:root {
  --primary: #3B82F6;
  --primary-dark: #2563EB;
  --text: #1F2937;
  --text-secondary: #6B7280;
  --bg: #FFFFFF;
  --bg-alt: #F9FAFB;
  --border: #E5E7EB;
  --radius: 12px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary-dark);
}

/* ── Navigation ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}

.nav-inner {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo {
  height: 32px;
  width: 32px;
  border-radius: 8px;
  object-fit: cover;
}

.nav-brand span {
  color: var(--primary);
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
  background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 50%, #EFF6FF 100%);
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero h1 span {
  color: var(--primary);
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 32px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: #fff;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}

.hero-cta:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
}

/* ── Features ── */
.features {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
}

.features h2 {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 40px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Content Pages ── */
.content {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.content h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.content .last-updated {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 32px;
}

.content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
  color: var(--text);
}

.content p,
.content li {
  font-size: 0.95rem;
  color: #374151;
  margin-bottom: 12px;
}

.content ul,
.content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.content li {
  margin-bottom: 6px;
}

.content strong {
  font-weight: 600;
}

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
}

.footer p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 12px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--primary);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .nav-links {
    gap: 16px;
  }

  .nav-links a {
    font-size: 0.8rem;
  }

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