/* ============ 全局变量 ============ */
:root{
    --primary:#1a73e8;
    --primary-dark:#0d47a1;
    --primary-light:#e8f0fe;
    --text:#222;
    --text-light:#666;
    --text-mute:#999;
    --bg-gray:#f5f7fa;
    --white:#fff;
    --border:#e5e8ee;
    --radius:10px;
    --shadow:0 4px 16px rgba(0,0,0,0.06);
    --shadow-lg:0 12px 32px rgba(0,0,0,0.10);
    --header-h:64px;
}

/* ============ 重置 ============ */
*{margin:0;padding:0;box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
    font-family:'Inter','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
    color:var(--text);
    line-height:1.65;
    background:var(--white);
    font-size:15px;
    -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit;transition:color .2s;}
img{max-width:100%;height:auto;display:block;}
ul,ol{list-style:none;}
button{font-family:inherit;cursor:pointer;}
.container{max-width:1200px;margin:0 auto;padding:0 20px;}
.container.narrow{max-width:860px;}

/* ============ 顶部 Header ============ */
.site-header{
    background:#fff;
    border-bottom:1px solid var(--border);
    position:sticky;
    top:0;
    z-index:900;
}
.header-inner{
    max-width:1200px;
    margin:0 auto;
    padding:0 20px;
    height:var(--header-h);
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:20px;
}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.logo-img{height:36px;}
.logo-text{font-size:20px;font-weight:800;color:var(--primary);letter-spacing:-0.3px;}

.main-nav ul{display:flex;gap:2px;}
.main-nav li a{
    display:flex;align-items:center;gap:6px;
    padding:8px 14px;border-radius:8px;
    font-size:14px;font-weight:500;
    color:var(--text);white-space:nowrap;
}
.main-nav li a i{font-size:13px;opacity:.7;}
.main-nav li a:hover{background:var(--primary-light);color:var(--primary);}
.main-nav li a.active{background:var(--primary-light);color:var(--primary);font-weight:600;}
.main-nav li a.active i{opacity:1;}

.header-actions{display:flex;gap:10px;flex-shrink:0;}

.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:6px;
    padding:9px 18px;border-radius:8px;
    font-size:14px;font-weight:600;
    border:none;transition:all .2s;
    cursor:pointer;white-space:nowrap;
}
.btn-primary{background:linear-gradient(135deg,#1a73e8,#0d47a1);color:#fff;box-shadow:0 4px 12px rgba(26,115,232,.25);}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(26,115,232,.35);}
.btn-outline{background:#fff;color:var(--primary);border:1px solid var(--primary);}
.btn-outline:hover{background:var(--primary-light);}
.btn-light{background:#fff;color:var(--primary);}
.btn-light:hover{background:#f0f7ff;}
.btn-ghost{background:rgba(255,255,255,.15);color:#fff;border:1px solid rgba(255,255,255,.5);}
.btn-ghost:hover{background:rgba(255,255,255,.25);}
.btn-lg{padding:14px 30px;font-size:16px;border-radius:10px;}
.btn-mini{padding:5px 12px;font-size:12px;background:var(--primary-light);color:var(--primary);border-radius:6px;font-weight:600;}
.btn-mini:hover{background:var(--primary);color:#fff;}

.header-qq{
    text-align:center;padding:4px 0 6px;font-size:13px;
    background:#f8f9fc;border-bottom:1px solid var(--border);
}
.header-qq a{color:var(--primary);font-weight:500;}
.header-qq i{margin-right:4px;}

.mobile-toggle{
    display:none;background:none;border:none;
    font-size:22px;color:var(--text);padding:8px;
}

