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

body {
  font-family: 'DM Sans', sans-serif;
  background-color: #0f172a;
  color: #e2e8f0;
  line-height: 1.6;
}

header {
  background: linear-gradient(90deg, #1e3a8a, #2563eb);
  color: #fff;
  padding: 1rem;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

header .current-user {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: #cbd5e1;
}

.container {
  display: flex;
  flex-wrap: wrap;
  margin: 1rem;
  gap: 1rem;
}

.sidebar {
  flex: 1 1 200px;
  background-color: #1e293b;
  padding: 1rem;
  border-radius: 8px;
  min-width: 180px;
  animation: fadeIn 1s ease;
}

main {
  flex: 2 1 400px;
  background-color: #1e40af;
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
  animation: fadeIn 1.2s ease;
}

h2 {
  color: #93c5fd;
  margin-bottom: 0.5rem;
}

a {
  color: #bfdbfe;
  text-decoration: none;
  display: inline-block;
  padding: 0.2rem 0;
  transition: all 0.2s ease-in-out;
}

a:hover {
  color: #fff;
  transform: translateX(4px);
}

button {
  margin-top: 1rem;
  padding: 0.6rem 1.2rem;
  background-color: #3b82f6;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
}

button:hover {
  background-color: #60a5fa;
  transform: scale(1.05);
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: #1e293b;
  font-size: 0.9rem;
  color: #94a3b8;
  margin-top: 1rem;
  animation: fadeIn 1.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .container {
    flex-direction: column;
  }
}