.ka-preview-note {
  max-width: 1150px;
  margin: 20px auto 0;
  padding: 14px 18px;
  background: #fff6df;
  border: 1px solid #e4c879;
  border-radius: 10px;
  line-height: 1.65;
  font-size: 12px;
  color: #5b461d;
}
.ka-preview-note strong { display: block; margin-bottom: 3px; color: #6c4d0c; }
.ka-preview-note p { margin: 0 0 5px; }
.ka-preview-note a { color: #8a5b17; text-decoration: underline; text-underline-offset: 3px; }

.ka-stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding: 14px 0; }
.ka-stat-grid > div { border: 1px solid #e3edf3; border-radius: 6px; padding: 10px 12px; background: #fbfdfe; }
.ka-stat-grid b { display: block; font: 700 26px Georgia, serif; color: #3485b7; line-height: 1.1; }
.ka-stat-grid span { color: #648095; font-size: 10.5px; }

.ka-modules { padding-top: 44px; padding-bottom: 30px; }
.ka-module-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.ka-module-card {
  border: 1px solid #d7e6ee; border-radius: 8px; background: #fff; padding: 17px 18px;
  display: flex; flex-direction: column; gap: 8px; min-height: 220px;
}
.ka-module-card header { display: flex; align-items: baseline; gap: 9px; }
.ka-module-card header b { font: 700 24px Georgia, serif; color: #3485b7; }
.ka-module-card h3 { font-size: 19px; }
.ka-module-card p { color: #4f6d82; font-size: 11.5px; line-height: 1.6; flex: 1; }
.ka-module-card .ka-module-meta { color: #648095; font-size: 10px; }
.ka-module-card .ka-module-actions { display: flex; gap: 7px; flex-wrap: wrap; }
.ka-module-card .ka-progress-mini { height: 5px; background: #eef4f8; border-radius: 99px; overflow: hidden; }
.ka-module-card .ka-progress-mini i { display: block; height: 100%; background: #3485b7; width: 0; }
.ka-module-card.ready { border-color: #b7d8e8; }

.ka-progress-actions { display: flex; gap: 14px; align-items: center; }
.ka-toolbar { display: flex; gap: 9px; align-items: center; flex-wrap: wrap; margin-top: 13px; }
.ka-search { position: relative; display: flex; align-items: center; flex: 1 1 260px; min-width: 190px; }
.ka-search input { width: 100%; padding: 8px 30px 8px 11px; border: 1px solid #d2e3ec; border-radius: 5px; background: #fff; color: #17384f; font: inherit; font-size: 12px; }
.ka-search button { position: absolute; right: 5px; border: 0; background: transparent; color: #648095; font-size: 17px; cursor: pointer; }
.ka-filter { display: flex; align-items: center; gap: 6px; color: #648095; font-size: 10.5px; }
.ka-filter select { border: 1px solid #d2e3ec; border-radius: 5px; background: #fff; color: #17384f; padding: 7px 9px; font: inherit; font-size: 11px; }
.ka-quiet { color: #648095; font-size: 10.5px; }
.ka-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.ka-lesson-nav-head p:last-child { color: #648095; font-size: 10px; margin-top: 3px; }
.ka-lesson-nav-group { margin-top: 14px; }
.ka-lesson-nav-group > b { display: block; color: #648095; font-size: 10px; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 5px; }
.ka-lesson-nav-group button { display: grid; grid-template-columns: 34px minmax(0, 1fr) 14px; align-items: start; gap: 6px; width: 100%; min-width: 0; overflow: hidden; border: 0; border-top: 1px solid #e7eff4; background: transparent; text-align: left; padding: 8px 0; color: #3d5f75; font-size: 11px; line-height: 1.45; cursor: pointer; }
.ka-lesson-nav-group button > span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ka-lesson-nav-group button::before { content: none !important; display: none !important; }
.ka-lesson-nav-group button:hover { color: #3485b7; }
.ka-lesson-nav-group button[aria-current="true"] { color: #3485b7; font-weight: 700; }
.ka-lesson-nav-group button.done::after { content: none !important; }
.ka-lesson-nav-group button .nav-id { color: #9aafbd; font-family: Georgia, serif; font-size: 11px; }

