body {
  background: #0a0a0a;
  color: #eee;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
  margin: 0;
  overflow-x: hidden; /* prevent accidental horizontal scroll */
}

.docu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin: 40px auto;
  max-width: 1200px;
  padding: 0 16px;
  box-sizing: border-box;
}

/* Card styling */
.docu-card {
  background: #111;
  border: 1px solid #222;
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.docu-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 12px rgba(0,0,0,.4);
}

/* Embedded video */
.docu-card iframe {
  width: 100%;
  height: auto;
  aspect-ratio: 16/9;
  border: 0;
  display: block;
  max-width: 100%;
}

/* Metadata */
.docu-meta {
  padding: 12px 16px 16px;
  box-sizing: border-box;
}
.docu-meta h3 {
  margin: 0 0 6px;
  color: #fff;
  font-size: 1rem;
  line-height: 1.3;
}
.docu-meta p {
  margin: 0;
  font-size: 0.9rem;
  color: #aaa;
}

/* Mobile fixes */
@media (max-width: 640px) {
  .docu-grid {
    gap: 16px;
    margin: 24px auto;
    padding: 0 12px;
  }
  .docu-card {
    border-radius: 10px;
  }
  .docu-meta {
    padding: 10px 12px 14px;
  }
  .docu-meta h3 {
    font-size: 0.95rem;
  }
  .docu-meta p {
    font-size: 0.85rem;
  }
}