/* ========== 基础 ========== */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#1f6feb;
  --primary-dark:#1558c0;
  --text:#1f2937;
  --text-light:#5b6572;
  --border:#e3e8ef;
  --bg:#f7f9fc;
  --bg-alt:#eef3f9;
  --white:#fff;
  --radius:12px;
  --shadow:0 4px 18px rgba(31,41,55,.06);
}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--white);line-height:1.7;font-size:16px;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1180px,92%);margin:0 auto}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 22px;border-radius:8px;font-size:15px;font-weight:600;border:1.5px solid transparent;cursor:pointer;transition:.2s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-outline{border-color:var(--primary);color:var(--primary);background:transparent}
.btn-outline:hover{background:#eaf2ff}
.btn-lg{padding:14px 32px;font-size:17px}

/* ========== 头部 ========== */
.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;gap:24px;padding:14px 0}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--primary)}
.logo-text{letter-spacing:.5px}
.main-nav{display:flex;align-items:center;gap:22px;margin-left:auto;font-size:15px}
.main-nav>a,.has-sub>a{padding:6px 0;color:var(--text-light);font-weight:500}
.main-nav>a.active,.has-sub>a.active,.main-nav>a:hover{color:var(--primary)}
.has-sub{position:relative}
.sub-nav{
  position:absolute;top:100%;left:50%;transform:translateX(-50%);
  background:#fff;border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow);
  padding:8px 0;min-width:160px;display:none;flex-direction:column;
}
.sub-nav a{padding:9px 18px;font-size:14px;color:var(--text-light)}
.sub-nav a:hover{background:var(--bg);color:var(--primary)}
.has-sub:hover .sub-nav{display:flex}
.header-actions{display:flex;gap:10px}
.menu-toggle{display:none;background:none;border:none;font-size:26px;cursor:pointer;color:var(--text)}
.header-qq{font-size:13px;color:var(--text-light);padding-bottom:8px}

/* ========== Hero / 页面标题 ========== */
.hero{background:linear-gradient(135deg,#eef5ff 0%,#f7f9fc 100%);padding:72px 0}
.hero-inner{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}
.hero h1{font-size:clamp(30px,4vw,46px);line-height:1.3;margin-bottom:18px}
.hero p{color:var(--text-light);font-size:17px;margin-bottom:28px;max-width:560px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;flex-direction:column;gap:18px;background:#fff;border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.hero-stats div{display:flex;align-items:baseline;gap:10px}
.hero-stats strong{font-size:24px;color:var(--primary)}
.hero-stats span{color:var(--text-light);font-size:14px}
.page-hero{background:var(--bg-alt);padding:52px 0;text-align:center}
.page-hero h1{font-size:clamp(26px,3.5vw,38px);margin-bottom:8px}
.page-hero p{color:var(--text-light)}

/* ========== 区块 ========== */
.section{padding:64px 0}
.section-alt{background:var(--bg)}
.section-title{text-align:center;font-size:clamp(24px,3vw,32px);margin-bottom:40px}

/* ========== 卡片网格 ========== */
.feature-grid,.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature-card,.product-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:.2s;display:block}
.feature-card:hover,.product-card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:#cfdcf0}
.feature-icon,.product-card>span{font-size:32px;display:block;margin-bottom:14px}
.feature-card h3,.product-card h3{font-size:18px;margin-bottom:8px}
.feature-card p,.product-card p{font-size:14px;color:var(--text-light)}
.product-grid-lg{grid-template-columns:repeat(3,1fr)}

/* ========== 新闻 ========== */
.news-list{display:flex;flex-direction:column;gap:0}
.news-item{padding:24px 0;border-bottom:1px solid var(--border)}
.news-date{font-size:13px;color:var(--text-light);margin-bottom:6px}
.news-item h3{font-size:18px;margin-bottom:6px}
.news-item h3 a:hover{color:var(--primary)}
.news-item p{font-size:14px;color:var(--text-light)}
.pagination{display:flex;gap:8px;justify-content:center;margin-top:40px}
.pagination a{min-width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:8px;font-size:14px}
.pagination a.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ========== 产品分类 ========== */
.cat-tabs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:36px}
.cat-tabs a{padding:9px 18px;border:1px solid var(--border);border-radius:20px;font-size:14px;color:var(--text-light)}
.cat-tabs a.active,.cat-tabs a:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.cat-intro{color:var(--text-light);margin:10px 0 24px}
.symbol-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.symbol-card{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:16px;font-size:14px;font-weight:600;text-align:center}

