body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  margin: 0;
  background: #f6f7fb;
  color: #111;
}
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
}
.site-header {
  background: white;
  border-bottom: 1px solid #e8e8ee;
}
.nav {
  max-width: 900px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: 700;
  text-decoration: none;
  color: inherit;
}
.links a {
  margin-left: 14px;
  text-decoration: none;
  color: #333;
}
.links a:hover {
  text-decoration: underline;
}
.card {
  background: white;
  border: 1px solid #e8e8ee;
  border-radius: 10px;
  padding: 16px;
  margin-top: 16px;
}
.form label {
  display: block;
  margin-bottom: 12px;
}
input, textarea {
  width: 100%;
  margin-top: 6px;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 8px;
  box-sizing: border-box;
}
button {
  padding: 10px 14px;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
.success {
  border-color: #b7f0c3;
  background: #f0fff4;
}
.site-footer {
  padding: 24px;
  text-align: center;
  color: #666;
}