:root {
  color-scheme: light;
  --paper: #f7f5ef;
  --ink: #172b3a;
  --muted: #52616b;
  --orange: #e97732;
  --line: #d5d8d4;
  --wash: #eeece4;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-size: 16px; line-height: 1.7; }
img, svg { display: block; max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-underline-offset: .25em; }
button { font: inherit; }
button, summary { cursor: pointer; }
button[hidden] { display: none; }
::selection { color: var(--ink); background: #f4c4a3; }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 5px; }
section, main { scroll-margin-top: 24px; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2 { font-family: Georgia, "Times New Roman", serif; font-weight: 400; }
h2 { font-size: clamp(34px, 3.6vw, 46px); line-height: 1.16; letter-spacing: -.035em; }
h3 { font-size: 25px; line-height: 1.3; font-weight: 550; letter-spacing: -.035em; }
p + p { margin-top: 18px; }
.container { width: min(100% - 96px, 1160px); margin-inline: auto; }
.section { padding-block: 88px; }
.eyebrow { font-size: 12px; line-height: 1.5; font-weight: 650; letter-spacing: .12em; text-transform: uppercase; }
.section-heading .eyebrow, .section-intro .eyebrow { margin-bottom: 20px; }
.section-heading > p:not(.eyebrow) { color: var(--muted); margin-top: 24px; max-width: 36ch; }
.text-link { display: inline-flex; align-items: center; gap: 13px; font-size: 14px; font-weight: 650; text-decoration-thickness: 1px; }
.text-link:hover { text-decoration-thickness: 2px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 22px; min-height: 52px; padding: 12px 22px; font-size: 14px; font-weight: 650; line-height: 1.4; text-decoration: none; border: 1px solid transparent; border-radius: 3px; transition: background-color .18s ease; }
.button-primary { color: var(--paper); background: var(--ink); }
.button-primary:hover { background: #294355; }
.button-outline { border-color: var(--line); }
.button-outline:hover { background: var(--wash); border-color: var(--ink); }
.button-small { min-height: 44px; padding: 10px 16px; }
.skip-link { position: absolute; z-index: 5; top: 12px; left: 16px; padding: 10px 18px; background: var(--ink); color: var(--paper); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); outline-color: var(--orange); }

.site-header { border-bottom: 1px solid var(--line); }
.header-inner { min-height: 100px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.brand span, .footer-brand { font-size: 30px; font-weight: 650; letter-spacing: -.06em; }
.brand img { object-fit: contain; }
.site-nav { display: flex; align-items: center; gap: 30px; }
.site-nav > a { font-size: 13px; font-weight: 550; text-decoration: none; }
.site-nav > a:not(.button):hover { text-decoration: underline; }
.site-nav .button { margin-left: 14px; }
.menu-toggle { display: none; }

.hero { display: grid; grid-template-columns: 1.06fr 1fr; align-items: center; gap: 24px; padding-block: 86px 94px; }
.hero-copy { position: relative; z-index: 1; }
.hero .eyebrow { display: flex; align-items: center; gap: 10px; margin-bottom: 30px; }
.accent-line { height: 2px; width: 26px; background: var(--orange); }
h1 { font-size: clamp(64px, 7.7vw, 104px); line-height: 1.02; letter-spacing: -.055em; }
.hero-description { max-width: 40ch; margin-top: 28px; font-size: 18px; line-height: 1.75; color: var(--muted); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 22px; margin-top: 32px; }
.hero-note { max-width: 43ch; font-size: 12px; color: var(--muted); margin-top: 23px; }
.hero-art { min-width: 0; }
.network-art { width: 100%; height: auto; }
.hero-art figcaption { display: flex; justify-content: center; gap: 12px; color: var(--muted); font-size: 12px; letter-spacing: .03em; }

