*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:"Inter","Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:#f5f5f5;color:#1e1e1e;line-height:1.65}
img{max-width:100%;height:auto;display:block}
a{color:#7b61ff;text-decoration:none}
a:hover{text-decoration:underline}
ul{list-style:none}
.container{width:min(1140px,92vw);margin:0 auto}

.site-header{position:sticky;top:0;z-index:100;background:#2c2c2c;border-bottom:1px solid #3d3d3d}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:.5rem 0;gap:1rem}
.logo{font-weight:800;font-size:.88rem;color:#fff;letter-spacing:.02em;display:flex;align-items:center;gap:.45rem}
.logo-sq{width:16px;height:16px;background:#7b61ff;border-radius:3px}
.nav-main{display:flex;flex-wrap:wrap;gap:.25rem .9rem;font-size:.78rem}
.nav-main a{color:#b8b8b8;font-weight:600}
.nav-main a.active,.nav-main a:hover{color:#fff;text-decoration:none}
.btn-nav{display:inline-block;background:#7b61ff;color:#fff!important;padding:.34rem .85rem;font-weight:800;font-size:.74rem;text-decoration:none!important;border-radius:6px}
.btn-nav:hover{background:#8b75ff}

.anno-bar{background:#e8e4ff;font-size:.7rem;padding:.28rem 0;color:#5a4a9a}
.anno-bar .container{display:flex;flex-wrap:wrap;gap:.35rem 1.2rem}
.anno-bar em{color:#7b61ff;font-style:normal;font-weight:700}

.section{padding:2.7rem 0}
.section-title{font-size:clamp(1.08rem,3vw,1.4rem);font-weight:800;margin-bottom:.3rem;color:#1e1e1e}
.section-lead{color:#6b6b6b;font-size:.85rem;margin-bottom:1.4rem;max-width:640px}

.frame{background:#fff;border:1px solid #e5e5e5;border-radius:8px;position:relative}
.anno{position:absolute;top:-10px;left:10px;background:#7b61ff;color:#fff;font-size:.6rem;font-weight:800;padding:.12rem .4rem;border-radius:3px;letter-spacing:.03em}

.footer{background:#2c2c2c;padding:2rem 0 0;font-size:.8rem;color:#b8b8b8}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:1.4rem;margin-bottom:1.2rem}
.footer h3{font-size:.82rem;color:#fff;margin-bottom:.45rem;font-weight:800}
.footer a{color:#b8b8b8}
.footer-links{display:flex;flex-wrap:wrap;gap:.28rem .75rem}
.footer-bottom{border-top:1px solid #3d3d3d;padding-top:.75rem;text-align:center;color:#7a7a7a;font-size:.7rem}

.faq-list{display:flex;flex-direction:column;gap:.4rem}
.faq-item{background:#fff;border:1px solid #e5e5e5;border-radius:8px}
.faq-q{width:100%;text-align:left;padding:.82rem .95rem;font-weight:800;font-size:.84rem;background:transparent;border:none;cursor:pointer;color:#1e1e1e;display:flex;justify-content:space-between;align-items:center;font-family:inherit}
.faq-q::after{content:"+";font-size:1.05rem;color:#7b61ff}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{display:none;padding:0 .95rem .82rem;font-size:.8rem;color:#6b6b6b}
.faq-item.open .faq-a{display:block}

.btn-fig{display:inline-block;background:#7b61ff;color:#fff;padding:.5rem 1.05rem;font-weight:800;font-size:.82rem;text-decoration:none!important;border-radius:6px}
.btn-fig:hover{background:#8b75ff}
.btn-ghost{display:inline-block;color:#7b61ff;border:1px solid #7b61ff;padding:.48rem 1rem;font-weight:700;font-size:.82rem;text-decoration:none!important;background:#fff;border-radius:6px}

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