/* Chapter catalogue: a presentation layer around the existing practice engine. */
.practice-catalogue {
  --catalogue-ink: #20241f;
  --catalogue-muted: #687068;
  --catalogue-line: #e1e5de;
  --catalogue-orange: #ff702a;
  --catalogue-emerald: #16775b;
  color: var(--catalogue-ink);
  max-width: 1320px;
  margin: 0 auto;
}
.practice-catalogue .catalogue-heading { align-items: center; margin: 0 0 17px; }
.practice-catalogue .catalogue-heading .eyebrow {
  display: block; margin: 0 0 8px; color: #7b8178;
  font-size: 10px; font-weight: 650; letter-spacing: .15em;
}
.practice-catalogue .catalogue-heading h1 {
  font-family: Manrope, Inter, sans-serif;
  font-size: clamp(27px, 2.55vw, 36px); font-weight: 700;
  line-height: 1.2; letter-spacing: -.045em;
}
.practice-catalogue .catalogue-heading p { font-size: 13px; line-height: 1.65; margin-top: 9px; color: var(--catalogue-muted); }
.practice-catalogue .catalogue-heading > .btn { min-height: 40px; padding: 10px 14px; white-space: nowrap; font-size: 12px; }
.practice-catalogue .catalogue-tabs {
  display: flex; gap: 4px; margin: 0; padding: 0;
  border-bottom: 1px solid var(--catalogue-line);
}
.practice-catalogue .catalogue-tabs button {
  position: relative; display: flex; align-items: center; gap: 8px;
  flex: 0 1 auto; min-height: 47px; padding: 10px 18px;
  background: transparent; border: 0; border-radius: 0; box-shadow: none;
}
.practice-catalogue .catalogue-tabs button:first-child { padding-left: 0; padding-right: 22px; }
.practice-catalogue .catalogue-tabs button strong { font-size: 12px; letter-spacing: .01em; color: #434b42; }
.practice-catalogue .catalogue-tabs button span { font-size: 12px; color: #7a8077; }
.practice-catalogue .catalogue-tabs button.active { background: transparent; }
.practice-catalogue .catalogue-tabs button.active::after {
  content: ''; position: absolute; height: 2px; bottom: -1px; left: 12px; right: 12px;
  background: var(--catalogue-orange); border-radius: 2px;
}
.practice-catalogue .catalogue-tabs button.active:first-child::after { left: 0; }
.practice-catalogue .catalogue-tabs button.active strong { color: #af4213; }
.practice-catalogue .catalogue-tabs button.active span { color: #4f514a; }
.practice-catalogue .catalogue-topline {
  min-height: 48px; padding: 12px 0; margin: 0 0 15px;
  border-bottom: 1px solid var(--catalogue-line); color: #788075;
  font-size: 11px; line-height: 1.65; gap: 12px;
}
.practice-catalogue .catalogue-topline > div { display: flex; flex-wrap: wrap; column-gap: 5px; row-gap: 3px; align-items: baseline; }
.practice-catalogue .catalogue-topline strong { font-weight: 650; color: #394337; font-variant-numeric: tabular-nums; }
.practice-catalogue .catalogue-topline > div > span { margin: 0 7px; color: #acb3a7; }
.practice-catalogue .catalogue-topline > span { white-space: nowrap; }
.practice-catalogue .catalogue-categories {
  display: flex; align-items: center; flex-wrap: wrap; gap: 5px;
  margin: 0 0 15px; padding: 0;
}
.practice-catalogue .catalogue-categories button {
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 34px; padding: 8px 12px; border-radius: 7px;
  border: 1px solid transparent; background: transparent;
  color: #697164; font: inherit; font-size: 11px; font-weight: 500;
  cursor: pointer; transition: background .16s, border-color .16s, color .16s;
}
.practice-catalogue .catalogue-categories button:hover { color: #222a20; background: #ecefe7; }
.practice-catalogue .catalogue-categories button[aria-pressed="true"] {
  color: #f8faf6; background: #252c23; border-color: #252c23;
}
.practice-catalogue .catalogue-categories button span { opacity: .7; font-size: 10px; }
.practice-catalogue .catalogue-tools {
  display: flex; align-items: center; gap: 18px; padding: 0;
  margin: 0 0 24px; border: 0; background: transparent;
}
.practice-catalogue .catalogue-tools .search-box {
  flex: 1 1 260px; width: auto; max-width: 430px; min-width: 160px;
