*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;background:#fff;color:#202124;line-height:1.58}
img{max-width:100%;height:auto;display:block}
a{color:#1a0dab;text-decoration:none}
a:hover{text-decoration:underline}
ul{list-style:none}
.container{width:min(652px,92vw);margin:0 auto}

.site-header{background:#fff;border-bottom:1px solid #ebebeb;padding:.65rem 0;position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;max-width:980px;margin:0 auto;width:92vw}
.logo{font-weight:700;font-size:1.15rem;color:#4285f4;letter-spacing:-.02em}
.logo b{color:#ea4335;font-weight:400}
.logo o{color:#fbbc05;font-weight:400}
.logo g{color:#4285f4;font-weight:400}
.nav-main{display:flex;flex-wrap:wrap;gap:.3rem .95rem;font-size:.82rem}
.nav-main a{color:#5f6368;font-weight:500}
.nav-main a.active{color:#1a0dab;font-weight:700;text-decoration:none}
.btn-nav{display:inline-block;background:#1a73e8;color:#fff!important;padding:.4rem .95rem;font-weight:600;font-size:.82rem;border-radius:4px;text-decoration:none!important}
.btn-nav:hover{background:#1765cc}

.section{padding:2.25rem 0}
.section-title{font-size:1.05rem;font-weight:400;color:#202124;margin-bottom:.35rem}
.section-lead{color:#5f6368;font-size:.82rem;margin-bottom:1.25rem}

.footer{background:#f8f9fa;border-top:1px solid #ebebeb;padding:2rem 0 0;font-size:.82rem;margin-top:1rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:1.5rem;margin-bottom:1.5rem;max-width:980px;margin-left:auto;margin-right:auto;width:92vw}
.footer h3{font-size:.85rem;color:#202124;margin-bottom:.55rem;font-weight:700}
.footer a{color:#1a0dab}
.footer-links{display:flex;flex-wrap:wrap;gap:.35rem .85rem}
.footer-bottom{border-top:1px solid #ebebeb;padding:1rem;text-align:center;color:#70757a;font-size:.75rem;max-width:980px;margin:0 auto;width:92vw}

.faq-list{display:flex;flex-direction:column;gap:.35rem}
.faq-item{border:1px solid #dadce0;border-radius:8px;overflow:hidden;background:#fff}
.faq-q{width:100%;text-align:left;padding:.85rem 1rem;font-weight:500;font-size:.88rem;background:transparent;border:none;cursor:pointer;color:#202124;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"+";font-size:1.15rem;color:#70757a;font-weight:400}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{display:none;padding:0 1rem .85rem;font-size:.84rem;color:#4d5156;line-height:1.65}
.faq-item.open .faq-a{display:block}

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