body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f8fafc;
  margin: 0;
}

/* Sidebar */
#sidebar {
  min-height: 100vh;
  width: 240px;
  background: #1e293b;
  color: #f1f5f9;
  position: fixed;
  top: 0;
  left: 0;
  transition: all 0.3s ease-in-out;
  z-index: 1100;
}
#sidebar.collapsed {
  width: 70px;
}
#sidebar nav .menu-link {
  padding: 12px 20px;
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  transition: all 0.2s;
  color: #cbd5e1;
  text-decoration: none;
  border-left: 3px solid transparent;
}
#sidebar nav .menu-link:hover {
  background: rgba(255,255,255,0.08);
  color: #38bdf8;
  border-left: 3px solid #38bdf8;
}
#sidebar.collapsed nav .menu-link span {
  display: none;
}

/* Overlay móviles */
#overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  display: none;
}
#overlay.active { display: block; }

/* Content desplazable */
#content {
  transition: margin-left 0.3s ease-in-out;
  margin-left: 240px;
}
#sidebar.collapsed ~ #content {
  margin-left: 70px;
}

/* Header/Footer desplazables */
.navbar-custom {
  background: #0f172a;
  color: #f1f5f9;
  transition: margin-left 0.3s ease-in-out;
  margin-left: 240px;
}
#sidebar.collapsed ~ .navbar-custom {
  margin-left: 70px;
}
footer {
  transition: margin-left 0.3s ease-in-out;
  margin-left: 240px;
}
#sidebar.collapsed ~ footer {
  margin-left: 70px;
}

/* Responsive móviles */
@media(max-width: 991px) {
  #sidebar { left: -240px; }
  #sidebar.active { left: 0; }
  #content, .navbar-custom, footer {
    margin-left: 0 !important;
  }
}