/* =========================================================================
   ACT module — consolidated stylesheet (hub, section pages, vs-sat, lesson)
   All colors use the site theme CSS variables (amber accent). Deduped from
   the former per-page inline <style> blocks.
   ========================================================================= */

/* ── Shared: scroll-reveal animation ───────────────────────────────────── */
.animate-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.animate-in.visible { opacity: 1; transform: translateY(0); }

/* ── Section head utility ──────────────────────────────────────────────── */
.lp-section-head { text-align: center; margin-bottom: 2rem; }
.lp-section-head h2 {
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 800;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  color: var(--text-primary);
  margin: 0.3rem 0 0.6rem;
}
.lp-section-head p {
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.65;
  max-width: 600px;
  margin: 0 auto;
}

/* ── Proof strip ───────────────────────────────────────────────────────── */
.proof-strip { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; margin-top: 1.5rem; }
.proof-item  { display: flex; align-items: center; gap: 6px; font-size: 0.82rem; color: var(--text-secondary); }
.proof-item i { color: var(--accent); font-size: 0.75rem; }

/* ── Hub: score-goal selector ──────────────────────────────────────────── */
.goal-card {
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 0.7rem 0.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  background: var(--bg-surface);
}
.goal-card:hover, .goal-card:focus-visible { border-color: var(--accent); outline: 2px solid var(--accent); outline-offset: 2px; }
.goal-card[aria-checked="true"] { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.goal-score { display: block; font-size: 1.35rem; font-weight: 800; color: var(--accent); font-family: Nunito, system-ui, sans-serif; }
.goal-label { display: block; font-size: 0.72rem; color: var(--text-secondary); margin-top: 2px; }

/* ── Hub: section cards ────────────────────────────────────────────────── */
.section-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
  text-decoration: none;
  display: block;
}
.section-card:hover, .section-card:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
  transform: translateY(-2px);
  outline: none;
}
.section-card:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.section-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; margin-bottom: 1rem;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
}
.section-meta { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.85rem; }
.section-meta .badge { font-size: 0.72rem; }

/* ── Key insight box (english/math: gradient variant) ──────────────────── */
.insight-box {
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 10%, transparent) 0%, color-mix(in srgb, var(--accent) 4%, transparent) 100%);
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  max-width: 780px;
  margin: 0 auto;
}
.insight-box .insight-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.65rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.insight-box p {
  color: var(--text-primary);
  font-size: 1rem;
  line-height: 1.75;
  margin: 0.5rem 0 0;
}
.insight-box strong { color: var(--text-primary); }

/* Reading: lighter left-border insight variant (overrides where used) */
.insight-box.insight-soft {
  border: none;
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent) 7%, transparent);
  padding: 1.5rem 1.75rem;
}
.insight-box.insight-soft p { color: var(--text-body); line-height: 1.75; font-size: 0.97rem; margin: 0; }

/* ── Big insight box (science) ─────────────────────────────────────────── */
.big-insight {
  background: var(--bg-surface);
  border: 2px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: clamp(1.75rem, 4vw, 2.5rem);
  max-width: 820px;
  margin: 0 auto;
  position: relative;
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent) 8%, transparent);
}
.big-insight-icon {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--text-inverse);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}
.big-insight h2 {
  color: var(--text-primary);
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 800;
  font-size: clamp(1.2rem, 2.8vw, 1.6rem);
  margin: 0 0 1rem;
}
.big-insight p {
  color: var(--text-body);
  font-size: clamp(0.93rem, 1.8vw, 1.02rem);
  line-height: 1.8;
  margin: 0;
}
.big-insight strong { color: var(--text-primary); }
.big-insight .highlight-phrase {
  display: inline-block;
  background: var(--accent);
  color: var(--text-inverse);
  border-radius: 4px;
  padding: 1px 7px;
  font-weight: 700;
  font-size: 0.95em;
}

/* ── Warning / no-formula-sheet callout (math) ─────────────────────────── */
.callout-warning {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 0.85rem 1.1rem;
  font-size: 0.92rem;
  color: var(--text-primary);
  line-height: 1.6;
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
}
.callout-warning i { color: var(--accent); margin-top: 2px; flex-shrink: 0; }

