/* KuaiLsi Static Site Stylesheet */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#0f172a;background:#fcfbf8;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}

:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --accent:#4f46e5;
  --text:#0f172a;
  --muted:#64748b;
  --border:#e5e7eb;
  --bg-soft:#f8fafc;
  --bg-hero:linear-gradient(180deg,#ffffff 0%,#eef2ff 60%,#e0e7ff 100%);
  --radius:14px;
  --shadow-sm:0 2px 8px rgba(15,23,42,.06);
  --shadow-md:0 10px 30px rgba(37,99,235,.15);
}

.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid rgba(15,23,42,.06)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--text)}
.brand img{width:32px;height:32px}
.nav-links{display:flex;gap:32px;align-items:center}
.nav-links a{color:#334155;font-size:15px;font-weight:500;transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:var(--primary)}
.nav-right{display:flex;align-items:center;gap:16px}
.lang{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border:1px solid var(--border);border-radius:999px;font-size:14px;color:#334155}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:999px;font-weight:600;font-size:15px;transition:transform .15s ease,box-shadow .2s ease,background .2s ease;cursor:pointer;border:0}
.btn-primary{background:var(--primary);color:#fff;box-shadow:var(--shadow-md)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px)}
.btn-outline{background:#fff;color:#0f172a;border:1px solid var(--border)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-lg{padding:16px 28px;font-size:16px}

/* Hero */
.hero{background:var(--bg-hero);padding:96px 0 120px;text-align:center;position:relative;overflow:hidden}
.hero h1{font-size:clamp(38px,6vw,72px);font-weight:800;line-height:1.1;letter-spacing:-.02em;margin-bottom:24px}
.hero h1 .accent{background:linear-gradient(90deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:19px;color:var(--muted);max-width:640px;margin:0 auto 40px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:24px}
.hero-badges{display:flex;gap:24px;justify-content:center;flex-wrap:wrap;font-size:14px;color:#475569}
.hero-badges span{display:inline-flex;align-items:center;gap:6px}

/* Section */
.section{padding:96px 0}
.section-alt{background:var(--bg-soft)}
.section-dark{background:#0b1220;color:#e2e8f0}
.section-dark h2,.section-dark h3{color:#fff}
.section-title{text-align:center;font-size:clamp(28px,3.6vw,42px);font-weight:800;letter-spacing:-.01em;margin-bottom:16px}
.section-sub{text-align:center;color:var(--muted);font-size:17px;max-width:640px;margin:0 auto 56px}

/* Feature grid */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
@media (max-width:900px){.grid-3,.grid-4,.grid-2{grid-template-columns:1fr}}

.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.card .icon{width:56px;height:56px;border-radius:14px;background:linear-gradient(135deg,#dbeafe,#e0e7ff);display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:20px}
.card h3{font-size:20px;font-weight:700;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}

/* Stats */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;text-align:center;padding:56px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.stats .num{font-size:44px;font-weight:800;background:linear-gradient(90deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.stats .lbl{color:var(--muted);margin-top:6px}
@media (max-width:700px){.stats{grid-template-columns:1fr;gap:24px}}

/* Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
@media (max-width:900px){.split{grid-template-columns:1fr}}
.split h2{font-size:36px;font-weight:800;margin-bottom:20px}
.split ul.checks li{position:relative;padding-left:32px;margin-bottom:14px;color:#334155}
.split ul.checks li::before{content:"✓";position:absolute;left:0;top:0;width:22px;height:22px;border-radius:50%;background:var(--primary);color:#fff;font-size:13px;display:inline-flex;align-items:center;justify-content:center}
.split .visual{border-radius:20px;overflow:hidden;box-shadow:0 20px 60px rgba(15,23,42,.15)}

/* Platforms */
.platforms{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
@media (max-width:900px){.platforms{grid-template-columns:repeat(2,1fr)}}
.platform{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;text-align:center}
.platform .p-icon{font-size:38px;margin-bottom:12px}
.platform h4{font-weight:700;margin-bottom:14px}
.platform a.dl{color:var(--primary);font-weight:600;font-size:14px}

/* FAQ */
.faq-list{max-width:820px;margin:0 auto}
.faq{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px 28px;margin-bottom:14px}
.faq summary{cursor:pointer;font-weight:600;font-size:17px;list-style:none;display:flex;justify-content:space-between;align-items:center;color:#0f172a}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--primary);font-weight:400}
.faq[open] summary::after{content:"−"}
.faq .answer{margin-top:14px;color:#475569;font-size:15px}
.faq .answer p{margin:10px 0}
.faq .answer strong{color:var(--primary)}

/* Nodes */
.node-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm)}
.node-table th,.node-table td{padding:16px 20px;text-align:left;border-bottom:1px solid var(--border);font-size:15px}
.node-table th{background:var(--bg-soft);font-weight:600;color:#334155;font-size:14px;text-transform:uppercase;letter-spacing:.05em}
.node-table tr:last-child td{border-bottom:0}
.node-table .status{display:inline-flex;align-items:center;gap:6px;color:#059669;font-weight:600}
.node-table .status::before{content:"";width:8px;height:8px;background:#10b981;border-radius:50%;box-shadow:0 0 0 4px rgba(16,185,129,.2)}
.ping{font-family:ui-monospace,monospace;color:var(--primary);font-weight:600}

/* Timeline / about */
.timeline{max-width:720px;margin:0 auto;position:relative;padding-left:32px;border-left:2px solid var(--border)}
.timeline .item{position:relative;margin-bottom:36px}
.timeline .item::before{content:"";position:absolute;left:-40px;top:6px;width:14px;height:14px;border-radius:50%;background:var(--primary);border:3px solid #fff;box-shadow:0 0 0 2px var(--primary)}
.timeline .year{font-weight:700;color:var(--primary);margin-bottom:6px}
.timeline .desc{color:#475569}

/* CTA banner */
.cta-banner{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;text-align:center;padding:72px 24px;border-radius:24px;margin:80px auto;max-width:1120px}
.cta-banner h2{font-size:36px;font-weight:800;margin-bottom:14px;color:#fff}
.cta-banner p{opacity:.9;margin-bottom:28px}
.cta-banner .btn{background:#fff;color:var(--primary)}
.cta-banner .btn:hover{background:#f1f5f9}

/* Footer */
.footer{background:#0b1220;color:#94a3b8;padding:64px 0 32px;font-size:14px}
.footer .grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
@media (max-width:900px){.footer .grid{grid-template-columns:1fr 1fr}}
.footer h5{color:#fff;font-size:15px;margin-bottom:16px;font-weight:600}
.footer ul li{margin-bottom:10px}
.footer ul li a:hover{color:#fff}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:18px;margin-bottom:14px}
.footer-brand img{width:28px;height:28px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:#64748b}

/* Mobile nav */
@media (max-width:900px){
  .nav-links{display:none}
  .hero{padding:64px 0 80px}
  .section{padding:64px 0}
}

/* Page hero (inner pages) */
.page-hero{background:var(--bg-hero);padding:80px 0 64px;text-align:center}
.page-hero h1{font-size:clamp(32px,5vw,56px);font-weight:800;letter-spacing:-.02em;margin-bottom:16px}
.page-hero p{color:var(--muted);font-size:18px;max-width:640px;margin:0 auto}

/* Protocol visual */
.flow{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap;padding:40px 0;font-weight:600;color:#334155}
.flow .step{background:#fff;border:1px solid var(--border);border-radius:12px;padding:14px 20px;display:inline-flex;align-items:center;gap:8px}
.flow .arrow{color:var(--primary);font-size:22px}