:root{
  --ink:#101820; --ink-2:#3d4b5a; --ink-3:#6b7a8c;
  --brand:#0f3f66; --brand-2:#12507e; --accent:#d9560f;
  --line:#dfe4ea; --bg:#ffffff; --bg-2:#f5f7f9;
  --max:1080px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",
       "Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
a{color:var(--brand-2);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);backdrop-filter:saturate(1.4) blur(6px)}
.hd{display:flex;align-items:center;gap:18px;min-height:64px}
.brand{font-weight:700;font-size:19px;color:var(--brand);letter-spacing:.5px;
  display:flex;align-items:baseline;gap:8px;text-decoration:none}
.brand small{font-size:12px;font-weight:400;color:var(--ink-3);letter-spacing:0}
.nav{margin-left:auto;display:flex;gap:20px;flex-wrap:wrap}
.nav a{color:var(--ink-2);font-size:15px;text-decoration:none;white-space:nowrap}
.nav a:hover{color:var(--brand-2)}
.tel{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:6px;
  background:var(--brand);color:#fff;font-weight:600;font-size:15px;white-space:nowrap;
  text-decoration:none}
.tel:hover{background:var(--brand-2);text-decoration:none}

/* hero（深色实景图底 + 渐变遮罩，白字可读） */
.hero{position:relative;color:#fff;padding:100px 0 80px;background:#081f33;overflow:hidden}
.hero-bg{position:absolute;inset:0;
  background:url('../img/hero_city_wide.webp') center/cover no-repeat;transform:scale(1.02)}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(100deg,rgba(6,19,32,.92) 0%,rgba(6,19,32,.72) 40%,
             rgba(6,19,32,.30) 78%,rgba(6,19,32,.22) 100%)}
.hero .wrap{position:relative;z-index:2}
.hero h1{margin:0 0 14px;font-size:36px;line-height:1.32;font-weight:700;letter-spacing:.3px;
  text-shadow:0 2px 18px rgba(4,14,24,.55)}
.hero p{margin:0;max-width:700px;color:#dbe8f2;font-size:16.5px}
.hero .cta{margin-top:26px;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 22px;border-radius:8px;font-weight:600;
  text-decoration:none;font-size:15px;transition:transform .15s,box-shadow .15s,background .15s}
.btn-p{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(217,86,15,.32)}
.btn-p:hover{background:#e5631c;text-decoration:none;transform:translateY(-1px)}
.btn-g{border:1px solid rgba(255,255,255,.5);color:#fff;background:rgba(255,255,255,.08);
  backdrop-filter:blur(6px)}
.btn-g:hover{background:rgba(255,255,255,.16);text-decoration:none}

/* 子页横幅（每个业务页一张主题图，素材名做 class，url 统一在 CSS 内解析） */
.page-hero{position:relative;color:#fff;background:#0a2540;overflow:hidden;padding:64px 0 54px}
.page-hero .ph-bg{position:absolute;inset:0;
  background-position:center;background-size:cover;transform:scale(1.02)}
.ph-hero_city{background-image:url('../img/hero_city_wide.webp')}
.ph-srv_anfang{background-image:url('../img/srv_anfang_wide.webp')}
.ph-srv_menjin{background-image:url('../img/srv_menjin_wide.webp')}
.ph-srv_chepai{background-image:url('../img/srv_chepai_wide.webp')}
.ph-srv_jifang{background-image:url('../img/srv_jifang_wide.webp')}
.ph-srv_zhihui{background-image:url('../img/srv_zhihui_wide.webp')}
.page-hero::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(96deg,rgba(6,19,32,.90) 0%,rgba(6,19,32,.62) 45%,
             rgba(6,19,32,.28) 100%)}
.page-hero .wrap{position:relative;z-index:2}
.page-hero h1{margin:0 0 10px;font-size:30px;line-height:1.35;font-weight:700;
  text-shadow:0 2px 14px rgba(4,14,24,.5)}
.page-hero p{margin:0;max-width:720px;color:#d5e4ef;font-size:16px}

/* stats（压在 hero 图上的玻璃条） */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  border:1px solid rgba(255,255,255,.4);border-radius:12px;overflow:hidden;margin:-34px 0 0;
  position:relative;z-index:5;box-shadow:0 14px 40px rgba(8,24,40,.16)}
.stat{background:rgba(255,255,255,.92);backdrop-filter:blur(10px);padding:24px 18px;text-align:center}
.stat b{display:block;font-size:30px;line-height:1.1;color:var(--brand);font-weight:700}
.stat span{display:block;margin-top:6px;font-size:13px;color:var(--ink-3)}

