:root {
      --border: #d9d9d9;
      --text: #111;
      --muted: #555;
      --link: #1a36d8;
      --bg: #ffffff;
      --panel-bg: #ffffff;
      --soft: #f7f7f7;
      --shadow: 0 0 0 0 rgba(0,0,0,0);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      padding: 24px;
      background: var(--bg);
      color: var(--text);
      font-family: Arial, Helvetica, sans-serif;
      line-height: 1.45;
    }

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

    a:hover {
      text-decoration: underline;
    }

    /* Outer page frame */
    .frame {
      max-width: 1440px;
      margin: 0 auto;
      border: 1px solid var(--border);
      padding: 16px;
      background: #fff;
    }

    /* Optional page header */
    .page-header {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      gap: 16px;
      margin: 0 0 18px 0;
      padding: 0 4px 6px 4px;
      border-bottom: 1px solid var(--border);
    }

    .page-header h1 {
      font-size: 24px;
      margin: 0;
      font-weight: 700;
      letter-spacing: 0.01em;
    }

    .page-header .subtitle {
      color: var(--muted);
      font-size: 14px;
    }

    /* Two-column pair layout */
    .pair-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      align-items: start;
    }

    /* Individual nested box */
    .panel {
      border: 1px solid var(--border);
      background: var(--panel-bg);
      padding: 16px;
      min-height: 760px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .panel-inner {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    /* Image block */
    .image-wrap {
      width: 100%;
      aspect-ratio: 1 / 1;
      background: var(--soft);
      border: 1px solid #ececec;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .image-wrap img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
    }

    /* Notes block under image */
    .notes {
      font-size: 18px;
      line-height: 1.5;
    }

    .notes p {
      margin: 0 0 10px 0;
    }

    .notes .bullet {
      margin-right: 0.25em;
    }

    /* Buttonlink style, kept as a reusable class */
    .buttonlink {
      display: inline-block;
      padding: 0.35em 0.7em;
      border: 1px solid var(--border);
      border-radius: 999px;
      background: #fff;
      color: var(--link);
      text-decoration: none;
      font-size: 15px;
      line-height: 1;
      vertical-align: middle;
      transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
    }

    .buttonlink:hover {
      background: #f4f6ff;
      border-color: #bfc9ff;
      text-decoration: none;
    }

    .buttonlink:active {
      transform: translateY(1px);
    }

    .button-row {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 4px;
    }

    /* Bottom callout */
    .callout {
      border: 1px solid var(--border);
      background: #fff;
      padding: 14px 16px;
      font-size: 15px;
      line-height: 1.45;
    }

    .small {
      font-size: 14px;
      color: #222;
    }

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

    /* Optional section separators if you later stack multiple pairs */
    .pair-block + .pair-block {
      margin-top: 18px;
    }

    /* Responsive */
    @media (max-width: 900px) {
      body {
        padding: 12px;
      }

      .frame {
        padding: 12px;
      }

      .pair-grid {
        grid-template-columns: 1fr;
      }

      .panel {
        min-height: auto;
      }

      .notes {
        font-size: 17px;
      }
    }