/* ==========================================================
   Echo · 官网首页（品牌主站）
   浅色底 + 品牌蓝 #3E86F5，居中品牌版式 + 双产品入口
   ========================================================== */
:root{
  --blue:#3E86F5;
  --blue-d:#2E73E0;
  --blue-l:#EAF0FF;
  --ink:#0F172A;
  --ink-2:#334155;
  --muted:#64748B;
  --line:#E7EBF2;
  --bg:#FFFFFF;
  --bg-soft:#F7F9FC;
  --radius:20px;
  --maxw:1200px;
  --pad:clamp(20px,4vw,40px);
  --shadow:0 24px 60px rgba(15,23,42,.1);
  --shadow-sm:0 10px 28px rgba(15,23,42,.07);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",-apple-system,"Segoe UI",sans-serif;font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img,svg{display:block}
::selection{background:var(--blue);color:#fff}
::-webkit-scrollbar{width:10px}
::-webkit-scrollbar-thumb{background:#CBD5E1;border-radius:99px}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.section{padding:clamp(64px,7.5vw,100px) 0}
.center{text-align:center}
.kicker{display:inline-flex;align-items:center;font-size:11.5px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--blue);margin-bottom:10px}
.kicker::before{content:"";width:24px;height:2px;border-radius:2px;background:currentColor;margin-right:10px;opacity:.85}
.sec-title{font-size:clamp(26px,3.2vw,36px);font-weight:800;letter-spacing:-.02em;line-height:1.25}
.sec-sub{color:var(--muted);font-size:15px;margin-top:10px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:inherit;font-size:14.5px;font-weight:600;padding:13px 24px;border-radius:12px;border:1px solid transparent;cursor:pointer;transition:.2s}
.btn:active{transform:translateY(1px)}
.btn-blue{background:linear-gradient(180deg,#4C92F7,var(--blue-d));color:#fff;box-shadow:0 12px 26px rgba(62,134,245,.32)}
.btn-blue:hover{background:linear-gradient(180deg,var(--blue),var(--blue-d));box-shadow:0 16px 36px rgba(62,134,245,.44)}
.btn-line{border-color:var(--line);color:var(--ink-2);background:#fff}
.btn-line:hover{border-color:var(--blue);color:var(--blue)}
.btn svg{transition:transform .25s}
.btn:hover svg{transform:translateX(3px)}

/* ---------- 顶栏（深色 hero 上的透明顶栏，滚动变白） ---------- */
.topbar{position:fixed;inset:0 0 auto;z-index:90;height:72px;transition:background .3s,box-shadow .3s,border-color .3s;border-bottom:1px solid transparent}
.topbar.on{background:rgba(255,255,255,.92);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom-color:var(--line);box-shadow:0 6px 24px rgba(15,23,42,.05)}
.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.logo{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:-.01em;color:#fff;transition:color .3s}
.topbar.on .logo{color:var(--ink)}
.logo img{width:28px;height:28px;flex:0 0 auto;display:block}
.logo span{font-size:11px;color:rgba(255,255,255,.7);letter-spacing:.16em;font-weight:600}
.topbar.on .logo span{color:var(--muted)}
.menu{display:flex;align-items:center;gap:26px;margin-left:auto}
.menu a{font-size:14px;color:rgba(255,255,255,.82);transition:color .2s;position:relative;padding:4px 0}
.menu a:hover{color:#fff}
.topbar.on .menu a{color:var(--ink-2)}
.topbar.on .menu a:hover,.topbar.on .menu a.active{color:var(--blue)}
.menu a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;background:currentColor}
.nav-right{display:flex;align-items:center;gap:10px}
.burger{display:none;width:42px;height:40px;border:1px solid rgba(255,255,255,.4);border-radius:11px;background:rgba(255,255,255,.08);cursor:pointer}
.topbar.on .burger{border-color:var(--line);background:#fff}
.burger s{display:block;width:16px;height:1.6px;background:#fff;margin:4px auto;transition:.25s;border-radius:2px}
.topbar.on .burger s{background:var(--ink)}
.burger.on s:nth-child(2){opacity:0}
.burger.on s:nth-child(1){transform:translateY(5.6px) rotate(45deg)}
.burger.on s:nth-child(3){transform:translateY(-5.6px) rotate(-45deg)}

