* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: Arial, sans-serif;
    }

    body {
      background: #f4f6fb;
    }

    .container {
      max-width: 750px;
      margin: 0 auto 30px;
      background: #fff;
      border-radius: 18px;
      box-shadow: 0 8px 24px rgba(0,0,0,.08);
      overflow: hidden;
      padding-bottom: 20px;
    }

    .top-banner {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
    }

    .navbar {
      background: #1e3a8a;
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      padding: 10px;
    }

    .navbar button {
      background: transparent;
      border: none;
      color: #fff;
      padding: 8px 12px;
      margin: 3px;
      cursor: pointer;
      border-radius: 8px;
      transition: .2s;
      font-size: 14px;
      font-weight: bold;
    }

    .navbar button:hover,
    .navbar button.active-nav {
      background: rgba(255, 255, 255, .25);
    }

    .content {
      padding: 20px 22px;
    }

    .sub-navbar {
      display: flex;
      justify-content: center;
      gap: 10px;
      margin-bottom: 20px;
      border-bottom: 2px solid #eee;
      padding-bottom: 12px;
    }

    .sub-navbar button {
      background: #e2e8f0;
      border: none;
      color: #475569;
      padding: 6px 14px;
      cursor: pointer;
      border-radius: 20px;
      font-weight: bold;
      font-size: 13px;
      transition: all 0.2s ease;
    }

    .sub-navbar button:hover {
      background: #cbd5e1;
    }

    .sub-navbar button.active-sub {
      background: #d40000;
      color: #ffffff;
    }

    .page {
      display: none;
      animation: fade .3s;
    }

    .page.active {
      display: block;
    }

    .year-content {
      display: none;
      margin-top: 15px;
      line-height: 1.8;
      text-align: justify;
      font-size: 17px;
      color: #333;
    }

    .year-content.active-year {
      display: block;
      animation: fade .3s;
    }

    @keyframes fade {
      from {
        opacity: 0;
        transform: translateY(10px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .card h2 {
      color: #d40000;
      text-align: center;
      margin-bottom: 18px;
      font-size: 28px;
    }

    .card p {
      font-size: 17px;
      line-height: 1.8;
      text-align: justify;
      color: #333;
    }

    .btn-wrap {
      text-align: center;
      margin-top: 25px;
      border-top: 1px dashed #eee;
      padding-top: 15px;
    }

    .back {
      display: inline-block;
      background: navy;
      color: #fff;
      text-decoration: none;
      padding: 12px 22px;
      border-radius: 10px;
      font-weight: bold;
      transition: opacity 0.2s;
    }

    .back:hover {
      opacity: .85;
    }

    @media(max-width:600px) {
      .container {
        margin: 10px;
        border-radius: 12px;
      }
      .top-banner {
        height: 180px;
      }
      .navbar button {
        font-size: 13px;
        padding: 6px 10px;
      }
      .card h2 {
        font-size: 22px;
      }
      .card p, .year-content {
        font-size: 15px;
      }
    }