/* ============ Hero ============ */
.hero{
    background:linear-gradient(135deg,#0d47a1 0%,#1a73e8 50%,#42a5f5 100%);
    color:#fff;padding:90px 20px 80px;text-align:center;position:relative;overflow:hidden;
}
.hero::after{
    content:'';position:absolute;inset:0;
    background:radial-gradient(circle at 80% 20%,rgba(255,255,255,.15),transparent 50%);
    pointer-events:none;
}
.hero-inner{max-width:820px;margin:0 auto;position:relative;z-index:1;}
.hero h1{font-size:46px;font-weight:800;line-height:1.2;margin-bottom:18px;letter-spacing:-1px;}
.hero p{font-size:17px;opacity:.92;margin-bottom:36px;}
.hero-stats{display:flex;justify-content:center;gap:48px;margin-bottom:40px;flex-wrap:wrap;}
.hero-stats .stat{text-align:center;}
.hero-stats .num{display:block;font-size:30px;font-weight:800;line-height:1.2;}
.hero-stats .label{font-size:13px;opacity:.8;display:block;margin-top:4px;}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}

/* ============ 页面小 Hero ============ */
.page-hero{
    background:linear-gradient(135deg,#0d47a1,#1a73e8);
    color:#fff;padding:60px 20px;text-align:center;
}
.page-hero.small{padding:44px 20px;}
.page-hero h1{font-size:32px;font-weight:800;margin-bottom:8px;letter-spacing:-0.5px;}
.page-hero p{font-size:15px;opacity:.9;}

/* ============ 通用区块 ============ */
.section{padding:72px 0;}
.section-gray{background:var(--bg-gray);}
.section-title{
    font-size:30px;font-weight:800;text-align:center;
    margin-bottom:44px;position:relative;letter-spacing:-0.5px;
}
.section-title::after{
    content:'';display:block;width:48px;height:4px;
    background:linear-gradient(90deg,#1a73e8,#42a5f5);
    margin:14px auto 0;border-radius:2px;
}

/* ============ 特性卡片 ============ */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.feature-card{
    background:#fff;border:1px solid var(--border);border-radius:var(--radius);
    padding:34px 24px;text-align:center;transition:all .3s;
}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:transparent;}
.feature-icon{
    font-size:34px;color:var(--primary);margin-bottom:18px;
    display:inline-block;width:64px;height:64px;line-height:64px;
    background:var(--primary-light);border-radius:16px;
}
.feature-card h3{font-size:17px;margin-bottom:10px;font-weight:700;}
.feature-card p{font-size:14px;color:var(--text-light);}

/* ============ 产品网格 ============ */
.products-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.product-card{
    background:#fff;border:1px solid var(--border);border-radius:var(--radius);
    padding:26px 20px;text-align:center;transition:all .3s;
}
.product-card:hover{border-color:var(--primary);box-shadow:0 8px 24px rgba(26,115,232,.12);transform:translateY(-3px);}
.product-icon{font-size:30px;color:var(--primary);margin-bottom:14px;}
.product-card h3{font-size:16px;margin-bottom:4px;font-weight:700;}
.product-card .symbol{font-size:13px;color:var(--text-mute);margin-bottom:14px;font-family:monospace;}
.product-meta{
    display:flex;justify-content:center;gap:10px;font-size:12px;
    color:var(--text-light);flex-wrap:wrap;
}
.product-meta span{background:var(--bg-gray);padding:3px 10px;border-radius:12px;}

/* ============ 新闻 ============ */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.news-card{
    background:#fff;border:1px solid var(--border);border-radius:var(--radius);
    overflow:hidden;display:block;transition:all .3s;
}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:transparent;}
.news-thumb{
    height:170px;background:linear-gradient(135deg,#e8f0fe,#d2e3fc);
    display:flex;align-items:center;justify-content:center;
    color:var(--primary);font-size:42px;overflow:hidden;
}
.news-thumb img{width:100%;height:100%;object-fit:cover;}
.news-body{padding:20px;}
.news-body h3{
    font-size:16px;font-weight:700;margin-bottom:10px;line-height:1.4;
    display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-body p{font-size:13px;color:var(--text-light);line-height:1.7;margin-bottom:12px;
    display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.news-date{font-size:12px;color:var(--text-mute);}
.news-date i{margin-right:4px;}

