/* Importación de fuentes e iconos */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css');

:root {
  /* Paleta de colores - Tema verde y negro */
  --primary-color: #2E7D32;
  --primary-light: #4CAF50;
  --primary-dark: #1B5E20;
  --primary-accent: #81C784;
  --primary-glow: rgba(76, 175, 80, 0.4);

  --text-color: #ffffff;
  --text-light: #e0e0e0;
  --background: #121212;
  --surface: rgba(30, 30, 30, 0.95);
  --on-surface: #ffffff;
  --on-background: #ffffff;

  /* Estados y feedback */
  --error-bg: rgba(239, 83, 80, 0.15);
  --error-text: #EF5350;
  --error-glow: rgba(239, 83, 80, 0.3);
  --success-bg: rgba(76, 175, 80, 0.15);
  --success-text: #81C784;
  --success-glow: rgba(76, 175, 80, 0.3);

  /* Elementos UI */
  --border-color: rgba(255, 255, 255, 0.12);
  --divider-color: rgba(255, 255, 255, 0.08);
  --button-text: #ffffff;
  --button-hover: #388E3C;

  /* Sombras y profundidad */
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 16px 50px rgba(0, 0, 0, 0.45);
  --shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.2);
  --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.15);

  /* Efectos especiales */
  --overlay-light: rgba(76, 175, 80, 0.15);
  --overlay-medium: rgba(76, 175, 80, 0.25);
  --glow-intensity: 0.6;

  /* Inputs avanzados */
  --input-bg: rgba(42, 42, 42, 0.7);
  --input-focus-bg: rgba(51, 51, 51, 0.8);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-focus-border: rgba(129, 199, 132, 0.3);
  --input-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  --input-focus-shadow: 0 0 0 4px rgba(76, 175, 80, 0.25);
  --input-transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);

  /* Transiciones */
  --transition-smooth: cubic-bezier(0.65, 0, 0.35, 1);
  --transition-bounce: cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

/* Reset y estilos base */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--background);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--on-background);
  line-height: 1.6;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 1rem;
  overflow-x: hidden;
  background-color: var(--background);
  position: relative;
}

/* Fondo animado con partículas */
.animated-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background-color: var(--primary-accent);
  border-radius: 50%;
  filter: blur(1px);
  opacity: 0.2;
  animation: float-particle 20s infinite linear;
  will-change: transform, opacity;
}

@keyframes float-particle {
  0% {
    transform: translateY(0) translateX(0);
    opacity: 0.1;
  }
  100% {
    transform: translateY(-100vh) translateX(20px);
    opacity: 0;
  }
}

/* Contenedor principal */
.container {
  background: rgba(30, 30, 30, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--on-surface);
  padding: 3rem;
  border-radius: 1.5rem;
  box-shadow: var(--shadow);
  text-align: center;
  width: 90%;
  max-width: 500px;
  border: 1px solid var(--border-color);
  transition: transform 0.4s var(--transition-smooth), box-shadow 0.4s var(--transition-smooth);
  animation: fadeInUp 0.8s var(--transition-smooth) forwards;
  opacity: 0;
  position: relative;
  overflow: hidden;
  will-change: transform, box-shadow;
}

/* Efecto de brillo al hacer hover */
.container::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    to bottom right,
    transparent 45%,
    var(--overlay-light) 50%,
    transparent 55%
  );
  transform: rotate(45deg);
  opacity: 0;
  transition: opacity 0.6s var(--transition-smooth);
}

.container:hover::before {
  opacity: 0.3;
  animation: shine 3s infinite;
}

@keyframes shine {
  0% { transform: rotate(45deg) translateX(-100%); opacity: 0; }
  50% { opacity: 0.3; }
  100% { transform: rotate(45deg) translateX(100%); opacity: 0; }
}

/* Animación de entrada */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.container:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

/* Logo */
.logo {
  width: 180px;
  margin: 0 auto 2.5rem;
  filter: drop-shadow(0 6px 10px rgba(0, 0, 0, 0.4));
  transition: transform 0.4s var(--transition-smooth), filter 0.4s var(--transition-smooth);
  position: relative;
  z-index: 1;
  display: block;
}

.logo:hover {
  transform: scale(1.05);
  filter: drop-shadow(0 8px 15px rgba(76, 175, 80, 0.3));
}

