* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: #0f172a;
  color: #e5e7eb;
  line-height: 1.6;
}

.container {
  max-width: 960px;
  margin: auto;
  padding: 2rem 1rem;
}

header {
  margin-bottom: 3rem;
}

header h1 {
  font-size: 2.5rem;
  color: #38bdf8;
}

header p {
  color: #94a3b8;
}

.hero {
  margin-bottom: 3rem;
}

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

.hero p {
  max-width: 600px;
}

.topics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background-color: #020617;
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid #1e293b;
}

.card h3 {
  color: #38bdf8;
  margin-bottom: 0.5rem;
}

footer {
  margin-top: 4rem;
  text-align: center;
  color: #64748b;
  font-size: 0.9rem;
}

.video {
  margin-top: 3rem;
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid #1e293b;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.logo {
  width: 120px;
  margin-bottom: 1rem;
}