body {
  margin: 0;
  font-family: 'Comic Sans MS', 'Comic Sans', cursive, sans-serif;
  background: #f7f8fa;
  color: #222;
}
.site-wrapper {
  display: flex;
  min-height: 100vh;
}
.sidebar {
  background: linear-gradient(135deg, #3559e0 0%, #4f8cff 100%);
  color: #fff;
  width: 250px;
  min-width: 200px;
  padding: 2rem 1rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.sidebar-header {
  margin-bottom: 2rem;
}
.site-title {
  font-size: 2rem;
  font-weight: bold;
  margin: 0 0 1rem 0;
  letter-spacing: 2px;
}
.sidebar nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sidebar nav ul li {
  margin-bottom: 1.2rem;
}
.sidebar nav ul li a {
  color: #fff;
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 600;
  transition: color 0.2s;
  border-radius: 8px;
  padding: 0.3rem 0.8rem;
  display: block;
}
.sidebar nav ul li a.active, .sidebar nav ul li a:hover {
  background: #fff;
  color: #3559e0;
}
.main-content {
  flex: 1;
  padding: 2rem 1rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
header {
  margin-bottom: 2rem;
}
.card {
  background: #fffbe7;
  border-radius: 18px;
  box-shadow: 0 2px 8px rgba(53, 89, 224, 0.08);
  padding: 1.5rem;
  margin-bottom: 2rem;
  transition: box-shadow 0.2s;
}
.card:nth-child(2n) {
  background: #e7fff7;
}
.card:nth-child(3n) {
  background: #ffe7fa;
}
.card-title {
  font-size: 1.3rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}
@media (max-width: 900px) {
  .site-wrapper {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    min-width: 0;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
  }
  .sidebar nav ul {
    display: flex;
    flex-direction: row;
    gap: 1rem;
  }
  .sidebar nav ul li {
    margin-bottom: 0;
  }
  .main-content {
    padding: 1rem 0.5rem;
  }
}
@media (max-width: 600px) {
  .sidebar {
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 0.5rem;
  }
  .sidebar-header {
    margin-bottom: 1rem;
  }
  .main-content {
    padding: 0.5rem;
  }
}