:root{
  --bg:#ffffff;
  --surface:#ffffff;
  --surface-2:#f6f9ff;
  --ink:#162033;
  --muted:#61708a;
  --line:#e4ebf7;
  --accent:#2f7cf6;
  --accent-2:#6bd6ff;
  --accent-3:#eef5ff;
  --success:#18a875;
  --warning:#e79b2f;
  --shadow:0 24px 70px rgba(47,124,246,.13);
  --shadow-soft:0 12px 34px rgba(27,47,81,.08);
  --radius:22px;
  --radius-lg:34px;
  --container:1180px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{
  min-width:320px;
  color:var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(47,124,246,.12), transparent 32rem),
    radial-gradient(circle at 88% 6%, rgba(107,214,255,.18), transparent 34rem),
    var(--bg);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","Noto Sans TC","Noto Sans JP","Noto Sans KR","Noto Sans Khmer","Microsoft YaHei",Arial,sans-serif;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

:lang(zh-CN) body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans SC","Microsoft YaHei",Arial,sans-serif}
:lang(zh-TW) body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC","Microsoft JhengHei",Arial,sans-serif}
:lang(ja) body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic","Meiryo",Arial,sans-serif}
:lang(ko) body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans KR","Malgun Gothic",Arial,sans-serif}
:lang(ru) body,:lang(en) body,:lang(en-SG) body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif}
:lang(km) body{font-family:"Noto Sans Khmer","Khmer OS",Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;line-height:1.85}

a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit}
svg{display:block}
.container{width:min(100% - 40px,var(--container));margin-inline:auto}
.page-glow{position:fixed;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(255,255,255,.1),rgba(255,255,255,.88) 46%,rgba(255,255,255,.98));z-index:-1}

.site-header{position:sticky;top:0;z-index:100;border-bottom:1px solid rgba(228,235,247,.78);background:rgba(255,255,255,.82);backdrop-filter:blur(18px) saturate(160%)}
.nav{height:78px;display:flex;align-items:center;gap:28px}
.brand{display:inline-flex;align-items:center;gap:12px;min-width:max-content}
.brand-logo{width:42px;height:42px;border-radius:15px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent-2));box-shadow:0 14px 28px rgba(47,124,246,.25)}
.brand-logo svg{width:30px;height:30px}
.brand-logo rect{fill:transparent}
.brand-logo path{fill:var(--surface)}
.brand-copy{display:grid;line-height:1.12}
.brand-copy strong{font-size:20px;letter-spacing:-.02em}
.brand-copy small{font-size:11px;color:var(--muted);font-weight:700;letter-spacing:.08em;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:6px;margin-left:auto}
.nav-links a{padding:10px 13px;border-radius:999px;color:#394960;font-size:14px;font-weight:700;transition:.2s ease}
.nav-links a:hover{color:var(--accent);background:var(--accent-3)}
.nav-actions{display:flex;align-items:center;gap:10px}

.language{position:relative}
.lang-btn{height:42px;display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.9);color:var(--ink);padding:0 12px;cursor:pointer;font-weight:800;font-size:13px;box-shadow:0 8px 18px rgba(27,47,81,.04)}
.lang-btn svg{width:16px;height:16px;fill:currentColor}
.lang-dot{width:8px;height:8px;border-radius:999px;background:var(--success);box-shadow:0 0 0 5px rgba(24,168,117,.12)}
.lang-menu{position:absolute;right:0;top:calc(100% + 10px);min-width:230px;max-height:min(420px,70vh);overflow:auto;margin:0;padding:8px;list-style:none;border:1px solid var(--line);border-radius:18px;background:var(--surface);box-shadow:var(--shadow);z-index:120}
.lang-menu li{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;border-radius:12px;color:#394960;font-weight:750;font-size:14px;cursor:pointer}
.lang-menu li:hover,.lang-menu li.active{background:var(--accent-3);color:var(--accent)}
.lang-menu small{color:var(--muted);font-weight:650}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:999px;min-height:44px;padding:10px 18px;font-weight:850;letter-spacing:-.01em;transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease;color .2s ease}
.btn:hover{transform:translateY(-2px)}
.btn.primary{background:linear-gradient(135deg,var(--accent),#5aa4ff);color:var(--surface);box-shadow:0 18px 34px rgba(47,124,246,.28)}
.btn.primary:hover{box-shadow:0 24px 42px rgba(47,124,246,.34)}
.btn.soft{background:var(--accent-3);color:var(--accent);border-color:#dbeaff}
.btn.ghost{background:rgba(255,255,255,.75);color:var(--ink);border-color:var(--line)}
.btn.compact{min-height:42px;padding:8px 15px;font-size:14px}
.btn.large{min-height:52px;padding:13px 24px}

