:root {
  --paper: #f4f0e8;
  --paper-2: #e9e4da;
  --ink: #17202b;
  --muted: #66717d;
  --line: #c8c2b6;
  --blue: #235fd1;
  --blue-dark: #143978;
  --orange: #dc7628;
  --white: #fffdfa;
  --shadow: 0 18px 44px rgba(31, 40, 49, .1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
p { margin: 0 0 16px; }

.atlas-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(244, 240, 232, .94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.atlas-header-inner {
  max-width: 1240px;
  min-height: 72px;
  margin: auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  gap: 34px;
}
.atlas-mark { display: flex; align-items: center; gap: 11px; font-weight: 800; font-size: 18px; }
.atlas-mark-dot {
  width: 16px;
  height: 16px;
  border: 4px solid var(--blue);
  border-radius: 50%;
  display: block;
  box-shadow: 7px -5px 0 -3px var(--orange);
}
.atlas-nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.atlas-nav a { padding: 9px 12px; color: #4f5964; font-size: 14px; border-bottom: 2px solid transparent; }
.atlas-nav a:hover, .atlas-nav a.is-active { color: var(--blue-dark); border-color: var(--blue); }
.atlas-menu-button { display: none; border: 1px solid var(--line); background: var(--white); color: var(--ink); padding: 8px 12px; border-radius: 3px; font: inherit; }
.atlas-page { max-width: 1240px; margin: auto; padding: 0 28px 70px; }

.atlas-hero {
  min-height: 600px;
  padding: 70px 0 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 1.08fr);
  gap: 56px;
  align-items: center;
}
.atlas-hero-copy { max-width: 560px; }
.atlas-kicker, .atlas-intro > span, .atlas-section-heading > span, .atlas-article-meta span, .atlas-origin-copy > span {
  color: var(--orange);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}
.atlas-hero h1 { font-size: 48px; line-height: 1.14; margin: 18px 0 22px; max-width: 560px; }
.atlas-hero-copy > p { font-size: 18px; color: #4d5863; max-width: 530px; }
.atlas-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0; }
.atlas-button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 10px 19px; border: 1px solid var(--blue-dark); border-radius: 4px; font-weight: 700; font-size: 14px; }
.atlas-button-primary { background: var(--blue-dark); color: #fff; }
.atlas-button-secondary { background: transparent; color: var(--blue-dark); }
.atlas-button:hover { transform: translateY(-1px); box-shadow: 0 7px 18px rgba(20, 57, 120, .15); }
.atlas-hero-facts { display: flex; gap: 22px; border-top: 1px solid var(--line); padding-top: 17px; color: var(--muted); font-size: 13px; }
.atlas-hero-facts b { display: block; color: var(--blue-dark); font-size: 21px; line-height: 1.1; }
.atlas-hero-visual { margin: 0; background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow); padding: 8px; transform: rotate(1.2deg); }
.atlas-hero-visual img { display: block; width: 100%; height: auto; }

.atlas-workbench, .atlas-matrix, .atlas-platforms, .atlas-articles, .atlas-faq { border-top: 1px solid var(--line); padding: 62px 0; }
.atlas-section-heading { max-width: 700px; margin-bottom: 28px; }
.atlas-section-heading h2 { margin: 8px 0 9px; font-size: 31px; line-height: 1.25; }
.atlas-section-heading p { color: var(--muted); }
.atlas-workbench-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.atlas-workbench-grid a { min-height: 168px; padding: 22px 19px; border-right: 1px solid var(--line); display: flex; flex-direction: column; gap: 8px; }
.atlas-workbench-grid a:last-child { border-right: 0; }
.atlas-workbench-grid a:hover { background: #e8effb; }
.atlas-workbench-grid strong { font-size: 17px; color: var(--blue-dark); }
.atlas-workbench-grid span { color: var(--muted); font-size: 14px; }
.atlas-workbench-grid em { margin-top: auto; color: var(--orange); font-style: normal; font-size: 13px; font-weight: 700; }