/* ── Domain heading (unit labels) ──────────────────────────────────────── */
.domain-heading {
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 800;
  font-size: 0.92rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin: 2rem 0 0.75rem;
  padding-left: 0.75rem;
  border-left: 4px solid var(--accent);
}

/* ── Skill cards (english/math) ────────────────────────────────────────── */
.skill-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  position: relative;
}
.skill-card:hover,
.skill-card:focus-visible {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 12%, transparent);
  outline: none;
}
.skill-card:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.skill-card h3 {
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 700;
  font-size: 0.97rem;
  color: var(--text-primary);
  margin: 0 0 0.4rem;
}
.skill-card .skill-meta { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.skill-code {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: Nunito, system-ui, sans-serif;
}

/* ── Passage / topic cards (reading, science) ──────────────────────────── */
.passage-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: border-color 0.2s, transform 0.2s;
}
.passage-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.passage-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
  margin-bottom: 0.85rem;
  flex-shrink: 0;
}
.passage-order-badge,
.qcount-badge {
  display: inline-flex; align-items: center;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 10px;
  margin-bottom: 0.5rem;
  letter-spacing: 0.04em;
}
.topic-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
  text-decoration: none;
  display: block;
}
.topic-card:hover, .topic-card:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
  transform: translateY(-2px);
  outline: none;
}
.topic-card:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.unit-label {
  font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--accent); margin-bottom: 0.4rem;
}
.topic-weight {
  display: inline-block;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 10px;
  margin-top: 0.75rem;
}

/* ── Demo question (shared across hub + all section pages) ──────────────── */
.demo-question {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  max-width: 720px;
  margin: 0 auto;
}
.demo-passage-box {
  background: var(--bg-elevated, var(--bg-base));
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--text-body);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 1.25rem;
}
.demo-passage {
  font-size: 0.9rem; line-height: 1.8; color: var(--text-body);
  background: var(--bg-base);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
  margin-bottom: 1.25rem;
}
.underline-target {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
  font-weight: 600;
  color: var(--text-primary);
}
.demo-stem { font-weight: 600; color: var(--text-primary); margin-bottom: 1rem; font-size: 0.95rem; line-height: 1.65; }
.demo-option {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.7rem 1rem;
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  background: var(--bg-base);
  margin-bottom: 0.5rem;
  text-align: left;
  width: 100%;
  font-size: 0.93rem;
  color: var(--text-body);
}
.demo-option:hover,
.demo-option:focus-visible { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 6%, transparent); }
.demo-option:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.demo-option.correct  { border-color: var(--success); background: color-mix(in srgb, var(--success) 8%, transparent); }
.demo-option.wrong    { border-color: var(--error); background: color-mix(in srgb, var(--error) 8%, transparent); }
.demo-option[disabled] { cursor: default; pointer-events: none; }
.demo-letter {
  min-width: 28px; height: 28px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700;
  background: var(--bg-surface); border: 2px solid var(--border-subtle);
  color: var(--text-secondary);
  flex-shrink: 0;
}
.demo-option.correct .demo-letter { background: var(--success); border-color: var(--success); color: var(--text-inverse); }
.demo-option.wrong   .demo-letter { background: var(--error); border-color: var(--error); color: var(--text-inverse); }
.demo-feedback {
  display: none;
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  margin-top: 0.75rem;
  font-size: 0.9rem;
  line-height: 1.65;
}
.demo-feedback.show { display: block; }
.demo-feedback.correct-fb { background: color-mix(in srgb, var(--success) 10%, transparent); border-left: 3px solid var(--success); color: var(--text-body); }
.demo-feedback.wrong-fb   { background: color-mix(in srgb, var(--error) 10%, transparent);  border-left: 3px solid var(--error); color: var(--text-body); }

/* ── Steps (hub) ───────────────────────────────────────────────────────── */
.step-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; }
.step-item { display: flex; gap: 1rem; align-items: flex-start; }
.step-num {
  min-width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--text-inverse);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1rem; font-family: Nunito, system-ui, sans-serif;
  flex-shrink: 0;
}

