.signup-main {
  width: 100%;
  max-width: min(640px, 100%);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3rem) var(--gf-section-x) 4rem;
  box-sizing: border-box;
  flex: 1;
}

.signup-card {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  background: #fff;
  border: 1px solid var(--gf-border);
  border-radius: var(--gf-radius-lg);
  padding: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 1.5rem;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.06);
}

.signup-card h1 {
  margin: 0 0 0.35rem;
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--gf-text);
}

.signup-subtitle {
  margin: 0 0 1.5rem;
  font-size: var(--text-base);
  color: var(--gf-text-muted);
  line-height: 1.55;
}

.signup-muted {
  margin: 0 0 1rem;
  font-size: var(--text-md);
  color: #6b7280;
}

.signup-form .form-field,
.signup-form .form-error {
  margin-bottom: 1rem;
}

.signup-form label.form-field {
  display: block;
}

.form-field span:first-child {
  display: block;
  margin-bottom: 0.25rem;
  font-size: var(--text-md);
  font-weight: 500;
  color: #374151;
}

.form-field input {
  width: 100%;
  padding: 0.55rem 0.8rem;
  font-size: var(--text-base);
  border: 1px solid #d1d5db;
  border-radius: var(--gf-radius-sm);
  box-sizing: border-box;
}

.form-field input:focus {
  outline: none;
  border-color: var(--gf-primary);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.field-error {
  display: block;
  margin-top: 0.25rem;
  font-size: var(--text-sm);
  color: #dc2626;
}

.form-hint {
  display: block;
  margin-top: 0.35rem;
  font-size: var(--text-sm);
  color: var(--gf-text-subtle);
  line-height: 1.45;
}

.form-error {
  font-size: var(--text-md);
  color: #dc2626;
}

.form-error[hidden] {
  display: none !important;
}

.form-error.success {
  color: #059669;
}

.btn-block {
  width: 100%;
  margin-top: 0.5rem;
}

.tier-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.tier-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--gf-border);
  border-radius: var(--gf-radius-sm);
  cursor: pointer;
}

.tier-option:has(input:checked) {
  border-color: var(--gf-primary);
  background: var(--gf-primary-soft);
}

.tier-option input {
  margin: 0;
}

.tier-label {
  flex: 1;
  font-weight: 500;
  color: var(--gf-text);
}

.tier-price {
  font-weight: 600;
  color: var(--gf-primary);
}

#checkout-container {
  min-height: 400px;
}

.signup-back {
  text-align: center;
  margin: 0;
  font-size: var(--text-md);
}

.signup-back a {
  color: var(--gf-text-muted);
  text-decoration: none;
}

.signup-back a:hover {
  color: var(--gf-text);
  text-decoration: underline;
}

.signup-step {
  display: block;
}

.signup-step[hidden] {
  display: none !important;
}

.password-field {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.password-field input {
  flex: 1;
}

.password-toggle {
  padding: 0.4rem 0.75rem;
  font-size: var(--text-sm);
  border-radius: 999px;
  border: none;
  cursor: pointer;
  background: var(--gf-primary);
  color: #ffffff;
  white-space: nowrap;
}

.password-toggle:hover {
  background: var(--gf-primary-hover);
}

@media (max-width: 639px) {
  .signup-card {
    padding: 1.5rem 1.25rem;
  }
}