:root {
  --doc-bg: #f4f5f1;
  --doc-panel: #ffffff;
  --doc-soft: #eceee8;
  --doc-line: #d8dcd3;
  --doc-ink: #151713;
  --doc-muted: #5d6259;
  --doc-green: #bff2df;
  --doc-purple: #7253d6;
  --doc-blue: #cbdcfb;
  --doc-orange: #ffd6a6;
}

html { scroll-padding-top: 92px; }
.doc-body { margin: 0; background: var(--doc-bg); color: var(--doc-ink); font-size: 16px; line-height: 1.75; }
.doc-topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  width: 100%;
  min-height: 72px;
  padding: 0 clamp(22px, 3.2vw, 58px);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--doc-line);
  background: rgba(244,245,241,.94);
  backdrop-filter: blur(18px);
}
.doc-brand { display: flex; align-items: center; gap: 12px; }
.doc-brand > span { width: 38px; height: 38px; display: grid; place-items: center; border: 1.5px solid var(--doc-ink); border-radius: 50%; font: 800 12px/1 Arial, sans-serif; }
.doc-brand b { font-size: 14px; }
.doc-breadcrumb { display: flex; align-items: center; gap: 10px; color: var(--doc-muted); font-size: 13px; }
.doc-breadcrumb i { color: #a1a69d; font-style: normal; }
.doc-breadcrumb strong { color: var(--doc-ink); }
.doc-back { justify-self: end; min-height: 40px; padding: 0 15px; display: inline-flex; align-items: center; border: 1px solid var(--doc-ink); border-radius: 999px; font-size: 13px; font-weight: 750; transition: background .2s ease, color .2s ease, transform .2s ease; }
.doc-back:hover { background: var(--doc-ink); color: white; transform: translateX(-3px); }

.doc-layout { width: 100%; display: grid; grid-template-columns: 250px minmax(0, 1fr); }
.doc-sidebar {
  position: sticky;
  top: 72px;
  height: calc(100vh - 72px);
  padding: 42px 26px 28px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--doc-line);
  background: #eef0ea;
}
.doc-sidebar > p { margin: 0 0 20px; color: #848980; font: 800 12px/1 Arial, sans-serif; letter-spacing: .14em; }
.doc-sidebar nav { display: flex; flex-direction: column; gap: 5px; }
.doc-sidebar nav a { min-height: 44px; padding: 0 12px; display: flex; align-items: center; gap: 13px; border-radius: 10px; color: #41463e; font-size: 14px; font-weight: 650; transition: background .2s ease, color .2s ease; }
.doc-sidebar nav a:hover { background: var(--doc-panel); color: var(--doc-ink); }
.doc-sidebar nav span { width: 22px; color: #979c93; font: 700 12px/1 Arial, sans-serif; }
.doc-side-note { margin-top: auto; padding: 18px; display: flex; flex-direction: column; gap: 5px; border: 1px solid var(--doc-line); border-radius: 14px; background: var(--doc-panel); }
.doc-side-note b { margin-bottom: 4px; font-size: 14px; }
.doc-side-note span { color: var(--doc-muted); font-size: 12px; line-height: 1.55; }

.doc-main { min-width: 0; width: 100%; padding: 0 clamp(24px, 3.7vw, 68px) 54px; }
.doc-hero { padding: clamp(64px, 8vw, 120px) 0 64px; border-bottom: 1px solid var(--doc-line); }
.doc-label { margin-bottom: 24px; color: var(--doc-purple); font: 800 12px/1.4 Arial, sans-serif; letter-spacing: .13em; }
.doc-hero h1 { max-width: 1080px; margin: 0; font-size: clamp(48px, 5.7vw, 82px); line-height: 1.12; letter-spacing: -.035em; }
.doc-lead { max-width: 900px; margin: 30px 0 0; color: #3d423a; font-size: clamp(18px, 1.65vw, 23px); line-height: 1.8; }
.doc-meta { margin: 52px 0 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border: 1px solid var(--doc-line); border-radius: 16px; overflow: hidden; background: var(--doc-panel); }
.doc-meta div { min-height: 105px; padding: 20px; display: flex; flex-direction: column; justify-content: space-between; }
.doc-meta div + div { border-left: 1px solid var(--doc-line); }
.doc-meta dt { color: var(--doc-muted); font-size: 12px; font-weight: 700; }
.doc-meta dd { margin: 0; font-size: 15px; font-weight: 750; line-height: 1.5; }
.doc-status { display: inline-block; width: max-content; padding: 7px 10px; border-radius: 999px; background: var(--doc-green); font-size: 12px; line-height: 1; }
.doc-status-blue { background: var(--doc-blue); }

