:root{--ink:#eaf1ff;--muted:#9eacc7;--line:#233653;--navy:#07142b;--card:#0d1e3b;--aqua:#58e3d0;--blue:#5996ff}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--navy);color:var(--ink);font:16px/1.6 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
[hidden]{display:none!important}
a{color:var(--aqua)}
button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--aqua);outline-offset:5px}
.header,main,footer{max-width:1180px;margin:auto}
.header{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 28px}
.brand{color:#fff;text-decoration:none;font-weight:800;font-size:25px;letter-spacing:-1.4px}
.brand-mark{display:inline-grid;place-items:center;background:var(--aqua);color:#07142b;border-radius:7px;width:19px;height:26px;font-size:19px;margin-right:1px}
.brand-dot{color:var(--aqua)}
nav{display:flex;gap:26px}
nav a{color:#b9c5d9;text-decoration:none;font-size:14px}
nav a:hover{color:#fff}
h1,h2,h3,p{margin-top:0}
.hero{padding:30px 28px 56px;text-align:center;background:radial-gradient(ellipse 52% 62% at 50% 55%,#163c665e,transparent 78%)}
h1{font-size:clamp(29px,4vw,46px);font-weight:750;line-height:1.16;letter-spacing:-.045em;margin:0 0 12px}
.lead{color:var(--muted);margin:0 auto 26px;font-size:16px}
.test-card{max-width:780px;margin:auto;text-align:left;border:1px solid #2b4566;border-radius:22px;background:linear-gradient(135deg,rgba(19,48,86,.95),rgba(8,25,52,.95));box-shadow:0 20px 65px #00000024;overflow:hidden;position:relative}
.speed-results{display:grid;grid-template-columns:1fr 1fr;padding:28px 16px 20px}
.speed-metric{padding:0 26px;min-width:0}
.speed-metric+div{border-left:1px solid #36506e}
.speed-metric h2{font-size:17px;color:#b9c9df;font-weight:500;margin:0 0 10px;display:flex;gap:9px;align-items:center}
.speed-metric h2 span{color:var(--aqua);font-size:22px}
.metric-number{display:flex;align-items:baseline;gap:10px}
.metric-number strong{font-size:clamp(37px,5.5vw,66px);font-variant-numeric:tabular-nums;font-weight:700;letter-spacing:-.055em;line-height:1.18;white-space:nowrap}
.metric-number span{font-size:13px;color:var(--muted);white-space:nowrap}
.speed-metric.active strong{color:var(--aqua)}
.speed-metric.active h2 span{animation:breathe 1.3s ease-in-out infinite}
.latency-results{display:flex;justify-content:center;gap:50px;padding:16px 25px;border-top:1px solid #2d4562;border-bottom:1px solid #2d4562;background:#071b352e}
.latency-results div{display:flex;gap:9px;align-items:baseline}
.latency-results span,.latency-results small{font-size:13px;color:var(--muted)}
.latency-results strong{font-size:20px;font-variant-numeric:tabular-nums}
.test-controls{text-align:center;padding:17px 24px 24px}
.test-controls p{font-size:14px;color:#b9c9df;min-height:23px;margin:0 0 13px}
.start{font:inherit;font-weight:700;border:0;cursor:pointer;padding:13px 25px;background:var(--aqua);color:#062037;border-radius:10px;box-shadow:0 6px 18px #40d5c21f;min-width:220px;text-decoration:none;display:inline-block}
.start:hover{background:#88f1e2}
.start span{margin-left:15px}
.start:disabled{opacity:.65;cursor:wait}
.progress-track{height:3px;background:#0a203e}
#progress{height:100%;width:0;background:var(--aqua);transition:width .25s linear}
.test-note{display:flex;gap:20px;justify-content:center;color:#8fa1be;font-size:12px;margin:14px 0 0}
.test-note a{color:#aebbd1}
.uses{padding:65px 28px;background:#0a1932}
.section-head{margin-bottom:32px}
.section-head h2,.content h2,.faq h2{font-size:32px;line-height:1.2;letter-spacing:-.04em;margin:0}
