/* LiteShop Learn — edu.liteshop.app. Brand tokens match landing/index.html. */
:root {
  --ink: #1A1A1A;
  --ink-soft: #3D3D3D;
  --muted: #6B6B6B;
  --line: #E0E0E0;
  --canvas: #F2F2F2;
  --soft: #F7F7F7;
  --bg: #FFFFFF;
  --surface: #FFFFFF;
  --blue: #006AFF;
  --blue-dark: #0055CC;
  --blue-tint: #E5F0FF;
  --link: #0055CC;
  --green: #00A651;
  --green-tint: #E6F6EE;
  --amber: #B25E00;
  --amber-tint: #FFF4E5;
  --red: #C62828;
  --red-tint: #FDECEC;
  --logo-bg: #1A1A1A;
  --logo-fg: #FFFFFF;
  --radius: 8px;
  --top: 60px;
  --side: 272px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #F2F2F2; --ink-soft: #D6D6D6; --muted: #A3A3A3; --line: #2E2E2E;
    --canvas: #1A1A1A; --soft: #1C1C1C; --bg: #111111; --surface: #171717;
    --blue-tint: #0F2747; --link: #6AA8FF; --green-tint: #0F2A1C; --amber-tint: #2E2210;
    --amber: #F0A54A; --red-tint: #2E1414; --red: #FF8A80;
    --logo-bg: #F2F2F2; --logo-fg: #111111; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ink: #F2F2F2; --ink-soft: #D6D6D6; --muted: #A3A3A3; --line: #2E2E2E;
  --canvas: #1A1A1A; --soft: #1C1C1C; --bg: #111111; --surface: #171717;
  --blue-tint: #0F2747; --link: #6AA8FF; --green-tint: #0F2A1C; --amber-tint: #2E2210;
  --amber: #F0A54A; --red-tint: #2E1414; --red: #FF8A80;
  --logo-bg: #F2F2F2; --logo-fg: #111111; color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top) + 12px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: Inter, "Noto Sans Myanmar", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 17px; line-height: 1.6; -webkit-font-smoothing: antialiased;
}
body.lang-my, [lang="my"] { font-family: "Noto Sans Myanmar", Inter, "Myanmar Text", Padauk, system-ui, sans-serif; line-height: 1.85; }
body.lang-my { font-size: 16px; overflow-wrap: anywhere; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
svg { display: block; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--blue); color: #fff; padding: 8px 12px; border-radius: var(--radius); z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 40px; padding: 0 16px;
  border-radius: var(--radius); font-weight: 600; font-size: 15px; border: 1px solid transparent; white-space: nowrap; cursor: pointer; }
.btn:hover { text-decoration: none; }
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); }
.btn-outline { background: var(--surface); border-color: var(--line); color: var(--ink); }
.btn-outline:hover { border-color: var(--ink); }
.btn-lg { height: 52px; padding: 0 28px; font-size: 18px; min-width: 160px; }
.icon-btn { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: var(--radius);
  border: 0; background: transparent; color: var(--ink); cursor: pointer; flex: none; }
.icon-btn:hover { background: var(--canvas); }
.icon-btn svg { width: 22px; height: 22px; }
.link-btn { display: inline-flex; align-items: center; gap: 6px; border: 0; background: none; color: var(--muted); font: inherit; font-size: 14px; cursor: pointer; padding: 6px 0; }
.link-btn svg { width: 18px; height: 18px; }
.link-btn:hover { color: var(--ink); }

/* Top bar */
.topbar { position: sticky; top: 0; z-index: 30; height: var(--top); background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(12px); border-bottom: 1px solid var(--line); }
.topbar-in { height: 100%; display: flex; align-items: center; gap: 12px; padding: 0 16px; max-width: 1400px; margin: 0 auto; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; font-size: 18px; letter-spacing: -.3px; flex: none; }
.brand:hover { text-decoration: none; }
.brand svg { width: 32px; height: 32px; color: var(--logo-bg); }
.brand b { font-weight: 600; color: var(--blue); }
.brand.small svg { width: 24px; height: 24px; }
.menu-btn { display: none; }
.search { position: relative; flex: 1; max-width: 520px; margin-left: 12px; }
.search-box { display: flex; align-items: center; gap: 8px; height: 40px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--soft); padding: 0 12px; color: var(--muted); cursor: text; }
.search-box:focus-within { border-color: var(--blue); background: var(--surface); }
.search-box svg { width: 18px; height: 18px; flex: none; }
.search-box input { border: 0; outline: 0; background: transparent; color: var(--ink); font: inherit; font-size: 15px; width: 100%; min-width: 0; }
.search-box.big { height: 52px; font-size: 17px; background: var(--surface); }
.search-results { position: absolute; top: 46px; left: 0; right: 0; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: 0 16px 40px -12px rgba(0,0,0,.25); max-height: min(70vh, 520px); overflow: auto; z-index: 40; padding: 6px; }
.search-results a { display: block; padding: 10px 12px; border-radius: 6px; color: var(--ink); }
.search-results a:hover, .search-results a.sel { background: var(--blue-tint); text-decoration: none; }
.search-results small { display: block; color: var(--muted); font-size: 12px; }
.search-results strong { display: block; font-size: 15px; }
.search-results span { display: block; color: var(--ink-soft); font-size: 13px; line-height: 1.45; max-height: 2.9em; overflow: hidden; }
.search-results mark { background: #FFE58A; color: #1A1A1A; border-radius: 2px; }
.search-results .empty { padding: 12px; color: var(--muted); font-size: 14px; }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 4px; flex: none; }
.lang-link { display: inline-flex; align-items: center; gap: 6px; height: 40px; padding: 0 10px; border-radius: var(--radius); color: var(--ink); font-weight: 600; font-size: 15px; }
.lang-link svg { width: 18px; height: 18px; }
.lang-link:hover { background: var(--canvas); text-decoration: none; }
.open-btn { margin-left: 6px; }

