.lv-lede{max-width:620px;color:var(--ink-soft)}.lv-section{padding-top:48px}.lv{max-width:760px;margin:0 auto;scroll-margin-top:96px}.lv,.level-promo{--lv-tint: color-mix(in srgb, var(--ink) 6%, var(--paper-card))}.lv-card{background:var(--paper-card);border:1px solid var(--line);border-radius:var(--radius-xl);padding:32px;box-shadow:var(--shadow-soft)}.lv-card+.lv-card{margin-top:18px}.lv-small{font-size:.9rem}.lv-facts{display:grid;gap:16px;margin-bottom:22px}.lv-facts li{display:flex;gap:14px;align-items:flex-start}.lv-facts svg{flex:none;width:40px;height:40px;padding:9px;border-radius:12px;color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent)}.lv-facts strong{display:block;font-size:1.02rem;margin-bottom:2px}.lv-facts li>span>span{color:var(--ink-soft);font-size:.95rem;line-height:1.5}.lv-progress{display:flex;align-items:center;gap:14px;margin-bottom:22px}.lv-count{flex:none;font-weight:700;font-size:.92rem;font-variant-numeric:tabular-nums}.lv-bar{flex:1;height:8px;border-radius:999px;overflow:hidden;background:var(--lv-tint);border:1px solid var(--line)}.lv-bar>span{display:block;height:100%;width:10%;background:var(--accent);border-radius:inherit;transition:width .26s var(--ease-standard)}.lv-topic{display:inline-block;margin-bottom:12px;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}.lv-text{font-size:1.12rem;line-height:1.65;color:var(--ink);margin-bottom:18px;overflow-wrap:anywhere}.lv-expr{white-space:nowrap;font-weight:600}.lv-text sup,.lv-sol sup,.lv-text sub,.lv-sol sub{font-size:.72em;line-height:0}.lv-frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;margin:0 .12em;line-height:1.15;font-size:.92em}.lv-frac>span{padding:0 .2em}.lv-frac>span:first-child{border-bottom:1.5px solid currentColor}.lv-figure{margin:0 0 20px;padding:14px;border-radius:var(--radius-md);background:var(--lv-tint)}.lv-fig{width:100%;max-width:420px;height:auto;margin:0 auto;color:var(--ink)}.lv-fig--ladder{max-width:260px}.lv-fig-line line,.lv-fig-line path{stroke:currentColor;stroke-width:2;fill:none;stroke-linecap:round;stroke-linejoin:round}.lv-fig-accent{stroke:var(--accent);stroke-width:4;stroke-linecap:round}.lv-fig-dot{fill:var(--accent);stroke:var(--lv-tint);stroke-width:2}.lv-fig text{fill:currentColor;font-family:var(--font-body)}.lv-fig-num{font-size:13px;text-anchor:middle}.lv-fig-label{font-size:15px;font-weight:700;text-anchor:middle}.lv-label{display:block;font-weight:700;margin-bottom:8px}.lv-input{width:100%;max-width:280px;font:inherit;font-size:1.15rem;font-weight:600;color:var(--ink);padding:12px 16px;border-radius:var(--radius-md);background:var(--paper);border:2px solid var(--line)}.lv-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 22%,transparent)}.lv-input[aria-invalid=true]{border-color:var(--accent-hover)}.lv-hint{font-size:.85rem;margin:8px 0 0}.lv-note{min-height:1.4em;margin:6px 0 12px;font-size:.9rem;font-weight:600;color:var(--ink)}.lv-note:empty{margin-bottom:6px}.lv-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px}.lv-actions--center{justify-content:center;margin:26px 0 8px}.lv-back{display:inline-flex;align-items:center;gap:6px;padding:10px 6px;border:0;background:none;color:var(--ink-soft);font-weight:600;font-size:.95rem}.lv-back:hover{color:var(--accent)}.lv-quiz .lv-back{margin-left:auto}.lv-score-title{font-size:clamp(1.8rem,5vw,2.4rem);margin:0 0 12px}.lv-score-title:focus{outline:none}.lv-score{color:var(--accent)}.lv-verdict{font-size:1.08rem;color:var(--ink)}.lv-topics-wrap{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:22px 0 8px}.lv-topics{padding:18px;border-radius:var(--radius-md);background:var(--lv-tint)}.lv-topics h3{font-size:1rem;margin:0 0 10px}.lv-topics li{display:flex;gap:8px;align-items:flex-start;padding:5px 0;font-size:.95rem;line-height:1.4}.lv-topics svg{flex:none;margin-top:1px}.lv-topics--ok svg{color:var(--accent)}.lv-topics--todo svg{color:var(--ink-soft)}.lv-scale{margin-top:14px;font-size:.92rem;color:var(--ink-soft)}.lv-scale summary{cursor:pointer;font-weight:600;color:var(--ink);width:fit-content}.lv-scale ul{margin-top:10px;display:grid;gap:4px}.lv-scale b{color:var(--ink)}.lv-next h3{margin:0 0 8px}.lv-solutions ol{display:grid;gap:14px;margin:18px 0 0;padding:0;list-style:none}.lv-sol{padding:22px;border-radius:var(--radius-lg);background:var(--paper-card);border:1px solid var(--line)}.lv-sol p{margin:0 0 8px}.lv-sol p:last-child{margin-bottom:0}.lv-sol-head{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin-bottom:10px}.lv-sol-n{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;font-weight:700;font-size:.85rem;background:var(--lv-tint)}.lv-sol-topic{font-weight:700}.lv-sol-mark{display:inline-flex;align-items:center;gap:5px;margin-left:auto;font-size:.85rem;font-weight:600;color:var(--ink-soft)}.lv-sol.is-right .lv-sol-mark{color:var(--accent)}.lv-sol-task,.lv-sol-answers b{color:var(--ink)}.lv-sol-text{line-height:1.65}@media(max-width:620px){.lv-card{padding:22px 18px;border-radius:var(--radius-lg)}.lv-topics-wrap{grid-template-columns:1fr}.lv-text{font-size:1.04rem}.lv-input{max-width:none}.lv-sol{padding:18px 16px}.lv-actions .btn{flex:1 1 auto;justify-content:center}}.level-promo{display:flex;align-items:center;gap:22px;padding:26px 30px;border-radius:var(--radius-xl);background:var(--paper-card);border:1px solid var(--line)}.level-promo__icon{flex:none;width:56px;height:56px;border-radius:16px;display:grid;place-items:center;color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent)}.level-promo__text{flex:1;min-width:0}.level-promo__text .eyebrow{margin-bottom:6px}.level-promo__text h2,.level-promo__text h3{font-size:1.3rem;margin:0 0 6px}.level-promo__text p{margin:0}.level-promo .btn{flex:none}@media(max-width:720px){.level-promo{flex-direction:column;align-items:flex-start;padding:22px 20px}.level-promo .btn{width:100%;justify-content:center}}