:root {
  --green-700: #166534;
  --green-600: #15803d;
  --green-50: #f0fdf4;
  --gray-900: #111827;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --white: #ffffff;
  --shadow: 0 1px 3px rgba(17, 24, 39, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  max-width: 860px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--gray-900);
  font-weight: 700;
  font-size: 1.15rem;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
}

.nav-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--gray-700);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 6px 2px;
}

.nav-links a:hover {
  color: var(--green-700);
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 20px 64px;
}

.hero {
  margin-bottom: 36px;
}

h1 {
  font-size: 1.9rem;
  line-height: 1.25;
  margin-bottom: 10px;
}

.meta {
  color: var(--gray-500);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

section {
  margin-bottom: 32px;
}

h2 {
  font-size: 1.3rem;
  color: var(--green-700);
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--green-50);
}

h3 {
  font-size: 1.05rem;
  margin: 16px 0 8px;
}

p {
  margin-bottom: 12px;
  color: var(--gray-700);
}

ul, ol {
  margin: 0 0 12px 22px;
  color: var(--gray-700);
}

li {
  margin-bottom: 8px;
}

a {
  color: var(--green-600);
}

a:hover {
  text-decoration: none;
}

.callout {
  background: var(--green-50);
  border: 1px solid #bbf7d0;
  border-radius: 10px;
  padding: 16px 18px;
  margin: 20px 0;
}

.callout p {
  margin: 0;
}

.card {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  padding: 18px 20px;
  margin: 16px 0;
}

.steps li {
  margin-bottom: 14px;
}

.steps strong {
  color: var(--gray-900);
}

.badge {
  display: inline-block;
  background: var(--green-600);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  vertical-align: middle;
  margin-left: 8px;
}

footer {
  border-top: 1px solid var(--gray-200);
  background: var(--gray-100);
}

.footer-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--gray-500);
  font-size: 0.9rem;
}

.footer-inner a {
  color: var(--gray-500);
  text-decoration: underline;
}

@media (max-width: 480px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }

  h1 {
    font-size: 1.55rem;
  }

  main {
    padding-top: 28px;
  }
}