/* ==========================================================================
   TxtPress Theme: Industrial & Trade (工贸企业重工风格)
   ========================================================================== */

/* --- 1. 全局变量与硬核工业色彩 --- */
:root {
    /* 核心色彩 - 工业深蓝与动能亮橙 */
    --primary-color: #0B1E36; /* 极深的海军蓝，代表稳重与国际化 */
    --secondary-color: #1A365D; /* 稍微亮一点的工业蓝 */
    --accent-color: #F97316; /* 亮橙色/安全橙，代表活力、制造、警示与动能 */
    
    /* 中性灰度 - 金属与混凝土质感 */
    --text-main: #1E293B;
    --text-muted: #64748B;
    --bg-body: #F1F5F9; /* 略带冷色的背景 */
    --bg-surface: #FFFFFF;
    --border-light: #E2E8F0;
    --border-dark: #94A3B8;
    
    /* 视觉属性 - 硬朗直角，无过度圆润 */
    --radius-sm: 0px; 
    --radius-md: 2px;
    --radius-lg: 4px;
    --shadow-sm: 0 1px 2px rgba(11, 30, 54, 0.08);
    --shadow-md: 0 8px 16px -4px rgba(11, 30, 54, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(11, 30, 54, 0.15);
    --transition: all 0.25s ease-in-out;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-body);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

main { flex: 1; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; width: 100%; }

h1, h2, h3, h4, h5, h6 { 
    color: var(--primary-color); 
    font-weight: 700; 
    line-height: 1.3; 
    letter-spacing: -0.02em;
}

h2 { 
    font-size: 2.5rem; 
    text-align: left; /* 改为左对齐，更大气 */
    margin-bottom: 3rem; 
    position: relative; 
    padding-bottom: 15px;
}
/* 标题底部的橙色重工线条 */
h2::after { 
    content: ''; 
    position: absolute; 
    bottom: 0; 
    left: 0; 
    width: 60px; 
    height: 4px; 
    background-color: var(--accent-color); 
}

section { padding: 100px 0; }
section:nth-of-type(even) { background-color: var(--bg-surface); }

/* 全局按钮样式 - 几何直角方块 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    background-color: var(--accent-color);
    color: #FFFFFF;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
    border: 1px solid var(--accent-color);
    cursor: pointer;
}
.btn:hover { 
    background-color: transparent; 
    color: var(--accent-color); 
}

/* --- 2. 头部导航 (硬朗商务风) --- */
.main-header { 
    background-color: #FFFFFF; 
    border-bottom: 3px solid var(--primary-color); /* 底部深蓝粗线 */
    position: sticky; 
    top: 0; 
    z-index: 1000; 
    width: 100%; 
    box-shadow: var(--shadow-sm);
}
.main-header .container { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    height: 90px; 
}
.logo { 
    font-size: 1.8rem; 
    font-weight: 900; 
    color: var(--primary-color); 
    text-decoration: none; 
    letter-spacing: 1px;
    text-transform: uppercase;
    display: flex;
    align-items: center;
}
/* Logo 旁的橙色工业点缀 */
.logo::before {
    content: '';
    display: inline-block;
    width: 12px;
    height: 12px;
    background-color: var(--accent-color);
    margin-right: 10px;
}

.main-nav ul { display: flex; list-style: none; }
.main-nav ul li { margin-left: 35px; position: relative; }
.main-nav ul li a { 
    text-decoration: none; 
    color: var(--primary-color); 
    font-weight: 600; 
    font-size: 1rem;
    transition: var(--transition);
    padding: 10px 0;
}
/* 导航悬停底部拉出橙色线 */
.main-nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width 0.3s;
}
.main-nav ul li a:hover::after, .main-nav ul li a.active::after { 
    width: 100%; 
}
.main-nav ul li a:hover, .main-nav ul li a.active { 
    color: var(--accent-color); 
}
.menu-toggle { display: none; cursor: pointer; background: none; border: none; font-size: 2rem; color: var(--primary-color); }

