/* ============================================
   OpenFederation — Shared Stylesheet
   ============================================ */

/* --- Custom Properties --- */
:root {
  --ink: #131920;
  --signal: #17897A;
  --signal-dark: #4FD8C4;
  --mist: #A8CFC8;
  --slate: #4B5563;
  --muted: #6B7280;
  --faint: #9CA3AF;
  --line: #E4E6E3;
  --paper: #F8F9F8;
  --white: #FFFFFF;
  --badge-tint: #E8F2F0;
  --badge-border: #BCD9D3;
  --max: 1100px;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; }
html { height: 100%; }

body {
  min-height: 100%;
  margin: 0;
  font-family: 'Public Sans', ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

/* --- Accessibility --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 1000;
  padding: 8px 16px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 0 0 4px 4px;
  font-size: 14px;
  text-decoration: none;
  transition: top .2s;
}
.skip-link:focus { top: 0; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

/* --- Utility --- */
.text-muted { color: var(--slate); }

/* --- Layout --- */
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  background: var(--paper);
}

/* --- Header / nav --- */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 48px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.brand svg { display: block; flex-shrink: 0; }

.wordmark {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.03em;
}
.wordmark-scope { color: var(--signal); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}
.nav-links a {
  font-family: 'Public Sans', sans-serif;
  font-weight: 500;
  font-size: 13.5px;
  color: var(--slate);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.nav-links a:hover { color: var(--signal); }
.nav-links a.is-active {
  color: var(--ink);
  border-bottom-color: var(--signal);
}
.nav-github {
  font-family: 'JetBrains Mono', monospace !important;
  font-size: 12.5px !important;
}


/* --- Form --- */
form {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

input[type="email"] {
  flex: 1 1 200px;
  min-width: 200px;
  padding: 11px 16px;
  border-radius: 4px;
  border: 1px solid #CFD6D3;
  background: var(--white);
  color: var(--ink);
  font-size: 13.5px;
  font-family: 'Public Sans', sans-serif;
  outline: none;
  transition: border-color .15s ease;
}
input[type="email"]::placeholder { color: var(--faint); }
input[type="email"]:focus { border-color: var(--signal); }


/* --- Article View --- */
.back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'Public Sans', sans-serif;
  font-size: 13px;
  font-weight: 600;
  color: var(--slate);
  text-decoration: none;
  margin-bottom: 24px;
}
.back:hover { color: var(--signal); }

.article-wrap { max-width: 640px; margin: 0 auto; padding: 56px 48px 48px; }
.article-meta {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 20px;
}
.article-date {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 12px;
  color: var(--faint);
}
.article-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 36px;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0 0 18px;
}
.article-rule { border-top: 1px solid var(--line); margin-bottom: 32px; }

.article { font-family: 'Public Sans', sans-serif; }
.article h2 {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 23px;
  letter-spacing: -0.01em;
  margin: 32px 0 14px;
}
.article h3 { font-size: 18px; font-weight: 600; margin: 28px 0 10px; color: var(--ink); }
.article h4, .article h5, .article h6 { margin: 22px 0 8px; font-size: 16px; }
.article p { margin: 0 0 20px; font-size: 15.5px; line-height: 1.75; }
.article ul, .article ol { margin: 0 0 20px; padding-left: 24px; }
.article li { margin-bottom: 8px; font-size: 15.5px; line-height: 1.7; }
.article a {
  color: var(--signal);
  text-decoration: underline;
  text-decoration-color: var(--mist);
  text-underline-offset: 3px;
}
.article a:hover { text-decoration-color: var(--signal); }
.article code {
  font-family: 'JetBrains Mono', monospace;
  font-size: .88em;
  background: var(--badge-tint);
  padding: 3px 7px;
  border-radius: 4px;
  color: var(--signal);
}
.article pre {
  margin: 0 0 20px;
  padding: 18px 22px;
  border-radius: 8px;
  background: var(--ink);
  overflow-x: auto;
}
.article pre code {
  background: none;
  color: #A7B1C2;
  padding: 0;
  font-size: 13px;
  line-height: 1.8;
}
.article blockquote {
  margin: 0 0 20px;
  padding: 18px 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--signal);
  border-radius: 0 6px 6px 0;
}
.article blockquote p { margin-bottom: 0; color: var(--slate); font-size: 14px; line-height: 1.7; }
.article hr { border: none; height: 1px; background: var(--line); margin: 32px 0; }
.article img { max-width: 100%; height: auto; border-radius: 6px; margin: 12px 0; }
.article strong { font-weight: 700; }

.article-cta {
  margin-top: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 24px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  background: var(--white);
}
.article-cta form { display: flex; gap: 8px; flex-wrap: wrap; }


/* --- Footer --- */
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 20px 48px;
  border-top: 1px solid var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--faint);
}
.site-footer a { color: inherit; text-decoration: none; }
.site-footer a:hover { color: var(--signal); }
.footer-logo {
  height: 14px;
  width: auto;
  vertical-align: middle;
  margin-left: 6px;
  opacity: .8;
}

/* --- Buttons (new) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 4px;
  font-family: 'Public Sans', sans-serif;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: #0c1017; }
.btn-secondary { background: transparent; border-color: #CFD6D3; color: var(--ink); }
.btn-secondary:hover { background: var(--white); }
.btn-signal { background: var(--signal); color: var(--white); border: none; }
.btn-signal:hover { background: #0f6e62; }

