/* Cat6 Cabling — modern, lightweight, responsive stylesheet (image-light) */
:root{
  --blue:#1d4ed8; --blue-700:#1e40af; --blue-50:#eff6ff;
  --cyan:#0891b2; --ink:#0f172a; --slate:#334155; --muted:#64748b;
  --line:#e2e8f0; --bg:#ffffff; --bg-soft:#f8fafc; --bg-alt:#f1f5f9;
  --ok:#047857; --warn:#b45309;
  --radius:14px; --radius-sm:10px; --shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.06);
  --maxw:1120px; --prose:760px;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.65;font-size:17px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.2;color:var(--ink);font-weight:750;letter-spacing:-.02em}
h1{font-size:2.1rem;margin:.2em 0 .4em}
h2{font-size:1.5rem;margin:1.8em 0 .5em}
h3{font-size:1.18rem;margin:1.5em 0 .4em}
p{margin:0 0 1.05em}
ul,ol{margin:0 0 1.1em;padding-left:1.3em}
li{margin:.3em 0}
hr{border:none;border-top:1px solid var(--line);margin:2em 0}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
.center{text-align:center}

/* Header */
.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:18px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;letter-spacing:-.02em;color:var(--ink);margin-right:auto}
.brand:hover{text-decoration:none}
.brand .logo{width:34px;height:34px;flex:0 0 auto}
.brand b{color:var(--blue)}
.nav-links{display:flex;align-items:center;gap:22px;list-style:none;margin:0;padding:0}
.nav-links a{color:var(--slate);font-weight:600;font-size:.97rem}
.nav-links a:hover,.nav-links a.active{color:var(--blue);text-decoration:none}
.nav-cta{display:inline-flex}
.menu-toggle{display:none}
.hamburger{display:none}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:.5em;padding:.7em 1.15em;border-radius:999px;font-weight:700;font-size:.97rem;border:1px solid transparent;cursor:pointer;transition:transform .05s ease, box-shadow .2s ease}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 6px 18px rgba(29,78,216,.25)}
.btn-primary:hover{background:var(--blue-700)}
.btn-outline{background:#fff;color:var(--blue);border-color:#cdd9f5}
.btn-ghost{background:var(--blue-50);color:var(--blue-700)}
.btn-lg{padding:.85em 1.5em;font-size:1.02rem}

/* Hero */
.hero{background:radial-gradient(1200px 400px at 80% -10%,rgba(8,145,178,.16),transparent),linear-gradient(180deg,#0b1220,#111c34);color:#e8eefb;padding:72px 0 64px}
.hero h1{color:#fff;font-size:2.6rem;max-width:16ch}
.hero p{color:#c4d0ea;font-size:1.18rem;max-width:60ch;margin-bottom:1.5em}
.hero .btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.hero .eyebrow{color:#7cc7e4}
.eyebrow{display:inline-block;font-weight:750;font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan);margin-bottom:.6em}

/* Sections */
.section{padding:64px 0}
.section-soft{background:var(--bg-soft)}
.section-alt{background:var(--bg-alt)}
.section h2{font-size:1.9rem}
.lead{font-size:1.15rem;color:var(--slate);max-width:65ch}
.section-head{max-width:65ch;margin-bottom:36px}

/* Grid + cards */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:border-color .2s,transform .2s}
.card:hover{border-color:#c7d2fe;transform:translateY(-2px)}
.card h3{margin-top:.2em}
.card p{color:var(--slate);margin-bottom:.6em}
.card .more{font-weight:700}
.icon{width:44px;height:44px;border-radius:11px;display:grid;place-items:center;background:var(--blue-50);color:var(--blue);margin-bottom:14px}
.icon svg{width:24px;height:24px}
.tag{display:inline-block;font-size:.75rem;font-weight:700;color:var(--cyan);background:#ecfeff;border:1px solid #cffafe;padding:.2em .6em;border-radius:999px;margin-bottom:10px}