.ka-lesson-head { display: flex; justify-content: space-between; gap: 18px; align-items: flex-start; padding-bottom: 14px; border-bottom: 1px solid #edf3f7; }
.ka-lesson-head .ka-eyebrow { color: #3485b7; font-size: 10px; letter-spacing: .12em; text-transform: uppercase; font-weight: 700; }
.ka-lesson-head h2 { font-size: 30px; line-height: 1.2; letter-spacing: -.5px; margin-top: 5px; }
.ka-lesson-head .ka-goal { color: #648095; font-size: 12px; line-height: 1.65; margin-top: 7px; max-width: 720px; }
.ka-lesson-meta { text-align: right; color: #648095; font-size: 10px; flex-shrink: 0; }
.ka-lesson-meta b { display: block; font: 400 20px Georgia, serif; color: #17384f; }
.ka-prereq { display: flex; gap: 5px; flex-wrap: wrap; margin-top: 10px; }
.ka-prereq a { color: #3485b7; font-size: 10px; border: 1px solid #d7e6ee; border-radius: 99px; padding: 3px 8px; text-decoration: none; }
.ka-prereq a:hover { border-color: #9dc4d9; }
.ka-lesson-body { padding-top: 16px; }
.ka-intro { color: #31536a; font-size: 13px; line-height: 1.8; }
.ka-observe { margin: 18px 0; border: 1px solid #dce9f1; border-radius: 6px; background: #f8fbfd; padding: 14px 16px; }
.ka-observe h3 { font-size: 13px; margin-bottom: 8px; }
.ka-observe ol { margin: 0; padding-left: 20px; display: grid; gap: 6px; }
.ka-observe li { color: #31536a; font-size: 11.5px; line-height: 1.6; }
.ka-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 18px 0; }
.ka-compare-card { border: 1px solid #e3edf3; border-radius: 6px; background: #fff; padding: 10px; min-width: 0; overflow: hidden; }
.ka-lesson, .ka-lesson-body, .ka-exercise-box, .ka-case-player, .ka-lesson-layout > * { min-width: 0; }
.ka-chart-wrap { width: 100%; max-width: 100%; }
.ka-compare-card header { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; margin-bottom: 5px; }
.ka-compare-card header b { font-size: 11px; }
.ka-compare-card header span { color: #648095; font-size: 9.5px; }
.ka-compare-card p { color: #648095; font-size: 10.5px; line-height: 1.5; margin-top: 6px; }
.ka-chart-wrap { overflow-x: auto; overflow-y: hidden; border: 1px solid #e9f1f5; border-radius: 4px; background: #fbfdfe; }
.ka-chart-wrap svg { display: block; width: 100%; min-width: 0; height: auto; }
.ka-chart-readout { display: flex; justify-content: space-between; gap: 8px; padding: 4px 7px; border-bottom: 1px solid #edf3f7; color: #648095; font-size: 9.5px; }
.ka-chart-readout b { color: #17384f; font-size: 9.5px; }
.ka-case-controls { display: flex; gap: 7px; flex-wrap: wrap; align-items: center; margin-top: 8px; }
.ka-case-controls .ka-quiet { font-size: 9.5px; }
.ka-evidence { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 9px; margin: 16px 0; }
.ka-evidence > div { border-left: 3px solid #3485b7; background: #f8fbfd; padding: 9px 11px; }
.ka-evidence h3 { font-size: 11px; margin-bottom: 4px; }
.ka-evidence p { color: #4f6d82; font-size: 10.5px; line-height: 1.55; }
.ka-evidence .ka-invalidation { border-left-color: #b04554; }
.ka-evidence .ka-competing { border-left-color: #d4a95f; }
.ka-exercise-box { border: 1px solid #dce9f1; border-radius: 6px; background: #f8fbfd; padding: 14px 15px; margin-top: 18px; }
.ka-exercise-box > h3 { font-size: 13px; margin-bottom: 4px; }
.ka-exercise-box > p { color: #648095; font-size: 10.5px; line-height: 1.55; margin-bottom: 9px; }
.ka-case-player { border: 1px solid #e3edf3; border-radius: 5px; background: #fff; padding: 9px; }
.ka-case-player .ka-judgment { margin-top: 9px; border-top: 1px dashed #dce8ef; padding-top: 8px; }
.ka-judgment p { font-size: 11px; color: #31536a; margin-bottom: 6px; }
.ka-judgment-options { display: grid; gap: 4px; }
.ka-judgment-options label { display: flex; gap: 7px; align-items: flex-start; border: 1px solid #e5eef4; border-radius: 4px; padding: 6px 8px; font-size: 10.5px; line-height: 1.45; cursor: pointer; }
.ka-judgment-options input { margin-top: 2px; accent-color: #3485b7; }
.ka-judgment-options label.correct { border-color: #b7ddcf; background: #f0faf6; }
.ka-judgment-options label.wrong { border-color: #ecc9ce; background: #fff5f6; }
.ka-lesson-foot { display: flex; justify-content: space-between; gap: 10px; align-items: center; flex-wrap: wrap; margin-top: 20px; padding-top: 14px; border-top: 1px solid #edf3f7; }
.ka-lesson-foot > div { display: flex; gap: 7px; flex-wrap: wrap; }
.ka-source-list { margin-top: 14px; border-top: 1px solid #edf3f7; padding-top: 9px; }
.ka-source-list h3 { font-size: 11px; margin-bottom: 4px; }
.ka-source-list p { color: #648095; font-size: 9.5px; line-height: 1.5; margin-bottom: 4px; }
.ka-source-list a { color: #3485b7; }
.ka-term-link { color: #3485b7; border-bottom: 1px dotted #3485b7; cursor: pointer; }

