hover { text-decoration:none; }
a.sp-chip--link:hover { background:var(--primary); color:#fff; }
.sp-tags { display:flex; flex-wrap:wrap; gap:6px; margin-top:6px; }

/* ── Stat bar ──────────────────────────────────────────────────── */
.sp-statbar {
  display:flex; align-items:center; gap:0;
  background:var(--surface); border:1px solid var(--outline-soft);
  border-radius:var(--r); overflow:hidden;
  margin-bottom:24px;
}
.sp-statbar__item {
  display:flex; flex-direction:column; flex:1;
  padding:14px 18px;
}
.sp-statbar__k {
  font-size:.7rem; font-weight:700; letter-spacing:.05em; text-transform:uppercase;
  color:var(--on-surface-faint);
}
.sp-statbar__v {
  font-size:1.25rem; font-weight:800; color:var(--on-surface);
  letter-spacing:-.02em; font-variant-numeric:tabular-nums; line-height:1.2;
  display:flex; align-items:baseline; gap:4px;
}
.sp-statbar__v em { font-style:normal; color:var(--primary); font-size:.85rem; font-weight:700; }
.sp-statbar__div { width:1px; align-self:stretch; background:var(--outline-soft); }

/* ── Feature spotlight (dark card) ─────────────────────────────── */
.sp-spotlight {
  position:relative; overflow:hidden; color:var(--inverse-on-surface);
  background:
    radial-gradient(800px 200px at 100% 0%, rgba(137,245,231,.16), transparent 60%),
    var(--inverse-surface);
  border-radius:var(--r-lg); padding:32px 28px; margin:8px 0 24px;
  display:grid; gap:18px; grid-template-columns:1fr;
}
@media (min-width:760px) {
  .sp-spotlight { grid-template-columns:1.4fr 1fr; align-items:center; padding:36px 36px; }
}
.sp-spotlight__eyebrow {
  font-size:.72rem; font-weight:700; letter-spacing:.08em; text-transform:uppercase;
  color:var(--primary-fixed-dim); margin-bottom:8px; display:inline-block;
}
.sp-spotlight h2 { font-size:1.45rem; font-weight:800; margin:0 0 10px; color:#fff; letter-spacing:-.02em; line-height:1.2; }
.sp-spotlight p { font-size:.94rem; opacity:.86; max-width:46ch; margin-bottom:16px; }
.sp-spotlight .sp-btn--primary { background:#fff; color:var(--primary); }
.sp-spotlight .sp-btn--primary:hover { background:var(--primary-fixed); color:var(--primary-deep); }
.sp-spotlight__panel {
  background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.08);
  border-radius:var(--r); padding:18px;
  display:flex; flex-direction:column; gap:10px;
}
.sp-spotlight__row {
  display:grid; grid-template-columns:auto 1fr; gap:10px; align-items:center;
  font-size:.86rem;
}
.sp-spotlight__row__k {
  display:grid; place-items:center; width:28px; height:28px; border-radius:8px;
  background:var(--primary-container); color:#fff; font-weight:700; font-size:.78rem;
}

/* ── Question sections (chapter page) ──────────────────────────── */
.sp-section-label {
  display:flex; align-items:center; gap:10px; padding:14px 0 0;
  margin:32px 0 8px; scroll-margin-top:120px;
}
.sp-section-label__pill {
  font-size:.74rem; font-weight:700; letter-spacing:.04em;
  background:var(--tertiary-fixed); color:var(--on-tertiary-fixed);
  padding:5px 12px; border-radius:8px;
}
.sp-section-label__count {
  font-size:.78rem; color:var(--on-surface-faint); font-weight:600;
  font-variant-numeric:tabular-nums;
}
.sp-section-label__rule {
  flex:1; height:1px; background:var(--outline-soft);
}

