:root {
      --bg: #f6f7fb;
      --card: #ffffff;
      --text: #1d2330;
      --muted: #667085;
      --line: #e4e7ec;
      --accent: #2f5acf;
      --accent-soft: #eef3ff;
      --dark: #111827;
      --good: #0f766e;
      --bad: #b42318;
      --radius: 18px;
      --shadow: 0 14px 34px rgba(16, 24, 40, 0.08);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
    }

    a {
      color: var(--accent);
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }

    .page {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    .container {
      width: min(1120px, calc(100% - 32px));
      margin: 0 auto;
    }

    header {
      background: var(--card);
      border-bottom: 1px solid var(--line);
      position: sticky;
      top: 0;
      z-index: 10;
    }

    .topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      padding: 16px 0;
    }

    .logo {
      display: flex;
      flex-direction: column;
      gap: 2px;
      color: var(--dark);
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    .logo span {
      font-size: 13px;
      color: var(--muted);
      font-weight: 400;
      letter-spacing: 0;
    }

    nav {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: flex-end;
      font-size: 14px;
    }

    nav a {
      color: var(--text);
      padding: 8px 10px;
      border-radius: 999px;
    }

    nav a:hover,
    nav a.active {
      background: var(--accent-soft);
      color: var(--accent);
      text-decoration: none;
    }

    main {
      flex: 1;
    }

    .breadcrumbs {
      padding: 20px 0 0;
      color: var(--muted);
      font-size: 14px;
    }

    .breadcrumbs a {
      color: var(--muted);
    }

    .hero {
      padding: 28px 0 24px;
    }

    .hero-box {
      background: linear-gradient(135deg, #ffffff 0%, #eef3ff 100%);
      border: 1px solid var(--line);
      border-radius: 28px;
      padding: 38px;
      box-shadow: var(--shadow);
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      padding: 6px 12px;
      border-radius: 999px;
      background: #ffffff;
      border: 1px solid var(--line);
      color: var(--accent);
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    h1 {
      margin: 0 0 18px;
      font-size: clamp(30px, 5vw, 50px);
      line-height: 1.1;
      letter-spacing: -0.04em;
      color: var(--dark);
    }

    .lead {
      max-width: 780px;
      margin: 0;
      font-size: 18px;
      color: var(--muted);
    }

    section {
      padding: 26px 0;
    }

    .section-title {
      margin-bottom: 18px;
    }

    .section-title h2 {
      margin: 0 0 8px;
      font-size: 28px;
      line-height: 1.2;
      letter-spacing: -0.02em;
      color: var(--dark);
    }

    .section-title p {
      margin: 0;
      color: var(--muted);
      max-width: 780px;
    }

    .quick-answer {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow);
    }

    .quick-answer strong {
      color: var(--dark);
    }

    .examples {
      display: grid;
      gap: 14px;
    }

    .example {
      background: #ffffff;
      border: 1px solid var(--line);
      border-left: 4px solid var(--accent);
      border-radius: 14px;
      padding: 18px;
    }

    .example p {
      margin: 0;
    }

    .example strong {
      color: var(--dark);
    }

    .two-col {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .note-good,
    .note-bad {
      border-radius: var(--radius);
      padding: 22px;
      background: #ffffff;
      border: 1px solid var(--line);
    }

    .note-good h3,
    .note-bad h3 {
      margin: 0 0 10px;
      font-size: 20px;
      color: var(--dark);
    }

    .note-good {
      border-top: 4px solid var(--good);
    }

    .note-bad {
      border-top: 4px solid var(--bad);
    }

    .note-good ul,
    .note-bad ul {
      margin: 0;
      padding-left: 20px;
      color: var(--muted);
    }

    .note-good li,
    .note-bad li {
      margin: 6px 0;
    }

    .mini-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }

    .mini-card {
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 20px;
    }

    .mini-card h3 {
      margin: 0 0 8px;
      font-size: 18px;
      color: var(--dark);
    }

    .mini-card p {
      margin: 0;
      color: var(--muted);
    }

    .link-panel {
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 24px;
    }

    .link-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .link-grid a {
      display: block;
      padding: 14px 16px;
      border-radius: 14px;
      border: 1px solid var(--line);
      background: #ffffff;
      color: var(--text);
    }

    .link-grid a:hover {
      background: var(--accent-soft);
      border-color: #b8c7ff;
      color: var(--accent);
      text-decoration: none;
    }

    .link-grid strong {
      display: block;
      margin-bottom: 4px;
      color: inherit;
    }

    .link-grid span {
      display: block;
      color: var(--muted);
      font-size: 14px;
    }

    .faq {
      display: grid;
      gap: 12px;
    }

    details {
      background: #ffffff;
      border: 1px solid var(--line);
      border-radius: 14px;
      padding: 16px 18px;
    }

    summary {
      cursor: pointer;
      font-weight: 700;
      color: var(--dark);
    }

    details p {
      margin: 12px 0 0;
      color: var(--muted);
    }

    footer {
      margin-top: 36px;
      padding: 34px 0;
      background: var(--dark);
      color: #d1d5db;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr repeat(3, 1fr);
      gap: 24px;
    }

    .footer-grid h3,
    .footer-grid h4 {
      margin: 0 0 10px;
      color: #ffffff;
    }

    .footer-grid p {
      margin: 0;
      color: #9ca3af;
    }

    .footer-grid a {
      display: block;
      color: #d1d5db;
      margin: 7px 0;
    }



    /* Enhanced content tables */
    .df-table-wrap {
      overflow-x: auto;
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: 0 8px 22px rgba(16, 24, 40, 0.05);
    }

    .df-table {
      width: 100%;
      border-collapse: collapse;
      border-spacing: 0;
      background: var(--card);
      font-size: 16px;
      line-height: 1.5;
    }

    .df-table th,
    .df-table td {
      padding: 15px 18px;
      text-align: left;
      vertical-align: top;
    }

    .df-table th {
      background: var(--accent-soft);
      color: var(--dark);
      font-weight: 700;
      border-bottom: 1px solid var(--line);
    }

    .df-table td {
      border-bottom: 1px solid var(--line);
    }

    .df-table tbody tr:last-child td {
      border-bottom: 0;
    }

    .df-table tbody tr:hover {
      background: #fafbff;
    }

    .df-table td strong {
      color: var(--dark);
    }


    /* Four-step message structure */
    .df-structure {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 14px;
    }

    .df-step {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: 0 8px 22px rgba(16, 24, 40, 0.05);
    }

    .df-step > span {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 34px;
      height: 34px;
      border-radius: 50%;
      background: var(--accent-soft);
      color: var(--accent);
      font-weight: 700;
      line-height: 1;
    }

    .df-step h3 {
      margin: 14px 0 8px;
      color: var(--dark);
      font-size: 18px;
      line-height: 1.3;
    }

    .df-step p {
      margin: 0;
      color: var(--muted);
    }

    @media (max-width: 900px) {
      .topbar {
        align-items: flex-start;
        flex-direction: column;
      }

      nav {
        justify-content: flex-start;
      }

      .hero-box {
        padding: 30px;
      }

      .mini-grid,
      .link-grid,
      .two-col,
      .df-structure,
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 520px) {
      .container {
        width: min(100% - 24px, 1120px);
      }

      .hero-box {
        padding: 24px;
        border-radius: 22px;
      }
    }

@media (max-width: 700px) {
  .df-table {
    min-width: 720px;
  }

  .df-table th,
  .df-table td {
    padding: 13px 14px;
  }
}