.ka-case-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.ka-case-card { border: 1px solid #d7e6ee; border-radius: 7px; background: #fff; padding: 13px 14px; text-align: left; cursor: pointer; display: flex; flex-direction: column; gap: 5px; min-height: 150px; }
.ka-case-card:hover, .ka-case-card[aria-current="true"] { border-color: #3485b7; background: #fbfdff; }
.ka-case-card b { font-size: 13px; line-height: 1.35; }
.ka-case-card small { color: #648095; font-size: 9.5px; }
.ka-case-card p { color: #4f6d82; font-size: 10.5px; line-height: 1.5; flex: 1; }
.ka-case-card .ka-tag { display: inline-block; align-self: flex-start; background: #edf6fb; color: #2d78a2; border-radius: 99px; padding: 2px 7px; font-size: 9px; }
.ka-case-detail { margin-top: 16px; }
.ka-case-detail:empty { display: none; }
.ka-case-detail-inner { border: 1px solid #d7e6ee; border-radius: 7px; background: #fff; padding: 15px; }
.ka-case-detail-inner > header { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; margin-bottom: 8px; }
.ka-case-detail-inner h3 { font-size: 20px; }
.ka-case-detail-inner header p { color: #648095; font-size: 10px; }
.ka-case-detail-inner > p { color: #4f6d82; font-size: 11px; line-height: 1.6; }
.ka-event-list { margin-top: 9px; display: grid; gap: 4px; }
.ka-event { border-left: 3px solid #3485b7; background: #f8fbfd; padding: 6px 9px; font-size: 10px; color: #31536a; line-height: 1.5; }
.ka-event b { color: #17384f; }
.ka-case-tabs { display: flex; gap: 5px; margin-bottom: 8px; }
.ka-case-tabs button { border: 1px solid #d7e6ee; background: #fff; color: #4f6d82; border-radius: 4px; padding: 5px 9px; font-size: 10px; cursor: pointer; }
.ka-case-tabs button[aria-pressed="true"] { background: #3485b7; border-color: #3485b7; color: #fff; }

.ka-quiz-toolbar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 10px; }
.ka-q { background: #fff; border: 1px solid #d7e6ee; border-radius: 6px; padding: 14px 16px; margin-bottom: 10px; }
.ka-q legend { font-size: 12.5px; font-weight: 700; line-height: 1.5; padding: 0; margin-bottom: 8px; }
.ka-q fieldset { border: 0; padding: 0; margin: 0; }
.ka-q .ka-q-meta { color: #648095; font-size: 9.5px; margin-bottom: 7px; }
.ka-options { display: grid; gap: 5px; }
.ka-option { display: flex; gap: 8px; align-items: flex-start; border: 1px solid #e4edf3; border-radius: 4px; padding: 7px 9px; font-size: 11px; line-height: 1.5; cursor: pointer; }
.ka-option input[type="radio"] { width: 15px; height: 15px; min-width: 15px; padding: 0; margin: 2px 0 0; accent-color: #3485b7; }
.ka-option.correct { border-color: #b7ddcf; background: #f0faf6; }
.ka-option.wrong { border-color: #ecc9ce; background: #fff5f6; }
.ka-q-actions { display: flex; gap: 8px; align-items: center; margin-top: 8px; flex-wrap: wrap; }
.ka-q-feedback { margin-top: 8px; border-top: 1px dashed #dce8ef; padding-top: 7px; font-size: 10.5px; line-height: 1.6; color: #31536a; }
.ka-q-feedback b { color: #17384f; }
.ka-q-feedback ul { list-style: none; padding: 0; margin: 6px 0 0; display: grid; gap: 3px; }
.ka-q-feedback li { color: #648095; }
.ka-q-feedback li.ok { color: #1d7a61; }
.ka-q-feedback li.bad { color: #b04554; }
.ka-quiz-result { margin-top: 12px; padding: 11px 14px; border-radius: 5px; background: #edf6fb; color: #31536a; font-size: 11.5px; line-height: 1.55; }
.ka-quiz-result b { color: #3485b7; }

