/* BroadbandGauge — shared styles for informational pages (light theme,
   harmonised with the self-contained homepage in index.html). */
:root{
  --bg:#f6f9fe; --bg2:#eef4fc; --surface:#fff; --ink:#0f1b2d; --ink2:#42526b; --ink3:#7587a0;
  --line:#e3eaf4; --line2:#d3deec; --brand:#1f8efa; --brand-deep:#0a6cd6; --accent2:#19d3e0;
  --up:#7c5cff; --ok:#1bbf73; --warn:#d97706; --radius:18px; --shadow:0 6px 24px rgba(20,80,160,.10);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;color:var(--ink);
  font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,sans-serif;
  background:
    radial-gradient(1100px 540px at 50% -8%, #eaf4ff 0%, rgba(234,244,255,0) 60%),
    linear-gradient(180deg,var(--bg) 0%, var(--bg2) 100%);
  background-attachment:fixed;min-height:100vh;-webkit-font-smoothing:antialiased;
}
a{color:var(--brand-deep);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid rgba(31,142,250,.5);outline-offset:3px;border-radius:6px}
.container{max-width:1000px;margin:0 auto;padding:0 22px}

/* Header / nav */
.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.8);
  backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:66px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;font-size:1.16rem;letter-spacing:-.02em}
.brand:hover{text-decoration:none}
.brand .dot{width:32px;height:32px;border-radius:10px;
  background:linear-gradient(135deg,var(--brand),var(--accent2));box-shadow:0 6px 16px rgba(25,150,230,.35)}
.nav-links{display:flex;gap:4px;flex-wrap:wrap}
.nav-links a{color:var(--ink2);font-weight:600;font-size:.94rem;padding:8px 13px;border-radius:10px}
.nav-links a:hover{background:var(--bg2);color:var(--ink);text-decoration:none}

/* Layout */
.hero{padding:18px 0 6px}
.hero h1{font-size:clamp(1.7rem,4vw,2.4rem);letter-spacing:-.03em;margin:.2em 0 .3em;font-weight:850}
.hero p{color:var(--ink2);max-width:60ch;margin:0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:28px;margin:18px 0}
.page{padding:24px 0 50px}
h2{font-size:1.3rem;letter-spacing:-.01em}
h3{margin:.2em 0}
.muted{color:var(--ink3)} .small{font-size:.85rem}
ul{padding-left:1.2em} li{margin:.2em 0}

.kv{display:grid;grid-template-columns:max-content 1fr;gap:8px 18px}
.kv dt{color:var(--ink3)} .kv dd{margin:0;font-weight:600;overflow-wrap:anywhere}

.notice{border-left:4px solid var(--warn);background:#fffbeb;padding:12px 14px;border-radius:8px;font-size:.92rem;margin:14px 0}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.tile{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow)}

.site-footer{padding:30px 0;color:var(--ink3);font-size:.9rem;border-top:1px solid var(--line);margin-top:10px}
.site-footer .nav-links a{color:var(--ink3)}

@media (max-width:640px){ .nav{flex-direction:column;align-items:flex-start;gap:10px} }
@media (prefers-reduced-motion:reduce){*{transition:none!important}}