/* ── Stats strip (english/math) ────────────────────────────────────────── */
.stat-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}
.stat-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.5rem;
  text-align: center;
  min-width: 140px;
  flex: 1;
}
.stat-item .stat-val {
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 900;
  font-size: 1.75rem;
  color: var(--accent);
  display: block;
  line-height: 1;
}
.stat-item .stat-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
  display: block;
}

/* ── Formula cards (math) ──────────────────────────────────────────────── */
.formula-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  font-size: 0.9rem;
}
.formula-card .formula-title {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 0.88rem;
  margin-bottom: 0.35rem;
}
.formula-card .formula-expr {
  font-family: 'JetBrains Mono', monospace;
  color: var(--accent);
  font-size: 0.9rem;
  background: var(--bg-elevated, var(--bg-base));
  border-radius: 4px;
  padding: 0.3rem 0.6rem;
  display: inline-block;
  margin-top: 0.2rem;
}
.formula-card .formula-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
  line-height: 1.5;
}

/* ── Data table (science) ──────────────────────────────────────────────── */
.data-table { width: 100%; border-collapse: collapse; font-size: 0.87rem; margin-bottom: 1.25rem; }
.data-table th {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--text-primary);
  font-weight: 700;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--border-subtle);
  text-align: center;
}
.data-table th:first-child { text-align: left; }
.data-table td {
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--border-subtle);
  color: var(--text-body);
  text-align: center;
}
.data-table td:first-child { color: var(--text-primary); font-weight: 600; text-align: left; }
.data-table caption {
  caption-side: top;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-bottom: 0.5rem;
}

/* ── Strategy box (science) ────────────────────────────────────────────── */
.strategy-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  max-width: 780px;
  margin: 0 auto;
}
.strategy-box h3 {
  color: var(--text-primary);
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  margin: 0 0 0.85rem;
}
.strategy-step {
  display: flex; gap: 0.85rem; align-items: flex-start;
  margin-bottom: 0.9rem;
}
.strategy-step:last-child { margin-bottom: 0; }
.strategy-num {
  min-width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--text-inverse);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.8rem;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ── Pacing table (reading, science) ───────────────────────────────────── */
.pacing-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.pacing-table th { text-align: left; padding: 0.6rem 0.75rem; color: var(--text-secondary); font-weight: 600; border-bottom: 2px solid var(--accent); }
.pacing-table td { padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--border-subtle); color: var(--text-body); }
.pacing-table tr:last-child td { border-bottom: none; }
.pacing-table td:first-child { color: var(--text-primary); font-weight: 600; }
.pacing-highlight td { background: color-mix(in srgb, var(--accent) 6%, transparent); }

/* ── FAQ accordion (hub / section: chevron + .open body) ───────────────── */
.faq-item { border-bottom: 1px solid var(--border-subtle); }
.faq-btn {
  display: flex; justify-content: space-between; align-items: center;
  width: 100%; padding: 1.1rem 0;
  background: none; border: none; cursor: pointer;
  text-align: left; gap: 1rem;
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}
.faq-btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.faq-chevron { transition: transform 0.25s; color: var(--accent); flex-shrink: 0; }
.faq-btn[aria-expanded="true"] .faq-chevron { transform: rotate(180deg); }
.faq-body {
  display: none;
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease;
  color: var(--text-body);
  font-size: 0.93rem;
  line-height: 1.7;
  padding-bottom: 0;
}
.faq-body.open { display: block; max-height: 400px; padding-bottom: 1rem; }
.faq-body > div { padding-bottom: 1rem; }

/* ── FAQ accordion (vs-sat: boxed .faq-q / .faq-a) ─────────────────────── */
.faq-item.faq-boxed { border: 1px solid var(--border-subtle); border-radius: var(--radius); margin-bottom: 0.75rem; background: var(--bg-surface); overflow: hidden; }
.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 700;
  font-size: 1rem;
  padding: 1.1rem 1.25rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  min-height: 52px;
}
.faq-q:focus-visible { outline: 3px solid var(--accent); outline-offset: -3px; }
.faq-q .chevron { color: var(--accent); transition: transform 0.25s ease; flex-shrink: 0; }
.faq-q[aria-expanded="true"] .chevron { transform: rotate(180deg); }
.faq-a { padding: 0 1.25rem; max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; }
.faq-a[data-open="true"] { padding: 0 1.25rem 1.2rem; max-height: 500px; }
.faq-a p { color: var(--text-body); line-height: 1.7; margin: 0; }

