:root {
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #cbd5e1;
  --accent: #38bdf8;
  --border: #1f2937;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #0b1221, #0f172a);
  color: var(--text);
}

.container {
  max-width: 960px;
  padding: 24px;
  margin: 0 auto;
}

.hero {
  background: radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.12), transparent 35%),
              radial-gradient(circle at 80% 10%, rgba(14, 165, 233, 0.12), transparent 30%),
              #0b1221;
  border-bottom: 1px solid var(--border);
  padding: 32px 0 24px;
  text-align: center;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: 32px;
  letter-spacing: -0.5px;
}

.hero p {
  margin: 0 auto 16px;
  max-width: 720px;
  color: var(--muted);
  line-height: 1.6;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 12px;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(17, 24, 39, 0.6);
  transition: all 0.2s ease;
}

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

main {
  padding: 32px 0 48px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}

.card h2 {
  margin-top: 0;
  margin-bottom: 10px;
  color: #f8fafc;
}

.card h3 {
  margin-bottom: 8px;
  margin-top: 16px;
  color: #f8fafc;
}

.card p {
  margin: 0 0 10px;
  color: var(--muted);
  line-height: 1.6;
}

.card ul {
  margin: 0 0 10px 18px;
  color: var(--muted);
  line-height: 1.5;
}

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

.footer {
  border-top: 1px solid var(--border);
  background: #0b1221;
  padding: 16px 0 22px;
  color: var(--muted);
  text-align: center;
  font-size: 14px;
}

@media (max-width: 640px) {
  .container {
    padding: 18px;
  }
  .hero h1 {
    font-size: 26px;
  }
}