/* Layout */
.layout { display: grid; grid-template-columns: var(--side) minmax(0, 1fr); max-width: 1400px; margin: 0 auto; }
.sidebar { position: sticky; top: var(--top); align-self: start; height: calc(100vh - var(--top)); overflow: auto; padding: 20px 12px 40px 16px;
  border-right: 1px solid var(--line); font-size: 15px; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar a { display: block; padding: 6px 10px; border-radius: 6px; color: var(--ink-soft); }
.sidebar a:hover { background: var(--canvas); text-decoration: none; color: var(--ink); }
.sidebar li.active > a, .nav-home.active { background: var(--blue-tint); color: var(--ink); font-weight: 600; }
.nav-home { font-weight: 600; margin-bottom: 6px; }
.nav-title { margin: 18px 10px 6px; font-size: 12px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.lang-my .nav-title { text-transform: none; letter-spacing: 0; font-size: 13px; }
.toc { margin: 4px 0 8px 10px !important; border-left: 1px solid var(--line); }
.toc a { font-size: 14px; padding: 4px 10px; color: var(--muted); }
.scrim { display: none; }

.content { padding: 24px 40px 64px; min-width: 0; max-width: 860px; }
.crumbs { display: flex; flex-wrap: wrap; gap: 6px; font-size: 14px; color: var(--muted); margin-bottom: 12px; }
.crumbs a { color: var(--muted); }
.doc-head h1, .hero h1 { font-size: clamp(30px, 4.2vw, 42px); line-height: 1.15; letter-spacing: -1px; margin: 0 0 10px; font-weight: 800; }
.lang-my .doc-head h1, .lang-my .hero h1 { letter-spacing: 0; line-height: 1.5; font-size: clamp(26px, 3.6vw, 36px); }
.lead { font-size: 19px; color: var(--ink-soft); margin: 0 0 16px; }
.lang-my .lead { font-size: 17px; }
.mini-toc { display: none; border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; margin: 8px 0 8px; background: var(--soft); }
.mini-toc summary { cursor: pointer; font-weight: 600; }
.mini-toc ul { margin: 8px 0 0; padding-left: 18px; }
.mini-toc li { margin: 4px 0; }

.doc h2 { position: relative; font-size: 25px; line-height: 1.3; margin: 44px 0 10px; padding-top: 20px; border-top: 1px solid var(--line); letter-spacing: -.3px; }
.lang-my .doc h2 { font-size: 22px; line-height: 1.6; letter-spacing: 0; }
.doc h2 .anchor { position: absolute; left: -24px; color: var(--muted); opacity: 0; font-weight: 400; }
.doc h2:hover .anchor, .doc h2 .anchor:focus { opacity: 1; text-decoration: none; }
.doc h3 { font-size: 19px; margin: 26px 0 8px; }
.doc p, .doc li { color: var(--ink); }
.doc ul, .doc ol { padding-left: 24px; }
.doc li { margin: 6px 0; }
ol.steps { list-style: none; counter-reset: step; padding-left: 0; }
ol.steps > li { counter-increment: step; position: relative; padding-left: 44px; min-height: 30px; margin: 12px 0; }
ol.steps > li::before { content: counter(step); position: absolute; left: 0; top: 1px; width: 30px; height: 30px; border-radius: 50%;
  background: var(--blue); color: #fff; font-weight: 700; font-size: 15px; display: flex; align-items: center; justify-content: center; font-family: Inter, system-ui, sans-serif; }
.lang-my ol.steps > li::before { top: 4px; }
code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .9em; background: var(--canvas); padding: 1px 5px; border-radius: 4px; }
strong { font-weight: 700; }
.shot { margin: 16px 0 20px; }
.shot img { display: block; width: 100%; max-width: 340px; border: 1px solid var(--line); border-radius: 12px; background: var(--soft); }
.shot figcaption { font-size: 14px; color: var(--muted); margin-top: 6px; max-width: 340px; }
.callout { border-radius: var(--radius); padding: 12px 16px; margin: 16px 0; border-left: 4px solid var(--blue); background: var(--blue-tint); }
.callout p { margin: 0; }
.callout .callout-title { font-weight: 700; font-size: 14px; text-transform: uppercase; letter-spacing: .04em; margin-bottom: 2px; }
.lang-my .callout .callout-title { text-transform: none; letter-spacing: 0; }
.callout.tip { border-color: var(--green); background: var(--green-tint); }
.callout.warning { border-color: var(--amber); background: var(--amber-tint); }
.callout.warning .callout-title { color: var(--amber); }
blockquote { margin: 16px 0; padding: 4px 16px; border-left: 3px solid var(--line); color: var(--ink-soft); }
.table-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--soft); }
.doc-tools { margin-top: 40px; }
.prevnext { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; }
.pn { display: block; border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; color: var(--ink); }
.pn:hover { border-color: var(--blue); text-decoration: none; }
.pn small { display: block; color: var(--muted); font-size: 13px; }
.pn span { font-weight: 600; }
.pn.next { text-align: right; }

