:root{
  --brand:#123a63;
  --brand-2:#0b2745;
  --accent:#f07b28;
  --accent-2:#ff9a4d;
  --ink:#1c2733;
  --gray:#5b6b7c;
  --line:#e3e9f0;
  --bg:#f5f7fa;
  --white:#fff;
  --ok:#1f9d55;
  --warn:#d98026;
  --danger:#d64545;
  --radius:12px;
  --shadow:0 6px 24px rgba(18,58,99,.08);
  --maxw:1200px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{margin:0;padding:0;list-style:none}
button,input,select,textarea{font-family:inherit;font-size:inherit}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:12px 26px;border-radius:8px;border:1px solid transparent;cursor:pointer;
  font-size:15px;font-weight:600;transition:.2s;background:var(--accent);color:#fff;
}
.btn:hover{background:#e06d1d;transform:translateY(-1px)}
.btn-outline{background:transparent;border-color:rgba(255,255,255,.55);color:#fff}
.btn-outline:hover{background:rgba(255,255,255,.14)}
.btn-ghost{background:transparent;border-color:var(--brand);color:var(--brand)}
.btn-ghost:hover{background:var(--brand);color:#fff}
.btn-lg{padding:15px 40px;font-size:17px}
.btn-block{width:100%}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* ===== header ===== */
.hd{position:sticky;top:0;z-index:60;background:rgba(11,39,69,.96);backdrop-filter:blur(6px);border-bottom:1px solid rgba(255,255,255,.08)}
.hd-in{display:flex;align-items:center;justify-content:space-between;height:66px;gap:16px}
.logo{display:flex;align-items:center;gap:11px;color:#fff}
.logo-mark{
  width:38px;height:38px;border-radius:8px;flex:none;
  background:linear-gradient(140deg,var(--accent),#ffb066);
  display:flex;align-items:center;justify-content:center;font-weight:800;color:#4a2405;font-size:19px;
  font-family:"Songti SC","STSong",serif;
}
.logo-txt b{display:block;font-size:18px;letter-spacing:1.5px;line-height:1.2}
.logo-txt span{display:block;font-size:11px;color:rgba(255,255,255,.6);letter-spacing:2.5px}
.nav{display:flex;gap:4px;align-items:center}
.nav a{padding:8px 15px;border-radius:6px;color:rgba(255,255,255,.85);font-size:15px;transition:.2s}
.nav a:hover{color:#fff;background:rgba(255,255,255,.1)}
.nav a.on{color:#fff;background:rgba(240,123,40,.9)}
.nav .btn{padding:9px 20px;font-size:14px;margin-left:8px}
.burger{display:none;width:42px;height:38px;border:1px solid rgba(255,255,255,.3);border-radius:6px;background:none;color:#fff;font-size:18px;cursor:pointer}
@media(max-width:860px){
  .burger{display:block}
  .nav{display:none;position:absolute;top:66px;left:0;right:0;background:var(--brand-2);
    flex-direction:column;align-items:stretch;padding:10px;border-bottom:1px solid rgba(255,255,255,.1)}
  .nav.open{display:flex}
  .nav a{padding:12px 14px}
  .nav .btn{margin:6px 0 0}
}

/* ===== hero ===== */
.hero{
  position:relative;color:#fff;overflow:hidden;
  background:linear-gradient(135deg,#0b2745 0%,#123a63 55%,#1a4c7d 100%);
}
.hero::after{
  content:"";position:absolute;inset:0;opacity:.16;
  background-image:
    linear-gradient(rgba(255,255,255,.5) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.5) 1px,transparent 1px);
  background-size:46px 46px;
}
.hero-in{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;padding:74px 20px 82px;max-width:var(--maxw);margin:0 auto;align-items:center}
.hero h1{font-size:40px;line-height:1.28;margin:0 0 18px;font-weight:800;letter-spacing:.5px}
.hero h1 em{font-style:normal;color:var(--accent-2)}
.hero p.sub{font-size:16px;color:rgba(255,255,255,.82);margin:0 0 30px;max-width:560px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.hero-tags{display:flex;gap:26px;margin-top:38px;flex-wrap:wrap}
.hero-tags div b{display:block;font-size:26px;color:var(--accent-2);line-height:1.2}
.hero-tags div span{font-size:13px;color:rgba(255,255,255,.65)}
.hero-card{
  background:rgba(255,255,255,.97);color:var(--ink);border-radius:16px;padding:26px;
  box-shadow:0 24px 60px rgba(0,0,0,.3);
}
.hero-card h3{margin:0 0 4px;font-size:19px}
.hero-card .tip{font-size:13px;color:var(--gray);margin:0 0 18px}
.hero-card label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:#33465c}
.hero-card input,.hero-card select,.hero-card textarea{
  width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:7px;margin-bottom:14px;background:#fbfcfe;font-size:14px;
}
.hero-card input:focus,.hero-card select:focus,.hero-card textarea:focus{outline:none;border-color:var(--brand);background:#fff}
@media(max-width:900px){
  .hero-in{grid-template-columns:1fr;padding:46px 20px 52px;gap:32px}
  .hero h1{font-size:29px}
}