.menu-btn{display:none;width:42px;height:42px;border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:10px;cursor:pointer}
.menu-btn span{display:block;height:2px;background:var(--ink);border-radius:999px;margin:5px 0}
.mobile-drawer{display:none}

.hero{position:relative;padding:86px 0 56px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:22px auto auto 50%;width:620px;height:620px;transform:translateX(-6%);border-radius:50%;background:radial-gradient(circle,rgba(47,124,246,.12),rgba(107,214,255,.08) 42%,transparent 68%);z-index:-1}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.03fr) minmax(360px,.97fr);gap:58px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:9px;padding:8px 13px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.84);box-shadow:0 10px 26px rgba(27,47,81,.04);color:var(--accent);font-size:13px;font-weight:850}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2))}
.hero h1{max-width:760px;margin:22px 0 18px;font-size:clamp(24px,3vw,34px);line-height:1.25;letter-spacing:-.025em}
.lead{max-width:680px;margin:0;color:var(--muted);font-size:18px;line-height:1.9}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.hero-note{margin-top:22px;color:#70809a;font-size:14px}

.hero-panel{position:relative}
.hero-panel::before{content:"";position:absolute;inset:-24px -8px auto auto;width:190px;height:190px;border-radius:42px;background:linear-gradient(135deg,rgba(47,124,246,.14),rgba(107,214,255,.2));transform:rotate(12deg);z-index:-1}
.window-card{position:relative;padding:20px;border:1px solid rgba(228,235,247,.9);border-radius:32px;background:linear-gradient(180deg,rgba(255,255,255,.92),rgba(255,255,255,.78));box-shadow:var(--shadow);overflow:hidden}
.window-card::after{content:"";position:absolute;inset:auto -80px -92px auto;width:220px;height:220px;border-radius:50%;background:rgba(47,124,246,.1)}
.window-top{display:flex;align-items:center;gap:8px;border-bottom:1px dashed var(--line);padding:2px 4px 16px;margin-bottom:16px}
.window-top span{width:11px;height:11px;border-radius:50%;background:#ff7a90}
.window-top span:nth-child(2){background:#ffd36b}
.window-top span:nth-child(3){background:#5de0a6}
.window-top strong{margin-left:8px;font-size:13px;color:#53627a}
.status-line{display:flex;align-items:center;justify-content:space-between;padding:18px;border:1px solid var(--line);border-radius:20px;background:var(--surface)}
.status-line span{color:var(--muted);font-weight:750}
.status-line strong{color:var(--success);font-size:22px}
.node-card{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.node-card>div,.traffic>div{padding:16px;border:1px solid var(--line);border-radius:20px;background:var(--surface-2)}
.node-card small,.traffic span{display:block;color:var(--muted);font-weight:760;font-size:12px}
.node-card b,.traffic strong{display:block;margin-top:4px;font-size:16px}
.traffic{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.wave{height:92px;margin:18px 2px 14px;display:flex;align-items:end;gap:10px}
.wave i{flex:1;border-radius:999px;background:linear-gradient(180deg,var(--accent-2),var(--accent));height:36%;animation:wave 2.1s ease-in-out infinite}
.wave i:nth-child(2){height:72%;animation-delay:.15s}
.wave i:nth-child(3){height:48%;animation-delay:.3s}
.wave i:nth-child(4){height:88%;animation-delay:.45s}
.wave i:nth-child(5){height:62%;animation-delay:.6s}
@keyframes wave{50%{transform:scaleY(.68);opacity:.78}}
.chip-row{display:flex;flex-wrap:wrap;gap:8px}
.chip-row span,.protocol-cloud span{display:inline-flex;align-items:center;justify-content:center;border:1px solid #dce9fb;border-radius:999px;background:var(--surface);color:#40516a;font-weight:850;box-shadow:0 8px 18px rgba(27,47,81,.04)}
.chip-row span{padding:8px 11px;font-size:12px}

