:root{
  --bg: #0d1117;
  --card: #111827;
  --muted: #ffffcc;
  --fg: #e5e7eb;
  --accent: #0ea5e9;
  --accent-2: #22d3ee;
  --shadow: rgba(0,0,0,.25);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

/* Header & nav */
.site-header{
  position: sticky; top:0; z-index:1000;
  backdrop-filter: blur(8px);
  background: rgba(13,17,23,.75);
  border-bottom: 1px solid #1f2937;
  display:flex; align-items:center; justify-content:space-between;
  padding:.75rem 1rem;
}
.brand{display:flex; align-items:center; gap:.75rem}
.logo{color:var(--fg); text-decoration:none; font-weight:700; letter-spacing:.4px}
.burger{
  width:42px; height:42px; border-radius:10px; border:1px solid #243142; background:#0b1220;
  display:flex; flex-direction:column; align-items:center; justify-content:center; gap:4px;
  box-shadow: 0 4px 14px var(--shadow);
}
.burger-line{display:block; width:20px; height:2px; background:linear-gradient(90deg,var(--accent),var(--accent-2)); border-radius:2px}
.burger{display:none}

.site-nav ul{list-style:none; display:flex; gap:.25rem; margin:0; padding:0}
.site-nav a{
  display:block; padding:.5rem .75rem; border-radius:10px; text-decoration:none;
  color:var(--fg); border:1px solid transparent;
}
.site-nav a:hover{background:#0b1220; border-color:#243142}
.site-nav a.active{background:linear-gradient(90deg, rgba(14,165,233,.15), rgba(34,211,238,.15)); border-color:#1f6b87}

/* Mobile slide-in */
@media (max-width: 860px){
  .burger{display:flex}
  .site-nav{
    position: fixed; inset: 0 0 0 30%;
    background: #0b1220;
    box-shadow: -6px 0 18px var(--shadow);
    transform: translateX(100%);
    transition: transform .28s ease;
    padding-top:4.5rem;
  }
  .site-nav.open{ transform: translateX(0); }
  .site-nav ul{ flex-direction:column; padding:0 1rem; gap:.5rem }
  .site-nav a{ border:1px solid #243142; background:#0b1220 }
  body.nav-open{ overflow:hidden }
}

/* Layout */
main{max-width:1100px; margin:2rem auto; padding:0 1rem}
.hero{
  background: radial-gradient(1000px 400px at 0% -20%, rgba(14,165,233,.25), transparent),
              radial-gradient(1000px 400px at 100% 120%, rgba(34,211,238,.25), transparent);
  border:1px solid #1f2937;
  border-radius:20px;
  padding:2rem;
  box-shadow: 0 10px 30px var(--shadow);
}
.hero h1{font-size: clamp(1.8rem, 2.2vw + 1rem, 3rem); margin:.2rem 0}
.hero p{color:var(--muted); margin:.5rem 0 1rem}
.hero .cta{display:flex; gap:.75rem; flex-wrap:wrap}
.btn{
  display:inline-block; padding:.7rem 1rem; border-radius:12px; text-decoration:none; font-weight:600;
  border:1px solid #1f2937; background:#0b1220; color:var(--fg);
}
.btn.primary{ background: linear-gradient(90deg, var(--accent), var(--accent-2)); color:#04121a; border:none }

.grid{ display:grid; gap:1rem; grid-template-columns: repeat(12, 1fr) }
.col-12{ grid-column: span 12 }
.col-6{ grid-column: span 6 }
.col-4{ grid-column: span 4 }
@media (max-width: 860px){ .col-6,.col-4{ grid-column: span 12 } }

/* Card component */
.card{
  border:1px solid #1f2937; background:var(--card); border-radius:18px; padding:1rem;
  box-shadow: 0 8px 22px var(--shadow);
}
.card h3{ margin:.2rem 0 .5rem }
.card p{ color:var(--fg) }
.card .meta{ color: var(--muted); font-size:.9rem }
.card .actions{ margin-top:.75rem }
.card .actions a{ margin-right:.5rem }

/* Footer */
.site-footer{ border-top:1px solid #1f2937; color:var(--muted); padding:1.5rem; text-align:center; margin-top:3rem }