*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:"Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;color:#111;line-height:1.7;background:#fff}
img{max-width:100%;height:auto;display:block}
a{color:#111;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;background:none;border:none;cursor:pointer;color:inherit}
.wrap{width:min(1120px,90vw);margin:0 auto}

.site-header{border-bottom:1px solid #e6e6e6;background:#fff;position:sticky;top:0;z-index:20}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:1rem 0;gap:1rem}
.logo{font-size:.8rem;letter-spacing:.18em;font-weight:500}
.nav-main{display:flex;gap:1.6rem;font-size:.8rem}
.nav-main a{color:#666}
.nav-main a.active{color:#111;border-bottom:1px solid #111;padding-bottom:.1rem}
.nav-cta{font-size:.8rem;border-bottom:1px solid #111}

.section{padding:4.5rem 0}
.kicker{font-size:.72rem;letter-spacing:.2em;color:#888;margin-bottom:.5rem}
.h2{font-size:clamp(1.15rem,2.2vw,1.4rem);font-weight:500;margin-bottom:.4rem}
.lead{color:#555;font-size:.9rem;max-width:36em}

.footer{border-top:1px solid #e6e6e6;padding:2.4rem 0 0;font-size:.75rem;color:#666}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem;margin-bottom:1.5rem}
.footer h3{font-size:.72rem;letter-spacing:.16em;color:#111;font-weight:500;margin-bottom:.6rem}
.footer-links{display:flex;flex-wrap:wrap;gap:.4rem 1rem}
.footer a{border-bottom:1px solid #ccc}
.footer-bottom{border-top:1px solid #e6e6e6;padding:1rem 0;font-size:.68rem}

.faq-item{border-top:1px solid #e6e6e6}
.faq-item:last-child{border-bottom:1px solid #e6e6e6}
.faq-q{width:100%;text-align:left;padding:1rem 0;font-size:.9rem;display:flex;justify-content:space-between;gap:1rem}
.faq-q::after{content:"+";color:#999}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{display:none;padding:0 0 1rem;font-size:.84rem;color:#555}
.faq-item.open .faq-a{display:block}

.ico{width:18px;height:18px;border:1px solid #111;display:inline-block;vertical-align:middle;margin-right:.45rem}
.ico.dot{border-radius:50%}
.ico.sq{border-radius:0}
.ico.line{width:18px;height:1px;border:none;background:#111;position:relative;top:-4px}

.btn{display:inline-block;font-size:.8rem;letter-spacing:.08em;border-bottom:1px solid #111;padding-bottom:.12rem}

@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .footer-grid{grid-template-columns:1fr}
}