:root {
  --bg: #0f172a;
  --surface: #020617;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #38bdf8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--bg);
  color: var(--text);
}

header {
  background-color: var(--surface);
  border-bottom: 1px solid rgba(148, 163, 184, 0.15);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 18px;
  font-weight: 700;
}

nav a {
  margin-left: 24px;
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
}

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

main {
  max-width: 1000px;
  margin: 80px auto;
  padding: 0 24px;
}

.hero {
  text-align: center;
  margin-bottom: 72px;
}

.hero h1 {
  font-size: 38px;
  margin-bottom: 16px;
}

.hero p {
  font-size: 18px;
  line-height: 1.6;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.card {
  background-color: var(--surface);
  border-radius: 12px;
  padding: 28px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 12px;
}

.card p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--muted);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(56, 189, 248, 0.15);
}

footer {
  text-align: center;
  padding: 32px;
  font-size: 14px;
  color: var(--muted);
}