:root {
  --paper: #f4f6f8;
  --surface: #ffffff;
  --ink: #111820;
  --muted: #52606c;
  --line: #c9d2da;
  --blue: #126fbd;
  --blue-deep: #09558f;
  --blue-soft: #dceefb;
  --dark: #101c26;
  --dark-2: #182a38;
  --white: #f7fbfe;
  --dark-muted: #bed0dc;
  --radius: 16px;
  color-scheme: light dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, "Helvetica Neue", sans-serif;
  line-height: 1.5;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
p { text-wrap: pretty; }

.theme-light { background: var(--paper); color: var(--ink); }
.theme-blue-soft { background: var(--blue-soft); color: #102231; }
.theme-blue { background: var(--blue); color: var(--white); }
.theme-dark { background: var(--dark); color: var(--white); }

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 72px;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 0 clamp(20px, 5vw, 76px);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  color: var(--ink);
  backdrop-filter: blur(14px);
}
.mark { display: flex; align-items: center; gap: 12px; margin-right: auto; font-weight: 700; }
.mark img { width: 106px; height: 38px; object-fit: contain; }
.mark span { padding-left: 12px; border-left: 1px solid var(--line); }
.nav nav { display: flex; gap: 26px; font-size: 14px; }
.nav nav a:hover, .nav nav a:focus-visible { color: var(--blue); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 22px;
  border-radius: 999px;
  background: var(--ink);
  color: #ffffff;
  font-weight: 700;
  white-space: nowrap;
  transition: transform .15s ease, background .15s ease;
}
.button:hover, .button:focus-visible { background: var(--blue-deep); color: #ffffff; }
.button:active { transform: translateY(1px); }
.button.small { padding: 10px 17px; font-size: 14px; }
.button.inverse, .button.inverse:hover, .button.inverse:focus-visible { background: #ffffff; color: #102231; }
.text-link { font-weight: 700; border-bottom: 1px solid currentColor; }
.text-link:hover, .text-link:focus-visible { opacity: .72; }
.actions { display: flex; align-items: center; gap: 24px; margin-top: 32px; }
.kicker { margin: 0; color: var(--blue); font: 700 11px/1.3 monospace; letter-spacing: .14em; }
.theme-blue .kicker, .theme-dark .kicker { color: #90cdf8; }

.hero {
  min-height: calc(100dvh - 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr);
  align-items: center;
  gap: clamp(50px, 8vw, 130px);
  padding: clamp(58px, 8vh, 92px) clamp(20px, 6vw, 92px);
}
.hero h1 {
  max-width: 760px;
  margin: 22px 0;
  font-size: clamp(48px, 5.4vw, 80px);
  line-height: .96;
  letter-spacing: -.06em;
}
.hero-copy > p:not(.kicker) { max-width: 620px; margin: 0; color: var(--muted); font-size: clamp(18px, 2vw, 24px); }
.hero-summary { border-top: 1px solid var(--line); }
.hero-summary div { display: grid; gap: 7px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.hero-summary strong { font-size: 20px; }
.hero-summary span { color: var(--muted); }

.principles {
  display: grid;
  grid-template-columns: 1.15fr repeat(3, 1fr);
  padding: 0 clamp(20px, 6vw, 92px);
}
.principles > * { margin: 0; padding: 32px 22px; border-right: 1px solid #ffffff40; }
.principles > *:last-child { border-right: 0; }
.principles p { align-self: center; font-size: 22px; font-weight: 700; }
.principles div { display: grid; gap: 8px; }
.principles strong { color: #ffffff; }
.principles span { color: #edf7fd; font-size: 14px; }

.ownership {
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: clamp(50px, 9vw, 140px);
  padding: 120px clamp(20px, 6vw, 92px);
}
.ownership h2, .section-head h2, .commitment-intro h2, .contribute h2 {
  margin: 18px 0 22px;
  font-size: clamp(42px, 5.5vw, 78px);
  line-height: 1;
  letter-spacing: -.055em;
}
.ownership-copy { max-width: 720px; }
.ownership-copy p { margin: 0 0 26px; color: var(--dark-muted); font-size: 20px; }

.section, .workflows, .commitments, .safety, .providers { padding: 120px clamp(20px, 6vw, 92px); }
.section-head { max-width: 820px; margin-bottom: 60px; }
.section-head h2 { margin-top: 0; }
.section-head > p { max-width: 720px; margin: 0; color: var(--muted); font-size: 20px; }
.theme-blue-soft .section-head > p { color: #405b70; }
.theme-blue .section-head > p { color: #edf7fd; }

.capability-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; }
.capability-grid article {
  min-height: 230px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.capability-grid h3 { margin: 0 0 12px; font-size: 27px; letter-spacing: -.025em; }
.capability-grid p { max-width: 600px; margin: 0; color: var(--muted); font-size: 17px; }
.capability-grid .feature-large { grid-row: span 2; min-height: 478px; display: flex; flex-direction: column; justify-content: flex-end; background: var(--dark); color: var(--white); }
.capability-grid .feature-large p { color: var(--dark-muted); }
.capability-grid .feature-accent { background: var(--blue); color: #ffffff; border-color: var(--blue); }
.capability-grid .feature-accent p { color: #edf7fd; }

.workflow-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.workflow-columns article { padding: 36px; border-radius: var(--radius); background: #ffffff; }
.workflow-columns article:last-child { background: var(--blue); color: #ffffff; }
.workflow-columns h3 { margin: 0 0 24px; font-size: 30px; letter-spacing: -.03em; }
.workflow-columns ul { margin: 0; padding: 0; list-style: none; }
.workflow-columns li { padding: 14px 0; border-bottom: 1px solid #9cb6c8; }
.workflow-columns article:last-child li { border-color: #ffffff45; }

