:root{
  --bg:#f5f8fd;--surface:#ffffff;--ink:#0f1b33;--muted:#5b6985;--line:#e1e8f3;
  --blue:#2563eb;--blue-d:#1747b8;--blue-l:#e8f0ff;--teal:#0ea5a4;--warn:#f59e0b;
  --radius:16px;--shadow:0 1px 2px rgba(15,27,51,.04),0 8px 28px rgba(37,99,235,.08);
  --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%}
.wrap{width:100%;max-width:1080px;margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:rgba(245,248,253,.88);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.2rem;letter-spacing:-.02em;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand svg{width:30px;height:30px}
.brand b{color:var(--blue)}
.nav{display:flex;gap:4px;align-items:center}
.nav a{color:var(--muted);font-weight:600;font-size:.95rem;padding:8px 12px;border-radius:10px}
.nav a:hover{background:var(--blue-l);color:var(--blue);text-decoration:none}
.nav a.active{color:var(--blue);background:var(--blue-l)}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:10px;width:42px;height:42px;cursor:pointer;color:var(--ink)}
.menu-btn svg{width:22px;height:22px}

/* hero / test */
.hero{padding:44px 0 20px;text-align:center}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);background:var(--blue-l);padding:6px 12px;border-radius:99px}
h1{font-size:clamp(2rem,5vw,3.2rem);line-height:1.1;letter-spacing:-.03em;margin:16px 0 12px}
.lead{max-width:640px;margin:0 auto;color:var(--muted);font-size:1.1rem}
.tester{margin:34px auto 0;max-width:760px;background:var(--surface);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:28px 24px 26px}
.gauge-box{position:relative;max-width:420px;margin:0 auto}
.gauge{width:100%;height:auto;display:block}
.gauge .track{fill:none;stroke:#e6edf8;stroke-width:16;stroke-linecap:round}
.gauge .prog{fill:none;stroke:url(#gg);stroke-width:16;stroke-linecap:round;stroke-dasharray:377;stroke-dashoffset:377}
.gauge .tick{font-size:10px;fill:#8a97b2;font-family:var(--mono)}
.needle{transform-origin:140px 140px;transform:rotate(-90deg);transition:transform .12s linear}
.readout{text-align:center;margin-top:4px}
[hidden]{display:none!important}
.tabs{display:inline-flex;background:var(--bg);border:1px solid var(--line);border-radius:99px;padding:4px;margin-bottom:22px}
.tab{border:0;background:none;padding:9px 22px;border-radius:99px;font:inherit;font-weight:700;color:var(--muted);cursor:pointer}
.tab:hover{color:var(--blue)}
.tab.active{background:var(--blue);color:#fff}
.player{position:relative;aspect-ratio:16/9;max-width:520px;margin:0 auto;border-radius:16px;overflow:hidden;background:linear-gradient(135deg,#0f1b33,#1e3a8a 60%,#0e7490);color:#fff;box-shadow:0 8px 24px rgba(15,27,51,.18)}
.pl-badge{position:absolute;top:12px;right:12px;background:rgba(255,255,255,.18);padding:4px 10px;border-radius:8px;font-weight:800;font-size:.85rem}
.pl-center{position:absolute;inset:0;display:grid;place-items:center}
.pl-center svg{width:64px;height:64px}
.pl-center.spin svg{animation:sp 1s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.pl-wave{position:absolute;left:0;right:0;bottom:52px;height:46px;display:flex;align-items:flex-end;gap:3px;padding:0 16px;opacity:.3}
.pl-wave i{flex:1;background:#fff;border-radius:2px;height:20%;animation:wv 1.1s ease-in-out infinite;animation-play-state:paused}
.player.run .pl-wave i{animation-play-state:running}
@keyframes wv{0%,100%{height:15%}50%{height:90%}}
.pl-bar{position:absolute;left:16px;right:16px;bottom:34px;height:5px;background:rgba(255,255,255,.25);border-radius:5px;overflow:hidden}
.pl-buf{position:absolute;top:0;bottom:0;left:0;width:0;background:rgba(255,255,255,.45)}
.pl-play{position:absolute;top:0;bottom:0;left:0;width:0;background:#fff}
.pl-info{position:absolute;left:16px;right:16px;bottom:10px;display:flex;justify-content:space-between;font-size:.8rem;font-weight:600}
.verdict{margin-top:16px;min-height:1.4em;font-weight:600;color:var(--ink)}
#panel-video .go{margin-top:12px}
.readout .num{font-size:3rem;font-weight:800;letter-spacing:-.03em;line-height:1;font-variant-numeric:tabular-nums}
.readout .unit{color:var(--muted);font-weight:600;font-size:.9rem}
.phase{margin-top:10px;min-height:1.5em;color:var(--muted);font-weight:600}
.go{margin:16px auto 0;display:inline-flex;align-items:center;justify-content:center;gap:10px;background:var(--blue);color:#fff;border:0;border-radius:99px;padding:14px 38px;font-size:1.05rem;font-weight:800;letter-spacing:.02em;cursor:pointer;box-shadow:0 6px 18px rgba(37,99,235,.35);transition:.15s}
.go:hover{background:var(--blue-d);transform:translateY(-1px)}
.go:disabled{opacity:.6;cursor:progress;transform:none}
.results{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:26px}
.res{background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:14px 10px}
.res small{display:block;color:var(--muted);font-weight:700;font-size:.72rem;letter-spacing:.07em;text-transform:uppercase}
.res strong{font-size:1.5rem;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.res span{color:var(--muted);font-size:.8rem;font-weight:600}
.meta-row{display:flex;flex-wrap:wrap;gap:8px 22px;justify-content:center;margin-top:18px;color:var(--muted);font-size:.9rem}
.meta-row i{font-style:normal;color:var(--ink);font-weight:600}