/* --- 3. 首页 Hero 区域 (蓝图/网格重工背景) --- */
#hero {
    background-color: var(--primary-color);
    /* 纯CSS生成的工程图纸/网格线 */
    background-image: 
        linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    position: relative;
    color: #FFFFFF; 
    padding: 160px 20px;
    display: flex; 
    align-items: center; 
    justify-content: flex-start; /* 居左对齐 */
}
#hero::before {
    content: '';
    position: absolute;
    top: 0; right: 0; bottom: 0; width: 50%;
    /* 右侧斜向光影切角 */
    background: linear-gradient(115deg, transparent 20%, rgba(26, 54, 93, 0.8) 100%);
    z-index: 1;
    pointer-events: none;
}
.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}
#hero h1 { 
    font-size: 4.5rem; 
    color: #FFFFFF; 
    margin-bottom: 1.5rem; 
    letter-spacing: -1px;
    font-weight: 800;
    line-height: 1.1;
    text-shadow: 0 4px 10px rgba(0,0,0,0.3);
}
#hero p { 
    font-size: 1.2rem; 
    color: #CBD5E1;
    margin-bottom: 3rem; 
    font-weight: 400;
    max-width: 600px;
    border-left: 3px solid var(--accent-color);
    padding-left: 20px;
}
#hero .btn {
    background-color: var(--accent-color);
    color: #FFFFFF;
}
#hero .btn:hover {
    background-color: #FFFFFF;
    color: var(--primary-color);
    border-color: #FFFFFF;
}

/* --- 4. 核心产品与服务 (刚硬模块化设计) --- */
#solutions { background-color: var(--bg-body); }
.solutions-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); 
    gap: 1px; /* 用1px间隙配合背景色做出网格线效果 */
    background-color: var(--border-light);
    border: 1px solid var(--border-light);
}
.solution-card { 
    background-color: var(--bg-surface); 
    padding: 50px 40px; 
    transition: var(--transition);
    position: relative;
    z-index: 1;
}
/* 悬停时的边框高亮，不采用浮动跳跃，而是厚重的下压感 */
.solution-card:hover { 
    background-color: var(--primary-color);
}
.solution-card h3 { 
    font-size: 1.3rem; 
    margin-bottom: 15px;
    color: var(--primary-color); 
    transition: var(--transition);
}
.solution-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    transition: var(--transition);
}
.solution-card:hover h3, .solution-card:hover p {
    color: #FFFFFF;
}

/* 纯CSS 重绘工贸类线条图标 */
.solution-icon { 
    width: 60px; height: 60px; 
    margin-bottom: 30px; 
    position: relative; 
    background: transparent;
    color: var(--secondary-color);
    transition: var(--transition);
}
.solution-card:hover .solution-icon { color: var(--accent-color); }
.solution-icon::before, .solution-icon::after { 
    content: ''; position: absolute; box-sizing: border-box; 
}

/* 产品/集装箱 (立体方块) */
.icon-cloud::before { 
    width: 40px; height: 40px; border: 3px solid currentColor;
    top: 10px; left: 10px;
}
.icon-cloud::after { 
    width: 24px; height: 24px; border-bottom: 3px solid currentColor; border-left: 3px solid currentColor;
    top: -2px; left: 26px; transform: skewX(45deg);
}

/* 工业级方案/厂房 (锯齿形顶部) */
.icon-data::before { 
    width: 46px; height: 30px; border: 3px solid currentColor; border-top: none;
    bottom: 5px; left: 7px;
}
.icon-data::after { 
    width: 46px; height: 20px; 
    border-left: 3px solid currentColor; border-bottom: 3px solid currentColor;
    top: 5px; left: 18px; transform: rotate(45deg) scaleX(1.4); transform-origin: left bottom;
}

/* 质量/齿轮与核心 */
.icon-ai::before {
    width: 36px; height: 36px; border: 4px dashed currentColor; border-radius: 50%;
    top: 12px; left: 12px;
}
.icon-ai::after {
    width: 14px; height: 14px; border: 3px solid currentColor; border-radius: 50%;
    top: 23px; left: 23px;
}

