body {
            font-family: Arial, sans-serif;
            line-height: 1.8;
            color: #333;
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
            background: #f8f9fa;
        }
        /* 标题颜色调整 */
        h1 {
            color: #c23616; /* 深红色 */
            text-align: center;
            font-size: 2.2rem;
            margin: 30px 0 40px;
            border-bottom: 3px solid #c23616;
            padding-bottom: 10px;
        }
        h2 {
            color: #e74c3c; /* 红色 */
            font-size: 1.8rem;
            margin: 40px 0 20px;
            padding-left: 10px;
            border-left: 4px solid #c23616;
        }
        h3 {
            color: #e17055; /* 浅红色 */
            font-size: 1.4rem;
            margin: 30px 0 15px;
        }
        /* 仅对指定段落首字母进行特写（通过类名控制） */
        .first-letter-special:first-letter {
            font-size: 1.8em;
            font-weight: bold;
            color: #c23616;
            margin-right: 2px;
        }
        .img-container {
            margin: 30px 0;
            overflow: hidden;
        }
        .img-left {
            float: left;
            width: 45%;
            margin-right: 30px;
        }
        .img-right {
            float: right;
            width: 45%;
            margin-left: 30px;
        }
        .img-full {
            width: 100%;
            max-width: 900px;
            margin: 0 auto;
            display: block;
        }
        img {
            width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
        }
        img:hover {
            transform: scale(1.03);
        }
        .img-caption {
            text-align: center;
            color: #666;
            font-size: 0.9rem;
            margin: 10px 0 20px;
            font-style: italic;
        }
        .callout {
            background: #ffeaa7;
            border-left: 4px solid #fdcb6e;
            padding: 15px 20px;
            margin: 25px 0;
            border-radius: 4px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 25px 0;
        }
        th, td {
            border: 1px solid #ddd;
            padding: 12px;
            text-align: left;
        }
        th {
            background: #c23616;
            color: white;
        }
        tr:nth-child(even) {
            background: #fef5f5;
        }
        /* 重点内容强调样式 */
        strong {
            color: #c23616;
            font-weight: bold;
        }
        em {
            color: #8e44ad;
            font-style: italic;
        }
        u {
            text-decoration: underline;
            text-underline-offset: 3px;
            color: #2980b9;
        }
        @media (max-width: 768px) {
            .img-left, .img-right {
                float: none;
                width: 100%;
                margin: 0 0 20px 0;
            }
            h1 { font-size: 1.8rem; }
            h2 { font-size: 1.5rem; }
            h3 { font-size: 1.2rem; }
        }