  min-height: 43px; border: 1px solid #dfe4da; border-radius: 9px;
  background: #fff; color: #7d8577; padding: 0 13px;
  transition: border-color .16s, box-shadow .16s;
}
.practice-catalogue .catalogue-tools .search-box:focus-within { border-color: #5c927a; box-shadow: 0 0 0 3px #16775b0d; }
.practice-catalogue .catalogue-tools .search-box input { min-width: 0; min-height: 41px; width: 100%; font-size: 12px; color: #30382c; }
.practice-catalogue .catalogue-tools .search-box input::placeholder { color: #858c7f; }
.practice-catalogue .catalogue-access { gap: 7px; font-size: 11px; color: #6a7363; white-space: nowrap; }
.practice-catalogue .catalogue-access input { width: 14px; height: 14px; accent-color: var(--catalogue-emerald); }
.practice-catalogue .mega-difficulty { flex: 0 0 242px; max-width: 260px; min-width: 220px; margin-left: auto; }
.practice-catalogue .mega-difficulty > label { font-size: 11px; }
.practice-catalogue .mega-difficulty > label strong { font-size: 11px; font-weight: 650; }
.practice-catalogue .mega-difficulty > .mega-range { height: 30px; margin: 3px 0 0; }
.practice-catalogue .mega-difficulty .mega-range input { height: 30px; }
.practice-catalogue .mega-range::before { inset: 6px 3px; }
.practice-catalogue .mega-range-fill { top: 6px; height: 18px; width: calc(12px + var(--position) * (100% - 24px) / var(--steps, 2)); }
.practice-catalogue .mega-range-thumb { top: 3px; width: 24px; height: 24px; left: calc(3px + var(--position) * (100% - 30px) / var(--steps, 2)); }
.practice-catalogue .mega-range-ticks { inset: 6px 12px; }
.practice-catalogue .mega-range input::-webkit-slider-runnable-track { height: 18px; }
.practice-catalogue .mega-range input::-moz-range-track { height: 18px; }
.practice-catalogue .mega-range input::-webkit-slider-thumb { width: 24px; height: 24px; margin-top: -3px; }
.practice-catalogue .mega-range input::-moz-range-thumb { width: 24px; height: 24px; }
.practice-catalogue .mega-difficulty .text-link { min-height: 25px; font-size: 10px; }
.practice-catalogue .mega-difficulty .mega-easy-choice { display: block; min-height: 20px; margin-top: 0; font-size: 10px; color: #7a8174; }
.practice-catalogue .topic-catalogue { display: flex; flex-direction: column; gap: 32px; }
.practice-catalogue .topic-group { margin: 0; padding: 0; border: 0; border-radius: 0; background: transparent; overflow: visible; box-shadow: none; }
.practice-catalogue .topic-group-heading {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 0 1px 14px; border: 0; background: transparent;
}
.practice-catalogue .topic-group-heading h2 { font-family: Manrope, Inter, sans-serif; font-size: 18px; line-height: 1.4; font-weight: 700; letter-spacing: -.025em; }
.practice-catalogue .topic-group-heading > span { font-size: 11px; color: #7e8678; }
.practice-catalogue .chapter-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 17px; }
.practice-catalogue .chapter-card {
  display: flex; flex-direction: column; align-items: stretch; min-width: 0;
  padding: 0; gap: 0; border: 1px solid #dfe4da; border-radius: 13px;
  overflow: hidden; background: #fff; box-shadow: 0 2px 3px #24391a03;
  transition: border-color .18s, box-shadow .18s, transform .18s;
}
.practice-catalogue .chapter-card:hover { border-color: #bac9b5; box-shadow: 0 7px 20px #2132190a; transform: translateY(-2px); }
.practice-catalogue .chapter-card:focus-within { border-color: #5f9377; box-shadow: 0 0 0 3px #16775b0d; }
.practice-catalogue .chapter-art {
  position: relative; display: flex; align-items: center; justify-content: flex-start;
  min-height: 106px; padding: 12px 18px;
  background: linear-gradient(115deg,#f1f2ea,#faf9f4); border-bottom: 1px solid #edf0e8;
  color: #3c4737;
}
.practice-catalogue .chapter-art > svg { display: block; width: 108px; height: 81px; overflow: visible; flex-shrink: 0; }
.practice-catalogue .art-accent { stroke: #ed6b30; }
