/* ==========================================================
   CodeStory: the free learning pages (learn-new.html and the 20 guide pages)
   Documentation layout, the way Programiz and GeeksforGeeks do it: the whole syllabus in a
   rail on the left, the article in the middle, the page's own contents on the right.
   Loads after home-new.css and online-new.css and uses their tokens, nav, buttons and FAQ.
   Prefix ln-. Owner rules: no eyebrow labels, green CTAs, no drop shadows, no em dashes.
   ========================================================== */
.ln-ic { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.ln-page { background: #fff; }

/* ---------- the frame: rail, article, contents ---------- */
.ln-doc { max-width: 1400px; margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 264px minmax(0, 1fr) 232px; gap: 40px; align-items: start; }
.ln-doc--hub { grid-template-columns: 264px minmax(0, 1fr); }
.ln-rail { position: sticky; top: 78px; max-height: calc(100vh - 96px); overflow-y: auto; padding: 22px 8px 40px 0; scrollbar-width: thin; }
.ln-rail::-webkit-scrollbar { width: 6px; }
.ln-rail::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 99px; }
.ln-rail-top { padding: 0 10px 10px; }
.ln-rail-top a { font-family: var(--f-display); font-weight: 700; font-size: 15px; color: var(--ink); text-decoration: none; }
.ln-rail-top span { display: block; margin-top: 2px; font-size: 12.5px; color: var(--nh-muted); }
.ln-rail h3 { margin: 18px 0 6px; padding: 0 10px; font-family: var(--f-mono); font-size: 11.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--nh-muted); }
.ln-rail ul { list-style: none; margin: 0; padding: 0; }
.ln-rail a.ln-rail-link {
  display: block; padding: 7px 10px; border-radius: 8px; font-size: 14.5px; line-height: 1.4; color: var(--ink-2); text-decoration: none;
  transition: background-color .15s, color .15s;
}
.ln-rail a.ln-rail-link:hover { background: var(--bg-alt); color: var(--ink); }
.ln-rail a.is-here { background: var(--accent-tint); color: var(--accent); font-weight: 600; }
.ln-rail-cta { margin: 20px 10px 0; padding: 14px; border-radius: 14px; background: var(--ink); color: #fff; }
.ln-rail-cta b { display: block; font-family: var(--f-display); font-weight: 600; font-size: 14.5px; }
.ln-rail-cta span { display: block; margin: 4px 0 10px; font-size: 13px; line-height: 1.45; color: #B8BED3; }
.ln-rail-cta a { display: inline-flex; align-items: center; gap: 6px; font-family: var(--f-display); font-weight: 600; font-size: 13.5px; color: #F6A283; text-decoration: none; }

.ln-main { padding: 30px 0 60px; min-width: 0; }
.ln-side { position: sticky; top: 78px; padding: 30px 0 40px; }

/* ---------- the article ---------- */
.ln-crumbs { display: flex; flex-wrap: wrap; gap: 6px; font-size: 13px; color: var(--nh-muted); }
.ln-crumbs a { color: var(--nh-muted); text-decoration: none; }
.ln-crumbs a:hover { color: var(--accent); text-decoration: underline; }
.ln-main h1 { margin: 10px 0 0; font-family: var(--f-display); font-weight: 700; font-size: clamp(30px, 3vw, 40px); line-height: 1.15; letter-spacing: -.03em; color: var(--ink); }
.ln-by { margin: 10px 0 0; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; font-size: 13.5px; color: var(--nh-muted); }
.ln-by b { font-weight: 600; color: var(--ink-2); }
.ln-lead { margin: 18px 0 0; font-size: 17.5px; line-height: 1.7; color: var(--ink); }
.ln-note { margin-top: 18px; padding: 14px 18px; border-left: 3px solid var(--accent); background: var(--accent-tint); font-size: 15.5px; line-height: 1.6; color: var(--ink); }
.ln-s { scroll-margin-top: 90px; }
.ln-s h2 { margin: 34px 0 0; font-family: var(--f-display); font-weight: 700; font-size: 23px; line-height: 1.3; letter-spacing: -.02em; color: var(--ink); }
.ln-s h2 + p { margin-top: 10px; }
.ln-s p { margin: 14px 0 0; font-size: 16.5px; line-height: 1.75; color: var(--ink-2); }
.ln-main h3 { margin: 26px 0 0; font-family: var(--f-display); font-weight: 600; font-size: 18px; color: var(--ink); }
.ln-main code { padding: 2px 6px; border-radius: 5px; background: var(--bg-alt); font-family: var(--f-mono); font-size: 14px; color: var(--ink); }

