:root {
  --oi-primary: #0b4f8a;
  --oi-primary-dark: #083b68;
  --oi-accent: #e87722;
  --oi-bg: #fafafa;
  --oi-text: #1a1a1a;
  --oi-text-muted: #5a5a5a;
  --oi-surface: #ffffff;
  --oi-border: #e0e0e0;
  --oi-banner-bg: #fff3cd;
  --oi-banner-border: #f0ad4e;
  --oi-banner-text: #664d03;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--oi-text);
  background: var(--oi-bg);
  line-height: 1.55;
}

.proposal-banner {
  background: var(--oi-banner-bg);
  border-bottom: 2px solid var(--oi-banner-border);
  color: var(--oi-banner-text);
  padding: 12px 24px;
  text-align: center;
  font-weight: 600;
  font-size: 14px;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.proposal-banner strong { font-weight: 700; }
.proposal-banner .version {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: rgba(0,0,0,0.06);
  padding: 2px 8px;
  border-radius: 4px;
  margin-left: 8px;
}

.site-header {
  background: var(--oi-primary);
  color: white;
  padding: 48px 24px 40px;
  text-align: center;
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.site-header .tagline {
  margin: 0;
  opacity: 0.85;
  font-size: 17px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 48px 24px;
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0 48px;
}

.audience-card {
  background: var(--oi-surface);
  border: 1px solid var(--oi-border);
  border-radius: 8px;
  padding: 24px;
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

.audience-card:hover {
  border-color: var(--oi-primary);
  box-shadow: 0 4px 14px rgba(11, 79, 138, 0.10);
}

.audience-card h3 {
  margin: 0 0 12px;
  color: var(--oi-primary);
  font-size: 18px;
}

.audience-card p { margin: 0 0 12px; color: var(--oi-text-muted); font-size: 15px; }

.audience-card ul {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--oi-text-muted);
  font-size: 14px;
}

.audience-card ul li { margin-bottom: 4px; }

.audience-card code {
  background: var(--oi-bg);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 13px;
  color: var(--oi-primary-dark);
}

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 32px 0;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 10px rgba(0,0,0,0.10); }

.btn-primary { background: var(--oi-primary); color: white; }
.btn-primary:hover { background: var(--oi-primary-dark); }

.btn-secondary {
  background: var(--oi-surface);
  color: var(--oi-primary);
  border: 1px solid var(--oi-primary);
}

section { margin: 40px 0; }

section h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 16px;
  color: var(--oi-text);
  border-bottom: 2px solid var(--oi-accent);
  padding-bottom: 8px;
  display: inline-block;
}

section h3 {
  font-size: 17px;
  margin: 24px 0 8px;
  color: var(--oi-primary-dark);
}

section p { margin: 0 0 12px; color: var(--oi-text); }

.pill {
  display: inline-block;
  background: var(--oi-primary);
  color: white;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.pill-secondary {
  background: var(--oi-bg);
  color: var(--oi-primary);
  border: 1px solid var(--oi-primary);
}

.footer {
  border-top: 1px solid var(--oi-border);
  padding: 32px 24px;
  text-align: center;
  color: var(--oi-text-muted);
  font-size: 13px;
}

.footer a { color: var(--oi-primary); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.spec-frame {
  height: calc(100vh - 48px);
  border: 0;
  width: 100%;
}