/* ============ 用户评价 ============ */
.testimonials{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.testimonial-card{
    background:#fff;border-radius:var(--radius);padding:32px 28px;
    font-size:15px;color:var(--text-light);line-height:1.85;
    border:1px solid var(--border);position:relative;
}
.testimonial-card::before{
    content:'"';position:absolute;top:8px;left:16px;
    font-size:60px;color:var(--primary-light);font-family:Georgia,serif;line-height:1;
}
.testimonial-card p{position:relative;z-index:1;}
.testimonial-card span{display:block;margin-top:16px;font-weight:700;color:var(--primary);font-size:14px;}

/* ============ 产品表格 ============ */
.filter-tabs{
    display:flex;gap:10px;justify-content:center;margin-bottom:32px;flex-wrap:wrap;
}
.filter-tabs a{
    padding:8px 20px;border-radius:20px;font-size:14px;font-weight:600;
    background:#fff;color:var(--text-light);border:1px solid var(--border);
}
.filter-tabs a:hover{border-color:var(--primary);color:var(--primary);}
.filter-tabs a.active{background:var(--primary);color:#fff;border-color:var(--primary);}

.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border);background:#fff;}
.product-table{width:100%;border-collapse:collapse;font-size:14px;min-width:700px;}
.product-table th{
    background:var(--bg-gray);padding:14px 16px;text-align:left;
    font-weight:700;color:#444;font-size:13px;white-space:nowrap;
}
.product-table td{padding:14px 16px;border-top:1px solid var(--border);}
.product-table tr:hover td{background:#fafbff;}
.product-table code{background:var(--bg-gray);padding:2px 8px;border-radius:4px;font-size:12px;color:var(--primary);}

/* ============ 软件下载 ============ */
.download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.download-card{
    background:#fff;border:1px solid var(--border);border-radius:var(--radius);
    padding:34px 24px;text-align:center;transition:all .3s;
}
.download-card:hover{box-shadow:var(--shadow-lg);border-color:transparent;transform:translateY(-4px);}
.download-icon{
    width:76px;height:76px;line-height:76px;border-radius:20px;
    background:linear-gradient(135deg,#1a73e8,#0d47a1);color:#fff;
    font-size:32px;margin:0 auto 20px;
}
.download-card h3{font-size:18px;font-weight:700;margin-bottom:10px;}
.download-card .platform{font-size:13px;color:var(--text-light);margin-bottom:6px;}
.download-card .version{font-size:12px;color:var(--text-mute);margin-bottom:18px;}

/* ============ 联系页 ============ */
.contact-layout{display:grid;grid-template-columns:1fr 1.4fr;gap:40px;}
.contact-info h2,.contact-form h2{
    font-size:22px;font-weight:700;margin-bottom:24px;color:var(--text);
    padding-bottom:12px;border-bottom:2px solid var(--primary-light);
}
.contact-list li{
    display:flex;gap:16px;padding:16px 0;border-bottom:1px solid var(--border);
}
.contact-list li:last-child{border-bottom:none;}
.contact-list i{
    width:44px;height:44px;line-height:44px;text-align:center;flex-shrink:0;
    background:var(--primary-light);color:var(--primary);
    border-radius:12px;font-size:18px;
}
.contact-list strong{display:block;font-size:14px;color:var(--text-mute);font-weight:500;}
.contact-list span,.contact-list a{font-size:15px;color:var(--text);font-weight:600;}
.contact-list a:hover{color:var(--primary);}

.contact-form{
    background:#fff;border:1px solid var(--border);
    border-radius:var(--radius);padding:32px;
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.form-group{margin-bottom:18px;}
.form-group label{
    display:block;font-size:14px;font-weight:600;
    margin-bottom:6px;color:#444;
}
.form-group label em{color:#e74c3c;font-style:normal;}
.form-group input,.form-group textarea{
    width:100%;padding:12px 16px;border:1px solid var(--border);
    border-radius:8px;font-size:14px;font-family:inherit;
    outline:none;transition:all .2s;background:#fafbfc;
}
.form-group input:focus,.form-group textarea:focus{
    border-color:var(--primary);background:#fff;
    box-shadow:0 0 0 3px rgba(26,115,232,.1);
}
.form-group textarea{resize:vertical;min-height:120px;}
.alert{padding:12px 16px;border-radius:8px;font-size:14px;margin-bottom:18px;}
.alert.success{background:#e8f5e9;color:#2e7d32;border:1px solid #c8e6c9;}
.alert.error{background:#ffebee;color:#c62828;border:1px solid #ffcdd2;}

