:root{--bg:#f5f9ff;--surface:#fff;--ink:#0f2a4a;--muted:#4a6785;--line:#cfe0f5;--brand:#1a7ae6;--brand-deep:#0d5bb8;--shadow:0 16px 40px rgba(26,122,230,.1);--max:1040px;--font:"Nunito","PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:linear-gradient(180deg,#eaf3ff 0%,#f5f9ff 28%,#fff 100%);line-height:1.85}
a{color:var(--brand);text-decoration:none}a:hover{color:var(--brand-deep);text-decoration:underline}
img{max-width:100%;height:auto;display:block}.container{width:min(100% - 2.4rem,var(--max));margin-inline:auto}
.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;z-index:1000;background:#000;color:#fff;padding:.5rem}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:76px;gap:1rem}
.brand{display:flex;align-items:center;gap:.8rem;color:inherit;text-decoration:none}
.brand img{width:44px;height:44px;border-radius:12px;object-fit:cover}
.brand-text{display:flex;flex-direction:column;line-height:1.2}.brand-text b{font-size:1.12rem;color:var(--brand-deep)}.brand-text span{font-size:.8rem;color:var(--muted)}
.nav{display:flex;align-items:center;gap:.4rem}.nav a{color:var(--ink);padding:.55rem .85rem;border-radius:999px;font-size:.95rem;text-decoration:none}
.nav a:hover,.nav a.active{background:#e3f0ff;color:var(--brand-deep)}
.menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;width:46px;height:46px;cursor:pointer;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.menu-toggle span{width:18px;height:2px;background:var(--ink);display:block}
.hero-onboard{padding:2.8rem 0 1.5rem}.hero-onboard .panel{background:#fff;border:2px solid var(--line);border-radius:28px;padding:2.2rem 2rem;box-shadow:var(--shadow);text-align:center}
.hero-onboard h1{margin:0 0 1rem;font-size:clamp(1.7rem,3.2vw,2.5rem);line-height:1.3;color:var(--brand-deep)}
.hero-onboard .lead{margin:0 auto 1.4rem;max-width:40rem;color:var(--muted);font-size:1.08rem}
.cta-row{display:flex;flex-wrap:wrap;gap:.9rem;justify-content:center}
.btn-primary,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;padding:.85rem 1.4rem;border-radius:999px;font-weight:700;text-decoration:none;font-size:1.02rem}
.btn-primary{background:var(--brand);color:#fff!important;box-shadow:0 10px 24px rgba(26,122,230,.28)}.btn-primary:hover{background:var(--brand-deep);text-decoration:none}
.btn-ghost{background:#eef6ff;color:var(--brand-deep)!important;border:1px solid var(--line)}.btn-ghost:hover{background:#ddeeff;text-decoration:none}
.section{padding:2.2rem 0}.section h2{font-size:1.55rem;margin:0 0 1rem;color:var(--brand-deep)}
.big-block{background:#fff;border:1px solid var(--line);border-radius:22px;padding:1.6rem 1.5rem;margin-bottom:1.3rem;box-shadow:0 8px 24px rgba(15,42,74,.04)}
.big-block h3{margin:0 0 .7rem;font-size:1.25rem}.big-block p{margin:0 0 .85rem}
.media-row{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem;margin:1.2rem 0}
.media-row figure{margin:0;background:#f0f7ff;border-radius:16px;overflow:hidden;border:1px solid var(--line)}
.media-row figcaption{padding:.6rem .8rem;font-size:.88rem;color:var(--muted)}
.outlinks{display:flex;flex-wrap:wrap;gap:.8rem;margin:1rem 0}
.outlinks a{background:#fff;border:2px solid var(--brand);color:var(--brand-deep);padding:.7rem 1.1rem;border-radius:14px;font-weight:700;text-decoration:none}
.outlinks a:hover{background:var(--brand);color:#fff;text-decoration:none}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:1rem 1.1rem;margin-bottom:.7rem}
.faq summary{cursor:pointer;font-weight:700;color:var(--brand-deep)}
.partners{display:flex;flex-wrap:wrap;gap:.7rem;align-items:center}.partners img{height:36px;width:auto;object-fit:contain;background:#fff;padding:6px 10px;border-radius:10px;border:1px solid var(--line)}
.site-footer{margin-top:3rem;background:#0d5bb8;color:#e8f3ff;padding:2rem 0 1.2rem}
.footer-grid{display:flex;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}.footer-grid a{color:#d6e9ff;margin-right:1rem}
.copyright{margin-top:1rem;opacity:.85;font-size:.9rem}
.page-main{padding:1.8rem 0 2.5rem}.page-hero h1{font-size:1.8rem;margin:0 0 .5rem;color:var(--brand-deep)}
.simple-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:1.5rem;margin-top:1rem}.simple-card h2{color:var(--brand-deep);margin-top:1.4rem}
.error-page{min-height:100vh;display:grid;place-items:center;padding:2rem}
.error-box{max-width:520px;width:100%;background:#fff;border:1px solid var(--line);border-radius:20px;padding:1.5rem;text-align:center;box-shadow:var(--shadow)}
.error-box h1{font-size:3rem;margin:.4rem 0;color:var(--brand)}
@media (max-width:860px){.menu-toggle{display:flex}.nav{display:none;position:absolute;left:0;right:0;top:76px;background:#fff;flex-direction:column;padding:1rem;border-bottom:1px solid var(--line)}.nav.open{display:flex}.media-row{grid-template-columns:1fr}}