.doc-section { padding: 78px 0; border-bottom: 1px solid var(--doc-line); scroll-margin-top: 84px; }
.doc-section-head { margin-bottom: 38px; display: grid; grid-template-columns: 72px 1fr; align-items: start; gap: 20px; }
.doc-section-head > span { color: #a4a9a0; font: 800 42px/1 Arial, sans-serif; letter-spacing: -.05em; }
.doc-section-head p { margin: 2px 0 10px; color: var(--doc-purple); font: 800 12px/1.3 Arial, sans-serif; letter-spacing: .12em; }
.doc-section-head h2 { margin: 0; font-size: clamp(34px, 3.2vw, 50px); line-height: 1.2; letter-spacing: -.025em; }
.doc-prose { max-width: 1040px; }
.doc-prose p, .doc-paragraph { margin: 0 0 17px; color: #3e433b; font-size: 17px; line-height: 2; }
.doc-paragraph { max-width: 1080px; margin-bottom: 34px; }
.doc-subtitle { margin: 48px 0 20px; font-size: 23px; line-height: 1.45; }

.doc-grid { margin-top: 34px; display: grid; gap: 14px; }
.doc-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.doc-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.doc-card { min-height: 190px; padding: 24px; border: 1px solid var(--doc-line); border-radius: 15px; background: var(--doc-panel); }
.doc-card > span { color: var(--doc-purple); font-size: 12px; font-weight: 800; }
.doc-card h3 { margin: 42px 0 10px; font-size: 20px; line-height: 1.4; }
.doc-card p { margin: 0; color: var(--doc-muted); font-size: 15px; line-height: 1.75; }

.doc-split { margin-top: 22px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.doc-block { min-height: 230px; padding: 30px; border: 1px solid var(--doc-line); border-radius: 16px; background: var(--doc-panel); }
.doc-block-muted { background: var(--doc-soft); }
.doc-block > span { display: block; margin-bottom: 25px; color: var(--doc-purple); font-size: 12px; font-weight: 800; }
.doc-block h3 { margin: 0 0 20px; font-size: 22px; line-height: 1.4; }
.doc-block > p { margin: 0; color: var(--doc-muted); font-size: 16px; line-height: 1.9; }
.doc-accent-dark { background: #eef1ff; color: var(--doc-ink); border-color: #aebce7; }
.doc-accent-dark > span { color: var(--doc-purple); }
.doc-accent-dark > p { color: var(--doc-muted); }
.doc-accent-mint { background: var(--doc-green); border-color: #82cdb1; }
.doc-list { margin: 0; padding: 0; list-style: none; }
.doc-list li { position: relative; padding: 12px 0 12px 22px; border-top: 1px solid var(--doc-line); color: #42473f; font-size: 15px; line-height: 1.8; }
.doc-list li::before { content: ""; position: absolute; left: 2px; top: 25px; width: 6px; height: 6px; border-radius: 50%; background: var(--doc-purple); }
.doc-list li:last-child { padding-bottom: 0; }

.doc-role-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--doc-line); border-radius: 16px; overflow: hidden; background: var(--doc-panel); }
.doc-role-grid article { min-height: 145px; padding: 25px; }
.doc-role-grid article + article { border-left: 1px solid var(--doc-line); }
.doc-role-grid b { font-size: 17px; }
.doc-role-grid p { margin: 18px 0 0; color: var(--doc-muted); font-size: 15px; line-height: 1.75; }

.doc-flow { margin: 30px 0; padding: 24px; display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr; gap: 10px; align-items: center; border: 1px solid var(--doc-line); border-radius: 16px; background: #ecefe9; color: var(--doc-ink); }
.doc-flow-4 { grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; }
.doc-flow article { min-height: 140px; padding: 18px; display: flex; flex-direction: column; border: 1px solid var(--doc-line); border-radius: 12px; background: white; box-shadow: 0 8px 20px rgba(38,42,34,.04); }
.doc-flow article:nth-of-type(2) { border-color: #76bfa5; background: #e2f8ef; }
.doc-flow span { color: var(--doc-purple); font: 800 12px/1 Arial, sans-serif; }
.doc-flow b { margin-top: auto; font-size: 16px; line-height: 1.4; }
.doc-flow p { margin: 8px 0 0; color: var(--doc-muted); font-size: 13px; line-height: 1.55; }
.doc-flow i { color: #777c73; font-style: normal; font-weight: 800; }

