html, body {
  font-family: 'Segoe UI', sans-serif;
  scroll-behavior: smooth;
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
}

.hero {
  padding-top: 100px;
  padding-bottom: 60px;
  min-height: 100vh;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding-left: 5%;
  padding-right: 5%;
  gap: 20px;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.2;
  z-index: 0;
}

.hero-image {
  flex: 1;
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
  animation: fadeInRight 1s ease-in-out;
}
.hero-image img {
  max-width: 350px;
  width: 100%;
}

.hero-content-wrapper {
  flex: 1;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding-left: 2rem;
}
.hero-content {
  max-width: 620px;
  animation: fadeInLeft 1s ease-in-out;
}

.hero-content h1 {
  font-size: 2.8rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-primary);
}
.hero-content .descripcion-seccion {
  font-size: 1.1rem;
  color: var(--color-text);
  margin-bottom: 20px;
}

.start-btn {
  background-color: var(--color-secondary);
  color: #212529;
  padding: 10px 24px;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  display: inline-block;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: background-color 0.3s ease;
}
.start-btn:hover {
  background-color: var(--color-secondary-dark);
}

.intro-leucemias {
  background: var(--color-bg-alt);
  color: var(--color-text);
}
.titulo-seccion {
  font-size: 2.5rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 20px;
  color: var(--color-primary);
}
.titulo-seccion-2 {
  font-size: 2rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 20px;
  color: var(--color-primary);
}
.descripcion-seccion {
  font-size: 1.2rem;
  color: var(--color-text-light);
  max-width: 800px;
  margin: 0 auto 30px;
}

.features {
  background: var(--color-bg);
  padding: 60px 0;
}
.features .icon {
  max-width: 80px;
  margin-bottom: 15px;
  transition: transform 0.3s ease;
}
.features h5 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-primary);
}
.features p {
  font-size: 1rem;
  color: var(--color-text);
}
.features .col-md-4:hover .icon {
  transform: scale(1.1);
}

.cta-final {
  background: var(--color-primary);
  color: #fff;
  text-align: center;
  padding: 40px 20px;
}
.cta-final h2 {
  font-size: 2rem;
  font-weight: 700;
}
.cta-final .btn {
  background-color: #fff;
  color: var(--color-primary);
  font-size: 1.1rem;
  padding: 10px 30px;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
}
.cta-final .btn:hover {
  background-color: var(--color-bg-alt);
  transform: translateY(-2px);
}

@keyframes fadeInLeft {
  0% { opacity: 0; transform: translateX(-30px); }
  100% { opacity: 1; transform: translateX(0); }
}
@keyframes fadeInRight {
  0% { opacity: 0; transform: translateX(30px); }
  100% { opacity: 1; transform: translateX(0); }
}

@media (max-width: 768px) {
  .hero {
    flex-direction: column-reverse;
    padding: 20px 15px;
    height: auto;
    gap: 20px;
  }
  .hero-image img {
    max-width: 220px;
  }
  .hero-content h1 {
    font-size: 1.6rem;
  }
  .hero-content .descripcion-seccion {
    font-size: 0.95rem;
  }
  .start-btn {
    font-size: 0.9rem;
    padding: 8px 20px;
  }
  .cta-final h2 {
    font-size: 1.5rem;
  }
  .cta-final .btn {
    font-size: 1rem;
    padding: 8px 24px;
  }
  .features {
    padding: 40px 0;
  }
  .features h5 {
    font-size: 1.1rem;
  }
  .features p {
    font-size: 0.95rem;
  }
  .features .icon {
    max-width: 60px;
  }
  .hero-content-wrapper {
    padding-left: 0;
    justify-content: center;
    text-align: center;
  }
  .hero-content {
    padding: 0;
  }
}