/* --- 1. 全局与基础样式 --- */
:root {
    /* 文化传播专属配色体系 */
    --primary-color: #C41E3A; /* 朱砂红（主色）- 文化感+视觉焦点 */
    --secondary-color: #E64340; /* 珊瑚红（辅助色）- hover/强调 */
    --dark-color: #2D2D2D; /* 墨色（深色文本） */
    --light-color: #F5F0E6; /* 宣纸米白（浅背景） */
    --text-color: #4A4A4A; /* 深灰（常规文本） */
    --border-color: #E0D8C8; /* 浅棕（边框） */
    --white-color: #FFFFFF; /* 纯白 */
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08); /* 柔和阴影 */
    --texture-bg: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%23e0d8c8' fill-opacity='0.2' fill-rule='evenodd'/%3E%3C/svg%3E");
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    /* 修正：增加系统默认衬线字体回退，确保在未安装思源字体的电脑上也能显示宋体风格 */
    font-family: "思源宋体", "Source Han Serif CN", "Songti SC", "SimSun", "STSong", "AR PL New Sung", serif; 
    line-height: 1.8; 
    color: var(--text-color);
    background-color: var(--white-color);
    background-image: var(--texture-bg);
    display: flex; flex-direction: column; min-height: 100vh;
}
main { flex: 1; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 标题样式 - 中式书法感 */
h1, h2, h3, h4 { 
    color: var(--dark-color); 
    margin-bottom: 1rem; 
    /* 修正：增加标题的系统楷体回退 */
    font-family: "华文楷体", "STKaiti", "KaiTi", "SimKai", serif;
    font-weight: 600;
}
h2 { 
    font-size: 2.5rem; 
    text-align: center; 
    margin-bottom: 3rem; 
    position: relative; 
    letter-spacing: 2px;
}
h2::after { 
    content: ''; 
    position: absolute; 
    bottom: -10px; 
    left: 50%; 
    transform: translateX(-50%); 
    width: 80px; 
    height: 3px; 
    background-color: var(--primary-color); 
    border-radius: 0;
    box-shadow: 0 0 3px rgba(196, 30, 58, 0.4);
}

section { padding: 80px 0; }
section:nth-of-type(odd) { background-color: var(--light-color); }

/* 按钮样式 - 中式圆角+朱砂红 */
.btn {
    display: inline-block; 
    padding: 12px 32px; 
    background-color: var(--primary-color);
    color: var(--white-color); 
    text-decoration: none; 
    border-radius: 2px;
    font-weight: 500;
    transition: all 0.3s ease; 
    border: none; 
    cursor: pointer;
    letter-spacing: 1px;
    box-shadow: 0 2px 5px rgba(196, 30, 58, 0.2);
}
.btn:hover { 
    background-color: var(--secondary-color); 
    transform: translateY(-2px); 
    color: #fff; 
    box-shadow: 0 4px 8px rgba(196, 30, 58, 0.3);
}

/* --- 2. 头部与导航 --- */
.main-header { 
    background-color: var(--white-color); 
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05); 
    position: sticky; 
    top: 0; 
    z-index: 1000; 
    width: 100%; 
    border-bottom: 1px solid var(--border-color);
}
.main-header .container { display: flex; justify-content: space-between; align-items: center; height: 76px; }
.logo { 
    font-size: 1.9rem; 
    font-weight: bold; 
    color: var(--dark-color); 
    text-decoration: none; 
    letter-spacing: 1px;
    font-family: "华文楷体", "STKaiti", "KaiTi", serif;
}
.logo:hover { color: var(--primary-color); }

/* 导航样式 */
.main-nav ul { display: flex; list-style: none; }
.main-nav ul li { margin-left: 36px; }
.main-nav ul li a { 
    text-decoration: none; 
    color: var(--text-color); 
    font-weight: 500; 
    position: relative; 
    padding: 8px 0; 
    letter-spacing: 0.5px;
}
.main-nav ul li a::after { 
    content: ''; 
    position: absolute; 
    bottom: 0; 
    left: 0; 
    width: 0; 
    height: 2px; 
    background-color: var(--primary-color); 
    transition: width 0.4s ease;
    border-radius: 1px;
}
.main-nav ul li a:hover::after, .main-nav ul li a.active::after { width: 100%; }
.main-nav ul li a.active { color: var(--primary-color); }

