:root {
  --epo-azul-oscuro: #1d3557;
  --epo-azul-escudo: #3a7bd5;
  --epo-rojo: #e63946;
  --epo-verde: #2a9d8f;
  --epo-gris-texto: #5b6473;
  --epo-fondo: #f4f6f9;
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: 'Montserrat', sans-serif;
  background: var(--epo-fondo);
}

#menu_navegacion {
  position: fixed;
  inset: 0 auto 0 0;
  width: 270px;
  height: 100vh;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  border-right: 1px solid #dbe3ef;
  box-shadow: 0 8px 24px rgba(29, 53, 87, 0.08);
  z-index: 1200;
  transition: transform .25s ease;
}

.sidebar-inner {
  height: 100%;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.sidebar-header-mobile {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid #e7edf7;
}

.sidebar-header-title {
  color: var(--epo-azul-oscuro);
  font-size: 13px;
  font-weight: 700;
}

.close-menu-btn {
  border: none;
  background: transparent;
  color: var(--epo-azul-oscuro);
  font-size: 20px;
  cursor: pointer;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 16px;
  text-decoration: none;
  border-bottom: 1px solid #e7edf7;
}

.sidebar-logo-img {
  width: 54px;
  height: 54px;
  object-fit: contain;
  border-radius: 10px;
  background: #fff;
  border: 1px solid #e3ebf8;
  padding: 5px;
  box-shadow: 0 3px 10px rgba(58, 123, 213, 0.12);
}

.escuela-nombre {
  color: var(--epo-azul-oscuro);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.1;
}

.escuela-sub {
  color: var(--epo-gris-texto);
  font-size: 12px;
}

.menu_opciones_contenedor {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 10px 10px 14px;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item,
.sub-item {
  width: 100%;
}

.nav-link,
.sub-link {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-decoration: none;
  color: #627086;
  font-size: 13px;
  font-weight: 700;
  border-radius: 10px;
  padding: 10px 12px;
  border-left: 3px solid transparent;
  transition: background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}

.nav-link .icon {
  width: 33px;
  height: 33px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #eaf1fd;
  color: var(--epo-azul-escudo);
  font-size: 14px;
  flex-shrink: 0;
}

.title {
  flex: 1;
  min-width: 0;
}

.chev {
  color: #8c98ab;
  font-size: 11px;
  transition: transform .2s ease;
}

.nav-link:hover,
.sub-link:hover,
.nav-link.active,
.sub-link.active {
  background: #eef4ff;
  color: var(--epo-azul-oscuro);
  border-left-color: var(--epo-azul-oscuro);
  transform: translateX(2px);
}

.nav-link:hover .icon,
.nav-link.active .icon {
  background: linear-gradient(180deg, var(--epo-azul-escudo), #2f67b3);
  color: #fff;
}

.has-sub .sub-list {
  display: none;
  padding-left: 14px;
  margin-top: 2px;
}

.has-sub.open > .sub-list {
  display: block;
}

.has-sub.open > .toggle-sub .chev {
  transform: rotate(90deg);
  color: var(--epo-azul-oscuro);
}

.sub-link {
  background: #f6f9ff;
  border: 1px solid #e6edf9;
  border-left: 3px solid transparent;
  margin-top: 5px;
  font-size: 12px;
  font-weight: 600;
  padding: 9px 11px;
}

.sidebar-footer {
  border-top: 1px solid #e7edf7;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: #fbfdff;
}

.sidebar-user strong {
  color: var(--epo-azul-oscuro);
  font-size: 12px;
  display: block;
}

.btn_cerrar_sesion {
  border: none;
  border-radius: 9px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 11px;
  background: linear-gradient(135deg, var(--epo-rojo) 0%, #cc2a37 100%);
  color: #fff;
  font-family: inherit;
  font-weight: 700;
  font-size: 12px;
}

#overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  z-index: 1100;
  opacity: 0;
  transition: opacity .22s ease;
}

#overlay.active {
  display: block;
  opacity: 1;
}

.mobile-menu-button {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1300;
  border: none;
  border-radius: 10px;
  width: 40px;
  height: 40px;
  background: var(--epo-azul-escudo);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(58, 123, 213, 0.28);
}

body.menu-open {
  overflow: hidden;
}

#contenido {
  margin-left: 270px;
}

@media (max-width: 900px) {
  .mobile-menu-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .sidebar-header-mobile {
    display: flex;
  }

  #menu_navegacion {
    transform: translateX(-100%);
    width: 285px;
  }

  #menu_navegacion.abierto {
    transform: translateX(0);
  }

  #contenido {
    margin-left: 0 !important;
  }
}