/* Learning path and a light lesson-shell polish. Lesson exercises stay in app.js. */
#main:has(.ln)+.site-footer{margin-top:0}
.ln{--ink:#0d274d;--muted:#314864;--blue:#0b6adf;--navy:#071e49;--yellow:#f0c230;--line:#d5e4f4;color:var(--ink);background:#f4f8fc}
.ln-wrap{width:min(1180px,calc(100% - 48px));margin-inline:auto}
.ln-hero{padding:28px 0 8px}
.ln-kicker{display:inline-flex;align-items:center;gap:8px;margin:0 0 8px;font-size:.78rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#0b5fbe}
.ln-kicker:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--yellow);box-shadow:0 0 0 4px rgba(240,194,48,.28)}
.ln h1{margin:0 0 8px;font-size:clamp(2rem,4vw,3.1rem);line-height:1.08;letter-spacing:-.03em;color:#08275f}
.ln-lead{margin:0;max-width:68ch;color:var(--muted);font-size:1.08rem}
.ln-steps{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 0;padding:0;list-style:none}
.ln-steps li,.ln-steps a{display:flex;align-items:center;gap:8px;min-height:44px;padding:6px 10px 6px 6px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--muted);font-weight:800}
.ln-steps a{text-decoration:none}
.ln-steps span{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:#e7f1fb;color:#084eae}
.ln-steps .is-done{color:#084eae}
.ln-steps .is-now{background:var(--navy);border-color:var(--navy);color:#fff}
.ln-steps .is-now span{background:var(--yellow);color:#10284d}
.ln-body{padding:18px 0 48px}
.ln-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.ln-choice{display:flex;flex-direction:column;align-items:flex-start;gap:8px;min-height:180px;padding:20px;border-radius:22px;background:#fff;border:1px solid var(--line);color:inherit;box-shadow:0 10px 24px rgba(8,39,95,.05)}
.ln-choice h2{margin:0;font-size:1.55rem;line-height:1.2;color:#08275f}
.ln-choice p{margin:0;color:var(--muted);font-size:1.02rem}
.ln-choice.is-quiet{background:#f8fbfe}
.ln-index{font-weight:800;color:#0b5fbe}
.ln-go{margin-top:auto;display:inline-flex;align-items:center;min-height:44px;padding:0 14px;border-radius:12px;background:var(--blue);color:#fff;font-weight:800}
.ln-note{margin:14px 0 0;color:var(--muted);font-weight:700}
.ln-switch{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.ln-switch a{display:inline-flex;align-items:center;min-height:48px;padding:8px 14px;border-radius:14px;border:1px solid var(--line);background:#fff;font-weight:800;color:var(--ink)}
.ln-switch a.is-on{background:var(--navy);border-color:var(--navy);color:#fff}
.ln-grades{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}
.ln-grade{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:112px;border-radius:20px;background:#fff;border:1px solid var(--line);color:#08275f;box-shadow:0 8px 18px rgba(8,39,95,.04)}
.ln-grade b{font-size:2rem;line-height:1}
.ln-grade small{font-weight:800;color:var(--muted)}
.ln-grade:hover,.ln-choice:hover,.ln-switch a:hover{border-color:#8eb7e4}
.ln-current{margin:0 0 12px;font-weight:800;color:#084eae}
.ln-current a{color:inherit}
.ln-tools{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;align-items:end}
.ln-quarters{display:flex;flex-wrap:wrap;gap:8px}
.ln-quarters button{min-height:48px;padding:0 14px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:800}
.ln-quarters button.is-on{background:var(--blue);border-color:var(--blue);color:#fff}
.ln-search{display:grid;gap:6px;font-weight:800;color:var(--muted);min-width:min(100%,280px)}
.ln-search input{min-height:48px;border-radius:12px;border:1px solid var(--line);padding:0 12px;color:var(--ink);background:#fff}
.ln-count{margin:12px 0;font-weight:800;color:#084eae}
.ln-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.ln-cards .empty-card{grid-column:1/-1}
.ln-card{display:flex;flex-direction:column;gap:8px;min-height:220px;padding:16px;border-radius:20px;background:#fff;border:1px solid var(--line)}
.ln-card-k{display:flex;justify-content:space-between;gap:8px;align-items:center;font-weight:800}
.ln-card-k span{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:#e7f1fb;color:#084eae}
.ln-card-k small,.ln-section{color:var(--muted);font-weight:700}
.ln-card h3{margin:0;font-size:1.2rem;line-height:1.3;color:#08275f}
.ln-section{margin:0}
.ln-goals{margin:0;padding:0;list-style:none;display:grid;gap:6px}
.ln-goals li{display:flex;gap:8px;align-items:flex-start;color:var(--ink)}
.ln-goals code{flex:none;padding:2px 6px;border-radius:8px;background:#e7f1fb;color:#084eae;font-weight:800}
.ln-more{color:var(--muted);font-weight:800}
.ln-open{margin-top:auto;display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 16px;border-radius:12px;background:#fff;border:2px solid var(--blue);color:#084eae;font-weight:800;align-self:flex-start}
.ln-open:hover{background:var(--blue);color:#fff}
.lesson-hero{display:flex;justify-content:space-between;gap:18px;align-items:center;background:#071e49;color:#fff;border-radius:28px;padding:26px}
.lesson-hero h1,.lesson-hero small,.lesson-hero p{color:#fff}
.lesson-hero p,.lesson-hero small{color:#d5e6fb}
.lesson-modules{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.module-btn{min-height:92px;border-radius:16px;border:1px solid #d5e4f4;background:#fff;color:#0d274d;text-align:left;padding:12px}
.module-btn.active{background:#071e49;color:#fff;border-color:#071e49}
.module-btn.active small,.module-btn.active b{color:#fff}
.objective{border:1px solid #d5e4f4;border-radius:14px;background:#fff}

@media (min-width:1500px){
  .ln-wrap{width:min(1200px,calc(100% - 80px))}
}
@media (max-width:900px){
  .ln-grades{grid-template-columns:repeat(3,minmax(0,1fr))}
  .ln-cards,.ln-grid,.lesson-modules{grid-template-columns:1fr 1fr}
  .lesson-hero{display:block}
}
@media (max-width:640px){
  .ln-wrap{width:min(100% - 32px,1180px)}
  .ln-grid,.ln-cards,.ln-grades,.lesson-modules{grid-template-columns:1fr}
  .ln-grades{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ln-steps{display:grid}
}
@media (prefers-reduced-motion:no-preference){
  .ln-choice,.ln-grade,.ln-open,.ln-quarters button,.ln-switch a{transition:transform .18s ease,background .18s ease,border-color .18s ease}
  .ln-choice:hover,.ln-grade:hover{transform:translateY(-2px)}
  .ln-reveal:not(.is-in){opacity:0;transform:translateY(14px)}
  .ln-reveal.is-in{opacity:1;transform:none;transition:opacity .5s ease,transform .5s ease}
}