.menu-toggle { 
    display: none; 
    cursor: pointer; 
    background: none; 
    border: none; 
    font-size: 1.5rem; 
    color: var(--dark-color); 
}

/* --- 3. 英雄区域 --- */
#hero {
    background: linear-gradient(135deg, var(--dark-color), var(--primary-color));
    color: var(--white-color); 
    height: 80vh; 
    min-height: 500px;
    display: flex; 
    align-items: center; 
    justify-content: center; 
    text-align: center; 
    padding: 0 20px;
    background-image: var(--texture-bg), linear-gradient(135deg, var(--dark-color), var(--primary-color));
    background-blend-mode: overlay;
}
#hero h1 { 
    font-size: 3.8rem; 
    color: var(--white-color); 
    margin-bottom: 1.2rem; 
    letter-spacing: 3px;
    font-family: "华文楷体", "STKaiti", "KaiTi", serif;
}
#hero p { 
    font-size: 1.25rem; 
    max-width: 700px; 
    margin: 0 auto 2.5rem; 
    opacity: 0.95; 
    letter-spacing: 1px;
}

/* --- 4. 解决方案（文化服务）--- */
.solutions-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 36px; }
.solution-card { 
    background-color: var(--white-color); 
    padding: 36px 24px; 
    border-radius: 4px; 
    box-shadow: var(--shadow); 
    text-align: center; 
    transition: all 0.4s ease;
    border: 1px solid var(--border-color);
}
.solution-card:hover { 
    transform: translateY(-8px); 
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

/* 图标基础样式 */
.solution-icon { 
    width: 70px; 
    height: 70px; 
    margin: 0 auto 24px; 
    background-color: var(--primary-color); 
    border-radius: 50%; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    position: relative; 
    color: var(--white-color);
    font-size: 24px;
}
/* 笔墨图标 (对应：企业级云服务) */
.icon-cloud::before { 
    content: '';
    position: absolute;
    width: 32px; 
    height: 6px; 
    background: #fff; 
    border-radius: 3px; 
    top: 32px; 
    left: 15px; 
}
.icon-cloud::after { 
    content: '';
    position: absolute;
    width: 20px; 
    height: 20px; 
    background: #fff; 
    border-radius: 50%; 
    top: 20px; 
    left: 30px;
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); 
}
/* 书卷图标 (对应：大数据与分析) 
   修正：移除了对 span 的依赖，仅使用伪元素，适配 index.php 的空 div 结构 */
.icon-data::before { 
    content: '';
    position: absolute;
    width: 32px; /* 书卷主体宽度 */
    height: 36px; 
    background: transparent;
    border: 2px solid #fff;
    border-radius: 2px 6px 6px 2px;
    left: 16px;
    top: 17px;
    border-left: 4px solid #fff; /* 书脊 */
}
.icon-data::after { 
    content: '';
    position: absolute;
    width: 16px; 
    height: 2px; 
    background: #fff; 
    left: 24px; 
    top: 26px; 
    box-shadow: 0 8px 0 #fff; /* 模拟文字行 */
}

