*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --teal:#0f766e;
  --teal-light:#14b8a6;
  --teal-soft:#ccfbf1;
  --teal-dark:#115e59;
  --bg:#f8fafb;
  --surface:#fff;
  --ink:#134e4a;
  --text:#1e293b;
  --muted:#64748b;
  --line:#e2e8f0;
  --glow:rgba(15,118,110,.18);
  --max:920px;
  --radius:12px;
  --hub-size:min(680px,92vw);
}
html{scroll-behavior:smooth;scroll-padding-top:5.5rem}
body{
  font-family:"Noto Sans SC",system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.82;
  font-size:16px;
  min-height:100vh;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(100% - 2rem,var(--max));margin-inline:auto}

.hub-bg{
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(circle at 50% 38%,rgba(15,118,110,.08) 0%,transparent 45%),
    radial-gradient(circle at 12% 88%,rgba(15,118,110,.04) 0%,transparent 35%),
    radial-gradient(circle at 88% 12%,rgba(20,184,166,.05) 0%,transparent 38%),
    var(--bg);
}
.hub-bg::before{
  content:"";position:absolute;inset:0;
  background:repeating-radial-gradient(circle at 50% 42%,transparent 0,transparent 52px,rgba(15,118,110,.025) 52px,rgba(15,118,110,.025) 53px);
}

.site-header{
  position:sticky;top:0;z-index:200;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-row{display:flex;align-items:center;justify-content:space-between;min-height:64px}
.brand{display:flex;align-items:center;gap:.65rem;font-weight:600;color:var(--ink);font-size:1rem}
.brand img{border-radius:50%;border:2px solid var(--teal-soft)}
.site-nav ul{display:flex;gap:1.1rem;list-style:none}
.site-nav a{color:var(--muted);font-size:.95rem}
.site-nav a.active,.site-nav a:hover{color:var(--teal)}
.nav-toggle{
  display:none;border:1px solid var(--line);width:42px;height:42px;border-radius:10px;
  cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px;background:#fff;padding:6px;
}
.nav-toggle span{width:22px;height:2px;background:var(--text);display:block;transition:transform .2s,opacity .2s}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.ads-top-bar{border-bottom:1px solid var(--line);background:#fff;padding:.55rem 0}
.applist-title{font-size:.78rem;color:var(--muted);text-align:center;margin-bottom:.35rem}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem}
.ads-item figure{margin:0;text-align:center}
.ads-item img{width:65px;height:65px;border-radius:10px;object-fit:cover;border:1px solid var(--line)}
.ads-item .caption{font-size:11px;color:var(--muted);max-width:76px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.hero-hub{padding:2.25rem 0 1rem;text-align:center}
.hero-hub .intro{max-width:700px;margin:0 auto 1.75rem}
.hero-tag{
  display:inline-block;padding:.3rem .9rem;background:var(--teal-soft);
  border:1px solid rgba(15,118,110,.25);border-radius:999px;
  font-size:.78rem;color:var(--teal-dark);margin-bottom:.85rem;letter-spacing:.03em;
}
.hero-hub h1{
  font-size:clamp(1.4rem,3.2vw,1.95rem);line-height:1.35;
  margin-bottom:.85rem;color:var(--ink);font-weight:700;
}
.hero-hub .lead{color:#334155;margin-bottom:.75rem;text-align:justify;font-size:1.02rem}
.hero-hub .lead strong{color:var(--ink);font-weight:600}

.radial-hub{
  position:relative;width:var(--hub-size);aspect-ratio:1;margin:0 auto 1.5rem;
}
.hub-ring{
  position:absolute;border-radius:50%;border:1px dashed rgba(15,118,110,.22);pointer-events:none;
}
.hub-ring:nth-child(1){inset:6%}
.hub-ring:nth-child(2){inset:20%;opacity:.65}
.hub-ring:nth-child(3){inset:34%;opacity:.4}

.hub-core{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:10;
  width:120px;height:120px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  background:radial-gradient(circle,rgba(15,118,110,.12) 0%,var(--surface) 72%);
  border:2px solid var(--teal);border-radius:50%;
  box-shadow:0 0 36px var(--glow),inset 0 0 20px rgba(15,118,110,.08);
  text-decoration:none;color:var(--ink);transition:box-shadow .3s,transform .3s;
}
.hub-core:hover{
  box-shadow:0 0 48px rgba(15,118,110,.28),inset 0 0 24px rgba(15,118,110,.12);
  transform:translate(-50%,-50%) scale(1.04);text-decoration:none;color:var(--ink);
}
.hub-core img{width:52px;height:52px;border-radius:50%;margin-bottom:.3rem}
.hub-core span{font-size:.68rem;font-weight:600;color:var(--teal);letter-spacing:.04em}

