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

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Open Sans", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

header {
  position: sticky;
  top: 0;
  background: rgba(15,23,42,0.95);
  border-bottom: 1px solid #1e293b;
  z-index: 10;
}

nav {
  max-width: 1100px;
  margin: auto;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  padding: 0;
  margin: 0;
}

.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.hero video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-content {
  position: relative;
  max-width: 800px;
  padding: 2rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: 1rem;
}

.section {
  max-width: 1100px;
  margin: auto;
  padding: 4rem 1.5rem;
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
}

.card {
  background: #020617;
  border: 1px solid #1e293b;
  border-radius: 0.75rem;
  padding: 1.5rem;
}

.card h3 {
  margin-top: 0;
}

.article {
  max-width: 850px;
  margin: auto;
  padding: 4rem 1.5rem;
}

.article h1 {
  font-size: 2.5rem;
}

footer {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
  border-top: 1px solid #1e293b;
}