.gnau-lesson,
.gnau-update-center,
.gnau-course-info,
.gnau-message {
  --gnau-primary: #153f66;
  --gnau-accent: #2aaacb;
  --gnau-ink: #172638;
  --gnau-muted: #607286;
  --gnau-line: #dce5ec;
  --gnau-surface: #f4f8fb;
  box-sizing: border-box;
  color: var(--gnau-ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

.gnau-lesson *,
.gnau-update-center *,
.gnau-course-info * { box-sizing: border-box; }

.gnau-lesson {
  background: #fff;
  border: 1px solid var(--gnau-line);
  border-radius: 22px;
  box-shadow: 0 18px 48px rgba(22, 54, 78, .10);
  margin: 18px auto;
  max-width: 980px;
  overflow: hidden;
}

.gnau-progress {
  background: #fff;
  border-bottom: 1px solid var(--gnau-line);
  padding: 12px clamp(20px, 4vw, 44px);
  position: sticky;
  top: 0;
  z-index: 4;
}

.gnau-progress__meta {
  align-items: center;
  display: flex;
  font-size: 12px;
  justify-content: space-between;
  letter-spacing: .04em;
  margin-bottom: 6px;
  text-transform: uppercase;
}

.gnau-progress__track {
  background: #e9f0f5;
  border-radius: 20px;
  height: 6px;
  overflow: hidden;
}

.gnau-progress__track span {
  background: linear-gradient(90deg, var(--gnau-primary), var(--gnau-accent));
  display: block;
  height: 100%;
  transition: width .3s ease;
  width: 0;
}

.gnau-lesson__header,
.gnau-update-center__hero {
  align-items: flex-start;
  background:
    radial-gradient(circle at 90% 8%, rgba(42, 170, 203, .22), transparent 30%),
    linear-gradient(135deg, var(--gnau-primary), #0f2d49);
  color: #fff;
  display: flex;
  gap: 30px;
  justify-content: space-between;
  padding: clamp(34px, 7vw, 72px) clamp(22px, 6vw, 64px);
}

.gnau-lesson h1,
.gnau-update-center h1 {
  color: inherit;
  font-size: clamp(29px, 5vw, 48px);
  letter-spacing: -.035em;
  line-height: 1.08;
  margin: 5px 0 14px;
  max-width: 740px;
}

.gnau-lesson h2,
.gnau-update-center h2,
.gnau-course-info h2 {
  color: var(--gnau-primary);
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -.02em;
  line-height: 1.25;
  margin: 0 0 14px;
}

.gnau-lesson h3 { color: var(--gnau-ink); font-size: 18px; line-height: 1.35; margin: 0 0 8px; }
.gnau-lesson p { margin: 0 0 14px; }
.gnau-lead { font-size: 19px; opacity: .94; }
.gnau-eyebrow { font-size: 12px; font-weight: 800; letter-spacing: .13em; margin: 0 !important; text-transform: uppercase; }

.gnau-version-badge {
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 14px;
  flex: 0 0 auto;
  min-width: 126px;
  padding: 12px 15px;
}
.gnau-version-badge span { display: block; font-size: 10px; letter-spacing: .08em; opacity: .8; text-transform: uppercase; }
.gnau-version-badge strong { display: block; font-size: 20px; margin-top: 2px; }

.gnau-lesson__blocks { padding: clamp(24px, 5vw, 56px); }
.gnau-block { margin: 0 0 clamp(34px, 6vw, 64px); }
.gnau-block:last-child { margin-bottom: 0; }
.gnau-richtext > *:last-child { margin-bottom: 0; }
.gnau-richtext a, .gnau-references a { color: var(--gnau-primary); font-weight: 650; text-underline-offset: 3px; }

.gnau-block--hero {
  background: linear-gradient(135deg, #f3f9fc, #edf4f8);
  border-left: 5px solid var(--gnau-accent);
  border-radius: 0 18px 18px 0;
  padding: clamp(22px, 4vw, 36px);
}