.sp-qlist { display:flex; flex-direction:column; gap:14px; margin-top:14px; }
.sp-q {
  background:var(--surface); border:1px solid var(--outline-soft); border-radius:var(--r);
  padding:18px 20px; box-shadow:var(--shadow-xs);
  scroll-margin-top:120px;
}
.sp-q__head {
  display:flex; justify-content:space-between; align-items:flex-start; gap:10px;
  margin-bottom:10px;
}
.sp-q__no {
  font-size:.74rem; font-weight:700; color:var(--on-surface-faint);
  font-variant-numeric:tabular-nums; letter-spacing:.02em;
  background:var(--surface-low); padding:3px 8px; border-radius:6px;
}
.sp-q__marks { font-size:.74rem; font-weight:700; color:var(--primary); white-space:nowrap; }
.sp-q__text { font-size:1rem; color:var(--on-surface); margin-bottom:12px; line-height:1.55; }
.sp-q__text strong { font-weight:700; }

/* MCQ / statement options */
.sp-opts { display:flex; flex-direction:column; gap:8px; }
.sp-opt {
  display:flex; align-items:flex-start; gap:10px; padding:9px 12px; border-radius:10px;
  border:1px solid var(--outline-soft); font-size:.93rem; color:var(--on-surface);
  background:var(--surface);
}
.sp-opt__l {
  display:grid; place-items:center; width:22px; height:22px; border-radius:50%;
  border:1px solid var(--outline-soft); font-size:.72rem; font-weight:700; flex-shrink:0;
  color:var(--on-surface-faint); margin-top:1px;
}
.sp-opt.is-correct {
  border-color:var(--primary); background:var(--primary-tint);
}
.sp-opt.is-correct .sp-opt__l {
  background:var(--primary); border-color:var(--primary); color:#fff;
}

.sp-ar { display:flex; flex-direction:column; gap:8px; margin-bottom:12px; }

/* Story / table / picture */
.sp-passage {
  background:var(--surface-low); border-left:4px solid var(--primary);
  border-radius:0 8px 8px 0; padding:14px 16px; margin-bottom:12px;
  font-size:.95rem; line-height:1.65; color:var(--on-surface); white-space:pre-wrap;
}
.sp-table-wrap {
  overflow-x:auto; border:1px solid var(--outline-soft); border-radius:8px; margin-bottom:12px;
}
.sp-table { border-collapse:collapse; width:100%; font-size:.9rem; }
.sp-table th, .sp-table td {
  border:1px solid var(--outline-soft); padding:8px 10px; text-align:left; vertical-align:top;
}
.sp-table th { background:var(--surface-low); font-weight:600; color:var(--on-surface); }
.sp-pic {
  max-width:100%; height:auto; border:1px solid var(--outline-soft);
  border-radius:8px; margin-bottom:12px;
}
.sp-subqs { margin:8px 0 0; padding-left:20px; display:flex; flex-direction:column; gap:12px; }
.sp-subqs > li { font-size:.94rem; color:var(--on-surface); }
.sp-subq__q { font-weight:500; }

/* ── Answer reveal (native <details>, no JS) ───────────────────── */
.sp-reveal {
  margin-top:14px; padding-top:14px; border-top:1px solid var(--outline-soft);
}
.sp-reveal > summary {
  display:inline-flex; align-items:center; gap:6px; cursor:pointer;
  color:var(--primary); font-weight:600; font-size:.88rem; list-style:none;
  width:fit-content; padding:4px 10px; margin-left:-10px; border-radius:var(--r-full);
  transition:background .15s;
}
.sp-reveal > summary:hover { background:var(--primary-tint); text-decoration:none; }
.sp-reveal > summary::-webkit-details-marker { display:none; }
.sp-reveal > summary svg { width:16px; height:16px; }
.sp-reveal[open] > summary .sp-reveal__show { display:none; }
.sp-reveal:not([open]) > summary .sp-reveal__hide { display:none; }
.sp-answer {
  margin-top:12px; background:var(--primary-tint); border-left:4px solid var(--primary);
  border-radius:8px; padding:14px 16px;
}
.sp-answer__key { font-size:.92rem; font-weight:700; color:var(--primary-deep); margin-bottom:6px; }
.sp-answer__body { font-size:.92rem; color:var(--on-surface-variant); white-space:pre-wrap; line-height:1.6; }

