:root {
  --brand: #8B5CF6;
  --brand-dark: #7C3AED;
  --ink: #1B1F24;
  --muted: #616E7C;
  --line: #E4ECFA;
  --bg: #FFFFFF;
  --card: #F3F7FF;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
}

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

header.site .wrap {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  font-weight: 800;
  font-size: 22px;
  color: var(--brand-dark);
  text-decoration: none;
  margin-right: auto;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  margin-right: 10px;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  margin-left: 20px;
}

nav a:hover, nav a.active {
  color: var(--brand-dark);
}

.hero {
  text-align: center;
  padding: 64px 24px 48px;
}

.hero h1 {
  font-size: 40px;
  margin: 0 0 12px;
}

.hero p {
  color: var(--muted);
  font-size: 18px;
  margin: 0 0 28px;
}

.btn {
  display: inline-block;
  background: var(--brand-dark);
  color: #fff;
  padding: 12px 28px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 600;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  padding-bottom: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.card p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
}

.card a {
  color: var(--brand-dark);
  font-weight: 600;
  text-decoration: none;
}

article.doc {
  padding-top: 40px;
  padding-bottom: 24px;
}

article.doc h1 {
  font-size: 32px;
  margin: 0 0 4px;
}

article.doc .meta {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 28px;
}

article.doc h2 {
  font-size: 20px;
  margin: 32px 0 8px;
  color: var(--brand-dark);
}

article.doc p, article.doc li {
  font-size: 16px;
}

article.doc ul {
  padding-left: 24px;
}

article.doc a {
  color: var(--brand-dark);
}

.contact-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  margin: 32px 0 64px;
}

footer.site {
  border-top: 1px solid var(--line);
  padding: 24px 0 48px;
  color: var(--muted);
  font-size: 14px;
}

footer.site .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
  justify-content: center;
  text-align: center;
}

footer.site a {
  color: var(--muted);
  text-decoration: none;
}

footer.site a:hover {
  color: var(--brand-dark);
}

@media (max-width: 600px) {
  .hero h1 { font-size: 30px; }
  nav a { margin-left: 12px; font-size: 14px; }
}