.practice-catalogue .art-fill { fill: #ed6b3017; }
.practice-catalogue .chapter-count {
  position: absolute; top: 15px; right: 14px; padding: 5px 8px; border-radius: 5px;
  border: 1px solid #dedfd3; background: #ffffff80;
  color: #6b7260; font-size: 10px; font-weight: 500; white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.practice-catalogue .chapter-body { display: flex; flex-direction: column; flex: 1; min-width: 0; padding: 19px 19px 16px; }
.practice-catalogue .chapter-body h3 { font-size: 16px; font-weight: 650; letter-spacing: -.025em; line-height: 1.5; margin: 0; color: #282f24; }
.practice-catalogue .chapter-body h3 a { color: inherit; text-decoration: none; }
.practice-catalogue .chapter-body h3 a:hover { color: #b4491c; }
.practice-catalogue .chapter-description { color: #697461; font-size: 12px; line-height: 1.7; min-height: 40px; margin: 6px 0 12px; }
.practice-catalogue .chapter-meta { display: flex; flex-wrap: wrap; column-gap: 10px; row-gap: 4px; font-size: 11px; line-height: 1.6; color: #697460; }
.practice-catalogue .chapter-meta > span { display: inline-flex; align-items: center; gap: 4px; }
.practice-catalogue .chapter-meta svg { width: 12px; height: 12px; }
.practice-catalogue .chapter-progress { margin: auto 0 0; padding-top: 17px; }
.practice-catalogue .progress-segments { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 4px; width: 100%; height: 4px; }
.practice-catalogue .progress-segments span { display: block; width: 100%; height: 4px; background: #edf0e8; border-radius: 3px; overflow: hidden; }
.practice-catalogue .progress-segments i { display: block; height: 100%; background: #1b8666; border-radius: inherit; }
.practice-catalogue .chapter-progress-label { display: flex; justify-content: space-between; gap: 8px; color: #6e7966; font-size: 10px; line-height: 1.6; margin-top: 7px; }
.practice-catalogue .chapter-actions { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 17px; padding-top: 13px; border-top: 1px solid #edf0e8; }
.practice-catalogue .chapter-explore { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; color: #5d6b51; font-size: 11px; font-weight: 550; text-decoration: none; }
.practice-catalogue .chapter-explore:hover { color: #b4491c; }
.practice-catalogue .chapter-explore svg { width: 13px; height: 13px; }
.practice-catalogue .chapter-actions .btn { min-height: 36px; width: auto; flex: 0 0 auto; padding: 8px 12px; border-radius: 6px; font-size: 11px; font-weight: 600; gap: 9px; }
.practice-catalogue .chapter-actions .btn svg { width: 13px; height: 13px; }
.practice-catalogue .btn.primary { background: var(--catalogue-orange); border-color: var(--catalogue-orange); color: #211b13; }
.practice-catalogue .btn.primary:hover { background: #f46420; border-color: #f46420; }
.practice-catalogue .btn.outline { border-color: #dce3d7; background: #fff; color: #53634a; }
.practice-catalogue .btn.outline:hover { background: #f4f7f0; border-color: #bdcbb4; }
.practice-catalogue .catalogue-resume { margin: 10px 0 20px; padding: 15px 18px; background: #edf5ee; border: 1px solid #d4e4d4; border-radius: 10px; }
.practice-catalogue .catalogue-resume small { color: #61765c; }
.practice-catalogue .catalogue-bottom { border-top: 1px solid var(--catalogue-line); margin-top: 34px; padding: 18px 0 0; color: #7a8473; font-size: 11px; }
.practice-catalogue .catalogue-bottom .text-link { font-size: 11px; color: #4e6850; }
.practice-catalogue .footnote { font-size: 10px; line-height: 1.75; color: #7d8677; max-width: 100ch; margin-top: 12px; }
.practice-catalogue .empty-state { background: #fff; border: 1px dashed #d8dfd0; border-radius: 12px; padding: 48px 20px; }
.practice-catalogue :is(a,button,input):focus-visible { outline: 2px solid #17815f; outline-offset: 4px; }
.practice-catalogue .search-box input:focus-visible { outline: 0; }

/* Topic overview uses real difficulty pools and the existing preparation flow. */
