:root{
  --bg:#f5f7fb;
  --bg-card:#ffffff;
  --bg-nav:rgba(255,255,255,.78);
  --bg-footer:#111c2e;
  --text-main:#17202a;
  --text-body:#1f2937;
  --text-sub:#334155;
  --text-muted:#475569;
  --text-light:#64748b;
  --text-footer:#e2e8f0;
  --text-footer-sub:#cbd5e1;
  --brand:#1a2a4a;
  --brand-deep:#0f1b30;
  --brand-light:#2d4a7a;
  --accent:#b45309;
  --accent-light:#d97706;
  --border:#d1d9e6;
  --glass:rgba(255,255,255,.72);
  --glass-border:rgba(255,255,255,.55);
  --shadow:0 2px 12px rgba(15,27,48,.08);
  --shadow-hover:0 10px 34px rgba(15,27,48,.16);
  --radius:14px;
  --radius-sm:10px;
  --max-w:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC",system-ui,sans-serif;
  background:var(--bg);
  background-image:
    radial-gradient(1200px 600px at 8% -10%,rgba(45,74,122,.10),transparent 60%),
    radial-gradient(900px 520px at 100% 0%,rgba(180,83,9,.10),transparent 55%);
  background-attachment:fixed;
  color:var(--text-body);
  line-height:1.85;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
a{color:var(--brand-light);text-decoration:none;transition:color .22s ease,opacity .22s ease}
a:hover{color:var(--accent)}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
img,svg{max-width:100%;display:block}
ul,ol{list-style:none}
.wrap{max-width:var(--max-w);margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;z-index:9999;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* ============ 顶部导航（毛玻璃） ============ */
.topbar{
  position:sticky;top:0;z-index:1000;
  background:var(--bg-nav);
  -webkit-backdrop-filter:blur(16px) saturate(180%);
  backdrop-filter:blur(16px) saturate(180%);
  border-bottom:1px solid var(--border);
  box-shadow:0 1px 6px rgba(15,27,48,.06);
  transition:background .35s ease,border-color .35s ease,box-shadow .35s ease;
}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:66px;gap:16px;
}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0;transition:transform .25s ease}
.logo:hover{transform:translateY(-1px)}
.logo-mark{width:38px;height:38px;flex-shrink:0;border-radius:10px;box-shadow:0 4px 14px rgba(15,27,48,.22)}
.logo-text{font-size:20px;font-weight:800;color:var(--brand);letter-spacing:.5px;white-space:nowrap}
.logo-text span{color:var(--accent)}
.nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.nav a{
  padding:8px 13px;border-radius:9px;font-size:15px;
  color:var(--text-sub);font-weight:500;white-space:nowrap;
  position:relative;transition:background .22s ease,color .22s ease,transform .22s ease;
}
.nav a::after{
  content:"";position:absolute;left:13px;right:13px;bottom:4px;height:2px;
  background:var(--accent);border-radius:2px;transform:scaleX(0);transform-origin:left;
  transition:transform .28s ease;
}
.nav a:hover,.nav a:focus{background:#eef2f9;color:var(--brand);outline:none;transform:translateY(-1px)}
.nav a:hover::after,.nav a:focus::after{transform:scaleX(1)}
.search-box{position:relative;display:flex;align-items:center}
.search-box input{
  width:150px;padding:8px 34px 8px 12px;border:1px solid var(--border);
  border-radius:20px;font-size:14px;background:rgba(249,250,252,.9);color:var(--text-main);
  transition:width .32s ease,border-color .22s ease,background .32s ease,box-shadow .32s ease;
  font-family:inherit;
}
.search-box input::placeholder{color:var(--text-light)}
.search-box input:focus{width:200px;outline:none;border-color:var(--brand-light);background:#fff;box-shadow:0 0 0 4px rgba(45,74,122,.12)}
.search-box button{
  position:absolute;right:6px;background:none;border:none;cursor:pointer;
  color:var(--text-sub);padding:4px;display:flex;align-items:center;
  transition:color .2s ease,transform .2s ease;
}
.search-box button:hover{color:var(--accent);transform:scale(1.1)}
.theme-toggle{
  background:rgba(255,255,255,.6);border:1px solid var(--border);border-radius:50%;
  width:38px;height:38px;display:flex;align-items:center;justify-content:center;
  cursor:pointer;color:var(--text-sub);flex-shrink:0;
  transition:all .25s ease;
}
.theme-toggle:hover{border-color:var(--brand-light);color:var(--brand);background:#eef2f9;transform:rotate(20deg)}
.menu-btn{
  display:none;background:none;border:1px solid var(--border);border-radius:9px;
  width:40px;height:40px;align-items:center;justify-content:center;cursor:pointer;
  color:var(--text-sub);flex-shrink:0;transition:all .22s ease;
}
.menu-btn:hover{color:var(--brand);border-color:var(--brand-light);background:#eef2f9}

