:root {
  --bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

.narrow {
  max-width: 720px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: #fff;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 600;
  color: var(--text);
}

.nav a {
  margin-left: 20px;
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
}

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

.hero {
  padding: 80px 0 60px;
  text-align: center;
}

.hero h1 {
  font-size: 40px;
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--muted);
}

.section {
  padding: 60px 0;
}

.section-alt {
  background: #f9fafb;
}

h2 {
  margin-bottom: 20px;
  font-size: 28px;
}

h3 {
  margin-top: 30px;
  margin-bottom: 10px;
  font-size: 20px;
}

p {
  margin-bottom: 16px;
}

.button {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
}

.button-primary {
  background: var(--primary);
  color: #fff;
}

.button-primary:hover {
  background: var(--primary-dark);
}

.button-ghost {
  border: 1px solid var(--border);
}

.subscribe-form {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.subscribe-form input {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
  font-size: 14px;
  color: var(--muted);
  text-align: center;
}

.disclaimer {
  margin-top: 10px;
  font-size: 12px;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 28px;
  }

  .nav {
    display: none;
  }

  .subscribe-form {
    flex-direction: column;
  }
}