:root {
  --bg: #0d1117;
  --bg-light: #161b22;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --card: #1c2128;
  --border: #30363d;
}

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

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

header {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

nav {
  max-width: 1100px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.nav-links a {
  margin-left: 24px;
  text-decoration: none;
  color: var(--muted);
  font-size: 15px;
}

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

main {
  max-width: 1100px;
  margin: 40px auto;
  padding: 0 20px;
}

.hero {
  margin-top: 40px;
}

.hero h1 {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 12px;
}

.hero p {
  font-size: 18px;
  color: var(--muted);
  max-width: 600px;
}

.section {
  margin-top: 60px;
}

.section h2 {
  font-size: 28px;
  margin-bottom: 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 20px;
  border-radius: 10px;
  transition: 0.2s;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  color: var(--muted);
  font-size: 14px;
}

.btn {
  display: inline-block;
  margin-top: 12px;
  padding: 8px 14px;
  background: var(--accent);
  color: white;
  border-radius: 6px;
  text-decoration: none;
  font-size: 14px;
}

.btn:hover {
  background: var(--accent-hover);
}

footer {
  margin-top: 60px;
  padding: 20px;
  text-align: center;
  color: var(--muted);
  border-top: 1px solid var(--border);
}