/* CALIX — Calabria Internet eXchange · design system v2
   Tema chiaro istituzionale, identità blu. Dark via prefers-color-scheme. */
:root{
  --ink:#0b1220; --bg:#ffffff; --surface:#f5f8fc; --surface2:#eaf1fb; --line:#dbe6f3; --muted:#56637a; --ink-soft:#243047;
  --primary:#2563eb; --primary-deep:#1e40af; --primary-700:#1d4ed8; --cyan:#38bdf8; --cyan-deep:#0ea5e9;
  --accent:#f59e0b; --ok:#16a34a; --err:#dc2626;
  --navy:#0a1430; --navy-2:#0e1c44; --navy-ink:#eaf1ff; --navy-muted:#9db2da; --navy-line:#1e2d57;
  --maxw:1180px; --gut:clamp(20px,5vw,56px); --r:18px; --r-sm:12px; --r-xs:8px;
  --shadow-sm:0 1px 2px rgba(11,18,32,.06), 0 2px 8px -4px rgba(11,18,32,.12);
  --shadow:0 2px 4px rgba(11,18,32,.05), 0 20px 48px -28px rgba(11,18,32,.3);
  --shadow-lg:0 4px 10px rgba(10,20,48,.1), 0 48px 90px -36px rgba(10,20,48,.55);
  --ring:0 0 0 2px var(--bg), 0 0 0 4px var(--primary);
  --fd:"Space Grotesk",system-ui,sans-serif; --fb:"Inter",system-ui,sans-serif; --fm:"JetBrains Mono",ui-monospace,monospace;
}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --ink:#e8eefb; --bg:#080d1a; --surface:#0d1528; --surface2:#0f1a35; --line:#1d2a48; --muted:#93a4c6; --ink-soft:#c7d4ee;
  --primary:#60a5fa; --primary-deep:#3b82f6; --primary-700:#60a5fa; --ok:#4ade80;
  --navy:#060b18; --navy-2:#0b1430; --navy-line:#192a52;
  --shadow-sm:0 1px 2px rgba(0,0,0,.4);
  --shadow:0 2px 6px rgba(0,0,0,.4),0 24px 60px -30px rgba(0,0,0,.75);
  --shadow-lg:0 4px 12px rgba(0,0,0,.5),0 60px 110px -40px rgba(0,0,0,.85);
}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--fb);font-size:17px;line-height:1.62;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gut)}
.wrap-wide{max-width:1320px}
h1,h2,h3,h4{font-family:var(--fd);font-weight:700;line-height:1.07;letter-spacing:-.022em;margin:0;text-wrap:balance}
h2{font-size:clamp(28px,4vw,42px)}
h3{font-size:20px}
p{margin:0}
a{color:var(--primary-700);text-decoration:none}
a:hover{text-decoration:underline}
.eyebrow{display:inline-block;font-family:var(--fm);font-size:12.5px;letter-spacing:.17em;text-transform:uppercase;color:var(--primary-700)}
:root[data-theme="dark"] .eyebrow,:root:not([data-theme="light"]) .eyebrow{color:var(--cyan)}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]) .eyebrow{color:var(--cyan)}}
.mono{font-family:var(--fm)}
.tbd{font-family:var(--fm);font-size:.82em;color:var(--accent);background:color-mix(in srgb,var(--accent) 14%,transparent);padding:1px 7px;border-radius:5px;white-space:nowrap}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:.5em;font-family:var(--fb);font-weight:600;font-size:16px;padding:13px 24px;border-radius:999px;border:1px solid transparent;cursor:pointer;transition:transform .15s ease,background .15s,box-shadow .15s}
.btn:hover{text-decoration:none;transform:translateY(-1.5px)}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 8px 20px -8px color-mix(in srgb,var(--primary) 70%,transparent)}
.btn-primary:hover{background:var(--primary-700);box-shadow:0 12px 26px -8px color-mix(in srgb,var(--primary) 75%,transparent)}
.btn-ghost{background:transparent;color:inherit;border-color:var(--line)} .btn-ghost:hover{border-color:var(--primary)}
.btn-white{background:#fff;color:var(--navy)} .btn-white:hover{background:#eef4ff}
.btn-lg{padding:15px 30px;font-size:17px}
:focus-visible{outline:2px solid transparent;outline-offset:2px;box-shadow:var(--ring)}

