body {
  font-family: 'Segoe UI', 'Arial', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background: linear-gradient(135deg, #f8fafc 0%, #e9ecef 100%);
  color: #222;
  margin: 0;
  padding: 0;
  min-height: 100vh;
}
nav {
  background: #222;
  padding: 1.2em 0;
  text-align: center;
  font-size: 1.05em;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
nav a {
  color: #f8fafc;
  text-decoration: none;
  margin: 0 0.7em;
  padding: 0.2em 0.5em;
  border-radius: 2px;
  transition: background 0.2s, color 0.2s;
}
nav a:hover {
  background: #f8fafc;
  color: #222;
}
main {
  max-width: 720px;
  margin: 2.5em auto;
  padding: 2em 2em 1.5em 2em;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 24px rgba(34,34,34,0.07);
}
main h1 {
  font-size: 2.2em;
  font-weight: 700;
  margin-top: 0.5em;
  margin-bottom: 0.7em;
  letter-spacing: 0.01em;
}
main h2 {
  font-size: 1.4em;
  font-weight: 600;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}
main h3 {
  font-size: 1.15em;
  font-weight: 500;
  margin-top: 1.2em;
  margin-bottom: 0.3em;
}
footer {
  text-align: center;
  padding: 2em 0 1em 0;
  font-size: 0.95em;
  color: #555;
  background: #222;
  margin-top: 2em;
  letter-spacing: 0.01em;
}
form label {
  display: block;
  margin-top: 1.2em;
  font-weight: 500;
  color: #222;
}
form input, form textarea {
  width: 100%;
  padding: 0.7em;
  margin-top: 0.5em;
  border: 1px solid #d1d5db;
  border-radius: 4px;
  font-size: 1em;
  background: #f8fafc;
  transition: border 0.2s;
}
form input:focus, form textarea:focus {
  border-color: #222;
  outline: none;
}
form button {
  margin-top: 1.2em;
  padding: 0.8em 2.2em;
  background: #222;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1em;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: background 0.2s;
}
form button:hover {
  background: #444;
}