.ia-learning {
  --ia-ink: #172033;
  --ia-muted: #566176;
  --ia-brand: #2446a8;
  --ia-brand-dark: #183176;
  --ia-accent: #0f766e;
  --ia-surface: #fff;
  --ia-soft: #f2f5fb;
  --ia-border: #d6ddeb;
  box-sizing: border-box;
  max-width: 76rem;
  margin-inline: auto;
  padding: clamp(1rem, 4vw, 3rem);
  color: var(--ia-ink);
}
.ia-learning *, .ia-learning *::before, .ia-learning *::after { box-sizing: border-box; }
.ia-learning__hero { padding-block: clamp(2rem, 8vw, 6rem); }
.ia-learning h1 { max-width: 18ch; margin-block: .4rem 1rem; font-size: clamp(2.25rem, 7vw, 4.75rem); line-height: 1.02; letter-spacing: -.035em; }
.ia-learning__lead { max-width: 62ch; color: var(--ia-muted); font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.6; }
.ia-eyebrow { margin: 0; color: var(--ia-brand); font-size: .82rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.ia-learning__actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-block: 2rem; }
.ia-button { display: inline-flex; align-items: center; min-height: 2.8rem; padding: .65rem 1rem; border: 2px solid var(--ia-brand); border-radius: .55rem; color: var(--ia-brand-dark); font-weight: 750; text-decoration: none; }
.ia-button--primary { background: var(--ia-brand); color: #fff; }
.ia-button:hover { background: var(--ia-soft); }
.ia-button--primary:hover { background: var(--ia-brand-dark); }
.ia-button:focus-visible, .ia-learning a:focus-visible { outline: .22rem solid #f5a800; outline-offset: .18rem; }
.ia-continue { max-width: 42rem; padding: 1rem; border-inline-start: .35rem solid var(--ia-accent); border-radius: .35rem; background: #eaf8f5; }
.ia-topic-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); gap: 1rem; }
.ia-topic-card { min-width: 0; padding: 1.25rem; border: 1px solid var(--ia-border); border-radius: .8rem; background: var(--ia-surface); box-shadow: 0 .25rem 1.25rem rgb(24 49 118 / 7%); }
.ia-topic-card h3 { margin-block: .5rem; font-size: 1.25rem; }
.ia-topic-card h3 a { color: var(--ia-ink); text-decoration-thickness: .12em; text-underline-offset: .2em; }
.ia-topic-card__meta, .ia-exercise-links span { color: var(--ia-muted); font-size: .9rem; }
.ia-breadcrumb { display: flex; flex-wrap: wrap; gap: .5rem; color: var(--ia-muted); font-size: .92rem; }
.ia-topic__header { padding-block: clamp(2rem, 6vw, 4rem); }
.ia-lesson-list { display: grid; gap: .65rem; padding: 0; list-style: none; counter-reset: lesson; }
.ia-lesson-list li { counter-increment: lesson; }
.ia-lesson-list a { display: grid; grid-template-columns: 2.4rem minmax(0, 1fr); gap: .15rem .75rem; align-items: center; padding: .9rem 1rem; border: 1px solid var(--ia-border); border-radius: .6rem; color: var(--ia-ink); text-decoration: none; }
.ia-lesson-list a::before { grid-row: 1 / 3; content: counter(lesson); display: grid; place-items: center; inline-size: 2.1rem; block-size: 2.1rem; border-radius: 50%; background: var(--ia-soft); color: var(--ia-brand); font-weight: 800; }
.ia-lesson-list a:hover { border-color: var(--ia-brand); background: var(--ia-soft); }
.ia-lesson-list small { color: var(--ia-muted); }
.ia-notice { max-width: 50rem; margin-block: 2rem; padding: 1rem 1.2rem; border: 1px solid #e8cf77; border-radius: .55rem; background: #fff9df; }
.ia-exercise-links { display: grid; gap: .75rem; padding: 0; list-style: none; }
.ia-exercise-links a { display: grid; gap: .2rem; padding: 1rem; border: 1px solid var(--ia-border); border-radius: .6rem; color: var(--ia-ink); text-decoration: none; }
@media (max-width: 32rem) { .ia-learning__actions > * { width: 100%; justify-content: center; } }