/* ===== section ===== */
.sec{padding:64px 0}
.sec-alt{background:#fff}
.sec-hd{text-align:center;max-width:720px;margin:0 auto 40px}
.sec-hd h2{font-size:30px;margin:0 0 12px;position:relative;padding-bottom:14px}
.sec-hd h2::after{content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);width:52px;height:3px;background:var(--accent);border-radius:2px}
.sec-hd p{margin:0;color:var(--gray);font-size:15px}

/* ===== services grid ===== */
.grid-svc{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.svc{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px;
  transition:.25s;position:relative;overflow:hidden;display:flex;flex-direction:column;
}
.svc:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:#c9d8e8}
.svc-ico{
  width:50px;height:50px;border-radius:11px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,#e8f0f8,#d3e2f1);margin-bottom:14px;font-size:24px;
}
.svc h3{margin:0 0 8px;font-size:17px}
.svc p{margin:0 0 14px;font-size:13.5px;color:var(--gray);flex:1}
.svc-meta{display:flex;justify-content:space-between;align-items:center;padding-top:12px;border-top:1px dashed var(--line)}
.svc-price{color:var(--accent);font-weight:700;font-size:15px}
.svc-price small{font-weight:400;color:var(--gray);font-size:12px}
.svc-btn{font-size:13.5px;color:var(--brand);font-weight:600}
.svc:hover .svc-btn{color:var(--accent)}
@media(max-width:1000px){.grid-svc{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.grid-svc{grid-template-columns:1fr}}

/* ===== steps ===== */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:s}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 20px;position:relative}
.step::before{
  counter-increment:s;content:counter(s);
  position:absolute;right:16px;top:10px;font-size:44px;font-weight:800;color:#eef3f8;line-height:1;
}
.step h4{margin:0 0 8px;font-size:16px;position:relative}
.step p{margin:0;font-size:13.5px;color:var(--gray);position:relative}
@media(max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.steps{grid-template-columns:1fr}}

/* ===== why ===== */
.why{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.why div{background:#fff;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:8px;padding:20px}
.why b{display:block;margin-bottom:6px;font-size:15.5px}
.why span{font-size:13.5px;color:var(--gray)}
@media(max-width:900px){.why{grid-template-columns:1fr}}

/* ===== cases ===== */
.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.case{border-radius:var(--radius);overflow:hidden;background:#fff;border:1px solid var(--line)}
.case-img{height:150px;display:flex;align-items:flex-end;padding:16px;color:#fff;font-weight:700;font-size:16px}
.case-body{padding:16px}
.case-body p{margin:0 0 8px;font-size:13.5px;color:var(--gray)}
.case-body .tag{display:inline-block;font-size:12px;padding:3px 10px;border-radius:20px;background:#eef3f8;color:var(--brand);margin-right:6px}
@media(max-width:900px){.cases{grid-template-columns:1fr}}

/* ===== form page ===== */
.form-wrap{display:grid;grid-template-columns:1fr 320px;gap:26px;align-items:start}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.panel h3{margin:0 0 4px;font-size:20px}
.panel .tip{font-size:13px;color:var(--gray);margin:0 0 22px}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.fld{margin-bottom:16px}
.fld label{display:block;font-size:13.5px;font-weight:600;margin-bottom:6px;color:#33465c}
.fld label i{color:var(--danger);font-style:normal;margin-right:3px}
.fld input,.fld select,.fld textarea{
  width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:7px;font-size:14px;background:#fbfcfe;transition:.15s;
}
.fld input:focus,.fld select:focus,.fld textarea:focus{outline:none;border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(18,58,99,.08)}
.fld textarea{min-height:100px;resize:vertical}
.fld .hint{font-size:12px;color:#8b98a8;margin-top:5px}
.fld.err input,.fld.err select,.fld.err textarea{border-color:var(--danger);background:#fff6f6}
.fld .emsg{display:none;font-size:12px;color:var(--danger);margin-top:5px}
.fld.err .emsg{display:block}
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{padding:8px 15px;border:1px solid var(--line);border-radius:22px;font-size:13.5px;cursor:pointer;background:#fbfcfe;transition:.18s;user-select:none}
.chip:hover{border-color:var(--brand)}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.side{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:sticky;top:88px}
.side h4{margin:0 0 12px;font-size:16px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.side ul li{font-size:13.5px;color:var(--gray);padding:8px 0;border-bottom:1px dashed var(--line);display:flex;gap:8px}
.side ul li:last-child{border-bottom:none}
.side ul li b{color:var(--ink);flex:none}
.notice{background:#fff8f0;border:1px solid #ffd9b3;border-radius:8px;padding:14px;font-size:13px;color:#8a5a22;margin-top:16px}
@media(max-width:900px){
  .form-wrap{grid-template-columns:1fr}
  .side{position:static}
  .frow{grid-template-columns:1fr}
}

