/* Public, standalone learning page. No application shell or remote assets required. */
:root {
  color-scheme: light;
  --os-bg: #fff;
  --os-surface: #f7f8fa;
  --os-ink: #1d2129;
  --os-text: #4e5969;
  --os-muted: #667185;
  --os-line: #e5e6eb;
  --os-blue: #165dff;
  --os-blue-hover: #104bd6;
  --os-tint: #edf4ff;
  --os-blue-line: #cfdefe;
  --os-hero-glow: rgba(22, 93, 255, .045);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --os-bg: #0f1115;
    --os-surface: #171a21;
    --os-ink: #e6e9f0;
    --os-text: #b4bac6;
    --os-muted: #9aa4b6;
    --os-line: #2a2f3a;
    --os-blue: #8aaeff;
    --os-blue-hover: #adc7ff;
    --os-tint: #18243e;
    --os-blue-line: #334d7e;
    --os-hero-glow: rgba(90, 135, 255, .055);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 92px; }
body { margin: 0; background: var(--os-bg); color: var(--os-ink); font-size: 15px; line-height: 1.7; }
[hidden] { display: none !important; }
a { color: var(--os-blue); text-underline-offset: 4px; }
a:hover { text-decoration: underline; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, summary:focus-visible, textarea:focus-visible { outline: 3px solid var(--os-blue); outline-offset: 4px; }
button, textarea { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .7; }
button, a { touch-action: manipulation; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { line-height: 1.4; }
code, .os-file-tag, .os-code-label, .os-preview-path { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
code { font-size: .9em; color: var(--os-blue); overflow-wrap: anywhere; }
.os-skip { position: fixed; top: -100px; left: 12px; padding: 10px 18px; z-index: 5; background: var(--os-bg); border: 2px solid var(--os-blue); border-radius: 8px; }
.os-skip:focus { top: 12px; }
.os-header { border-bottom: 1px solid var(--os-line); background: var(--os-bg); }
.os-header-inner, .os-main, .os-footer { max-width: 1184px; margin: 0 auto; padding-left: 40px; padding-right: 40px; }
.os-header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 78px; }
.os-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--os-ink); text-decoration: none; font-size: 17px; font-weight: 700; white-space: nowrap; }
.os-brand:hover { text-decoration: none; }
.os-brand img { display: block; flex: none; border-radius: 9px; }
.os-brand-sub { font-size: 13px; font-weight: 500; color: var(--os-text); margin-left: 5px; }
.os-nav { display: flex; align-items: center; gap: 28px; font-size: 13px; }
.os-nav a { color: var(--os-text); text-decoration: none; }
.os-nav a:hover { color: var(--os-blue); }
.os-nav .os-nav-platform { padding: 7px 13px; color: var(--os-blue); background: var(--os-tint); border-radius: 7px; white-space: nowrap; }
.os-nav-platform span { margin-left: 8px; }
.os-hero { display: grid; grid-template-columns: 1.14fr 1fr; gap: 58px; align-items: center; padding: 76px 0 58px; }
.os-eyebrow { font-size: 11px; letter-spacing: .13em; color: var(--os-blue); font-weight: 650; margin-bottom: 14px; }
.os-hero .os-eyebrow { display: flex; align-items: center; gap: 9px; }
.os-dot { width: 6px; height: 6px; background: var(--os-blue); border-radius: 50%; box-shadow: 0 0 0 4px var(--os-tint); }
.os-hero h1 { font-size: clamp(42px, 4.9vw, 60px); letter-spacing: -.045em; font-weight: 750; line-height: 1.2; margin: 0 0 23px; }
.os-hero h1 > span { color: var(--os-blue); }
.os-hero-lead { font-size: 19px; font-weight: 550; line-height: 1.75; margin-bottom: 13px; }
.os-hero-description { color: var(--os-text); font-size: 14px; line-height: 1.95; max-width: 480px; }
.os-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 27px; }
.os-button { min-height: 44px; display: inline-flex; justify-content: center; align-items: center; gap: 17px; padding: 10px 19px; border: 1px solid var(--os-line); border-radius: 8px; background: var(--os-bg); color: var(--os-ink); font-size: 13px; font-weight: 600; text-decoration: none; transition: border-color .15s, background .15s, color .15s; }
.os-button:hover { border-color: var(--os-blue-line); background: var(--os-tint); color: var(--os-blue); text-decoration: none; }