section{padding-block:clamp(54px,7vw,92px)}
.sec-head{max-width:64ch}.sec-head h2{margin-top:12px}.sec-head .sub{color:var(--muted);font-size:18px;margin-top:14px}
.center{text-align:center;margin-inline:auto}
.alt{background:var(--surface);border-block:1px solid var(--line)}

/* Utility top strip */
.ustrip{background:var(--navy);color:var(--navy-muted);font-size:12.5px}
.ustrip .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;padding-block:7px}
.ustrip a{color:var(--navy-muted);font-family:var(--fm);letter-spacing:.03em}
.ustrip a:hover{color:#fff;text-decoration:none}
.ustrip .u-r{display:flex;gap:18px;align-items:center}
.ustrip .u-dot{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 3px rgba(56,189,248,.2);display:inline-block;margin-right:6px;vertical-align:middle}

/* Header */
header.site{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:14px}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--fd);font-weight:700;font-size:23px;letter-spacing:.01em;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand .mk{width:34px;height:34px;flex:none}
.brand small{display:block;font-family:var(--fb);font-weight:500;font-size:11px;color:var(--muted);letter-spacing:.03em;margin-top:1px}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{color:var(--ink-soft);font-weight:500;font-size:15px;position:relative}
.nav-links a:not(.navcta):hover{color:var(--primary-700);text-decoration:none}
.nav-links a.active:not(.navcta){color:var(--primary-700)}
.nav-links a.active:not(.navcta)::after{content:"";position:absolute;left:0;right:0;bottom:-18px;height:2px;background:var(--primary)}
@media(max-width:900px){.nav-links a:not(.navcta){display:none}}

/* HERO */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);
  background:
    radial-gradient(1200px 520px at 88% -8%, color-mix(in srgb,var(--cyan) 22%,transparent) 0%, transparent 55%),
    radial-gradient(900px 500px at 8% 10%, color-mix(in srgb,var(--primary) 12%,transparent) 0%, transparent 50%),
    var(--bg)}
.hero::before{content:"";position:absolute;inset:0;opacity:.6;pointer-events:none;
  background-image:radial-gradient(circle at 1px 1px, color-mix(in srgb,var(--primary) 26%,transparent) 1px, transparent 0);background-size:30px 30px;
  mask:radial-gradient(75% 75% at 85% 15%, #000, transparent 75%)}
.hero .wrap{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding-block:clamp(44px,6vw,80px)}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr;gap:28px}}
.pill{display:inline-flex;align-items:center;gap:9px;padding:7px 15px;border-radius:999px;background:color-mix(in srgb,var(--bg) 70%,transparent);border:1px solid var(--line);font-family:var(--fm);font-size:12px;letter-spacing:.06em;color:var(--muted);box-shadow:var(--shadow-sm)}
.pill .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 4px rgba(56,189,248,.18)}
.hero h1{font-size:clamp(35px,5.6vw,60px);margin-top:20px;max-width:16ch;color:var(--ink)}
.hero h1 .hl{color:var(--primary);position:relative}
.hero .lead{font-size:clamp(17px,2.1vw,21px);color:var(--ink-soft);max-width:54ch;margin-top:20px}
.hero-cta{display:flex;flex-wrap:wrap;gap:13px;margin-top:30px}
.hero-trust{display:flex;flex-wrap:wrap;align-items:center;gap:18px;margin-top:30px;color:var(--muted);font-size:13.5px}
.hero-trust b{color:var(--ink)}
.hero-trust .sep{width:1px;height:18px;background:var(--line)}

