*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: #0f1117;
  color: #e2e8f0;
  min-height: 100vh;
}

header {
  background: #141929;
  border-bottom: 3px solid #3b5bdb;
  padding: 1.1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
}
.header-brand { display: flex; align-items: center; gap: 0.9rem; }
header h1 { font-size: 1.3rem; font-weight: 800; letter-spacing: 0.04em; color: #fff; }
.badge {
  font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.12em; color: #748ffc;
  background: #1e2d5a; padding: 0.25rem 0.6rem; border-radius: 999px;
}
.header-nav { display: flex; gap: 0.25rem; }
.nav-link {
  color: #748ffc; text-decoration: none;
  padding: 0.4rem 0.9rem; border-radius: 6px;
  font-size: 0.82rem; font-weight: 600;
  transition: background 0.15s, color 0.15s;
}
.nav-link:hover { background: #1e2d5a; color: #c5d0fc; }
.nav-link.active { background: #3b5bdb; color: #fff; }