body {
  background: #0d0d0d;
  color: #e0e0e0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  background: linear-gradient(to right, #0f2db6, #4b9deb);
  padding: 1rem;
  text-align: center;
  color: #fff;
  font-size: 1.4rem;
  font-weight: bold;
}

.layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

aside {
  width: 200px;
  background-color: #121212;
  padding: 1rem;
  border-right: 1px solid #1f1f1f;
}

.nav-link {
  display: block;
  color: #77aaff;
  padding: 0.5rem 1rem;
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  background-color: #1a1a1a;
  color: #ffffff;
}

main {
  flex: 1;
  padding: 2rem;
  overflow-y: auto;
}

.card {
  background: #1a1a1a;
  border-left: 4px solid #4b9deb;
  padding: 1.5rem;
  margin-bottom: 1rem;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

footer {
  padding: 1rem;
  text-align: center;
  background: #0d0d0d;
  font-size: 0.9rem;
  border-top: 1px solid #1f1f1f;
}

.link {
  color: #77aaff;
  text-decoration: none;
}

.link:hover,
.link.active {
  color: #ffffff;
}

/* ----------- Responsive Styles ----------- */
@media (max-width: 768px) {
  .layout {
    flex-direction: column; /* stack sidebar above content */
  }

  aside {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid #1f1f1f;
    display: block;
    padding: 0; /* remove padding so buttons fit */
  }

  .nav-link {
    display: block;
    width: 100%;            
    box-sizing: border-box; 
    text-align: center;       
    margin-bottom: 0.5rem;
    padding: 1rem;
    background: #121212;
    border-radius: 0; /* flush edges for full width */
  }

  .nav-link:last-child {
    margin-bottom: 0;
  }

  main {
    padding: 1rem;
  }

  header {
    font-size: 1.2rem;
    padding: 0.8rem;
  }

  footer {
    font-size: 0.8rem;
  }
}