/* ============ 内容文章 ============ */
.content-article{
    font-size:15px;line-height:1.9;color:#333;
}
.content-article img{margin:20px auto;border-radius:var(--radius);}
.content-article h2,.content-article h3{margin:28px 0 14px;font-weight:700;}
.content-article h2{font-size:22px;}
.content-article h3{font-size:18px;}
.content-article p{margin-bottom:16px;}
.content-article ul,.content-article ol{margin:16px 0;padding-left:24px;list-style:disc;}
.content-article ol{list-style:decimal;}
.content-article li{margin-bottom:8px;}
.content-article a{color:var(--primary);text-decoration:underline;}

.about-h2{font-size:22px;font-weight:700;margin:32px 0 14px;color:var(--primary-dark);}
.about-list{margin:18px 0;padding-left:0;}
.about-list li{padding:8px 0;display:flex;align-items:center;gap:10px;font-size:15px;}
.about-list i{color:#2ecc71;}

/* ============ 分页 ============ */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:44px;flex-wrap:wrap;}
.pagination a{
    min-width:38px;height:38px;line-height:38px;padding:0 12px;
    text-align:center;border-radius:8px;font-size:14px;
    background:#fff;border:1px solid var(--border);color:var(--text);
}
.pagination a:hover{border-color:var(--primary);color:var(--primary);}
.pagination a.active{background:var(--primary);color:#fff;border-color:var(--primary);}

/* ============ 页脚 ============ */
.site-footer{
    background:#fff;color:var(--text-light);
    border-top:1px solid var(--border);
    padding:56px 0 0;margin-top:0;
}
.footer-grid{
    display:grid;grid-template-columns:2fr 1fr 1.2fr 1fr;
    gap:40px;max-width:1200px;margin:0 auto;padding:0 20px;
}
.footer-col h4{
    color:var(--text);font-size:16px;font-weight:700;
    margin-bottom:18px;padding-bottom:10px;
    border-bottom:2px solid var(--primary-light);display:inline-block;
}
.footer-col h4 i{color:var(--primary);margin-right:6px;}
.footer-col p{font-size:13px;line-height:1.8;color:var(--text-light);}
.footer-col ul li{margin-bottom:10px;}
.footer-col ul li a,.footer-col ul li{
    font-size:13px;color:var(--text-light);
    display:flex;align-items:center;gap:6px;
}
.footer-col ul li a:hover{color:var(--primary);}
.footer-col ul li i{color:var(--primary);width:14px;text-align:center;}
.footer-bottom{
    margin-top:44px;border-top:1px solid var(--border);
    padding:24px 20px;text-align:center;font-size:13px;color:var(--text-mute);
    background:#fafbfc;
}
.footer-bottom a{color:var(--text-light);margin:0 4px;}
.footer-bottom a:hover{color:var(--primary);}

/* ============ 移动端底部固定栏 ============ */
.mobile-bottom-bar{
    display:none;
    position:fixed;bottom:0;left:0;right:0;
    z-index:9999;background:#fff;
    border-top:1px solid var(--border);
    padding:8px 12px;
    padding-bottom:calc(8px + env(safe-area-inset-bottom,0px));
    box-shadow:0 -4px 16px rgba(0,0,0,.08);
    gap:8px;
}
.mobile-bottom-bar .bottom-btn{
    flex:1;display:flex;align-items:center;justify-content:center;
    padding:12px 0;border-radius:8px;font-size:15px;
    font-weight:600;text-decoration:none;
}
.mobile-bottom-bar .btn-open{
    background:linear-gradient(135deg,#1a73e8,#0d47a1);color:#fff;
    box-shadow:0 4px 12px rgba(26,115,232,.3);
}
.mobile-bottom-bar .btn-admin{
    background:#f0f2f5;color:#333;border:1px solid #ddd;
}