.gnau-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.gnau-chip {
  background: var(--gnau-primary);
  border-radius: 999px;
  color: #fff;
  display: inline-block;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: .02em;
  padding: 5px 11px;
}
.gnau-chip--soft { background: #e7f2f6; color: var(--gnau-primary); }

.gnau-objectives,
.gnau-takeaways {
  background: #fff;
  border: 1px solid var(--gnau-line);
  border-radius: 18px;
  padding: clamp(22px, 4vw, 36px);
}
.gnau-objectives ul, .gnau-takeaways ul { list-style: none; margin: 0; padding: 0; }
.gnau-objectives li, .gnau-takeaways li { border-top: 1px solid var(--gnau-line); padding: 13px 0 13px 32px; position: relative; }
.gnau-objectives li:first-child, .gnau-takeaways li:first-child { border-top: 0; }
.gnau-objectives li::before, .gnau-takeaways li::before { color: var(--gnau-accent); content: "✓"; font-size: 18px; font-weight: 900; left: 2px; position: absolute; top: 10px; }

.gnau-notice { border: 1px solid #b7ddec; border-radius: 16px; background: #eef9fd; padding: 22px 24px; }
.gnau-notice h2 { font-size: 19px; margin-bottom: 7px; }
.gnau-notice--warning { background: #fff8e5; border-color: #f0d797; }
.gnau-notice--danger { background: #fff0f0; border-color: #efb7b7; }
.gnau-notice--success { background: #edf9f3; border-color: #acdcca; }

.gnau-case {
  background: #172638;
  border-radius: 20px;
  color: #f6fbff;
  overflow: hidden;
  padding: clamp(24px, 5vw, 44px);
}
.gnau-case h2 { color: #fff; }
.gnau-case__heading > span { color: #78d5eb; font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.gnau-facts { display: grid; gap: 10px; grid-template-columns: repeat(3, 1fr); margin: 24px 0; }
.gnau-facts div { background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14); border-radius: 12px; padding: 13px; }
.gnau-facts dt { color: #a8bed0; font-size: 11px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.gnau-facts dd { font-size: 16px; font-weight: 700; margin: 3px 0 0; }
.gnau-case__prompt { border-top: 1px solid rgba(255,255,255,.18); font-weight: 700; margin: 24px 0 0 !important; padding-top: 20px; }

.gnau-decision { background: #f7fafc; border: 1px solid var(--gnau-line); border-radius: 20px; padding: clamp(24px, 5vw, 42px); }
.gnau-decision .gnau-eyebrow { color: var(--gnau-accent); }
.gnau-decision__choices { display: grid; gap: 10px; margin-top: 20px; }
.gnau-decision__choices button,
.gnau-review-button {
  appearance: none;
  background: #fff;
  border: 1px solid #cbd9e2;
  border-radius: 12px;
  color: var(--gnau-ink);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 14px 16px;
  text-align: left;
  transition: border-color .15s, box-shadow .15s, transform .15s;
}
.gnau-decision__choices button:hover { border-color: var(--gnau-accent); box-shadow: 0 6px 18px rgba(21,63,102,.08); transform: translateY(-1px); }
.gnau-decision__choices button.is-selected { border-color: var(--gnau-primary); box-shadow: 0 0 0 2px rgba(21,63,102,.12); }
.gnau-decision__choices button.is-correct { background: #edf9f3; border-color: #55ae87; }
.gnau-decision__choices button.is-incorrect { background: #fff3f3; border-color: #d98383; }
.gnau-decision__feedback { background: #fff; border-left: 4px solid var(--gnau-accent); border-radius: 0 12px 12px 0; margin-top: 16px; padding: 16px 18px; }
.gnau-decision__fallback { border-top: 1px solid var(--gnau-line); margin-top: 18px; padding-top: 15px; }
.gnau-decision__fallback summary { cursor: pointer; font-weight: 750; }
.gnau-fallback-choice { border-top: 1px solid var(--gnau-line); margin-top: 13px; padding-top: 13px; }

