css
/* 容器基座：多端自适应与浅色高对比度底色 */
.a {
    display: block;
    width: 96%;
    max-width: 780px;
    margin: 12px auto;
    padding: 16px;
    background: linear-gradient(135deg, #fcfcfd 0%, #f5f7fa 100%);
    border: 2px solid #7f8c8d;
    border-radius: 6px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: #2c3e50;
    position: relative;
    box-sizing: border-box;
}

/* 战术终端四角金属切角装饰效果 */
.a::before, .a::after {
    content: "";
    position: absolute;
    width: 12px;
    height: 12px;
    border-color: #2c3e50;
    border-style: solid;
    pointer-events: none;
}
.a::before {
    top: 5px;
    left: 5px;
    border-width: 2px 0 0 2px;
}
.a::after {
    bottom: 5px;
    right: 5px;
    border-width: 0 2px 2px 0;
}

/* 头部状态栏：密排网格 */
.a .h {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 6px;
    border-bottom: 2px dashed #bdc3c7;
    padding-bottom: 10px;
    margin-bottom: 14px;
    font-size: 13px;
    color: #4f5f6f;
    font-weight: 500;
}

.a .h p {
    display: block;
    background: #eef2f5;
    padding: 4px 8px;
    border-radius: 4px;
    border-left: 3px solid #7f8c8d;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0;
}

/* 正文区域：大字号，高清晰度可读性 */
.a .b {
    display: block;
    font-size: 16.5px;
    line-height: 1.75;
    color: #1a252f;
    margin-bottom: 18px;
    text-align: justify;
}

.a .b p {
    margin: 0 0 12px 0;
    text-indent: 2em;
}

/* 折叠面板 (Details) 美化 */
.a details {
    background: #ffffff;
    border: 1px solid #dcdde1;
    border-radius: 5px;
    margin-bottom: 8px;
    overflow: hidden;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.a details[open] {
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    border-color: #7f8c8d;
}

/* 折叠面板头部 */
.a summary {
    padding: 10px 14px;
    font-size: 14.5px;
    font-weight: 600;
    color: #34495e;
    background: #f1f2f6;
    cursor: pointer;
    outline: none;
    list-style: none;
    border-bottom: 1px solid transparent;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.a details[open] summary {
    background: #e8ecef;
    border-bottom-color: #dcdde1;
}

/* 去除默认三角，添加自定义展开指示 */
.a summary::-webkit-details-marker {
    display: none;
}
.a summary::after {
    content: "＋";
    font-size: 12px;
    color: #7f8c8d;
    transition: transform 0.2s ease;
}
.a details[open] summary::after {
    content: "－";
}

/* 折叠面板内部包装盒 */
.a details div {
    display: block;
    padding: 12px 14px;
    background: #ffffff;
    font-size: 13.5px;
}

/* 数据行与子项目样式 */
.a p {
    display: block;
    line-height: 1.6;
    margin-bottom: 6px;
    color: #333333;
}

.a p.s {
    padding-left: 12px;
    font-size: 13px;
    color: #666666;
    border-left: 2px solid #e1b12c;
    background: #fffdf5;
    margin-top: 4px;
    padding-top: 2px;
    padding-bottom: 2px;
}

/* 强调高亮标记 */
.a b {
    font-weight: bold;
    color: #2c3e50;
    background: #eef2f7;
    padding: 1px 4px;
    border-radius: 3px;
    border: 1px solid #dcdde1;
}

/* 特殊高亮（如侵蚀率、危险警报） */
.a b:contains("%"), .a p.s b {
    color: #c0392b;
    background: #fadbd8;
    border-color: #f1948a;
}

/* 移动端适配 */
@media (max-width: 480px) {
    .a {
        width: 100%;
        margin: 0;
        border-width: 1px;
        border-radius: 0;
        padding: 10px;
    }
    .a .b {
        font-size: 15.5px;
        line-height: 1.65;
    }
    .a .h {
        grid-template-columns: repeat(2, 1fr);
        font-size: 12px;
    }
    .a summary {
        padding: 8px 10px;
        font-size: 13.5px;
    }
    .a details div {
        padding: 8px 10px;
        font-size: 12.5px;
    }
}