:root {
  --bg: #f7f6f4;
  --surface: #ffffff;
  --ink: #0d0d0f;
  --text-secondary: #5f5e5a;
  --border: rgba(13, 13, 15, 0.08);
  --radius: 16px;
  --max-width: 760px;
}

* {
  box-sizing: border-box;
}

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

a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
}

a:hover {
  border-bottom-color: var(--ink);
}

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: block;
}

.brand span {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}

nav.site a {
  margin-left: 20px;
  border-bottom: none;
  font-size: 14px;
  color: var(--text-secondary);
}

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px 80px;
}

.hero {
  padding: 40px 0 24px;
}

.hero h1 {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

.hero p {
  font-size: 17px;
  color: var(--text-secondary);
  margin: 0;
  max-width: 520px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}

.card h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 6px;
}

.card p {
  margin: 0 0 8px;
  color: var(--text-secondary);
  font-size: 15px;
}

.card p:last-child {
  margin-bottom: 0;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 600px) {
  .grid {
    grid-template-columns: 1fr;
  }
  header.site {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  nav.site a {
    margin-left: 0;
    margin-right: 16px;
  }
}

.btn {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 12px 20px;
  font-weight: 600;
  font-size: 15px;
}

.btn:hover {
  opacity: 0.85;
  border-bottom: none;
}

footer.site {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 60px;
  color: var(--text-secondary);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.legal h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 32px 0 8px;
}

.legal h2:first-of-type {
  margin-top: 8px;
}

.legal p {
  color: var(--text-secondary);
  font-size: 15px;
  margin: 0 0 4px;
}

.updated {
  color: var(--text-secondary);
  font-size: 13px;
  margin-bottom: 24px;
}

details {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

details:first-child {
  border-top: 1px solid var(--border);
}

summary {
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary:before {
  content: "+";
  display: inline-block;
  width: 16px;
  color: var(--text-secondary);
}

details[open] summary:before {
  content: "\2212";
}

details p {
  margin: 10px 0 0 16px;
  color: var(--text-secondary);
  font-size: 14px;
}