/* ============ 响应式 ============ */
@media (max-width: 992px){
    .features-grid{grid-template-columns:repeat(2,1fr);}
    .products-grid{grid-template-columns:repeat(2,1fr);}
    .news-grid{grid-template-columns:repeat(2,1fr);}
    .testimonials{grid-template-columns:1fr;}
    .download-grid{grid-template-columns:repeat(2,1fr);}
    .footer-grid{grid-template-columns:1fr 1fr;}
    .contact-layout{grid-template-columns:1fr;}
    .hero h1{font-size:34px;}
    .hero-stats{gap:32px;}
    .main-nav li a{padding:8px 10px;font-size:13px;}
}

@media (max-width: 768px){
    body{padding-bottom:72px;}
    .header-inner{height:56px;padding:0 14px;}
    .logo-text{font-size:17px;}
    .logo-img{height:30px;}
    .header-actions{display:none;}
    .mobile-toggle{display:block;}

    .main-nav{
        display:none;position:fixed;
        top:calc(56px + 28px);left:0;right:0;
        background:#fff;z-index:899;
        box-shadow:0 8px 16px rgba(0,0,0,.1);
        max-height:calc(100vh - 90px);overflow-y:auto;
        border-top:1px solid var(--border);
    }
    .main-nav.active{display:block;}
    .main-nav ul{flex-direction:column;padding:8px 0;}
    .main-nav li a{
        padding:14px 20px;border-bottom:1px solid #f0f0f0;
        border-radius:0;font-size:15px;
    }

    .mobile-bottom-bar{display:flex;}

    .hero{padding:60px 20px 55px;}
    .hero h1{font-size:26px;letter-spacing:-0.5px;}
    .hero p{font-size:14px;margin-bottom:26px;}
    .hero-stats{gap:20px;margin-bottom:30px;}
    .hero-stats .num{font-size:22px;}
    .hero-stats .label{font-size:11px;}
    .hero-btns{gap:10px;}
    .hero-btns .btn-lg{padding:12px 22px;font-size:14px;}

    .page-hero{padding:40px 20px;}
    .page-hero h1{font-size:24px;}
    .page-hero p{font-size:13px;}

    .section{padding:44px 0;}
    .section-title{font-size:22px;margin-bottom:30px;}
    .section-title::after{width:40px;height:3px;margin-top:10px;}

    .features-grid{grid-template-columns:1fr 1fr;gap:12px;}
    .feature-card{padding:22px 14px;}
    .feature-icon{width:52px;height:52px;line-height:52px;font-size:24px;border-radius:14px;margin-bottom:12px;}
    .feature-card h3{font-size:15px;}
    .feature-card p{font-size:12px;}

    .products-grid{grid-template-columns:1fr 1fr;gap:12px;}
    .product-card{padding:18px 12px;}
    .product-icon{font-size:24px;}
    .product-card h3{font-size:14px;}
    .product-meta{font-size:11px;}

    .news-grid{grid-template-columns:1fr;gap:16px;}
    .news-thumb{height:140px;}

    .download-grid{grid-template-columns:1fr;gap:16px;}
    .download-card{padding:24px 20px;}

    .contact-form{padding:22px 18px;}
    .form-row{grid-template-columns:1fr;gap:0;}

    .footer-grid{grid-template-columns:1fr;gap:28px;padding:0 20px;}
    .footer-col h4{font-size:15px;}

    .content-article{font-size:14px;}

    .filter-tabs a{padding:6px 14px;font-size:13px;}
}

@media (max-width: 480px){
    .features-grid{grid-template-columns:1fr;}
    .products-grid{grid-template-columns:1fr;}
    .hero h1{font-size:22px;}
    .hero-stats{gap:16px;}
    .hero-stats .num{font-size:19px;}
}