.practice-catalogue .topic-back { display: inline-flex; align-items: center; gap: 7px; color: #6a7561; font-size: 12px; min-height: 30px; margin: 0 0 16px; text-decoration: none; }
.practice-catalogue .topic-back:hover { color: #b4491c; }
.practice-catalogue .topic-back svg { width: 14px; height: 14px; }
.practice-catalogue .topic-hero {
  display: grid; grid-template-columns: 118px minmax(0,1fr) auto; align-items: center;
  gap: 24px; padding: 32px; border-radius: 14px; background: #222a22;
  color: #f5f7f1; border: 1px solid #344132;
}
.practice-catalogue .topic-hero-art { display: flex; align-items: center; justify-content: center; width: 118px; height: 116px; border: 1px solid #ffffff13; border-radius: 12px; background: #ffffff04; color: #dce8d3; }
.practice-catalogue .topic-hero-art svg { display: block; width: 110px; height: 83px; }
.practice-catalogue .topic-hero-art .art-accent { stroke: #ff8b51; }
.practice-catalogue .topic-hero-art .art-fill { fill: #ff8b511a; }
.practice-catalogue .topic-hero-copy { min-width: 0; }
.practice-catalogue .topic-hero-copy .eyebrow { display: block; color: #e5a274; font-size: 10px; font-weight: 600; letter-spacing: .13em; margin-bottom: 9px; }
.practice-catalogue .topic-hero-copy h1 { font: 700 clamp(25px,2.3vw,32px)/1.25 Manrope,Inter,sans-serif; color: #f6f8f1; letter-spacing: -.035em; margin: 0; }
.practice-catalogue .topic-hero-copy p { color: #b4c0aa; font-size: 12px; line-height: 1.8; max-width: 58ch; margin: 9px 0 0; }
.practice-catalogue .topic-hero-copy .chapter-meta { color: #a7b79a; margin-top: 13px; }
.practice-catalogue .topic-hero-actions { display: flex; flex-direction: column; gap: 9px; min-width: 155px; }
.practice-catalogue .topic-hero-actions .btn { width: 100%; min-height: 41px; font-size: 12px; justify-content: center; border-radius: 7px; }
.practice-catalogue .topic-hero-actions .btn.outline { background: transparent; border-color: #ffffff29; color: #dce4d5; }
.practice-catalogue .topic-hero-actions .btn.outline:hover { background: #ffffff0b; }
.practice-catalogue .topic-hero-actions > span { font-size: 10px; line-height: 1.6; color: #a9b79e; text-align: center; }
.practice-catalogue .topic-detail-stats { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 0; padding: 24px 0; margin-bottom: 25px; border-bottom: 1px solid var(--catalogue-line); }
.practice-catalogue .topic-detail-stats > div { padding: 0 24px; border-right: 1px solid var(--catalogue-line); }
.practice-catalogue .topic-detail-stats > div:first-child { padding-left: 0; }
.practice-catalogue .topic-detail-stats > div:last-child { border: 0; }
.practice-catalogue .topic-detail-stats strong { display: block; font-size: 23px; letter-spacing: -.035em; line-height: 1.4; font-weight: 650; font-variant-numeric: tabular-nums; }
.practice-catalogue .topic-detail-stats span,.practice-catalogue .topic-detail-stats small { display: block; color: #7a8473; font-size: 11px; line-height: 1.6; margin-top: 4px; }
.practice-catalogue .topic-detail-stats strong small { display: inline; font-size: 15px; font-weight: 500; letter-spacing: 0; color: #7c8972; }
.practice-catalogue .topic-difficulty-section > header { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 16px; }
.practice-catalogue .topic-difficulty-section h2 { font: 700 19px/1.4 Manrope,Inter,sans-serif; letter-spacing: -.025em; }
.practice-catalogue .topic-difficulty-section header p,.practice-catalogue .topic-difficulty-section header > span { color: #7c8673; font-size: 11px; line-height: 1.7; margin-top: 5px; }
.practice-catalogue .topic-difficulty-section > .topic-group-heading { align-items: baseline; margin: 0 0 2px; }
.practice-catalogue .topic-difficulty-section > .topic-group-heading p { color: #727e68; font-size: 12px; line-height: 1.7; margin-top: 5px; }