/* Home */
.hero { padding: 24px 0 8px; }
.hero-search { max-width: 560px; margin: 8px 0 8px; }
.home-group h2 { font-size: 20px; margin: 36px 0 12px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.card { display: flex; flex-direction: column; gap: 4px; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px;
  color: var(--ink); background: var(--surface); }
.card:hover { border-color: var(--blue); text-decoration: none; }
.card strong { font-size: 16px; }
.card span { color: var(--muted); font-size: 14px; line-height: 1.5; }
.cards.start .card { background: var(--blue-tint); border-color: transparent; }
.cards.start .card:hover { border-color: var(--blue); }

/* Chooser / 404 */
.chooser { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--soft); }
.choose { text-align: center; padding: 32px 16px; max-width: 560px; }
.choose .brand { margin-bottom: 24px; }
.choose h1 { font-size: clamp(26px, 5vw, 36px); line-height: 1.35; margin: 0 0 12px; }
.choose h1 span { font-family: "Noto Sans Myanmar", sans-serif; font-weight: 700; }
.choose p { color: var(--ink-soft); }
.choose-btns { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 24px; }

.footer { border-top: 1px solid var(--line); background: var(--soft); }
.footer-in { max-width: 1400px; margin: 0 auto; padding: 24px 16px 40px; font-size: 14px; color: var(--muted); }
.footer-in p { margin: 8px 0 0; }

/* Tablet / phone */
@media (max-width: 1100px) {
  .open-btn span { display: none; }
  .open-btn { padding: 0 10px; }
}
@media (max-width: 900px) {
  :root { --top: 56px; }
  .layout { display: block; }
  .menu-btn { display: inline-flex; margin-left: -8px; }
  .sidebar { position: fixed; z-index: 50; top: 0; left: 0; bottom: 0; height: 100vh; width: min(320px, 86vw); background: var(--surface);
    transform: translateX(-102%); transition: transform .2s ease; box-shadow: 0 0 40px rgba(0,0,0,.25); padding-top: 16px; }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim { display: block; position: fixed; inset: 0; z-index: 45; background: rgba(0,0,0,.35); }
  .content { padding: 16px 16px 48px; }
  .mini-toc { display: block; }
  .doc h2 .anchor { display: none; }
}
@media (max-width: 640px) {
  .topbar-in { gap: 6px; padding: 0 12px; flex-wrap: nowrap; }
  .brand span { display: none; }
  .search { margin-left: 4px; }
  .search-box { padding: 0 10px; }
  .lang-link span { display: none; }
  .lang-link { padding: 0 8px; }
  .theme-btn { display: none; }
  .open-btn { display: none; }
  body.search-open .search { position: fixed; left: 8px; right: 8px; top: 8px; max-width: none; margin: 0; z-index: 60; }
  .search-results { position: fixed; top: 64px; left: 8px; right: 8px; max-height: calc(100vh - 80px); }
  .doc h2 { font-size: 22px; margin-top: 36px; }
  .lang-my .doc h2 { font-size: 20px; }
  .lead { font-size: 17px; }
  .prevnext { grid-template-columns: 1fr; }
  .pn.next { text-align: left; }
  .cards { grid-template-columns: 1fr; }
  .shot img { max-width: 300px; }
}

/* Print */
@media print {
  :root { --ink: #000; --bg: #fff; --surface: #fff; }
  .topbar, .sidebar, .scrim, .footer, .doc-tools, .prevnext, .crumbs, .mini-toc, .skip, .doc h2 .anchor { display: none !important; }
  .layout { display: block; }
  .content { padding: 0; max-width: none; }
  body { font-size: 12pt; background: #fff; color: #000; }
  a { color: #000; }
  .doc h2 { break-after: avoid; border-top: 0; margin-top: 18pt; }
  .shot { break-inside: avoid; }
  .shot img { max-width: 55mm; }
  .callout { break-inside: avoid; background: none !important; border: 1px solid #999; }
  ol.steps > li::before { background: #000; }
}
@media (prefers-reduced-motion: reduce) { .sidebar { transition: none; } }