:root{--bg:#060d1a;--bg2:#0a1424;--panel:#0e1b30;--line:#1c3150;--cy:#22d3ee;--bl:#3b82f6;--tx:#e8eef7;--mu:#9fb0c8;--r:8px}
:root[data-theme=light]{--bg:#f4f7fb;--bg2:#e9eff7;--panel:#fff;--line:#c9d6e6;--tx:#0a1424;--mu:#44566f;--cy:#0369a1}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--tx);font:16px/1.65 "Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif}
img,svg{max-width:100%}a{color:var(--cy)}
:focus-visible{outline:3px solid var(--cy);outline-offset:2px}
.wrap{width:min(1180px,100% - 2.5rem);margin:auto}
.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;background:var(--cy);color:#000;padding:.5rem 1rem;z-index:99}
header.nav{position:sticky;top:0;z-index:50;background:rgba(6,13,26,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:68px}
.logo{font-weight:800;letter-spacing:.08em;color:#fff;text-decoration:none;font-size:1.05rem}.logo b{color:var(--cy)}
.nav ul{display:flex;gap:1.1rem;list-style:none;margin:0;padding:0}
.nav ul a{color:#cfdbec;text-decoration:none;font-size:.82rem;font-weight:600;letter-spacing:.04em}
.nav ul a:hover,.nav ul a[aria-current]{color:var(--cy)}
.btn{display:inline-block;padding:.8rem 1.4rem;border-radius:var(--r);font-weight:700;font-size:.9rem;text-decoration:none;border:1px solid var(--cy);background:var(--cy);color:#04111f;cursor:pointer;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(34,211,238,.25)}
.btn.ghost{background:transparent;color:var(--cy)}
.burger{display:none;background:none;border:1px solid var(--line);color:#fff;border-radius:var(--r);padding:.5rem .7rem;font-size:1.1rem}
section{padding:4.5rem 0}.alt{background:var(--bg2)}
h1,h2,h3{line-height:1.15;margin:0 0 .8rem}h1{font-size:clamp(2.1rem,5.5vw,4rem);letter-spacing:-.02em}h2{font-size:clamp(1.6rem,3.5vw,2.4rem)}h3{font-size:1.1rem}
p{margin:0 0 1rem;max-width:68ch}.mu{color:var(--mu)}
.hero{padding:5rem 0 4rem;background:radial-gradient(60% 60% at 80% 30%,rgba(59,130,246,.18),transparent),var(--bg)}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:2rem;align-items:center}
.cta{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.4rem}
.grid{display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:1.4rem;transition:transform .2s,border-color .2s}
.card:hover{transform:translateY(-3px);border-color:var(--cy)}
.card ul{padding-left:1.1rem;margin:.5rem 0 0;color:var(--mu);font-size:.92rem}
.tag{display:inline-block;font-size:.72rem;border:1px dashed var(--mu);color:var(--mu);border-radius:99px;padding:.1rem .6rem;margin-bottom:.6rem}
.note{border-left:3px solid var(--cy);background:var(--panel);padding:.9rem 1.2rem;border-radius:0 var(--r) var(--r) 0;color:var(--mu);margin-top:1.4rem}
.steps{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));counter-reset:s;position:relative}
.steps li{list-style:none;counter-increment:s;background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:1.1rem}
.steps li:before{content:counter(s,decimal-leading-zero);display:block;color:var(--cy);font-weight:800;font-size:1.4rem}
.steps ol,ol.steps{padding:0;margin:0}
.quote{font-size:clamp(1.5rem,4vw,2.6rem);font-weight:800;line-height:1.2;border-left:4px solid var(--cy);padding-left:1.2rem;max-width:22ch}
form{display:grid;gap:1rem;grid-template-columns:1fr 1fr}form .full{grid-column:1/-1}
label{display:block;font-size:.85rem;font-weight:600;margin-bottom:.3rem}
input,select,textarea{width:100%;padding:.75rem;background:var(--bg);color:var(--tx);border:1px solid var(--line);border-radius:var(--r);font:inherit}
.fibre{stroke:var(--cy);stroke-width:2;fill:none;stroke-dasharray:6 14;animation:flow 2.4s linear infinite}
@keyframes flow{to{stroke-dashoffset:-20}}
.net text{fill:var(--tx);font-size:12px}.net .nd{fill:var(--panel);stroke:var(--cy);stroke-width:2;cursor:pointer;transition:fill .2s}.net .nd:hover,.net .nd.on{fill:var(--cy)}
#nodeinfo{min-height:3.2rem;color:var(--mu);margin-top:.8rem}
.rv{opacity:0;transform:translateY(14px);transition:.6s}.rv.in{opacity:1;transform:none}
footer{background:#040912;border-top:1px solid var(--line);padding:3rem 0 1.5rem;color:#9fb0c8;font-size:.9rem}
footer .grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}footer ul{list-style:none;padding:0;margin:0}footer a{color:#cfdbec;text-decoration:none}footer h3{color:#fff;font-size:.95rem}
.ph{color:#fbbf24}
@media(max-width:900px){.hero .wrap{grid-template-columns:1fr}.burger{display:block}
.nav ul{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;background:var(--bg);padding:1rem 1.5rem;border-bottom:1px solid var(--line);gap:.9rem}
.nav ul.open{display:flex}.nav .btn.q{display:none}form{grid-template-columns:1fr}.cta .btn{width:100%;text-align:center}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}.rv{opacity:1;transform:none}}