* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            min-height: 100vh;
            padding: 50px 20px;
            font-family: Arial, sans-serif;
            background: linear-gradient(135deg, #1f1f1f, #363636);
            color: white;
        }

        h1 {
            margin-bottom: 25px;
            color: #f7df1e;
            font-size: 42px;
            text-align: center;
        }

        /* Nút về trang chủ */
        body > a {
            display: block;
            width: fit-content;
            margin: 0 auto 30px;
            padding: 10px 20px;
            border: 2px solid #f7df1e;
            border-radius: 8px;
            color: #f7df1e;
            font-weight: bold;
            text-decoration: none;
            transition: 0.3s;
        }

        body > a:hover {
            background-color: #f7df1e;
            color: #222;
        }

        ol {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 18px;
            max-width: 900px;
            margin: auto;
            list-style-position: inside;
        }

        li {
            padding: 20px;
            border-left: 5px solid #f7df1e;
            border-radius: 10px;
            background-color: white;
            color: #333;
            font-weight: bold;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.25);
            transition: 0.3s;
        }

        li:hover {
            transform: translateY(-5px);
            background-color: #f7df1e;
            box-shadow: 0 10px 22px rgba(0, 0, 0, 0.35);
        }

        li a {
            color: #333;
            text-decoration: none;
        }

        li a:hover {
            color: #000;
        }