body {
      background: linear-gradient(#87ceeb, #f0f8ff); /* sky blue to light ocean */
      font-family: "Tahoma", "Verdana", sans-serif;
      margin: 0;
      padding: 0;
      color: #000;
    }

    #container {
      display: flex;
      flex-direction: column;
      min-height: 100vh;
      max-width: 1200px;
      margin: auto;
      background: #fdfdfd url("<!-- BEACH_BG -->") no-repeat center/cover;
      border: 3px solid #0057b7;
      box-shadow: 0 0 15px #1e90ff;
    }

    header {
      background: linear-gradient(#3a95ff, #1e5fcd);
      color: #fff;
      padding: 12px;
      font-size: 26px;
      font-weight: bold;
      text-shadow: 1px 1px #000;
      border-bottom: 2px solid #004080;
      display: flex;
      align-items: center;
    }

    header img {
      height: 32px;
      margin-right: 10px;
    }

    .content {
      flex: 1;
      display: flex;
      background: rgba(255, 255, 255, 0.7);
    }

    .sidebar, .rightbar {
      flex: 0 0 220px;
      padding: 10px;
      background: #f0f8ff;
      border-right: 2px solid #99cfff;
    }

    .rightbar {
      border-left: 2px solid #99cfff;
      border-right: none;
    }

    .main {
      flex: 1;
      padding: 15px;
      background: #fffbea; /* sandy look */
    }

    .box {
      background: #ffffff;
      border: 2px solid #99cfff;
      margin-bottom: 15px;
      padding: 10px;
      box-shadow: inset 0 0 4px #cce6ff;
    }

    .box h3 {
      margin: 0 0 6px;
      padding: 4px 6px;
      background: linear-gradient(#ffecb3, #ffd966); /* sunny yellow */
      border: 1px solid #e6b800;
      font-size: 13px;
      font-weight: bold;
      color: #333;
    }

    .button {
      display: inline-block;
      padding: 5px 12px;
      background: linear-gradient(#f0f8ff, #b0d6ff);
      color: #000;
      border: 2px solid #004080;
      border-radius: 6px;
      font-weight: bold;
      font-size: 13px;
      text-decoration: none;
      box-shadow: 2px 2px #808080;
    }

    footer {
      text-align: center;
      padding: 8px;
      font-size: 12px;
      background: linear-gradient(#3a95ff, #1e5fcd);
      color: #fff;
      border-top: 2px solid #004080;
    }