/* 印章图标 (对应：网络安全) */
.icon-security::before { 
    content: '';
    position: absolute;
    width: 32px; 
    height: 32px; 
    border: 3px solid #fff; 
    border-radius: 4px; 
}
.icon-security::after { 
    content: '印'; 
    color: var(--white-color); /* 修正颜色，背景是红的，字应该是白的 */
    font-weight: bold; 
    font-size: 18px; 
    font-family: "华文楷体", "STKaiti", serif;
    position: absolute;
}
/* 创意图标 (对应：人工智能) */
.icon-ai { 
    background: linear-gradient(45deg, #C41E3A, #E64340); 
}
.icon-ai::before { 
    content: '';
    position: absolute;
    width: 22px; 
    height: 22px; 
    border-radius: 50%; 
    border: 2px solid #fff; 
    left: 18px;
}
.icon-ai::after { 
    content: '';
    position: absolute;
    width: 12px; 
    height: 22px; 
    border-radius: 2px; 
    border: 2px solid #fff; 
    left: 42px; 
}
/* 传播图标 (对应：物联网) */
.icon-iot::before { 
    content: '';
    position: absolute;
    width: 6px; 
    height: 6px; 
    background: #fff; 
    border-radius: 50%; 
    left: 32px;
    top: 32px;
}
.icon-iot::after { 
    content: '';
    position: absolute;
    width: 40px;
    height: 40px;
    border: 2px solid #fff;
    border-radius: 50%;
    top: 15px;
    left: 15px;
    opacity: 0.6;
    transform: scale(0.6);
    box-shadow: 0 0 0 4px rgba(255,255,255,0.2); /* 利用 box-shadow 模拟波纹，避免依赖额外 DOM */
}
/* 咨询图标 */
.icon-consult::before { 
    content: '';
    position: absolute;
    width: 30px; 
    height: 2px; 
    background: #fff; 
    top: 34px;
}
.icon-consult::after { 
    content: ''; 
    position: absolute;
    width: 0; 
    height: 0; 
    border-left: 12px solid transparent; 
    border-right: 12px solid transparent; 
    border-top: 10px solid #fff; 
    top: 36px; 
    left: 23px; 
}

.solution-card h3 { 
    font-size: 1.6rem; 
    color: var(--primary-color); 
    letter-spacing: 1px;
}
.solution-card p {
    margin-top: 12px;
    line-height: 1.8;
    color: var(--text-color);
}

/* --- 5. 关于我们 --- */
#about .about-content { display: flex; align-items: center; gap: 60px; }
.about-text { flex: 1; }
.about-text p { margin-bottom: 1.2rem; line-height: 1.8; }
.about-visual {
    flex: 1; 
    height: 320px; 
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px; 
    display: flex; 
    align-items: center; 
    justify-content: center;
    color: var(--white-color); 
    font-size: 1.6rem; 
    font-weight: 500; 
    box-shadow: var(--shadow);
    position: relative; 
    overflow: hidden;
    font-family: "华文楷体", "STKaiti", "KaiTi", serif;
    letter-spacing: 2px;
    background-image: var(--texture-bg), linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    background-blend-mode: overlay;
}
.about-visual::before {
    content: ''; 
    position: absolute; 
    width: 200%; 
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.12) 1px, transparent 1px);
    background-size: 24px 24px; 
    animation: move-dots 25s linear infinite;
}
@keyframes move-dots { from { transform: translate(0, 0); } to { transform: translate(-50%, -50%); } }
.about-visual span { z-index: 1; }
.about-action { margin-top: 2rem; }

/* --- 6. 最新动态 --- */
.news-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; }
.news-card {
    background-color: var(--white-color); 
    border-radius: 4px; 
    box-shadow: var(--shadow);
    overflow: hidden; 
    display: flex; 
    flex-direction: column; 
    transition: all 0.4s ease;
    border: 1px solid var(--border-color);
}
.news-card:hover { 
    transform: translateY(-5px); 
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

/* 资讯封面 - 文化渐变 */
.news-cover {
    height: 200px; 
    width: 100%; 
    overflow: hidden; 
    position: relative;
    background-image: linear-gradient(to right, #C41E3A, #E64340);
}
.news-card:nth-child(2n) .news-cover { background-image: linear-gradient(to right, #8B4513, #C41E3A); }
.news-card:nth-child(3n) .news-cover { background-image: linear-gradient(to right, #2D2D2D, #4A4A4A); }