.gnau-comparison__grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.gnau-comparison article { border: 1px solid var(--gnau-line); border-radius: 16px; padding: 22px; }
.gnau-comparison article:first-child { border-top: 4px solid var(--gnau-accent); }
.gnau-comparison ul { margin: 12px 0 0; padding-left: 20px; }

.gnau-algorithm ol { counter-reset: gnau-step; list-style: none; margin: 0; padding: 0; }
.gnau-algorithm li { align-items: flex-start; counter-increment: gnau-step; display: flex; gap: 18px; padding: 0 0 26px; position: relative; }
.gnau-algorithm li:not(:last-child)::after { background: var(--gnau-line); content: ""; height: calc(100% - 42px); left: 20px; position: absolute; top: 42px; width: 2px; }
.gnau-algorithm__number { align-items: center; background: var(--gnau-primary); border-radius: 50%; color: #fff; display: flex; flex: 0 0 42px; height: 42px; justify-content: center; position: relative; z-index: 1; }
.gnau-algorithm__number::before { content: counter(gnau-step); font-weight: 800; }

.gnau-table-scroll { border: 1px solid var(--gnau-line); border-radius: 14px; overflow-x: auto; }
.gnau-table-block table { border-collapse: collapse; margin: 0; min-width: 620px; width: 100%; }
.gnau-table-block th { background: var(--gnau-primary); color: #fff; font-size: 13px; letter-spacing: .02em; padding: 13px 15px; text-align: left; }
.gnau-table-block td { border-top: 1px solid var(--gnau-line); padding: 13px 15px; vertical-align: top; }
.gnau-table-block tr:nth-child(even) td { background: #f7fafc; }

.gnau-checklist { background: #f4f8fb; border-radius: 18px; padding: clamp(22px, 4vw, 34px); }
.gnau-checklist__items { display: grid; gap: 9px; }
.gnau-checklist label { align-items: flex-start; background: #fff; border: 1px solid var(--gnau-line); border-radius: 11px; cursor: pointer; display: flex; gap: 11px; padding: 13px; }
.gnau-checklist input { accent-color: var(--gnau-primary); height: 19px; margin-top: 3px; width: 19px; }
.gnau-checklist label:has(input:checked) { background: #edf8f4; border-color: #9fd4bf; }

.gnau-accordion details { border: 1px solid var(--gnau-line); border-radius: 12px; margin-bottom: 9px; overflow: hidden; }
.gnau-accordion summary { cursor: pointer; font-weight: 750; padding: 15px 18px; }
.gnau-accordion details > div { border-top: 1px solid var(--gnau-line); padding: 16px 18px; }

.gnau-references { border-top: 1px solid var(--gnau-line); padding-top: 30px; }
.gnau-references h2 { font-size: 21px; }
.gnau-references li { margin-bottom: 10px; padding-left: 5px; }

.gnau-lesson__footer { background: #f4f8fb; border-top: 1px solid var(--gnau-line); color: var(--gnau-muted); display: flex; flex-wrap: wrap; font-size: 12px; gap: 10px 24px; justify-content: space-between; padding: 16px clamp(22px, 6vw, 64px); }

