:root {
  --brand: #2563eb;
  --brand-accent: #0ea5e9;
  --ink: #0f172a;
  --muted: #64748b;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e2e8f0;
  --max: 1080px;
  --radius: 12px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.brand { display: inline-flex; align-items: center; color: var(--ink); }
.brand-logo { display: block; width: auto; }

.nav-links a {
  color: var(--ink);
  text-decoration: none;
  margin-left: 24px;
  font-weight: 500;
}

.nav-links a:hover { color: var(--brand); }

/* Centered placeholder hero */
.hero-center {
  min-height: calc(100vh - 64px - 97px);
  display: flex;
  align-items: center;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  padding: 48px 0;
}

.hero-center h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.1;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.hero-logo { margin: 0 0 28px; }

.hero-logo-svg {
  display: inline-block;
  width: min(360px, 86vw);
  height: auto;
}

.lede {
  font-size: 1.2rem;
  color: var(--muted);
  margin: 0 0 24px;
}

.link {
  color: var(--brand);
  text-decoration: none;
  font-weight: 600;
}
.link:hover { text-decoration: underline; }

/* Sections */
.section { padding: 72px 0; }

.section h1 {
  font-size: 2rem;
  margin: 0 0 16px;
  letter-spacing: -0.01em;
}

.section p { color: var(--muted); font-size: 1.05rem; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e2e8f0;
    --muted: #94a3b8;
    --bg: #0f172a;
    --bg-alt: #1e293b;
    --border: #334155;
  }
  .site-header { background: rgba(15, 23, 42, 0.9); }
}