.project-section { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; border-top: 1px solid var(--line); }
.project-copy { padding-top: 36px; color: var(--muted); }
.project-copy .text-link, .vault-copy .text-link { color: var(--ink); margin-top: 26px; }
.services-section { padding-top: 32px; }
.section-intro { margin-bottom: 48px; }
.pillars { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 36px; }
.pillar { display: flex; flex-direction: column; align-items: flex-start; border-top: 1px solid var(--ink); padding-top: 22px; }
.pillar-number { font-family: Georgia, "Times New Roman", serif; font-size: 18px; color: var(--muted); margin-bottom: 32px; }
.status { display: inline-block; font-size: 12px; font-weight: 550; border: 1px solid var(--line); border-radius: 3px; padding: 3px 9px; margin-top: 16px; }
.pillar > p:not(.status) { color: var(--muted); font-size: 15px; margin-top: 20px; margin-bottom: 28px; }
.pillar .text-link { margin-top: auto; }
.vault-section { background: var(--wash); border-block: 1px solid var(--line); }
.vault-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; padding-block: 74px; }
.section-heading .vault-note { color: var(--ink); font-size: 12px; font-weight: 550; }
.vault-copy { padding-top: 4px; color: var(--muted); }

.resources-section { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; align-items: center; }
.resource-link { display: block; padding-block: 30px; border-block: 1px solid var(--ink); text-decoration: none; }
.resource-source { display: block; font-size: 13px; font-weight: 650; }
.external-label { font-weight: 400; color: var(--muted); }
.resource-title { display: block; font-family: Georgia, "Times New Roman", serif; font-size: 30px; line-height: 1.3; letter-spacing: -.03em; margin-block: 24px 32px; }
.resource-bottom { display: flex; align-items: center; justify-content: space-between; gap: 18px; font-size: 12px; color: var(--muted); }
.resource-bottom > span { color: var(--ink); font-size: 24px; }
.resource-link:hover .resource-title { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .2em; }
.faq-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; border-top: 1px solid var(--line); }
.faq-list { min-width: 0; }
details { border-bottom: 1px solid var(--line); }
details:first-child { border-top: 1px solid var(--line); }
summary { position: relative; padding: 23px 42px 23px 0; font-size: 16px; font-weight: 550; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; top: 21px; right: 3px; width: 26px; height: 26px; display: grid; place-items: center; font-size: 23px; font-weight: 400; line-height: 1; }
details[open] summary::after { content: "−"; }
summary:hover { text-decoration: underline; text-underline-offset: .25em; }
.faq-answer { padding: 0 36px 26px 0; color: var(--muted); font-size: 15px; }

.site-footer { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; border-top: 1px solid var(--line); padding-block: 34px 40px; }
.footer-brand { font-size: 26px; }
.site-footer p { font-size: 12px; color: var(--muted); margin-top: 4px; }

@media (min-width: 1440px) {
  .hero { padding-block: 108px 112px; }
}

@media (max-width: 1000px) {
  .container { width: calc(100% - 64px); }
  .site-nav { gap: 20px; }
  .site-nav .button { margin-left: 0; }
  .hero { gap: 8px; padding-block: 70px; }
  .hero-description { font-size: 17px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 18px; }
  .project-section, .vault-inner, .resources-section { gap: 48px; }
  .pillars { gap: 24px; }
  .faq-section { gap: 36px; }
}