.hub-spoke{
  --angle:0deg;position:absolute;top:50%;left:50%;width:0;height:0;
  transform:rotate(var(--angle));z-index:5;
}
.spoke-stem{
  position:absolute;top:0;left:0;width:2px;
  height:calc(var(--hub-size) * 0.26);
  background:linear-gradient(to bottom,var(--teal),rgba(15,118,110,.1));
  transform-origin:top center;transform:translateX(-50%);
}
.spoke-node{
  position:absolute;top:calc(var(--hub-size) * 0.26);left:0;
  transform:translate(-50%,-50%) rotate(calc(-1 * var(--angle)));
  min-width:86px;max-width:108px;padding:.5rem .6rem;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:0 4px 16px rgba(15,118,110,.08);
  text-decoration:none;color:var(--text);transition:border-color .2s,box-shadow .2s,background .2s;
}
.spoke-node:hover,.spoke-node.is-active{
  border-color:var(--teal);box-shadow:0 6px 20px var(--glow);text-decoration:none;color:var(--teal-dark);
}
.spoke-node strong{display:block;font-size:.82rem;line-height:1.25;margin-bottom:.15rem}
.spoke-node small{display:block;font-size:.68rem;color:var(--muted);line-height:1.2}

.partner-row{
  display:flex;flex-wrap:wrap;justify-content:center;gap:.6rem;padding:.5rem 0 1.25rem;
}
.partner-row a{
  padding:.42rem .9rem;border:1px solid var(--line);border-radius:999px;
  font-size:.86rem;color:var(--teal);background:var(--teal-soft);
}
.partner-row a:hover{border-color:var(--teal);text-decoration:none}

.spoke-nav{
  position:sticky;top:64px;z-index:100;
  background:rgba(255,255,255,.94);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);padding:.65rem 0;
}
.spoke-nav-scroll{
  display:flex;gap:.45rem;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch;
}
.spoke-nav-scroll::-webkit-scrollbar{display:none}
.spoke-nav-scroll a{
  flex-shrink:0;padding:.35rem .75rem;border:1px solid var(--line);border-radius:999px;
  font-size:.78rem;color:var(--muted);white-space:nowrap;background:#fff;
}
.spoke-nav-scroll a:hover{border-color:var(--teal);color:var(--teal);text-decoration:none}

.spoke-panel{padding:2rem 0;border-top:1px solid var(--line);scroll-margin-top:6rem}
.spoke-panel:last-of-type{border-bottom:1px solid var(--line)}
.panel-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.5rem 1.65rem;border-left:4px solid var(--teal);
}
.panel-card h2{font-size:1.15rem;color:var(--teal);margin-bottom:.85rem;font-weight:700}
.panel-card p,.panel-card li{margin-bottom:.85rem;text-align:justify;color:#334155}
.panel-card p:last-child{margin-bottom:0}
.panel-card ul,.panel-card ol{padding-left:1.25rem}
.panel-card figure{margin:1.15rem 0}
.panel-card figure img{max-width:min(100%,520px);border-radius:10px;margin:0 auto;border:1px solid var(--line)}
.panel-card figcaption{font-size:.78rem;color:var(--muted);text-align:center;margin-top:.4rem}
.tip-box{
  background:var(--teal-soft);border-left:4px solid var(--teal);
  padding:.85rem 1rem;border-radius:0 var(--radius) var(--radius) 0;margin:1rem 0;font-size:.94rem;
}
.split{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;align-items:start}
@media(max-width:720px){.split{grid-template-columns:1fr}}

.faq-wrap{padding:2rem 0 2.5rem}
.faq-wrap h2{font-size:1.15rem;margin-bottom:.85rem;color:var(--ink)}
.faq-wrap details{border:1px solid var(--line);border-radius:var(--radius);padding:1rem;margin-bottom:.65rem;background:#fff}
.faq-wrap summary{cursor:pointer;font-weight:600;color:var(--ink)}
.faq-wrap p{margin-top:.55rem;color:#444;font-size:.94rem}

.page-head{padding:2rem 0 1rem;border-bottom:1px solid var(--line)}
.page-head h1{font-size:1.55rem;margin:.4rem 0 0;color:var(--ink)}
.breadcrumb{font-size:.82rem;color:var(--muted)}
.breadcrumb a{color:var(--teal)}
.prose-page{padding:2rem 0 3rem}
.prose-page h2{color:var(--teal);margin:1.5rem 0 .75rem;font-size:1.1rem}
.prose-page p,.prose-page li{margin-bottom:.85rem;text-align:justify;color:#334155}
.prose-page ul{padding-left:1.25rem}

.site-footer{border-top:1px solid var(--line);padding:2rem 0;text-align:center;color:var(--muted);font-size:.88rem;background:#fff}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem;margin-bottom:.65rem}
.footer-links a{color:var(--muted)}

.error-page{min-height:60vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:3rem 1rem}
.error-page .code{font-size:4rem;font-weight:700;color:var(--teal);margin:0;line-height:1}
.error-page h1{margin:.75rem 0 1rem;font-size:1.3rem}
.error-page p{color:var(--muted)}

@media(max-width:768px){
  .nav-toggle{display:flex}
  .site-nav{
    display:none;position:absolute;top:64px;left:0;right:0;
    background:#fff;border-bottom:1px solid var(--line);padding:1rem 1.25rem;
    box-shadow:0 8px 24px rgba(0,0,0,.06);
  }
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:.75rem}
  .radial-hub{margin-bottom:1rem}
  .spoke-node{min-width:76px;max-width:92px;padding:.4rem .5rem}
  .spoke-node strong{font-size:.74rem}
  .spoke-node small{font-size:.62rem}
  .hub-core{width:100px;height:100px}
  .hub-core img{width:44px;height:44px}
  .spoke-panel{scroll-margin-top:5rem}
}