:root {
  --bs-font-family: 'Geist', sans-serif;

  /* Loader theming (modo claro por defecto) */
  --loader-bg: #f5f5f7;
  --loader-primary: #005fef;
  --loader-primary-soft: #005fef55;
  --loader-text: #111827;
  --loader-message: #4b5563;
}

[data-bs-theme="dark"] {
  /* Loader en modo oscuro */
  --loader-bg: #050816;
  --loader-primary: #00c3ff;
  --loader-primary-soft: #00c3ff55;
  --loader-text: #f9fafb;
  --loader-message: #cdefff;
}

.text-overlay-login {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: #fff;
}

.hero-text-login {
  font-size: clamp(2rem, 4vw, 3.5rem);
  margin: 0;
  line-height: 1.1;
}

.letter-login {
  display: inline-block;
  opacity: 0;
  transition: transform 0.6s ease, opacity 0.6s ease;
}

.from-bottom-login {
  transform: translateY(70px);
}

.from-top-login {
  transform: translateY(-70px);
}

.enter-login {
  transform: translateY(0);
  opacity: 1;
}

.exit-top-login {
  transform: translateY(-70px);
  opacity: 0;
}

.exit-bottom-login {
  transform: translateY(70px);
  opacity: 0;
}

.subtitle-login {
  margin-top: 1rem;
  font-size: clamp(1rem, 2vw, 1.4rem);
  max-width: 600px;
  line-height: 1.4;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-login {
  opacity: 1;
  transform: translateY(0);
}

.fade-out-login {
  opacity: 0;
  transform: translateY(10px);
}

.text-wrapper-login {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 80%;
}

.login-error-msg {
  min-height: 22px;
  margin-top: 6px;
  font-size: 0.9rem;
  color: #dc3545;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.login-error-msg.show {
  opacity: 1;
}

/* ============================= */
/*        LOADER OVERLAY         */
/* ============================= */

#loader-overlay {
  position: fixed;
  inset: 0;
  background: var(--loader-bg);
  z-index: 999999;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  opacity: 1;
  transition: opacity 1s ease;
}

#loader-overlay.hide {
  opacity: 0;
  pointer-events: none;
}

/* ============================= */
/*         CONTENEDOR            */
/* ============================= */

.loader-content {
  text-align: center;
  width: 100%;
  max-width: 700px;
  padding: 20px;
  color: #ffffff;
}

/* ============================= */
/*         EDIFICIOS             */
/* ============================= */

.city-lines {
  width: 100%;
  height: 220px;
}

#city-path {
  stroke: var(--loader-primary); /* azul / acento */
  stroke-width: 2.5;
  fill: none;
  stroke-linecap: round;

  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;

  filter: drop-shadow(0 0 6px var(--loader-primary-soft));
}

/* ============================= */
/*      VENTANAS ENCENDIDAS      */
/* ============================= */

.window {
  fill: var(--loader-primary);
  opacity: 0;
  animation: windowBlink 2s infinite;
}

@keyframes windowBlink {
  0%, 100% { opacity: 0; }
  50% { opacity: 1; }
}

/* ============================= */
/*            LOGO 3G            */
/* ============================= */

.loader-logo {
  font-size: 6rem;
  letter-spacing: 10px;
  margin-top: 30px;
  font-weight: 700;
  color: var(--loader-primary);
  position: relative;

  animation: energyPulse 2s ease-in-out infinite;
}

/* Micro pulso energético */

@keyframes energyPulse {
  0% {
      text-shadow: 0 0 5px var(--loader-primary-soft);
  }
  50% {
      text-shadow:
          0 0 15px var(--loader-primary),
          0 0 25px var(--loader-primary),
          0 0 40px var(--loader-primary-soft);
  }
  100% {
      text-shadow: 0 0 5px var(--loader-primary-soft);
  }
}

/* ============================= */
/*         MENSAJES              */
/* ============================= */

#loader-message {
  margin-top: 20px;
  font-size: 1.1rem;
  min-height: 24px;
  opacity: 1;
  transition: opacity 0.4s ease;
  color: var(--loader-message);
}

/* ============================= */
/*         RESPONSIVE            */
/* ============================= */

@media (max-width: 768px) {
  .loader-logo {
      font-size: 4rem;
      letter-spacing: 6px;
  }

  .city-lines {
      height: 160px;
  }
}