body {
  padding: 30px 24px;
}

.header {
  text-align: center;
  margin-bottom: 28px;
}

.header h1 {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #1d1d1f;
}

.howto-toggle {
  display: block;
  background: none;
  border: 1.5px solid #d2d2d7;
  color: #3a3a3c;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  margin: 32px auto 12px;
  transition: border-color 0.15s, color 0.15s;
  font-family: inherit;
}

.howto-toggle:hover {
  border-color: #0071e3;
  color: #0071e3;
}

.howto-content {
  display: none;
  max-width: 1200px;
  margin: 0 auto;
  background: #fff;
  border-radius: 16px;
  padding: 24px;
  font-size: 14px;
  line-height: 1.7;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.howto-content.open {
  display: block;
}

.howto-section {
  padding-top: 16px;
  margin-top: 16px;
  border-top: 1px solid #f5f5f7;
}

.howto-section:first-child {
  padding-top: 0;
  margin-top: 0;
  border-top: none;
}

.howto-content h3 {
  font-size: 14px;
  color: #1d1d1f;
  font-weight: 600;
  margin-bottom: 8px;
}

.howto-content p {
  color: #6e6e73;
}

.howto-content ul {
  padding-left: 20px;
  color: #6e6e73;
}

.howto-content li {
  margin-bottom: 4px;
}

.site-footer {
  max-width: 1200px;
  margin: 24px auto 0;
  padding: 16px 0 32px;
  border-top: 1px solid #d2d2d7;
  text-align: center;
  font-size: 12px;
  color: #6e6e73;
}

.site-footer nav {
  margin-bottom: 8px;
}

.site-footer a {
  color: #6e6e73;
  text-decoration: none;
  margin: 0 10px;
}

.site-footer a:hover {
  color: #0071e3;
}