body {
            background-color: #f9f9f9;
            color: #333;
            line-height: 1.8;
        }
        
        .container {
            max-width: 900px;
            margin: 0 auto;
            background-color: white;
	    padding: 15px 40px 40px;
            border-radius: 12px;
            box-shadow: 0 0 25px rgba(0,0,0,0.06);
        }
        h1 {
            text-align: center;
            color: #2d3748;
            margin-bottom: 10px;
            font-weight: 700;
            border-bottom: 1px solid #4a5568;
            padding-bottom: 10px;
        }
        h2 {
            color: #4a5568;
            font-weight: 600;
            font-size: 1.5rem;
            position: relative;
	    margin: 10px 0 10px;
            
        }

        h3 {
            color: #2d3748;
            margin: 30px 0 18px;
            font-weight: 600;
            font-size: 1.25rem;
        }
	a {text-decoration: none;color:#4a5568}
        p {
            margin-bottom: 20px;
            
            font-size: 1.05rem;
            color: #4a5568;
        }
        .gua-structure {
            text-align: center;
            margin: 20px 0;
            padding: 15px;
            background: #f8f9fa;
            border-radius: 8px;
        }
        .gua-symbol {
            font-size: 1.8rem;
            margin: 10px 0;
        }
        .gua-structure p {
            text-align:left;
            margin-bottom: 12px;
            font-weight: 500;
        }
        .example {
            background-color: #fff;
            padding: 25px;
            border-radius: 10px;
            margin: 25px 0;
            border: 1px solid #e2e8f0;
            box-shadow: 0 3px 10px rgba(0,0,0,0.04);
        }
        .example p {
            text-indent: 0;
            margin-bottom: 15px;
        }
        .key-word {
            color: black;
            font-weight: 600;
        }
        .conclusion {
            box-shadow: 0 3px 10px rgba(0,0,0,0.04);
            padding: 30px;
            border-radius: 10px;
        }
	.center {text-align:center}
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 25px 0;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        th, td {
            border: 1px solid #e2e8f0;
            padding: 3px;
            text-align: left;
        }
        th {
            background-color: #f7fafc;
            font-weight: 600;
            color: #4a5568;
        }
        tr:nth-child(even) {
            background-color: #fafafa;
        }
        .tool-section {
            background: #f8f9fa;
            padding: 25px;
            border-radius: 10px;
            margin: 30px 0;
        }
        footer {
            text-align: center;
            margin-top: 20px;
            color: #718096;
            font-size: 0.95rem;
            padding-top: 20px;
            
        }
        @media (max-width: 768px) {
            .container {
                padding: 10px;
            }
            h1 {
                font-size: 1.6rem;
                margin-bottom: 5px;
            }
            h2 {
                font-size: 1.3rem;
                margin: 10px 0 6px;
            }
            h3 {
                font-size: 1.15rem;
                margin: 8px 0 5px;
            }
            p {
                font-size: 1rem;
                margin-bottom: 18px;
            }
            .gua-basic {
                padding: 20px;
                margin: 30px 0;
            }
            .example {
                padding: 20px;
                margin: 20px 0;
            }
	    .conclusion {
            box-shadow: 0 3px 10px rgba(0,0,0,0.04);
            padding: 5px;
            border-radius: 2px;
            }
	    .tool-section {
            background: #f8f9fa;
            padding: 5px;
            border-radius: 2px;
            }
        }