/* ============ 感芯微官网 前台样式 ============ */
:root{
  --brand:#1668d8;           /* LOGO 品牌蓝 */
  --brand-dark:#0f4fa8;
  --brand-light:#eaf1fd;
  --ink:#1f2733;
  --gray:#5b6b7c;
  --line:#e3e9f0;
  --bg:#f7f9fc;
  --green:#19a974;
  --radius:12px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:#fff;line-height:1.7;font-size:16px}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dark)}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ---- 头部 ---- */
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-size:20px;font-weight:700;color:var(--ink)}
.brand-domain{font-size:12px;color:var(--gray)}
.site-nav{display:flex;align-items:center;gap:6px}
.site-nav a{padding:8px 12px;border-radius:8px;color:var(--ink);font-size:15px}
.site-nav a:hover{background:var(--brand-light);color:var(--brand)}
.site-nav a.active{color:var(--brand);font-weight:600}
.site-nav a.nav-cta{background:var(--brand);color:#fff;font-weight:600}
.site-nav a.nav-cta:hover{background:var(--brand-dark);color:#fff}
.nav-toggle{display:none;background:none;border:none;font-size:26px;color:var(--ink);cursor:pointer}

/* ---- 通用区块 ---- */
.section{padding:60px 0}
.section-gray{background:var(--bg)}
.section-title{text-align:center;font-size:30px;font-weight:700;margin-bottom:10px}
.section-sub{text-align:center;color:var(--gray);margin-bottom:36px;font-size:15px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:0 10px 30px rgba(22,104,216,.10)}

/* ---- 首页 Hero ---- */
.hero{position:relative;background:linear-gradient(135deg,rgba(11,63,145,.88) 0%,rgba(22,104,216,.82) 55%,rgba(43,143,224,.80) 100%),var(--banner-img,linear-gradient(135deg,#0b3f91,#2b8fe0)) center/cover no-repeat;color:#fff;padding:90px 0;text-align:center}
.hero h1{font-size:44px;font-weight:800;margin-bottom:18px;letter-spacing:1px}
.hero p{font-size:18px;opacity:.92;max-width:760px;margin:0 auto}
.hero .hero-cta{margin-top:32px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero .btn-white{background:#fff;color:var(--brand);padding:12px 30px;border-radius:999px;font-weight:600}
.hero .btn-ghost{border:1.5px solid rgba(255,255,255,.7);color:#fff;padding:12px 30px;border-radius:999px}

/* ---- 数据条 ---- */
.stats{background:#fff;border-bottom:1px solid var(--line)}
.stats-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:36px 0}
.stat{text-align:center}
.stat b{font-size:32px;color:var(--brand);font-weight:800;display:block}
.stat span{color:var(--gray);font-size:14px}

/* ---- 核心业务卡片（等高+按钮贴底） ---- */
.biz-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.biz-card{display:flex;flex-direction:column;background:linear-gradient(160deg,#0d4a9e,#1668d8);color:#fff;border-radius:var(--radius);padding:28px;min-height:340px}
.biz-card.green{background:linear-gradient(160deg,#0f7a58,#19a974)}
.biz-card .icon{font-size:34px;margin-bottom:12px}
.biz-card h3{font-size:22px;margin-bottom:10px}
.biz-card p{flex:1 1 auto;opacity:.92;font-size:15px;margin-bottom:20px}
.biz-card a{margin-top:auto;align-self:flex-start;background:#fff;color:var(--brand);padding:9px 22px;border-radius:999px;font-weight:600;font-size:14px}

/* ---- 产品卡片 ---- */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.prod-card img{width:100%;height:210px;object-fit:cover}
.prod-body{padding:18px}
.prod-body h3{font-size:18px;margin-bottom:6px}
.prod-body .model{color:var(--brand);font-size:13px;margin-bottom:8px}
.prod-body p{color:var(--gray);font-size:14px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}

/* ---- 解决方案 ---- */
.sol-block{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center;padding:36px 0}
.sol-block.reverse .sol-media{order:2}
.sol-media img{width:100%;height:280px;object-fit:cover;border-radius:var(--radius)}
.sol-thumbs{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.sol-thumbs img{width:84px;height:60px;object-fit:cover;border-radius:8px;cursor:pointer;opacity:.85;transition:opacity .2s}
.sol-thumbs img:hover,.sol-thumbs img.on{opacity:1;outline:2px solid var(--brand)}
.sol-block h3{font-size:26px;margin-bottom:12px}
.sol-block h4{color:var(--brand);font-size:15px;margin:14px 0 6px}
.sol-block ul{list-style:none}
.sol-block ul li{padding-left:18px;position:relative;color:var(--gray);font-size:15px;margin-bottom:4px}
.sol-block ul li::before{content:"✓";position:absolute;left:0;color:var(--brand)}