.doc-table-wrap { margin-top: 24px; overflow-x: auto; border: 1px solid var(--doc-line); border-radius: 16px; background: var(--doc-panel); }
.doc-table { width: 100%; min-width: 780px; border-collapse: collapse; text-align: left; }
.doc-table th { padding: 17px 20px; background: var(--doc-soft); color: #555b52; font-size: 13px; line-height: 1.5; }
.doc-table td { padding: 19px 20px; border-top: 1px solid var(--doc-line); color: #40453d; font-size: 15px; line-height: 1.7; vertical-align: top; }
.doc-table td:first-child { color: var(--doc-ink); font-weight: 750; }

.doc-formula-grid { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 12px; align-items: stretch; }
.doc-formula-grid article { min-height: 270px; padding: 26px; display: flex; flex-direction: column; border: 1px solid var(--doc-ink); border-radius: 16px; background: var(--doc-panel); }
.doc-formula-grid article:first-child { background: var(--doc-blue); }
.doc-formula-grid article:last-child { background: var(--doc-green); }
.doc-formula-grid > div { display: grid; place-items: center; font-size: 24px; font-weight: 800; }
.doc-formula-grid span { font: 800 12px/1 Arial, sans-serif; }
.doc-formula-grid h3 { margin: 46px 0 8px; font-size: 28px; }
.doc-formula-grid b { font-size: 15px; }
.doc-formula-grid p { margin: auto 0 0; padding-top: 24px; color: #474c43; font-size: 14px; line-height: 1.75; }

.doc-callout { margin-top: 24px; padding: 28px 30px; display: grid; grid-template-columns: 160px 1fr; gap: 8px 24px; border: 1px solid #8a70da; border-radius: 16px; background: #f0ebff; }
.doc-callout span { grid-row: 1 / 3; color: var(--doc-purple); font-size: 13px; font-weight: 800; }
.doc-callout strong { font-size: 20px; line-height: 1.5; }
.doc-callout p { margin: 0; color: var(--doc-muted); font-size: 14px; line-height: 1.75; }
.doc-callout-blue { border-color: #6e94d8; background: #e9f1ff; }
.doc-callout-blue span { color: #2f65c3; }
.table-tag { display: inline-block; padding: 7px 10px; border-radius: 999px; font-size: 12px; font-weight: 750; line-height: 1; }
.tag-green { background: var(--doc-green); }
.tag-blue { background: var(--doc-blue); }
.tag-orange { background: var(--doc-orange); }
.tag-gray { background: #e1e3de; }

.doc-metrics { display: grid; grid-template-columns: repeat(4, 1fr); overflow: hidden; border: 1px solid var(--doc-line); border-radius: 16px; background: white; color: var(--doc-ink); }
.doc-metrics article { min-height: 205px; padding: 26px; display: flex; flex-direction: column; }
.doc-metrics article + article { border-left: 1px solid var(--doc-line); }
.doc-metrics span { color: var(--doc-purple); font-size: 13px; font-weight: 750; }
.doc-metrics strong { margin-top: auto; font-size: clamp(30px, 3vw, 48px); line-height: 1.15; letter-spacing: -.025em; }
.doc-metrics p { margin: 9px 0 0; color: var(--doc-muted); font-size: 13px; }
.doc-siemens .doc-flow span, .doc-siemens .doc-metrics span { color: #2f65c3; }

.doc-footer-nav { margin-top: 24px; display: grid; grid-template-columns: 1fr 1fr; overflow: hidden; border: 1px solid var(--doc-line); border-radius: 16px; background: var(--doc-panel); }
.doc-footer-nav a { min-height: 125px; padding: 24px 28px; display: flex; flex-direction: column; justify-content: space-between; transition: background .2s ease; }
.doc-footer-nav a + a { border-left: 1px solid var(--doc-line); text-align: right; }
.doc-footer-nav a:hover { background: var(--doc-green); }
.doc-footer-nav span { color: var(--doc-muted); font-size: 12px; }
.doc-footer-nav b { font-size: 19px; line-height: 1.4; }

.doc-siemens .doc-label, .doc-siemens .doc-section-head p, .doc-siemens .doc-card > span, .doc-siemens .doc-block > span { color: #2f65c3; }
.doc-siemens .doc-list li::before { background: #2f65c3; }

