/* OSI Holding Company — landing page styles. Plain static CSS, no dependencies. */

:root {
  --paper: #f8f7f4;
  --paper-alt: #f1efe9;
  --card: #ffffff;
  --ink: #151a23;
  --muted: #5c6470;
  --line: #e2ded4;
  --accent: #8a5a1e;
  --accent-ink: #6e4715;
  --serif: Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.wrap.narrow { max-width: 720px; }

/* Header */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 0.04em;
  background: var(--ink);
  color: var(--paper);
  padding: 6px 10px;
  border-radius: 3px;
}

.brand-name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.site-nav { display: flex; gap: 28px; }

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.site-nav a:hover { color: var(--ink); }

/* Hero */

.hero {
  padding: 96px 0 80px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-ink);
  margin: 0 0 20px;
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 56px;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
  max-width: 16em;
}

.lede {
  font-size: 19px;
  color: var(--muted);
  margin: 0;
  max-width: 34em;
}

/* Sections */

.section { padding: 72px 0; }

.section-alt {
  background: var(--paper-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 34px;
  margin: 0 0 16px;
  letter-spacing: -0.005em;
}

.section p { margin: 0 0 12px; }

/* Venture cards */

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 36px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 36px 32px;
}

.card h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 26px;
  margin: 0 0 6px;
}

.card-tag {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-ink);
  margin: 0 0 14px;
}

.card p:last-child { color: var(--muted); margin-bottom: 0; }

/* Contact */

.contact-line { font-size: 18px; }

.contact-line a {
  color: var(--accent-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.tbd {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-ink);
  border: 1px dashed var(--accent);
  border-radius: 3px;
  padding: 2px 8px;
  margin-left: 8px;
  vertical-align: middle;
}

.note {
  font-size: 14px;
  color: var(--muted);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
}

.site-footer p {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

/* Responsive */

@media (max-width: 720px) {
  .hero { padding: 64px 0 56px; }

  .hero h1 { font-size: 38px; }

  .lede { font-size: 17px; }

  .section { padding: 52px 0; }

  .section h2 { font-size: 28px; }

  .cards { grid-template-columns: 1fr; }

  .brand-name { display: none; }

  .site-nav { gap: 20px; }
}