/* Shared brand tokens + base + primitives for ledgerproofhq.io subpages.
   Source of truth for additions outside index.html — kept in sync with the
   inline :root block at the top of index.html. When updating either, update
   both. The duplication is intentional: index.html is large and load-critical
   so it keeps its CSS inline; smaller subpages link this file for cacheability. */

:root {
  /* Surface */
  --bg: #FAF7F0;
  --bg-alt: #F2EEE2;
  --surface: #FFFFFF;
  --line: #E8E2D5;
  --line-strong: #D7CFB8;

  /* Brand */
  --navy: #081424;
  --navy-2: #0F1E36;
  --navy-3: #16294A;
  --mint: #20E898;
  --mint-2: #4DEFAB;
  --mint-deep: #15B380;
  --mint-tint: rgba(32, 232, 152, 0.10);

  /* Type */
  --ink: #0F1E36;
  --ink-soft: #2C394D;
  --muted: #5C6B76;
  --muted-2: #8898A4;
  --bone: #F0EFEC;

  /* Type families */
  --display: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Inter", "Söhne", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;

  /* Amber/warning */
  --amber: #B45309;
  --amber-bg: #FFFBEB;
  --amber-line: #FDE68A;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font: 17px/1.65 var(--sans);
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--mint); color: var(--navy); }

h1, h2, h3, h4, h5 { font-family: var(--display); font-weight: 600; letter-spacing: -0.02em; margin: 0; color: var(--navy); }
p { margin: 0 0 1em; }
a { color: var(--navy); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; transition: color 0.15s; }
a:hover { color: var(--mint-deep); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 32px; }
.narrow { max-width: 760px; margin: 0 auto; }
.prose { max-width: 680px; margin: 0 auto; }
.prose p { font-size: 18px; line-height: 1.7; color: var(--ink-soft); margin-bottom: 1.25em; }
.prose h2 { font-size: 28px; margin-top: 2em; margin-bottom: 0.6em; }
.prose h3 { font-size: 22px; margin-top: 1.5em; margin-bottom: 0.4em; }
.prose ul { padding-left: 1.4em; color: var(--ink-soft); }
.prose li { margin-bottom: 0.5em; line-height: 1.6; }
.prose strong { color: var(--navy); font-weight: 600; }
.prose code { font-family: var(--mono); font-size: 0.9em; background: var(--bg-alt); padding: 1px 6px; border-radius: 4px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 16px 28px;
  border-radius: 999px;
  font: 600 16px/1 var(--sans);
  text-decoration: none;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--navy); color: var(--mint); border-color: var(--navy); }
.btn-primary:hover { background: var(--navy-3); transform: translateY(-1px); box-shadow: 0 8px 24px -10px rgba(8,20,36,0.4); }
.btn-secondary { background: transparent; color: var(--navy); border-color: var(--navy); }
.btn-secondary:hover { background: var(--navy); color: var(--mint); }
.btn-ghost { background: transparent; color: var(--navy); border-color: var(--line-strong); }
.btn-ghost:hover { background: white; border-color: var(--navy); }
.btn-mint { background: var(--mint); color: var(--navy); border-color: var(--mint); }
.btn-mint:hover { background: var(--mint-2); border-color: var(--mint-2); transform: translateY(-1px); }
.btn-lg { padding: 20px 36px; font-size: 17px; }
.btn-arrow::after { content: "→"; font-size: 18px; transition: transform 0.15s; }
.btn-arrow:hover::after { transform: translateX(3px); }

/* Header */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 247, 240, 0.85);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; padding: 20px 32px; }
.brand-mark { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark img { height: 200px; width: auto; display: block; border-radius: 8px; }
@media (max-width: 720px) { .brand-mark img { height: 96px; } }
.brand-mark:hover { opacity: 0.85; }
nav.primary { display: flex; gap: 36px; align-items: center; }
nav.primary a { color: var(--ink-soft); font-size: 15px; font-weight: 500; text-decoration: none; }
nav.primary a:hover { color: var(--navy); }
nav.primary .btn { padding: 10px 20px; font-size: 14px; }

/* Footer */
footer.site {
  margin-top: 96px;
  padding: 48px 0 64px;
  background: var(--navy);
  color: var(--bone);
  font-size: 14px;
}
footer.site a { color: var(--mint); text-decoration: none; }
footer.site a:hover { color: var(--mint-2); }
footer.site .cols { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; }
footer.site h4 { color: white; font-family: var(--sans); font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 16px; }
footer.site ul { list-style: none; padding: 0; margin: 0; line-height: 2; }
footer.site .legal { margin-top: 40px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.12); display: flex; justify-content: space-between; opacity: 0.7; font-size: 12px; }

/* Badge */
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px;
  background: white;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-transform: uppercase;
}
.badge::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--mint);
  box-shadow: 0 0 0 4px rgba(32,232,152,0.18);
}

/* Article page intros */
.page-hero {
  padding: 80px 0 48px;
  text-align: center;
}
.page-hero .eyebrow {
  font-size: 13px; font-weight: 600; color: var(--mint-deep);
  text-transform: uppercase; letter-spacing: 0.12em;
  margin-bottom: 16px;
}
.page-hero h1 {
  font-size: clamp(36px, 5vw, 60px); line-height: 1.08;
  max-width: 900px; margin: 0 auto 20px;
}
.page-hero .sub {
  font-size: 20px; line-height: 1.55; color: var(--ink-soft);
  max-width: 680px; margin: 0 auto;
}

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 28px; }
.card h3 { font-size: 20px; margin-bottom: 10px; }
.card p { font-size: 15px; color: var(--ink-soft); margin: 0; line-height: 1.55; }
.card .eyebrow { font-size: 11px; font-weight: 600; color: var(--mint-deep); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 14px; }

/* Spec callout (the small "10-second proof" we link inline) */
.verifier-callout {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 14px 22px;
  border: 1px solid var(--navy); border-radius: 999px;
  background: var(--navy); color: var(--mint);
  font-family: var(--mono); font-size: 14px; text-decoration: none;
  transition: all 0.15s;
}
.verifier-callout:hover { background: var(--navy-3); transform: translateY(-1px); }
.verifier-callout::before { content: "✓"; font-family: var(--sans); font-size: 16px; }

@media (max-width: 720px) {
  nav.primary { display: none; }
  .page-hero h1 { font-size: 36px; }
  footer.site .cols { grid-template-columns: 1fr 1fr; gap: 32px; }
}