:root{
  --navy:#0b2a4a;
  --navy-2:#123a63;
  --blue:#1b6ca8;
  --blue-l:#3f8fd0;
  --orange:#e8852c;
  --ink:#1f2a37;
  --muted:#5b6b7c;
  --line:#e3e9f0;
  --bg:#f5f8fb;
  --white:#fff;
  --shadow:0 6px 22px rgba(11,42,74,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC","WenQuanYi Micro Hei",Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;break-inside:avoid;page-break-inside:avoid}
.container{max-width:1120px;margin:0 auto;padding:0 20px}
h1,h2,h3{margin:0;font-weight:700;color:var(--navy)}
p{margin:0 0 14px}

/* ===== 顶部 ===== */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(11,42,74,.96);
  backdrop-filter:blur(8px);
  color:#fff;
  box-shadow:0 2px 14px rgba(0,0,0,.18);
}
.top-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.brand{display:flex;align-items:center;gap:12px}
.logo{
  width:40px;height:40px;border-radius:9px;
  display:inline-flex;align-items:center;justify-content:center;line-height:1;
  background:linear-gradient(135deg,var(--orange),#f0a45a);
  font-size:22px;font-weight:800;color:#fff;
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:17px;letter-spacing:.5px}
.brand-text span{font-size:10.5px;letter-spacing:1.4px;color:#a9c6e2;text-transform:uppercase}
.top-right{display:flex;align-items:center;gap:22px}
.lang-switch{display:flex;background:rgba(255,255,255,.10);border-radius:8px;padding:3px}
.lang-btn{
  border:0;background:transparent;color:#cfe0f0;cursor:pointer;
  font-size:13px;font-weight:700;padding:5px 11px;border-radius:6px;transition:.2s;
}
.lang-btn.active{background:var(--orange);color:#fff}
.lang-btn:hover:not(.active){color:#fff}
.top-nav{display:flex;gap:22px}
.top-nav a{
  color:#dbe8f4;font-size:14.5px;text-decoration:none;position:relative;padding:4px 0;
}
.top-nav a:hover{color:#fff}
.top-nav a:hover::after{content:"";position:absolute;left:0;bottom:-2px;width:100%;height:2px;background:var(--orange);border-radius:2px}

/* ===== 首屏 ===== */
.hero{position:relative;height:560px;display:flex;align-items:center;overflow:hidden;color:#fff}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.hero-overlay{position:absolute;inset:0;z-index:1;background:linear-gradient(105deg,rgba(11,42,74,.86),rgba(27,108,168,.55))}
.hero-content{position:relative;z-index:2;max-width:780px}
.kicker{font-size:12.5px;letter-spacing:3px;color:#ffd9b8;margin-bottom:16px;text-transform:uppercase}
.hero h1{color:#fff;font-size:44px;line-height:1.25;margin-bottom:16px;text-shadow:0 2px 14px rgba(0,0,0,.3)}
.hero-sub{font-size:18px;color:#e8f2fb;margin-bottom:30px;max-width:640px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;line-height:1;
  padding:13px 28px;border-radius:8px;font-size:15px;font-weight:700;text-decoration:none;
  border:2px solid transparent;cursor:pointer;transition:.2s;
}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:#d7761f;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}
.btn-ghost:hover{background:rgba(255,255,255,.14)}
.btn-block{width:100%}

/* ===== 通用区块 ===== */
.section{padding:78px 0}
.section-alt{background:var(--white)}
.sec-head{margin-bottom:38px;text-align:center}
.sec-en{display:block;font-size:12px;letter-spacing:4px;color:var(--orange);font-weight:700;margin-bottom:8px;text-transform:uppercase}
.sec-head h2{font-size:30px}

/* ===== 简介 ===== */
.about-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:46px;align-items:start}
.about-text p{font-size:15.5px;color:var(--muted)}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.stat{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:20px 16px;text-align:center;box-shadow:var(--shadow);transition:.2s}
.stat:hover{transform:translateY(-4px);border-color:var(--blue-l)}
.stat b{display:block;color:var(--navy);font-size:17px;margin-bottom:4px}
.stat span{font-size:12.5px;color:var(--muted)}

