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

        /* เมนูด้านข้าง */
        .side-menu {
            float: left;
            height: 100vh;
            width: 250px;
            background-color: #800;
            color: white;
            padding: 20px;
        }

        .side-menu img {
            border-radius: 10px;
            display: block;
            margin: 0 auto;
        }

        .side-menu ul {
            list-style: none;
            padding: 0;
        }

        .side-menu li {
            margin: 10px 0;
        }

        /* ส่วนเนื้อหาหลัก */
        .main{
            margin-left: 250px;
        }

        .content {
            display: none; /* ซ่อนเนื้อหาหลัก จนกว่าจะล็อกอิน */
        }

        .content-a {
            padding: 20px;
        }

        main {
              width: 100%;
            margin: auto;
            padding: 20px;
            background: white;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
        }

        h2 {
            text-align: center;
            color: #333;
        }

        label {
            display: block;
            margin: 10px 0 5px;
            font-weight: bold;
        }

        input {
            width: 100%;
            padding: 8px;
            margin-bottom: 15px;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 16px;
        }

        .btn-group {
            display: flex;
            justify-content: space-between;
        }

        button {
            width: 100%;
            padding: 10px;
            background-color: #800;
            color: white;
            border: none;
            border-radius: 5px;
            font-size: 16px;
            cursor: pointer;
        }

        button:hover {
            opacity: 0.8;
        }

        .error-message {
            color: red;
            margin-top: 10px;
            display: none;
        }

        .save-btn {
            background-color: #28a745;
            color: white;
        }

        .cancel-btn {
            background-color: #dc3545;
            color: white;
        }

        button:hover {
            opacity: 0.8;
        }

        body {
            background-color: #f4f4f4;
        }
        .mt-10{margin-top: 3em;}
        
        li li {
            padding-left: 5px;
            cursor: pointer;
        }

        li li a {
            font-weight: 300;
            color: #fff;
            text-decoration: none;
            transition: .2s;
        }
        
        li li a:hover {
            font-weight: 500;
        }
        
        li li::before {
            content: '▶';
            padding: 0 5px;
        }
        h3{
            color: #800;
            font-weight: bold;
            font-size: 32px;
        }
        h4{
            color: #3f3f42;
            font-size: 24px;
            font-weight: 500;
        }
        .gap{
            height: 15px;
        }

        #mainContent { display: none; }

li b a:hover {
    font-weight: bold;
}
li b a {
    color: #fff;
    text-decoration: none;
    font-weight: 300;
    transition: .2s;
}