/* --- Hero --- */
.hero {
  padding: 64px 48px 56px;
  border-bottom: 1px solid var(--line);
}
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: .02em;
  color: var(--signal);
  border: 1px solid var(--badge-border);
  border-radius: 99px;
  padding: 5px 12px;
  margin-bottom: 26px;
  text-transform: uppercase;
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  display: inline-block;
}
.hero h1 {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  max-width: 640px;
  margin: 0 0 20px;
}
.hero-lede {
  font-size: 17px;
  line-height: 1.65;
  color: var(--slate);
  max-width: 560px;
  margin: 0 0 30px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* --- Pillars --- */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line);
}
.pillar {
  padding: 32px 36px;
  border-right: 1px solid var(--line);
}
.pillar:last-child { border-right: none; }
.pillar-label {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 11px;
  color: var(--signal);
  margin-bottom: 10px;
}
.pillar-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 17px;
  margin: 0 0 8px;
}
.pillar-body {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--slate);
  margin: 0;
}

/* --- Architecture + Roadmap --- */
.arch-roadmap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--line);
}
.arch-col {
  padding: 44px 48px;
  border-right: 1px solid var(--line);
}
.roadmap-col { padding: 44px 48px; }
.arch-title, .roadmap-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 22px;
  margin: 0 0 14px;
}
.arch-copy {
  font-size: 14px;
  line-height: 1.65;
  color: var(--slate);
  margin: 0 0 22px;
}
.arch-diagram { width: 100%; height: auto; display: block; }
.roadmap-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 13.5px;
  line-height: 1.5;
}
.roadmap-row { display: flex; gap: 12px; align-items: baseline; }
.roadmap-status {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 11px;
  color: var(--faint);
  min-width: 60px;
}
.roadmap-status.is-active { color: var(--signal); }
.roadmap-jump {
  display: inline-block;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
.roadmap-jump:hover { color: var(--signal-dark); }

/* --- Full roadmap breakdown --- */
.roadmap-full {
  padding: 48px 48px 56px;
  border-bottom: 1px solid var(--line);
}
.roadmap-full-header { max-width: 640px; margin-bottom: 28px; }
.roadmap-full-header .btn { margin-top: 14px; }
.roadmap-groups {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.roadmap-group-title {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.roadmap-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}
.roadmap-dot.dot-done { background: var(--signal); }
.roadmap-dot.dot-validating { background: #D6A828; }
.roadmap-dot.dot-next { background: var(--faint); }
.roadmap-items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--slate);
}
.roadmap-items li { padding-left: 14px; position: relative; }
.roadmap-items li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  background: var(--line);
  border-radius: 50%;
}
.roadmap-items code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 1px 4px;
}

/* --- Email CTA --- */
.cta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  padding: 40px 48px;
  border-bottom: 1px solid var(--line);
}
.cta form { display: flex; gap: 8px; flex-wrap: wrap; }
.cta-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 18px;
  margin: 0 0 4px;
}
.cta-note { font-size: 13px; color: var(--muted); margin: 0; }
.fineprint { text-align: center; padding: 12px 48px 0; font-size: 13px; color: var(--muted); }
#form-message { color: var(--signal); font-weight: 600; }

/* --- Updates index --- */
.updates-header { padding: 56px 48px 36px; border-bottom: 1px solid var(--line); }
.updates-label {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 11px;
  color: var(--signal);
  margin-bottom: 14px;
}
.updates-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 38px;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 12px;
}
.updates-lede { font-size: 15.5px; line-height: 1.6; color: var(--slate); max-width: 520px; margin: 0; }

.updates-list { padding: 8px 48px 0; }
.update-row {
  display: flex;
  gap: 28px;
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
}
.updates-list .update-row:last-child { border-bottom: none; }
.update-date {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 12px;
  color: var(--faint);
  min-width: 96px;
  padding-top: 4px;
  flex-shrink: 0;
}
.update-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 500;
  font-size: 11px;
  background: var(--badge-tint);
  color: var(--signal);
  padding: 4px 10px;
  border-radius: 3px;
  margin-bottom: 10px;
}
.update-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}
.update-excerpt { font-size: 14px; line-height: 1.65; color: var(--slate); max-width: 600px; margin: 0; }
.update-readmore {
  display: inline-block;
  font-family: 'Public Sans', sans-serif;
  font-weight: 600;
  font-size: 13px;
  color: var(--signal);
  margin-top: 12px;
}
.empty { text-align: center; color: var(--muted); padding: 80px 20px; font-size: 16px; }

/* --- Responsive --- */
@media (max-width: 900px) {
  .arch-roadmap { grid-template-columns: 1fr; }
  .arch-col { border-right: none; border-bottom: 1px solid var(--line); }
  .roadmap-groups { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .pillars { grid-template-columns: 1fr; }
  .pillar { border-right: none; border-bottom: 1px solid var(--line); }
  .pillar:last-child { border-bottom: none; }
  .roadmap-groups { grid-template-columns: 1fr; }
  .roadmap-full { padding: 32px 20px 40px; }

  .site-header { padding: 16px 20px; }
  .nav-links { gap: 16px; }
  .nav-links a:not(.nav-github):not(.is-active) { display: none; }

  .hero { padding: 40px 20px 36px; }
  .hero h1 { font-size: 32px; }
  .pillar, .arch-col, .roadmap-col { padding: 28px 20px; }
  .cta { padding: 28px 20px; }
  .updates-header { padding: 36px 20px 24px; }
  .updates-list { padding: 4px 20px 0; }
  .update-row { flex-direction: column; gap: 8px; }
  .update-date { padding-top: 0; }
  .article-wrap { padding: 36px 20px 32px; }
  .site-footer { padding: 16px 20px; }
}

/* --- Print --- */
@media print {
  body { background: #fff; }
  .skip-link, .site-header, .site-footer, .back, .nav-links { display: none; }
  .wrap { max-width: 100%; padding: 0; border: none; }
}