/* =========================================================================
   vs-sat comparison page
   ========================================================================= */
.vs-callout {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-left: 5px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  max-width: 820px;
  margin: 0 auto;
}
.vs-callout p { color: var(--text-body); line-height: 1.75; margin: 0; font-size: 1.02rem; }

.vs-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border-radius: var(--radius-lg); border: 1px solid var(--border-subtle); }
table.vs-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  background: var(--bg-surface);
}
table.vs-table caption {
  text-align: left;
  padding: 1rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border-subtle);
}
table.vs-table th, table.vs-table td {
  padding: 0.85rem 1.1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.92rem;
  line-height: 1.55;
}
table.vs-table thead th {
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 800;
  position: sticky;
  top: 0;
}
table.vs-table thead th:first-child { color: var(--accent); }
table.vs-table th[scope="row"] {
  color: var(--text-primary);
  font-weight: 700;
  white-space: nowrap;
}
table.vs-table td { color: var(--text-body); }
table.vs-table tbody tr:last-child th,
table.vs-table tbody tr:last-child td { border-bottom: none; }
table.vs-table tbody tr:hover { background: color-mix(in srgb, var(--accent) 5%, transparent); }

.choose-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.choose-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}
.choose-card.act { border-top: 4px solid var(--accent); }
.choose-card.sat { border-top: 4px solid var(--success); }
.choose-card h3 { font-size: 1.25rem; margin-bottom: 1rem; color: var(--text-primary); }
.choose-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.7rem; }
.choose-list li { display: flex; gap: 0.65rem; align-items: flex-start; color: var(--text-body); line-height: 1.55; font-size: 0.95rem; }
.choose-list li i { margin-top: 0.25rem; flex-shrink: 0; }
.choose-card.act .choose-list li i { color: var(--accent); }
.choose-card.sat .choose-list li i { color: var(--success); }

.breakdown-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  height: 100%;
}
.breakdown-card h3 { font-size: 1.1rem; margin-bottom: 0.75rem; color: var(--text-primary); display: flex; align-items: center; gap: 0.55rem; }
.breakdown-card h3 i { color: var(--accent); }
.breakdown-card p { color: var(--text-body); line-height: 1.65; margin: 0; font-size: 0.92rem; }

.quiz-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  max-width: 720px;
  margin: 0 auto;
}
.quiz-q { border: none; padding: 0; margin: 0 0 1.5rem; }
.quiz-q legend {
  font-family: Nunito, system-ui, sans-serif;
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 0.85rem;
  padding: 0;
}
.quiz-q legend .q-num { color: var(--accent); margin-right: 0.4rem; }
.quiz-opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.75rem; }
.quiz-btn {
  display: flex; align-items: center; gap: 0.65rem;
  text-align: left;
  padding: 0.9rem 1.1rem;
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius);
  background: var(--bg-base);
  color: var(--text-body);
  font: inherit;
  font-size: 0.92rem;
  line-height: 1.4;
  cursor: pointer;
  min-height: 52px;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
  width: 100%;
}
.quiz-btn:hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 6%, transparent); }
.quiz-btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.quiz-btn[aria-pressed="true"] {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--text-primary);
  font-weight: 600;
}
.quiz-btn .pick {
  width: 22px; height: 22px; flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--border-subtle);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.7rem;
}
.quiz-btn[aria-pressed="true"] .pick { background: var(--accent); border-color: var(--accent); color: var(--text-inverse); }

#quiz-result {
  margin-top: 0.5rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-left: 5px solid var(--accent);
  display: none;
}
#quiz-result.show { display: block; }
#quiz-result h3 { color: var(--text-primary); margin: 0 0 0.4rem; font-size: 1.2rem; }
#quiz-result p { color: var(--text-body); margin: 0; line-height: 1.6; }
.quiz-progress { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 1.25rem; }

