:root {
      color-scheme: dark;
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background: #050505;
      color: #f7f7f2;
      font-size: 18px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      background: #050505;
      color: #f7f7f2;
    }

    main {
      width: min(1500px, calc(100% - 32px));
      margin: 0 auto;
      padding: 28px 0 48px;
    }

    .narrow {
      width: min(760px, calc(100% - 32px));
    }

    .intro {
      border-bottom: 2px solid #f7f7f2;
      margin-bottom: 28px;
      padding-bottom: 20px;
    }

    .top-nav {
      align-items: center;
      display: flex;
      gap: 12px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }

    .top-nav a,
    .top-nav button {
      border: 2px solid #f7f7f2;
      border-radius: 6px;
      color: #f7f7f2;
      font-weight: 800;
      padding: 10px 12px;
      text-decoration: none;
    }

    .top-nav button {
      background: transparent;
      cursor: pointer;
    }

    .top-nav a.active {
      background: #f7f7f2;
      color: #050505;
    }

    .top-nav span {
      color: #d6d3d1;
      font-size: 0.9rem;
    }

    .error {
      border: 2px solid #fca5a5;
      border-radius: 6px;
      color: #fecaca;
      padding: 12px;
    }

    .eyebrow {
      color: #67e8a5;
      font-size: 0.85rem;
      font-weight: 800;
      margin: 0 0 8px;
      text-transform: uppercase;
    }

    h1,
    h2,
    p {
      margin-top: 0;
    }

    h1 {
      font-size: 2.4rem;
      line-height: 1.05;
      margin-bottom: 12px;
    }

    h2 {
      font-size: 1.25rem;
      margin-bottom: 16px;
    }

    .layout {
      display: grid;
      gap: 32px;
      grid-template-columns: minmax(320px, 480px) minmax(0, 1fr);
      align-items: start;
    }

    .exercise-form {
      display: grid;
      gap: 16px;
    }

    .catalog-grid {
      display: grid;
      gap: 32px;
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .catalog-section {
      min-width: 0;
    }

    .catalog-form,
    .inline-form {
      display: grid;
      gap: 10px;
    }

    .field,
    fieldset {
      display: grid;
      gap: 8px;
    }

    .field-grid {
      display: grid;
      gap: 14px;
      grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    label,
    legend,
    th {
      color: #67e8a5;
      font-size: 0.82rem;
      font-weight: 800;
      text-align: left;
      text-transform: uppercase;
    }

    input,
    select,
    textarea {
      width: 100%;
      border: 2px solid #f7f7f2;
      border-radius: 6px;
      background: #111111;
      color: #ffffff;
      font: inherit;
      padding: 12px;
    }

    textarea {
      resize: vertical;
    }

    fieldset {
      border: 2px solid #5eead4;
      border-radius: 6px;
      margin: 0;
      padding: 14px;
    }

    .topic-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .check {
      align-items: center;
      border: 1px solid #f7f7f2;
      border-radius: 6px;
      color: #f7f7f2;
      display: inline-flex;
      gap: 8px;
      padding: 8px 10px;
      text-transform: none;
    }

    .check input {
      width: auto;
    }

    button,
    .button-link {
      border: 2px solid #f7f7f2;
      border-radius: 6px;
      background: #f7f7f2;
      color: #050505;
      cursor: pointer;
      display: inline-block;
      font: inherit;
      font-weight: 800;
      padding: 12px 16px;
      text-decoration: none;
    }

    .table-wrap {
      overflow-x: auto;
      border-top: 2px solid #f7f7f2;
    }

    .catalog-table {
      min-width: 680px;
    }

    .actions {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 840px;
    }

    th,
    td {
      border-bottom: 1px solid #777777;
      padding: 12px;
      vertical-align: top;
    }

    td span {
      color: #d6d3d1;
      display: block;
      font-size: 0.9rem;
      margin-top: 6px;
      max-width: 40ch;
      overflow-wrap: anywhere;
    }

    @media (max-width: 980px) {
      .layout,
      .field-grid,
      .catalog-grid {
        grid-template-columns: 1fr;
      }
    }