@media (max-width: 760px) {
  .container { width: calc(100% - 40px); }
  .section { padding-block: 60px; }
  .header-inner { min-height: 80px; flex-wrap: wrap; gap: 0; padding-block: 18px; }
  .brand span { font-size: 28px; }
  .brand img { width: 32px; height: 32px; }
  .menu-toggle:not([hidden]) { display: inline-flex; align-items: center; gap: 12px; min-height: 44px; padding: 8px 12px; color: var(--ink); background: transparent; border: 1px solid var(--line); border-radius: 3px; font-size: 13px; }
  .site-nav { width: 100%; flex-wrap: wrap; gap: 20px; padding-top: 22px; padding-bottom: 4px; }
  .site-nav > a:not(.button) { padding-block: 6px; }
  .site-nav .button { margin-left: 0; }
  .site-header.menu-ready .site-nav[data-open="false"] { display: none; }
  .hero { grid-template-columns: 1fr; gap: 16px; padding-block: 54px 48px; }
  .hero .eyebrow { font-size: 11px; margin-bottom: 26px; }
  h1 { font-size: clamp(54px, 11.5vw, 86px); }
  .hero-description { max-width: 44ch; margin-top: 25px; }
  .hero-actions { flex-direction: row; align-items: center; gap: 20px; margin-top: 28px; }
  .hero-note { max-width: 45ch; }
  .hero-art { width: min(100%, 440px); margin-inline: auto; }
  .hero-art figcaption { margin-top: -8px; font-size: 11px; }
  .project-section, .vault-inner, .resources-section, .faq-section { grid-template-columns: 1fr; gap: 28px; }
  .project-copy, .vault-copy { padding-top: 0; }
  .services-section { padding-top: 10px; }
  .section-intro { margin-bottom: 36px; }
  .pillars { grid-template-columns: 1fr; gap: 36px; }
  .pillar { position: relative; padding-top: 25px; padding-left: 44px; }
  .pillar-number { position: absolute; left: 0; top: 24px; font-size: 16px; margin: 0; }
  .pillar > p:not(.status) { max-width: 48ch; margin-bottom: 20px; }
  .vault-inner { padding-block: 56px; }
  .resource-link { padding-block: 24px; }
  .resource-title { font-size: 28px; margin-block: 22px; }
  .resource-bottom { font-size: 11px; }
  .site-footer { align-items: flex-start; flex-direction: column; gap: 18px; padding-block: 28px 34px; }
}

@media (max-width: 380px) {
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .pillar { padding-left: 36px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* Network roadmap and independent educational resources. */
.network-states { width: 100%; margin-block: 18px 22px; font-size: 12px; }
.network-states p { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; margin: 0; padding-block: 8px; border-bottom: 1px solid var(--line); }
.network-states strong { font-weight: 600; }
.network-states span { color: var(--muted); }
.resource-list { min-width: 0; }
.resource-list .resource-link + .resource-link { margin-top: 20px; }

/* Bitfay palette: petrol logo, cyan emphasis, warm status, separate surfaces. */
:root{--bg:#f2f6f7;--surface:#ffffff;--surface-alt:#e4eef1;--text:#193745;--subtle:#48616e;--border:#b8ccd3;--accent:#116275;--accent-hover:#0c4e60;--on-accent:#ffffff;--link:#0c617e;--focus:#087b97;--warm:#855416;--warm-bg:#fcf0d9;--shadow:0 8px 28px #1538480a;color-scheme:light}
:root[data-theme=dark]{--bg:#0c1d27;--surface:#152e3b;--surface-alt:#1c3d4b;--text:#e6f2f5;--subtle:#b5ccd5;--border:#476776;--accent:#70d0df;--accent-hover:#9ce0e9;--on-accent:#0c2832;--link:#91dce9;--focus:#b2eaf3;--warm:#f3cf91;--warm-bg:#3e3424;--shadow:0 8px 28px #00000018;color-scheme:dark}
body{background:var(--bg);color:var(--text)}
.theme-control{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:650;white-space:nowrap;color:var(--subtle)}
.theme-control select{width:auto;min-height:40px;padding:7px 10px;font-size:13px;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:7px}
.theme-control label{margin:0;font-size:12px}
.tab-list{display:flex;gap:6px;flex-wrap:wrap;border-bottom:1px solid var(--border);padding:0 0 12px;margin:0 0 24px}
.tab-list button{min-height:44px;padding:9px 16px;border:1px solid transparent;border-radius:7px;font:inherit;font-size:14px;font-weight:650;background:transparent;color:var(--subtle);cursor:pointer;margin:0}
.tab-list button:hover{background:var(--surface-alt);color:var(--text)}
.tab-list button[aria-selected=true]{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
[data-tab-panel]{min-width:0}
[hidden]{display:none!important}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
@media(max-width:620px){.theme-control{gap:4px}.theme-control>label{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.theme-control select{max-width:130px}.tab-list{gap:4px}.tab-list button{padding:9px 11px;font-size:13px}}

