/* public/css/learn.css — public catalog /learn (lib/learnPages.js). Loaded after landing.css,
   landing-blog.css and blog.css (header, footer, .lp-container, .b-hero, .b-btn come from there).
   bootstrap.min.css is loaded first for the lesson markup, which is written with Bootstrap classes. */

body { background: var(--lp-white); color: var(--lp-ink); font-family: 'Manrope', 'Segoe UI', sans-serif; }
a { text-decoration: none; }
.site-header a, .site-footer a { text-decoration: none; }

.lv-hero { padding: 54px 0 34px; }
.lv-hero .lp-section-heading { margin-bottom: 14px; }
.lv-hero .lp-section-lede { max-width: 860px; }
.lv-crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 4px 0; font-size: 13px; font-weight: 700; color: var(--lp-ink-soft); margin-bottom: 22px; }
.lv-crumbs li + li::before { content: '/'; margin: 0 9px; color: #9fb3c8; }
.lv-crumbs a { color: var(--lp-blue-deep); }
.lv-crumbs a:hover { color: var(--lp-blue); }
.lv-stats { margin-top: 12px; color: var(--lp-ink-soft); font-size: 15px; }
.lv-stats strong { color: var(--lp-ink); }

.lv-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.lv-chips a { display: inline-flex; align-items: center; gap: 7px; padding: 7px 13px; border-radius: 999px; background: var(--lp-white); border: 1px solid var(--lp-border); color: var(--lp-blue-deep); font-size: 13px; font-weight: 800; }
.lv-chips a:hover { border-color: var(--lv-color, var(--lp-blue)); color: var(--lp-ink); }
.lv-chips a span { color: var(--lp-ink-soft); font-weight: 700; }
.lv-chips.is-subjects a i { color: var(--lv-color); }

.lv-body { padding: 40px 0 90px; }
.lv-subject { border: 1px solid var(--lp-border); border-radius: 22px; padding: 26px 28px; margin-bottom: 22px; background: var(--lp-white); border-top: 5px solid var(--lv-color); scroll-margin-top: 110px; }
.lv-subject-head { display: grid; grid-template-columns: auto 1fr auto; gap: 16px; align-items: center; }
.lv-subject-head h2 { margin: 0; font-family: 'Sora', 'Segoe UI', sans-serif; font-size: 25px; line-height: 1.2; }
.lv-subject-head h2 a { color: var(--lp-ink); }
.lv-subject-head h2 a:hover { color: var(--lv-color); }
.lv-subject-head p { margin: 4px 0 0; color: var(--lp-ink-soft); font-size: 15px; line-height: 1.5; }
.lv-subject-icon { width: 52px; height: 52px; border-radius: 15px; display: grid; place-items: center; font-size: 22px; color: var(--lv-color); background: color-mix(in srgb, var(--lv-color) 13%, white); flex: 0 0 auto; }
.lv-subject-icon.is-large { width: 64px; height: 64px; font-size: 28px; border-radius: 18px; }
.lv-count { font-weight: 800; color: var(--lp-blue); white-space: nowrap; font-size: 14px; }
.lv-subject .lv-chips { margin-top: 18px; }
.lv-all { display: inline-block; margin-top: 14px; font-weight: 800; color: var(--lp-blue); font-size: 14px; }
.lv-all:hover { color: var(--lp-blue-deep); }
.lv-title-row { display: flex; align-items: center; gap: 18px; margin-bottom: 14px; }
.lv-title-row .lp-section-heading { margin: 0; }

.lv-topic-list { list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 8px 22px; margin-top: 16px; counter-reset: lv; }
.lv-topic-list li { display: flex; align-items: baseline; gap: 6px; min-width: 0; padding: 8px 0; border-bottom: 1px dashed var(--lp-border); font-size: 15px; line-height: 1.45; }
.lv-topic-list li::before { content: ''; flex: 0 0 7px; height: 7px; border-radius: 50%; background: var(--lv-color, var(--lp-blue)); transform: translateY(-2px); }
.lv-topic-list a { color: var(--lp-ink); font-weight: 600; }
.lv-topic-list a:hover { color: var(--lp-blue); }
.lv-topic-list.is-compact { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.lv-badge { font-size: 10px; font-weight: 800; letter-spacing: .05em; color: var(--lp-ink-soft); border: 1px solid var(--lp-border); border-radius: 6px; padding: 1px 5px; }