/* Hero network illustration */
.netfig{position:relative;aspect-ratio:1/.92;width:100%}
.netfig svg{width:100%;height:100%;overflow:visible}
.netfig .edge{stroke:url(#calixEdge);stroke-width:1.6;fill:none;opacity:.55}
.netfig .flow{stroke:var(--cyan);stroke-width:2.2;fill:none;stroke-linecap:round;stroke-dasharray:4 12;opacity:.9;animation:dash 2.2s linear infinite}
@keyframes dash{to{stroke-dashoffset:-32}}
.netfig .peer{fill:var(--bg);stroke:var(--line);stroke-width:1.5}
.netfig .peer-core{fill:color-mix(in srgb,var(--primary) 14%,var(--bg));stroke:var(--primary);stroke-width:2}
.netfig .chip{fill:color-mix(in srgb,var(--bg) 88%,transparent);stroke:var(--line);stroke-width:1}
.netfig .chip-t{font-family:var(--fm);font-size:10.5px;fill:var(--muted)}
.netfig .node-pulse{fill:var(--cyan);opacity:.25;animation:pulse 2.6s ease-out infinite}
@keyframes pulse{0%{transform:scale(.6);opacity:.45}70%{opacity:0}100%{transform:scale(2.4);opacity:0}}
@media(prefers-reduced-motion:reduce){.netfig .flow,.netfig .node-pulse{animation:none}}

/* STATS BAND */
.statsband{background:var(--navy);color:var(--navy-ink);position:relative;overflow:hidden}
.statsband::before{content:"";position:absolute;inset:0;opacity:.5;
  background:radial-gradient(700px 300px at 85% 0%, color-mix(in srgb,var(--cyan) 30%,transparent), transparent 60%)}
.statsband .wrap{position:relative;z-index:1;padding-block:clamp(34px,4vw,52px)}
.statgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
@media(max-width:860px){.statgrid{grid-template-columns:repeat(2,1fr);gap:26px}}
@media(max-width:460px){.statgrid{grid-template-columns:1fr 1fr}}
.stat{display:flex;gap:14px;align-items:flex-start}
.stat .si{flex:none;width:42px;height:42px;border-radius:12px;display:grid;place-items:center;color:var(--cyan);background:color-mix(in srgb,var(--cyan) 14%,transparent);border:1px solid var(--navy-line)}
.stat b{font-family:var(--fd);font-weight:700;font-size:clamp(20px,2.4vw,27px);display:block;line-height:1.1;color:#fff}
.stat span{font-size:13px;color:var(--navy-muted)}

/* Cards / features */
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:44px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:44px}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:44px}
.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--r);padding:26px;box-shadow:var(--shadow-sm);transition:transform .18s,box-shadow .18s,border-color .18s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:color-mix(in srgb,var(--primary) 30%,var(--line))}
.card .ic{width:46px;height:46px;border-radius:13px;background:linear-gradient(135deg,color-mix(in srgb,var(--primary) 16%,transparent),color-mix(in srgb,var(--cyan) 16%,transparent));color:var(--primary-700);display:grid;place-items:center;margin-bottom:16px}
:root[data-theme="dark"] .card .ic,:root:not([data-theme="light"]) .card .ic{color:var(--cyan)}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]) .card .ic{color:var(--cyan)}}
.card h3{margin-bottom:8px;font-size:18px}.card p{color:var(--muted);font-size:14.5px}

/* Steps with connector */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:44px;position:relative}
.step{border:1px solid var(--line);border-radius:var(--r);padding:26px;background:var(--bg);box-shadow:var(--shadow-sm);position:relative}
.step .n{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:10px;font-family:var(--fm);font-weight:500;font-size:15px;color:#fff;background:var(--primary);margin-bottom:14px}
.step h3{font-size:18px;margin-bottom:7px}.step p{color:var(--muted);font-size:14.5px}