/* ============ 面包屑 ============ */
.breadcrumb{
  padding:12px 0;font-size:14px;color:var(--text-muted);
  border-bottom:1px solid var(--border);
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.breadcrumb a{color:var(--brand-light)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .sep{margin:0 8px;color:var(--text-light)}
.breadcrumb .current{color:var(--text-main);font-weight:600}

/* ============ Banner 轮播 ============ */
.banner{
  position:relative;overflow:hidden;border-radius:var(--radius);
  margin:24px 0;box-shadow:var(--shadow);background:var(--brand-deep);
  isolation:isolate;
}
.banner::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(90deg,rgba(15,27,48,.72) 0%,rgba(15,27,48,.35) 55%,rgba(15,27,48,.05) 100%);
}
.banner-track{display:flex;transition:transform .65s cubic-bezier(.65,.05,.36,1)}
.banner-slide{min-width:100%;position:relative;display:flex;align-items:center;min-height:340px}
.banner-slide svg{width:100%;height:100%;position:absolute;inset:0;object-fit:cover}
.banner-content{
  position:relative;z-index:2;padding:48px 40px;max-width:620px;
  animation:bannerIn .8s ease both;
}
@keyframes bannerIn{
  from{opacity:0;transform:translateY(18px)}
  to{opacity:1;transform:translateY(0)}
}
.banner-content h2{
  font-size:30px;color:#ffffff;font-weight:800;margin-bottom:14px;
  text-shadow:0 2px 12px rgba(0,0,0,.6);line-height:1.35;letter-spacing:.5px;
}
.banner-content p{
  font-size:16px;color:#f1f5f9;margin-bottom:20px;
  text-shadow:0 1px 8px rgba(0,0,0,.6);
}
.banner-btn{
  display:inline-block;padding:11px 26px;
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent-light) 100%);
  color:#ffffff;border-radius:26px;font-weight:700;font-size:15px;
  box-shadow:0 6px 20px rgba(180,83,9,.42);
  transition:transform .25s ease,box-shadow .25s ease,filter .25s ease;
}
.banner-btn:hover{color:#ffffff;transform:translateY(-3px);box-shadow:0 12px 30px rgba(180,83,9,.55);filter:brightness(1.06)}
.banner-dots{
  position:absolute;bottom:16px;left:50%;transform:translateX(-50%);
  display:flex;gap:9px;z-index:3;
}
.banner-dots button{
  width:10px;height:10px;border-radius:50%;border:none;cursor:pointer;
  background:rgba(255,255,255,.45);transition:all .32s ease;
}
.banner-dots button:hover{background:rgba(255,255,255,.8)}
.banner-dots button.active{background:#ffffff;width:26px;border-radius:5px}

/* ============ 首屏引导 ============ */
.hero-intro{
  position:relative;overflow:hidden;
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  backdrop-filter:blur(14px) saturate(160%);
  border:1px solid var(--glass-border);
  border-radius:var(--radius);padding:30px 32px;
  margin:24px 0;box-shadow:var(--shadow);border-left:5px solid var(--accent);
  transition:box-shadow .3s ease,transform .3s ease;
}
.hero-intro:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.hero-intro h1{
  font-size:28px;color:var(--brand);font-weight:800;line-height:1.4;
  margin-bottom:14px;
}
.hero-intro h1 em{
  font-style:normal;color:var(--accent);
  background:linear-gradient(135deg,var(--accent),var(--accent-light));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.hero-intro .lead{font-size:16px;color:var(--text-body);line-height:1.9}
.hero-intro .lead strong{color:var(--brand);font-weight:700}