.ln-code { margin-top: 20px; border-radius: 12px; overflow: hidden; background: #0F1322; border: 1px solid #262D45; }
.ln-code-bar { margin: 0; display: flex; align-items: center; gap: 12px; padding: 10px 16px; border-bottom: 1px solid #262D45; font-family: var(--f-mono); font-size: 12.5px; color: #99A0BA; white-space: nowrap; }
.ln-code-bar span { overflow: hidden; text-overflow: ellipsis; }
.ln-code-bar b { color: #F6A283; font-weight: 500; }
.ln-code pre { margin: 0; padding: 16px; overflow-x: auto; font-family: var(--f-mono); font-size: 13.5px; line-height: 1.7; color: #EEF0F7; }
.ln-code code { padding: 0; background: none; font: inherit; color: inherit; }
.ln-copy { margin-left: auto; padding: 4px 10px; border-radius: 6px; border: 1px solid #2A3150; background: transparent; cursor: pointer; font-family: var(--f-mono); font-size: 11.5px; color: #99A0BA; }
.ln-copy:hover { color: #fff; border-color: #4A5578; }
.ln-copy.is-done { color: #7BD88F; }
.ln-run { margin: 8px 0 0; font-size: 13.5px; color: var(--nh-muted); }
.ln-run a { font-weight: 600; color: var(--accent); }

.ln-table { width: 100%; margin-top: 18px; border-collapse: collapse; font-size: 15.5px; }
.ln-table th, .ln-table td { padding: 11px 14px; text-align: left; border: 1px solid var(--line); }
.ln-table th { background: var(--bg-alt); font-family: var(--f-display); font-weight: 600; font-size: 14.5px; color: var(--ink); }
.ln-table td { color: var(--ink-2); }
.ln-table td b { font-family: var(--f-mono); font-weight: 500; color: var(--ink); }

.ln-two { margin-top: 26px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.ln-two h3 { margin: 0 0 4px; }
.ln-two ul { margin: 0; padding: 0 0 0 18px; }
.ln-two li { margin-top: 8px; font-size: 15.5px; line-height: 1.65; color: var(--ink-2); }
.ln-two .ln-use li::marker { color: var(--nh-green); }
.ln-two .ln-avoid li::marker { color: var(--accent); }

.ln-faq { margin-top: 36px; }
.ln-faq h2, .ln-rel h2 { margin: 0 0 12px; font-family: var(--f-display); font-weight: 700; font-size: 23px; letter-spacing: -.02em; color: var(--ink); }
.ln-faq .nh-q + .nh-q { margin-top: 8px; }
.ln-rel { margin-top: 36px; }
.ln-rel ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 22px; }
.ln-rel a { display: flex; align-items: baseline; gap: 8px; padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 15.5px; color: var(--ink); text-decoration: none; }
.ln-rel a:hover { color: var(--accent); }
.ln-rel span { margin-left: auto; font-size: 12.5px; color: var(--nh-muted); }
.ln-prevnext { margin-top: 32px; display: flex; justify-content: space-between; gap: 16px; padding-top: 18px; border-top: 1px solid var(--line); }
.ln-prevnext a { display: flex; flex-direction: column; gap: 2px; font-size: 15.5px; color: var(--ink); text-decoration: none; }
.ln-prevnext a:hover { color: var(--accent); }
.ln-prevnext span { font-size: 12.5px; color: var(--nh-muted); }
.ln-prevnext .is-next { text-align: right; margin-left: auto; }
.ln-end { margin-top: 34px; padding: 18px 20px; border-radius: 12px; background: var(--bg-alt); display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; }
.ln-end p { margin: 0; flex: 1; min-width: 240px; font-size: 15px; line-height: 1.55; color: var(--ink-2); }
.ln-end b { color: var(--ink); }

/* ---------- the contents rail on the right ---------- */
.ln-side p { margin: 0 0 8px; font-family: var(--f-mono); font-size: 11.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--nh-muted); }
.ln-side ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.ln-side a { display: block; padding: 6px 12px; margin-left: -1px; border-left: 2px solid transparent; font-size: 13.5px; line-height: 1.45; color: var(--ink-2); text-decoration: none; }
.ln-side a:hover { color: var(--ink); }
.ln-side a.is-on { border-left-color: var(--accent); color: var(--accent); font-weight: 600; }