.practice-catalogue .topic-difficulty-list { border: 1px solid #dfe5d7; border-radius: 12px; overflow: hidden; background: #fff; }
.practice-catalogue .topic-difficulty-row { position: relative; display: flex; align-items: center; gap: 22px; padding: 22px 24px; border-bottom: 1px solid #e8ede1; }
.practice-catalogue .topic-difficulty-row:last-child { border-bottom: 0; }
.practice-catalogue .topic-difficulty-row.selected { background: #f6f9f2; }
.practice-catalogue .topic-difficulty-row.selected::before { content: ''; width: 3px; position: absolute; inset: 0 auto 0 0; background: #238767; }
.practice-catalogue .topic-difficulty-copy { flex: 1; min-width: 0; }
.practice-catalogue .topic-difficulty-copy h3 { display: flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 650; letter-spacing: -.015em; }
.practice-catalogue .topic-difficulty-copy p { color: #7c8673; font-size: 11px; line-height: 1.7; margin-top: 5px; }
.practice-catalogue .topic-difficulty-copy small { color: #8c9464; font-size: 10px; }
.practice-catalogue .topic-difficulty-copy .difficulty-current { display: inline-flex; padding: 3px 6px; background: #e9f1e4; color: #3e7953; font-size: 9px; font-weight: 500; border-radius: 4px; }
.practice-catalogue .topic-difficulty-progress { width: 170px; flex: 0 0 170px; }
.practice-catalogue .topic-difficulty-progress small { display: block; color: #7c8673; font-size: 10px; margin-top: 7px; line-height: 1.5; }
.practice-catalogue .topic-difficulty-row > .btn { min-width: 110px; min-height: 38px; padding: 9px 13px; font-size: 11px; border-radius: 6px; }
.practice-catalogue .topic-format-note { display: flex; flex-direction: column; gap: 3px; margin: 22px 0; padding: 17px 20px; background: #eff4ea; border: 1px solid #dce7d2; border-radius: 9px; font-size: 12px; color: #627256; line-height: 1.8; }
.practice-catalogue .topic-format-note strong { color: #43583a; font-size: 12px; }
.practice-catalogue .topic-format-note p { margin: 4px 0 0; }
.practice-catalogue .topic-format-note svg { flex: 0 0 18px; margin-top: 2px; }
.practice-catalogue .catalogue-notice { padding: 12px 15px; background: #fff5e9; border: 1px solid #f0dfc5; border-radius: 8px; color: #825422; font-size: 12px; margin-bottom: 17px; }
.practice-catalogue :is(.catalogue-heading .eyebrow,.catalogue-topline,.catalogue-categories button,.topic-group-heading > span,.chapter-description,.chapter-progress-label,.catalogue-bottom,.footnote,.topic-detail-stats > div > span,.topic-detail-stats > div > small,.topic-difficulty-copy p,.topic-difficulty-progress small,.mega-easy-choice) { color: var(--catalogue-muted); }
.practice-catalogue .catalogue-categories button[aria-pressed="true"] { color: #f8faf6; }
.practice-catalogue .topic-difficulty-section > .topic-group-heading :is(p,span) { color: var(--catalogue-muted); }

@media (min-width: 951px) {
  /* The persistent sidebar already offers all three practice sections. */
  .practice-catalogue .catalogue-tabs { display: none; }
  .practice-catalogue .catalogue-topline { border-top: 1px solid var(--catalogue-line); }
}

@media (min-width: 1680px) {
  .practice-catalogue .chapter-grid { grid-template-columns: repeat(4,minmax(0,1fr)); }
}
@media (max-width: 1180px) and (min-width: 951px) {
  .practice-catalogue .chapter-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .practice-catalogue .catalogue-tools { gap: 12px; }
  .practice-catalogue .catalogue-access { max-width: 90px; white-space: normal; }
  .practice-catalogue .mega-difficulty { flex-basis: 220px; }
  .practice-catalogue .topic-hero { padding: 26px; gap: 20px; grid-template-columns: 90px minmax(0,1fr) auto; }
  .practice-catalogue .topic-hero-art { width: 90px; height: 98px; }
  .practice-catalogue .topic-hero-art svg { width: 90px; height: 68px; }
}
@media (max-width: 950px) {
  .practice-catalogue .chapter-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .practice-catalogue .catalogue-heading h1 { font-size: 30px; }
}
