body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #0b0f19;
  color: #4d0000;
}

/* Header */
header {
  text-align: center;
  padding: 30px;
  background: linear-gradient(90deg, #111827, #1f2937);
}

/* Nav */
nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  background: #020617;
  padding: 10px;
}

nav a {
  color: #cc0000;
  text-decoration: none;
}

/* Grid layout */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  padding: 30px;
}

/* Cards */
.card {
  background: #990033;
  padding: 20px;
  border-radius: 10px;
  cursor: pointer;
  transition: 0.2s;
}

.card:hover {
  transform: translateY(-5px);
  background: #374151;
}

/* Notes section */
.notes {
  padding: 30px;
}

.note-block {
  background: #111827;
  margin-bottom: 20px;
  padding: 20px;
  border-left: 4px solid #3b82f6;
  border-radius: 6px;
}

/* Footer */
footer {
  text-align: center;
  padding: 15px;
  background: #020617;
}