/* ============ 通用区块 ============ */
.section{margin:40px 0}
.section-head{margin-bottom:22px}
.section-head h2{
  font-size:24px;color:var(--brand);font-weight:800;
  padding-left:14px;border-left:5px solid var(--accent);
  line-height:1.4;position:relative;
}
.section-head h2::after{
  content:"";position:absolute;left:14px;bottom:-4px;width:44px;height:3px;
  border-radius:3px;background:linear-gradient(90deg,var(--accent),transparent);
}
.section-head .sub{font-size:15px;color:var(--text-muted);margin-top:8px;padding-left:19px}

.card{
  background:var(--bg-card);border-radius:var(--radius);
  padding:24px 26px;box-shadow:var(--shadow);
  border:1px solid rgba(209,217,230,.7);
  transition:box-shadow .3s ease,transform .3s ease,border-color .3s ease;
}
.card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px);border-color:rgba(45,74,122,.35)}
.card h3{font-size:18px;color:var(--brand);font-weight:700;margin-bottom:10px}
.card h4{font-size:16px;color:var(--text-sub);font-weight:700;margin-bottom:8px}
.card p{color:var(--text-body);font-size:15px;line-height:1.85}
.card p+p{margin-top:10px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}

/* ============ 品牌介绍 ============ */
.brand-intro{
  display:grid;grid-template-columns:1.2fr 1fr;gap:28px;align-items:center;
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  backdrop-filter:blur(14px) saturate(160%);
  border:1px solid var(--glass-border);
  border-radius:var(--radius);padding:30px;
  box-shadow:var(--shadow);
  transition:box-shadow .3s ease;
}
.brand-intro:hover{box-shadow:var(--shadow-hover)}
.brand-intro h2{font-size:22px;color:var(--brand);margin-bottom:14px;font-weight:800}
.brand-intro p{color:var(--text-body);font-size:15px;margin-bottom:12px;line-height:1.9}
.brand-intro p strong{color:var(--brand);font-weight:700}
.brand-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.stat-item{
  background:linear-gradient(135deg,rgba(238,242,249,.95),rgba(255,255,255,.85));
  border-radius:var(--radius-sm);padding:20px 16px;text-align:center;
  border:1px solid var(--border);
  transition:transform .3s ease,box-shadow .3s ease;
}
.stat-item:hover{transform:translateY(-4px);box-shadow:0 10px 24px rgba(15,27,48,.12)}
.stat-num{font-size:28px;font-weight:800;color:var(--accent);line-height:1.2;letter-spacing:-.5px}
.stat-label{font-size:14px;color:var(--text-sub);margin-top:6px}

/* ============ 产品优势 ============ */
.feature-list{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-item{
  position:relative;overflow:hidden;
  background:var(--bg-card);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow);border-top:4px solid var(--brand-light);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.feature-item::before{
  content:"";position:absolute;top:0;right:0;width:110px;height:110px;
  background:radial-gradient(circle at top right,rgba(180,83,9,.14),transparent 70%);
  opacity:0;transition:opacity .35s ease;
}
.feature-item:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-top-color:var(--accent)}
.feature-item:hover::before{opacity:1}
.feature-item h3{font-size:17px;color:var(--brand);margin-bottom:10px;font-weight:700;position:relative}
.feature-item p{font-size:15px;color:var(--text-body);line-height:1.8;position:relative}

