:root {
  --bg: #f3f6fc; --paper: #ffffff; --tint: #eaf0ff; --line: #d9e1f2; --ink: #0d1530; --text: #2b3550; --soft: #66708a;
  --blue: #1f45f0; --blue2: #1736c4; --navy: #0b2a8f; --deep: #071c63; --lime: #d9f20a; --on-lime: #0b2a8f; --amber: #b86b00;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --rad: 14px; --text-w: 760px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: 140px; overflow-x: clip; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.9 var(--font); overflow-wrap: anywhere; line-break: strict; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: underline; text-decoration-color: rgba(31, 69, 240, .35); text-decoration-thickness: 2px; text-underline-offset: 4px; }
a:hover { color: var(--navy); text-decoration-color: var(--navy); }
.lt-skip { position: absolute; left: -999px; top: 8px; background: var(--lime); color: var(--on-lime); padding: 8px 14px; border-radius: 8px; z-index: 99; }
.lt-skip:focus { left: 8px; }

/* bar: white row with the wordmark and the pill pair; blue section strip under it */
.lt-bar { position: sticky; top: 0; z-index: 40; background: var(--paper); box-shadow: 0 1px 0 var(--line), 0 6px 18px rgba(11, 42, 143, .06); }
.lt-bar__row { display: flex; align-items: center; gap: 16px; max-width: 1200px; margin: 0 auto; padding: 10px 20px; }
.lt-bar__mark { flex: none; text-decoration: none; }
.lt-bar__mark img, .lt-word { display: block; }
.lt-word { color: var(--blue); font-size: 25px; font-weight: 900; font-style: italic; letter-spacing: -.02em; line-height: 1; }
.lt-word i { font-style: normal; font-size: 14px; font-weight: 800; color: var(--navy); margin-left: 6px; letter-spacing: .08em; vertical-align: 3px; }
.lt-nav { order: 9; flex: 0 0 100vw; width: 100vw; margin: 0 calc(50% - 50vw) -10px; background: linear-gradient(90deg, var(--navy), var(--blue)); }
.lt-nav__list { list-style: none; margin: 0 auto; padding: 0 8px; max-width: 1200px; display: flex; flex-wrap: wrap; gap: 0; }
.lt-nav__list a { display: block; padding: 10px 18px; color: #e6ecff; text-decoration: none; font-size: 15.5px; font-weight: 700; letter-spacing: .04em; }
.lt-nav__list a:hover { color: #fff; background: rgba(255, 255, 255, .1); }
.lt-nav__list .is-here a { color: #fff; box-shadow: inset 0 -3px 0 var(--lime); }
.lt-bar__row { flex-wrap: wrap; }
.lt-bar__acts { flex: none; display: flex; gap: 10px; margin-left: auto; }
.lt-pill { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 0 20px; border-radius: 999px; background: var(--lime); color: var(--on-lime); font-weight: 900; font-size: 15px; text-decoration: none; white-space: nowrap; box-shadow: 0 2px 0 #a9bd00; }
.lt-pill:hover { color: var(--on-lime); filter: brightness(1.04); }
.lt-pill--line { background: transparent; border: 2px solid var(--blue); color: var(--blue); box-shadow: none; }
.lt-pill--line:hover { color: #fff; background: var(--blue); }
.lt-pill--big { min-height: 54px; padding: 0 40px; font-size: 17px; }
.lt-burger { display: none; width: 42px; height: 40px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper); cursor: pointer; padding: 11px 10px; flex-direction: column; justify-content: space-between; }
.lt-burger span { display: block; height: 2px; background: var(--navy); border-radius: 2px; }
.lt-burger i { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.lt-ticker { margin: 0; padding: 7px 20px; display: flex; justify-content: center; align-items: center; gap: 8px; background: var(--tint); color: var(--navy); font-size: 13.5px; font-weight: 700; line-height: 1.5; text-align: center; }
.lt-ticker svg { flex: none; width: 17px; height: 17px; fill: none; stroke: var(--blue); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }

/* page head */
.lt-head { max-width: 1114px; margin: 0 auto; padding: 34px 20px 6px; }
.lt-head--front { padding-top: 22px; }
.lt-h1 { max-width: 920px; font-size: clamp(28px, 4vw, 42px); line-height: 1.32; margin: 0 0 8px; color: var(--ink); font-weight: 900; letter-spacing: .01em; }
.lt-by { margin: 0 0 18px; font-size: 14px; color: var(--soft); }
.lt-by span:first-child { color: var(--blue); font-weight: 800; }
.lt-head__lead p { max-width: 860px; font-size: 18.5px; line-height: 1.85; color: var(--ink); margin: 0 0 18px; }
.lt-head__pic { margin-top: 18px; }
.lt-head__pic img { border-radius: var(--rad); }

/* front section tiles: one row, icon left */
.lt-board { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 12px 0 8px; }
.lt-board__card { position: relative; display: grid; grid-template-columns: 40px 1fr; column-gap: 10px; align-items: center; padding: 14px 14px; background: var(--paper); border: 1px solid var(--line); border-radius: 12px; text-decoration: none; color: var(--ink); transition: border-color .15s, transform .15s; }
.lt-board__card:hover { border-color: var(--blue); transform: translateY(-2px); color: var(--ink); }
.lt-board__card em { position: absolute; top: -9px; right: 10px; font-style: normal; font-size: 11.5px; font-weight: 900; color: var(--on-lime); background: var(--lime); border-radius: 999px; padding: 0 8px; line-height: 18px; }
.lt-board__card svg { grid-row: span 2; width: 40px; height: 40px; padding: 8px; border-radius: 10px; background: var(--tint); fill: none; stroke: var(--blue); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.lt-board__card b { font-size: 16px; line-height: 1.35; }
.lt-board__card span { font-size: 13px; line-height: 1.45; color: var(--soft); }

/* banner reel */
.lt-reel { max-width: 1200px; margin: 18px auto 0; padding: 0 20px; }
.lt-reel__rail { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none; border-radius: 16px; }
.lt-reel__rail::-webkit-scrollbar { display: none; }
.lt-reel__slide { flex: 0 0 100%; scroll-snap-align: start; display: block; }
.lt-reel__slide img { width: 100%; border-radius: 16px; }
.lt-reel__dots { display: flex; justify-content: center; gap: 7px; margin-top: 10px; }
.lt-reel__dots button { width: 9px; height: 9px; border-radius: 9px; border: 0; padding: 0; background: #c4cde6; cursor: pointer; transition: width .2s; }
.lt-reel__dots button[aria-current] { width: 26px; background: var(--blue); }

/* body: text on the left, contents rail on the right */
.lt-body { max-width: 1114px; margin: 0 auto; padding: 14px 20px 70px; }
.lt-body--rail { display: grid; grid-template-columns: minmax(0, var(--text-w)) 270px; gap: 44px; align-items: start; }
.lt-body:not(.lt-body--rail) .lt-text { max-width: var(--text-w); }
.lt-body__side { position: sticky; top: 140px; }
.lt-rail { background: var(--paper); border: 1px solid var(--line); border-top: 4px solid var(--blue); border-radius: 12px; padding: 6px 16px 12px; }
.lt-rail summary { cursor: pointer; padding: 8px 0; font-size: 14.5px; font-weight: 900; color: var(--navy); }
.lt-rail ol { margin: 0; padding: 0; list-style: none; }
.lt-rail li { margin: 0; font-size: 14.5px; line-height: 1.5; border-top: 1px dashed var(--line); }
.lt-rail a { display: block; padding: 7px 0; color: var(--text); text-decoration: none; }
.lt-rail a:hover { color: var(--blue); }
.lt-text { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 10px 34px 34px; }
.lt-text > p:first-child { margin-top: 24px; }
.lt-text h2 { font-size: clamp(22px, 2.7vw, 28px); line-height: 1.45; margin: 44px 0 14px; padding-left: 14px; border-left: 5px solid var(--blue); color: var(--ink); font-weight: 900; }
.lt-text h3 { font-size: 20px; line-height: 1.5; margin: 30px 0 10px; color: var(--navy); }
.lt-text h3::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 2px; background: var(--lime); box-shadow: 0 0 0 2px var(--navy); margin-right: 10px; vertical-align: 3px; }
.lt-text h4 { font-size: 18px; margin: 22px 0 8px; color: var(--ink); }
.lt-text strong, .lt-text b { color: var(--ink); }
.lt-text ul, .lt-text ol { padding-left: 24px; }
.lt-text li { margin: 6px 0; }
.lt-text li::marker { color: var(--blue); font-weight: 800; }