/* =========================================================================
   Lesson page
   ========================================================================= */
.act-lhdr { position: sticky; top: 0; z-index: 60; background: var(--bg-base); border-bottom: 1px solid var(--border-subtle); padding: 0.55rem 0; }
.act-lhdr .container { display: flex; flex-direction: column; gap: 0.3rem; }
.act-bc { display: flex; align-items: center; gap: 0.4rem; font-size: 0.78rem; color: var(--text-secondary); flex-wrap: wrap; list-style: none; padding: 0; margin: 0; }
.act-bc a { color: var(--text-secondary); text-decoration: none; }
.act-bc a:hover { color: var(--accent); }
.act-bc .sep { color: var(--border-subtle); }
.act-bc .cur { color: var(--text-primary); font-weight: 600; }
.act-prog-bar { height: 3px; background: var(--border-subtle); border-radius: 2px; overflow: hidden; }
.act-prog-fill { height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.5s ease; }
.act-nav-row { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; padding: 0.35rem 0; }
.act-nav-center { color: var(--text-secondary); font-size: 0.8rem; font-weight: 600; }
.snav { display: inline-flex; align-items: center; gap: 0.35rem; padding: 0.35rem 0.8rem; border: 1px solid var(--border-subtle); border-radius: 6px; font-size: 0.8rem; font-weight: 600; color: var(--text-body); text-decoration: none; background: var(--bg-surface); transition: border-color 0.15s, color 0.15s; }
.snav:hover, .snav:focus-visible { border-color: var(--accent); color: var(--accent); }
.snav:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.snav.off { opacity: 0.35; pointer-events: none; }

.lb { opacity: 0; transform: translateY(14px); transition: opacity 0.4s ease, transform 0.4s ease; }
.lb.in { opacity: 1; transform: none; }

.bwrap { background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: var(--radius-lg, 12px); padding: 1.5rem; margin-bottom: 1.5rem; }

/* INTRO */
.hook-box { background: color-mix(in srgb, var(--accent) 12%, var(--bg-elevated)); border-left: 5px solid var(--accent); border-radius: 8px; padding: 1.1rem 1.25rem; margin-bottom: 1rem; }
.hook-text { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); line-height: 1.45; }
.score-pill { display: inline-flex; align-items: center; gap: 0.45rem; background: var(--accent); color: var(--text-inverse); border-radius: 20px; padding: 0.28rem 0.85rem; font-size: 0.82rem; font-weight: 700; margin-bottom: 0.9rem; }
.obj-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.45rem; }
.obj-list li { display: flex; align-items: flex-start; gap: 0.6rem; font-size: 0.92rem; color: var(--text-body); line-height: 1.5; }
.obj-list input[type="checkbox"] { margin-top: 0.15rem; accent-color: var(--accent); width: 0.95rem; height: 0.95rem; flex-shrink: 0; cursor: pointer; }
.obj-list label { cursor: pointer; }

/* CONCEPT */
.rule-card { border: 2px solid var(--accent); border-radius: 10px; padding: 1.1rem 1.25rem; margin-bottom: 1rem; background: var(--bg-base); }
.rule-card .rule-label { font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--accent); margin: 0 0 0.4rem; }
.rule-card p { font-size: 1.05rem; color: var(--text-primary); line-height: 1.55; margin: 0; }
.how-list { list-style: none; padding: 0; margin: 0 0 1rem; display: flex; flex-direction: column; gap: 0.4rem; }
.how-list li { display: flex; gap: 0.5rem; font-size: 0.88rem; color: var(--text-body); line-height: 1.55; }
.how-list li::before { content: "→"; color: var(--accent); font-weight: 700; flex-shrink: 0; }
.concept-sec { margin-bottom: 1.25rem; }
.concept-sec h3 { font-size: 0.98rem; font-weight: 700; color: var(--text-primary); margin: 0 0 0.5rem; }
.concept-sec p, .concept-sec li { font-size: 0.9rem; color: var(--text-body); line-height: 1.6; }
.steps-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.65rem; }
.steps-list li { display: flex; align-items: flex-start; gap: 0.65rem; }
.steps-list .step-num { min-width: 1.85rem; height: 1.85rem; border-radius: 50%; background: var(--accent); color: var(--text-inverse); font-weight: 700; font-size: 0.8rem; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 0.1rem; }
.step-txt { font-size: 0.9rem; color: var(--text-body); line-height: 1.55; padding-top: 0.2rem; }