/* ============ 解决方案 ============ */
.solution-row{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.solution-card{
  background:var(--bg-card);border-radius:var(--radius);padding:26px;
  box-shadow:var(--shadow);position:relative;overflow:hidden;
  border:1px solid rgba(209,217,230,.7);
  transition:transform .3s ease,box-shadow .3s ease;
}
.solution-card::before{
  content:"";position:absolute;top:0;left:0;width:4px;height:100%;
  background:linear-gradient(180deg,var(--accent),var(--accent-light));
  transition:width .3s ease;
}
.solution-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.solution-card:hover::before{width:6px}
.solution-card h3{font-size:17px;color:var(--brand);margin-bottom:10px;font-weight:700}
.solution-card p{font-size:15px;color:var(--text-body);line-height:1.85}

/* ============ 行业应用 ============ */
.app-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.app-tag{
  background:linear-gradient(135deg,rgba(238,242,249,.95),rgba(255,255,255,.8));
  color:var(--brand);border:1px solid var(--border);
  padding:7px 16px;border-radius:20px;font-size:14px;font-weight:600;
  transition:transform .25s ease,background .25s ease,color .25s ease,border-color .25s ease;
  cursor:default;
}
.app-tag:hover{
  transform:translateY(-2px);
  background:linear-gradient(135deg,var(--brand),var(--brand-light));
  color:#fff;border-color:transparent;
}

/* ============ 客户案例 ============ */
.case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.case-card{
  background:var(--bg-card);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow);border-left:4px solid var(--brand-light);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.case-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-left-color:var(--accent)}
.case-card h3{font-size:17px;color:var(--brand);margin-bottom:10px;font-weight:700}
.case-card p{font-size:15px;color:var(--text-body);line-height:1.85}
.case-meta{font-size:13px;color:var(--text-muted);margin-top:12px;padding-top:10px;border-top:1px dashed var(--border)}

/* ============ 客户评价 ============ */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.review-card{
  background:var(--bg-card);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow);position:relative;
  border:1px solid rgba(209,217,230,.7);
  transition:transform .3s ease,box-shadow .3s ease;
}
.review-card::before{
  content:"\201C";position:absolute;top:6px;right:18px;
  font-size:64px;line-height:1;color:rgba(180,83,9,.16);
  font-family:Georgia,serif;
}
.review-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.review-card .quote{font-size:15px;color:var(--text-body);line-height:1.85;font-style:italic;margin-bottom:14px;position:relative}
.review-card .author{font-size:14px;color:var(--brand);font-weight:700}
.review-card .role{font-size:13px;color:var(--text-muted)}
.stars{color:var(--accent);font-size:14px;margin-bottom:8px;letter-spacing:2px}

/* ============ 新闻中心 ============ */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.news-item{
  background:var(--bg-card);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow);position:relative;overflow:hidden;
  border:1px solid rgba(209,217,230,.7);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.news-item::after{
  content:"";position:absolute;left:0;bottom:0;height:3px;width:100%;
  background:linear-gradient(90deg,var(--accent),var(--brand-light),transparent);
  transform:scaleX(0);transform-origin:left;transition:transform .4s ease;
}
.news-item:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover);border-color:rgba(45,74,122,.3)}
.news-item:hover::after{transform:scaleX(1)}
.news-item h3{font-size:17px;color:var(--brand);margin-bottom:8px;font-weight:700;line-height:1.5}
.news-item h3 a{color:var(--brand)}
.news-item h3 a:hover{color:var(--accent)}
.news-item .meta{font-size:13px;color:var(--text-muted);margin-bottom:10px}
.news-item p{font-size:15px;color:var(--text-body);line-height:1.8}
.news-item .read-more{display:inline-block;margin-top:12px;font-size:14px;font-weight:700;color:var(--accent);transition:transform .25s ease}
.news-item .read-more:hover{color:var(--accent-light);transform:translateX(4px)}