@media (max-width: 1180px) {
  .doc-layout { grid-template-columns: 210px minmax(0, 1fr); }
  .doc-sidebar { padding-inline: 18px; }
  .doc-grid-4 { grid-template-columns: 1fr 1fr; }
  .doc-meta { grid-template-columns: repeat(3, 1fr); }
  .doc-meta div:nth-child(4) { border-left: 0; border-top: 1px solid var(--doc-line); }
  .doc-meta div:nth-child(5) { border-top: 1px solid var(--doc-line); }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 126px; }
  .doc-topbar { min-height: 66px; grid-template-columns: 1fr auto; }
  .doc-breadcrumb { display: none; }
  .doc-layout { grid-template-columns: 1fr; }
  .doc-sidebar { top: 66px; z-index: 20; width: 100%; height: 58px; padding: 8px 18px; display: block; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--doc-line); scrollbar-width: none; }
  .doc-sidebar::-webkit-scrollbar { display: none; }
  .doc-sidebar > p, .doc-side-note { display: none; }
  .doc-sidebar nav { width: max-content; flex-direction: row; gap: 5px; }
  .doc-sidebar nav a { min-height: 40px; padding-inline: 12px; background: rgba(255,255,255,.7); }
  .doc-main { padding-inline: 22px; }
  .doc-hero { padding-top: 65px; }
  .doc-section { scroll-margin-top: 132px; }
  .doc-grid-3 { grid-template-columns: 1fr; }
  .doc-card { min-height: 0; }
  .doc-card h3 { margin-top: 24px; }
  .doc-split { grid-template-columns: 1fr; }
  .doc-role-grid { grid-template-columns: 1fr; }
  .doc-role-grid article { min-height: 0; }
  .doc-role-grid article + article { border-left: 0; border-top: 1px solid var(--doc-line); }
  .doc-flow { width: 100%; min-width: 0; display: flex; flex-direction: column; align-items: stretch; }
  .doc-flow article { width: 100%; min-height: 110px; }
  .doc-flow i { align-self: center; transform: rotate(90deg); }
  .doc-formula-grid { grid-template-columns: 1fr; }
  .doc-formula-grid > div { min-height: 28px; }
  .doc-formula-grid article { min-height: 230px; }
  .doc-callout { grid-template-columns: 1fr; }
  .doc-callout span { grid-row: auto; }
  .doc-metrics { grid-template-columns: 1fr 1fr; }
  .doc-metrics article:nth-child(3) { border-left: 0; }
  .doc-metrics article:nth-child(-n+2) { border-bottom: 1px solid var(--doc-line); }
}

@media (max-width: 600px) {
  .doc-body { font-size: 16px; }
  .doc-topbar { padding-inline: 14px; }
  .doc-brand b { display: none; }
  .doc-back { padding-inline: 13px; }
  .doc-sidebar { padding-inline: 10px; }
  .doc-sidebar nav a { font-size: 13px; }
  .doc-main { padding-inline: 14px; padding-bottom: 28px; }
  .doc-hero { padding: 52px 0 44px; }
  .doc-label { font-size: 12px; line-height: 1.6; }
  .doc-hero h1 { font-size: clamp(39px, 12vw, 52px); line-height: 1.18; letter-spacing: -.025em; }
  .doc-lead { font-size: 17px; line-height: 1.85; }
  .doc-meta { grid-template-columns: 1fr 1fr; }
  .doc-meta div { min-height: 96px; padding: 16px; border-top: 1px solid var(--doc-line); }
  .doc-meta div:nth-child(-n+2) { border-top: 0; }
  .doc-meta div:nth-child(odd) { border-left: 0; }
  .doc-meta div:nth-child(5) { grid-column: 1 / -1; }
  .doc-section { padding: 58px 0; }
  .doc-section-head { grid-template-columns: 50px 1fr; gap: 10px; margin-bottom: 30px; }
  .doc-section-head > span { font-size: 31px; }
  .doc-section-head p { font-size: 12px; line-height: 1.6; }
  .doc-section-head h2 { font-size: 31px; line-height: 1.28; }
  .doc-prose p, .doc-paragraph { font-size: 16px; line-height: 1.95; }
  .doc-grid-4 { grid-template-columns: 1fr; }
  .doc-card { padding: 22px; }
  .doc-block { min-height: 0; padding: 24px 22px; }
  .doc-subtitle { margin-top: 38px; font-size: 20px; }
  .doc-table th { font-size: 13px; }
  .doc-table td { font-size: 14px; }
  .doc-flow { padding: 18px; }
  .doc-formula-grid article { min-height: 220px; padding: 23px; }
  .doc-callout { padding: 23px; }
  .doc-callout strong { font-size: 18px; }
  .doc-metrics { grid-template-columns: 1fr; }
  .doc-metrics article { min-height: 155px; border-left: 0 !important; border-bottom: 1px solid var(--doc-line); }
  .doc-metrics article:last-child { border-bottom: 0; }
  .doc-footer-nav { grid-template-columns: 1fr; }
  .doc-footer-nav a { min-height: 105px; }
  .doc-footer-nav a + a { border-left: 0; border-top: 1px solid var(--doc-line); text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}