/* tables */
.lt-grid { margin: 24px 0; }
.lt-grid__x { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
.lt-grid table { width: 100%; border-collapse: collapse; font-size: 15.5px; line-height: 1.7; }
.lt-grid th { background: var(--navy); color: #fff; text-align: left; padding: 11px 14px; font-size: 14px; white-space: nowrap; }
.lt-grid td { padding: 11px 14px; border-top: 1px solid var(--line); vertical-align: top; }
.lt-grid tr:nth-child(even) td { background: #f7f9ff; }

/* components */
.lt-tip { margin: 24px 0; padding: 14px 18px 14px 20px; background: #fffbe8; border: 1px solid #f1df9c; border-left: 5px solid #e3b400; border-radius: 10px; }
.lt-tip p { margin: 0; }
.lt-tip__tag { font-weight: 900; color: var(--amber); }
.lt-sheet { margin: 24px 0; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--paper); }
.lt-sheet table { width: 100%; border-collapse: collapse; }
.lt-sheet th, .lt-sheet td { padding: 10px 16px; text-align: left; border-top: 1px solid var(--line); font-size: 15.5px; }
.lt-sheet thead th { border-top: 0; background: var(--tint); font-size: 13px; color: var(--navy); }
.lt-sheet td:first-child { color: var(--soft); width: 34%; background: #fafbff; }
.lt-sheet td:last-child { color: var(--ink); font-weight: 700; }
.lt-sheet dl { margin: 0; display: grid; grid-template-columns: minmax(0, 34%) 1fr; }
.lt-sheet dt, .lt-sheet dd { margin: 0; padding: 10px 16px; border-top: 1px solid var(--line); }
.lt-sheet dt { color: var(--soft); } .lt-sheet dd { color: var(--ink); font-weight: 700; }
.lt-steps { margin: 26px 0; padding: 0; list-style: none; counter-reset: st; border-left: 2px solid var(--line); margin-left: 16px; }
.lt-steps li { counter-increment: st; position: relative; margin: 0 0 16px; padding: 0 0 0 30px; min-height: 34px; }
.lt-steps li::before { content: counter(st); position: absolute; left: -17px; top: 1px; width: 32px; height: 32px; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 900; font-size: 15px; display: grid; place-items: center; box-shadow: 0 0 0 4px var(--paper); }
.lt-vs { margin: 26px 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.lt-vs__side { padding: 16px 18px; border-radius: 12px; border: 1px solid var(--line); }
.lt-vs__a { background: #f6f7fa; }
.lt-vs__b { background: var(--tint); border-color: var(--blue); }
.lt-vs__tag { display: block; font-size: 13px; font-weight: 900; color: var(--soft); margin-bottom: 6px; }
.lt-vs__b .lt-vs__tag { color: var(--blue); }
.lt-vs p { margin: 0; }
.lt-pic { margin: 30px 0; }
.lt-pic img { border-radius: 12px; }
.lt-pic__cap, .lt-pic figcaption { font-size: 14px; line-height: 1.6; color: var(--soft); margin-top: 8px; text-align: center; }
.lt-go { margin: 34px 0; padding: 26px; display: flex; justify-content: center; background: linear-gradient(120deg, var(--navy), var(--blue)); border-radius: var(--rad); }