/* 图片样式 */
.news-cover img {
    width: 100%; 
    height: 100%; 
    object-fit: cover; 
    display: block;
    transition: transform 0.6s ease;
}
.news-card:hover .news-cover img { transform: scale(1.08); }

.news-content { 
    padding: 24px; 
    flex-grow: 1; 
    display: flex; 
    flex-direction: column; 
}
.news-content h4 { 
    font-size: 1.3rem; 
    margin-bottom: 0.8rem; 
    letter-spacing: 0.5px;
}
.news-content h4 a { 
    text-decoration: none; 
    color: var(--dark-color); 
    transition: color 0.3s; 
}
.news-content h4 a:hover { color: var(--primary-color); }

.news-meta { 
    font-size: 0.85rem; 
    color: #777; 
    margin-bottom: 1.2rem; 
    display: flex; 
    gap: 12px; 
}
/* 资讯分类链接 */
.news-meta a { 
    color: inherit; 
    text-decoration: none; 
    transition: all 0.3s ease; 
}
.news-meta a:hover { 
    color: var(--primary-color); 
    text-decoration: underline; 
}

.news-content p { 
    flex-grow: 1; 
    margin-bottom: 1.2rem; 
    font-size: 0.95rem; 
    color: #555; 
    line-height: 1.8; 
}
.read-more-link { 
    text-decoration: none; 
    color: var(--primary-color); 
    font-weight: 500; 
    align-self: flex-start; 
    letter-spacing: 0.5px;
}
.read-more-link:hover { 
    text-decoration: underline; 
}

/* --- 7. FAQ --- */
.faq-accordion { max-width: 800px; margin: 0 auto; }
.faq-item { 
    border-bottom: 1px solid var(--border-color); 
    transition: all 0.3s ease;
}
.faq-item:hover {
    background-color: rgba(245, 240, 230, 0.5);
}
.faq-question {
    width: 100%; 
    background: none; 
    border: none; 
    text-align: left; 
    padding: 22px;
    padding-right: 40px; /* 修正：增加右侧内边距，防止文字覆盖加号 */
    font-size: 1.15rem; 
    font-weight: 500; 
    cursor: pointer; 
    display: flex;
    justify-content: space-between; 
    align-items: center; 
    color: var(--dark-color);
    letter-spacing: 0.5px;
    font-family: inherit; /* 继承body字体 */
}
.faq-question::after { 
    content: '+'; 
    font-size: 1.6rem; 
    color: var(--primary-color); 
    transition: transform 0.3s ease;
    font-family: "Arial", sans-serif; /* 符号使用无衬线更清晰 */
    flex-shrink: 0; /* 防止加号被压缩 */
}
.faq-item.active .faq-question::after { transform: rotate(45deg); }
.faq-answer { 
    max-height: 0; 
    overflow: hidden; 
    transition: max-height 0.4s ease, padding 0.4s ease; 
    padding: 0 22px; 
}
.faq-item.active .faq-answer { padding: 0 22px 22px; }

.faq-answer p {
    color: #555;
    font-size: 0.95rem;
    line-height: 1.8;
    border-top: 1px dashed rgba(196, 30, 58, 0.2); 
    padding: 18px 0;
    margin-top: 10px;
}

/* --- 8. Footer --- */
.main-footer { 
    background-color: var(--dark-color); 
    color: var(--light-color); 
    padding: 70px 0 24px; 
    margin-top: auto; 
    background-image: var(--texture-bg);
    background-blend-mode: overlay;
}
.footer-content { 
    display: flex; 
    justify-content: space-between; 
    flex-wrap: wrap; 
    gap: 40px; 
    margin-bottom: 40px; 
}
.footer-column { flex: 1; min-width: 220px; }
.footer-column h4 { 
    color: var(--white-color); 
    margin-bottom: 1.2rem; 
    font-size: 1.3rem; 
    letter-spacing: 1px;
    font-family: "华文楷体", "STKaiti", "KaiTi", serif;
}
.footer-column ul { list-style: none; }
.footer-column ul li { margin-bottom: 12px; }
.footer-column ul li a { 
    color: #ccc; 
    text-decoration: none; 
    transition: all 0.3s ease; 
    letter-spacing: 0.5px;
}
.footer-column ul li a:hover { 
    color: var(--white-color); 
    padding-left: 4px; 
}
.footer-bottom { 
    text-align: center; 
    padding-top: 24px; 
    border-top: 1px solid #444; 
    font-size: 0.9rem; 
    color: #ccc; 
    letter-spacing: 0.5px;
}