/* Tech table */
.tech{display:grid;grid-template-columns:repeat(2,1fr);gap:0;margin-top:44px;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--bg);box-shadow:var(--shadow-sm)}
.tech .row{display:flex;justify-content:space-between;align-items:baseline;gap:16px;padding:17px 24px;border-bottom:1px solid var(--line)}
.tech .row:nth-last-child(-n+1){border-bottom:none}
@media(min-width:700px){.tech .row:nth-last-child(2){border-bottom:none}}
@media(max-width:700px){.tech{grid-template-columns:1fr}}
.tech .k{font-size:14px;color:var(--muted)}
.tech .v{font-family:var(--fm);font-size:14px;color:var(--ink);text-align:right}

/* Neutrality dark band */
.band-dark{background:linear-gradient(180deg,var(--navy),var(--navy-2));color:var(--navy-ink);position:relative;overflow:hidden}
.band-dark::before{content:"";position:absolute;inset:0;opacity:.5;pointer-events:none;
  background-image:radial-gradient(circle at 1px 1px, rgba(255,255,255,.06) 1px, transparent 0);background-size:30px 30px;mask:radial-gradient(60% 80% at 15% 0%,#000,transparent)}
.band-dark .wrap{position:relative;z-index:1}
.band-dark .eyebrow{color:var(--cyan)}
.neutral{display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center}
@media(max-width:820px){.neutral{grid-template-columns:1fr}}
.neutral .big{font-family:var(--fd);font-weight:600;font-size:clamp(22px,2.8vw,30px);line-height:1.3;color:var(--ink)}
.neutral .big .hl{color:var(--primary-deep)}
.band-dark .neutral .big{color:#fff}
.band-dark .neutral .big .hl{color:var(--cyan)}
.byeu{border:1px solid var(--navy-line);border-radius:var(--r);padding:24px;background:color-mix(in srgb,#fff 5%,transparent)}
.byeu .lbl{font-family:var(--fm);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--cyan);margin-bottom:9px}
.byeu p{font-size:14.5px;color:var(--navy-muted)}
.byeu a{color:#fff}

/* Members chips */
.members{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.members .m{font-family:var(--fm);font-size:13px;color:var(--ink-soft);border:1px solid var(--line);border-radius:999px;padding:9px 18px;background:var(--bg);box-shadow:var(--shadow-sm)}

/* CTA */
.cta{background:linear-gradient(135deg,var(--primary-deep),#122a63 60%,#0c1d45);color:#fff;border-radius:calc(var(--r)+6px);padding:clamp(32px,5vw,58px);margin-top:8px;display:grid;grid-template-columns:1.3fr .7fr;gap:30px;align-items:center;position:relative;overflow:hidden;box-shadow:var(--shadow-lg)}
.cta::before{content:"";position:absolute;inset:0;background:radial-gradient(50% 70% at 100% 0%, rgba(56,189,248,.22), transparent 60%);pointer-events:none}
.cta::after{content:"";position:absolute;inset:0;opacity:.5;pointer-events:none;background-image:radial-gradient(circle at 1px 1px, rgba(255,255,255,.07) 1px, transparent 0);background-size:26px 26px;mask:radial-gradient(60% 80% at 10% 100%,#000,transparent)}
.cta>*{position:relative;z-index:1}
.cta h2{color:#fff;margin-bottom:12px}.cta p{color:rgba(255,255,255,.85);font-size:16px;max-width:44ch}
.cta .act{display:flex;flex-direction:column;gap:11px}
.cta .act a.btn{justify-content:center}
@media(max-width:760px){.cta{grid-template-columns:1fr}}

