:root{
  --ink:#1f2933; --sub:#52606d; --line:#e4e7eb; --muted:#7b8794;
  --brand:#15396b; --brand2:#2563eb; --accent:#f97316; --accent-d:#c2410c;
  --bg:#f6f8fc; --card:#ffffff; --soft:#eef3fb;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:15px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
section{padding:64px 0}
h1,h2,h3{color:var(--brand);line-height:1.3}
h2{font-size:28px;margin-bottom:10px}
h2 .en{display:block;font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:6px}
.lead{color:var(--sub);font-size:16px;max-width:760px}
.section-head{margin-bottom:34px}
.center{text-align:center}

/* ---------- Header / Nav ---------- */
.site-header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 1px 6px rgba(20,40,80,.05)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--brand);font-size:19px;letter-spacing:.5px}
.logo .dot{width:11px;height:11px;border-radius:3px;background:var(--accent)}
.nav-links{display:flex;gap:4px;align-items:center}
.nav-links>a{font-size:14.5px;color:var(--sub);padding:9px 13px;border-radius:8px;font-weight:500;transition:.15s;white-space:nowrap}
.nav-links>a:hover{color:var(--brand);background:var(--soft)}
.nav-links>a.active{color:#fff;background:var(--brand)}
.nav-cta{background:var(--accent)!important;color:#fff!important;font-weight:600}
.nav-cta:hover{background:var(--accent-d)!important}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 11px;font-size:18px;cursor:pointer;color:var(--brand)}

/* ---------- Buttons ---------- */
.btn{display:inline-block;padding:12px 24px;border-radius:10px;font-weight:600;font-size:15px;cursor:pointer;transition:.15s;border:0}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:#0f2a52}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-d)}
.btn-ghost{border:1.5px solid var(--brand);color:var(--brand);background:transparent}
.btn-ghost:hover{background:var(--soft)}

/* ---------- Hero ---------- */
.hero{position:relative;color:#fff;overflow:hidden}
.hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero .mask{position:absolute;inset:0;background:linear-gradient(105deg,rgba(11,26,52,.92),rgba(11,26,52,.55) 60%,rgba(11,26,52,.25))}
.hero .wrap{position:relative;z-index:2;padding:96px 20px 104px}
.hero h1{color:#fff;font-size:42px;line-height:1.2;max-width:760px;margin-bottom:18px}
.hero p{font-size:18px;opacity:.95;max-width:620px;margin-bottom:30px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- Trust bar ---------- */
.trust{background:var(--brand);color:#fff}
.trust .wrap{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;padding-top:34px;padding-bottom:34px}
.trust .item{text-align:center}
.trust .num{font-size:30px;font-weight:800;color:#fff}
.trust .num span{color:var(--accent)}
.trust .lab{font-size:13px;opacity:.85;margin-top:4px}

/* ---------- Cards / Grid ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.18s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(20,40,80,.10)}
.card .ph{height:170px}
.card .body{padding:18px 20px 22px}
.card h3{font-size:18px;margin-bottom:6px}
.card p{font-size:14px;color:var(--sub)}
.tag-row{margin-top:12px}
.tag{display:inline-block;background:#fff3e8;color:var(--accent-d);border:1px solid #fed7aa;border-radius:6px;padding:2px 9px;font-size:12px;margin:3px 5px 0 0}

/* ---------- Real photos (replace .ph blocks) ---------- */
.photo{width:100%;object-fit:cover;display:block;background:#dde3ea}
.gallery .photo{height:180px}
.gallery video{width:100%;height:180px;object-fit:cover;display:block;background:#000;border-radius:12px}
.card .photo{height:170px}
.feature .photo{height:300px}

/* ---------- Placeholder image block ---------- */
.ph{background:repeating-linear-gradient(45deg,#eef1f5,#eef1f5 12px,#e7ecf3 12px,#e7ecf3 24px);
  border:2px dashed #c2ccd9;display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:#6b7785;text-align:center;padding:14px;font-size:13px;font-weight:600;letter-spacing:.3px}
.ph .ico{font-size:26px;margin-bottom:6px;opacity:.6}
.ph small{font-weight:400;font-size:11.5px;color:#8a96a3;margin-top:4px;max-width:90%}
.ph.sm{height:130px}
.ph.lg{height:240px}

/* ---------- Two column feature ---------- */
.feature{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.feature .ph{height:300px}
.feature h2{margin-bottom:14px}
.feature ul{margin:14px 0 0;padding-left:18px}
.feature li{margin:8px 0;color:var(--sub)}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px}
table{width:100%;border-collapse:collapse;font-size:14px;min-width:560px}
th,td{border-bottom:1px solid var(--line);padding:12px 14px;text-align:left;vertical-align:top}
th{background:var(--soft);color:var(--brand);font-weight:700}
tbody tr:hover{background:#fafcff}
td b{color:var(--ink)}

