:root{
  --background: 220 20% 4%;
  --foreground: 210 20% 92%;
  --card: 220 18% 8%;
  --primary: 185 85% 50%;
  --primary-foreground: 220 20% 4%;
  --secondary: 220 15% 14%;
  --secondary-foreground: 210 20% 85%;
  --muted-foreground: 215 15% 55%;
  --border: 220 15% 16%;
  --radius: 0.75rem;
  --font-heading: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
}

body{
  background: hsl(var(--background));
  color: hsl(var(--foreground));
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

.container{width:100%;max-width:1400px;margin:0 auto;padding:0 1.5rem}

header.site{
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid hsl(var(--border));
  background: hsl(var(--background) / 0.88);
  backdrop-filter: blur(12px);
}
.head-row{display:flex;align-items:center;justify-content:space-between;padding:.75rem 0;gap:1rem}
.logo{
  display:flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-heading);
  font-weight:700;
  font-size:1.125rem;
  color:inherit;
  text-decoration:none
}
.logo span{color:hsl(var(--primary))}
.logo-mark{width:22px;height:22px;display:block}
.head-nav{display:flex;align-items:center;gap:.75rem}
.head-link{font-size:.9rem;color:hsl(var(--foreground));opacity:.85;text-decoration:none}
.head-link:hover{opacity:1;text-decoration:underline}
.btn-head{
  font-size:.875rem;
  font-weight:600;
  padding:.5rem 1rem;
  border-radius:var(--radius);
  background:hsl(var(--primary));
  color:hsl(var(--primary-foreground));
  text-decoration:none;
  transition:filter .15s;
}
.btn-head:hover{filter:brightness(1.08)}

.site-footer{
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: hsl(var(--muted-foreground));
  border-top: 1px solid hsl(var(--border));
}