* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root {
  --bg-color: #0f172a;
  --card-color: #1e293b;
  --text-color: #e5e7eb;
  --muted-text: #94a3b8;
  --accent: #38bdf8;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: auto;
  padding: 2rem;
}

header {
  border-bottom: 1px solid #1e293b;
}

.logo {
  font-size: 1.5rem;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--muted-text);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--accent);
}

.hero {
  padding: 4rem 0;
}

.hero h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero p {
  max-width: 700px;
  margin-bottom: 2rem;
  color: var(--muted-text);
}

.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent);
  color: #0f172a;
  text-decoration: none;
  border-radius: 6px;
  font-weight: bold;
}

.card {
  background-color: var(--card-color);
  padding: 2rem;
  border-radius: 10px;
  margin-bottom: 2rem;
}

.card h3 {
  margin-bottom: 1rem;
}

.card ul {
  margin-left: 1.2rem;
}

.card li {
  margin-bottom: 0.5rem;
  color: var(--muted-text);
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted-text);
  border-top: 1px solid #1e293b;
}
.nav-links a.active {
  color: var(--accent);
  font-weight: bold;
}