body {
  margin: 0;
  padding: 0;
  height: 100vh;
  overflow: hidden;
  font-family: 'Segoe UI', sans-serif;
  padding-bottom: 120px; /* si el footer mide 60px */
}

.wrapper {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.left-panel {
  color: white;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-1 {
  background: url('https://oasishelp.org/img/slide-oasis-ayuda-humanitaria.jpg') no-repeat center center;
  background-size: cover;
  filter: grayscale(100%);
  flex: 0 0 30%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-2 {
  background: url('https://oasishelp.org/img/slide-nuestra-mision.jpg') no-repeat center center;
  background-size: cover;
  filter: grayscale(100%);
  flex: 0 0 30%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-3 {
  background: url('https://oasishelp.org/img/slide-nuestra-vision.jpg') no-repeat center center;
  background-size: cover;
  filter: grayscale(100%);
  flex: 0 0 30%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-4 {
  background: url('https://oasishelp.org/img/slide-nuestros-principios.jpg') no-repeat center center;
  background-size: cover;
  filter: grayscale(100%);
  flex: 0 0 30%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-5 {
  background: url('https://oasishelp.org/img/slide-nuestra-razon-de-ser.jpg') no-repeat center center;
  background-size: cover;
  filter: grayscale(100%);
  flex: 0 0 30%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-6 {
  background: url('https://oasishelp.org/img/slide-nuestra-razon-de-ser.jpg') no-repeat center center;
  background-size: cover;
  filter: grayscale(100%);
  flex: 0 0 30%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-sede {
  background: url('https://oasishelp.org/img/slide-sede-demostrativo.jpg') no-repeat center center;
  background-size: cover;
  filter: grayscale(100%);
  flex: 0 0 30%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-decalogo {
  background: url('https://oasishelp.org/img/slide-decalogo.jpg') no-repeat center center;
  background-size: cover;
  filter: grayscale(100%);
  flex: 0 0 30%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.slide-contacto {
  background: url('https://oasishelp.org/img/oasis-contacto.jpg') no-repeat center center;
  background-size: cover;
  filter: grayscale(100%);
  flex: 0 0 30%;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.left-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1;
}

.left-panel .menu-toggle {
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 2;
  cursor: pointer;
  font-size: 1.1rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 5px 10px;
  border-radius: 5px;
}

.left-panel h1 {
  position: relative;
  z-index: 2;
  font-size: 1.5rem;
  margin-bottom: 0;
}

.right-panel {
  flex: 1;
  overflow-y: auto;
  padding: 3rem;
  background: #fff;
  padding-bottom: 80px;
}

#sidebarMenu {
  position: fixed;
  top: 0;
  left: -250px;
  width: 250px;
  height: 100vh;
  background: #212529;
  transition: left 0.3s ease;
  z-index: 3;
  padding-top: 3rem;
}

#sidebarMenu a {
  color: #fff;
  padding: 10px 20px;
  display: block;
  text-decoration: none;
}

#sidebarMenu a:hover {
  background: #343a40;
}

#sidebarMenu.active {
  left: 0;
}

a.active {
  left: 0;
  font-weight: bold;
  color: #fff;
  background-color: #C10000; /*#ff6600;*/
  border-radius: 6px;
}

.pie-texto {
  font-style: italic;
  color: blue;
  text-align: center;
}

.whatsapp-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    background-color: #25D366;
    border-radius: 50%;
    width: 55px;
    height: 55px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}
.whatsapp-btn:hover {
    transform: scale(1.1);
}
.whatsapp-btn img {
    width: 30px;
    height: 30px;
}

#overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  /*background: rgba(0, 0, 0, 0.5);*/
  z-index: 2;
  display: none;
}

#overlay.active {
  display: block;
}

footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: #222;
  color: #fff;
  text-align: center;
  padding: 15px 0;
}

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

  .left-panel {
    flex: 0 0 auto;
    height: 300px;
  }
}