/* official topbar - readable header strip */
.topbar{
  background:linear-gradient(90deg,#0b4ea2,#1260c4);
  color:#eef5ff;
  font-size:.86rem;
  padding:.45rem 0;
  line-height:1.4;
}
.topbar .container{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:.75rem;
  flex-wrap:nowrap;
}
.topbar-brand{font-weight:600;color:#fff;white-space:nowrap}
.topbar-domain{opacity:.92;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
@media (max-width:760px){
  .topbar{font-size:.8rem;padding:.4rem 0}
  .topbar .container{justify-content:center;gap:.35rem}
  .topbar-domain::before{content:"· ";opacity:.7}
}


/* ads: keep square, avoid oversized icons */
.ads-wrap.ads-header{
  margin:0;
  padding:.5rem .75rem .35rem;
  border:none;
  border-bottom:1px solid rgba(0,0,0,.06);
  border-radius:0;
  background:#fff;
}
.ads-wrap #ads{
  margin:4px 0 !important;
  gap:8px 12px !important;
}
.ads-wrap #ads img,.ads-header #ads img,#ads img{
  width:56px !important;
  height:56px !important;
  max-width:56px !important;
  max-height:56px !important;
  aspect-ratio:1/1 !important;
  object-fit:cover !important;
  object-position:center center;
  display:block;
  border-radius:12px;
}
.ads-wrap #ads figure{margin:0;width:56px}
.ads-wrap #ads > div{width:60px;flex:0 0 60px}
.ads-wrap #ads .caption,.ads-wrap #ads figcaption{
  font-size:11px;
  max-width:60px;
  margin-top:3px;
  color:#666;
}

/* full domain outlink chain */
.outlinks-chain{margin:1.2rem 0 1.6rem}
.outlinks-chain h2,.outlinks-chain h3{margin:0 0 .7rem;font-size:1.15rem}
.outlinks-chain p.note{margin:0 0 .8rem;color:#5b6b7f;font-size:.92rem}
.outlinks{
  display:flex;
  flex-wrap:wrap;
  gap:.55rem .65rem;
  margin:0;
}
.outlinks a{
  display:inline-flex;
  align-items:center;
  background:#fff;
  border:1px solid #c9daf0;
  border-radius:999px;
  padding:.4rem .85rem;
  color:#083a7a;
  text-decoration:none;
  font-weight:600;
  font-size:.88rem;
  line-height:1.3;
}
.outlinks a:hover{background:#eaf2fc;color:#0b4ea2;text-decoration:none}
.outlinks a .dom{
  margin-left:.35rem;
  font-weight:500;
  color:#5b6b7f;
  font-size:.8rem;
}
@media (max-width:760px){
  .outlinks a{font-size:.82rem;padding:.38rem .7rem}
  .outlinks a .dom{display:none}
}