.os-button-primary { background: var(--os-blue); border-color: var(--os-blue); color: var(--os-bg); }
.os-button-primary:hover { background: var(--os-blue-hover); border-color: var(--os-blue-hover); color: var(--os-bg); }
.os-hero-hint { color: var(--os-muted); font-size: 11px; margin-top: 13px; }
.os-source-preview { min-width: 0; background: var(--os-bg); border: 1px solid var(--os-line); border-radius: 14px; box-shadow: 0 16px 55px var(--os-hero-glow), 0 3px 8px rgba(0, 0, 0, .025); transform: translateY(3px); }
.os-preview-top { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; border-bottom: 1px solid var(--os-line); padding: 15px 21px; color: var(--os-text); font-size: 11px; }
.os-file-icon { font-size: 14px; color: var(--os-blue); font-weight: 650; margin-right: 1px; }
.os-preview-label { font-size: 8px; color: var(--os-muted); margin-left: auto; letter-spacing: .08em; }
.os-preview-body { padding: 22px 25px 24px; }
.os-preview-path { font-size: 11px; color: var(--os-muted); margin-bottom: 9px; }
.os-preview-body h2 { font-size: 21px; display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.os-code-label { font-size: 10px; font-weight: 500; color: var(--os-blue); background: var(--os-tint); border: 1px solid var(--os-blue-line); border-radius: 4px; padding: 3px 7px; }
.os-preview-caption { font-size: 11px; color: var(--os-muted); margin-top: 5px; }
.os-preview-steps { list-style: none; margin: 25px 0 22px; padding: 0; }
.os-preview-steps li { display: flex; gap: 15px; align-items: flex-start; margin-bottom: 17px; }
.os-preview-steps li:last-child { margin-bottom: 0; }
.os-preview-steps li > span { color: var(--os-blue); background: var(--os-tint); border-radius: 6px; width: 27px; height: 27px; flex: none; display: flex; align-items: center; justify-content: center; font-size: 10px; font-weight: 700; margin-top: 3px; }
.os-preview-steps strong { display: block; font-size: 13px; font-weight: 600; }
.os-preview-steps small { display: block; color: var(--os-text); font-size: 11px; margin-top: 2px; }
.os-text-link { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; font-size: 12px; font-weight: 600; }
.os-preview-bottom { display: flex; align-items: center; gap: 9px; padding: 11px 25px; background: var(--os-surface); border-top: 1px solid var(--os-line); border-radius: 0 0 14px 14px; color: var(--os-muted); font-size: 10px; }
.os-preview-bottom > span { font-size: 18px; line-height: 1; }
.os-facts { display: grid; grid-template-columns: 1fr 1fr 1.25fr 1.3fr; align-items: center; border-top: 1px solid var(--os-line); border-bottom: 1px solid var(--os-line); padding: 23px 0; }
.os-facts > div { border-right: 1px solid var(--os-line); padding-left: 27px; }
.os-facts > div:first-child { padding-left: 0; }
.os-facts strong { font-size: 34px; line-height: 1.25; letter-spacing: -.035em; font-weight: 700; }
.os-facts strong > span { font-size: 12px; color: var(--os-text); margin-left: 6px; font-weight: 500; }
.os-facts div > p { font-size: 11px; color: var(--os-text); margin-top: 4px; }
.os-facts .os-snapshot { color: var(--os-muted); font-size: 10px; line-height: 1.9; text-align: right; }
.os-snapshot a { text-decoration: none; color: var(--os-muted); }
.os-snapshot a:hover { color: var(--os-blue); }
.os-section { margin-top: 68px; }
.os-section-head { margin-bottom: 26px; }
.os-section-head .os-eyebrow { margin-bottom: 7px; }
.os-section-head h2 { font-size: 27px; letter-spacing: -.025em; font-weight: 650; }
.os-section-head > p:last-child:not(.os-eyebrow) { margin-top: 10px; font-size: 13px; color: var(--os-text); }
.os-section-head-row { display: flex; align-items: end; justify-content: space-between; gap: 20px; }
.os-section-head-row > a { flex: none; margin-bottom: 5px; }
.os-content-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.os-content-grid article { padding: 3px 0 6px 18px; border-left: 2px solid var(--os-blue-line); }
.os-file-tag { display: inline-block; color: var(--os-muted); font-size: 10px; }
.os-content-grid h3 { font-size: 15px; margin-top: 9px; margin-bottom: 8px; font-weight: 600; }