/* ========== 内容页 ========== */
.content-block{max-width:860px}
.content-block h2{font-size:22px;margin:36px 0 14px;padding-bottom:10px;border-bottom:1px solid var(--border)}
.content-block h2:first-child{margin-top:0}
.content-block p{color:var(--text-light);margin-bottom:12px}
.value-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:18px 0}
.value-card{background:var(--bg);border-radius:10px;padding:22px}
.value-card h3{font-size:17px;margin-bottom:6px}
.timeline{position:relative;padding-left:22px;border-left:2px solid var(--border)}
.timeline-item{margin-bottom:22px}
.timeline-item strong{display:block;margin-bottom:2px}
.check-list{padding-left:20px;color:var(--text-light);margin:10px 0}
.check-list li{margin-bottom:8px}
.software-download{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.article-title{font-size:clamp(24px,3.5vw,32px);margin-bottom:10px}
.article-meta{color:var(--text-light);font-size:14px;margin-bottom:24px}
.article-cover{margin:20px 0;border-radius:var(--radius);overflow:hidden}
.article-content{font-size:16px;color:var(--text);line-height:1.9}
.article-back{margin-top:30px}
.breadcrumb{font-size:13px;color:var(--text-light);margin-bottom:16px}
.breadcrumb a:hover{color:var(--primary)}
.empty-tip{text-align:center;color:var(--text-light);padding:60px 0}

/* ========== 联系我们 ========== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info h2,.contact-form-wrap h2{font-size:22px;margin-bottom:20px}
.contact-row{display:flex;gap:14px;padding:12px 0;border-bottom:1px solid var(--border)}
.contact-row span{width:60px;color:var(--text-light);flex-shrink:0}
.contact-tip{margin-top:20px;font-size:14px;color:var(--text-light)}
.contact-form-wrap label,.admin-form label{display:block;margin-bottom:16px;font-size:14px;font-weight:500}
.contact-form-wrap input,.contact-form-wrap textarea,.admin-form input,.admin-form textarea,.admin-form select{
  width:100%;margin-top:6px;padding:11px 14px;border:1px solid var(--border);border-radius:8px;font-family:inherit;font-size:15px;background:#fff;
}
.form-msg{margin-top:14px;color:var(--primary);font-size:14px}

/* ========== CTA ========== */
.cta{background:var(--bg-alt);padding:60px 0;text-align:center}
.cta h2{font-size:clamp(24px,3vw,30px);margin-bottom:10px}
.cta p{color:var(--text-light);margin-bottom:24px}

/* ========== 底部 ========== */
.site-footer{background:#fff;border-top:1px solid var(--border);padding:52px 0 0}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:36px;padding-bottom:36px}
.footer-col h4{font-size:16px;margin-bottom:14px}
.footer-col p,.footer-col a{display:block;font-size:14px;color:var(--text-light);margin-bottom:8px}
.footer-col a:hover{color:var(--primary)}
.footer-bottom{border-top:1px solid var(--border);padding:18px 0;font-size:13px;color:var(--text-light)}
.footer-bottom .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* ========== 移动端底部固定栏 ========== */
.mobile-bottom-bar{display:none;position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--border);padding:10px 14px;gap:10px;z-index:200;box-shadow:0 -4px 16px rgba(0,0,0,.06)}
.mobile-bottom-bar .btn{flex:1;padding:11px 0;font-size:15px}

/* ========== 404 ========== */
.error-page{min-height:70vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px 20px}
.error-page h1{font-size:80px;color:var(--primary);line-height:1}
.error-page p{color:var(--text-light);margin:16px 0 28px}
.error-actions{display:flex;gap:12px}

/* ========== 后台 ========== */
.admin-login-body{background:var(--bg);display:flex;align-items:center;justify-content:center;min-height:100vh}
.admin-login-box{background:#fff;padding:40px 36px;border-radius:16px;box-shadow:var(--shadow);width:min(400px,92%)}
.admin-login-box h1{font-size:22px;margin-bottom:24px;text-align:center}
.admin-login-box label{display:block;margin-bottom:16px;font-size:14px;font-weight:500}
.admin-login-box input{width:100%;margin-top:6px;padding:11px 14px;border:1px solid var(--border);border-radius:8px;font-size:15px}
.admin-login-box .btn{width:100%;margin-top:6px}
.captcha-row{display:flex;gap:10px;align-items:center;margin-top:6px}
.captcha-row input{margin-top:0;flex:1}
.captcha-row img{height:40px;border-radius:6px;cursor:pointer;border:1px solid var(--border)}
.error-msg{background:#fff1f0;color:#c0392b;padding:10px 14px;border-radius:8px;font-size:14px;margin-bottom:16px}
.success-msg{background:#eaf7ee;color:#1e7e34;padding:10px 14px;border-radius:8px;font-size:14px;margin-bottom:18px}