.atlas-region-table, .atlas-platform-table { border-top: 2px solid var(--ink); border-bottom: 1px solid var(--ink); }
.atlas-region-head, .atlas-region-row, .atlas-platform-head, .atlas-platform-row {
  display: grid;
  grid-template-columns: 1.1fr 1.8fr .7fr;
  gap: 20px;
  align-items: center;
  padding: 18px 16px;
  border-bottom: 1px solid var(--line);
}
.atlas-region-head, .atlas-platform-head { font-size: 11px; font-weight: 800; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; background: var(--paper-2); }
.atlas-region-row:last-child, .atlas-platform-row:last-child { border-bottom: 0; }
.atlas-region-row strong, .atlas-platform-row strong { color: var(--blue-dark); }
.atlas-region-row a, .atlas-platform-row a { color: var(--orange); font-weight: 700; font-size: 13px; text-align: right; }

.atlas-origin { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; padding: 66px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.atlas-origin-copy h2 { font-size: 32px; line-height: 1.25; margin: 10px 0 15px; }
.atlas-origin-copy p { color: #4d5863; max-width: 560px; }
.atlas-text-link { color: var(--blue); font-weight: 800; font-size: 14px; border-bottom: 1px solid currentColor; padding-bottom: 3px; }
.atlas-origin-list { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--ink); align-content: start; }
.atlas-origin-list div { min-height: 100px; padding: 19px 14px; border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); }
.atlas-origin-list div:nth-child(even) { border-right: 0; }
.atlas-origin-list b { display: block; color: var(--blue-dark); font-size: 17px; }
.atlas-origin-list span { color: var(--muted); font-size: 13px; }

.atlas-article-list { border-top: 2px solid var(--ink); }
.atlas-article-row { display: grid; grid-template-columns: 130px minmax(0, 1fr) 1.2fr; gap: 22px; padding: 22px 0; border-bottom: 1px solid var(--line); align-items: start; }
.atlas-article-row h3 { font-size: 18px; line-height: 1.4; margin: 0; color: var(--blue-dark); }
.atlas-article-row h3 a:hover { color: var(--orange); }
.atlas-article-row p { color: var(--muted); font-size: 14px; margin: 0; }
.atlas-article-meta { display: flex; flex-direction: column; gap: 4px; color: var(--muted); font-size: 12px; }
.atlas-article-meta time { font-variant-numeric: tabular-nums; }
.atlas-articles > .atlas-text-link { display: inline-block; margin-top: 24px; }
.atlas-faq-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.atlas-faq-grid details, .atlas-help-groups details { background: var(--white); border: 1px solid var(--line); padding: 15px 17px; }
.atlas-faq-grid summary, .atlas-help-groups summary { cursor: pointer; font-weight: 700; color: var(--blue-dark); }
.atlas-faq-grid p, .atlas-help-groups p { color: var(--muted); font-size: 14px; margin: 10px 0 0; }

.atlas-footer { border-top: 1px solid var(--ink); background: #e8e2d7; padding: 40px max(28px, calc((100% - 1184px) / 2)) 22px; }
.atlas-footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 40px; }
.atlas-footer strong { font-size: 17px; }
.atlas-footer p { color: var(--muted); font-size: 13px; }
.atlas-footer-links { display: flex; flex-direction: column; align-items: flex-start; gap: 7px; font-size: 13px; }
.atlas-footer-links span { font-weight: 800; color: var(--blue-dark); margin-bottom: 3px; }
.atlas-footer-links a:hover { color: var(--orange); }
.atlas-footer-bottom { border-top: 1px solid var(--line); margin-top: 30px; padding-top: 14px; color: var(--muted); font-size: 12px; display: flex; justify-content: space-between; gap: 20px; }

