.smbt-brief-wrapper {
  max-width: 920px;
  margin: 0 auto;
  padding: 24px;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  box-shadow: 0 14px 40px rgba(15, 23, 42, 0.08);
}

.smbt-notice {
  margin-bottom: 18px;
  padding: 14px 16px;
  border-radius: 12px;
  font-weight: 600;
}

.smbt-notice--success {
  background: #ecfdf5;
  color: #166534;
}

.smbt-notice--error {
  background: #fef2f2;
  color: #991b1b;
}

.smbt-notice--hidden {
  display: none;
}

.smbt-step-indicator {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
}

.smbt-step-indicator__item {
  padding: 10px 12px;
  text-align: center;
  border-radius: 999px;
  background: #f3f4f6;
  color: #4b5563;
  font-size: 14px;
  font-weight: 600;
}

.smbt-step-indicator__item.is-active {
  background: #0f766e;
  color: #ffffff;
}

.smbt-step {
  display: none;
  gap: 18px;
}

.smbt-step.is-active {
  display: grid;
}

.smbt-step h3 {
  margin: 0;
  font-size: 24px;
}

.smbt-field {
  display: grid;
  gap: 8px;
}

.smbt-field > span,
.smbt-field legend {
  font-weight: 700;
  color: #111827;
}

.smbt-field input[type="text"],
.smbt-field input[type="email"],
.smbt-field input[type="url"],
.smbt-field select,
.smbt-field textarea,
.smbt-field input[type="file"] {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 15px;
  background: #ffffff;
}

.smbt-field--checkboxes {
  border: 0;
  padding: 0;
  margin: 0;
}

.smbt-checkbox-list {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.smbt-checkbox-list label,
.smbt-field--toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 12px;
  background: #f9fafb;
}

.smbt-helper {
  margin: 0;
  color: #6b7280;
}

.smbt-email-assets {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: 14px;
  background: #f8fafc;
  border: 1px solid #dbeafe;
  color: #1f2937;
}

.smbt-email-assets p,
.smbt-email-assets ul {
  margin: 0;
}

.smbt-email-assets ul {
  padding-left: 20px;
}

.smbt-conditional {
  display: none;
  gap: 16px;
  padding: 18px;
  border: 1px dashed #cbd5e1;
  border-radius: 14px;
  background: #f8fafc;
}

.smbt-conditional.is-visible {
  display: grid;
}

.smbt-conditional--social {
  margin-top: 4px;
}

.smbt-conditional--website {
  margin-top: 4px;
}

.smbt-summary {
  display: grid;
  gap: 10px;
  padding: 18px;
  border-radius: 14px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
}

.smbt-summary__row {
  padding-bottom: 10px;
  border-bottom: 1px solid #e5e7eb;
}

.smbt-summary__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.smbt-navigation {
  display: flex;
  justify-content: space-between;
  margin-top: 24px;
  gap: 12px;
}

.smbt-nav-button,
.smbt-submit {
  border: 0;
  border-radius: 999px;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

.smbt-nav-button {
  background: #e5e7eb;
  color: #111827;
}

.smbt-nav-button--primary,
.smbt-submit {
  background: linear-gradient(135deg, #0f766e, #115e59);
  color: #ffffff;
}

.smbt-nav-button[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

@media (max-width: 768px) {
  .smbt-brief-wrapper {
    padding: 18px;
  }

  .smbt-step-indicator {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .smbt-navigation {
    flex-direction: column;
  }

  .smbt-nav-button,
  .smbt-submit {
    width: 100%;
  }

  .smbt-field input[type="text"],
  .smbt-field input[type="email"],
  .smbt-field input[type="url"],
  .smbt-field select,
  .smbt-field textarea {
    font-size: 16px;
  }
}