:root {
  --bg: #000000;
  --surface: #111111;
  --surface-border: #262626;
  --text: #f5f5f5;
  --muted: #b3b3b3;
  --accent: #4da3ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  border-bottom: 1px solid var(--surface-border);
  position: sticky;
  top: 0;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(4px);
}

.top-nav {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem;
}

.top-nav a {
  color: var(--text);
  text-decoration: none;
  padding: 0.55rem 0.95rem;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.top-nav a:hover,
.top-nav a.active {
  border-color: var(--accent);
  color: var(--accent);
}

.container {
  width: min(1000px, 92%);
  margin: 2rem auto 3rem;
}

h1 {
  margin-bottom: 0.25rem;
}

.intro {
  color: var(--muted);
  margin-bottom: 1.75rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  background-color: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 12px;
  padding: 1.1rem;
}

.single-card {
  max-width: 650px;
}

.card h2 {
  margin-top: 0;
}

a {
  color: var(--accent);
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.contact-list li {
  margin: 0.5rem 0;
}