/* sections */
section{padding:56px 0}
h2{font-size:clamp(1.5rem,3vw,2.1rem);letter-spacing:-.02em;margin:0 0 10px}
h3{margin:0 0 6px;font-size:1.1rem}
.sub{color:var(--muted);max-width:620px;margin:0 0 30px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 1px 2px rgba(15,27,51,.03)}
.card p{margin:0;color:var(--muted)}
.ico{width:42px;height:42px;border-radius:12px;background:var(--blue-l);color:var(--blue);display:grid;place-items:center;margin-bottom:12px}
.ico svg{width:22px;height:22px}
.band{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;text-align:center}
.stats strong{display:block;font-size:2rem;letter-spacing:-.03em;color:var(--blue)}
.stats span{color:var(--muted);font-size:.9rem}

/* history */
table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:.95rem}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
th{background:var(--bg);color:var(--muted);font-size:.75rem;letter-spacing:.07em;text-transform:uppercase}
tr:last-child td{border-bottom:0}
td.empty{text-align:center;color:var(--muted)}

/* page heads, prose */
.page-head{padding:50px 0 10px}
.page-head h1{font-size:clamp(1.9rem,4vw,2.7rem);margin:12px 0 8px}
.prose{max-width:760px}
.prose h2{margin-top:34px;font-size:1.4rem}
.prose p,.prose li{color:#34425f}
details{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin-bottom:10px}
summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--blue);font-size:1.3rem;line-height:1}
details[open] summary::after{content:"–"}
details p{margin:10px 0 0;color:var(--muted)}
.code{background:#0f1b33;color:#d6e4ff;border-radius:14px;padding:18px 20px;font-family:var(--mono);font-size:.85rem;overflow:auto;line-height:1.6}
.code .k{color:#7fb0ff}.code .s{color:#8be9c4}
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.plan{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.plan.hot{border-color:var(--blue);box-shadow:var(--shadow)}
.plan .price{font-size:2rem;font-weight:800;letter-spacing:-.03em;margin:8px 0}
.plan .price small{font-size:.95rem;color:var(--muted);font-weight:600}
.plan ul{padding-left:18px;color:var(--muted);margin:12px 0 18px}
.btn{display:inline-block;background:var(--blue);color:#fff;border-radius:12px;padding:11px 20px;font-weight:700;border:0;cursor:pointer;font-size:1rem;font-family:inherit}
.btn:hover{background:var(--blue-d);text-decoration:none}
.btn.ghost{background:var(--blue-l);color:var(--blue)}
form{display:grid;gap:14px;max-width:560px}
label{font-weight:600;font-size:.9rem;display:grid;gap:6px}
input,textarea,select{font:inherit;border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fff;color:var(--ink)}
input:focus,textarea:focus,select:focus{outline:2px solid var(--blue);outline-offset:1px;border-color:transparent}
.ok{display:none;background:#e7f8ef;border:1px solid #b6e7cb;color:#116b3b;border-radius:12px;padding:12px 14px;font-weight:600}