/* 安全/坚固盾牌 (直线硬朗版) */
.icon-security::before { 
    width: 40px; height: 44px; border: 3px solid currentColor;
    top: 8px; left: 10px; border-bottom-left-radius: 20px; border-bottom-right-radius: 20px;
}
.icon-security::after {
    width: 46px; height: 3px; background: currentColor;
    top: 16px; left: 7px;
}

/* 仓储物流/全球节点 (网格球) */
.icon-iot::before { 
    width: 44px; height: 44px; border: 3px solid currentColor; border-radius: 50%;
    top: 8px; left: 8px;
}
.icon-iot::after { 
    width: 44px; height: 16px; border: 3px solid currentColor; border-radius: 50%;
    top: 22px; left: 8px;
}

/* 定制服务/图纸剪贴板 */
.icon-consult::before { 
    width: 34px; height: 46px; border: 3px solid currentColor;
    top: 10px; left: 13px;
}
.icon-consult::after { 
    width: 16px; height: 6px; background: currentColor;
    top: 6px; left: 22px;
}

/* --- 5. 关于我们 (集装箱/厂房意象) --- */
#about { background-color: var(--bg-surface); border-top: 1px solid var(--border-light); }
#about .about-content { display: flex; align-items: center; gap: 80px; }
.about-text { flex: 1; }
.about-text h3 { font-size: 1.8rem; margin-bottom: 1.5rem; color: var(--primary-color); }
.about-text p { margin-bottom: 1.5rem; color: var(--text-muted); font-size: 1.05rem; }
.about-action { margin-top: 2.5rem; }

/* 纯CSS绘制的“重工货柜/钢架”抽象视觉 */
.about-visual {
    flex: 1; 
    height: 450px; 
    background-color: var(--bg-body);
    position: relative; 
    overflow: hidden;
    border-left: 10px solid var(--accent-color);
}
.about-visual::before {
    /* 主体深蓝钢板块 */
    content: ''; position: absolute;
    width: 60%; height: 70%;
    background-color: var(--primary-color);
    bottom: 0; left: 10%;
    box-shadow: 20px -20px 0 var(--border-light);
}
.about-visual::after {
    /* 橙色吊机/结构线 */
    content: ''; position: absolute;
    width: 100%; height: 40px;
    border-top: 4px solid var(--accent-color);
    border-bottom: 4px solid var(--accent-color);
    background: repeating-linear-gradient(
      45deg,
      transparent,
      transparent 10px,
      var(--accent-color) 10px,
      var(--accent-color) 12px
    );
    top: 20%; left: 0;
}
.about-visual span { 
    position: absolute;
    z-index: 1; 
    color: #FFFFFF; 
    font-size: 2rem; 
    font-weight: 800; 
    letter-spacing: 2px;
    bottom: 15%; right: 5%;
    text-shadow: 2px 2px 0 var(--primary-color);
}

/* --- 6. 资讯中心 / 新闻卡片 --- */
#news, #content { background-color: var(--bg-body); border-top: 1px solid var(--border-light); }
.news-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); 
    gap: 40px; 
}
.news-card {
    background-color: var(--bg-surface); 
    display: flex; flex-direction: column; 
    transition: var(--transition);
    border: 1px solid var(--border-light);
    border-top: 4px solid transparent; /* 留出橙色线位置 */
}
.news-card:hover { 
    border-top-color: var(--accent-color);
    box-shadow: var(--shadow-lg); 
}

/* 封面无图片时的纯CSS金属对角线纹理 */
.news-cover {
    height: 240px; width: 100%; 
    overflow: hidden; position: relative;
    background-color: #E2E8F0;
    display: flex; align-items: center; justify-content: center;
    background-image: repeating-linear-gradient(
        -45deg,
        transparent,
        transparent 5px,
        rgba(0,0,0,0.03) 5px,
        rgba(0,0,0,0.03) 10px
    );
}
.news-card:nth-child(even) .news-cover { 
    background-color: var(--primary-color);
    background-image: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255,255,255,0.03) 10px,
        rgba(255,255,255,0.03) 20px
    );
}

.news-cover img {
    width: 100%; height: 100%; object-fit: cover; display: block;
    transition: transform 0.8s ease;
    filter: grayscale(20%); /* 增加工业照片质感 */
}
.news-card:hover .news-cover img { transform: scale(1.05); filter: grayscale(0%); }

