:root {
  --color-primario: #30B9B1;
  --color-primario-oscuro: #26938D;
  --color-fondo-suave: #A5DFDC;
  --color-texto: #333333;
  --color-blanco: #FFFFFF;
  --color-gris-claro: #D9D9D9;
  --color-azul-logo: #3B83BD;
  --color-morado-logo: #7E57C2;
  --color-aguamarina-logo: #4DD0E1;
  --color-sombra: rgba(0, 0, 0, 0.1);

  --header-height: 80px;
  --mobile-breakpoint: 768px;
  --transition-speed: 0.3s;
}

/* HEADER */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-blanco);
  height: var(--header-height);
  padding: 0 2rem;
  box-shadow: 0 2px 10px var(--color-sombra);
  transition: all var(--transition-speed) ease;
}

.logo {
  height: 50px;
  transition: transform var(--transition-speed) ease;
}

.logo:hover {
  transform: scale(1.05);
}

/* BOTÓN HAMBURGUESA */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  color: var(--color-primario);
  padding: 0.5rem;
  z-index: 1001;
}

.menu-toggle:focus {
  outline: 2px solid var(--color-primario-oscuro);
}

/* NAVBAR */
.navbar {
  display: flex;
  transition: all var(--transition-speed) ease;
}

.menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.menu > li {
  position: relative;
}

.menu a {
  text-decoration: none;
  color: var(--color-texto);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 500;
  transition: all var(--transition-speed) ease;
  display: block;
}

.menu a:hover,
.menu a:focus {
  background-color: var(--color-primario);
  color: var(--color-blanco);
}

/* SUBRAYADO HOVER */
.menu > li > a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primario);
  transition: all var(--transition-speed) ease;
  transform: translateX(-50%);
}

.menu > li > a:hover::after,
.menu > li > a:focus::after {
  width: calc(100% - 2rem);
}

/* SUBMENÚ */
.submenu {
  position: relative;
}

.submenu-toggle {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

/* ÍCONO DE FLECHA VERDE (solo uno visible) */
.dropdown-arrow {
  font-size: 0.6rem;
  color: var(--color-primario-oscuro);
  transition: transform var(--transition-speed) ease;
  margin-left: 0.2rem;
}

.submenu.show .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--color-blanco);
  border-radius: 8px;
  min-width: 220px;
  padding: 0.5rem 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-speed) ease;
  z-index: 100;
}

.submenu.show .dropdown,
.submenu:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown li {
  list-style: none;
}

.dropdown a {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.6rem 1.2rem;
  color: var(--color-texto);
  transition: all var(--transition-speed) ease;
}

.dropdown a:hover,
.dropdown a:focus {
  background-color: var(--color-fondo-suave);
  color: var(--color-primario);
}

.dropdown img {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  header {
    padding: 0 1rem;
  }

  .menu-toggle {
    display: block;
  }

  .navbar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-blanco);
    flex-direction: column;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    padding: 1rem 0;
  }

  .navbar.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .menu {
    flex-direction: column;
    align-items: stretch;
    padding: 0 1rem;
  }

  .menu > li {
    margin: 0.2rem 0;
  }

  .menu a {
    padding: 0.8rem 1rem;
  }

  .menu > li > a::after {
    display: none;
  }

  .dropdown {
    position: static;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    max-height: 0;
    overflow: hidden;
    transform: none;
    transition: max-height var(--transition-speed) ease;
  }

  .submenu.show .dropdown {
    max-height: 500px;
    margin-top: 0.5rem;
    padding: 0.5rem 0;
  }

  .navbar::before {
    content: '';
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-speed) ease;
  }

  .navbar.active::before {
    opacity: 1;
    pointer-events: auto;
  }
}

/* Mostrar submenú en desktop al pasar el cursor */
@media (hover: hover) and (pointer: fine) {
  .submenu:hover .dropdown {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
}