/* Título */
h2 {
  color: var(--primary-light);
  font-size: 2.2rem;
  margin-bottom: 2.5rem;
  font-weight: 700;
  position: relative;
  display: inline-block;
  text-shadow: 0 0 8px var(--primary-glow);
}

h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-light), var(--primary-dark));
  border-radius: 4px;
  box-shadow: 0 0 8px var(--primary-glow);
  transition: width 0.4s var(--transition-smooth), box-shadow 0.4s var(--transition-smooth);
}

h2:hover::after {
  width: 100%;
  box-shadow: 0 0 12px var(--primary-glow);
}

/* Formulario */
form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  z-index: 1;
}

/* Grupos de formulario */
.form-group {
  position: relative;
  margin-bottom: 1.8rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--primary-light);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.5px;
  transition: transform 0.4s var(--transition-smooth), color 0.4s var(--transition-smooth);
  text-align: left;
  padding-left: 1rem;
}

.form-group.focused label {
  transform: translateY(-10px) scale(0.9);
  color: var(--primary-color);
  padding-left: 0;
}

/* Campos de formulario */
.form-control {
  width: 100%;
  padding: 1.2rem 1.8rem 1.2rem 3.5rem;
  border: 1px solid var(--input-border);
  border-radius: 14px;
  background: var(--input-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--on-surface);
  font-size: 1.1rem;
  font-weight: 500;
  box-shadow: var(--shadow-inset);
  transition: var(--input-transition);
  position: relative;
  z-index: 2;
  letter-spacing: 0.3px;
}

.form-control:focus {
  background: var(--input-focus-bg);
  outline: none;
  border-color: var(--primary-light);
  box-shadow: var(--input-focus-shadow);
}

/* Iconos de inputs */
.input-icon {
  position: absolute;
  left: 1.8rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary-light);
  font-size: 1.2rem;
  transition: color 0.3s var(--transition-smooth), transform 0.3s var(--transition-bounce);
}

.form-control:focus ~ .input-icon {
  color: var(--primary-color);
  transform: translateY(-50%) scale(1.1);
}

/* Contenedor de contraseña */
.password-container {
  position: relative;
}

.password-container .form-control {
  padding-right: 4.5rem;
}

/* Botón de mostrar/ocultar contraseña */
.toggle-password {
  position: absolute;
  right: 1.8rem;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  background: rgba(129, 199, 132, 0.15);
  backdrop-filter: blur(5px);
  border: none;
  border-radius: 50%;
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s var(--transition-smooth);
  z-index: 3;
}

.toggle-password:hover {
  background: rgba(129, 199, 132, 0.3);
  color: var(--primary-color);
  transform: translateY(-50%) scale(1.1);
}

/* Placeholder animado */
.form-control::placeholder {
  color: rgba(255, 255, 255, 0.6);
  font-weight: 400;
  transition: transform 0.3s ease, opacity 0.3s ease;
  letter-spacing: 0.5px;
}

.form-control:focus::placeholder {
  transform: translateX(10px);
  opacity: 0.2;
}

/* Línea decorativa */
.form-group::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-light), var(--primary-dark));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--transition-smooth);
  z-index: 1;
}

.form-group:hover::after,
.form-group:focus-within::after {
  transform: scaleX(1);
}

/* Estados de validación */
.form-control.valid {
  background: rgba(76, 175, 80, 0.1);
  border-color: var(--success-text);
}

.form-control.valid ~ .input-icon {
  color: var(--success-text);
}

.form-control.invalid {
  background: rgba(239, 83, 80, 0.1);
  border-color: var(--error-text);
  animation: shake 0.4s cubic-bezier(.36,.07,.19,.97);
}

.form-control.invalid ~ .input-icon {
  color: var(--error-text);
}

@keyframes shake {
  10%, 90% { transform: translateX(-1px); }
  20%, 80% { transform: translateX(2px); }
  30%, 50%, 70% { transform: translateX(-3px); }
  40%, 60% { transform: translateX(3px); }
}

/* Botón de login */
.btn-login {
  padding: 1.2rem;
  background: linear-gradient(to right, var(--primary-light), var(--primary-color));
  color: var(--button-text);
  border: none;
  border-radius: 14px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 4px 20px rgba(76, 175, 80, 0.3);
  margin-top: 1rem;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.btn-login i {
  font-size: 1.2rem;
  transition: transform 0.3s var(--transition-smooth);
}