.news-content { padding: 30px; flex-grow: 1; display: flex; flex-direction: column; }
.news-meta { 
    font-size: 0.85rem; color: var(--text-muted); margin-bottom: 15px; 
    display: flex; gap: 10px; font-weight: 500; text-transform: uppercase;
}
.news-meta a { color: var(--accent-color); text-decoration: none;}
.news-meta a:hover { text-decoration: underline; }

.news-content h4 { font-size: 1.3rem; margin-bottom: 15px; line-height: 1.5; }
.news-content h4 a { text-decoration: none; color: var(--primary-color); transition: color 0.2s; }
.news-content h4 a:hover { color: var(--accent-color); }

.news-content p { flex-grow: 1; margin-bottom: 25px; font-size: 0.95rem; color: var(--text-muted); }
.read-more-link { 
    text-decoration: none; color: var(--primary-color); 
    font-weight: 700; font-size: 0.9rem; align-self: flex-start; 
    display: inline-flex; align-items: center; transition: var(--transition);
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 2px;
}
.read-more-link:hover { color: var(--accent-color); }

/* --- 7. FAQ 严谨手风琴面板 --- */
#faq { background-color: var(--bg-surface); }
.faq-accordion { max-width: 900px; display: flex; flex-direction: column; gap: 0; border: 1px solid var(--border-light); margin: 0 auto; }
.faq-item { 
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-light);
}
.faq-item:last-child { border-bottom: none; }
.faq-question {
    width: 100%; background: none; border: none; text-align: left; padding: 25px 30px;
    font-size: 1.1rem; font-weight: 700; cursor: pointer; display: flex;
    justify-content: space-between; align-items: center; color: var(--primary-color);
    transition: background 0.3s ease; border-left: 4px solid transparent;
}
.faq-question:hover { background-color: var(--bg-body); }
.faq-item.active .faq-question { border-left-color: var(--accent-color); background-color: var(--bg-body); }
.faq-question::after { 
    content: '+'; 
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-muted);
    transition: transform 0.3s ease;
}
.faq-item.active .faq-question::after { content: '−'; color: var(--accent-color); }
.faq-answer { 
    max-height: 0; overflow: hidden; transition: max-height 0.4s ease; 
    background-color: var(--bg-surface);
}
.faq-answer p {
    color: var(--text-muted); font-size: 1rem; line-height: 1.7; padding: 12px 30px 13px 30px; margin: 0;
}

/* --- 8. Footer 企业底栏 (沉稳深版) --- */
.main-footer { background-color: #05101C; color: #94A3B8; padding: 100px 0 30px; margin-top: auto; }
.footer-content { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 50px; margin-bottom: 60px; }
.footer-column { flex: 1; min-width: 240px; }
.footer-column h4 { color: #FFFFFF; margin-bottom: 1.8rem; font-size: 1.2rem; font-weight: 700; position: relative; padding-bottom: 10px; }
.footer-column h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 30px; height: 2px; background: var(--accent-color); }
.footer-column p { color: #94A3B8; font-size: 0.95rem; }
.footer-column ul { list-style: none; }
.footer-column ul li { margin-bottom: 15px; }
.footer-column ul li a { color: #94A3B8; text-decoration: none; font-size: 0.95rem; transition: color 0.3s ease; }
.footer-column ul li a:hover { color: var(--accent-color); }
.footer-bottom { text-align: center; padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.05); font-size: 0.85rem; color: #475569; }

/* --- 9. 内容页 (文章/单页) 专业文档排版 --- */
.page-container { padding: 60px 0 120px; background-color: var(--bg-body); }

.single-post-wrapper { 
    max-width: 960px; /* 拓宽至960px，更符合技术文档和报告的需求 */
    margin: 0 auto; 
    background: var(--bg-surface); 
    padding: 60px 80px; 
    border: 1px solid var(--border-light); 
    box-shadow: var(--shadow-sm); 
    border-top: 6px solid var(--primary-color); /* 顶部企业蓝粗线 */
}