.os-content-grid p { font-size: 12px; color: var(--os-text); line-height: 1.85; }
.os-note { margin-top: 17px; color: var(--os-muted); font-size: 11px; }
.os-note a { color: inherit; }
.os-category-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.os-category { display: flex; flex-direction: column; border: 1px solid var(--os-line); border-radius: 10px; padding: 20px; color: var(--os-ink); text-decoration: none; transition: border-color .15s, background .15s; }
.os-category:hover { border-color: var(--os-blue-line); background: var(--os-tint); text-decoration: none; }
.os-category-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--os-blue); font-size: 11px; }
.os-category-count { font-size: 25px; font-weight: 600; letter-spacing: -.025em; }
.os-category h3 { font-size: 15px; font-weight: 600; margin-top: 16px; }
.os-category p { font-size: 12px; line-height: 1.9; color: var(--os-text); margin-top: 8px; margin-bottom: 22px; }
.os-category-link { display: flex; align-items: center; justify-content: space-between; color: var(--os-blue); font-size: 11px; font-weight: 600; margin-top: auto; }
.os-experts { display: flex; justify-content: space-between; align-items: center; gap: 24px; margin-top: 15px; border: 1px solid var(--os-line); border-radius: 10px; padding: 20px 24px; background: var(--os-surface); color: var(--os-ink); text-decoration: none; }
.os-experts:hover { border-color: var(--os-blue-line); text-decoration: none; }
.os-experts h3 { font-size: 15px; margin: 5px 0; font-weight: 600; }
.os-experts p { font-size: 12px; color: var(--os-text); }
.os-experts > .os-text-link { color: var(--os-blue); flex: none; }
.os-topic .os-section-head > div > p:last-child { margin-top: 10px; color: var(--os-text); font-size: 13px; }
.os-topic-directory { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; list-style: none; margin: 0; padding: 0; }
.os-topic-directory > li { min-width: 0; }
.os-topic-skill { display: flex; flex-direction: column; height: 100%; padding: 20px; border: 1px solid var(--os-line); border-radius: 10px; color: var(--os-ink); text-decoration: none; transition: border-color .15s, background .15s; }
.os-topic-skill:hover { border-color: var(--os-blue-line); background: var(--os-tint); text-decoration: none; }
.os-topic-skill .os-reading-number { margin-bottom: 8px; }
.os-topic-skill h3 { font-size: 15px; font-weight: 600; }
.os-topic-skill p { margin: 8px 0 16px; color: var(--os-text); font-size: 12px; line-height: 1.85; }
.os-topic-workflow { margin-top: 30px; }
.os-topic-workflow > h3 { font-size: 16px; font-weight: 600; margin-bottom: 18px; }
.os-topic-workflow > ol { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; list-style: none; padding: 0; margin: 0; }
.os-topic-workflow li { display: flex; align-items: flex-start; gap: 12px; min-width: 0; }
.os-topic-workflow strong { display: block; font-size: 13px; font-weight: 600; margin-top: 3px; }
.os-topic-workflow p { margin-top: 7px; font-size: 12px; color: var(--os-text); line-height: 1.85; }
.os-topic-demo { display: grid; grid-template-columns: 1.3fr 1fr; gap: 38px; margin-top: 28px; padding: 27px 30px; border: 1px solid var(--os-line); border-radius: 10px; background: var(--os-surface); }
.os-topic-demo .os-eyebrow { margin-bottom: 7px; }
.os-topic-demo h3 { font-size: 20px; font-weight: 600; }
.os-topic-demo > div > p:last-child { margin-top: 11px; color: var(--os-text); font-size: 12px; line-height: 1.9; }
.os-topic-agenda { list-style: none; padding: 0; margin: 0; }
.os-topic-agenda li { display: flex; gap: 16px; padding: 9px 0; border-bottom: 1px solid var(--os-line); }
.os-topic-agenda li:first-child { padding-top: 0; }
.os-topic-agenda li:last-child { border-bottom: 0; padding-bottom: 0; }
.os-topic-agenda span { flex: none; min-width: 74px; color: var(--os-blue); font-size: 11px; font-weight: 600; }
.os-topic-agenda p { font-size: 12px; color: var(--os-text); line-height: 1.85; }
.os-reading-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.os-reading-card { display: flex; flex-direction: column; border-top: 2px solid var(--os-line); padding-top: 17px; }