/* ── In-page TOC (chapter page) ────────────────────────────────── */
.sp-toc {
  position:relative;
  background:var(--surface); border:1px solid var(--outline-soft);
  border-radius:var(--r); padding:14px 16px;
  display:flex; flex-direction:column; gap:8px;
}
.sp-toc__hd {
  display:flex; align-items:center; gap:8px; font-size:.72rem;
  font-weight:700; letter-spacing:.05em; text-transform:uppercase;
  color:var(--on-surface-faint); margin-bottom:2px;
}
.sp-toc__hd svg { width:13px; height:13px; }
.sp-toc__list { display:flex; flex-direction:column; gap:0; }
.sp-toc__list a {
  display:flex; align-items:center; justify-content:space-between; gap:8px;
  padding:8px 0; font-size:.92rem; color:var(--on-surface);
  border-bottom:1px dashed var(--outline-soft);
}
.sp-toc__list a:last-child { border-bottom:0; }
.sp-toc__list a:hover { color:var(--primary); text-decoration:none; }
.sp-toc__list a span:first-child { display:inline-flex; align-items:center; gap:8px; flex:1; }
.sp-toc__list a .sp-toc__no {
  font-variant-numeric:tabular-nums; color:var(--on-surface-faint);
  font-size:.78rem; font-weight:700; min-width:18px;
}
.sp-toc__list a .sp-toc__count {
  font-size:.78rem; color:var(--on-surface-faint); font-variant-numeric:tabular-nums;
}

@media (min-width:1100px) {
  .sp-chapter-layout {
    display:grid; grid-template-columns:1fr 240px; gap:36px; align-items:start;
  }
  .sp-toc--sticky {
    position:sticky; top:128px;
  }
}

/* ── Prev / Next chapter ───────────────────────────────────────── */
.sp-pn { display:grid; grid-template-columns:1fr 1fr; gap:10px; margin:32px 0 16px; }
@media (max-width:540px) { .sp-pn { grid-template-columns:1fr; } }
.sp-pn__btn {
  display:flex; flex-direction:column; gap:2px;
  background:var(--surface); border:1px solid var(--outline-soft);
  border-radius:var(--r); padding:12px 14px;
  color:var(--on-surface); transition:border-color .15s, transform .15s, box-shadow .15s;
}
.sp-pn__btn:hover {
  text-decoration:none; border-color:var(--primary); transform:translateY(-1px);
  box-shadow:var(--shadow-teal);
}
.sp-pn__k {
  display:flex; align-items:center; gap:6px;
  font-size:.7rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase;
  color:var(--on-surface-faint);
}
.sp-pn__k svg { width:13px; height:13px; }
.sp-pn__title { font-size:.95rem; font-weight:700; color:var(--on-surface); line-height:1.3; letter-spacing:-.01em; }
.sp-pn__btn--next { text-align:right; align-items:flex-end; }

/* ── Related list ──────────────────────────────────────────────── */
.sp-related {
  background:var(--surface-low); border:1px solid var(--outline-soft);
  border-radius:var(--r); padding:18px 20px; margin:24px 0;
}
.sp-related h3 { font-size:.92rem; font-weight:700; color:var(--on-surface); margin-bottom:10px; }
.sp-related ul { list-style:none; display:flex; flex-wrap:wrap; gap:8px; }
.sp-related a {
  display:inline-flex; align-items:center; gap:6px;
  padding:6px 12px; border-radius:var(--r-full);
  background:var(--surface); border:1px solid var(--outline-soft);
  font-size:.84rem; font-weight:500; color:var(--on-surface);
}
.sp-related a:hover { border-color:var(--primary); color:var(--primary); text-decoration:none; }