/* ---------- HERO（居中式 · 对齐 omvv.com 源码） ---------- */
.hero{position:relative;padding:172px 0 132px;overflow:hidden;text-align:center;color:#fff;
  background:#08152F url("../assets/hero.jpg") center 42%/cover no-repeat}
.hero::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;background:radial-gradient(60% 55% at 50% -8%,rgba(62,134,245,.24),transparent 62%)}
.hero-veil{position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,rgba(5,11,26,.6) 0%,rgba(5,11,26,.34) 40%,rgba(5,11,26,.72) 100%)}
.hero-in{position:relative;z-index:2;margin:0 auto}
.hero-badge{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;letter-spacing:.06em;
  padding:7px 14px;border-radius:99px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.24);backdrop-filter:blur(6px)}
.hero h1{font-size:clamp(32px,4.6vw,56px);font-weight:800;letter-spacing:-.02em;line-height:1.22;margin:26px 0 0;text-shadow:0 8px 34px rgba(3,8,20,.5)}
.hero .lead{max-width:600px;margin:20px auto 0;font-size:15.5px;color:rgba(255,255,255,.86);text-shadow:0 4px 18px rgba(3,8,20,.45)}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:34px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:30px}
.hero-meta{display:flex;gap:34px;justify-content:center;flex-wrap:wrap;margin-top:44px;padding-top:28px;border-top:1px solid rgba(255,255,255,.16)}
.hero-meta div{display:flex;align-items:center;gap:10px}
.hero-meta svg{flex:0 0 auto;color:rgba(255,255,255,.85)}
.hero-meta b{display:block;font-size:13.5px;font-weight:700;color:#fff;line-height:1.4}
.hero-meta span{display:block;font-size:12px;color:rgba(255,255,255,.62);line-height:1.4}
.mono{font-variant-numeric:tabular-nums}

/* ---------- 悬浮配置卡（finder） ---------- */
.finder{margin-top:-62px;position:relative;z-index:5}
.finder-card{background:#fff;border-radius:24px;box-shadow:var(--shadow);padding:20px;display:grid;
  grid-template-columns:1.1fr 1.1fr 1.4fr auto;gap:14px;align-items:center;transition:box-shadow .3s,transform .3s cubic-bezier(.2,.7,.2,1)}
.finder-card:hover{transform:translateY(-3px);box-shadow:0 30px 72px rgba(15,23,42,.14)}
.field{background:var(--bg-soft);border-radius:16px;padding:12px 16px}
.field span{display:block;font-size:11.5px;color:var(--muted);letter-spacing:.04em}
.field b{display:block;font-size:14.5px;font-weight:600;margin-top:2px;color:var(--ink)}
.field .chips{display:flex;gap:6px;margin-top:7px;flex-wrap:wrap}
.chip{font-size:11.5px;color:var(--blue);background:var(--blue-l);border-radius:99px;padding:2px 9px}
.finder-btn{width:60px;height:60px;border-radius:50%;background:var(--blue);border:0;cursor:pointer;display:grid;place-items:center;color:#fff;box-shadow:0 12px 26px rgba(62,134,245,.35);transition:background .2s,transform .2s}
.finder-btn:hover{background:var(--blue-d);transform:translateY(-2px)}

