:root{
  --bg:#0e1116;--panel:#151a22;--card:#1a212c;--line:#2a3341;
  --ink:#e8edf4;--mut:#9aa7b8;--gold:#f0b90b;--gold2:#f7d25c;
  --accent:#3a6fd8;--soft:#86a9ec;--maxw:1080px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;line-height:1.75}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
ul.list{margin:14px 0 0 22px}
ul.list li{margin-bottom:10px}

header.site{position:sticky;top:0;z-index:50;background:rgba(14,17,22,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:8px}
.logo .glyph{color:var(--gold);font-weight:800;font-size:1.5rem;transform:translateY(2px)}
.logo .word{font-size:1.35rem;font-weight:800;letter-spacing:.02em}
.logo .tag{font-size:.72rem;color:var(--mut);border:1px solid var(--line);padding:2px 8px;border-radius:999px}
.logo-img{height:30px;width:auto;max-width:170px;object-fit:contain;flex:none;display:block}
nav.main{display:flex;gap:14px;align-items:center;font-size:.92rem}
nav.main a{color:var(--mut);padding:6px 2px;border-bottom:2px solid transparent;font-weight:600}
nav.main a:hover,nav.main a.active{color:var(--gold);border-color:var(--gold)}
nav.main a.btn{color:#14171c}
.nav-toggle{display:none;background:none;border:0;font-size:1.6rem;color:var(--ink);cursor:pointer}

.btn{display:inline-block;background:var(--gold);color:#14171c;padding:11px 20px;border-radius:8px;font-weight:800;font-size:.93rem;white-space:nowrap;transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(240,185,11,.25)}
.btn.ghost{background:transparent;color:var(--gold);border:1.5px solid var(--gold)}
.btn.sm{padding:7px 16px;font-size:.85rem}

/* hero */
.hero{padding:72px 0 60px;background:
  radial-gradient(circle at 85% 15%, rgba(58,111,216,.18), transparent 45%),
  radial-gradient(circle at 10% 80%, rgba(240,185,11,.08), transparent 45%),
  var(--bg)}
.hsplit{display:grid;grid-template-columns:1.25fr .75fr;gap:40px;align-items:center}
.eyebrow{display:inline-block;color:var(--gold);font-weight:800;letter-spacing:.2em;font-size:.82rem;margin-bottom:14px;border:1px solid var(--line);background:var(--panel);padding:5px 14px;border-radius:999px;text-transform:uppercase}
.hero h1{font-size:clamp(2.3rem,5.5vw,3.8rem);line-height:1.05;font-weight:900;letter-spacing:-.01em;background:linear-gradient(120deg,#fff,var(--soft));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero .sub{margin:22px 0 0;max-width:600px;color:#b9c3d2;font-size:1.06rem}
.hero .cta-row{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap}
.net-art{position:relative;height:320px;display:flex;align-items:center;justify-content:center}
.orbit{position:absolute;width:270px;height:270px;border:1px solid var(--line);border-radius:50%}
.orbit:before{content:"";position:absolute;inset:26px;border:1px dashed var(--line);border-radius:50%}
.orbit span{position:absolute;left:50%;top:-5px;width:10px;height:10px;border-radius:50%;background:var(--gold);transform:translateX(-50%)}
.core{font-size:3.4rem;font-weight:900;color:var(--gold);text-shadow:0 0 34px rgba(240,185,11,.5)}

/* sections */
section.blk{padding:58px 0}
section.blk.alt{background:var(--panel)}
h2.sec{font-size:1.65rem;font-weight:800;margin-bottom:10px;color:var(--gold)}
p.sec-sub{color:var(--mut);margin-bottom:30px;max-width:640px}
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px;transition:border-color .15s}
.card:hover{border-color:var(--accent)}
.card h3{font-size:1.08rem;margin-bottom:8px;color:var(--soft)}
.card p{color:var(--mut);font-size:.94rem}
.card a{color:var(--gold)}
.split{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:start}
.panel{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px}
.ph-line{padding:12px 0;border-bottom:1px dashed var(--line);font-size:.94rem}
.ph-line:last-child{border-bottom:0}
.ph-line b{display:block;color:var(--gold);margin-bottom:3px}
.note{background:#12161d;border-left:4px solid var(--accent);padding:15px 20px;border-radius:8px;color:var(--mut);font-size:.92rem;margin-top:24px}
.narrow{max-width:820px!important}

/* page header */
.phead{padding:54px 0 30px;border-bottom:1px solid var(--line)}
.phead h1{font-size:clamp(1.9rem,4.4vw,2.9rem);font-weight:900;line-height:1.15}
.lede{margin-top:16px;max-width:680px;color:#b9c3d2;font-size:1.05rem}
.crumb{font-size:.85rem;color:var(--mut);margin-bottom:18px}
.crumb a{color:var(--gold)}

/* cta */
.cta-card{background:linear-gradient(120deg,#1a212c,#2a3341);border:1px solid var(--accent);border-radius:16px;padding:42px 38px;text-align:center}
.cta-card h2{font-size:1.5rem;font-weight:800;color:var(--gold)}
.cta-card p{color:var(--mut);margin:10px 0 24px}

/* table */
table.tb{width:100%;border-collapse:collapse;font-size:.94rem;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.tb th,.tb td{padding:13px 16px;border-bottom:1px solid var(--line);text-align:left;color:var(--mut)}
.tb th{background:var(--panel);color:var(--gold);font-weight:800}
.tb tr:last-child td{border-bottom:0}

/* faq */
.faqwrap{display:flex;flex-direction:column;gap:12px}
.faq{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.faq summary{padding:18px 22px;cursor:pointer;font-weight:700;color:var(--soft);list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.3rem;color:var(--gold)}
.faq[open] summary::after{content:"–"}
.faq .a{padding:4px 22px 18px;color:var(--mut);font-size:.94rem}

/* footer */
footer.site{border-top:1px solid var(--line);margin-top:60px;padding:40px 0 34px;color:var(--mut);font-size:.9rem;background:var(--panel)}
.ft{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
.ft nav{display:flex;gap:18px;flex-wrap:wrap}
.ft nav a:hover{color:var(--gold)}

/* screenshot gallery */
.shot-wrap{padding:66px 0}
.shot-wrap.alt{background:var(--panel)}
.shot-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:28px}
.shot{background:#0e1116;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.shot img{width:100%;height:auto;display:block;border-bottom:1px solid var(--line)}
.shot figcaption{padding:13px 17px;font-size:.9rem;color:var(--mut)}
.shot figcaption b{color:var(--gold);display:block;margin-bottom:2px}

@media(max-width:820px){
  .g3{grid-template-columns:1fr}
  .g2{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .hsplit{grid-template-columns:1fr;gap:20px}
  .net-art{height:200px}
  .shot-grid{grid-template-columns:1fr}
  .nav-toggle{display:block}
  nav.main{position:fixed;top:66px;left:0;right:0;background:var(--bg);flex-direction:column;align-items:flex-start;padding:18px 24px;gap:14px;border-bottom:1px solid var(--line);display:none}
  nav.main.open{display:flex}
  nav.main .btn{display:inline-block}
  .hero{padding:48px 0 40px}
  .phead{padding:38px 0 22px}
}