:root{--paper:var(--bg);--ink:var(--text);--muted:var(--subtle);--orange:var(--accent);--line:var(--border);--wash:var(--surface-alt)}
body{line-height:1.6}h1,h2{font-family:inherit;font-weight:650}h1{font-size:clamp(42px,5.8vw,72px)}h2{font-size:clamp(28px,3vw,36px)}
.site-header{background:var(--surface)}.header-inner{min-height:80px;gap:20px}.container{width:min(100% - 48px,1160px)}
.hero{padding-block:42px 38px;gap:36px}.hero .eyebrow{margin-bottom:20px}.hero-description{font-size:16px;margin-top:20px}.hero-actions{margin-top:24px}.network-art{max-height:350px}.hero-note{max-width:58ch}.button-primary{background:var(--accent);color:var(--on-accent);border-radius:7px}.button-primary:hover{background:var(--accent-hover)}
.section{padding-block:26px 40px}.project-section{gap:40px;border-top:0}.project-copy{padding-top:0}.section-intro{margin-bottom:28px}.pillars{gap:20px}.pillar{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:24px;box-shadow:var(--shadow)}.pillar-number{margin-bottom:14px;font-family:inherit;color:var(--accent)}
.status,.network-states p>span{color:var(--warm);background:var(--warm-bg);border-color:var(--warm)}
.vault-section{background:var(--surface);color:var(--text);margin:0 auto 36px;width:min(100% - 48px,1160px);border:1px solid var(--border);border-radius:10px}.vault-inner{padding-block:28px;gap:40px}.vault-section .eyebrow,.vault-copy .text-link{color:var(--link)}.vault-note,.vault-copy{color:var(--subtle)}
.resource-link{background:var(--surface);border:1px solid var(--border);border-radius:10px}.resource-link:hover{background:var(--surface-alt)}.resource-link .resource-source{color:var(--link)}.faq-list details{background:var(--surface);padding:0 20px;border:1px solid var(--border);border-radius:8px;margin-bottom:10px}.site-footer{padding-block:22px;margin-top:20px}
.network-art [stroke="#172b3a"]{stroke:var(--subtle)}.network-art [fill="#172b3a"]{fill:var(--subtle)}.network-art [fill="#f7f5ef"]{fill:var(--surface)}.network-art text{fill:var(--subtle)}
::selection{color:var(--on-accent);background:var(--accent)}
@media(max-width:760px){.header-inner{flex-wrap:wrap;gap:12px;padding-block:12px;min-height:72px}.header-inner .theme-control{order:1;margin-left:auto}.header-inner .menu-toggle{order:2}.header-inner .site-nav{order:3}.hero{padding-top:28px;gap:20px}.hero-art{display:none}.hero-copy{max-width:620px}.container{width:calc(100% - 32px)}.pillars{grid-template-columns:1fr}.project-section,.resources-section,.vault-inner,.faq-section{grid-template-columns:1fr;gap:24px}.vault-section{width:calc(100% - 32px)}.section{padding-block:20px 28px}.hero-actions{gap:18px}.hero h1{font-size:46px}.header-inner .menu-toggle{min-height:40px}.site-nav{width:100%}.tab-list.container{margin-inline:auto}}

.resource-link{padding:24px}.pillar-number{position:static}.pillar{padding:24px}.theme-control select{border-color:var(--control)}:root{--control:#6c8b99}:root[data-theme=dark]{--control:#7295a6}

.tab-list.container{margin-inline:auto}