:root{
  --bg:#ffffff;--soft:#f6f7f9;--text:#111111;--body:#333333;--muted:#666666;--line:#e5e7eb;
  --brand:#e31b23;--dark:#0f1115;--shadow:0 18px 38px rgba(15,23,42,.08);--radius:22px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--body);font:16px/1.75 "Microsoft YaHei","PingFang SC",sans-serif}
img{max-width:100%;height:auto;display:block} a{text-decoration:none;color:inherit}
.wrap{width:min(1120px,calc(100% - 32px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:20}.dark-header{background:var(--dark)}
.nav-row{min-height:70px;display:flex;align-items:center;gap:18px}.brand img{height:34px;width:auto;object-fit:contain;filter:brightness(0) invert(1)}
.nav{margin-left:auto;display:flex;gap:20px;color:#eef2f7}.nav a{font-size:14px}.header-cta{padding:10px 18px;border-radius:999px;background:#fff;color:var(--dark);font-weight:700;font-size:14px}
.menu-toggle{display:none;margin-left:auto;border:0;background:transparent;padding:0}.menu-toggle span{display:block;width:24px;height:2px;margin:5px 0;background:#fff}
.hero{padding:48px 0;background:linear-gradient(180deg,#f9fafb,#fff)} .hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}
.eyebrow{margin:0;font-size:12px;font-weight:800;letter-spacing:.18em;color:var(--brand)}
.hero-copy h1,.section-head h2,.cta-box h2{margin:10px 0 16px;line-height:1.15;color:var(--text)} .hero-copy h1{font-size:clamp(34px,4.5vw,56px)}
.hero-device{display:grid;gap:16px}.hero-banner,.device-pair figure,.entry-grid article,.check-grid div,.step-row article,.feature-board div,.faq-item,.cta-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-banner,.device-pair figure{margin:0;overflow:hidden}.hero-banner img{width:100%;height:220px;object-fit:cover;object-position:center}.device-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}.device-pair figure{padding:14px}.device-pair img{width:100%;object-fit:contain}
.section{padding:68px 0}.section-soft,.section-feature{background:var(--soft)}
.section-head{max-width:760px;margin-bottom:24px}.section-head p{margin:0;color:var(--muted)}
.entry-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.entry-grid article{padding:24px;border-top:4px solid var(--brand)}
.entry-grid h3,.feature-board strong{margin:0 0 10px;color:var(--text)} .entry-grid p,.check-grid span,.feature-board span{margin:0;color:var(--muted)}
.check-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.check-grid div{padding:18px}.check-grid strong{display:block;color:var(--text);margin-bottom:6px}
.step-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.step-row article{padding:22px}.step-row span{display:inline-flex;width:42px;height:42px;align-items:center;justify-content:center;border-radius:999px;background:#fff2f2;color:var(--brand);font-weight:800;margin-bottom:12px}
.step-row h3{margin:0 0 10px;color:var(--text)} .step-row p{margin:0;color:var(--muted)}
.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}.feature-board{display:grid;gap:14px}.feature-board div{padding:20px}
.faq-list{display:grid;gap:14px}.faq-item{overflow:hidden}
.faq-question{width:100%;display:flex;justify-content:space-between;gap:18px;padding:18px 22px;border:0;background:transparent;color:var(--text);font:inherit;font-weight:700;text-align:left;cursor:pointer}
.faq-question b{color:var(--brand);font-size:24px}.faq-answer{display:none;padding:0 22px 18px;color:var(--muted)}.faq-item.open .faq-answer{display:block}
.pill-row{display:flex;flex-wrap:wrap;gap:12px}.pill-row span{padding:12px 16px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#475569}
.cta-section{padding:24px 0 72px}.cta-box{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:28px;background:linear-gradient(90deg,#fff,#f3f4f6)}
.btn{display:inline-flex;min-height:48px;align-items:center;justify-content:center;padding:0 22px;border-radius:999px;background:var(--brand);color:#fff;font-weight:700}
@media (max-width:980px){
  .hero-grid,.device-pair,.entry-grid,.check-grid,.step-row,.feature-grid{grid-template-columns:1fr}
  .nav{display:none;width:100%;order:4;flex-direction:column;padding-bottom:16px}.nav.open{display:flex}
  .menu-toggle{display:block}.header-cta{display:none}.nav-row{flex-wrap:wrap}.cta-box{flex-direction:column;align-items:flex-start}
}
@media (max-width:640px){.wrap{width:min(100% - 24px,1120px)}.section{padding:54px 0}.hero-copy h1{font-size:34px}.hero-banner img{height:auto;object-fit:contain}}

.site-logo,
.logo img,
.brand img,
.header-logo img,
.nav-logo img {
  display: block;
  width: auto !important;
  height: auto !important;
  max-height: 40px !important;
  max-width: 180px !important;
  object-fit: contain !important;
}

.brand,
.logo,
.header-logo,
.nav-logo {
  overflow: visible !important;
}

.site-header .brand,
header .brand,
header .logo,
header .header-logo,
header .nav-logo {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}