:root {
  --bg: #0f172a;
  --bg-alt: #111827;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #38bdf8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero {
  padding: 100px 0;
  background: linear-gradient(135deg, #020617, #0f172a);
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
}

.subtitle {
  color: var(--muted);
  margin: 20px 0 40px;
}

.btn {
  display: inline-block;
  padding: 14px 28px;
  background: var(--accent);
  color: #000;
  text-decoration: none;
  border-radius: 999px;
  font-weight: 600;
}

.nav {
  position: sticky;
  top: 0;
  background: rgba(15,23,42,0.9);
  backdrop-filter: blur(10px);
  z-index: 10;
}

.nav-inner {
  display: flex;
  gap: 20px;
  padding: 10px 0;
  overflow-x: auto;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  font-size: 0.9rem;
}

.section {
  padding: 80px 0;
}

.section.alt {
  background: var(--bg-alt);
}

h2 {
  font-size: 2rem;
  margin-bottom: 30px;
}

.card {
  background: var(--card);
  padding: 24px;
  border-radius: 16px;
  margin-bottom: 20px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.long-list li {
  margin-bottom: 10px;
}

.example-img {
  max-width: 100%;
  border-radius: 16px;
  margin-top: 20px;
}

.code {
  background: #020617;
  padding: 20px;
  border-radius: 12px;
  overflow-x: auto;
}

.footer {
  padding: 40px 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}