/* ---------- Stat / app icons ---------- */
.apps{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;text-align:center}
.apps .a{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px 12px}
.apps .ico{font-size:30px}
.apps .t{font-size:13.5px;color:var(--sub);margin-top:8px;font-weight:600}

/* ---------- Quality / gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gallery .ph{height:180px}

/* ---------- Blog ---------- */
.post{display:grid;grid-template-columns:200px 1fr;gap:20px;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-bottom:18px}
.post .ph{height:100%;min-height:140px}
.post .photo{width:100%;height:100%;min-height:140px;object-fit:cover;display:block}
.post .body{padding:18px 20px}
.post h3{font-size:18px;margin-bottom:6px}
.post .meta{font-size:12.5px;color:var(--muted);margin-bottom:8px}
.post p{font-size:14px;color:var(--sub)}

/* ---------- Forms ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1/-1}
label{font-size:13.5px;font-weight:600;color:var(--ink)}
input,select,textarea{font-family:inherit;font-size:14.5px;padding:11px 13px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand2);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.contact-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px;box-shadow:0 8px 24px rgba(20,40,80,.06)}

/* ---------- Footer ---------- */
.site-footer{background:#0f243f;color:#cdd9e8;padding:48px 0 28px;margin-top:20px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.site-footer a{color:#aebfd4;font-size:14px;display:block;margin:7px 0}
.site-footer a:hover{color:#fff}
.foot-bottom{border-top:1px solid #1d3css;border-top:1px solid #213a5c;margin-top:30px;padding-top:18px;font-size:13px;color:#8aa0bd;text-align:center}

/* ---------- WhatsApp float ---------- */
.wa-float{position:fixed;right:22px;bottom:22px;z-index:60;background:#25d366;color:#fff;display:flex;align-items:center;gap:9px;
  padding:13px 18px;border-radius:50px;font-weight:700;box-shadow:0 8px 22px rgba(37,211,102,.4);font-size:15px}
.wa-float:hover{background:#1ebe5b}
.wa-float .ic{font-size:20px}

/* ---------- Breadcrumb / page hero ---------- */
.page-hero{background:linear-gradient(120deg,var(--brand),var(--brand2));color:#fff;padding:54px 0}
.page-hero h1{color:#fff;font-size:34px;margin-bottom:8px}
.page-hero p{opacity:.92;max-width:680px}

/* ---------- Responsive ---------- */
@media(max-width:980px){
  .grid-3,.apps{grid-template-columns:repeat(2,1fr)}
  .trust .wrap{grid-template-columns:repeat(3,1fr)}
  .feature{grid-template-columns:1fr;gap:24px}
  .gallery{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:760px){
  .nav-links{position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;
    padding:10px 16px 18px;border-bottom:1px solid var(--line);display:none;box-shadow:0 10px 20px rgba(0,0,0,.08)}
  .nav-links.open{display:flex}
  .nav-links>a{padding:12px 8px}
  .menu-btn{display:block}
  .hero .wrap{padding:70px 20px 76px}
  .hero h1{font-size:30px}
  .grid-3,.grid-2,.apps,.gallery,.form-grid,.post{grid-template-columns:1fr}
  .post{grid-template-columns:1fr}
  .post .ph{height:160px}
  .post .photo{height:160px}
  .trust .wrap{grid-template-columns:repeat(2,1fr)}
  section{padding:44px 0}
}

/* 图片灯箱 lightbox */
.lightbox{position:fixed;inset:0;z-index:9999;display:none;align-items:center;justify-content:center;
  background:rgba(8,13,22,.92);padding:24px;cursor:zoom-out}
.lightbox.open{display:flex;animation:lbFade .18s ease}
@keyframes lbFade{from{opacity:0}to{opacity:1}}
.lightbox .lb-img{max-width:92vw;max-height:82vh;object-fit:contain;border-radius:8px;
  box-shadow:0 12px 40px rgba(0,0,0,.5);cursor:default;background:#fff}
.lightbox .lb-cap{position:absolute;bottom:18px;left:0;right:0;text-align:center;color:#dfe7f2;
  font-size:14px;padding:0 20px}
.lightbox .lb-close,.lightbox .lb-prev,.lightbox .lb-next{position:absolute;background:rgba(255,255,255,.12);
  color:#fff;border:none;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;
  transition:background .15s}
.lightbox .lb-close{top:16px;right:16px;width:42px;height:42px;font-size:26px}
.lightbox .lb-prev,.lightbox .lb-next{top:50%;transform:translateY(-50%);width:46px;height:46px;font-size:22px}
.lightbox .lb-prev{left:16px}
.lightbox .lb-next{right:16px}
.lightbox .lb-close:hover,.lightbox .lb-prev:hover,.lightbox .lb-next:hover{background:rgba(255,255,255,.28)}