/* Sub-hero (inner pages) */
.subhero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);
  background:radial-gradient(900px 440px at 90% -20%, color-mix(in srgb,var(--cyan) 18%,transparent), transparent 55%), var(--surface)}
.subhero::before{content:"";position:absolute;inset:0;opacity:.55;pointer-events:none;
  background-image:radial-gradient(circle at 1px 1px, color-mix(in srgb,var(--primary) 22%,transparent) 1px, transparent 0);background-size:30px 30px;mask:radial-gradient(60% 80% at 90% 0%, #000, transparent)}
.subhero .wrap{position:relative;z-index:1;padding-block:clamp(40px,6vw,70px)}
.crumb{font-family:var(--fm);font-size:12.5px;letter-spacing:.04em;color:var(--muted)}
.crumb a{color:var(--muted)} .crumb a:hover{color:var(--primary-700)}
.subhero h1{font-size:clamp(30px,4.6vw,48px);margin-top:14px;max-width:20ch;color:var(--ink)}
.subhero h1 .hl{color:var(--primary)}
.subhero .lead{font-size:clamp(16px,2vw,20px);color:var(--ink-soft);max-width:62ch;margin-top:16px}

/* Prose (legal) */
.prose{max-width:76ch;margin-top:8px}
.prose h2{font-size:clamp(21px,3vw,28px);margin-top:42px;margin-bottom:10px}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:18px;margin-top:28px;margin-bottom:6px}
.prose p{color:var(--ink-soft);font-size:16px;margin-top:12px}
.prose ul{color:var(--ink-soft);font-size:16px;margin-top:12px;padding-left:22px}
.prose li{margin-top:6px}
.prose .updated{font-family:var(--fm);font-size:12.5px;color:var(--muted);letter-spacing:.03em}
.callout{border:1px solid var(--line);border-left:3px solid var(--accent);background:color-mix(in srgb,var(--accent) 7%,transparent);border-radius:var(--r-sm);padding:16px 20px;margin-top:20px;font-size:14.5px;color:var(--ink-soft)}
.callout strong{color:var(--ink)}

/* Contact */
.contact{display:grid;grid-template-columns:1.1fr .9fr;gap:34px;margin-top:44px;align-items:start}
@media(max-width:820px){.contact{grid-template-columns:1fr}}
.cbox{border:1px solid var(--line);border-radius:var(--r);padding:26px;background:var(--bg);box-shadow:var(--shadow-sm)}
.cbox .lbl{font-family:var(--fm);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.cbox .big{font-family:var(--fd);font-weight:600;font-size:19px;color:var(--ink)}
.cbox p{color:var(--ink-soft);font-size:14.5px;margin-top:4px}
.clist{list-style:none;margin:0;padding:0}
.clist li{display:flex;justify-content:space-between;gap:14px;padding:13px 0;border-bottom:1px solid var(--line);font-size:15px}
.clist li:last-child{border-bottom:none}
.clist .k{color:var(--muted)} .clist .v{font-family:var(--fm);font-size:14px;color:var(--ink);text-align:right}

/* Footer */
footer{padding-block:clamp(44px,5vw,64px);border-top:1px solid var(--line);background:var(--surface)}
.foot{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px}
@media(max-width:860px){.foot{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.foot{grid-template-columns:1fr}}
.foot .fb{display:flex;align-items:center;gap:11px;font-family:var(--fd);font-weight:700;font-size:19px;color:var(--ink)}
.foot p{font-size:13.5px;color:var(--muted);max-width:38ch;margin-top:12px}
.foot h4{font-family:var(--fm);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 14px}
.foot ul{list-style:none;margin:0;padding:0}
.foot li{margin-bottom:10px}
.foot a{color:var(--ink-soft);font-size:14px} .foot a:hover{color:var(--primary-700)}
.foot .legal{grid-column:1/-1;border-top:1px solid var(--line);margin-top:14px;padding-top:20px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:13px;color:var(--muted)}
.foot .legal a{color:var(--muted)} .foot .legal a:hover{color:var(--primary-700)}
@media(max-width:760px){.grid4,.grid3,.grid2,.steps{grid-template-columns:1fr}}