.admin-body{background:var(--bg);min-height:100vh}
.admin-layout{display:flex;min-height:100vh}
.admin-sidebar{width:220px;background:#fff;border-right:1px solid var(--border);padding:22px 14px;display:flex;flex-direction:column;gap:4px;flex-shrink:0}
.admin-brand{font-weight:800;font-size:16px;color:var(--primary);padding:0 10px 18px;border-bottom:1px solid var(--border);margin-bottom:10px}
.admin-sidebar a{padding:10px 12px;border-radius:8px;font-size:14px;color:var(--text-light)}
.admin-sidebar a.active,.admin-sidebar a:hover{background:var(--bg-alt);color:var(--primary)}
.admin-sidebar a.logout{margin-top:auto;color:#c0392b}
.admin-main{flex:1;padding:32px;overflow-x:auto}
.admin-main h1{font-size:22px;margin-bottom:24px}
.admin-title-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;gap:14px;flex-wrap:wrap}
.admin-title-row h1{margin-bottom:0}
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:28px}
.stat-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px}
.stat-card strong{display:block;font-size:24px;color:var(--primary);margin-bottom:4px}
.stat-card span{font-size:13px;color:var(--text-light)}
.quick-links{display:flex;gap:12px;flex-wrap:wrap}
.admin-form{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;max-width:800px}
.admin-form fieldset{border:1px solid var(--border);border-radius:10px;padding:18px 20px;margin-bottom:20px}
.admin-form legend{font-weight:700;padding:0 8px;font-size:15px}
.admin-form textarea{resize:vertical;line-height:1.7}
.admin-form .btn{margin-top:8px}
.admin-table-wrap{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow-x:auto}
.admin-table{width:100%;border-collapse:collapse;font-size:14px}
.admin-table th,.admin-table td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--border);white-space:nowrap}
.admin-table th{background:var(--bg);font-weight:600}
.admin-table a{color:var(--primary);margin-right:10px}
.text-danger{color:#c0392b!important}
.tool-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:20px;max-width:800px}
.tool-card h3{font-size:17px;margin-bottom:10px}
.tool-card p{font-size:14px;color:var(--text-light);margin-bottom:14px}
.tool-card code{background:var(--bg);padding:2px 6px;border-radius:4px;font-size:13px}
.muted{font-size:13px;color:var(--text-light)}
.muted a{color:var(--primary)}

/* ========== 响应式 ========== */
@media (max-width:960px){
  .hero-inner{grid-template-columns:1fr}
  .feature-grid,.product-grid,.product-grid-lg{grid-template-columns:repeat(2,1fr)}
  .symbol-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:1fr 1fr}
  .admin-layout{flex-direction:column}
  .admin-sidebar{width:100%;flex-direction:row;flex-wrap:wrap;border-right:none;border-bottom:1px solid var(--border)}
  .admin-sidebar a.logout{margin-top:0}
  .admin-brand{width:100%;border-bottom:none;padding-bottom:8px;margin-bottom:0}
}
@media (max-width:640px){
  body{font-size:15px;padding-bottom:68px}
  .header-inner{flex-wrap:wrap;gap:12px;padding:12px 0}
  .main-nav{
    display:none;width:100%;flex-direction:column;align-items:flex-start;
    gap:0;order:5;border-top:1px solid var(--border);padding-top:10px;
  }
  .main-nav.open{display:flex}
  .main-nav>a,.has-sub{width:100%}
  .has-sub>a{display:block}
  .sub-nav{position:static;transform:none;display:flex;box-shadow:none;border:none;padding:0 0 0 16px}
  .header-actions{display:none}
  .menu-toggle{display:block;margin-left:auto}
  .header-qq{width:100%;padding-bottom:4px}
  .hero{padding:48px 0}
  .section{padding:44px 0}
  .feature-grid,.product-grid,.product-grid-lg,.symbol-grid,.value-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-bottom .container{flex-direction:column;text-align:center}
  .mobile-bottom-bar{display:flex}
  .admin-main{padding:20px 14px}
  .stat-grid{grid-template-columns:1fr}
}