.breadcrumb { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 40px; font-weight: 500; text-transform: uppercase;}
.breadcrumb a { color: var(--primary-color); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent-color); }
.breadcrumb span { margin: 0 12px; color: var(--border-dark); }

.page-header { text-align: left; margin-bottom: 50px; padding-bottom: 30px; border-bottom: 2px solid var(--border-light); }
.center-header { text-align: center; border-bottom: none; }
.page-header h1 { font-size: 2.8rem; color: var(--primary-color); letter-spacing: -1px; margin-bottom: 20px;}
.page-meta { color: var(--text-muted); font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.5px;}
.page-meta a { color: var(--accent-color); text-decoration: none; font-weight: 600;}
.page-meta a:hover { text-decoration: underline; }

/* Markdown 内容排版优化 - 适合规格书/技术新闻 */
.markdown-body { color: var(--text-main); font-size: 1.15rem; line-height: 1.8; word-wrap: break-word; }
.markdown-body h2 { font-size: 1.8rem; margin: 3rem 0 1.5rem; color: var(--primary-color); border-bottom: 1px solid var(--border-light); padding-bottom: 10px; }
.markdown-body h2::after { display: none; }
.markdown-body h3 { font-size: 1.4rem; margin: 2rem 0 1rem; color: var(--primary-color); font-weight: 700; }
.markdown-body p { margin-bottom: 1.5rem; }
.markdown-body ul, .markdown-body ol { padding-left: 25px; margin-bottom: 1.5rem; color: var(--text-main); }
.markdown-body li { margin-bottom: 0.5rem; }
.markdown-body li > ul, .markdown-body li > ol { margin-top: 0.5rem; margin-bottom: 0; } /* 修复嵌套列表间距过大 */

/* 新增：产品规格/技术参数 表格规范化样式 */
.markdown-body table { width: 100%; border-collapse: collapse; margin-bottom: 2rem; font-size: 1rem; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border-light); padding: 12px 16px; text-align: left; }
.markdown-body th { background-color: var(--primary-color); color: #FFFFFF; font-weight: 600; }
.markdown-body tr:nth-child(even) { background-color: var(--bg-body); }

.markdown-body img { max-width: 100%; height: auto; border: 1px solid var(--border-light); margin: 2rem auto; display: block; background: #F8FAFC; padding: 10px;}
.markdown-body blockquote { 
    border-left: 6px solid var(--accent-color); 
    background-color: var(--bg-body); 
    padding: 25px 30px; margin: 2.5rem 0; 
    color: var(--primary-color); font-style: italic;
    font-size: 1.2rem;
}
.markdown-body a { color: var(--accent-color); text-decoration: none; border-bottom: 1px solid var(--accent-color); transition: opacity 0.2s; }
.markdown-body a:hover { opacity: 0.7; }
.markdown-body hr { border: 0; height: 1px; background: var(--border-light); margin: 3rem 0; }
.markdown-body pre { background: var(--primary-color); color: #E2E8F0; padding: 25px; overflow-x: auto; margin-bottom: 2rem; font-size: 0.95rem; border-left: 4px solid var(--accent-color); }
.markdown-body code { font-family: Consolas, "Liberation Mono", Menlo, monospace; background: var(--bg-body); color: var(--accent-color); padding: 2px 6px; font-size: 0.9em; border: 1px solid var(--border-light); }
.markdown-body pre code { background: none; color: inherit; padding: 0; border: none; }

.post-tags { margin-top: 60px; padding-top: 30px; border-top: 1px solid var(--border-light); display: flex; flex-wrap: wrap; gap: 12px; }
.tag-pill { 
    display: inline-block; background: var(--bg-body); padding: 6px 14px; 
    color: var(--text-muted); text-decoration: none; text-transform: uppercase;
    font-size: 0.85rem; font-weight: 600; transition: var(--transition); border: 1px solid var(--border-light); 
}
.tag-pill:hover { background: var(--primary-color); color: #FFFFFF; border-color: var(--primary-color); }