/* ============ 技术文章 ============ */
.article-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.article-card{
  background:var(--bg-card);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow);position:relative;overflow:hidden;
  border:1px solid rgba(209,217,230,.7);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.article-card::after{
  content:"";position:absolute;left:0;bottom:0;height:3px;width:100%;
  background:linear-gradient(90deg,var(--brand-light),var(--accent),transparent);
  transform:scaleX(0);transform-origin:left;transition:transform .4s ease;
}
.article-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover);border-color:rgba(45,74,122,.3)}
.article-card:hover::after{transform:scaleX(1)}
.article-card h3{font-size:17px;color:var(--brand);margin-bottom:8px;font-weight:700;line-height:1.5}
.article-card h3 a{color:var(--brand)}
.article-card h3 a:hover{color:var(--accent)}
.article-card .meta{font-size:13px;color:var(--text-muted);margin-bottom:10px}
.article-card p{font-size:15px;color:var(--text-body);line-height:1.8}
.article-card .read-more{display:inline-block;margin-top:12px;font-size:14px;font-weight:700;color:var(--accent);transition:transform .25s ease}
.article-card .read-more:hover{color:var(--accent-light);transform:translateX(4px)}

/* ============ FAQ ============ */
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:var(--bg-card);border-radius:var(--radius);
  box-shadow:var(--shadow);overflow:hidden;
  border:1px solid var(--border);
  transition:box-shadow .3s ease,border-color .3s ease;
}
.faq-item:hover{box-shadow:var(--shadow-hover);border-color:rgba(45,74,122,.3)}
.faq-item.open{border-color:rgba(180,83,9,.4)}
.faq-q{
  width:100%;text-align:left;background:none;border:none;cursor:pointer;
  padding:18px 22px;font-size:16px;font-weight:700;color:var(--brand);
  display:flex;justify-content:space-between;align-items:center;gap:14px;
  font-family:inherit;line-height:1.6;
  transition:background .25s ease;
}
.faq-q:hover{background:rgba(241,245,251,.9)}
.faq-q .icon{
  flex-shrink:0;width:22px;height:22px;border-radius:50%;
  background:#eef2f9;color:var(--brand);
  display:flex;align-items:center;justify-content:center;
  font-size:16px;font-weight:800;
  transition:transform .35s ease,background .35s ease,color .35s ease;
}
.faq-item.open .faq-q .icon{transform:rotate(45deg);background:var(--accent);color:#fff}
.faq-a{max-height:0;overflow:hidden;transition:max-height .38s ease}
.faq-a-inner{padding:0 22px 20px;font-size:15px;color:var(--text-body);line-height:1.9}
.faq-a-inner p+p{margin-top:10px}

/* ============ HowTo ============ */
.howto-steps{counter-reset:step}
.howto-step{
  background:var(--bg-card);border-radius:var(--radius);padding:22px 24px;
  box-shadow:var(--shadow);margin-bottom:14px;position:relative;
  padding-left:64px;border-left:4px solid var(--brand-light);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.howto-step:hover{transform:translateX(4px);box-shadow:var(--shadow-hover);border-left-color:var(--accent)}
.howto-step::before{
  counter-increment:step;content:counter(step);
  position:absolute;left:20px;top:22px;
  width:30px;height:30px;border-radius:50%;
  background:linear-gradient(135deg,var(--brand),var(--brand-light));
  color:#fff;font-weight:800;font-size:15px;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(15,27,48,.25);
}
.howto-step h3{font-size:16px;color:var(--brand);margin-bottom:8px;font-weight:700}
.howto-step p{font-size:15px;color:var(--text-body);line-height:1.85}

/* ============ 联系信息 ============ */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.contact-card{
  background:var(--bg-card);border-radius:var(--radius);padding:24px;
  box-shadow:var(--shadow);border:1px solid rgba(209,217,230,.7);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
}
.contact-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(45,74,122,.3)}
.contact-card h3{font-size:17px;color:var(--brand);margin-bottom:12px;font-weight:700}
.contact-card p{font-size:15px;color:var(--text-body);line-height:1.9}
.contact-card a{color:var(--brand-light);font-weight:600}
.contact-card a:hover{color:var(--accent)}

/* ============ 网站地图 ============ */
.sitemap-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.sitemap-col{
  background:var(--bg-card);border-radius:var(--radius);padding:20px;
  box-shadow:var(--shadow);border:1px solid rgba(209,217,230,.7);
  transition:transform .3s ease,box-shadow .3s ease;
}
.sitemap-col:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.sitemap-col h3{font-size:15px;color:var(--brand);margin-bottom:10px;font-weight:700}
.sitemap-col ul li{margin-bottom:7px}
.sitemap-col ul li a{font-size:14px;color:var(--text-sub);transition:color .2s ease,padding-left .25s ease}
.sitemap-col ul li a:hover{color:var(--accent);padding-left:4px}

