:root {
  --color-navy: #0A2342;
  --color-blue: #4FC3F7;
  --color-white: #fff;
  --color-navy-light: #183661;
  --color-blue-light: #E6F7FF;
}

body {
  background: linear-gradient(135deg, #151a1e 60%, #222f3e 100%);
  min-height: 100vh;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 40px 40px;
  color: var(--color-white);
  font-family: 'Georgia', 'Times New Roman', Times, serif;
  margin: 0;
}

header, .navbar {
  background: var(--color-navy-light);
  padding: 1.5em 0 1em 0;
  text-align: center;
}

.logo {
  height: 80px;
  max-width: 90vw;
  vertical-align: middle;
}

.nav-links {
  display: inline-block;
  margin-left: 40px;
  vertical-align: middle;
}
.nav-link {
  color: var(--color-blue);
  font-family: inherit;
  font-weight: bold;
  font-size: 1.1em;
  margin: 0 12px;
  text-decoration: none;
  padding: 8px 18px;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}
.nav-link:hover, .nav-link.active {
  background: var(--color-blue-light);
  color: var(--color-navy);
}

a {
  color: var(--color-blue);
  text-decoration: none;
  font-weight: bold;
}

a:hover {
  color: var(--color-blue-light);
}

button, .btn-primary {
  background: var(--color-blue);
  color: var(--color-navy);
  border: none;
  border-radius: 6px;
  font-weight: bold;
  padding: 0.6em 1.5em;
  margin-top: 1em;
  cursor: pointer;
}

button:hover, .btn-primary:hover {
  background: var(--color-blue-light);
  color: var(--color-navy);
}

.card, .panel {
  background: var(--color-navy-light);
  border: 1px solid var(--color-blue);
  border-radius: 16px;
  padding: 2em;
  margin: 2em auto;
  max-width: 600px;
  box-shadow: 0 2px 12px rgba(10,35,66, 0.12);
}

@media (max-width: 600px) {
  .logo {
    height: 48px;
  }
  .card, .panel {
    padding: 1em;
    max-width: 98vw;
  }
}