.gnau-update-center { background: #fff; border: 1px solid var(--gnau-line); border-radius: 22px; box-shadow: 0 18px 48px rgba(22,54,78,.1); margin: 18px auto; max-width: 980px; overflow: hidden; }
.gnau-update-center__hero h1 { margin-bottom: 5px; }
.gnau-update-center__hero p { margin: 0; }
.gnau-timeline { padding: clamp(28px, 6vw, 60px); }
.gnau-timeline__item { display: grid; gap: 18px; grid-template-columns: 18px 1fr; position: relative; }
.gnau-timeline__item:not(:last-child)::before { background: var(--gnau-line); content: ""; height: 100%; left: 8px; position: absolute; top: 14px; width: 2px; }
.gnau-timeline__marker { background: #fff; border: 3px solid #a8b9c5; border-radius: 50%; height: 18px; margin-top: 18px; position: relative; width: 18px; z-index: 1; }
.gnau-timeline__item.is-current .gnau-timeline__marker { background: var(--gnau-accent); border-color: var(--gnau-primary); }
.gnau-timeline__card { border: 1px solid var(--gnau-line); border-radius: 17px; margin-bottom: 24px; padding: clamp(20px, 4vw, 32px); }
.gnau-timeline__item.is-current .gnau-timeline__card { box-shadow: 0 10px 30px rgba(21,63,102,.09); border-color: #b7cfdd; }
.gnau-timeline__top, .gnau-timeline__footer { align-items: center; display: flex; flex-wrap: wrap; gap: 10px 18px; justify-content: space-between; }
.gnau-timeline__top { color: var(--gnau-muted); font-size: 13px; margin-bottom: 18px; }
.gnau-change-list { list-style: none; margin: 18px 0; padding: 0; }
.gnau-change-list li { border-top: 1px solid var(--gnau-line); display: grid; gap: 8px; grid-template-columns: minmax(80px, 120px) 1fr; padding: 11px 0; }
.gnau-timeline__footer { border-top: 1px solid var(--gnau-line); color: var(--gnau-muted); font-size: 12px; margin-top: 20px; padding-top: 16px; }
.gnau-review-button { background: var(--gnau-primary); border-color: var(--gnau-primary); color: #fff; font-size: 13px; padding: 9px 13px; text-align: center; }
.gnau-review-button.is-reviewed, .gnau-review-button:disabled { background: #edf8f4; border-color: #a5d5c1; color: #287555; cursor: default; opacity: 1; }

.gnau-course-info { background: #fff; border: 1px solid var(--gnau-line); border-top: 5px solid var(--gnau-primary); border-radius: 18px; margin: 18px auto; max-width: 980px; padding: clamp(26px, 5vw, 48px); }
.gnau-course-info .gnau-eyebrow { color: var(--gnau-accent); }
.gnau-course-info .gnau-lead { color: var(--gnau-muted); }
.gnau-course-info__description { margin-top: 22px; }
.gnau-course-info__facts { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); margin-top: 26px; }
.gnau-course-info__facts div { background: var(--gnau-surface); border-radius: 12px; padding: 14px; }
.gnau-course-info__facts span { color: var(--gnau-muted); display: block; font-size: 11px; letter-spacing: .06em; text-transform: uppercase; }
.gnau-course-info__facts strong { display: block; margin-top: 3px; }

.gnau-message { background: #f4f8fb; border: 1px solid #cbd9e2; border-radius: 12px; margin: 15px 0; padding: 16px 18px; }

@media (max-width: 700px) {
  .gnau-lesson, .gnau-update-center { border-radius: 14px; }
  .gnau-lesson__header, .gnau-update-center__hero { display: block; }
  .gnau-version-badge { display: inline-block; margin-top: 22px; }
  .gnau-facts { grid-template-columns: 1fr; }
  .gnau-change-list li { grid-template-columns: 1fr; }
  .gnau-timeline { padding-left: 20px; padding-right: 20px; }
}

@media print {
  .gnau-progress, .gnau-review-button { display: none !important; }
  .gnau-lesson, .gnau-update-center { border: 0; box-shadow: none; }
  .gnau-decision__interactive { display: none !important; }
  .gnau-decision__fallback { display: block !important; }
}
[data-gnau-html-lesson] {
	display: block;
	width: 100%;
	max-width: 100%;
}

[data-gnau-html-lesson],
[data-gnau-html-lesson] * {
	box-sizing: border-box;
}