/* --- CMS 页面样式 --- */
.breadcrumb { 
    padding: 24px 0; 
    font-size: 0.95rem; 
    color: #666; 
    border-bottom: 1px solid var(--border-color); 
    margin-bottom: 36px; 
}
.breadcrumb a { 
    color: var(--text-color); 
    text-decoration: none; 
    transition: color 0.3s ease;
}
.breadcrumb a:hover { color: var(--primary-color); }
.breadcrumb span { margin: 0 12px; color: #ccc; }

.page-container { padding: 70px 0 100px; }
.page-header { text-align: left; margin-bottom: 40px; }
.page-header h1 { 
    font-size: 2.3rem; 
    color: var(--dark-color); 
    letter-spacing: 1px;
    font-family: "华文楷体", "STKaiti", "KaiTi", serif;
}
.page-meta { 
    color: #888; 
    font-size: 0.95rem; 
    margin-top: 12px; 
}
.page-meta a {
    color: inherit; 
    text-decoration: none;
    transition: all 0.3s ease;
}
.page-meta a:hover {
    color: var(--primary-color); 
    text-decoration: underline;
}

/* 分页样式 */
.pagination { 
    display: flex; 
    justify-content: center; 
    gap: 12px; 
    margin-top: 60px; 
}
.page-btn { 
    display: inline-flex; 
    align-items: center; 
    justify-content: center; 
    width: 42px; 
    height: 42px; 
    border: 1px solid var(--border-color); 
    border-radius: 2px; 
    color: var(--text-color); 
    text-decoration: none; 
    transition: all 0.3s; 
    font-family: "SimHei", sans-serif;
}
.page-btn:hover { 
    background-color: var(--primary-color); 
    color: #fff; 
    border-color: var(--primary-color); 
}
.page-current { 
    display: inline-flex; 
    align-items: center; 
    height: 42px; 
    padding: 0 18px; 
    font-weight: bold; 
    color: var(--dark-color); 
    letter-spacing: 0.5px;
}

/* Markdown 内容样式 */
.markdown-body { 
    color: var(--text-color); 
    font-size: 1.05rem; 
    line-height: 1.9; 
    max-width: 100%; 
    overflow-x: hidden; 
}
.markdown-body h2 { 
    font-size: 1.9rem; 
    margin-top: 2.8rem; 
    margin-bottom: 1.6rem; 
    padding-bottom: 12px; 
    border-bottom: 2px solid var(--light-color); 
    text-align: left; 
    letter-spacing: 1px;
}
.markdown-body h2::after { display: none; }
.markdown-body h3 { 
    font-size: 1.5rem; 
    margin-top: 2.2rem; 
    margin-bottom: 1.2rem; 
    letter-spacing: 0.5px;
}
.markdown-body p { margin-bottom: 1.8rem; }
.markdown-body ul, .markdown-body ol { 
    padding-left: 24px; 
    margin-bottom: 1.8rem; 
}
.markdown-body li { margin-bottom: 0.8rem; }
.markdown-body img { 
    max-width: 100%; 
    height: auto; 
    border-radius: 4px; 
    margin: 24px 0; 
    box-shadow: var(--shadow); 
    border: 1px solid var(--border-color);
}
.markdown-body blockquote { 
    border-left: 4px solid var(--primary-color); 
    background-color: #f9f5f0; 
    padding: 24px; 
    margin: 24px 0; 
    border-radius: 0 4px 4px 0; 
    font-style: italic; 
    color: #555; 
}
.markdown-body a { 
    color: var(--primary-color); 
    text-decoration: none; 
    border-bottom: 1px dashed var(--primary-color); 
}
.markdown-body a:hover { border-bottom-style: solid; }
.markdown-body hr { 
    border: 0; 
    height: 1px; 
    background: var(--border-color); 
    margin: 48px 0; 
}
.markdown-body pre { 
    background: #2D2D2D; 
    color: #fff; 
    padding: 24px; 
    border-radius: 4px; 
    overflow-x: auto; 
    margin-bottom: 24px; 
}