.lv-group { margin-bottom: 34px; scroll-margin-top: 110px; }
.lv-group h2 { font-family: 'Sora', 'Segoe UI', sans-serif; font-size: 24px; margin: 0; padding-bottom: 10px; border-bottom: 3px solid var(--lv-color); display: flex; align-items: baseline; gap: 12px; }
.lv-group h2 span { font-family: 'Manrope', 'Segoe UI', sans-serif; font-size: 14px; color: var(--lp-ink-soft); font-weight: 700; }

/* ---------- topic page */
.lv-hero.is-topic { padding-bottom: 28px; }
.lv-topic-title { font-family: 'Sora', 'Segoe UI', sans-serif; font-size: clamp(30px, 4vw, 48px); font-weight: 700; line-height: 1.12; letter-spacing: -0.02em; color: var(--lp-ink); margin: 0 0 18px; max-width: 980px; }
.lv-meta { display: flex; flex-wrap: wrap; gap: 8px; }
.lv-pill { display: inline-flex; align-items: center; gap: 7px; padding: 6px 12px; border-radius: 10px; background: var(--lp-white); border: 1px solid var(--lp-border); font-size: 13px; font-weight: 800; color: var(--lp-blue-deep); }
.lv-pill i { color: var(--lv-color); }
a.lv-pill:hover { border-color: var(--lv-color); }

.lv-topic-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 36px; align-items: start; }
.lv-notice { background: var(--lp-orange-pale); border-left: 4px solid var(--lp-orange); border-radius: 0 12px 12px 0; padding: 12px 16px; font-size: 14px; margin-bottom: 18px; }
.lv-preview-label { font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .12em; color: var(--lp-orange-dark); margin-bottom: 10px; display: flex; align-items: center; gap: 9px; }
.lv-preview-label::before { content: ''; width: 26px; height: 3px; border-radius: 999px; background: var(--lp-orange); }

.lv-lesson { position: relative; border: 1px solid var(--lp-border); border-radius: 20px; padding: 26px 26px 48px; overflow: hidden; background: var(--lp-white); }
.lv-fade { position: absolute; left: 0; right: 0; bottom: 0; height: 110px; background: linear-gradient(to bottom, rgba(255, 255, 255, 0), #fff 78%); pointer-events: none; }
/* lesson markup: restore the spacing the page-wide reset (blog.css) removed */
.lv-lesson-inner { font-size: 16px; line-height: 1.65; color: #212529; }
.lv-lesson-inner p, .lv-lesson-inner ul, .lv-lesson-inner ol, .lv-lesson-inner table, .lv-lesson-inner blockquote, .lv-lesson-inner pre, .lv-lesson-inner figure { margin-bottom: 1rem; }
.lv-lesson-inner h1, .lv-lesson-inner h2, .lv-lesson-inner h3, .lv-lesson-inner h4, .lv-lesson-inner h5, .lv-lesson-inner h6 { margin-bottom: .6rem; line-height: 1.25; }
.lv-lesson-inner ul, .lv-lesson-inner ol { padding-left: 1.6rem; }
.lv-lesson-inner li + li { margin-top: .25rem; }
.lv-lesson-inner .row { margin-bottom: 1rem; }
.lv-lesson-inner .card { margin-bottom: 1rem; }
.lv-lesson-inner .card-body > :last-child, .lv-lesson-inner .alert > :last-child { margin-bottom: 0; }
.lv-lesson-inner svg { max-width: 100%; height: auto; }
.lv-lesson-inner img { max-width: 100%; height: auto; }
.lv-lesson-inner table { display: block; max-width: 100%; overflow-x: auto; }
.lv-lesson-inner pre { white-space: pre-wrap; background: #f5f9fc; padding: 12px 14px; border-radius: 10px; font-size: 14px; }
.lv-lesson-inner a { color: var(--lp-blue); text-decoration: underline; }
.lv-lesson-inner .lv-term { color: var(--lp-blue-deep); font-weight: 700; border-bottom: 1px dashed var(--lp-blue); }
.lv-lesson-inner .lv-static-head { font-weight: 800; padding: .75rem 1rem; background: var(--lp-blue-pale); border-radius: 10px; margin-bottom: .5rem; }
.lv-interactive { display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 92px; margin: 12px 0; padding: 16px; border: 2px dashed var(--lp-border); border-radius: 16px; background: var(--lp-mist); color: var(--lp-blue-deep); font-weight: 800; font-size: 14px; text-align: center; }
.lv-interactive i { color: var(--lp-orange); font-size: 20px; }

