/* =========================================================
   Jiahui Zhenpin — site styles
   纯静态、零外部依赖（无 CDN / 无 webfont），可直接部署
   ========================================================= */
:root{
  --ink:#0f1b1e;
  --ink-2:#2b3a3e;
  --sub:#63757a;
  --line:#e4ebec;
  --bg:#f7fafa;
  --card:#ffffff;
  --cyan:#007789;
  --cyan-2:#00a3b8;
  --cyan-soft:#eaf6f8;
  --max:1080px;
  --r:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline}
ul{padding-left:1.2em}
li{margin:.35em 0}
:focus-visible{outline:2px solid var(--cyan-2);outline-offset:3px;border-radius:4px}

/* 双语切换 */
html[data-lang="zh"] .en{display:none}
html[data-lang="en"] .zh{display:none}

.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-9999px;top:0;background:#fff;padding:10px 16px;z-index:99}
.skip:focus{left:12px;top:12px}

/* ---------- header ---------- */
header.site{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:640;letter-spacing:-.2px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand svg{width:28px;height:28px;flex:none}
.brand small{display:block;font-size:10px;font-weight:500;color:var(--sub);letter-spacing:.12em;margin-top:-3px}
nav.links{display:flex;gap:22px;margin-left:auto;align-items:center}
nav.links a{color:var(--ink-2);font-size:14.5px;font-weight:500}
nav.links a[aria-current="page"]{color:var(--cyan)}
.lang{display:flex;border:1px solid var(--line);border-radius:9px;overflow:hidden;margin-left:8px}
.lang button{
  border:0;background:#fff;color:var(--sub);font:inherit;font-size:12.5px;
  padding:6px 10px;cursor:pointer;font-family:inherit;
}
.lang button[aria-pressed="true"]{background:var(--cyan-soft);color:var(--cyan);font-weight:600}

/* ---------- hero ---------- */
.hero{
  background:
    radial-gradient(900px 420px at 82% -10%, #dff3f6 0%, rgba(223,243,246,0) 62%),
    linear-gradient(180deg,#ffffff 0%,#f7fafa 100%);
  border-bottom:1px solid var(--line);
}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;padding:64px 0 70px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12.5px;color:var(--cyan);
  background:var(--cyan-soft);border:1px solid #d3ebef;padding:5px 12px;border-radius:99px;font-weight:600;
}
h1{font-size:clamp(28px,4vw,44px);line-height:1.25;letter-spacing:-1px;margin:20px 0 16px;font-weight:680}
.lede{font-size:17px;color:var(--sub);max-width:30em;margin:0 0 28px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;border-radius:11px;padding:12px 20px;
  font-size:15px;font-weight:600;border:1px solid transparent;transition:.16s;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn.primary{background:var(--cyan);color:#fff}
.btn.primary:hover{background:#00646f}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--ink-2)}
.btn.ghost:hover{border-color:#c9dfe3}

.device{display:flex;justify-content:center}
.device svg{width:100%;max-width:320px;height:auto}

/* ---------- sections ---------- */
section.block{padding:66px 0}
section.block.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.h2{font-size:clamp(22px,2.6vw,30px);letter-spacing:-.5px;margin:0 0 12px;font-weight:660}
.h2-sub{color:var(--sub);margin:0 0 34px;max-width:44em}
.grid{display:grid;gap:18px}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px;
}
.card h3{margin:0 0 8px;font-size:17px;letter-spacing:-.2px}
.card p{margin:0;color:var(--sub);font-size:14.5px}
.icon{
  width:38px;height:38px;border-radius:11px;background:var(--cyan-soft);color:var(--cyan);
  display:grid;place-items:center;margin-bottom:14px;
}
.icon svg{width:20px;height:20px;fill:currentColor}

/* ---------- product ---------- */
.product{display:grid;grid-template-columns:.9fr 1.1fr;gap:44px;align-items:center}
.spec{width:100%;border-collapse:collapse;font-size:14.5px;margin-top:6px}
.spec th,.spec td{text-align:left;padding:11px 0;border-bottom:1px solid var(--line);vertical-align:top}
.spec th{color:var(--sub);font-weight:500;width:38%}
.spec tr:last-child th,.spec tr:last-child td{border-bottom:0}

/* ---------- company ---------- */
.facts{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.fact{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:20px 22px}
.fact dt{font-size:12px;color:var(--sub);margin:0 0 4px;letter-spacing:.04em}
.fact dd{margin:0;font-size:15px;font-weight:560}

/* ---------- contact ---------- */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:34px}
.contact address{font-style:normal;color:var(--ink-2);line-height:2}
.kv{display:flex;gap:10px;padding:9px 0;border-bottom:1px solid var(--line);font-size:14.5px}
.kv:last-child{border-bottom:0}
.kv b{font-weight:560;color:var(--sub);min-width:86px;flex:none}

/* ---------- prose (privacy / support) ---------- */
.prose{max-width:760px}
.prose h2{font-size:22px;margin:38px 0 10px;letter-spacing:-.3px}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:16.5px;margin:24px 0 6px}
.prose p,.prose li{color:var(--ink-2);font-size:15px}
.prose .muted{color:var(--sub);font-size:13.5px}
.note{
  background:var(--cyan-soft);border:1px solid #d3ebef;border-radius:12px;
  padding:14px 18px;font-size:14px;color:#0b5560;margin:18px 0;
}
details.faq{border-bottom:1px solid var(--line);padding:14px 0}
details.faq summary{cursor:pointer;font-weight:560;font-size:15.5px;list-style:none}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::before{content:"+";color:var(--cyan);margin-right:10px;font-weight:700}
details.faq[open] summary::before{content:"−"}
details.faq p{margin:10px 0 0;color:var(--sub);font-size:14.5px}

/* ---------- footer ---------- */
footer.site{background:#0f1b1e;color:#b8c7ca;padding:44px 0 34px;font-size:14px}
footer.site a{color:#cfe6ea}
.f-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
footer .brand{color:#fff}
footer .brand small{color:#8aa0a4}
.f-legal{margin-top:32px;padding-top:20px;border-top:1px solid #24363a;color:#7c9094;font-size:12.5px;line-height:1.9}
footer h4{color:#fff;font-size:13px;margin:0 0 10px;letter-spacing:.06em;text-transform:uppercase}
footer ul{list-style:none;padding:0;margin:0}
footer li{margin:6px 0}

/* ---------- responsive ---------- */
@media (max-width:880px){
  .hero-inner{grid-template-columns:1fr;padding:44px 0 50px}
  .device{order:-1}
  .device svg{max-width:230px}
  .grid.c3,.grid.c2{grid-template-columns:1fr}
  .product{grid-template-columns:1fr;gap:26px}
  .facts,.contact{grid-template-columns:1fr}
  .f-grid{grid-template-columns:1fr;gap:22px}
  nav.links{gap:14px}
  nav.links a.hide-sm{display:none}
  section.block{padding:48px 0}
}
@media (max-width:520px){
  .nav{height:60px;gap:14px}
  .brand small{display:none}
  nav.links a{font-size:13.5px}
  .lang button{padding:5px 8px;font-size:11.5px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}