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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #1a1a1a;
  background: #fff;
  line-height: 1.6;
}

header {
  text-align: center;
  padding: 3rem 1.5rem 2rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: #25D366;
}

.tagline {
  font-size: 1.2rem;
  color: #555;
  margin-top: 0.5rem;
}

main {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.signup {
  margin-bottom: 3rem;
}

.field {
  margin-bottom: 1rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}

.domain-input {
  display: flex;
  align-items: center;
  border: 2px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.domain-input:focus-within {
  border-color: #25D366;
}

.domain-input input {
  flex: 1;
  border: none;
  padding: 0.75rem;
  font-size: 1rem;
  outline: none;
  min-width: 0;
}

.domain-suffix {
  padding: 0.75rem;
  background: #f5f5f5;
  color: #777;
  font-size: 0.9rem;
  white-space: nowrap;
}

input[type="tel"] {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  border: 2px solid #ddd;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s;
}

input[type="tel"]:focus {
  border-color: #25D366;
}

button[type="submit"] {
  width: 100%;
  padding: 0.85rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  background: #25D366;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  margin-top: 0.5rem;
  transition: background 0.2s;
}

button[type="submit"]:hover {
  background: #1ea952;
}

button[type="submit"]:disabled {
  background: #aaa;
  cursor: not-allowed;
}

.hint {
  text-align: center;
  font-size: 0.85rem;
  color: #888;
  margin-top: 0.5rem;
}

.result {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
  font-size: 0.95rem;
}

.result.success {
  background: #e6f9ee;
  color: #1a7a3a;
}

.result.error {
  background: #fde8e8;
  color: #b91c1c;
}

.hidden {
  display: none;
}

.steps {
  margin-bottom: 3rem;
}

.steps h2 {
  text-align: center;
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
}

.steps-grid {
  display: grid;
  gap: 1.5rem;
}

.step {
  text-align: center;
}

.step-number {
  width: 40px;
  height: 40px;
  line-height: 40px;
  border-radius: 50%;
  background: #25D366;
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 auto 0.5rem;
}

.step h3 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.step p {
  font-size: 0.9rem;
  color: #666;
}

footer {
  text-align: center;
  padding: 2rem 1.5rem;
  border-top: 1px solid #eee;
  font-size: 0.85rem;
}

footer a {
  color: #888;
  text-decoration: none;
  margin: 0 0.75rem;
}

footer a:hover {
  color: #25D366;
}