.post-navigation { display: flex; justify-content: space-between; margin-top: 40px; padding-top: 40px; border-top: 1px solid var(--border-light); }
.nav-next, .nav-prev { max-width: 45%; text-decoration: none; color: var(--primary-color); font-weight: 700; line-height: 1.4; transition: color 0.2s; }
.nav-next:hover, .nav-prev:hover { color: var(--accent-color); }
.nav-next span, .nav-prev span { display: block; font-size: 0.85rem; color: var(--text-muted); font-weight: 600; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }
.nav-next { text-align: right; }

/* 分页组件 (硬朗方形) */
.pagination { display: flex; justify-content: center; align-items: center; gap: 10px; margin-top: 70px; }
.page-btn { 
    display: inline-flex; align-items: center; justify-content: center; 
    width: 44px; height: 44px; border: 1px solid var(--border-dark); 
    color: var(--primary-color); 
    text-decoration: none; transition: var(--transition); background: var(--bg-surface); font-weight: 600;
}
.page-btn:hover { background-color: var(--primary-color); color: #FFFFFF; border-color: var(--primary-color); }
.page-current { display: inline-flex; align-items: center; height: 44px; padding: 0 20px; font-weight: 700; color: #FFFFFF; background: var(--accent-color); }

/* 404 & 无内容 */
.error-page { text-align: center; padding: 150px 0; }
.error-page h1 { font-size: 8rem; color: var(--border-light); margin-bottom: 20px; line-height: 1; }
.error-page p { font-size: 1.25rem; margin-bottom: 40px; color: var(--text-muted); }

.no-content { 
    grid-column: 1 / -1; 
    text-align: center; 
    padding: 80px 20px; 
    color: var(--text-muted); 
    background: var(--bg-surface); 
    border: 2px dashed var(--border-dark); 
    font-weight: 600;
}

/* --- 10. 响应式适配 --- */
@media (max-width: 1024px) {
    .single-post-wrapper { padding: 50px; }
}

@media (max-width: 992px) { 
    h2 { font-size: 2.2rem; } 
    #hero h1 { font-size: 3.5rem; }
    .about-visual { height: 350px; }
    #about .about-content { gap: 40px; }
}

@media (max-width: 768px) {
    .main-header .container { height: 75px; }
    .logo { font-size: 1.5rem; }
    .menu-toggle { display: block; }
    
    .main-nav { 
        position: absolute; top: 75px; left: 0; width: 100%; 
        background-color: #FFFFFF;
        max-height: 0; overflow: hidden; transition: max-height 0.4s ease-out; 
        box-shadow: var(--shadow-md); border-top: 1px solid var(--border-light);
    }
    .main-nav.active { max-height: 600px; }
    .main-nav ul { flex-direction: column; padding: 0; }
    .main-nav ul li { margin: 0; border-bottom: 1px solid var(--bg-body); }
    .main-nav ul li a { display: block; padding: 20px 24px; font-size: 1.05rem; }
    .main-nav ul li a::after { display: none; } /* 移动端不显示底部滑线 */
    
    #hero { height: auto; padding: 100px 20px 80px; }
    #hero h1 { font-size: 2.8rem; }
    #hero p { font-size: 1.1rem; }
    
    #about .about-content { flex-direction: column; }
    .about-visual { width: 100%; }
    .footer-content { flex-direction: column; gap: 40px; }
    
    .single-post-wrapper { padding: 30px 20px; border-left: none; border-right: none; }
    .page-header h1 { font-size: 2.2rem; }
}

@media (max-width: 480px) { 
    section { padding: 70px 0; } 
    h2 { font-size: 1.8rem; margin-bottom: 2rem; } 
    
    /* 修复极小屏幕下网格溢出导致的横向滚动条Bug */
    .solutions-grid, .news-grid { grid-template-columns: 1fr; }
    
    .news-cover { height: 200px; }
    .post-navigation { flex-direction: column; gap: 25px; }
    .nav-next, .nav-prev { max-width: 100%; }
    .nav-next { text-align: left !important; }
    
    /* 优化极小屏幕下的 FAQ 内边距，避免文字拥挤 */
    .faq-question { padding: 15px 20px; font-size: 1rem; }
    .faq-answer p { padding: 10px 20px; }
}