/* ---------- 双产品入口 ---------- */
.prods{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:44px}
.prod{position:relative;background:#fff;border:1px solid var(--line);border-radius:24px;padding:32px 30px 30px;display:flex;flex-direction:column;transition:transform .3s cubic-bezier(.2,.7,.2,1),box-shadow .3s,border-color .3s}
.prod:hover{transform:translateY(-8px);box-shadow:var(--shadow);border-color:transparent}
.prod-ico{width:54px;height:54px;border-radius:16px;display:grid;place-items:center;background:var(--blue-l);color:var(--blue);margin-bottom:20px}
.prod h3{font-size:22px;font-weight:800;letter-spacing:-.015em}
.prod .role{font-size:13px;color:var(--blue);font-weight:600;margin-top:6px}
.prod p{font-size:14.5px;color:var(--muted);margin-top:12px;line-height:1.8}
.prod ul{margin:18px 0 24px;display:grid;gap:10px}
.prod li{font-size:14px;color:var(--ink-2);display:flex;gap:10px;align-items:flex-start}
.prod li::before{content:"✓";flex:0 0 auto;color:var(--blue);font-weight:700}
.prod .btn{margin-top:auto;align-self:flex-start}
.prod-badge{position:absolute;top:22px;right:22px;font-size:11px;font-weight:700;letter-spacing:.06em;color:var(--blue);background:var(--blue-l);border-radius:99px;padding:4px 12px}

/* ---------- 共同优势 ---------- */
.advs{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:40px}
.adv{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;transition:.3s}
.adv::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;border-radius:var(--radius) var(--radius) 0 0;background:linear-gradient(90deg,var(--blue),rgba(62,134,245,.15));opacity:0;transition:opacity .3s}
.adv:hover::before{opacity:1}
.adv:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.adv .ai{width:44px;height:44px;border-radius:13px;background:var(--blue-l);color:var(--blue);display:grid;place-items:center;margin-bottom:16px}
.adv h3{font-size:17px;font-weight:700}
.adv p{font-size:14px;color:var(--muted);margin-top:8px;line-height:1.75}

/* ---------- 数据条 ---------- */
.mbar{margin-top:44px;display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.mbar div{padding:24px 20px;border-right:1px solid var(--line);text-align:center}
.mbar div:last-child{border-right:0}
.mbar b{display:block;font-size:28px;font-weight:800;letter-spacing:-.02em;color:var(--blue)}
.mbar span{font-size:12.5px;color:var(--muted)}

/* ---------- 支持区 ---------- */
.support{display:grid;grid-template-columns:1fr auto;gap:36px;align-items:center;background:var(--bg-soft);border-radius:24px;padding:clamp(28px,4vw,44px)}
.support h3{font-size:22px;font-weight:800;letter-spacing:-.015em}
.support p{font-size:14.5px;color:var(--muted);margin-top:10px;max-width:52ch}
.support .acts{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.qrbox{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;text-align:center;box-shadow:0 10px 28px rgba(15,23,42,.06)}
.qrbox img{width:132px;height:132px;border-radius:12px}
.qrbox span{display:block;font-size:12px;color:var(--muted);margin-top:10px}

/* ---------- CTA ---------- */
.cta{position:relative;border-radius:28px;overflow:hidden;padding:clamp(56px,8vw,96px) clamp(24px,5vw,64px);text-align:center;color:#fff;background:#0B2247}
.cta-dots{position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(3,9,24,.72) 0%,rgba(3,9,24,.5) 46%,rgba(3,9,24,.82) 100%)}
.cta-in{position:relative;z-index:2}
.cta h2{font-size:clamp(26px,3.6vw,42px);font-weight:800;letter-spacing:-.02em;line-height:1.28}
.cta p{color:rgba(255,255,255,.8);font-size:15px;margin:16px auto 30px;max-width:560px}
.cta .hero-cta{margin-top:0}
.btn-white{background:#fff;color:var(--ink)}
.btn-white:hover{color:var(--blue)}
.btn-ghost-w{border-color:rgba(255,255,255,.55);color:#fff;background:rgba(255,255,255,.08)}
.btn-ghost-w:hover{background:rgba(255,255,255,.18)}