/* ============ 友情链接 ============ */
.links-wrap{display:flex;flex-wrap:wrap;gap:10px}
.links-wrap a{
  background:var(--bg-card);border:1px solid var(--border);border-radius:9px;
  padding:8px 16px;font-size:14px;color:var(--text-sub);
  transition:all .25s ease;
}
.links-wrap a:hover{
  border-color:var(--brand-light);color:var(--brand);
  background:#eef2f9;transform:translateY(-2px);
  box-shadow:0 6px 16px rgba(15,27,48,.1);
}

/* ============ Footer ============ */
.footer{
  background:linear-gradient(180deg,var(--bg-footer) 0%,#0a1322 100%);
  color:var(--text-footer);
  margin-top:50px;padding:44px 0 0;
  position:relative;
}
.footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--brand-light),var(--accent),var(--brand-light));
}
.footer-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;
  padding-bottom:30px;border-bottom:1px solid #2a3a55;
}
.footer h3{font-size:16px;color:#ffffff;font-weight:700;margin-bottom:14px}
.footer p,.footer li{font-size:14px;color:var(--text-footer-sub);line-height:1.9}
.footer a{color:var(--text-footer-sub);transition:color .22s ease,padding-left .22s ease}
.footer a:hover{color:#ffffff;padding-left:3px}
.footer ul li{margin-bottom:8px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand .logo-text{color:#ffffff}
.footer-brand .logo-text span{color:var(--accent-light)}
.footer-bottom{
  padding:20px 0;font-size:13px;color:var(--text-footer-sub);
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;
}
.footer-bottom a{color:var(--text-footer-sub)}
.footer-bottom a:hover{color:#ffffff}

/* ============ 返回顶部 ============ */
.back-top{
  position:fixed;right:22px;bottom:22px;z-index:900;
  width:46px;height:46px;border-radius:50%;
  background:linear-gradient(135deg,var(--brand),var(--brand-light));
  color:#fff;border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 6px 20px rgba(15,27,48,.35);
  opacity:0;visibility:hidden;transform:translateY(12px) scale(.9);
  transition:all .35s cubic-bezier(.34,1.56,.64,1);
}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0) scale(1)}
.back-top:hover{background:linear-gradient(135deg,var(--accent),var(--accent-light));transform:translateY(-4px) scale(1.06)}