/* ── FAQ (native <details>, no JS) ─────────────────────────────── */
.sp-faq {
  margin:36px 0 24px;
}
.sp-faq__list {
  background:var(--surface); border:1px solid var(--outline-soft);
  border-radius:var(--r); overflow:hidden;
}
.sp-faq__item { border-bottom:1px solid var(--outline-soft); }
.sp-faq__item:last-child { border-bottom:0; }
.sp-faq__item > summary {
  list-style:none; cursor:pointer;
  padding:16px 18px; padding-right:48px;
  font-size:.98rem; font-weight:600; color:var(--on-surface);
  line-height:1.4; position:relative;
  transition:background .15s;
}
.sp-faq__item > summary::-webkit-details-marker { display:none; }
.sp-faq__item > summary:hover { background:var(--surface-low); }
.sp-faq__item > summary::after {
  content:''; position:absolute; right:20px; top:50%;
  width:10px; height:10px; border-right:2px solid var(--on-surface-faint);
  border-bottom:2px solid var(--on-surface-faint);
  transform:translateY(-65%) rotate(45deg);
  transition:transform .2s;
}
.sp-faq__item[open] > summary::after { transform:translateY(-25%) rotate(-135deg); }
.sp-faq__body {
  padding:0 18px 18px; font-size:.92rem; color:var(--on-surface-variant);
  line-height:1.65;
}
.sp-faq__body p + p { margin-top:8px; }

/* ── CTA ───────────────────────────────────────────────────────── */
.sp-cta {
  position:relative; overflow:hidden; color:#fff;
  background:
    radial-gradient(800px 220px at 0% 100%, rgba(137,245,231,.18), transparent 60%),
    linear-gradient(135deg, #003832, var(--primary-container));
  border-radius:var(--r-lg); padding:32px 28px; text-align:center;
  margin:36px 0 8px;
}
.sp-cta h3 { color:#fff; font-size:1.4rem; font-weight:800; margin-bottom:8px; letter-spacing:-.02em; }
.sp-cta p { color:rgba(255,255,255,.86); font-size:.95rem; max-width:46ch; margin:0 auto; }
.sp-cta .sp-btn { margin-top:18px; background:#fff; color:var(--primary); }
.sp-cta .sp-btn:hover { background:var(--primary-fixed); color:var(--primary-deep); }

/* ── Footer ────────────────────────────────────────────────────── */
.sp-footer { border-top:1px solid var(--outline-soft); background:var(--surface); margin-top:48px; }
.sp-footer__in { max-width:var(--maxw); margin:0 auto; padding:40px 16px 24px; }
.sp-footer__cols { display:grid; grid-template-columns:1.6fr 1fr 1fr 1fr; gap:28px; }
@media (max-width:720px) {
  .sp-footer__cols { grid-template-columns:1fr 1fr; gap:24px 16px; }
  .sp-footer__brand-col { grid-column:1 / -1; }
}
.sp-footer__logo { height:28px; width:auto; display:block; margin-bottom:12px; }
.sp-footer__tag { color:var(--on-surface-variant); font-size:.85rem; line-height:1.6; max-width:280px; }
.sp-footer__group h4 {
  font-size:.74rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase;
  color:var(--on-surface); margin-bottom:12px;
}
.sp-footer__group a { display:block; color:var(--on-surface-variant); font-size:.88rem; margin-bottom:8px; }
.sp-footer__group a:hover { color:var(--primary); }
.sp-footer__bottom {
  display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between;
  gap:14px; margin-top:32px; padding-top:18px;
  border-top:1px solid var(--outline-soft);
  color:var(--on-surface-faint); font-size:.8rem;
}
.sp-socials { display:flex; gap:10px; }
.sp-socials a {
  display:inline-flex; width:32px; height:32px; align-items:center; justify-content:center;
  border-radius:var(--r-full); color:var(--on-surface-faint); background:var(--surface-low);
  transition:all .15s;
}
.sp-socials a:hover { color:#fff; background:var(--primary); }
.sp-socials svg { width:16px; height:16px; }

/* ── Quiet helpers ─────────────────────────────────────────────── */
.sp-mt-0 { margin-top:0 !important; }
.sp-mb-0 { margin-bottom:0 !important; }
.sp-text-center { text-align:center; }
.sp-muted { color:var(--on-surface-faint); }