@media (max-width: 700px) {
  .practice-catalogue .catalogue-heading { align-items: flex-start; margin-bottom: 18px; }
  .practice-catalogue .catalogue-heading h1 { font-size: 27px; line-height: 1.25; max-width: 18ch; }
  .practice-catalogue .catalogue-heading p { font-size: 12px; }
  .practice-catalogue .catalogue-heading > .btn { font-size: 0; padding: 10px; min-width: 39px; min-height: 39px; }
  .practice-catalogue .catalogue-heading > .btn svg { display: block; width: 17px; height: 17px; }
  .practice-catalogue .catalogue-tabs { gap: 0; width: 100%; }
  .practice-catalogue .catalogue-tabs button { flex: 1; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 3px; padding: 8px 4px; min-height: 55px; }
  .practice-catalogue .catalogue-tabs button:first-child { padding: 8px 4px; }
  .practice-catalogue .catalogue-tabs button strong { font-size: 12px; }
  .practice-catalogue .catalogue-tabs button span { display: block; font-size: 9px; }
  .practice-catalogue .catalogue-tabs button.active:first-child::after { left: 8px; }
  .practice-catalogue .catalogue-topline { font-size: 10px; margin-bottom: 14px; min-height: 44px; }
  .practice-catalogue .catalogue-topline > div > span { margin: 0 3px; }
  .practice-catalogue .catalogue-categories { gap: 4px; margin-bottom: 16px; }
  .practice-catalogue .catalogue-categories button { font-size: 10px; padding: 7px 9px; min-height: 33px; }
  .practice-catalogue .catalogue-tools { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 14px 10px; margin-bottom: 23px; }
  .practice-catalogue .catalogue-tools .search-box { min-width: 0; width: 100%; max-width: none; grid-column: 1; }
  .practice-catalogue .catalogue-access { max-width: 105px; white-space: normal; font-size: 10px; grid-column: 2; }
  .practice-catalogue .mega-difficulty { min-width: 0; max-width: none; width: 100%; grid-column: 1/-1; margin: 0; padding: 12px 14px 7px; background: #eef1e9; border-radius: 8px; }
  .practice-catalogue .mega-difficulty > label { font-size: 11px; }
  .practice-catalogue .mega-difficulty .text-link { font-size: 10px; }
  .practice-catalogue .mega-difficulty .mega-easy-choice { margin-left: auto; }
  .practice-catalogue .topic-group-heading { padding-bottom: 12px; }
  .practice-catalogue .topic-group-heading h2 { font-size: 17px; }
  .practice-catalogue .chapter-grid { gap: 13px; }
  .practice-catalogue .chapter-body { padding: 16px 15px 13px; }
  .practice-catalogue .chapter-art { min-height: 100px; padding: 10px 14px; }
  .practice-catalogue .chapter-art > svg { width: 96px; height: 72px; }
  .practice-catalogue .chapter-count { right: 11px; top: 11px; font-size: 9px; }
  .practice-catalogue .chapter-body h3 { font-size: 14px; }
  .practice-catalogue .chapter-description { font-size: 11px; }
  .practice-catalogue .chapter-actions { flex-wrap: wrap; }
  .practice-catalogue .chapter-actions .btn { padding: 8px 10px; }
  .practice-catalogue .catalogue-resume { align-items: flex-start; flex-direction: column; gap: 12px; padding: 16px; }
  .practice-catalogue .catalogue-bottom { gap: 12px; align-items: flex-start; }
  .practice-catalogue .topic-hero { grid-template-columns: 74px minmax(0,1fr); gap: 18px; padding: 23px 20px; }
  .practice-catalogue .topic-hero-art { width: 74px; height: 82px; border-radius: 9px; }
  .practice-catalogue .topic-hero-art svg { width: 78px; height: 59px; }
  .practice-catalogue .topic-hero-copy h1 { font-size: 24px; }
  .practice-catalogue .topic-hero-copy p { font-size: 11px; }
  .practice-catalogue .topic-hero-actions { grid-column: 1/-1; flex-direction: column; }
  .practice-catalogue .topic-detail-stats { padding: 20px 0; margin-bottom: 22px; }
  .practice-catalogue .topic-detail-stats > div { padding: 0 12px; }
  .practice-catalogue .topic-detail-stats strong { font-size: 20px; }
  .practice-catalogue .topic-detail-stats span,.practice-catalogue .topic-detail-stats small { font-size: 10px; }
