:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --text: #1a2332;
  --muted: #5c6b80;
  --accent: #21b66b;
  --accent-hover: #1a9a59;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(26, 35, 50, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--accent-hover);
  text-decoration: none;
}

a:hover {
  color: var(--accent);
  text-decoration: underline;
}

header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
}

.brand {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
  color: var(--accent);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.9375rem;
}

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

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  text-decoration: none;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.hero {
  padding: 2rem 0 2.5rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  line-height: 1.2;
  margin: 0 0 1rem;
}

.lead {
  font-size: 1.125rem;
  color: var(--muted);
  max-width: 42rem;
  margin: 0 0 1.5rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.btn {
  display: inline-block;
  padding: 0.625rem 1.25rem;
  border-radius: 0.5rem;
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  text-decoration: none;
}

.btn-secondary {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  box-shadow: var(--shadow);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-hover);
  text-decoration: none;
}

.btn-disabled {
  background: #eef2f7;
  color: var(--muted);
  border: 1px solid var(--border);
  cursor: default;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9375rem;
}

h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.375rem;
}

h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.0625rem;
}

p, ul, ol {
  margin: 0 0 1rem;
}

ul, ol {
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.35rem;
}

.note {
  background: #eefbf3;
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1rem;
  margin: 1.25rem 0;
  color: var(--muted);
  font-size: 0.9375rem;
}

footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 2rem 1.25rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}

@media (max-width: 600px) {
  main {
    padding-top: 1.5rem;
  }

  .nav {
    flex-direction: column;
    align-items: flex-start;
  }
}