.atlas-intro { max-width: 740px; padding: 68px 0 42px; }
.atlas-intro h1 { font-size: 44px; line-height: 1.18; margin: 13px 0 15px; }
.atlas-intro p { color: var(--muted); font-size: 17px; }
.atlas-simple-page { padding-bottom: 40px; }
.atlas-split-intro { display: grid; grid-template-columns: 1.5fr .8fr; gap: 50px; align-items: end; }
.atlas-note { border-left: 4px solid var(--orange); background: var(--white); padding: 17px 19px; margin: 0 0 35px; }
.atlas-note strong { color: var(--blue-dark); }
.atlas-note p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
.atlas-step-line { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); margin: 38px 0 50px; }
.atlas-step-line div { padding: 20px; border-right: 1px solid var(--line); }
.atlas-step-line div:last-child { border-right: 0; }
.atlas-step-line b { display: block; color: var(--blue-dark); }
.atlas-step-line span { font-size: 13px; color: var(--muted); }
.atlas-prose { max-width: 780px; }
.atlas-prose h2 { font-size: 24px; margin: 34px 0 10px; }
.atlas-prose p { color: #4d5863; }
.atlas-device-index { border-top: 2px solid var(--ink); }
.atlas-device-row { display: grid; grid-template-columns: 1fr 1.35fr; gap: 40px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.atlas-device-row h2 { margin: 5px 0 8px; font-size: 26px; color: var(--blue-dark); }
.atlas-device-row span { color: var(--orange); font-weight: 800; font-size: 12px; }
.atlas-device-row p { color: #4d5863; margin: 0 0 11px; }
.atlas-observation-board { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 45px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.atlas-observation-board div { padding: 20px; border-right: 1px solid var(--line); }
.atlas-observation-board div:last-child { border-right: 0; }
.atlas-observation-board b { display: block; color: var(--blue-dark); }
.atlas-observation-board span { color: var(--muted); font-size: 14px; }
.atlas-method-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--ink); border-bottom: 1px solid var(--ink); }
.atlas-method-grid article { padding: 24px 17px; border-right: 1px solid var(--line); min-height: 190px; }
.atlas-method-grid article:last-child { border-right: 0; }
.atlas-method-grid span { font-size: 12px; color: var(--orange); font-weight: 800; }
.atlas-method-grid h2 { font-size: 21px; margin: 7px 0; }
.atlas-method-grid p { color: var(--muted); font-size: 14px; }
.atlas-network-reading { display: grid; grid-template-columns: 1.4fr .8fr; gap: 50px; padding: 40px 0; border-bottom: 1px solid var(--line); }
.atlas-network-reading h2 { font-size: 25px; margin: 0 0 12px; }
.atlas-network-reading p { color: var(--muted); }
.atlas-network-reading > div:last-child { display: flex; flex-direction: column; gap: 13px; align-items: flex-start; }
.atlas-help-groups { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 18px; }
.atlas-help-groups h2 { font-size: 20px; color: var(--blue-dark); border-bottom: 2px solid var(--ink); padding-bottom: 10px; }
.atlas-help-groups details { margin-bottom: 10px; }
.atlas-contact-sheet { border-top: 2px solid var(--ink); border-bottom: 1px solid var(--ink); padding: 28px 0; max-width: 760px; }
.atlas-contact-sheet a { font-size: 25px; color: var(--blue-dark); font-weight: 800; }
.atlas-contact-sheet p { color: var(--muted); margin-top: 14px; }

.atlas-article-page { max-width: 850px; margin: auto; padding-top: 68px; }
.atlas-article-page > h1 { font-size: 43px; line-height: 1.2; margin: 14px 0; }
.atlas-article-lead { font-size: 18px; color: #4d5863; border-bottom: 1px solid var(--line); padding-bottom: 28px; }
.atlas-article-copy { font-size: 16px; }
.atlas-article-copy section { padding: 24px 0; border-bottom: 1px solid var(--line); }
.atlas-article-copy h2 { font-size: 24px; line-height: 1.35; color: var(--blue-dark); margin: 0 0 10px; }
.atlas-article-copy p { color: #3f4c58; }
.atlas-reading-note { margin: 28px 0; border-left: 4px solid var(--blue); background: var(--white); padding: 17px 20px; }
.atlas-reading-note strong { color: var(--blue-dark); }
.atlas-reading-note p { margin: 5px 0 0; font-size: 14px; }
.atlas-related { margin-top: 58px; }
.atlas-not-found { padding: 130px 0; text-align: center; }
.atlas-not-found > span { color: var(--orange); font-size: 12px; font-weight: 800; letter-spacing: 2px; }
.atlas-not-found h1 { font-size: 42px; margin: 12px 0; }
.atlas-not-found p { color: var(--muted); margin-bottom: 25px; }