/* section（alt 区加青色微光，避免死白） */
section{padding:52px 0;position:relative}
section.alt{background:linear-gradient(180deg,#f5f7f9 0%,#edf1f6 100%)}
section.alt::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(620px 300px at 88% 0%,rgba(51,197,243,.08),transparent 70%),
             radial-gradient(480px 260px at 0% 100%,rgba(15,63,102,.05),transparent 70%)}
section .wrap{position:relative;z-index:1}
h2{font-size:24px;line-height:1.4;margin:0 0 8px;letter-spacing:.3px}
h2+h3{margin-top:0}
.sec-sub{color:var(--ink-3);margin:0 0 28px;font-size:15px}
h3{font-size:18px;margin:34px 0 8px}
h4{font-size:16px;margin:22px 0 6px}
p{margin:0 0 14px}
ul{margin:0 0 16px;padding-left:20px}
li{margin:0 0 8px}
.muted{color:var(--ink-3);font-size:14px}

/* cards（玻璃质感 + 封面图 + 悬停光效） */
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{border:1px solid var(--line);border-radius:12px;padding:22px;background:rgba(255,255,255,.94);
  transition:border-color .18s,box-shadow .18s,transform .18s;overflow:hidden}
.card:hover{border-color:#9fc6e4;box-shadow:0 12px 32px rgba(15,63,102,.13);transform:translateY(-2px)}
.svc-cover{margin:-22px -22px 16px;aspect-ratio:768/400;overflow:hidden;position:relative;
  background:#0a2540}
.svc-cover img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s ease}
.card:hover .svc-cover img{transform:scale(1.05)}
.svc-cover::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,19,32,0) 52%,rgba(6,19,32,.42) 100%)}
.card h3{margin:0 0 8px;font-size:17px}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{color:var(--brand-2)}
.card p{margin:0;font-size:14.5px;color:var(--ink-2)}
.card .more{display:inline-block;margin-top:12px;font-size:14px;color:var(--brand-2)}
.tag{display:inline-block;padding:2px 8px;border-radius:4px;background:#eef3f8;
  color:var(--brand);font-size:12px;margin:0 6px 6px 0}

/* article body */
.article{max-width:820px}
.article h2{border-left:3px solid var(--accent);padding-left:12px;margin-top:40px}
.article h3{margin-top:26px}
.crumb{font-size:13px;color:var(--ink-3);padding:16px 0 0}
.crumb a{color:var(--ink-3)}

/* faq */
.faq{border-top:1px solid var(--line)}
.qa{padding:20px 0;border-bottom:1px solid var(--line)}
.qa h3{margin:0 0 8px;font-size:16.5px;color:var(--ink)}
.qa p{margin:0;color:var(--ink-2);font-size:15px}

/* process */
.steps{counter-reset:s;display:grid;gap:14px;grid-template-columns:repeat(5,1fr)}
.step{background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px}
.step::before{counter-increment:s;content:counter(s);display:inline-flex;
  width:24px;height:24px;align-items:center;justify-content:center;border-radius:50%;
  background:var(--brand);color:#fff;font-size:13px;font-weight:700;margin-bottom:8px}
.step b{display:block;font-size:15px;margin-bottom:4px}
.step span{font-size:13.5px;color:var(--ink-2)}

/* cta band（深蓝渐变 + 双色微光） */
.band{background:linear-gradient(120deg,#0c3355 0%,#0f3f66 58%,#155077 100%);
  color:#fff;padding:52px 0;position:relative;overflow:hidden}
.band::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(520px 260px at 12% 130%,rgba(51,197,243,.16),transparent 70%),
             radial-gradient(420px 220px at 96% -30%,rgba(217,86,15,.12),transparent 70%)}
.band .wrap{position:relative;z-index:1}
.band h2{color:#fff;margin-bottom:8px}
.band p{color:#cfe0ee;margin:0 0 20px}

/* footer */
footer{background:#0d1a24;color:#9fb0bf;padding:44px 0 28px;font-size:14px}
footer a{color:#cfe0ee}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
footer b{color:#fff;font-size:15px;display:block;margin-bottom:10px}
footer p{margin:0 0 8px}
.copy{border-top:1px solid #1d2c38;margin-top:28px;padding-top:18px;
  color:#6f8494;font-size:12.5px}

/* responsive */
@media(max-width:860px){
  .hero{padding:64px 0 52px}
  .hero h1{font-size:27px}
  .page-hero{padding:44px 0 38px}
  .page-hero h1{font-size:24px}
  .stats{grid-template-columns:repeat(2,1fr);margin-top:-24px}
  .g3,.g2{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .fgrid{grid-template-columns:1fr;gap:22px}
  .nav{gap:14px;font-size:14px}
  .hd{flex-wrap:wrap;padding:10px 0;gap:10px}
  .nav{margin-left:0;order:3;width:100%}
  .tel{margin-left:auto}
  section{padding:38px 0}
}