:root {
  --bg-paper: #F4F2EC;
  --bg-surface: #FCFBF8;
  --ink-primary: #121417;
  --ink-secondary: #495057;
  --ink-muted: #6C757D;
  --border-hairline: #D8D4C8;
  --border-strong: #121417;
  --accent-signal: #1A3A5C;
  --accent-signal-hover: #10253C;
  --accent-warm: #B84326;
}

*, *::before, *::after {
  box-sizing: border-box;
}

::selection {
  background-color: #1A3A5C;
  color: #FCFBF8;
}

::-moz-selection {
  background-color: #1A3A5C;
  color: #FCFBF8;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: #9A9587 #F4F2EC;
}

body {
  margin: 0;
  background-color: var(--bg-paper);
  color: var(--ink-primary);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

a {
  color: var(--accent-signal);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--accent-signal-hover);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent-warm);
  outline-offset: 3px;
}

.shell {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

.topbar {
  border-bottom: 1px solid var(--border-hairline);
  background-color: var(--bg-surface);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
  color: var(--ink-primary);
  text-decoration: none;
}

.brand svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 0.92rem;
}

.nav-links a {
  color: var(--ink-secondary);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--ink-primary);
  text-decoration: underline;
}

.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--border-hairline);
}

.hero-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 48px;
  align-items: start;
}

h1 {
  margin: 0 0 20px;
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 700;
}

.lead {
  margin: 0;
  font-size: 1.125rem;
  color: var(--ink-secondary);
  max-width: 58ch;
}

.spec-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  padding: 24px;
}

.spec-box dl {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.spec-box dt {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

.spec-box dd {
  margin: 2px 0 0;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-primary);
}

.section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border-hairline);
}

h2 {
  margin: 0 0 24px;
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}

h3 {
  margin: 28px 0 10px;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.ledger {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
}

.ledger th,
.ledger td {
  text-align: left;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-hairline);
  vertical-align: top;
}

.ledger th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
  background-color: #EFECE4;
}

.ledger tr:last-child td {
  border-bottom: none;
}

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88rem;
}

.two-col {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 40px;
}

.prose {
  max-width: 70ch;
  padding: 56px 0;
}

.prose p,
.prose li {
  color: var(--ink-secondary);
}

.footer {
  padding: 44px 0 64px;
  font-size: 0.9rem;
  color: var(--ink-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 32px;
}

@media (max-width: 780px) {
  .hero-grid,
  .two-col,
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .ledger,
  .ledger thead,
  .ledger tbody,
  .ledger tr,
  .ledger td {
    display: block;
    width: 100%;
  }

  .ledger thead {
    display: none;
  }

  .ledger tr {
    border-bottom: 1px solid var(--border-hairline);
    padding: 8px 0;
  }

  .ledger td {
    border-bottom: none;
    padding: 8px 16px;
  }
}