:root {
  --bg: #0d1117;
  --card-bg: #161b22;
  --text: #e6edf3;
  --accent: #2f81f7;
  --accent-hover: #1f6feb;
  --radius: 14px;
}

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

header {
  text-align: center;
  padding: 4rem 1rem 2rem;
  background: linear-gradient(145deg, #0d1117, #161b22);
}

header h1 {
  font-size: 2.8rem;
  margin: 0;
  color: var(--accent);
}

header p {
  font-size: 1.1rem;
  opacity: 0.85;
}

nav {
  margin-top: 1rem;
}

nav a {
  color: var(--text);
  margin: 0 1rem;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

main {
  padding: 2rem 1rem 4rem;
  max-width: 1100px;
  margin: auto;
}

.card-grid {
  margin-bottom: 3rem;
}

.card-grid h2 {
  text-align: center;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  padding: 2rem 1rem;
  text-align: center;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.icon {
  background: rgba(47, 129, 247, 0.15);
  border-radius: 50%;
  width: 90px;
  height: 90px;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon svg {
  width: 48px;
  height: 48px;
  color: var(--accent);
}

.card h3 {
  margin: 0.8rem 0 0.4rem;
}

.card p {
  font-size: 0.95rem;
  opacity: 0.9;
  margin: 0 1rem 1rem;
}

.cta {
  background: var(--accent);
  color: white;
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  transition: background 0.2s;
}

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

footer {
  text-align: center;
  padding: 2rem 0;
  background: #0b0f14;
  font-size: 0.9rem;
  opacity: 0.7;
}

@media (min-width: 700px) {
  .card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
}