/* SERSO Engineering — Style Guide v2 (v0.1) base CSS
   Dark, matte, low-contrast, readable. Accents only. */

:root{
  --bg-0:#0b0f14;
  --bg-1:#0a0f17;
  --bg-2:#0e141c;

  /* v1 brand accents (toned down) */
  --aqua:#33FFCC;     /* from logo */
  --blue:#3366FF;
  --charcoal:#242427;

  --surface: rgba(255,255,255,0.06);
  --surface-2: rgba(255,255,255,0.085);
  --border: rgba(255,255,255,0.10);

  --text: rgba(255,255,255,0.88);
  --muted: rgba(255,255,255,0.64);
  --faint: rgba(255,255,255,0.52);

  --link: rgba(170,205,255,0.92);
  --link-hover: rgba(200,225,255,0.98);

  --shadow: 0 10px 28px rgba(0,0,0,0.45);
  --radius: 16px;
  --maxw: 980px;

  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;

  --base: 18px;
  --lh: 1.55;
}

*{ box-sizing:border-box; }

html{ color-scheme: dark; font-size: var(--base); }
body{
  margin:0;
  font-family: var(--font);
  line-height: var(--lh);
  color: var(--text);
  background:
    radial-gradient(1200px 800px at 12% 12%, rgba(51,255,204,0.06), rgba(0,0,0,0) 60%),
    radial-gradient(900px 700px at 88% 20%, rgba(51,102,255,0.05), rgba(0,0,0,0) 55%),
    linear-gradient(135deg, var(--bg-1), var(--bg-0) 35%, var(--bg-2));
}

a{ color: var(--link); text-decoration:none; }
a:hover{ color: var(--link-hover); text-decoration: underline; }
a:focus{ outline:2px solid rgba(170,205,255,0.55); outline-offset:2px; border-radius:10px; }

.container{
  width: min(var(--maxw), calc(100% - 40px));
  margin: 0 auto;
}

.skip-link{
  position:absolute;
  left: 12px;
  top: 10px;
  padding: 10px 12px;
  background: rgba(255,255,255,0.10);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  transform: translateY(-140%);
  z-index: 50;
}
.skip-link:focus{ transform: translateY(0); }

/* Top navigation */
.nav{
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(10,15,23,0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav-inner{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  flex-wrap: wrap;
}

/* Brand lockup */
.brand{
  display:flex;
  align-items:center;
  gap: 12px;
  min-height: 36px;
}
.brand a{
  display:flex;
  align-items:center;
  gap: 12px;
  text-decoration: none;
}
.brand a:hover{ text-decoration: none; }
.logo{
  height: 30px;
  width: auto;
  display:block;
}
.brand-sub{
  font-weight: 650;
  letter-spacing: 0.2px;
  color: var(--muted);
  font-size: 0.98rem;
  margin-top: 1px;
}

/* Menu */
.menu{
  display:flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}
.menu a{
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--muted);
}
.menu a:hover{
  color: var(--text);
  background: rgba(255,255,255,0.05);
  text-decoration: none;
}
.menu a[aria-current="page"]{
  color: rgba(255,255,255,0.90);
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.08);
}

/* Main layout */
main{ padding: 26px 0 12px; }

/* Cards / panels */
.card, .panel, .hero-card{
  background: linear-gradient(180deg, var(--surface), rgba(255,255,255,0.045));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.hero{
  display:grid;
  gap: 18px;
}
.hero-top{
  display:flex;
  flex-direction: column;
  gap: 10px;
}
.kicker{
  font-size: 0.92rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
h1,h2,h3{ margin: 0 0 10px 0; letter-spacing: 0.2px; }
h1{ font-size: 1.55rem; }
h2{ font-size: 1.08rem; color: rgba(255,255,255,0.90); }
.subhead{ color: var(--muted); margin: 0; }

.lede{ color: rgba(255,255,255,0.84); }

.section{ margin-top: 18px; }
.grid{
  display:grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
@media (min-width: 860px){
  .grid{ grid-template-columns: 1fr 1fr; }
  .split{ display:grid; grid-template-columns: 1.2fr 0.8fr; gap: 18px; align-items: start; }
}

.list{ margin: 10px 0 0; padding-left: 18px; }
.list li{ margin: 6px 0; color: var(--text); }

.small{ font-size: 0.92rem; color: var(--muted); }

/* Buttons */
.hero-actions{ display:flex; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.btn{
  display:inline-flex;
  align-items:center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.05);
  color: rgba(255,255,255,0.88);
  text-decoration: none;
}
.btn:hover{
  background: rgba(255,255,255,0.08);
  text-decoration: none;
}
.btn-primary{
  border-color: rgba(51,255,204,0.22);
  background: linear-gradient(180deg, rgba(51,255,204,0.14), rgba(255,255,255,0.05));
}
.btn-primary:hover{
  background: linear-gradient(180deg, rgba(51,255,204,0.18), rgba(255,255,255,0.06));
}

/* Footer */
.footer{
  padding: 22px 0 40px;
  margin-top: 18px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.footer-inner{
  display:flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-right{
  display:flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

/* Utility */
.mono{ font-family: var(--mono); }