h1 {
      text-align: center;
      color: var(--dark-blue);
      margin-bottom: 30px;
    }

    .year-section {
      background-color: #f9f9f9;
      max-width: 1200px;
      border-radius: 12px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.1);
       margin:3px auto;
      overflow: hidden;
      border-left: 6px solid var(--primary-green);
    }

    .year-header {
      background-color: var(--primary-green);
      color: var(--bg-white);
      padding: 15px 20px;
      cursor: pointer;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background-color 0.3s ease;
    }

    .year-header:hover {
      background-color: var(--dark-blue);
    }

    .year-count {
      background-color: var(--highlight-orange);
      color: var(--bg-white);
      border-radius: 20px;
      padding: 3px 12px;
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 1px 4px rgba(0,0,0,0.2);
    }

    .year-content {
      display: none;
      padding: 20px;
      background-color: var(--bg-white);
      border-top: 1px solid #ddd;
      animation: fadeIn 0.4s ease-in-out;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 10px;
      font-size: 15px;
    }

    th, td {
      border: 1px solid #ddd;
      padding: 10px;
      text-align: left;
      vertical-align: top;
    }

    th {
      background-color: var(--secondary-green);
      color: darkgreen;
    }

    tr:nth-child(even) {
      background-color: #f2f2f2;
    }

    tr:hover {
      background-color: #e8f5e9;
    }

    .pub-title {
      color: var(--dark-blue);
      font-weight: 600;
    }

    .pub-authors {
      font-style: italic;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(-5px); }
      to { opacity: 1; transform: translateY(0); }
    }