*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family:
    system-ui,
    -apple-system,
    sans-serif;
  background: #fafafa;
  color: #222;
  line-height: 1.7;
}

.intro {
  max-width: 900px;
  margin: 10rem auto 8rem;
  padding: 0 1.5rem;
}

.intro h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  text-align: center;
}

.intro p {
  font-size: 1.05rem;
  color: #555;
}

.intro p + p {
  margin-top: 1.25rem;
}

.intro ul {
  margin: 0.75rem 0 1.25rem 1.25rem;
  color: #555;
  font-size: 1.05rem;
}

.intro li {
  margin-bottom: 0.5rem;
}

.intro hr {
  border: none;
  border-top: 1px solid #ddd;
  margin: 2rem 0;
}

.signup-form label {
  display: block;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.signup-row {
  display: flex;
  gap: 0.5rem;
}

.signup-row input {
  flex: 1;
  padding: 0.6rem 0.85rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  background: #fff;
  color: #222;
}

.signup-row input:focus {
  outline: none;
  border-color: #888;
}

.signup-row button {
  padding: 0.6rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 4px;
  background: #222;
  color: #fff;
  cursor: pointer;
}

.signup-row button:hover {
  background: #444;
}