/* footer */
.site-footer{margin-top:30px;background:#0f1b33;color:#aebbd6;padding:46px 0 26px;font-size:.92rem}
.site-footer a{color:#cfdcf5}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}
.site-footer h4{color:#fff;margin:0 0 10px;font-size:.9rem}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.copy{border-top:1px solid #243457;margin-top:30px;padding-top:18px;display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;color:#8393b3;font-size:.85rem}

@media(max-width:860px){
  .grid3,.plans{grid-template-columns:1fr}
  .grid2{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .fgrid{grid-template-columns:1fr 1fr}
  .results{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:720px){
  .menu-btn{display:grid;place-items:center}
  .nav{display:none;position:absolute;left:0;right:0;top:64px;flex-direction:column;align-items:stretch;background:var(--bg);border-bottom:1px solid var(--line);padding:10px 16px 16px}
  .nav.open{display:flex}
  .readout .num{font-size:2.3rem}
  .fgrid{grid-template-columns:1fr}
  th,td{padding:10px 8px;font-size:.85rem}
}

/* language switch */
.lang-sw{display:inline-flex;border:1px solid var(--line);border-radius:99px;overflow:hidden;margin-left:8px;background:var(--surface)}
.lang-sw a{padding:6px 11px;font-size:.78rem;font-weight:800;letter-spacing:.04em;color:var(--muted);border-radius:0}
.lang-sw a:hover{background:var(--blue-l);color:var(--blue);text-decoration:none}
.lang-sw a.on{background:var(--blue);color:#fff}

/* streaming test controls */
.vctl{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}
.vctl label{font-weight:700;color:var(--muted);font-size:.95rem}
.vctl select{font:inherit;font-weight:700;border:1px solid var(--line);border-radius:12px;padding:10px 14px;background:#fff;color:var(--ink);cursor:pointer;min-width:170px}
.vctl select:disabled{opacity:.6;cursor:not-allowed}
.vnote{color:var(--muted);font-size:.85rem;margin:8px auto 16px;max-width:520px}
.pl-info{align-items:center}
.pl-info span:nth-child(2){font-variant-numeric:tabular-nums;opacity:.95}
.vchart-box{max-width:520px;margin:14px auto 0;text-align:left}
.vchart-title{font-size:.72rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.vchart{width:100%;height:90px;display:block;background:var(--bg);border:1px solid var(--line);border-radius:12px}
.vchart .gl{stroke:#cfd9ea;stroke-width:1}
.vchart .gl.d{stroke-dasharray:3 4;stroke:#dde5f2}
.vchart .vl{fill:none;stroke:var(--blue);stroke-width:2;stroke-linejoin:round;vector-effect:non-scaling-stroke}
.vchart .va{fill:rgba(37,99,235,.12);stroke:none}
.vaxis{display:flex;justify-content:space-between;font-size:.72rem;color:var(--muted);font-variant-numeric:tabular-nums;margin-top:3px}
.results.r2{margin-top:12px}
.go.stop{background:#475569;box-shadow:0 6px 18px rgba(71,85,105,.3)}
.go.stop:hover{background:#334155}
@media(max-width:720px){.lang-sw{margin:8px 0 0;align-self:flex-start}}