  .practice-catalogue .topic-difficulty-section > header { align-items: flex-start; }
  .practice-catalogue .topic-difficulty-section h2 { font-size: 18px; }
  .practice-catalogue .topic-difficulty-row { display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 13px; padding: 18px; }
  .practice-catalogue .topic-difficulty-copy { grid-column: 1; }
  .practice-catalogue .topic-difficulty-progress { grid-column: 1; grid-row: 2; width: 100%; max-width: 210px; }
  .practice-catalogue .topic-difficulty-row > .btn { grid-column: 2; grid-row: 1/3; min-width: 94px; min-height: 40px; }
  .practice-catalogue .topic-format-note { padding: 16px; }
}
@media (max-width: 520px) {
  .practice-catalogue .catalogue-heading { align-items: center; margin-bottom: 18px; }
  .practice-catalogue .catalogue-heading :is(.eyebrow,p) { display: none; }
  .practice-catalogue .catalogue-heading h1 { font-size: 25px; max-width: 20ch; }
  .practice-catalogue .catalogue-topline { display: flex; flex-direction: row; align-items: center; gap: 10px; }
  .practice-catalogue .catalogue-topline > div { flex: 1; }
  .practice-catalogue .catalogue-categories { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; padding: 1px 0 4px; margin-bottom: 15px; }
  .practice-catalogue .catalogue-categories::-webkit-scrollbar { display: none; }
  .practice-catalogue .catalogue-categories button { flex: 0 0 auto; }
  .practice-catalogue .mega-difficulty { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: center; gap: 0 10px; padding: 10px 12px; }
  .practice-catalogue .mega-difficulty > label { grid-column: 1/-1; margin-bottom: 4px; }
  .practice-catalogue .mega-difficulty > .mega-range { display: none; }
  .practice-catalogue .mega-difficulty > div:not(.mega-range) { gap: 8px; }
  .practice-catalogue .mega-difficulty .text-link { min-height: 34px; }
  .practice-catalogue .mega-difficulty .mega-easy-choice { margin: 0; padding-left: 10px; border-left: 1px solid #dce3d5; white-space: nowrap; }
  .practice-catalogue .mega-difficulty:has(.small-copy) { display: block; }
  .practice-catalogue .mega-difficulty .small-copy { display: none; }
  .practice-catalogue .chapter-grid { grid-template-columns: minmax(0,1fr); }
  .practice-catalogue .chapter-art { min-height: 100px; }
  .practice-catalogue .chapter-body { padding: 18px; }
  .practice-catalogue .chapter-body h3 { font-size: 16px; }
  .practice-catalogue .chapter-description { min-height: 0; font-size: 12px; }
  .practice-catalogue .chapter-count { font-size: 10px; }
  .practice-catalogue .chapter-meta { font-size: 11px; }
  .practice-catalogue .chapter-progress-label { font-size: 10px; }
  .practice-catalogue .chapter-explore { font-size: 11px; }
  .practice-catalogue .chapter-actions .btn { min-height: 40px; padding: 9px 14px; font-size: 12px; }
  .practice-catalogue .catalogue-topline > div { display: block; }
  .practice-catalogue .catalogue-topline > span { font-size: 9px; }
  .practice-catalogue .catalogue-bottom { flex-direction: column; }
  .practice-catalogue .topic-hero { gap: 14px; padding: 20px 17px; }
  .practice-catalogue .topic-hero-copy h1 { font-size: 22px; }
  .practice-catalogue .topic-hero-copy .eyebrow { font-size: 9px; }
  .practice-catalogue .topic-detail-stats { grid-template-columns: 1fr; gap: 14px; padding: 20px 0; }
  .practice-catalogue .topic-detail-stats > div { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: baseline; gap: 0 15px; padding: 0; border: 0; }
  .practice-catalogue .topic-detail-stats > div > small { grid-column: 1/-1; margin-top: 0; }
  .practice-catalogue .topic-detail-stats strong { font-size: 20px; }
  .practice-catalogue .topic-detail-stats span { text-align: left; }
}
@media (prefers-reduced-motion: reduce) {
  .practice-catalogue * { scroll-behavior: auto !important; transition-duration: 0s !important; }
  .practice-catalogue .chapter-card:hover { transform: none; }
}