.ka-modal { position: fixed; inset: 0; z-index: 80; background: #17384f66; display: grid; place-items: center; padding: 16px; }
.ka-modal[hidden] { display: none; }
.ka-modal-inner { width: min(760px, 100%); max-height: 86vh; overflow: auto; background: #f8fcff; border-radius: 8px; border: 1px solid #d7e6ee; padding: 18px; box-shadow: 0 22px 60px #17384f33; }
.ka-modal-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; margin-bottom: 10px; }
.ka-modal-head h2 { font-size: 22px; }
.ka-glossary-list { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }
.ka-glossary-item { border: 1px solid #e3edf3; border-radius: 5px; background: #fff; padding: 10px 12px; }
.ka-glossary-item b { font-size: 12px; color: #17384f; }
.ka-glossary-item small { color: #3485b7; font-size: 9.5px; margin-left: 5px; }
.ka-glossary-item p { color: #4f6d82; font-size: 10.5px; line-height: 1.5; margin-top: 4px; }
.ka-glossary-item a { color: #3485b7; font-size: 9.5px; }
.ka-wrong-item { border: 1px solid #e3edf3; border-radius: 5px; background: #fff; padding: 9px 11px; margin-bottom: 6px; font-size: 10.5px; line-height: 1.5; }
.ka-wrong-item b { color: #b04554; }
.ka-wrong-item button { margin-top: 5px; }

.ka-demo-chart svg { display: block; width: 100%; height: auto; }
.ka-demo-ledger table { width: 100%; border-collapse: collapse; font-size: 10.5px; }
.ka-demo-ledger th, .ka-demo-ledger td { text-align: left; padding: 5px 6px; border-bottom: 1px solid #eef4f8; }
.ka-demo-ledger th { color: #648095; font-weight: 600; }
.ka-demo-ledger .net { color: #1d7a61; font-weight: 700; }

@media (max-width: 1100px) {
  .ka-module-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ka-case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ka-evidence { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .ka-compare { grid-template-columns: 1fr; }
  .ka-lesson-head h2 { font-size: 26px; }
  .ka-glossary-list { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .ka-module-grid, .ka-case-grid { grid-template-columns: 1fr; }
  .ka-evidence { grid-template-columns: 1fr; }
  .ka-toolbar, .ka-quiz-toolbar { align-items: stretch; }
  .ka-search { flex: 1 1 100%; }
  .ka-lesson-head { flex-direction: column; gap: 7px; }
  .ka-lesson-head h2 { font-size: 24px; }
  .ka-lesson-meta { text-align: left; }
  .ka-chart-wrap svg { min-width: 0; }
  .ka-q { padding: 12px; }
  .ka-option { font-size: 12px; }
  .ka-modal-inner { padding: 14px; }
  .ka-lesson-nav-group button { grid-template-columns: 30px minmax(0, 1fr) 12px; font-size: 11px; }
  .ka-stat-grid b { font-size: 23px; }
}
@media (max-width: 390px) {
  .ka-hero h1 { font-size: 38px; }
  .ka-preview-note { margin-left: 14px; margin-right: 14px; }
  .ka-chart-wrap svg { min-width: 0; }
  .ka-compare-card { padding: 8px; }
  .ka-lesson-foot > div { display: grid; grid-template-columns: 1fr 1fr; }
  .ka-demo-actions { display: grid; grid-template-columns: 1fr 1fr; }
}