/* Prose / article */
.page{padding:42px 0 64px}
.prose{max-width:var(--prose);margin:0 auto}
.prose p,.prose li{color:#1f2937}
.prose h2{border-top:1px solid var(--line);padding-top:.9em}
.prose img{border-radius:var(--radius-sm);border:1px solid var(--line);margin:1.2em 0}
.prose blockquote{margin:1.4em 0;padding:.4em 1.2em;border-left:4px solid var(--blue);background:var(--bg-soft);color:var(--slate);border-radius:0 8px 8px 0}
.prose table{width:100%;border-collapse:collapse;margin:1.3em 0;font-size:.96rem}
.prose th,.prose td{border:1px solid var(--line);padding:.6em .7em;text-align:left;vertical-align:top}
.prose thead th{background:var(--bg-alt);font-weight:700}
.prose tbody tr:nth-child(even){background:var(--bg-soft)}

/* Breadcrumbs */
.crumbs{font-size:.85rem;color:var(--muted);margin:0 auto 14px;max-width:var(--prose)}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--blue)}
.crumbs span{margin:0 .4em}
.post-meta{max-width:var(--prose);margin:0 auto 8px;color:var(--muted);font-size:.9rem}

/* Callout: recommended installer */
.callout{max-width:var(--prose);margin:2.4em auto 0;background:linear-gradient(180deg,#f0f7ff,#eef2ff);border:1px solid #d6e0fb;border-radius:var(--radius);padding:24px 26px}
.callout h3{margin:.1em 0 .35em}
.callout p{color:var(--slate);margin-bottom:1em}
.callout .btn{margin-top:.2em}
.callout .loc{font-size:.85rem;color:var(--muted);margin-top:.8em;margin-bottom:0}

/* Related guides */
.related{max-width:var(--prose);margin:2.4em auto 0;border-top:1px solid var(--line);padding-top:1.2em}
.related h2{font-size:1.15rem;border:none;padding:0;margin:.2em 0 .6em}
.related ul{list-style:none;padding:0;margin:0}
.related li{margin:.45em 0}
.related a{font-weight:600}

/* FAQ */
.faq{max-width:var(--prose);margin:0 auto}
.faq h3{font-size:1.08rem}

/* CTA band */
.cta-band{background:linear-gradient(120deg,var(--blue),#3056d3);color:#fff;border-radius:18px;padding:40px;text-align:center;margin:8px 0}
.cta-band h2{color:#fff;margin-top:0}
.cta-band p{color:#dbe4ff;max-width:60ch;margin:0 auto 1.3em}
.cta-band .btn-primary{background:#fff;color:var(--blue-700)}

/* Lists with checks */
.checks{list-style:none;padding:0}
.checks li{position:relative;padding-left:1.7em;margin:.5em 0}
.checks li::before{content:"";position:absolute;left:0;top:.45em;width:1.05em;height:1.05em;background:var(--blue-50);border-radius:50%}
.checks li::after{content:"";position:absolute;left:.33em;top:.62em;width:.32em;height:.55em;border:2px solid var(--blue);border-top:0;border-left:0;transform:rotate(45deg)}

/* Footer */
.site-footer{background:#0b1220;color:#aab6cf;padding:54px 0 30px;margin-top:40px;font-size:.95rem}
.site-footer a{color:#cdd8ef}
.site-footer a:hover{color:#fff}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
.site-footer h4{color:#fff;font-size:.95rem;margin:0 0 .8em;letter-spacing:.02em}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:.4em 0}
.foot-brand .brand{color:#fff;margin-bottom:.6em}
.foot-brand p{color:#8595b4;max-width:34ch}
.foot-bottom{border-top:1px solid #1e293b;padding-top:18px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:#7587a6;font-size:.86rem}
.foot-bottom .partner b{color:#cdd8ef}

@media (max-width:880px){
  .grid-3{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .hero h1{font-size:2.1rem}
}
@media (max-width:640px){
  body{font-size:16px}
  h1{font-size:1.7rem}.hero h1{font-size:1.8rem}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none;position:absolute;top:66px;left:0;right:0;flex-direction:column;background:#fff;border-bottom:1px solid var(--line);padding:14px 20px;gap:6px;box-shadow:var(--shadow)}
  .nav-links a{display:block;padding:8px 0}
  .menu-toggle:checked ~ .nav-links{display:flex}
  .hamburger{display:inline-grid;place-items:center;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;cursor:pointer}
  .hamburger span,.hamburger span::before,.hamburger span::after{content:"";display:block;width:20px;height:2px;background:var(--ink);position:relative}
  .hamburger span::before{position:absolute;top:-6px}
  .hamburger span::after{position:absolute;top:6px}
  .nav-cta{display:none}
  .cta-band,.callout{padding:24px}
}