/* WORKED EXAMPLES */
.diff-filters { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 1rem; }
.dfilter { padding: 0.28rem 0.75rem; border: 1px solid var(--border-subtle); border-radius: 20px; font-size: 0.78rem; font-weight: 600; background: var(--bg-base); color: var(--text-secondary); cursor: pointer; transition: background 0.15s, border-color 0.15s; }
.dfilter.on, .dfilter:hover { background: var(--accent); border-color: var(--accent); color: var(--text-inverse); }
.dfilter:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.ex-card { border: 1px solid var(--border-subtle); border-radius: 10px; overflow: hidden; margin-bottom: 1.1rem; background: var(--bg-base); }
.ex-head { display: flex; align-items: center; gap: 0.6rem; padding: 0.6rem 0.9rem; background: var(--bg-surface); border-bottom: 1px solid var(--border-subtle); }
.diff-badge { padding: 0.2rem 0.55rem; border-radius: 4px; font-size: 0.75rem; font-weight: 700; }
.diff-easy   { background: var(--success-bg); color: var(--success); }
.diff-medium { background: color-mix(in srgb, var(--accent) 22%, var(--bg-elevated)); color: var(--accent-light); }
.diff-hard   { background: var(--error-bg); color: var(--error); }
.trap-badge { font-size: 0.72rem; color: var(--text-secondary); margin-left: auto; }
.passage-box { background: var(--bg-elevated); border-left: 3px solid var(--accent); padding: 0.85rem 1rem; margin: 0.85rem; font-size: 0.88rem; color: var(--text-body); line-height: 1.7; border-radius: 0 6px 6px 0; }
.q-stem { padding: 0 0.9rem; font-size: 0.92rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.6rem; }
.opts { list-style: none; padding: 0 0.9rem 0.9rem; margin: 0; display: flex; flex-direction: column; gap: 0.4rem; }
.opts li { font-size: 0.87rem; color: var(--text-body); line-height: 1.5; }
.reveal-btn { display: block; margin: 0.5rem 0.9rem; padding: 0.4rem 0.9rem; background: var(--bg-surface); border: 1px solid var(--border-subtle); border-radius: 6px; font-size: 0.82rem; font-weight: 600; color: var(--text-secondary); cursor: pointer; text-align: left; transition: background 0.15s; width: calc(100% - 1.8rem); }
.reveal-btn:hover, .reveal-btn:focus-visible { background: var(--accent); border-color: var(--accent); color: var(--text-inverse); }
.reveal-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.reveal-btn[aria-expanded="true"] { background: var(--bg-elevated); }
.sol-panel { display: none; border-top: 1px solid var(--border-subtle); padding: 0.75rem 0.9rem; }
.sol-panel.open { display: block; animation: slideDown 0.25s ease; }
@keyframes slideDown { from { opacity:0; transform:translateY(-6px); } to { opacity:1; transform:none; } }
.sol-step { border-bottom: 1px solid var(--border-subtle); padding: 0.5rem 0; display: none; }
.sol-step:last-child { border-bottom: none; }
.sol-step.vis { display: block; }
.sol-step strong { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--accent); }
.sol-step p { font-size: 0.87rem; color: var(--text-body); margin: 0.2rem 0 0; line-height: 1.5; }
.step-btns { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-top: 0.5rem; }
.step-btn { padding: 0.28rem 0.7rem; border: 1px solid var(--border-subtle); border-radius: 6px; font-size: 0.78rem; font-weight: 600; cursor: pointer; background: var(--bg-surface); color: var(--text-secondary); transition: background 0.15s; }
.step-btn:hover, .step-btn:focus-visible { background: var(--accent); border-color: var(--accent); color: var(--text-inverse); }
.step-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.expl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.65rem; margin: 0.75rem 0.9rem; padding: 0.9rem; background: var(--bg-surface); border-radius: 8px; }
.expl-col h5 { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; margin: 0 0 0.4rem; }
.expl-col.right h5 { color: var(--success); }
.expl-col.wrong h5  { color: var(--error); }
.expl-col p { font-size: 0.83rem; color: var(--text-body); margin: 0; line-height: 1.5; }