/* V2 independent audit corrections: a reading page first, with chart-sized exercises. */
html { scroll-behavior: auto; }
.ka-lesson-body { font-size: 16px; line-height: 1.8; }
.ka-intro, .ka-observe li, .ka-evidence p, .ka-compare-card p, .ka-q legend,
.ka-option, .ka-q-feedback, .ka-q-feedback li, .ka-judgment, .ka-judgment-options label,
.ka-checklist li, .ka-event, .ka-demo-step p, .ka-glossary-item p, .ka-wrong-item,
.ka-goal, .ka-lesson-head .ka-goal { font-size: 16px; line-height: 1.75; }
.ka-quiet, .ka-source-list p, .ka-chart-note, .ka-chart-readout, .ka-q-meta,
.ka-glossary-item small, .ka-lesson-meta, .ka-preview-note, .ka-note { font-size: 14px; line-height: 1.65; }
.ka-button, .ka-text-button, .ka-case-tabs button, .ka-lesson-nav-group button { min-height: 44px; font-size: 15px; }
.ka-observe h3, .ka-evidence h3, .ka-section-sub, .ka-exercise-box h3, .ka-lab h3 { font-size: 19px; line-height: 1.5; }
.ka-lesson-layout { grid-template-columns: 240px minmax(0,1fr); align-items: start; }
.ka-lesson-nav summary { padding: 12px 0; font-size: 16px; cursor: pointer; font-weight: 700; }
.ka-lesson-nav-group button { grid-template-columns: 36px minmax(0,1fr) 14px; }
.ka-lesson-nav-group button > span { white-space: normal; overflow: visible; }
.ka-lesson-nav-group button .nav-id { font-size: 14px; }
.ka-lesson, .ka-case-detail-inner, .ka-demo-chart, .ka-demo-panel { min-width: 0; }
#ka-lesson-panel { scroll-margin-top: 105px; }
.ka-chart-wrap { overflow: hidden; }
.ka-chart-scroll { width: 100%; min-width: 0; overflow-x: auto; overscroll-behavior-x: contain; border-block: 1px solid #e4edf3; }
.ka-chart-scroll svg { width: 100%; min-width: 680px; max-width: none; height: auto; }
.ka-chart-scroll svg text { font-size: 15px; }
.ka-chart-note { display: block; padding: 8px 10px; }
.ka-chart-readout { gap: 8px; flex-wrap: wrap; padding: 8px 10px; }
.ka-lab { border-top: 3px solid #3485b7; background: #f6faff; padding: 18px; margin: 24px 0; min-width: 0; }
.ka-lab > * + * { margin-top: 14px; }
.ka-lab-fields { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; }
.ka-lab label, .ka-observation-fields label { display: grid; gap: 6px; font-size: 15px; min-width: 0; }
.ka-lab input, .ka-lab select, .ka-observation-fields textarea { width: 100%; min-width: 0; border: 1px solid #a9c7dc; border-radius: 6px; background: white; padding: 10px; font-size: 16px; color: #17384f; min-height: 44px; }
.ka-observation-fields { display: grid; gap: 12px; margin: 16px 0; }
.ka-lab output { display: block; border-left: 3px solid #3485b7; padding: 10px 14px; background: #eaf3fa; overflow-wrap: anywhere; }
.ka-lab table, #ka-demo-ledger table { width: 100%; border-collapse: collapse; font-size: 14px; }
.ka-lab th, .ka-lab td, #ka-demo-ledger th, #ka-demo-ledger td { padding: 8px 5px; border-bottom: 1px solid #d7e6ee; text-align: left; overflow-wrap: anywhere; }
.ka-bar-picker { display: flex; flex-wrap: wrap; gap: 6px; }
.ka-bar-picker button { min-height: 44px; padding: 8px; border: 1px solid #a9c7dc; border-radius: 6px; background: white; }
.ka-background-pair { margin-block: 24px; min-width: 0; }
.ka-compare > * { min-width: 0; }
.ka-search input, .ka-filter select { min-height: 44px; font-size: 16px; }
.ka-glossary-item b, .ka-glossary-item a { font-size: 16px; }
@media (max-width: 1100px) { .ka-compare { grid-template-columns: minmax(0,1fr); } }
@media (max-width: 850px) { #nav.open { display: flex; } .menu-toggle { min-height: 44px; } }
@media (max-width: 800px) {
  .ka-lesson-layout { display: block; }
  .ka-lesson-nav { position: static; max-height: none; margin-bottom: 20px; }
  .ka-lesson-nav[open] #ka-lesson-nav { max-height: 50dvh; overflow-y: auto; }
  .ka-lesson { padding: 18px 14px; }
  .ka-exercise-box, .ka-lab { padding: 14px 10px; }
  .ka-case-player { min-width: 0; }
  .ka-source-list a { overflow-wrap: anywhere; }
  .ka-evidence { grid-template-columns: minmax(0,1fr) !important; }
}
@media (max-width: 390px) {
  .wrap { padding-inline: 14px; }
  .ka-lab-fields { grid-template-columns: minmax(0,1fr); }
  .ka-lesson-foot, .ka-lesson-foot > div { display: flex; flex-wrap: wrap; }
}

.ka-background-pair .ka-compare { grid-template-columns: repeat(2,minmax(0,1fr)); }
.ka-background-pair .ka-compare > div { min-width: 0; }
@media(max-width:1100px) { .ka-background-pair .ka-compare { grid-template-columns:minmax(0,1fr); } }