/* ---------- 页脚 ---------- */
.foot{position:relative;padding:64px 0 34px;color:#E9EDF3;background:linear-gradient(180deg,rgba(6,12,26,.88),rgba(6,12,26,.96)),url("../assets/hero.jpg") center 86%/cover no-repeat,#08152F}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px}
.foot h4{font-size:13px;font-weight:700;color:#fff;margin-bottom:14px}
.foot li{margin-bottom:9px}
.foot a{font-size:13.5px;color:rgba(255,255,255,.62);transition:color .2s}
.foot a:hover{color:#8FB4FF}
.foot-brand{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:800;color:#fff}
.foot-brand img{width:26px;height:26px;flex:0 0 auto;display:block}
.foot p.desc{color:rgba(255,255,255,.6);font-size:13.5px;margin-top:14px;max-width:32ch}
.disclaimer{margin-top:36px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);font-size:12px;color:rgba(255,255,255,.45);line-height:1.9;max-width:98ch}
.foot-bottom{margin-top:20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12.5px;color:rgba(255,255,255,.5)}

/* ---------- 弹窗 / 工具 ---------- */
.modal{position:fixed;inset:0;z-index:120;display:none;align-items:center;justify-content:center;padding:20px}
.modal.show{display:flex}
.modal-mask{position:absolute;inset:0;background:rgba(6,12,26,.6);backdrop-filter:blur(4px)}
.modal-card{position:relative;z-index:1;width:100%;max-width:340px;background:#fff;border-radius:20px;padding:30px 28px 26px;text-align:center;box-shadow:0 30px 80px rgba(6,12,26,.4);animation:modalIn .28s cubic-bezier(.2,.7,.2,1)}
@keyframes modalIn{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
.modal-close{position:absolute;top:8px;right:10px;width:34px;height:34px;border:0;background:none;color:var(--muted);font-size:24px;line-height:1;cursor:pointer;border-radius:9px;font-family:inherit}
.modal-close:hover{background:var(--bg-soft)}
.modal-title{font-size:19px;font-weight:700}
.modal-sub{font-size:13px;color:var(--muted);margin:6px 0 18px}
.modal-qr{width:210px;height:210px;object-fit:cover;border:1px solid var(--line);border-radius:14px;margin:0 auto}
.modal-tip{font-size:12.5px;color:var(--muted);margin:15px 0 18px;line-height:1.7}
.modal-btn{width:100%}
.totop{position:fixed;right:24px;bottom:28px;width:46px;height:46px;border-radius:50%;border:1px solid var(--line);background:#fff;color:var(--ink-2);display:grid;place-items:center;cursor:pointer;z-index:80;box-shadow:var(--shadow-sm);opacity:0;pointer-events:none;transition:.3s}
.totop.show{opacity:1;pointer-events:auto}
.totop:hover{color:var(--blue);border-color:var(--blue)}
.rv{opacity:0;transform:translateY(16px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
.rv.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1000px){
  .prods,.advs{grid-template-columns:1fr}
  .mbar{grid-template-columns:repeat(2,1fr)}
  .mbar div:nth-child(2n){border-right:0}
  .support{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .menu{position:absolute;top:72px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:#fff;border-bottom:1px solid var(--line);padding:8px var(--pad) 18px;transform:translateY(-10px);opacity:0;pointer-events:none;transition:.25s}
  .menu.show{transform:none;opacity:1;pointer-events:auto}
  .menu a{padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
  .menu a::after{display:none}
  .burger{display:block}
  .hero{padding:130px 0 100px}
  .hero-meta{gap:20px}
  .finder{margin-top:-44px}
}
@media (max-width:620px){
  .mbar{grid-template-columns:1fr}
  .mbar div{border-right:0;border-bottom:1px solid var(--line)}
  .finder-card{grid-template-columns:1fr}
}