/* ============ 滚动动画 ============ */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s cubic-bezier(.22,1,.36,1)}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ============ 暗黑模式 ============ */
body.dark{
  --bg:#0b1220;
  --bg-card:#151f33;
  --bg-nav:rgba(17,26,44,.78);
  --bg-footer:#060b14;
  --text-main:#f1f5f9;
  --text-body:#e5e7eb;
  --text-sub:#cbd5e1;
  --text-muted:#94a3b8;
  --text-light:#64748b;
  --text-footer:#e2e8f0;
  --text-footer-sub:#cbd5e1;
  --brand:#93b4e6;
  --brand-deep:#0a1120;
  --brand-light:#7fa8e0;
  --accent:#f59e0b;
  --accent-light:#fbbf24;
  --border:#2a3a55;
  --glass:rgba(21,31,51,.72);
  --glass-border:rgba(42,58,85,.7);
  --shadow:0 2px 12px rgba(0,0,0,.4);
  --shadow-hover:0 12px 36px rgba(0,0,0,.6);
}
body.dark{
  background-image:
    radial-gradient(1200px 600px at 8% -10%,rgba(127,168,224,.10),transparent 60%),
    radial-gradient(900px 520px at 100% 0%,rgba(245,158,11,.10),transparent 55%);
}
body.dark .logo-text{color:#f1f5f9}
body.dark .logo-text span{color:var(--accent-light)}
body.dark .nav a:hover,body.dark .nav a:focus{background:#1e2b45;color:#ffffff}
body.dark .search-box input{background:rgba(15,24,41,.9);color:#e5e7eb;border-color:#2a3a55}
body.dark .search-box input::placeholder{color:#94a3b8}
body.dark .search-box input:focus{background:#0b1220;border-color:var(--brand-light);box-shadow:0 0 0 4px rgba(127,168,224,.14)}
body.dark .search-box button{color:#cbd5e1}
body.dark .theme-toggle{background:rgba(30,43,69,.7);border-color:#2a3a55;color:#cbd5e1}
body.dark .theme-toggle:hover{background:#1e2b45;color:#ffffff}
body.dark .menu-btn{border-color:#2a3a55;color:#cbd5e1}
body.dark .menu-btn:hover{background:#1e2b45;color:#ffffff}
body.dark .breadcrumb{color:#94a3b8}
body.dark .breadcrumb .current{color:#f1f5f9}
body.dark .hero-intro h1{color:#f1f5f9}
body.dark .hero-intro h1 em{color:var(--accent-light)}
body.dark .hero-intro .lead{color:#e5e7eb}
body.dark .hero-intro .lead strong{color:#ffffff}
body.dark .section-head h2{color:#f1f5f9}
body.dark .section-head .sub{color:#94a3b8}
body.dark .card{border-color:rgba(42,58,85,.9)}
body.dark .card h3{color:#f1f5f9}
body.dark .card h4{color:#cbd5e1}
body.dark .card p{color:#e5e7eb}
body.dark .brand-intro h2{color:#f1f5f9}
body.dark .brand-intro p{color:#e5e7eb}
body.dark .brand-intro p strong{color:#ffffff}
body.dark .stat-item{background:linear-gradient(135deg,rgba(30,43,69,.95),rgba(21,31,51,.85));border-color:#2a3a55}
body.dark .stat-num{color:var(--accent-light)}
body.dark .stat-label{color:#cbd5e1}
body.dark .feature-item h3{color:#f1f5f9}
body.dark .feature-item p{color:#e5e7eb}
body.dark .solution-card{border-color:rgba(42,58,85,.9)}
body.dark .solution-card h3{color:#f1f5f9}
body.dark .solution-card p{color:#e5e7eb}
body.dark .app-tag{background:linear-gradient(135deg,rgba(30,43,69,.95),rgba(21,31,51,.85));color:#cbd5e1;border-color:#2a3a55}
body.dark .app-tag:hover{background:linear-gradient(135deg,var(--brand),var(--brand-light));color:#0b1220}
body.dark .case-card h3{color:#f1f5f9}
body.dark .case-card p{color:#e5e7eb}
body.dark .case-meta{color:#94a3b8;border-top-color:#2a3a55}
body.dark .review-card{border-color:rgba(42,58,85,.9)}
body.dark .review-card .quote{color:#e5e7eb}
body.dark .review-card .author{color:#f1f5f9}
body.dark .review-card .role{color:#94a3b8}
body.dark .stars{color:var(--accent-light)}
body.dark .news-item{border-color:rgba(42,58,85,.9)}
body.dark .news-item h3 a{color:#f1f5f9}
body.dark .news-item h3 a:hover{color:var(--accent-light)}
body.dark .news-item p{color:#e5e7eb}
body.dark .news-item .meta{color:#94a3b8}
body.dark .news-item .read-more{color:var(--accent-light)}
body.dark .article-card{border-color:rgba(42,58,85,.9)}
body.dark .article-card h3 a{color:#f1f5f9}
body.dark .article-card h3 a:hover{color:var(--accent-light)}
body.dark .article-card p{color:#e5e7eb}
body.dark .article-card .meta{color:#94a3b8}
body.dark .article-card .read-more{color:var(--accent-light)}
body.dark .faq-item{background:#151f33;border-color:#2a3a55}
body.dark .faq-q{color:#f1f5f9}
body.dark .faq-q:hover{background:#1e2b45}
body.dark .faq-q .icon{background:#1e2b45;color:#cbd5e1}
body.dark .faq-item.open .faq-q .icon{background:var(--accent);color:#0b1220}
body.dark .faq-a-inner{color:#e5e7eb}
body.dark .howto-step h3{color:#f1f5f9}
body.dark .howto-step p{color:#e5e7eb}
body.dark .howto-step::before{background:linear-gradient(135deg,var(--brand),var(--brand-light));color:#0b1220}
body.dark .contact-card{border-color:rgba(42,58,85,.9)}
body.dark .contact-card h3{color:#f1f5f9}
body.dark .contact-card p{color:#e5e7eb}
body.dark .contact-card a{color:var(--brand-light)}
body.dark .contact-card a:hover{color:var(--accent-light)}
body.dark .sitemap-col{border-color:rgba(42,58,85,.9)}
body.dark .sitemap-col h3{color:#f1f5f9}
body.dark .sitemap-col ul li a{color:#cbd5e1}
body.dark .sitemap-col ul li a:hover{color:var(--accent-light)}
body.dark .links-wrap a{background:#151f33;border-color:#2a3a55;color:#cbd5e1}
body.dark .links-wrap a:hover{border-color:var(--brand-light);color:#ffffff;background:#1e2b45}
body.dark .footer{background:linear-gradient(180deg,#060b14 0%,#04080f 100%)}
body.dark .footer::before{background:linear-gradient(90deg,var(--brand-light),var(--accent-light),var(--brand-light))}
body.dark .footer h3{color:#ffffff}
body.dark .footer p,body.dark .footer li{color:#cbd5e1}
body.dark .footer a{color:#cbd5e1}
body.dark .footer a:hover{color:#ffffff}
body.dark .footer-bottom{color:#cbd5e1}
body.dark .back-top{background:linear-gradient(135deg,var(--brand),var(--brand-light));color:#0b1220}
body.dark .back-top:hover{background:linear-gradient(135deg,var(--accent),var(--accent-light));color:#0b1220}
body.dark .banner-content h2{color:#ffffff}
body.dark .banner-content p{color:#f1f5f9}