/* ---------- the hub ---------- */
.ln-hub-head { padding: 30px 0 0; }
.ln-hub-head h1 { margin: 8px 0 0; font-family: var(--f-display); font-weight: 700; font-size: clamp(32px, 3.4vw, 44px); line-height: 1.12; letter-spacing: -.03em; color: var(--ink); }
.ln-hub-head p { margin: 14px 0 0; max-width: 70ch; font-size: 17px; line-height: 1.7; color: var(--ink-2); }
.ln-search { position: relative; max-width: 460px; margin: 22px 0 0; }
.ln-search input { width: 100%; height: 46px; padding: 0 16px 0 42px; border-radius: 10px; border: 1px solid var(--line-2); background: #fff; font: inherit; font-size: 15px; color: var(--ink); }
.ln-search input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-tint); }
.ln-search .ln-ic { position: absolute; left: 14px; top: 14px; color: var(--nh-muted); }
.ln-count { margin: 10px 0 0; font-size: 13.5px; color: var(--nh-muted); }
.ln-index { margin-top: 26px; }
.ln-group { margin-top: 26px; }
.ln-group h2 { margin: 0; padding-bottom: 8px; border-bottom: 1px solid var(--line); display: flex; align-items: baseline; gap: 10px; font-family: var(--f-display); font-weight: 700; font-size: 19px; letter-spacing: -.02em; color: var(--ink); }
.ln-group h2 em { font-style: normal; margin-left: auto; font-family: var(--f-mono); font-size: 12.5px; font-weight: 500; color: var(--nh-muted); }
.ln-rows { list-style: none; margin: 0; padding: 0; }
.ln-row { display: grid; grid-template-columns: minmax(150px, 210px) minmax(0, 1fr) auto; gap: 18px; align-items: baseline; padding: 12px 10px; margin: 0 -10px; border-radius: 8px; color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--line); transition: background-color .15s; }
.ln-row:hover { background: var(--bg-alt); }
.ln-row b { font-family: var(--f-display); font-weight: 600; font-size: 16px; }
.ln-row b em { font-style: normal; margin-left: 8px; padding: 2px 7px; border-radius: 99px; background: #E8F5EE; font-size: 11px; font-weight: 600; color: var(--nh-green); }
.ln-row p { margin: 0; font-size: 14.5px; line-height: 1.5; color: var(--ink-2); }
.ln-row span { font-family: var(--f-mono); font-size: 12.5px; color: var(--nh-muted); white-space: nowrap; }
.ln-empty { margin: 20px 0 0; font-size: 15px; color: var(--ink-2); }
.ln-free { margin: 44px 0 0; padding: 22px 24px; border-radius: 14px; border: 1px solid var(--line); }
.ln-free h2 { margin: 0; font-family: var(--f-display); font-weight: 700; font-size: 20px; letter-spacing: -.02em; color: var(--ink); }
.ln-free > p { margin: 8px 0 0; font-size: 15.5px; line-height: 1.6; color: var(--ink-2); }
.ln-free ul { list-style: none; margin: 16px 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 24px; }
.ln-free li { display: flex; gap: 10px; font-size: 14.5px; line-height: 1.5; color: var(--ink-2); }
.ln-free li b { display: block; font-family: var(--f-display); font-weight: 600; font-size: 15px; color: var(--ink); }
.ln-free .ln-ic { flex: none; margin-top: 2px; color: var(--accent); }
.ln-free-go { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 10px; }

@media (max-width: 1200px) {
  .ln-doc { grid-template-columns: 240px minmax(0, 1fr); gap: 32px; }
  .ln-side { display: none; }
}
@media (max-width: 900px) {
  .ln-doc, .ln-doc--hub { grid-template-columns: minmax(0, 1fr); gap: 0; }
  /* phones: the guide keeps the breadcrumb and prev/next; the hub still lists everything */
  .ln-doc .ln-rail { display: none; }
  .ln-doc--hub .ln-rail { display: block; position: static; max-height: none; overflow: visible; padding: 18px 0 0; border-bottom: 1px solid var(--line); }
  .ln-doc--hub .ln-rail ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ln-rail-cta { display: none; }
  .ln-main { padding-top: 22px; }
  .ln-row { grid-template-columns: minmax(0, 1fr) auto; }
  .ln-row p { grid-column: 1 / -1; }
  .ln-two, .ln-rel ul, .ln-free ul { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  .ln-row, .ln-rail a.ln-rail-link { transition: none; }
}