.commitments { display: grid; grid-template-columns: 1fr 1fr; gap: 50px 80px; }
.commitment-intro > p:last-child { color: var(--dark-muted); font-size: 19px; }
.commitments dl { margin: 0; }
.commitments dl div { padding: 17px 0; border-bottom: 1px solid #ffffff2e; }
.commitments dt { font-weight: 700; color: #ffffff; }
.commitments dd { margin: 5px 0 0; color: var(--dark-muted); }
.commitments .boundary { grid-column: 1 / -1; margin: 0; padding: 25px; border-radius: var(--radius); background: var(--dark-2); color: #d9eaf5; }
.commitments code { color: #ffffff; background: #ffffff17; }

.safety-flow { display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid #ffffff55; border-bottom: 1px solid #ffffff55; }
.safety-flow div { padding: 24px 20px; border-right: 1px solid #ffffff55; }
.safety-flow div:last-child { border-right: 0; }
.safety-flow span { color: #ffffff; font-weight: 700; }
.safety-flow p { margin: 10px 0 0; color: #edf7fd; font-size: 14px; }
.security-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 52px; margin-top: 56px; }
.security-grid p { margin: 0; color: #edf7fd; }
.security-grid b { color: #ffffff; }

.install ol { margin: 0 0 42px; padding: 0; list-style: none; counter-reset: steps; border-top: 1px solid var(--line); }
.install li {
  counter-increment: steps;
  display: grid;
  grid-template-columns: 48px 230px 1fr;
  gap: 22px;
  align-items: center;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.install li::before { content: counter(steps); color: var(--blue); font: 700 12px monospace; }
code { padding: 4px 7px; border-radius: 6px; background: #e4eaf0; color: #17222c; font-family: monospace; overflow-wrap: anywhere; }
.install aside { max-width: 760px; margin-left: auto; padding: 32px; border-radius: var(--radius); background: var(--blue); color: #ffffff; }
.install aside h3 { margin: 0 0 10px; font-size: 25px; }
.install aside p { margin: 0 0 18px; color: #edf7fd; }

.provider-groups { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.provider-groups article { position: relative; min-height: 190px; padding: 28px; border: 1px solid #9db9cd; border-radius: var(--radius); background: #f8fcff; }
.provider-groups h3 { margin: 0 0 10px; font-size: 27px; }
.provider-groups p { max-width: 540px; margin: 0; color: #405b70; }
.provider-groups span { position: absolute; right: 22px; bottom: 20px; color: var(--blue-deep); font: 700 11px monospace; text-transform: uppercase; }

.contribute { padding: 120px clamp(20px, 6vw, 92px); }
.contribute h2 { max-width: 900px; margin-top: 0; }
.contribute > p { max-width: 720px; margin: 0; color: var(--dark-muted); font-size: 20px; }
.contribute .text-link { color: #ffffff; }
footer { display: flex; align-items: center; gap: 28px; padding: 34px clamp(20px, 6vw, 92px); }
footer img { width: 120px; filter: brightness(0) invert(1); }
footer p { margin-right: auto; color: #e1eef7; }
footer a { color: #ffffff; font-weight: 700; }

@media (prefers-color-scheme: dark) {
  :root { --paper: #eaf0f4; --surface: #ffffff; --ink: #111820; --muted: #52606c; --line: #b9c6d0; }
  .nav { background: color-mix(in srgb, #f4f6f8 94%, transparent); }
}

@media (max-width: 980px) {
  .nav nav { display: none; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .principles { grid-template-columns: 1fr 1fr; }
  .principles > p { grid-column: 1 / -1; }
  .ownership, .commitments { grid-template-columns: 1fr; }
  .commitments .boundary { grid-column: 1; }
  .safety-flow { grid-template-columns: 1fr 1fr; }
  .safety-flow div { border-bottom: 1px solid #ffffff55; }
  .safety-flow div:nth-child(2n) { border-right: 0; }
  .safety-flow div:last-child { grid-column: 1 / -1; border-bottom: 0; }
}

@media (max-width: 660px) {
  .nav { padding: 0 16px; }
  .mark span { display: none; }
  .hero, .ownership, .section, .workflows, .commitments, .safety, .providers, .contribute { padding-left: 18px; padding-right: 18px; }
  .hero { gap: 50px; padding-top: 60px; padding-bottom: 70px; }
  .hero h1 { font-size: clamp(42px, 12.5vw, 56px); }
  .actions { align-items: flex-start; flex-direction: column; }
  .principles { grid-template-columns: 1fr; padding: 0 18px; }
  .principles > p { grid-column: auto; }
  .principles > * { border-right: 0; border-bottom: 1px solid #ffffff40; }
  .principles > *:last-child { border-bottom: 0; }
  .section-head { margin-bottom: 42px; }
  .capability-grid, .workflow-columns, .security-grid, .provider-groups { grid-template-columns: 1fr; }
  .capability-grid .feature-large { grid-row: auto; min-height: 300px; }
  .safety-flow { grid-template-columns: 1fr; }
  .safety-flow div, .safety-flow div:nth-child(2n) { border-right: 0; border-bottom: 1px solid #ffffff55; }
  .safety-flow div:last-child { grid-column: auto; }
  .install li { grid-template-columns: 30px 1fr; align-items: start; }
  .install li > :last-child { grid-column: 2; }
  .install aside { padding: 25px; }
  footer { align-items: flex-start; flex-wrap: wrap; }
  footer p { width: 100%; margin: 0; order: 3; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}