* {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: system-ui, sans-serif;
      background: #f4f4f4;
      color: #222;
    }

    #app {
      width: 100vw;
      height: 100vh;
      display: grid;
      grid-template-columns: 220px 1fr 220px;
      grid-template-rows: 1fr 160px 60px;
      gap: 8px;
      padding: 8px;
    }

    .panel {
      background: white;
      border: 1px solid #ccc;
      border-radius: 8px;
      padding: 8px;
      overflow: auto;
    }

    .panel h2 {
      margin: 0 0 8px;
      font-size: 16px;
    }

    #creators-panel {
      grid-column: 1;
      grid-row: 1;
    }

    #feeds-panel {
      grid-column: 2;
      grid-row: 1 / 3;
    }

    #system-panel {
      grid-column: 3;
      grid-row: 1 / 3;
      display: grid;
      grid-template-rows: 1fr 1fr 1fr;
      gap: 8px;
      padding: 0;
      border: none;
      background: transparent;
    }

    #users-panel {
      grid-column: 1;
      grid-row: 2;
    }

    #controls-panel {
      grid-column: 1 / 4;
      grid-row: 3;
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 8px;
    }

    .feed-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      gap: 8px;
    }

    .feed-column,
    .actor-card,
    .feed-item {
      border: 1px solid #ddd;
      border-radius: 6px;
      padding: 6px;
      background: #fafafa;
    }

    .feed-column h3,
    .actor-card h3 {
      margin: 0 0 6px;
      font-size: 14px;
    }

    .feed-item {
      margin-bottom: 6px;
      min-height: 32px;
    }

    button,
    select {
      font: inherit;
      padding: 6px 10px;
    }