:root{
  --navy:#123b73; --navy-deep:#0c2a55; --teal:#1fa3b0; --teal-soft:#e6f5f7;
  --ink:#1c2733; --muted:#5a6672; --line:#d9e1e8; --bg:#fff; --bg-alt:#f4f8fb;
  --head:'Montserrat',system-ui,sans-serif; --body:'Source Sans 3',system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:400 1.0625rem/1.6 var(--body);color:var(--ink);background:var(--bg)}
img{max-width:100%;height:auto}
a{color:var(--navy)}
:focus-visible{outline:3px solid var(--teal);outline-offset:2px}
.wrap{width:min(1080px,100% - 2.5rem);margin-inline:auto}
.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;background:#fff;padding:.5rem;z-index:10}

h1,h2,h3{font-family:var(--head);color:var(--navy-deep);line-height:1.15;margin:0 0 .6em}
h1{font-size:clamp(2.1rem,5.5vw,3.6rem);font-weight:800;letter-spacing:-.02em}
h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:700}
h3{font-size:1.15rem;font-weight:600}
.lead{font-size:1.25rem;color:var(--muted);max-width:42rem}

/* Header */
.site-header{position:sticky;top:0;z-index:5;background:rgba(255,255,255,.95);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;padding:.6rem 0}
.brand{display:flex;align-items:center;gap:.7rem;text-decoration:none;font:800 1.2rem var(--head);color:var(--navy)}
.brand img{object-fit:contain}
.brand b{color:var(--teal);font-weight:600}
.nav{display:flex;align-items:center;gap:1.6rem}
.nav a{text-decoration:none;color:var(--ink);font:600 .95rem var(--head);padding:.3rem 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a[aria-current=page]{border-color:var(--teal)}
.nav a.btn{color:#fff;padding:.55rem 1.1rem;border-bottom:0}
.nav a.btn[aria-current=page]{box-shadow:0 0 0 2px var(--teal)}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:6px;padding:.45rem .9rem;font:600 .95rem var(--head);color:var(--navy)}

/* Buttons */
.btn{display:inline-block;background:var(--navy);color:#fff;text-decoration:none;font:600 1rem var(--head);
  padding:.8rem 1.5rem;border:0;border-radius:6px;cursor:pointer;transition:background .15s}
.btn:hover{background:var(--navy-deep)}
.btn:disabled{opacity:.6;cursor:wait}
.hero .btn{background:var(--teal);color:#06263a}
.hero .btn:hover{background:#3bbac6}
.hero .btn-ghost{background:transparent;color:#fff;box-shadow:inset 0 0 0 2px rgba(255,255,255,.7)}
.hero .btn-ghost:hover{background:rgba(255,255,255,.12)}
.actions{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:2rem}

/* Hero: the network motif from the logo */
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,var(--navy-deep),var(--navy) 70%);color:#fff}
.hero h1{color:#fff;max-width:14ch}
.hero .lead{color:#cfe3ee}
.hero-inner{position:relative;padding:5.5rem 0 5rem}
.net{position:absolute;inset:0;width:100%;height:100%;color:var(--teal);opacity:.55}
.net circle{animation:pulse 3.2s ease-in-out infinite}
.net circle:nth-child(2n){animation-delay:.8s}.net circle:nth-child(3n){animation-delay:1.6s}
@keyframes pulse{50%{opacity:.35}}
@media (prefers-reduced-motion:reduce){.net circle{animation:none}html{scroll-behavior:auto}}

/* Sections */
.section{padding:4rem 0}
.band{background:var(--bg-alt)}
.page-head{background:var(--bg-alt);padding:3.5rem 0 2.5rem;border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(2rem,4.5vw,2.8rem)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.prose p,.prose li{max-width:60ch}
.plain{list-style:none;padding:0;margin:0}
.plain li{padding:.7rem 0;border-bottom:1px solid var(--line)}

.rows{list-style:none;margin:0 0 2rem;padding:0;border-top:1px solid var(--line)}
.rows li{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:2rem;padding:1.5rem 0;border-bottom:1px solid var(--line)}
.rows h3{margin:0}.rows p{margin:0;color:var(--muted)}
.projects .meta{color:#137a85;font:600 .9rem var(--head)}
.tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.8rem!important}
.tags span{background:var(--teal-soft);color:var(--navy);font-size:.85rem;padding:.15rem .6rem;border-radius:99px}
.textlink{font:600 1rem var(--head)}

/* Form */
form label{display:block;font:600 .95rem var(--head);color:var(--navy-deep);margin-bottom:1.1rem}
input,textarea{display:block;width:100%;margin-top:.35rem;padding:.7rem .8rem;font:inherit;color:var(--ink);
  border:1px solid #b8c4ce;border-radius:6px;background:#fff}
input:focus,textarea:focus{border-color:var(--teal)}
.hp{position:absolute;left:-9999px}
#form-status{margin-top:1rem;font-weight:600}
#form-status.ok{color:#17724a}#form-status.err{color:#b3261e}

/* Footer */
.site-footer{background:var(--navy-deep);color:#cfe3ee;padding-top:2.5rem}
.site-footer a{color:#fff}
.site-footer p{margin:.2rem 0}
.foot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1.5rem;padding-bottom:1.5rem}
.foot strong{color:#fff;font-family:var(--head)}
.legal{border-top:1px solid rgba(255,255,255,.15);padding:1rem 0;font-size:.9rem}

/* Mobile */
@media (max-width:760px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;gap:0;
    background:#fff;border-bottom:1px solid var(--line);padding:.5rem 1.25rem 1rem}
  .nav.open{display:flex}
  .nav a{padding:.8rem 0;border-bottom:1px solid var(--line)}
  .nav a.btn{margin-top:.8rem;text-align:center}
  .split,.rows li{grid-template-columns:1fr;gap:1rem}
  .hero-inner{padding:3.5rem 0}
  .section{padding:2.8rem 0}
}