:root{--c-main:#0b5bd3;--c-dark:#16213a;--c-light:#eef4ff}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei",sans-serif;color:#333;background:#fff;line-height:1.7}
.wrap{max-width:1200px;margin:0 auto;padding:0 16px}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* header */
.hd{position:sticky;top:0;background:#fff;box-shadow:0 1px 8px rgba(0,0,0,.08);z-index:10}
.hd-in{display:flex;align-items:center;gap:24px;height:64px}
.logo{font-size:20px;font-weight:700;color:var(--c-main,#0b5bd3);flex-shrink:0}
.sub-badge{font-size:13px;font-weight:600;color:var(--c-main,#0b5bd3);white-space:nowrap;flex-shrink:0;letter-spacing:.5px}
.nav{display:flex;gap:4px;flex:1;overflow-x:auto}
.nav a{padding:6px 14px;border-radius:6px;white-space:nowrap;color:#555}
.nav a.on,.nav a:hover{background:var(--c-light,#eef4ff);color:var(--c-main,#0b5bd3)}
.tel{color:#e2543a;font-weight:700;white-space:nowrap}

/* hero（自适应：min-height+上下内边距，文字多了自动撑高，绝不裁切遮挡） */
.hero{position:relative;min-height:420px;overflow:hidden;background:#1a2a4a;display:flex;align-items:center;justify-content:center;padding:56px 16px}
.hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center;opacity:.45}
.hero-txt{position:relative;text-align:center;color:#fff;max-width:900px;margin:0 auto}
.hero-txt h1{font-size:clamp(22px,3.4vw,38px);line-height:1.35;margin-bottom:12px;text-shadow:0 2px 8px rgba(0,0,0,.4);overflow-wrap:break-word}
.hero-txt p{font-size:clamp(14px,1.6vw,17px);opacity:.92;margin-bottom:24px;overflow-wrap:break-word}
.btn{display:inline-block;background:var(--c-main,#0b5bd3);color:#fff;padding:12px 34px;border-radius:30px;font-size:16px}
.btn:hover{background:var(--c-main,#0b5bd3)}
.btn-o{background:transparent;border:1px solid var(--c-main,#0b5bd3);color:var(--c-main,#0b5bd3);margin-top:16px}

/* sections */
.sec{padding:56px 16px}
.sec-t{font-size:26px;text-align:center;margin-bottom:32px;position:relative}
.sec-t::after{content:"";display:block;width:48px;height:3px;background:var(--c-main,#0b5bd3);margin:10px auto 0;border-radius:2px}
.grid{display:grid;gap:20px}
.g4{grid-template-columns:repeat(4,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid #eee;border-radius:10px;padding:20px;transition:.2s}
.card:hover{box-shadow:0 6px 20px rgba(0,0,0,.08);transform:translateY(-2px)}
.adv h3{color:var(--c-main,#0b5bd3);font-size:17px;margin-bottom:8px}
.adv p{font-size:14px;color:#666}
.prod{padding:0;overflow:hidden;display:block}
.prod img,.prod .img-ph{width:100%;height:180px;object-fit:cover}
.prod h3{font-size:16px;padding:12px 16px 4px}
.prod p{font-size:13px;color:#888;padding:0 16px 16px}
.img-ph{width:100%;height:180px;background:#f0f3f8;display:flex;align-items:center;justify-content:center;color:#aab}

/* about */
.about-row{display:flex;gap:40px;align-items:center}
.about-img{flex:1}
.about-img img,.about-img .img-ph{border-radius:10px;width:100%;height:320px;object-fit:cover}
.about-txt{flex:1.2}
.about-txt .sec-t{text-align:left}
.about-txt .sec-t::after{margin:10px 0 0}
.about-txt p{margin-bottom:12px;color:#555}
.fact{list-style:none;margin-top:16px;color:#555}
.summary{color:var(--c-main,#0b5bd3);font-weight:600;margin-bottom:14px}
.more{text-align:center;margin-top:20px}
.more a{color:var(--c-main,#0b5bd3)}

/* faq */
.faq-list{max-width:820px;margin:0 auto}
.faq{border:1px solid #eee;border-radius:8px;margin-bottom:12px;padding:14px 18px;background:#fff}
.faq summary{cursor:pointer;font-weight:600;color:#333}
.faq p{margin-top:10px;color:#666;font-size:14px}

/* contact */
.contact-card p{margin-bottom:10px}

/* 额外板块：行业介绍正文 / 服务流程步骤条 */
.extra-html{max-width:860px;margin:0 auto;color:#555}
.extra-html p{margin-bottom:12px}
.steps{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.step{flex:1;min-width:180px;background:#fff;border:1px solid #eee;border-radius:10px;padding:22px 18px;text-align:center;position:relative}
.step i{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:50%;background:var(--c-main,#0b5bd3);color:#fff;font-style:normal;font-weight:700;font-size:17px;margin-bottom:10px}
.step h3{font-size:16px;margin-bottom:6px}
.step p{font-size:13px;color:#777}

/* placeholder */
.placeholder{padding:100px 16px;text-align:center}
.placeholder h1{margin-bottom:16px}
.placeholder p{color:#777;max-width:720px;margin:0 auto 10px}

/* footer */
.ft{background:var(--c-dark,#16213a);color:#9fb0cc;padding:36px 0;margin-top:20px;font-size:14px}
.ft .wrap>p{margin-bottom:8px}
.flinks{margin-top:14px;line-height:2}
.flinks a{color:#8fa3c8;margin-right:14px;font-size:13px}
.flinks a:hover{color:#fff}

@media (max-width:900px){
  .g4,.g3{grid-template-columns:repeat(2,1fr)}
  .g2{grid-template-columns:1fr}
  .about-row{flex-direction:column}
  .hero{min-height:300px;padding:40px 16px}
  .tel{display:none}
}

/* 全国城市站点分组板块 */
.city-groups{margin-top:16px;border-top:1px solid rgba(255,255,255,.08);padding-top:12px}
.cg-row{display:flex;flex-wrap:wrap;align-items:baseline;margin:4px 0;line-height:2}
.cg-prov{display:inline-block;min-width:52px;font-weight:700;color:#cdd8ee;margin-right:8px;font-size:13px}
.cg-row a{color:#8fa3c8;margin-right:12px;font-size:12px}
.cg-row a:hover{color:#fff}