body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
            font-family: 'Poppins', sans-serif;
            color: #333;
        }
        .rules-container {
            background-color: #fff;
            padding: 2.5rem;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            width: 100%;
            max-width: 700px;
            text-align: left;
            position: relative;
            max-height: 90vh;
            overflow-y: auto;
        }
        h2 {
            text-align: center;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
        }
        h3 {
            margin-top: 1.5rem;
            margin-bottom: 0.5rem;
            color: #555;
        }
        p {
            margin-bottom: 1rem;
            line-height: 1.6;
        }
        ul {
            margin-bottom: 1rem;
            padding-left: 20px;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .close-button {
            display: block;
            width: 100%;
            padding: 1rem;
            margin-top: 2rem;
            background: var(--primary-color);
            color: #fff;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .close-button:hover {
            background: #103a1a;
            color: #fff;
        }