/* ============ 响应式 ============ */
@media(max-width:1024px){
  .grid-4,.sitemap-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .brand-intro{grid-template-columns:1fr}
  .feature-list{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  body{font-size:15px}
  .nav{
    display:none;position:absolute;top:66px;left:0;right:0;
    background:var(--bg-nav);
    -webkit-backdrop-filter:blur(18px) saturate(180%);
    backdrop-filter:blur(18px) saturate(180%);
    flex-direction:column;align-items:stretch;
    padding:12px 16px;border-bottom:1px solid var(--border);
    box-shadow:0 12px 28px rgba(15,27,48,.16);gap:2px;
  }
  .nav.open{display:flex;animation:navIn .28s ease both}
  @keyframes navIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
  .nav a{padding:12px 14px;font-size:16px}
  .nav a::after{display:none}
  .menu-btn{display:flex}
  .search-box input{width:110px}
  .search-box input:focus{width:150px}
  .banner-slide{min-height:280px}
  .banner-content{padding:32px 24px}
  .banner-content h2{font-size:22px}
  .banner-content p{font-size:15px}
  .hero-intro{padding:24px 20px}
  .hero-intro h1{font-size:22px}
  .section-head h2{font-size:20px}
  .grid-2,.grid-3,.grid-4,.solution-row,.case-grid,.news-grid,.article-grid,
  .contact-grid,.feature-list,.review-grid,.sitemap-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-bottom{flex-direction:column;text-align:center}
  .brand-stats{grid-template-columns:repeat(2,1fr)}
  .back-top{right:14px;bottom:14px;width:42px;height:42px}
  .howto-step{padding-left:58px}
}
@media(max-width:420px){
  .logo-text{font-size:17px}
  .search-box input{width:90px}
  .search-box input:focus{width:120px}
  .brand-stats{grid-template-columns:1fr}
  .banner-content h2{font-size:19px}
  .hero-intro h1{font-size:19px}
}

/* ============ 无障碍 & 动效偏好 ============ */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
}
@media print{
  .topbar,.banner,.back-top,.footer,.breadcrumb{display:none}
  body{background:#fff;color:#000}
}