/* ===== 服务卡片 ===== */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.svc-card{background:var(--white);border-radius:14px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);transition:.22s}
.svc-card:hover{transform:translateY(-6px);box-shadow:0 14px 32px rgba(11,42,74,.16)}
.svc-card img{width:100%;height:170px;object-fit:cover}
.svc-body{padding:22px}
.svc-body h3{font-size:19px;margin-bottom:10px;color:var(--navy)}
.svc-body p{font-size:14px;color:var(--muted);margin:0}

/* ===== 案例 ===== */
.case-block{background:var(--white);border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:10px;padding:24px 28px;margin-bottom:18px;box-shadow:var(--shadow)}
.case-block h3{font-size:19px;margin-bottom:8px;color:var(--navy)}
.case-block > p{color:var(--muted);font-size:14.5px}
.case-list{margin:6px 0 0;padding-left:20px;color:var(--muted);font-size:14.5px}
.case-list li{margin-bottom:5px}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:26px}
.case-card{background:linear-gradient(160deg,#0b2a4a,#1b6ca8);color:#fff;border-radius:12px;padding:22px;min-height:104px;display:flex;flex-direction:column;justify-content:space-between;transition:.22s}
.case-card:hover{transform:translateY(-5px);background:linear-gradient(160deg,#123a63,#2b7fbd)}
.case-tag{font-size:11px;letter-spacing:2px;color:#ffd9b8;font-weight:700}
.case-card p{margin:0;font-size:14.5px;line-height:1.55}

/* ===== 联系 + 表单 ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:46px;align-items:start}
.info-list{list-style:none;padding:0;margin:0}
.info-list li{display:flex;gap:14px;padding:13px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.info-list span{color:var(--muted);min-width:52px;flex-shrink:0}
.info-list strong{color:var(--ink);font-weight:600;text-align:left}

.feedback{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:28px;box-shadow:var(--shadow)}
.feedback h3{font-size:21px;margin-bottom:4px}
.form-note{font-size:13px;color:var(--muted);margin-bottom:18px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.feedback input,.feedback select,.feedback textarea{
  width:100%;border:1px solid var(--line);border-radius:8px;padding:11px 13px;font-size:14.5px;
  font-family:inherit;color:var(--ink);background:#fbfdff;margin-bottom:12px;transition:.2s;
}
.feedback input:focus,.feedback select:focus,.feedback textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(27,108,168,.13)}
.feedback textarea{resize:vertical;margin-bottom:14px}
.feedback select{appearance:none}
.hp{display:none}
.form-hint{font-size:12px;color:var(--muted);margin:12px 0 0;text-align:center}

/* ===== 页脚 ===== */
.footer{background:var(--navy);color:#bcd1e6;padding:40px 0 30px}
.footer-inner{display:flex;flex-direction:column;align-items:center;text-align:center;gap:12px}
.foot-brand{display:flex;align-items:center;gap:12px}
.foot-brand strong{display:block;color:#fff;font-size:16px}
.foot-brand span{font-size:11px;letter-spacing:1.5px;color:#9dbad6;text-transform:uppercase}
.foot-motto{color:#ffd9b8;font-size:14.5px;margin:0}
.copyright{font-size:12.5px;color:#7f9cbb;margin:0}

/* ===== 响应式 ===== */
@media (max-width:900px){
  .svc-grid,.case-grid{grid-template-columns:repeat(2,1fr)}
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:30px}
  .hero{height:460px}.hero h1{font-size:32px}
}
@media (max-width:620px){
  .top-nav{display:none}
  .top-right{gap:12px}
  .section{padding:54px 0}
  .svc-grid,.case-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
  .hero h1{font-size:26px}.hero-sub{font-size:15.5px}
  .sec-head h2{font-size:24px}
}
@media print{
  .topbar,.lang-switch,.feedback,.hero-actions{display:none}
  .section{padding:24px 0}
}