/* ---- 加盟 ---- */
.franchise-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.franchise-grid .card{padding:22px}
.franchise-grid h3{font-size:18px;margin-bottom:12px;color:var(--brand)}
.franchise-grid li{list-style:none;padding:8px 0 8px 22px;position:relative;color:var(--gray);font-size:15px;border-bottom:1px dashed var(--line)}
.franchise-grid li::before{content:"•";position:absolute;left:6px;color:var(--brand)}
.process{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;margin-top:10px}
.process div{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px 10px;text-align:center;font-size:14px}
.process b{display:block;color:var(--brand);font-size:18px;margin-bottom:4px}

/* ---- 新闻 / 关于 / 联系 ---- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-item{padding:20px}
.news-item .date{color:var(--gray);font-size:13px}
.news-item h3{font-size:17px;margin:8px 0}
.news-item p{color:var(--gray);font-size:14px}
.timeline{border-left:3px solid var(--brand);margin-left:8px;padding-left:24px}
.timeline li{list-style:none;margin-bottom:22px;position:relative}
.timeline li::before{content:"";position:absolute;left:-31px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--brand)}
.timeline b{color:var(--brand);margin-right:10px}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.form-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.form-card label{display:block;font-size:14px;margin:12px 0 6px;color:var(--ink)}
.form-card input,.form-card textarea,.form-card select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit}
.form-card input:focus,.form-card textarea:focus{border-color:var(--brand);outline:none}
.btn{background:var(--brand);color:#fff;border:none;padding:12px 34px;border-radius:999px;font-size:15px;font-weight:600;cursor:pointer;margin-top:16px}
.btn:hover{background:var(--brand-dark)}
.alert{background:#eaf6f0;color:#0f7a58;border-radius:8px;padding:12px 16px;margin-bottom:14px;font-size:14px}

/* ---- Banner ---- */
.page-banner{background:linear-gradient(120deg,rgba(11,63,145,.88),rgba(22,104,216,.82)),var(--banner-img,linear-gradient(120deg,#0b3f91,#1668d8)) center/cover no-repeat;color:#fff;padding:56px 0;text-align:center}
.page-banner h1{font-size:34px;margin-bottom:8px}
.page-banner p{opacity:.92}

/* ---- 分页 ---- */
.pagination{display:flex;gap:8px;justify-content:center;margin-top:32px}
.pagination a,.pagination span{padding:8px 14px;border:1px solid var(--line);border-radius:8px;color:var(--ink)}
.pagination .cur{background:var(--brand);color:#fff;border-color:var(--brand)}

/* ---- 页脚 ---- */
.site-footer{background:#0e1a2b;color:#b8c4d4;margin-top:60px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1.4fr;gap:32px;padding:44px 0}
.footer-brand{font-size:18px;font-weight:700;color:#fff;margin-bottom:12px}
.footer-col a{display:block;color:#b8c4d4;padding:3px 0}
.footer-col a:hover{color:#fff}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:10px}
.footer-col p{margin-bottom:4px;font-size:14px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:16px 0;font-size:13px;text-align:center}
.footer-bottom a{color:#b8c4d4}

/* ---- 返回顶部 ---- */
.back-top{display:none;position:fixed;right:22px;bottom:60px;width:44px;height:44px;border-radius:50%;background:var(--brand);color:#fff;border:none;font-size:20px;cursor:pointer;box-shadow:0 6px 18px rgba(22,104,216,.35);z-index:99}

/* ---- 响应式 ---- */
@media (max-width:960px){
  .biz-grid,.prod-grid,.news-grid,.franchise-grid{grid-template-columns:repeat(2,1fr)}
  .stats-inner{grid-template-columns:repeat(2,1fr)}
  .sol-block,.contact-grid{grid-template-columns:1fr}
  .process{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .hero h1{font-size:32px}
}
@media (max-width:720px){
  .nav-toggle{display:block}
  .site-nav{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:12px;border-bottom:1px solid var(--line)}
  .site-nav.open{display:flex}
  .site-nav a{text-align:center;padding:12px}
  .biz-grid,.prod-grid,.news-grid,.franchise-grid{grid-template-columns:1fr}
  .stats-inner{grid-template-columns:1fr 1fr}
  .hero{padding:64px 0}
  .hero h1{font-size:26px}
  .section{padding:44px 0}
  .process{grid-template-columns:repeat(2,1fr)}
}