@media (max-width: 900px) {
  .atlas-hero { grid-template-columns: 1fr; gap: 32px; padding-top: 48px; }
  .atlas-hero-copy { max-width: none; }
  .atlas-hero-visual { max-width: 720px; }
  .atlas-workbench-grid { grid-template-columns: repeat(2, 1fr); }
  .atlas-workbench-grid a:nth-child(2) { border-right: 0; }
  .atlas-workbench-grid a:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .atlas-origin, .atlas-network-reading { grid-template-columns: 1fr; gap: 30px; }
  .atlas-faq-grid { grid-template-columns: repeat(2, 1fr); }
  .atlas-method-grid { grid-template-columns: repeat(2, 1fr); }
  .atlas-method-grid article:nth-child(2) { border-right: 0; }
  .atlas-method-grid article:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .atlas-help-groups { grid-template-columns: 1fr 1fr; }
  .atlas-help-groups section:last-child { grid-column: 1 / -1; }
  .atlas-split-intro { grid-template-columns: 1fr; gap: 0; }
  .atlas-footer-grid { grid-template-columns: 1fr 1fr; }
  .atlas-footer-grid > div:first-child { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .atlas-header-inner { min-height: 64px; padding: 0 16px; gap: 15px; }
  .atlas-menu-button { display: block; margin-left: auto; }
  .atlas-nav { display: none; position: absolute; left: 0; right: 0; top: 64px; background: var(--paper); border-bottom: 1px solid var(--line); padding: 10px 16px; flex-direction: column; align-items: stretch; box-shadow: 0 10px 20px rgba(31, 40, 49, .08); }
  .atlas-nav.is-open { display: flex; }
  .atlas-nav a { padding: 10px 3px; }
  .atlas-page { padding: 0 16px 46px; }
  .atlas-hero { padding: 37px 0 43px; min-height: 0; }
  .atlas-hero h1 { font-size: 34px; }
  .atlas-hero-copy > p { font-size: 16px; }
  .atlas-hero-facts { gap: 14px; flex-wrap: wrap; }
  .atlas-hero-visual { transform: none; padding: 5px; }
  .atlas-section-heading h2 { font-size: 26px; }
  .atlas-workbench, .atlas-matrix, .atlas-platforms, .atlas-articles, .atlas-faq { padding: 43px 0; }
  .atlas-workbench-grid { grid-template-columns: 1fr; }
  .atlas-workbench-grid a, .atlas-workbench-grid a:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .atlas-workbench-grid a:last-child { border-bottom: 0; }
  .atlas-region-head, .atlas-platform-head { display: none; }
  .atlas-region-row, .atlas-platform-row { grid-template-columns: 1fr; gap: 4px; padding: 15px 12px; }
  .atlas-region-row a, .atlas-platform-row a { text-align: left; margin-top: 5px; }
  .atlas-origin { padding: 43px 0; }
  .atlas-origin-copy h2 { font-size: 27px; }
  .atlas-origin-list { grid-template-columns: 1fr; }
  .atlas-origin-list div, .atlas-origin-list div:nth-child(even) { border-right: 0; }
  .atlas-article-row { grid-template-columns: 1fr; gap: 7px; padding: 20px 0; }
  .atlas-article-row h3 { font-size: 17px; }
  .atlas-faq-grid { grid-template-columns: 1fr; }
  .atlas-footer { padding: 34px 16px 18px; }
  .atlas-footer-grid { grid-template-columns: 1fr; gap: 25px; }
  .atlas-footer-grid > div:first-child { grid-column: auto; }
  .atlas-footer-bottom { flex-direction: column; gap: 5px; }
  .atlas-intro { padding: 43px 0 30px; }
  .atlas-intro h1 { font-size: 34px; }
  .atlas-intro p { font-size: 16px; }
  .atlas-step-line { grid-template-columns: 1fr; margin-top: 28px; }
  .atlas-step-line div { border-right: 0; border-bottom: 1px solid var(--line); }
  .atlas-step-line div:last-child { border-bottom: 0; }
  .atlas-device-row { grid-template-columns: 1fr; gap: 16px; padding: 23px 0; }
  .atlas-device-row h2 { font-size: 23px; }
  .atlas-observation-board { grid-template-columns: 1fr; }
  .atlas-observation-board div { border-right: 0; border-bottom: 1px solid var(--line); }
  .atlas-observation-board div:last-child { border-bottom: 0; }
  .atlas-method-grid { grid-template-columns: 1fr; }
  .atlas-method-grid article, .atlas-method-grid article:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .atlas-method-grid article:last-child { border-bottom: 0; }
  .atlas-help-groups { grid-template-columns: 1fr; }
  .atlas-help-groups section:last-child { grid-column: auto; }
  .atlas-article-page { padding-top: 43px; }
  .atlas-article-page > h1 { font-size: 33px; }
  .atlas-article-lead { font-size: 16px; }
  .atlas-article-copy { font-size: 15px; }
  .atlas-article-copy h2 { font-size: 22px; }
  .atlas-not-found { padding: 100px 0; }
  .atlas-not-found h1 { font-size: 34px; }
}