* {
        font-family: Arial, sans-serif;
    }

    .presentation-container {
        text-align: center;
        margin-bottom: 20px;
        padding: 20px;
        background: #f8f9fa;
        border-radius: 10px;
        box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
        margin: auto;
    }

    .presentation-container h3 {
        margin: 5px 0;
        color: #333;
        font-size: 22px;
    }

    .presentation-container h3 b {
        color: #007bff;
    }

    .nav-buttons {
        display: flex;
        justify-content: center;
        gap: 30px;
        margin-top: 10px;
    }

    .nav-buttons a {
        display: inline-block;
        padding: 10px 15px;
        text-decoration: none;
        color: white;
        background: #007bff;
        border-radius: 5px;
        font-weight: bold;
        transition: background 0.3s;
        min-width: 100px;
    }

    .nav-buttons a:hover {
        background: #0056b3;
    }

    /* Mobil uyumluluk */
    @media (max-width: 600px) {
        .presentation-container {
            width: 90%;
            padding: 15px;
        }

        .nav-buttons {
            flex-direction: column;
        }

        .nav-buttons a {
            width: 100%;
            text-align: center;
        }
    }

    .sessions-container {
        background: #f8f9fa;
        border-radius: 10px;
        padding: 20px;
        box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
        margin: auto;
    }

    .sessions-container h2 {
        text-align: center;
        color: #333;
        margin-bottom: 20px;
    }

    table {
        width: 100%;
        border-collapse: collapse;
        background: white;
        border-radius: 8px;
        overflow: hidden;
        box-shadow: 0px 2px 4px rgba(0, 0, 0, 0.1);
    }

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

    th {
        background: #007bff;
        color: white;
        font-weight: bold;
    }

    tr:nth-child(even) {
        background: #f9f9f9;
    }

    .session-header {
        padding: 15px;
        background: #f9f9f9;
        border-radius: 8px;
        margin-bottom: 15px;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .session-title {
        margin: 0;
        font-size: 24px;
        font-weight: bold;
        color: #333;
        text-decoration: none;
    }

    .edit-button {
        background: #007BFF;
        color: #fff;
        padding: 10px 15px;
        border-radius: 8px;
        text-decoration: none;
        font-weight: bold;
        transition: 0.3s;
        display: inline-block;
    }

    .edit-button:hover {
        background: #0056b3;
    }

    .session-container {
        display: flex;
        gap: 10px;
        padding: 10px;
        background: #f9f9f9;
        border-radius: 8px;
        justify-content: center;
    }

    .session-box {
        width: 300px;
        height: 40px;
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        padding: 15px;
        border: 2px solid #ddd;
        border-radius: 8px;
        font-size: 20px;
        color: #333;
    }

    .room-box {
        background: #e2efda;
    }

    .time-box {
        width: 100px;
        background: yellow;
    }

    .chairs-box {
        flex: 1;
        background: #fff;
        border-radius: 16px;
    }

    /* Responsive table wrapper */
    .table-responsive {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    @media (max-width: 768px) {
        /* Session container stacks vertically */
        .session-container {
            flex-direction: column;
            align-items: stretch;
        }

        .session-box {
            width: 100%;
            height: auto;
            font-size: 16px;
        }

        .time-box {
            width: 100%;
        }

        /* Sessions overview table (Room / Session / Time) */
        .sessions-container table thead {
            display: none;
        }

        .sessions-container table tr {
            display: block;
            margin-bottom: 8px;
            border: 1px solid #ddd;
            border-radius: 4px;
            background: #fff;
        }

        .sessions-container table td {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 8px 12px;
            border-bottom: 1px solid #eee;
            text-align: right;
        }

        .sessions-container table td::before {
            content: attr(data-label);
            font-weight: bold;
            text-align: left;
            margin-right: 10px;
            white-space: nowrap;
            color: #555;
        }

        /* Presentations table */
        .presentations-table thead {
            display: none;
        }

        .presentations-table tr {
            display: block;
            margin-bottom: 12px;
            border: 1px solid #ccc;
            border-radius: 6px;
            overflow: hidden;
        }

        .presentations-table td {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            padding: 8px 12px;
            border-bottom: 1px solid #eee;
            text-align: right;
            word-break: break-word;
        }

        .presentations-table td::before {
            content: attr(data-label);
            font-weight: bold;
            text-align: left;
            margin-right: 10px;
            white-space: nowrap;
            color: #555;
            flex-shrink: 0;
        }

        .presentations-table td[colspan] {
            justify-content: flex-start;
            text-align: left;
        }

        .presentations-table td[colspan]::before {
            display: none;
        }
    }