.os-reading-number { font-size: 10px; letter-spacing: .08em; color: var(--os-muted); margin-bottom: 12px; }
.os-reading-card h3 { font-size: 16px; font-weight: 600; }
.os-reading-card > p:not(.os-reading-number) { margin-top: 10px; margin-bottom: 19px; font-size: 12px; line-height: 1.9; color: var(--os-text); }
.os-reading-card > a { margin-top: auto; }
.os-learning { border-radius: 12px; border: 1px solid var(--os-line); padding: 35px 38px 25px; }
.os-learning-steps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 27px 40px; list-style: none; margin: 0; padding: 0; }
.os-learning-steps li { display: flex; align-items: flex-start; gap: 14px; }
.os-step-number { flex: none; width: 29px; height: 29px; display: inline-flex; align-items: center; justify-content: center; background: var(--os-tint); color: var(--os-blue); border-radius: 50%; font-size: 12px; font-weight: 700; }
.os-learning-steps h3 { font-size: 14px; font-weight: 600; margin: 3px 0 7px; }
.os-learning-steps p { color: var(--os-text); font-size: 12px; line-height: 1.9; }
.os-deploy-note { margin-top: 28px; padding-top: 19px; border-top: 1px solid var(--os-line); color: var(--os-muted); font-size: 11px; }
.os-faq { display: grid; grid-template-columns: .75fr 1.4fr; gap: 48px; }
.os-faq-list details { border-bottom: 1px solid var(--os-line); }
.os-faq-list details:first-child { border-top: 1px solid var(--os-line); }
.os-faq-list summary { cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 20px; list-style: none; font-size: 13px; font-weight: 550; padding: 19px 0; }
.os-faq-list summary::-webkit-details-marker { display: none; }
.os-faq-list summary > span { font-size: 20px; font-weight: 400; color: var(--os-muted); transition: transform .15s; }
.os-faq-list details[open] summary > span { transform: rotate(45deg); }
.os-faq-list details > div { font-size: 12px; line-height: 1.95; color: var(--os-text); padding: 0 25px 21px 0; }
.os-share { margin-top: 70px; display: grid; grid-template-columns: 1.25fr 1fr; gap: 45px; align-items: center; padding: 37px 40px; border: 1px solid var(--os-blue-line); border-radius: 12px; background: var(--os-tint); }
.os-share .os-eyebrow { margin-bottom: 8px; }
.os-share h2 { font-size: 25px; font-weight: 650; letter-spacing: -.025em; }
.os-share > div > p:last-child:not(.os-eyebrow) { margin-top: 12px; color: var(--os-text); font-size: 12px; line-height: 1.9; }
.os-share-actions { display: flex; flex-direction: column; align-items: stretch; max-width: 290px; width: 100%; justify-self: end; gap: 10px; }
.os-share-actions > .os-button { width: 100%; }
#share-status { font-size: 11px; line-height: 1.6; color: var(--os-text); min-height: 18px; }
#share-status:empty { display: none; }
#share-fallback label { display: block; font-size: 11px; margin-bottom: 6px; color: var(--os-text); }
#share-text { width: 100%; resize: vertical; padding: 10px; font-size: 12px; line-height: 1.7; border: 1px solid var(--os-blue-line); border-radius: 7px; color: var(--os-text); background: var(--os-bg); }
.os-footer { display: flex; justify-content: space-between; gap: 30px; padding-top: 35px; padding-bottom: 32px; color: var(--os-muted); font-size: 10px; line-height: 1.9; }
.os-footer > div > span { color: var(--os-text); font-size: 11px; font-weight: 600; }
.os-footer > p { text-align: right; }
.os-footer a { color: inherit; }
@media (max-width: 960px) {
  .os-header-inner, .os-main, .os-footer { padding-left: 28px; padding-right: 28px; }
  .os-hero { gap: 30px; padding-top: 55px; }
  .os-brand-sub { display: none; }
  .os-nav { gap: 18px; }
  .os-preview-label { display: none; }
  .os-preview-body { padding: 20px; }
  .os-preview-top { padding-left: 20px; padding-right: 20px; }
  .os-facts { grid-template-columns: 1fr 1fr 1.45fr 1.25fr; }
  .os-facts > div { padding-left: 19px; }
  .os-category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .os-category { padding: 23px; }
  .os-category h3 { margin-top: 9px; }
  .os-category p { margin-bottom: 17px; }
  .os-topic-workflow > ol { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .os-topic-demo { gap: 24px; padding: 25px; }