.stats{padding:14px 0 64px}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.stat-grid article{padding:24px;border:1px solid var(--line);border-radius:24px;background:rgba(255,255,255,.78);box-shadow:var(--shadow-soft);text-align:center}
.stat-grid strong{display:block;font-size:34px;line-height:1;color:var(--accent);letter-spacing:-.04em}
.stat-grid span{display:block;margin-top:8px;color:var(--muted);font-weight:750}

.section{padding:92px 0}
.porcelain{background:linear-gradient(180deg,rgba(246,249,255,.76),rgba(255,255,255,.92));border-block:1px solid rgba(228,235,247,.74)}
.section-head{text-align:center;max-width:760px;margin:0 auto 42px}
.section-head>span,.split-head span,.copy-block>span,.download-card span{display:inline-block;margin-bottom:10px;color:var(--accent);font-size:12px;font-weight:900;letter-spacing:.14em;text-transform:uppercase}
h2{margin:0;color:var(--ink);font-size:clamp(30px,4vw,48px);line-height:1.1;letter-spacing:-.045em}
.section-head p,.split-head p,.copy-block p,.download-card p{color:var(--muted);font-size:17px}
.section-head p{margin:14px 0 0}

.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feature-card{position:relative;overflow:hidden;padding:28px;border:1px solid var(--line);border-radius:26px;background:var(--surface);box-shadow:0 8px 22px rgba(27,47,81,.04);transition:.22s ease}
.feature-card::after{content:"";position:absolute;right:-56px;top:-56px;width:130px;height:130px;border-radius:50%;background:var(--accent-3);transition:.22s ease}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-soft);border-color:#cfe0f8}
.feature-card:hover::after{transform:scale(1.25)}
.feature-card h3{position:relative;margin:18px 0 8px;font-size:20px;letter-spacing:-.02em;z-index:1}
.feature-card p{position:relative;margin:0;color:var(--muted);z-index:1}
.feature-card,.scenario-grid article,.steps li,.tips-list article,.timeline article,.stat-grid article{opacity:0;transform:translateY(18px);transition:opacity .55s ease var(--delay,0ms),transform .55s ease var(--delay,0ms)}
.feature-card.is-visible,.scenario-grid article.is-visible,.steps li.is-visible,.tips-list article.is-visible,.timeline article.is-visible,.stat-grid article.is-visible{opacity:1;transform:translateY(0)}
.icon{position:relative;display:grid;place-items:center;width:52px;height:52px;border-radius:18px;background:var(--accent-3);z-index:1}
.icon::before,.icon::after{content:"";position:absolute;background:var(--accent);border-radius:6px}
.icon-1::before{width:26px;height:8px;top:15px}.icon-1::after{width:18px;height:8px;top:29px}
.icon-2::before{width:9px;height:26px;left:15px}.icon-2::after{width:9px;height:18px;right:15px;bottom:13px}
.icon-3::before{width:27px;height:18px;border-radius:7px}.icon-3::after{width:12px;height:6px;bottom:11px}
.icon-4::before{width:28px;height:7px;top:15px}.icon-4::after{width:20px;height:7px;top:29px}
.icon-5::before{width:27px;height:27px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2))}.icon-5::after{width:13px;height:13px;border-radius:50%;background:var(--surface)}
.icon-6::before{width:28px;height:20px;border-radius:8px}.icon-6::after{width:10px;height:14px;background:var(--surface)}

.split-head{display:grid;grid-template-columns:minmax(0,.8fr) minmax(280px,.7fr);gap:32px;align-items:end;margin-bottom:38px}
.split-head p{margin:0}
.protocol-cloud{display:flex;flex-wrap:wrap;gap:12px}
.protocol-cloud span{min-height:48px;padding:11px 18px;font-size:15px}

.two-col{display:grid;grid-template-columns:minmax(0,.85fr) minmax(340px,1fr);gap:34px;align-items:start}
.copy-block{position:sticky;top:110px}
.copy-block p{margin:16px 0 0}
.compare-card,.tips-list{display:grid;gap:14px}
.compare-card div,.tips-list article,.scenario-grid article{padding:24px;border:1px solid var(--line);border-radius:24px;background:var(--surface);box-shadow:var(--shadow-soft)}
.compare-card strong{display:block;font-size:22px;color:var(--accent);margin-bottom:8px}
.compare-card span,.tips-list p,.scenario-grid p{color:var(--muted)}
.scenario-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.scenario-grid h3,.tips-list h3{margin:0 0 8px;font-size:20px}
.scenario-grid p,.tips-list p{margin:0}