/* FAQ */
.lt-faq { margin-top: 46px; }
.lt-faq__q { border: 1px solid var(--line); border-radius: 12px; margin: 8px 0; background: var(--paper); }
.lt-faq__q summary { cursor: pointer; padding: 13px 46px 13px 16px; font-weight: 800; color: var(--ink); list-style: none; position: relative; }
.lt-faq__q summary::-webkit-details-marker { display: none; }
.lt-faq__q summary::after { content: "+"; position: absolute; right: 16px; top: 10px; width: 24px; height: 24px; border-radius: 50%; background: var(--tint); color: var(--blue); font-weight: 900; text-align: center; line-height: 24px; }
.lt-faq__q[open] summary::after { content: "−"; }
.lt-faq__a { padding: 0 16px 10px; }

/* footer */
.lt-foot { background: var(--deep); color: #b9c4e8; }
.lt-foot__grid { max-width: 1200px; margin: 0 auto; padding: 40px 20px 20px; display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr); gap: 30px; }
.lt-foot__mark .lt-word { color: #fff; } .lt-foot__mark .lt-word i { color: var(--lime); }
.lt-foot__mark p { margin: 10px 0 0; font-size: 13.5px; line-height: 1.7; }
.lt-foot__col b { display: block; margin-bottom: 10px; color: #fff; font-size: 14.5px; }
.lt-foot__list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.lt-foot__list a { color: #dfe6ff; text-decoration: none; font-size: 14.5px; }
.lt-foot__list a:hover { color: var(--lime); }
.lt-foot__age { max-width: 1200px; margin: 0 auto; padding: 14px 20px 30px; font-size: 13px; border-top: 1px solid rgba(255, 255, 255, .12); }
.lt-foot__age b { display: inline-block; color: var(--on-lime); background: var(--lime); border-radius: 4px; padding: 0 6px; margin-right: 6px; }

@media (max-width: 1100px) {
  .lt-body--rail { display: flex; flex-direction: column-reverse; gap: 12px; }
  .lt-body__side { position: static; width: 100%; }
  .lt-board { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .lt-burger { display: flex; order: 2; }
  .lt-nav { display: none; }
  .lt-open .lt-nav { display: block; }
  .lt-nav__list { flex-direction: column; padding: 6px 16px 12px; }
}
@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .lt-bar__row { gap: 8px; padding: 8px 16px; }
  .lt-nav { margin-bottom: -8px; }
  .lt-bar__mark img { width: 120px; height: auto; }
  .lt-bar__acts { order: 3; width: 100%; margin: 0; }
  .lt-bar__acts .lt-pill { flex: 1; min-height: 38px; padding: 0 10px; font-size: 14px; }
  .lt-burger { margin-left: auto; }
  .lt-ticker { padding: 6px 16px; font-size: 12.5px; }
  .lt-head, .lt-body, .lt-reel { padding-left: 16px; padding-right: 16px; }
  .lt-text { padding: 4px 16px 24px; border-radius: 12px; }
  .lt-board { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .lt-board__card { grid-template-columns: 1fr; }
  .lt-board__card svg { grid-row: auto; margin-bottom: 6px; }
  .lt-vs, .lt-foot__grid { grid-template-columns: 1fr; }
  .lt-pill--big { width: 100%; }
  .lt-grid--stack table, .lt-grid--stack tbody, .lt-grid--stack tr, .lt-grid--stack td { display: block; width: 100%; }
  .lt-grid--stack thead { display: none; }
  .lt-grid--stack tr { border-top: 1px solid var(--line); padding: 6px 0; }
  .lt-grid--stack td { border: 0; padding: 4px 14px; background: none !important; }
  .lt-grid--stack td::before { content: attr(data-k); display: block; font-size: 12px; color: var(--soft); }
}