  .os-faq { grid-template-columns: .85fr 1.35fr; gap: 30px; }
  .os-share { gap: 26px; padding: 30px; }
  .os-share h2 { font-size: 22px; }
}
@media (max-width: 700px) {
  html { scroll-padding-top: 24px; }
  .os-header-inner, .os-main, .os-footer { padding-left: 22px; padding-right: 22px; }
  .os-header-inner { min-height: 67px; gap: 12px; }
  .os-brand { font-size: 16px; }
  .os-brand img { width: 28px; height: 28px; }
  .os-nav > a:not(.os-nav-platform) { display: none; }
  .os-nav .os-nav-platform { padding: 7px 10px; font-size: 11px; }
  .os-hero { grid-template-columns: 1fr; gap: 33px; padding: 43px 0 35px; }
  .os-hero h1 { font-size: 49px; margin-bottom: 20px; }
  .os-hero-lead { font-size: 18px; }
  .os-hero-description { font-size: 13px; max-width: none; }
  .os-actions { margin-top: 23px; }
  .os-actions > a { flex: 1; padding-left: 12px; padding-right: 12px; gap: 10px; }
  .os-source-preview { transform: none; }
  .os-preview-label { display: inline; }
  .os-preview-body { padding: 23px; }
  .os-preview-steps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 15px; }
  .os-preview-steps li { gap: 10px; margin: 0; }
  .os-preview-steps strong { font-size: 12px; }
  .os-preview-steps small { font-size: 10px; }
  .os-facts { grid-template-columns: 1fr 1fr 1.6fr; padding: 21px 0 15px; row-gap: 18px; }
  .os-facts > div { padding-left: 18px; }
  .os-facts > div:nth-child(3) { border-right: 0; }
  .os-facts strong { font-size: 30px; }
  .os-facts div > p { font-size: 10px; }
  .os-facts .os-snapshot { grid-column: 1 / -1; text-align: left; font-size: 9px; }
  .os-snapshot br { display: none; }
  .os-snapshot a { margin-left: 8px; }
  .os-section { margin-top: 46px; }
  .os-section-head { margin-bottom: 21px; }
  .os-section-head h2 { font-size: 23px; }
  .os-content-grid { grid-template-columns: 1fr; gap: 23px; }
  .os-content-grid article { padding-top: 0; padding-bottom: 0; }
  .os-content-grid h3 { margin-top: 5px; margin-bottom: 5px; }
  .os-content-grid p { max-width: 480px; }
  .os-section-head-row { display: block; }
  .os-section-head-row > a { margin-top: 12px; }
  .os-category-grid { gap: 12px; }
  .os-category { padding: 16px; }
  .os-category h3 { font-size: 14px; }
  .os-category p { font-size: 11px; }
  .os-experts { flex-direction: column; align-items: flex-start; gap: 15px; padding: 20px; }
  .os-topic-directory { grid-template-columns: 1fr; gap: 12px; }
  .os-topic-skill { padding: 18px 20px; }
  .os-topic-skill p { margin-bottom: 12px; }
  .os-topic-workflow > ol { grid-template-columns: 1fr; gap: 20px; }
  .os-topic-demo { grid-template-columns: 1fr; gap: 22px; padding: 22px 20px; }
  .os-topic-demo h3 { font-size: 18px; }
  .os-reading-grid { grid-template-columns: 1fr; gap: 28px; }
  .os-reading-number { margin-bottom: 8px; }
  .os-reading-card > p:not(.os-reading-number) { margin-top: 7px; margin-bottom: 12px; }
  .os-learning { padding: 26px 21px 23px; }
  .os-learning-steps { grid-template-columns: 1fr; gap: 25px; }
  .os-learning-steps h3 { font-size: 13px; }
  .os-deploy-note { line-height: 1.9; }
  .os-faq { grid-template-columns: 1fr; gap: 0; }
  .os-faq-list summary { font-size: 12px; }
  .os-share { grid-template-columns: 1fr; gap: 25px; padding: 27px 22px; margin-top: 48px; }
  .os-share h2 { font-size: 21px; }
  .os-share-actions { max-width: none; }
  .os-footer { display: block; padding-top: 26px; }
  .os-footer > p { text-align: left; margin-top: 14px; }
}
@media (max-width: 390px) {
  .os-header-inner, .os-main, .os-footer { padding-left: 17px; padding-right: 17px; }
  .os-hero h1 { font-size: 43px; }
  .os-hero-lead { font-size: 16px; }
  .os-preview-steps { grid-template-columns: 1fr; gap: 16px; }
  .os-preview-top { font-size: 10px; }
  .os-preview-label { display: none; }
  .os-category-grid { grid-template-columns: 1fr; }
  .os-category { padding: 19px; }
  .os-facts > div { padding-left: 12px; }
  .os-facts strong { font-size: 26px; }
  .os-facts div > p { font-size: 9px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}