:root{
  /* 深色系（后台「深色底」可控） */
  --navy:#08152c; --navy2:#0b2450; --navy3:#0a1830; --navy-deep:#050f1f;
  --navy-rgb:8,21,44;
  /* 主色系（后台「主色」可控） */
  --blue:#2f8fff; --blue2:#1e6fd9; --blue-lt:#5cc8ff;
  --blue-rgb:47,143,255;
  /* 页面背景（后台「页面背景色」可控） */
  --bg:#ffffff;
  --ink:#0f1c2e; --muted:#647489; --line:#e4eaf2; --light:#f4f7fc; --white:#fff;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Segoe UI',Roboto,Helvetica,Arial,'Microsoft YaHei',sans-serif;color:var(--ink);background:var(--bg);line-height:1.65}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1240px;margin:0 auto;padding:0 24px}

/* ===== top bar ===== */
.topbar{background:var(--navy-deep);color:#93a9c9;font-size:13px;border-bottom:1px solid rgba(255,255,255,.06)}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:38px}
.topbar .lang a{color:#93a9c9;padding:0 6px}
.topbar .lang a.on{color:#fff;font-weight:700}

/* ===== nav ===== */
header{position:sticky;top:0;z-index:120;background:rgba(var(--navy-rgb),.94);backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.07)}
nav{display:flex;align-items:center;justify-content:space-between;height:78px;color:#fff;gap:20px}
.brand{display:flex;align-items:center;gap:13px;flex-shrink:0}
.brand .mark{width:46px;height:46px;border-radius:50%;background:radial-gradient(circle at 34% 30%,var(--blue-lt),var(--blue) 58%,var(--navy));box-shadow:0 0 22px rgba(var(--blue-rgb),.65)}
.brand b{display:block;font-size:16px;letter-spacing:.4px}
.brand small{display:block;font-size:11px;color:#9fb4d4;font-weight:400;letter-spacing:.3px}
.menu{display:flex;gap:2px;font-size:15px;align-items:center;flex-wrap:nowrap}
.menu a{color:#dbe7f7;padding:10px 13px;border-radius:6px;transition:.18s;white-space:nowrap}
.menu a:hover{background:rgba(var(--blue-rgb),.18)}
.menu a.active{background:var(--blue);color:#fff}
.menu a.cta{background:var(--blue);color:#fff;margin-left:10px}
.hamb{display:none;background:none;border:1px solid rgba(255,255,255,.35);color:#fff;font-size:20px;border-radius:6px;padding:4px 10px;cursor:pointer}

/* ===== hero ===== */
.hero{position:relative;background:linear-gradient(120deg,var(--navy) 0%,var(--navy2) 52%,var(--navy3) 100%);color:#fff;overflow:hidden}
.hero .globe{position:absolute;right:-140px;top:-160px;width:760px;height:760px;border-radius:50%;
  background:radial-gradient(circle at 30% 30%,rgba(var(--blue-rgb),.55),rgba(var(--blue-rgb),.14) 46%,transparent 70%)}
.hero .arc{position:absolute;right:-60px;top:-40px;width:920px;height:920px;border-radius:50%;
  border:2px solid rgba(var(--blue-rgb),.42);box-shadow:0 0 70px rgba(var(--blue-rgb),.5),inset 0 0 90px rgba(var(--blue-rgb),.22)}
.hero .inner{position:relative;z-index:2;display:grid;grid-template-columns:1.12fr .88fr;gap:30px;align-items:center;padding:78px 0 92px}
.hero h1{font-size:clamp(32px,4.6vw,56px);line-height:1.12;font-weight:800;letter-spacing:-.5px}
.hero p{color:#c3d3ea;font-size:18px;max-width:560px;margin:22px 0 32px}
.hero .btns{display:flex;gap:14px;flex-wrap:wrap}
.hero .art{height:430px}

/* ===== buttons ===== */
.btn{display:inline-block;padding:14px 30px;border-radius:6px;font-weight:700;letter-spacing:.5px;font-size:14px;transition:.2s;border:none;cursor:pointer}
.btn.light{background:#fff;color:var(--navy2)}
.btn.light:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(0,0,0,.35)}
.btn.blue{background:var(--blue);color:#fff}
.btn.blue:hover{background:var(--blue2);transform:translateY(-2px)}
.btn.outline{border:1px solid rgba(255,255,255,.5);color:#fff}
.btn.outline:hover{background:rgba(255,255,255,.1)}
.btn.sm{padding:11px 22px;font-size:13px}

/* ===== sections ===== */
section{padding:76px 0}
.sec-head{max-width:760px;margin:0 auto 46px;text-align:center}
.sec-head .kick{color:var(--blue);font-weight:800;letter-spacing:2px;font-size:13px;text-transform:uppercase}
.sec-head h2{font-size:clamp(26px,3vw,38px);font-weight:800;margin-top:10px;letter-spacing:-.4px}
.sec-head p{color:var(--muted);margin-top:12px;font-size:17px}
.dark{background:linear-gradient(120deg,var(--navy),var(--navy2));color:#fff}
.dark .sec-head h2{color:#fff}.dark .sec-head p{color:#a9bfdc}
.soft{background:var(--light)}