.use-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.use-grid article{padding:25px;background:#0d2140;border:1px solid #213958;border-radius:15px}
.use-icon{display:block;width:32px;height:32px;color:var(--aqua);fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.use-grid h3{font-size:17px;margin:18px 0 7px}
.use-grid p,.content p,.faq p{color:var(--muted);font-size:14px;margin:0}
.content,.faq{width:100%;max-width:900px;margin-inline:auto;padding:65px 28px}
.content-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:28px}
.content b{color:var(--ink)}
.faq{padding-top:10px}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-weight:650;list-style:none}
.faq summary:after{content:"+";float:right;color:var(--aqua);font-size:22px}
.faq details[open] summary:after{content:"-"}
.faq details p{padding:13px 28px 2px 0}
.article{max-width:820px;padding:65px 28px 90px}
.article h1{font-size:clamp(34px,5vw,54px)}
.article h2{margin-top:35px;font-size:27px;letter-spacing:-.03em}
.article p,.article li{color:#c1cce0}
.article li{margin-bottom:12px}
footer{border-top:1px solid var(--line);padding:30px 28px;display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:13px}
footer p{margin:0}
@keyframes breathe{50%{opacity:.4}}
@media(max-width:720px){
.header{height:62px;padding:0 18px}nav{gap:18px}nav a{font-size:12px}
.hero{padding:22px 16px 38px}
h1{font-size:30px;max-width:400px;margin:0 auto 12px}
.lead{font-size:14px;max-width:310px;margin-bottom:23px}
.speed-results{padding:22px 0 18px}
.speed-metric{padding:0 18px}
.speed-metric h2{font-size:15px;margin-bottom:10px}
.metric-number{display:block}
.metric-number strong{font-size:44px;display:block}
.metric-number span{font-size:12px}
.latency-results{gap:30px;padding:14px 12px}
.test-controls{padding:13px 18px 20px}
.test-controls p{font-size:13px}
.test-note{font-size:11px}
.uses,.content,.faq{padding:45px 18px}
.section-head h2,.content h2,.faq h2{font-size:27px}
.use-grid{grid-template-columns:1fr 1fr;gap:12px}
.use-grid article{padding:18px}
.content-grid{grid-template-columns:1fr;gap:20px}
footer{padding:25px 18px;display:grid;gap:10px}
}
@media(max-width:360px){nav a{font-size:11px}.speed-metric{padding:0 13px}.metric-number strong{font-size:37px}.latency-results{gap:18px}.use-grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.speed-metric.active h2 span{animation:none}#progress{transition:none}}
.guide-links{display:grid;grid-template-columns:1fr 1fr;gap:0 36px;margin-top:24px}
.guide-links a{padding:15px 0;border-bottom:1px solid var(--line);text-decoration:none;color:#c1cce0;font-size:15px}
.guide-links a:hover{color:var(--aqua)}
.back-link{display:inline-block;font-size:14px;margin-bottom:20px}
.article{overflow-wrap:break-word}
.article h1{font-size:clamp(30px,4vw,44px);line-height:1.15}
.article h2{font-size:26px;line-height:1.25}
.article ol,.article ul{padding-left:23px}
.article-actions{margin-top:30px}
.related{border-top:1px solid var(--line);margin-top:42px;padding-top:4px}
.related h2{font-size:22px}
.table-wrap{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:14px;line-height:1.6}
th,td{padding:14px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--ink)}td{color:#c1cce0}td:first-child{width:30%;color:var(--ink)}
@media(max-width:720px){.guide-links{grid-template-columns:1fr}.article{padding:32px 18px 50px}.article h2{font-size:23px}.hero{padding-top:18px}.lead{max-width:320px}}