body {
            background-color: #ffffff;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: #333;
            line-height: 1.5;
            margin: 0;
            padding-top: 80px;
        }

        .top-menu {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: #2c3e50;
            color: #ecf0f1;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 5px 10px;
            box-sizing: border-box;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
            z-index: 1000;
        }

        .menu-left {
            display: flex;
            flex-direction: column;
            text-align: left;
        }

        .general-title {
            font-size: 1.3em;
            font-weight: bold;
            color: #fff;
        }

        .lecture-title {
            font-size: 0.95em;
            color: #bdc3c7;
            margin-top: 2px;
        }

        .menu-right {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            justify-content: flex-end;
        }

        .menu-right a {
            color: #ecf0f1;
            text-decoration: none;
            font-size: 0.95em;
            padding: 4px 8px;
            border-radius: 0;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .menu-right a:hover {
            background-color: #34495e;
            color: #fff;
        }

        .menu-right a.active {
            background-color: #16a085;
            color: #fff;
            font-weight: bold;
        }

        .slide {
            width: 95%;
            max-width: 1400px;
            margin: 40px auto;
            background-color: #f9f9f9;
            border: 1px solid #d1d1d1;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
            display: flex;
            flex-direction: column;
            min-height: 500px;
            page-break-after: always;
        }

        .header {
            background-color: #4682B4;
            color: white;
            padding: 10px 5px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .slide-number {
            font-size: 1.2em;
            font-weight: bold;
        }

        .slide-title {
            font-size: 1.6em;
            text-align: right;
        }

        .content-wrapper {
            display: flex;
            flex-grow: 1;
            padding: 40px;
            align-items: flex-start;
        }

        .content-text {
            flex: 1.6;
            padding-right: 40px;
            font-size: 1.2em;
            text-align: justify;
        }

        .content-image {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 350px;
        }

        .content-image a {
            color: #2980b9;
            text-decoration: none;
            font-weight: bold;
        }

        img {
            width: 550px;
            height: auto;
        }