.btn-login::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, var(--primary-dark), var(--primary-color));
  opacity: 0;
  z-index: -1;
  transition: opacity 0.3s var(--transition-smooth);
}

.btn-login:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(76, 175, 80, 0.4);
}

.btn-login:hover i {
  transform: translateX(3px);
}

.btn-login:hover::before {
  opacity: 1;
}

.btn-login:active {
  transform: translateY(0);
}

/* Estado de carga */
.btn-login.loading {
  color: transparent;
  pointer-events: none;
}

.btn-login.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Alertas */
.alert {
  padding: 1rem;
  border-radius: 12px;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  text-align: left;
  background-color: var(--surface);
  box-shadow: var(--shadow-sm);
  border-left: 4px solid transparent;
  color: var(--on-surface);
  margin-bottom: 1.2rem;
  transition: all 0.3s var(--transition-smooth);
  opacity: 0;
  transform: translateY(10px);
  animation: alertFadeIn 0.4s var(--transition-smooth) forwards;
}

.alert i {
  margin-right: 10px;
  font-size: 1.3rem;
}

@keyframes alertFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Alertas de error */
.alert.error {
  border-left-color: var(--error-text);
  background-color: var(--error-bg);
  color: var(--error-text);
}

/* Alertas de éxito */
.alert.success {
  border-left-color: var(--success-text);
  background-color: var(--success-bg);
  color: var(--success-text);
}

/* Enlaces */
.links {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.links p {
  font-size: 1rem;
  color: var(--text-light);
  font-weight: 500;
  position: relative;
}

.links a {
  color: var(--on-surface);
  text-decoration: none;
  font-weight: 600;
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.5rem;
  border-radius: 6px;
  transition: all 0.3s var(--transition-smooth);
}

.links a i {
  margin-right: 6px;
  font-size: 1rem;
  transition: transform 0.3s var(--transition-smooth);
}

.links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-light), var(--primary-dark));
  border-radius: 2px;
  transition: width 0.3s var(--transition-smooth);
}

.links a:hover {
  color: var(--primary-light);
  background-color: rgba(129, 199, 132, 0.1);
}

.links a:hover i {
  transform: translateX(3px);
}

.links a:hover::after {
  width: 100%;
}

/* Focus states para accesibilidad */
*:focus {
  outline: 2px solid var(--primary-accent);
  outline-offset: 2px;
}

.links a:focus {
  outline: none;
  background-color: rgba(129, 199, 132, 0.2);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 2.5rem;
    border-radius: 1.2rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .form-control {
    padding: 1.1rem 1.5rem 1.1rem 3.2rem;
    font-size: 1rem;
  }
  
  .input-icon {
    left: 1.5rem;
    font-size: 1.1rem;
  }
  
  .toggle-password {
    right: 1.5rem;
    width: 34px;
    height: 34px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 0.5rem;
  }
  
  .container {
    padding: 2rem 1.5rem;
    border-radius: 1rem;
    width: 95%;
  }
  
  .logo {
    width: 150px;
    margin-bottom: 2rem;
  }
  
  h2 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
  }
  
  h2::after {
    height: 3px;
    bottom: -8px;
  }
  
  .form-control {
    padding: 1rem 1.2rem 1rem 2.8rem;
    border-radius: 12px;
  }
  
  .input-icon {
    left: 1.2rem;
    font-size: 1rem;
  }
  
  .toggle-password {
    right: 1.2rem;
    width: 32px;
    height: 32px;
    font-size: 1.1rem;
  }
  
  .form-group label {
    font-size: 0.95rem;
  }
  
  .btn-login {
    font-size: 1rem;
    padding: 1rem;
  }
  
  .links p {
    font-size: 0.95rem;
  }
}

/* Scrollbar personalizada */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--background);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-dark);
}

/* Mejoras de accesibilidad */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Transiciones suaves para elementos interactivos */
a, button, input[type="button"], input[type="submit"], .toggle-password {
  transition: 
    color 0.3s ease,
    background-color 0.3s ease,
    transform 0.3s ease,
    box-shadow 0.3s ease;
}