/*
  Defense Research Labs — minimal, modern styles
  Typeface: Inter (via Google Fonts)
*/

:root {
  --bg: #0b1220;
  --elev-1: #0f172a;
  --elev-2: #0b1220;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --brand: #0ea5e9; /* sky-500 */
  --brand-2: #22d3ee; /* cyan-400 */
  --accent: #38bdf8; /* sky-400 */
  --card: #0f1a2f;
  --ring: rgba(56, 189, 248, 0.35);
  --grid: rgba(56, 189, 248, 0.08);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 800px at 80% -10%, rgba(14,165,233,0.15), transparent 50%),
              radial-gradient(800px 600px at -10% 20%, rgba(34,211,238,0.12), transparent 40%),
              var(--bg);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brand);
  color: #001018;
  padding: 8px 12px;
  border-radius: 6px;
}
.skip-link:focus { left: 12px; top: 12px; outline: 3px solid var(--ring); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(140%) blur(8px);
  background: color-mix(in oklab, #0b1220 80%, #0ea5e9 20% / 5%);
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  text-decoration: none;
  color: var(--text);
  margin-left: 20px;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #001018;
  font-weight: 800;
  letter-spacing: 0.5px;
}
.brand-word { font-weight: 600; }

.site-nav ul { list-style: none; display: flex; gap: 22px; margin: 0; padding: 0; }
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
}
.site-nav a:hover { color: var(--text); }

.nav-toggle { display: none; background: transparent; border: 0; cursor: pointer; }
.nav-toggle .nav-toggle-bar { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 2px; }

/* Hero */
.section { padding: 80px 0; }
.section-alt { background: linear-gradient(180deg, rgba(15,26,47,0.6), rgba(15,26,47,0.2)); border-top: 1px solid rgba(148, 163, 184, 0.08); border-bottom: 1px solid rgba(148, 163, 184, 0.08); }
.hero { padding-top: 120px; }
.hero-inner { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: center; }
.hero-copy .lead { color: var(--muted); font-size: 1.1rem; max-width: 60ch; }

.h1 { font-size: clamp(2rem, 5vw, 3.25rem); line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
.h2 { font-size: clamp(1.5rem, 3.6vw, 2rem); margin: 0 0 8px; }
.h3 { font-size: 1.15rem; margin: 0 0 6px; }
.h4 { font-size: 1rem; margin: 0 0 6px; color: var(--text); }

.cta-row { display: flex; gap: 12px; margin: 20px 0 10px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 10px 14px; border-radius: 10px; text-decoration: none; font-weight: 600; border: 1px solid rgba(148,163,184,0.15); }
.btn.primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #001018; border-color: transparent; box-shadow: 0 6px 24px rgba(14,165,233,0.25); }
.btn.ghost { color: var(--text); background: rgba(2,6,23,0.3); }
.btn:hover { transform: translateY(-1px); transition: transform 160ms ease; }
.btn:focus { outline: 3px solid var(--ring); outline-offset: 2px; }

.meta-row { display: flex; gap: 18px; color: var(--muted); flex-wrap: wrap; margin-top: 14px; font-size: 0.95rem; }
.meta-row a { color: var(--accent); text-underline-offset: 3px; }

.hero-visual { position: relative; height: 280px; }
.grid-backdrop {
  position: absolute; inset: 0;
  background-image: linear-gradient(transparent 23px, var(--grid) 24px), linear-gradient(90deg, transparent 23px, var(--grid) 24px);
  background-size: 24px 24px;
  border-radius: 16px;
  box-shadow: inset 0 0 0 1px rgba(148,163,184,0.08), 0 10px 30px rgba(0,0,0,0.25);
}
.orb { position: absolute; filter: blur(16px); opacity: 0.9; }
.orb-1 { width: 160px; height: 160px; border-radius: 50%; background: radial-gradient(circle at 30% 30%, var(--brand), transparent 60%); top: -20px; right: -20px; }
.orb-2 { width: 220px; height: 220px; border-radius: 50%; background: radial-gradient(circle at 40% 40%, var(--brand-2), transparent 55%); bottom: -30px; left: -20px; }
.orb-3 { width: 180px; height: 180px; border-radius: 50%; background: radial-gradient(circle at 50% 50%, var(--accent), transparent 60%); top: 20px; right: 20px; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-top: 20px; }
.card {
  background: linear-gradient(180deg, rgba(15,26,47,0.7), rgba(2,6,23,0.7));
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 14px;
  padding: 18px;
  color: var(--muted);
  min-height: 120px;
}
.card:hover { border-color: rgba(56, 189, 248, 0.35); box-shadow: 0 10px 30px rgba(2,6,23,0.4); }

/* Principles */
.principles { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.principles li { display: grid; grid-template-columns: 18px 1fr; gap: 12px; align-items: start; background: rgba(2,6,23,0.35); border: 1px solid rgba(148,163,184,0.1); border-radius: 14px; padding: 14px 16px; color: var(--muted); }
.principles .dot { width: 10px; height: 10px; border-radius: 50%; background: radial-gradient(circle at 30% 30%, var(--accent), transparent 70%); margin-top: 6px; }

/* About */
.about-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 20px; }
.about-block { background: rgba(2,6,23,0.35); border: 1px solid rgba(148,163,184,0.1); border-radius: 14px; padding: 16px; color: var(--muted); }

/* Contact */
.contact { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 24px; align-items: stretch; }
.contact-info .list { list-style: none; padding: 0; margin: 14px 0 0; color: var(--muted); }
.contact-info .list li { margin: 6px 0; }
.contact-card { position: relative; border-radius: 16px; border: 1px solid rgba(148,163,184,0.1); background: linear-gradient(180deg, rgba(15,26,47,0.6), rgba(2,6,23,0.5)); min-height: 220px; box-shadow: inset 0 0 0 1px rgba(148,163,184,0.06); }

/* Footer */
.site-footer { border-top: 1px solid rgba(148,163,184,0.1); background: rgba(2,6,23,0.5); }
.footer-inner { display: flex; flex-direction: column; gap: 8px; padding: 18px 0; text-align: center; }
.footer-meta { display: flex; gap: 16px; flex-wrap: wrap; color: var(--muted); justify-content: center; }
.footer-meta a { color: var(--accent); text-decoration: none; }
.footer-fineprint { color: var(--muted); font-size: 0.95rem; }

/* Typography refinements */
p { margin: 0; }
.section-head { margin-bottom: 10px; }
.section-sub { color: var(--muted); margin: 0; }

/* Responsive */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; height: 220px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .principles { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .contact { grid-template-columns: 1fr; }
  .site-nav { position: absolute; top: 60px; right: 20px; background: rgba(2,6,23,0.9); padding: 12px; border-radius: 12px; border: 1px solid rgba(148,163,184,0.12); display: none; }
  .site-nav.open { display: block; }
  .nav-toggle { display: inline-block; }
  .site-nav ul { flex-direction: column; gap: 10px; }
}

/* Reduced motion */
.no-motion .orb, .no-motion .btn { transition: none !important; filter: none !important; }