/* ===== track ===== */
.track-box{max-width:560px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.timeline{margin-top:24px;border-left:2px solid var(--line);padding-left:22px}
.tl{position:relative;padding-bottom:22px}
.tl:last-child{padding-bottom:0}
.tl::before{content:"";position:absolute;left:-29px;top:5px;width:12px;height:12px;border-radius:50%;background:#cfd9e4;border:2px solid #fff;box-shadow:0 0 0 2px #cfd9e4}
.tl.done::before{background:var(--ok);box-shadow:0 0 0 2px var(--ok)}
.tl b{display:block;font-size:14.5px}
.tl span{font-size:13px;color:var(--gray)}
.tl i{font-style:normal;font-size:12px;color:#9aa7b5}

/* ===== contact / about ===== */
.about{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center}
.about p{color:var(--gray);font-size:15px}
.kv{display:grid;grid-template-columns:100px 1fr;gap:10px 14px;font-size:14.5px;margin-top:18px}
.kv dt{color:var(--gray)}
.kv dd{margin:0;color:var(--ink);font-weight:600}
@media(max-width:900px){.about{grid-template-columns:1fr}}

/* ===== footer ===== */
.ft{background:var(--brand-2);color:rgba(255,255,255,.7);padding:44px 0 0;margin-top:0}
.ft-top{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:36px;padding-bottom:30px}
.ft h5{color:#fff;font-size:15px;margin:0 0 14px}
.ft p{font-size:13.5px;margin:0 0 10px}
.ft li{font-size:13.5px;padding:4px 0}
.ft li a:hover{color:var(--accent-2)}
.ft-bot{border-top:1px solid rgba(255,255,255,.12);padding:16px 0;font-size:13px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
.ft-bot a{color:rgba(255,255,255,.7)}
.ft-bot a:hover{color:var(--accent-2)}
@media(max-width:860px){.ft-top{grid-template-columns:1fr;gap:24px}}

/* ===== toast ===== */
.toast{
  position:fixed;left:50%;top:24px;transform:translate(-50%,-140%);z-index:999;
  background:#22303f;color:#fff;padding:12px 24px;border-radius:8px;font-size:14px;
  box-shadow:0 10px 30px rgba(0,0,0,.25);transition:.28s;max-width:88vw;text-align:center;
}
.toast.show{transform:translate(-50%,0)}
.toast.ok{background:var(--ok)}
.toast.err{background:var(--danger)}

/* ===== success ===== */
.ok-box{max-width:640px;margin:40px auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:44px 34px;text-align:center}
.ok-ico{width:70px;height:70px;border-radius:50%;background:#e8f7ee;color:var(--ok);display:flex;align-items:center;justify-content:center;font-size:36px;margin:0 auto 18px}
.ok-no{background:#f5f7fa;border:1px dashed var(--line);border-radius:8px;padding:14px;font-size:19px;font-weight:800;color:var(--brand);letter-spacing:1.5px;margin:18px 0}
.ok-box p{color:var(--gray);font-size:14px}

.page-hd{background:linear-gradient(135deg,#0b2745,#1a4c7d);color:#fff;padding:44px 0 46px}
.page-hd h1{margin:0 0 8px;font-size:29px}
.page-hd p{margin:0;color:rgba(255,255,255,.75);font-size:14.5px}
.breadcrumb{font-size:13px;color:rgba(255,255,255,.6);margin-bottom:10px}
.breadcrumb a:hover{color:#fff}

.empty{text-align:center;padding:50px 20px;color:var(--gray)}
.empty b{display:block;font-size:16px;color:var(--ink);margin-bottom:8px}