/* Importación de fuentes */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

  --text-color: #333333;
  --text-light: #555555;
  --background: #e8f5e9;
  --surface: #ffffff;
  --on-surface: #333333;
  --on-background: #333333;

  /* Estados y feedback */
  --error-bg: rgba(239, 83, 80, 0.15);
  --error-text: #c62828;
  --error-glow: rgba(239, 83, 80, 0.3);
  --success-bg: rgba(76, 175, 80, 0.15);
  --success-text: #2E7D32;
  --success-glow: rgba(76, 175, 80, 0.3);

  /* Elementos UI */
  --border-color: rgba(0, 0, 0, 0.12);
  --divider-color: rgba(0, 0, 0, 0.08);
  --button-text: #ffffff;
  --button-hover: #1B5E20;

  /* Sombras y profundidad */
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.25);
  --shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.1);
  --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.05);

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

  /* Inputs */
  --input-bg: #f9f9f9;
  --input-focus-bg: #ffffff;
  --input-border: #dddddd;
  --input-focus-border: #2E7D32;
  --input-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  --input-focus-shadow: 0 0 0 4px rgba(76, 175, 80, 0.3);
  --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 mejorado */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-color) 10%, var(--primary-light) 90%);
  z-index: -1;
  animation: animateBackground 15s infinite alternate;
  will-change: transform;
  transform-origin: center;
}

@keyframes animateBackground {
  0% {
    transform: scale(1) rotate(0deg);
  }
  50% {
    transform: scale(1.05) rotate(1deg);
  }
  100% {
    transform: scale(1.1) rotate(-1deg);
  }
}

/* Contenedor principal mejorado */
.container {
  background-color: var(--surface);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 2.5rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  text-align: center;
  max-width: 450px;
  width: 95%;
  animation: fadeInUp 0.8s var(--transition-smooth) forwards;
  opacity: 0;
  border: 1px solid var(--border-color);
  transition: transform 0.4s var(--transition-smooth), box-shadow 0.4s var(--transition-smooth);
  will-change: transform, box-shadow;
}

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

/* Animación de entrada mejorada */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Título mejorado */
h2 {
  color: var(--primary-color);
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  font-weight: 700;
  position: relative;
  display: inline-block;
  animation: fadeIn 0.8s var(--transition-smooth) forwards;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-light), var(--primary-color));
  border-radius: 3px;
  transition: width 0.4s var(--transition-smooth);
}

h2:hover::after {
  width: 100%;
}

/* Alertas mejoradas */
.alert {
  padding: 1rem;
  border-radius: 0.8rem;
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  text-align: left;
  animation: fadeIn 0.5s var(--transition-smooth) forwards;
  opacity: 0;
  transform: translateY(10px);
  border-left: 4px solid transparent;
}

.alert.error {
  background-color: #ffebee;
  color: var(--error-text);
  border-left-color: var(--error-text);
}

.alert.message {
  background-color: var(--background);
  color: var(--primary-color);
  border-left-color: var(--primary-color);
}

/* Formulario mejorado */
form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  animation: fadeIn 1s var(--transition-smooth) forwards;
}

/* Grupos de campos mejorados */
.form-group {
  margin-bottom: 1.2rem;
  text-align: left;
  position: relative;
}

label {
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  display: block;
  transition: all 0.3s var(--transition-smooth);
}

/* Campos de entrada mejorados */
input[type="email"],
input[type="text"] {
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--input-border);
  border-radius: 0.8rem;
  font-size: 1rem;
  color: var(--text-color);
  transition: var(--input-transition);
  background-color: var(--input-bg);
  box-shadow: var(--shadow-inset);
}

input[type="email"]:focus,
input[type="text"]:focus {
  border-color: var(--primary-color);
  box-shadow: var(--input-focus-shadow);
  outline: none;
  background-color: var(--input-focus-bg);
}

/* Botón mejorado */
button {
  padding: 1rem;
  background: linear-gradient(to right, var(--primary-color), var(--primary-light));
  color: var(--button-text);
  border: none;
  border-radius: 0.8rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s var(--transition-smooth);
  box-shadow: 0 4px 15px rgba(46, 125, 50, 0.3);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

button::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);
}

button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(46, 125, 50, 0.4);
}

button:hover::before {
  opacity: 1;
}

button:active {
  transform: translateY(0);
}

/* Enlaces mejorados */
p {
  margin-top: 1.2rem;
  font-size: 0.95rem;
  color: var(--text-light);
}

p a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s var(--transition-smooth);
  position: relative;
  padding: 0.2rem 0;
}

p a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width 0.3s var(--transition-smooth);
}

p a:hover {
  color: var(--primary-dark);
}

p a:hover::after {
  width: 100%;
}

/* Efecto de carga */
button.loading {
  color: transparent;
  pointer-events: none;
}

button.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); }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 2rem;
  }
  
  h2 {
    font-size: 1.6rem;
  }
  
  input[type="email"],
  input[type="text"] {
    padding: 0.9rem;
  }
  
  button {
    padding: 0.9rem;
  }
}

@media (max-width: 480px) {
  body {
    padding: 0.5rem;
  }
  
  .container {
    padding: 1.5rem;
    border-radius: 0.8rem;
  }
  
  h2 {
    font-size: 1.4rem;
    margin-bottom: 1.2rem;
  }
  
  input[type="email"],
  input[type="text"] {
    padding: 0.8rem;
    font-size: 0.95rem;
  }
  
  button {
    font-size: 0.95rem;
    padding: 0.8rem;
  }
  
  p {
    font-size: 0.9rem;
  }
}

/* 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;
}

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

button:focus,
input:focus,
a:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--primary-glow);
}