.timeline{display:grid;gap:14px}
.timeline article{display:grid;grid-template-columns:160px 1fr;gap:22px;align-items:center;padding:22px;border:1px solid var(--line);border-radius:24px;background:var(--surface);box-shadow:0 8px 22px rgba(27,47,81,.04)}
.timeline time{color:var(--accent);font-size:24px;font-weight:950;letter-spacing:-.04em}
.timeline p{margin:0;color:var(--muted)}

.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;list-style:none;margin:0;padding:0;counter-reset:step}
.steps li{padding:28px;border:1px solid var(--line);border-radius:28px;background:var(--surface);box-shadow:var(--shadow-soft)}
.steps b{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:var(--surface);font-size:15px}
.steps h3{margin:18px 0 8px;font-size:22px}
.steps p{margin:0;color:var(--muted)}

.download{padding:90px 0}
.download-card{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:38px;border:1px solid var(--line);border-radius:var(--radius-lg);background:linear-gradient(135deg,#ffffff,#f2f7ff);box-shadow:var(--shadow)}
.download-card p{max-width:640px;margin:14px 0 0}
.download-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:flex-end}

.faq-list{display:grid;gap:14px;max-width:920px;margin-inline:auto}
.faq-list details{border:1px solid var(--line);border-radius:22px;background:var(--surface);box-shadow:0 8px 22px rgba(27,47,81,.04);padding:18px 20px}
.faq-list summary{cursor:pointer;list-style:none;font-weight:900;font-size:17px}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";float:right;color:var(--accent);font-size:24px;line-height:1}
.faq-list details[open] summary::after{content:"−"}
.faq-list p{margin:12px 0 0;color:var(--muted)}

.footer{padding:62px 0 28px;border-top:1px solid var(--line);background:#fbfdff}
.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:26px}
.footer p{max-width:360px;color:var(--muted)}
.footer h3{margin:0 0 12px;color:var(--ink);font-size:14px;letter-spacing:.08em;text-transform:uppercase}
.footer a:not(.brand){display:block;padding:5px 0;color:#50617b;font-weight:700}
.footer a:not(.brand):hover{color:var(--accent)}
.copyright{display:flex;justify-content:space-between;gap:16px;margin-top:38px;padding-top:20px;border-top:1px solid var(--line);color:#71819a;font-size:13px}

@media (max-width:1080px){
  .nav-links{display:none}
  .menu-btn{display:block}
  .hero-grid,.two-col,.split-head{grid-template-columns:1fr}
  .copy-block{position:static}
  .feature-grid,.scenario-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .download-card{align-items:flex-start;flex-direction:column}
  .download-actions{justify-content:flex-start}
  .mobile-drawer{position:fixed;inset:78px 0 auto;z-index:90;border-bottom:1px solid var(--line);background:rgba(255,255,255,.96);box-shadow:var(--shadow-soft)}
  .mobile-drawer.open{display:block}
  .mobile-drawer nav{display:grid;gap:4px;width:min(100% - 40px,var(--container));margin:0 auto;padding:14px 0}
  .mobile-drawer a{padding:12px 14px;border-radius:14px;color:#394960;font-weight:850}
  .mobile-drawer a:hover{background:var(--accent-3);color:var(--accent)}
}

@media (max-width:720px){
  .container{width:min(100% - 28px,var(--container))}
  .nav{height:70px;gap:12px}
  .brand-copy small{display:none}
  .nav-actions .compact{display:none}
  .lang-btn{max-width:150px}
  #langLabel{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .hero{padding:56px 0 34px}
  .hero-grid{gap:34px}
  .lead{font-size:16px}
  .hero-actions .btn{width:100%}
  .hero-panel{min-width:0}
  .node-card,.traffic,.stat-grid,.feature-grid,.scenario-grid,.steps,.footer-grid{grid-template-columns:1fr}
  .timeline article{grid-template-columns:1fr;gap:8px}
  .section{padding:66px 0}
  .download{padding:66px 0}
  .download-card{padding:26px}
  .download-actions,.download-actions .btn{width:100%}
  .footer{padding-top:44px}
  .copyright{flex-direction:column}
}