.lv-cta { margin-top: 22px; display: flex; flex-wrap: wrap; align-items: center; gap: 18px 26px; padding: 26px 28px; border-radius: 22px; background: linear-gradient(135deg, var(--lp-blue-dark), var(--lp-blue)); color: #fff; }
.lv-cta-text { flex: 1 1 380px; }
.lv-cta h2 { font-family: 'Sora', 'Segoe UI', sans-serif; font-size: clamp(21px, 2.3vw, 27px); line-height: 1.2; margin-bottom: 8px; color: #fff; }
.lv-cta p { color: rgba(255, 255, 255, .86); line-height: 1.6; font-size: 15px; }
.lv-cta-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.lv-cta .b-btn.is-blue { background: #fff; color: var(--lp-blue-deep); }
.lv-cta .b-btn.is-blue:hover { background: var(--lp-blue-pale); }
.lv-cta .b-btn.is-quiet { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .55); }
.lv-cta .b-btn.is-quiet:hover { background: rgba(255, 255, 255, .12); }
.lv-body > .lp-container > .lv-cta { margin-top: 36px; }

.lv-full { margin-top: 22px; padding: 22px 26px; border: 1px solid var(--lp-border); border-radius: 20px; background: var(--lp-blue-pale); }
.lv-full h2 { font-family: 'Sora', 'Segoe UI', sans-serif; font-size: 20px; margin-bottom: 12px; }
.lv-full ul { list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px 18px; }
.lv-full li { display: flex; gap: 10px; align-items: baseline; font-weight: 700; font-size: 15px; }
.lv-full li i { color: var(--lp-blue); width: 18px; text-align: center; }

.lv-prevnext { margin-top: 22px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.lv-prevnext a { display: flex; flex-direction: column; gap: 4px; padding: 14px 18px; border: 1px solid var(--lp-border); border-radius: 16px; color: var(--lp-ink); }
.lv-prevnext a:hover { border-color: var(--lp-blue); }
.lv-prevnext a.is-next { text-align: right; }
.lv-prevnext small { color: var(--lp-blue); font-weight: 800; font-size: 12px; }
.lv-prevnext strong { font-size: 15px; line-height: 1.35; }

.lv-side { position: sticky; top: 100px; border: 1px solid var(--lp-border); border-radius: 20px; padding: 20px; max-height: calc(100vh - 120px); overflow: auto; background: var(--lp-white); }
.lv-side h2 { font-family: 'Sora', 'Segoe UI', sans-serif; font-size: 17px; line-height: 1.3; margin-bottom: 4px; }
.lv-topic-list.is-side { grid-template-columns: 1fr; gap: 0; margin-top: 8px; }
.lv-topic-list.is-side li { font-size: 14px; padding: 7px 0; }
.lv-topic-list.is-side li.is-current { font-weight: 800; color: var(--lv-color); }

@media (max-width: 1100px) {
  .lv-topic-layout { grid-template-columns: 1fr; }
  .lv-side { position: static; max-height: none; }
}
@media (max-width: 680px) {
  .lv-hero { padding: 34px 0 24px; }
  .lv-subject { padding: 20px 18px; }
  .lv-subject-head { grid-template-columns: auto 1fr; }
  .lv-count { grid-column: 1 / -1; }
  .lv-lesson { padding: 18px 16px 64px; border-radius: 16px; }
  .lv-cta { padding: 22px 18px; }
  .lv-cta-actions { width: 100%; }
  .lv-cta-actions .b-btn { flex: 1 1 100%; }
  .lv-prevnext { grid-template-columns: 1fr; }
  .lv-prevnext a.is-next { text-align: left; }
  .lv-topic-list, .lv-topic-list.is-compact { grid-template-columns: 1fr; }
}