/* STRATEGY TIPS */
.tips-list { list-style: none; padding: 0; margin: 0 0 1rem; display: flex; flex-direction: column; gap: 0.55rem; }
.tip-item { display: flex; align-items: flex-start; gap: 0.65rem; font-size: 0.9rem; color: var(--text-body); line-height: 1.55; }
.tip-icon { color: var(--accent); font-size: 0.92rem; flex-shrink: 0; margin-top: 0.15rem; }
.pitfall { border-left: 4px solid var(--error); background: var(--error-bg); border-radius: 0 8px 8px 0; padding: 0.75rem 1rem; margin-bottom: 0.65rem; }
.pitfall p { font-size: 0.87rem; color: var(--error); margin: 0; line-height: 1.55; }
.timing-box { background: color-mix(in srgb, var(--accent) 12%, var(--bg-elevated)); border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); border-radius: 8px; padding: 0.85rem 1.1rem; display: flex; gap: 0.65rem; align-items: flex-start; }
.timing-box .ti { color: var(--accent); font-size: 1.1rem; margin-top: 0.1rem; flex-shrink: 0; }
.timing-box p { font-size: 0.87rem; color: var(--text-body); margin: 0; line-height: 1.55; }

/* SUMMARY */
.tk-list { list-style: none; padding: 0; margin: 0 0 1.25rem; display: flex; flex-direction: column; gap: 0.55rem; }
.tk-item { display: flex; align-items: flex-start; gap: 0.65rem; font-size: 0.9rem; color: var(--text-body); line-height: 1.55; }
.tk-icon { color: var(--success); font-size: 0.92rem; flex-shrink: 0; margin-top: 0.15rem; }
.next-lesson-link { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.6rem 1.25rem; border: 1px solid var(--accent); border-radius: 8px; font-size: 0.88rem; font-weight: 700; color: var(--accent); text-decoration: none; transition: background 0.15s; }
.next-lesson-link:hover, .next-lesson-link:focus-visible { background: var(--accent); color: var(--text-inverse); }
.next-lesson-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btitle { font-size: 1.05rem; font-weight: 800; color: var(--text-primary); margin: 0 0 1rem; display: flex; align-items: center; gap: 0.5rem; }
.btitle i { color: var(--accent); }

/* ── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .insight-box { padding: 1.1rem 1.25rem; }
}
@media (max-width: 540px) {
  .expl-grid { grid-template-columns: 1fr; }
}

/* ── Reduced motion ────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .animate-in { transition: none; opacity: 1; transform: none; }
  .section-card, .skill-card, .passage-card, .topic-card { transition: none; }
  .faq-chevron { transition: none; }
  .quiz-btn, .faq-q .chevron, .faq-a { transition: none !important; }
  .lb { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ── Lesson section nav (sticky pills, scrollspy) ──────────────────────────── */
.act-secnav { display: flex; gap: 0.4rem; overflow-x: auto; padding: 0.5rem 0 0.15rem; margin-top: 0.35rem; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
.act-secnav::-webkit-scrollbar { display: none; }
.act-secnav-pill {
  display: inline-flex; align-items: center; gap: 0.4rem; flex: 0 0 auto;
  padding: 0.32rem 0.8rem; border-radius: 999px;
  font-size: 0.78rem; font-weight: 600; text-decoration: none; white-space: nowrap;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}
.act-secnav-pill i { font-size: 0.72rem; }
.act-secnav-pill:hover, .act-secnav-pill:focus-visible {
  color: var(--accent); border-color: var(--accent);
}
.act-secnav-pill:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.act-secnav-pill.active {
  color: var(--text-inverse);
  background: var(--accent);
  border-color: var(--accent);
}
/* Offset scroll so the sticky header doesn't cover the section heading */
.bwrap[id^="sec-"] { scroll-margin-top: 7.5rem; }
@media (prefers-reduced-motion: reduce) {
  .act-secnav-pill { transition: none; }
}