:root {
    --text: #0f172a;
    --muted: #475569;
    --border: #e2e8f0;
    --bg: #ffffff;
    --panel: #f8fafc;
    --link: #2563eb;
    --blue: #1d4ed8;
    --blue-dark: #1e40af;
    --success: #166534;
    --success-bg: #f0fdf4;
    --success-border: #86efac;
    --max: 760px;
  }

  * {
    box-sizing: border-box;
  }

  .sms-optin-page {
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
  }

  .sms-optin-page .wrap {
    max-width: var(--max);
    margin: 0 auto;
    padding: 28px 18px;
  }

  .sms-optin-page .intro {
    border-bottom: 1px solid var(--border);
    background: linear-gradient(
      180deg,
      #f8fafc 0%,
      #ffffff 100%
    );
  }

  .sms-optin-page h1 {
    margin: 0 0 10px 0;
    font-size: 32px;
    line-height: 1.2;
    letter-spacing: -0.02em;
  }

  .sms-optin-page h2 {
    margin: 0 0 10px 0;
    font-size: 22px;
    line-height: 1.3;
  }

  .sms-optin-page p {
    margin: 10px 0;
  }

  .sms-optin-page .subtitle {
    margin: 0;
    color: var(--muted);
    font-size: 16px;
  }

  .sms-optin-page .card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 22px;
    margin: 20px 0;
  }

  .sms-optin-page .field {
    margin-bottom: 20px;
  }

  .sms-optin-page label.field-label {
    display: block;
    margin-bottom: 7px;
    font-weight: 700;
  }

  .sms-optin-page input[type="text"],
  .sms-optin-page input[type="email"],
  .sms-optin-page input[type="tel"] {
    width: 100%;
    padding: 12px 13px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    background: #ffffff;
    color: var(--text);
    font-size: 16px;
    font-family: Arial, Helvetica, sans-serif;
  }

  .sms-optin-page input[type="text"]:focus,
  .sms-optin-page input[type="email"]:focus,
  .sms-optin-page input[type="tel"]:focus {
    outline: 2px solid rgba(37, 99, 235, 0.2);
    border-color: var(--link);
  }

  .sms-optin-page .help-text {
    display: block;
    margin-top: 5px;
    color: var(--muted);
    font-size: 13px;
  }

  .sms-optin-page fieldset {
    border: 0;
    padding: 0;
    margin: 0;
  }

  .sms-optin-page legend {
    font-weight: 700;
    margin-bottom: 12px;
    font-size: 18px;
  }

  .sms-optin-page .checkbox-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  .sms-optin-page .checkbox-row:last-child {
    border-bottom: 0;
  }

  .sms-optin-page .checkbox-row input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin: 3px 0 0 0;
    flex: 0 0 auto;
    cursor: pointer;
  }

  .sms-optin-page .checkbox-row label {
    cursor: pointer;
  }

  .sms-optin-page .disclosure {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px;
    margin-top: 22px;
    font-size: 14px;
    color: #334155;
  }

  .sms-optin-page .disclosure p {
    margin: 0;
  }

  .sms-optin-page a {
    color: var(--link);
    text-decoration: none;
  }

  .sms-optin-page a:hover {
    text-decoration: underline;
  }

  .sms-optin-page .submit-area {
    margin-top: 24px;
  }

  .sms-optin-page button {
    appearance: none;
    border: 0;
    border-radius: 9px;
    background: var(--blue);
    color: #ffffff;
    font-size: 16px;
    font-weight: 700;
    padding: 13px 22px;
    cursor: pointer;
    width: 100%;
  }

  .sms-optin-page button:hover {
    background: var(--blue-dark);
  }

  .sms-optin-page button:focus {
    outline: 3px solid rgba(37, 99, 235, 0.25);
    outline-offset: 2px;
  }

  .sms-optin-page button:disabled {
    background: #64748b;
    opacity: 1;
    cursor: not-allowed;
  }

  .sms-optin-page .submission-message {
    display: none;
    margin: 20px 0;
    padding: 24px;
    background: var(--success-bg);
    border: 2px solid var(--success-border);
    border-radius: 12px;
    color: var(--success);
    text-align: center;
  }

  .sms-optin-page .submission-message h2 {
    margin: 0 0 8px 0;
    color: var(--success);
    font-size: 25px;
  }

  .sms-optin-page .submission-message p {
    margin: 6px 0;
    color: var(--success);
  }

  .sms-optin-page .privacy-note {
    margin-top: 16px;
    color: var(--muted);
    font-size: 13px;
    text-align: center;
  }

  .sms-optin-page .contact-card {
    margin-top: 26px;
    text-align: center;
    color: var(--muted);
    font-size: 14px;
  }

  .sms-optin-page .footer {
    border-top: 1px solid var(--border);
    margin-top: 28px;
    padding-top: 18px;
    color: var(--muted);
    font-size: 13px;
    text-align: center;
  }

  .sms-optin-page .hidden-frame {
    display: none;
    width: 0;
    height: 0;
    border: 0;
  }

  @media (max-width: 600px) {
    .sms-optin-page h1 {
      font-size: 28px;
    }

    .sms-optin-page .card {
      padding: 18px;
    }
  }