/* stats */
.stats{background:var(--navy-deep);color:#fff}
.stats .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stats .num{font-size:40px;font-weight:800;color:var(--blue-lt)}
.stats .lbl{color:#9fb4d4;font-size:14px;margin-top:4px}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-5px);box-shadow:0 18px 40px rgba(18,40,80,.12)}
.card .thumb{height:190px;background:linear-gradient(160deg,#eaf1fb,#d5e2f4);display:flex;align-items:center;justify-content:center}
.card .body{padding:22px;flex:1;display:flex;flex-direction:column}
.card .k{font-size:12px;font-weight:800;color:var(--blue);letter-spacing:1px;text-transform:uppercase}
.card h3{font-size:20px;margin:8px 0}
.card p{color:var(--muted);font-size:14.5px;flex:1}
.card ul{color:var(--muted);font-size:14px;padding-left:18px;margin-top:6px}
.dark .card{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.13)}
.dark .card h3{color:#fff}.dark .card p,.dark .card ul{color:#b8cbe6}

/* split feature */
.split{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.split h2{font-size:clamp(26px,3vw,36px);font-weight:800;margin-bottom:16px}
.split p{color:var(--muted);margin-bottom:14px}
.checks{list-style:none;margin:18px 0 26px}
.checks li{padding:7px 0 7px 30px;position:relative;color:#31435c}
.checks li:before{content:"✓";position:absolute;left:0;top:6px;width:20px;height:20px;background:var(--blue);color:#fff;border-radius:50%;font-size:12px;display:flex;align-items:center;justify-content:center}
.dark .checks li{color:#c3d3ea}

/* band cta */
.band{background:linear-gradient(120deg,var(--navy2),var(--navy));color:#fff;text-align:center;position:relative;overflow:hidden}
.band .globe{position:absolute;left:50%;top:-300px;transform:translateX(-50%);width:800px;height:800px;border-radius:50%;
  background:radial-gradient(circle,rgba(var(--blue-rgb),.35),transparent 62%)}
.band h2{position:relative;font-size:clamp(26px,3vw,38px);font-weight:800}
.band p{position:relative;color:#b8cbe6;margin:14px auto 28px;max-width:600px}

/* page head */
.phead{background:linear-gradient(120deg,var(--navy),var(--navy2));color:#fff;padding:66px 0 60px;position:relative;overflow:hidden}
.phead .arc{position:absolute;right:-200px;top:-200px;width:700px;height:700px;border-radius:50%;border:2px solid rgba(var(--blue-rgb),.35)}
.phead h1{position:relative;font-size:clamp(30px,3.6vw,44px);font-weight:800}
.phead p{position:relative;color:#a9bfdc;margin-top:10px}
.crumb{position:relative;color:#7f97ba;font-size:14px;margin-bottom:12px}

/* table */
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.spec-table th,.spec-table td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line)}
.spec-table th{background:#eef3fa;font-weight:700}
.spec-table tr:last-child td{border-bottom:none}

/* form */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:34px}
form .row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
label{display:block;font-size:14px;font-weight:600;margin:14px 0 6px}
input,textarea,select{width:100%;padding:12px;border:1px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit}
textarea{min-height:120px;resize:vertical}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px}
.contact-card .line{display:flex;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
.contact-card .line:last-child{border-bottom:none}
.contact-card .ic{font-size:20px}

/* footer */
footer{background:var(--navy-deep);color:#8aa2c4;font-size:14px;padding:56px 0 26px}
.fgrid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:34px}
footer h4{color:#fff;font-size:15px;margin-bottom:16px}
footer a{display:block;color:#8aa2c4;padding:5px 0}
footer a:hover{color:#fff}
.fbottom{border-top:1px solid rgba(255,255,255,.08);margin-top:34px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:#6b7f9e;font-size:13px}

/* ===== 板块可编辑：补充样式 ===== */
.cards.c2{grid-template-columns:repeat(2,1fr)}
.cards.c4{grid-template-columns:repeat(4,1fr)}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .thumb.thumb-emoji{font-size:48px}
.hero.photo .inner{grid-template-columns:1fr;max-width:820px}
.hero.photo h1{font-size:clamp(32px,4.4vw,54px)}
.gt-media{display:block}
.split.rev .gt-media{order:-1}
.gt-img{width:100%;border-radius:16px;box-shadow:0 18px 44px rgba(18,40,80,.16)}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gallery.c2{grid-template-columns:repeat(2,1fr)}
.gallery.c4{grid-template-columns:repeat(4,1fr)}
.gt-fig{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:0}
.gt-fig img{width:100%;height:210px;object-fit:cover}
.gt-fig figcaption{padding:10px 14px;font-size:14px;color:var(--muted)}
.gt-text p{color:var(--muted);margin-bottom:14px;font-size:16.5px}

/* responsive */
@media(max-width:1000px){
  .cards.c4,.gallery.c4{grid-template-columns:1fr 1fr}
  .gallery{grid-template-columns:1fr 1fr}
}
@media(max-width:1000px){
  .hero .inner{grid-template-columns:1fr;padding:56px 0 64px}
  .hero .art{height:300px}
  .split{grid-template-columns:1fr;gap:30px}
  .cards{grid-template-columns:1fr 1fr}
  .form-grid{grid-template-columns:1fr}
  .stats .grid{grid-template-columns:1fr 1fr;gap:28px}
  .fgrid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .menu{display:none}
  .hamb{display:block}
  .cards{grid-template-columns:1fr}
  .cards.c2,.cards.c4,.gallery,.gallery.c2,.gallery.c4{grid-template-columns:1fr}
  .split.rev .gt-media{order:0}
  .fgrid{grid-template-columns:1fr}
  section{padding:56px 0}
  .hero .arc,.hero .globe{opacity:.5}
}