/* 标签样式 */
.post-tags { 
    margin-top: 48px; 
    padding-top: 24px; 
    border-top: 1px solid var(--border-color); 
}
.tag-pill { 
    display: inline-block; 
    background: var(--light-color); 
    padding: 8px 18px; 
    border-radius: 20px; 
    color: #666; 
    text-decoration: none; 
    font-size: 0.85rem; 
    margin-right: 12px; 
    margin-bottom: 12px; 
    border: 1px solid var(--border-color); 
    transition: all 0.3s; 
    letter-spacing: 0.5px;
}
.tag-pill:hover { 
    background: var(--primary-color); 
    color: #fff; 
    border-color: var(--primary-color); 
}

/* 文章导航 */
.post-navigation { 
    display: flex; 
    justify-content: space-between; 
    margin-top: 48px; 
    padding-top: 24px; 
    border-top: 1px solid var(--border-color); 
}
.nav-next, .nav-prev { 
    max-width: 45%; 
    text-decoration: none; 
    color: var(--dark-color); 
    font-weight: 500; 
}
.nav-next:hover, .nav-prev:hover { color: var(--primary-color); }
.nav-next span, .nav-prev span { 
    display: block; 
    font-size: 0.85rem; 
    color: #999; 
    font-weight: normal; 
    margin-bottom: 6px; 
}

/* 404页面 */
.error-page { 
    text-align: center; 
    padding: 120px 0; 
}
.error-page h1 { 
    font-size: 5.5rem; 
    color: var(--primary-color); 
    margin-bottom: 0; 
    font-family: "STKaiti", "KaiTi", serif;
}
.error-page p { 
    font-size: 1.6rem; 
    margin-bottom: 36px; 
    letter-spacing: 1px;
}
.no-content { 
    text-align: center; 
    padding: 60px; 
    color: #999; 
    background: var(--light-color); 
    border-radius: 4px; 
    border: 1px solid var(--border-color);
}

/* 响应式适配 */
@media (max-width: 992px) { 
    h2 { font-size: 2.2rem; } 
    #hero h1 { font-size: 3rem; } 
    #about .about-content { gap: 40px; }
}

@media (max-width: 768px) {
    .logo { font-size: 1.6rem; }

    .menu-toggle { display: block; }
    .main-nav { 
        position: absolute; 
        top: 76px; 
        left: 0; 
        width: 100%; 
        background-color: var(--white-color); 
        flex-direction: column; 
        max-height: 0; 
        overflow: hidden; 
        transition: max-height 0.4s ease-in-out; 
        box-shadow: 0 8px 12px rgba(0,0,0,0.08);
        border-bottom: 1px solid var(--border-color);
    }
    .main-nav.active { max-height: 500px; }
    .main-nav ul { flex-direction: column; padding: 12px 0; }
    .main-nav ul li { margin: 0; text-align: center; }
    .main-nav ul li a { display: block; padding: 16px 20px; }
    .main-nav ul li a::after { display: none; }
    
    #about .about-content { flex-direction: column; }
    .about-visual { height: 260px; }
    
    .footer-content { flex-direction: column; text-align: center; }
    .footer-column { min-width: 100%; }
}

@media (max-width: 480px) { 
    #hero h1 { font-size: 2.4rem; } 
    #hero p { font-size: 1.1rem; } 
    section { padding: 60px 0; } 
    h2 { font-size: 1.9rem; } 
    .solutions-grid { gap: 24px; }
    .solution-card { padding: 24px 16px; }
}