/* ===== Neon Pool Ball City — 官网样式（霓虹暗色） ===== */
:root{
  --bg:#05070f; --bg2:#0a0e1c; --card:#0e1426; --line:#1c2440;
  --txt:#e7ecf7; --muted:#9aa6c4; --cyan:#22d3ee; --blue:#3b82f6;
  --purple:#a855f7; --grad:linear-gradient(135deg,#22d3ee,#3b82f6 55%,#a855f7);
  --r:16px; --maxw:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  background:var(--bg);color:var(--txt);line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(60% 50% at 80% -5%,rgba(59,130,246,.18),transparent 60%),
    radial-gradient(50% 45% at 5% 10%,rgba(168,85,247,.16),transparent 60%),
    radial-gradient(45% 40% at 50% 100%,rgba(34,211,238,.12),transparent 60%);
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
[dir="rtl"] body{direction:rtl}

/* 容器 */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* 顶部导航 */
.nav{
  position:sticky;top:0;z-index:50;backdrop-filter:blur(12px);
  background:rgba(5,7,15,.72);border-bottom:1px solid var(--line);
}
.nav .wrap{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.3px}
.brand img{width:34px;height:34px;border-radius:9px}
.brand b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;white-space:nowrap}
.nav-links{display:flex;gap:6px;margin-inline-start:auto;align-items:center;flex-wrap:wrap}
.nav-links a{padding:8px 12px;border-radius:10px;color:var(--muted);font-size:14px;font-weight:600;transition:.2s}
.nav-links a:hover,.nav-links a.active{color:var(--txt);background:rgba(255,255,255,.05)}
/* 语言选择 */
.lang{position:relative}
.lang select{
  appearance:none;background:var(--card);color:var(--txt);border:1px solid var(--line);
  border-radius:10px;padding:8px 30px 8px 12px;font-size:14px;font-weight:600;cursor:pointer;
}
.lang::after{content:"▾";position:absolute;inset-inline-end:10px;top:50%;transform:translateY(-50%);color:var(--muted);pointer-events:none}

/* Hero */
.hero{padding:72px 0 40px;text-align:center}
.hero .badge{display:inline-block;font-size:13px;font-weight:700;color:var(--cyan);
  border:1px solid rgba(34,211,238,.35);border-radius:999px;padding:6px 14px;margin-bottom:20px;background:rgba(34,211,238,.08)}
.hero h1{font-size:clamp(34px,6vw,58px);line-height:1.1;font-weight:900;letter-spacing:-.5px;margin-bottom:18px}
.hero h1 .g{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(16px,2.4vw,20px);color:var(--muted);max-width:680px;margin:0 auto 28px}
.cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:15px;
  padding:13px 24px;border-radius:12px;transition:.2s;border:1px solid transparent;cursor:pointer}
.btn.primary{background:var(--grad);color:#04101f;box-shadow:0 8px 30px rgba(59,130,246,.35)}
.btn.primary:hover{transform:translateY(-2px);box-shadow:0 12px 38px rgba(59,130,246,.5)}
.btn.ghost{border-color:var(--line);color:var(--txt);background:rgba(255,255,255,.03)}
.btn.ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* 截图画廊 */
.shots{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:44px 0}
.shots img{border-radius:14px;border:1px solid var(--line);box-shadow:0 10px 40px rgba(0,0,0,.5)}

/* 通用区块 */
section.blk{padding:46px 0}
.h2{font-size:clamp(24px,4vw,34px);font-weight:850;text-align:center;margin-bottom:10px}
.sub{color:var(--muted);text-align:center;max-width:640px;margin:0 auto 34px}

/* 特性卡 */
.feats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feat{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px;transition:.2s}
.feat:hover{border-color:rgba(34,211,238,.4);transform:translateY(-3px)}
.feat .ic{font-size:28px;margin-bottom:12px}
.feat h3{font-size:18px;font-weight:750;margin-bottom:8px}
.feat p{color:var(--muted);font-size:15px}

/* 法律/文档页 */
.doc{max-width:820px;margin:0 auto;padding:40px 0 20px}
.doc h1{font-size:clamp(28px,5vw,40px);font-weight:900;margin-bottom:8px}
.doc .meta{color:var(--muted);font-size:14px;margin-bottom:30px}
.doc h2{font-size:21px;font-weight:800;margin:30px 0 10px;color:var(--cyan)}
.doc h3{font-size:17px;font-weight:750;margin:20px 0 6px}
.doc p,.doc li{color:var(--txt);opacity:.92;margin-bottom:12px}
.doc ul{padding-inline-start:22px;margin-bottom:14px}
.doc li{margin-bottom:7px}
.doc a{color:var(--cyan);text-decoration:underline}
.doc .box{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 22px;margin:18px 0}

/* 支持页联系卡 */
.contact{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;margin:26px 0}
.contact .card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px 28px;text-align:center;min-width:240px}
.contact .card .ic{font-size:30px;margin-bottom:10px}
.contact .card a{color:var(--cyan);font-weight:700;font-size:17px}
.faq{max-width:760px;margin:30px auto 0}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:4px 20px;margin-bottom:12px}
.faq summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:inline-end;color:var(--cyan);font-size:20px}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--muted);padding:0 0 16px}

/* 页脚 */
footer{border-top:1px solid var(--line);margin-top:50px;padding:36px 0;background:var(--bg2)}
footer .wrap{display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
footer .fl{display:flex;gap:16px;flex-wrap:wrap}
footer a{color:var(--muted);font-size:14px;transition:.2s}
footer a:hover{color:var(--cyan)}
footer .cp{color:var(--muted);font-size:13px}

@media(max-width:780px){
  .shots{grid-template-columns:repeat(2,1fr)}
  .feats{grid-template-columns:1fr}
  .nav .wrap{height:auto;padding:10px 20px;flex-wrap:wrap}
  .nav-links{margin-inline-start:0;width:100%;justify-content:center}
}