.m-section-3 {
  max-width: 100%;
  margin: 0 auto;
  padding: var(--espacio-xl) 0;
  animation: fadeIn 0.6s ease-out;
}

.m-st3-titulo {
  font-size: 1.5rem;
  font-weight: var(--peso-bold);
  color: var(--color-texto-principal);
  line-height: 1.3;
  margin-bottom: var(--espacio-xl);
  text-align: center;
  position: relative;
  padding-bottom: var(--espacio-md);
}

.m-st3-titulo::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 4rem;
  height: 0.25rem;
  background: linear-gradient(90deg, var(--color-acento), var(--color-acento-hover));
  border-radius: var(--radio-xl);
  animation: expandWidth 0.8s ease-out;
}

@keyframes expandWidth {
  from {
    width: 0;
  }
  to {
    width: 4rem;
  }
}

.m-st3-ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--espacio-md);
}

.m-st3-ul-li {
  display: block;
  padding: var(--espacio-lg);
  background: linear-gradient(135deg, 
    rgba(59, 130, 246, 0.08), 
    rgba(37, 99, 235, 0.08));
  border: 2px solid var(--color-borde);
  border-radius: var(--radio-lg);
  color: var(--color-texto-principal);
  text-decoration: none;
  font-size: var(--tamaño-texto-lg);
  font-weight: var(--peso-medio);
  text-align: center;
  transition: all var(--transicion-normal);
  position: relative;
  overflow: hidden;
  box-shadow: 0 0.25rem 0.5rem var(--color-sombra);
  animation: fadeInUp 0.7s ease-out;
}

.m-st3-ul-li::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, 
    transparent, 
    rgba(59, 130, 246, 0.15), 
    transparent);
  transition: left 0.6s ease;
}

.m-st3-ul-li::after {
  content: '→';
  position: absolute;
  right: var(--espacio-lg);
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--color-acento);
  opacity: 0;
  transition: all var(--transicion-rapida);
}

.m-st3-ul-li:hover {
  background: linear-gradient(135deg, var(--color-acento), var(--color-acento-hover));
  color: white;
  border-color: var(--color-acento);
  transform: translateX(0.5rem);
  box-shadow: 0 0.5rem 1rem var(--color-sombra-hover);
}

.m-st3-ul-li:hover::before {
  left: 100%;
}

.m-st3-ul-li:hover::after {
  opacity: 1;
  right: var(--espacio-md);
}

.m-st3-ul-li:active {
  transform: translateX(0.25rem) scale(0.98);
}

body.dark .m-st3-ul-li {
  background: linear-gradient(135deg, 
    rgba(96, 165, 250, 0.1), 
    rgba(59, 130, 246, 0.1));
}

body.dark .m-st3-ul-li::before {
  background: linear-gradient(90deg, 
    transparent, 
    rgba(96, 165, 250, 0.2), 
    transparent);
}

@media (min-width: 481px) {
  .main {
    padding: var(--espacio-lg) var(--espacio-xl);
  }

  .m-section-3 {
    padding: var(--espacio-2xl) 0;
  }

  .m-st3-titulo {
    font-size: 1.75rem;
    margin-bottom: var(--espacio-2xl);
  }

  .m-st3-titulo::after {
    width: 5rem;
  }

  .m-st3-ul {
    gap: var(--espacio-lg);
  }

  .m-st3-ul-li {
    padding: var(--espacio-xl);
    font-size: var(--tamaño-texto-xl);
  }

  .m-st3-ul-li::after {
    font-size: 1.5rem;
  }
}

@media (min-width: 769px) {
  .main {
    padding: var(--espacio-xl) var(--espacio-2xl);
  }

  .m-section-3 {
    max-width: 50rem;
    padding: var(--espacio-2xl) 0;
  }

  .m-st3-titulo {
    font-size: 2rem;
  }

  .m-st3-titulo::after {
    width: 6rem;
  }

  .m-st3-ul {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--espacio-lg);
  }

  .m-st3-ul-li:hover {
    transform: translateY(-0.375rem);
  }

  .m-st3-ul-li:hover::after {
    transform: translateY(-50%) rotate(-45deg);
  }
}

@media (min-width: 1024px) {
  .m-section-3 {
    max-width: 70rem;
  }

  .m-st3-titulo {
    font-size: 2.5rem;
  }

  .m-st3-titulo::after {
    width: 7rem;
  }

  .m-st3-ul {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--espacio-xl);
  }

  .m-st3-ul-li {
    padding: var(--espacio-2xl) var(--espacio-xl);
  }
}

@media (min-width: 1440px) {
  .main {
    padding: var(--espacio-2xl) 4rem;
  }

  .m-section-3 {
    max-width: 80rem;
  }

  .m-st3-titulo {
    font-size: 3rem;
  }

  .m-st3-titulo::after {
    width: 8rem;
  }

  .m-st3-ul {
    gap: var(--espacio-2xl);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(1.25rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.m-st3-ul li:nth-child(1) .m-st3-ul-li {
  animation-delay: 0.1s;
}

.m-st3-ul li:nth-child(2) .m-st3-ul-li {
  animation-delay: 0.2s;
}

.m-st3-ul li:nth-child(3) .m-st3-ul-li {
  animation-delay: 0.3s;
}

.m-st3-ul li:nth-child(4) .m-st3-ul-li {
  animation-delay: 0.4s;
}

.m-st3-ul li:nth-child(5) .m-st3-ul-li {
  animation-delay: 0.5s;
}

.m-st3-ul li:nth-child(6) .m-st3-ul-li {
  animation-delay: 0.6s;
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0.25rem 0.5rem var(--color-sombra);
  }
  50% {
    box-shadow: 0 0.375rem 0.75rem var(--color-sombra-hover);
  }
}

.m-st3-ul-li:focus-visible {
  outline: 2px solid var(--color-acento);
  outline-offset: 0.25rem;
  animation: pulse 1.5s ease-in-out infinite;
}