body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f4f6fb;
  color: #222;
}
header {
  background: #1976d2;
  color: #fff;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
#menu-toggle {
  background: none;
  border: none;
  color: #fff;
  font-size: 2rem;
  cursor: pointer;
  display: none;
}
#sidebar {
  width: 240px;
  background: #fff;
  border-right: 1px solid #e0e0e0;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  overflow-y: auto;
  padding-top: 70px;
  transition: transform 0.3s ease;
}
#sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
#sidebar li {
  border-bottom: 1px solid #f0f0f0;
}
#sidebar a {
  display: block;
  padding: 1rem;
  color: #1976d2;
  text-decoration: none;
  font-weight: 500;
  transition: background 0.2s;
}
#sidebar a:hover, #sidebar a.active {
  background: #e3f0fc;
}
#main-content {
  margin-left: 240px;
  padding: 2rem 1rem;
  min-height: 100vh;
  transition: margin-left 0.3s;
}
@media (max-width: 800px) {
  #sidebar {
    transform: translateX(-100%);
    position: fixed;
    z-index: 1000;
    height: 100%;
  }
  #sidebar.open {
    transform: translateX(0);
  }
  #main-content {
    margin-left: 0;
    padding-top: 80px;
  }
  #menu-toggle {
    display: block;
  }
}
button, input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
  border-radius: 4px;
  border: 1px solid #b0bec5;
  padding: 0.5rem 1rem;
  margin: 0.25rem 0;
}
button {
  background: #1976d2;
  color: #fff;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}
button:hover {
  background: #1565c0;
}
.card {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
  padding: 1rem;
  margin-bottom: 1.5rem;
}
input[type="range"] {
  width: 100%;
}