/**
 * css/login.css — Estilos de la pantalla de autenticación
 * Diseño basado en el AuthScreen del EduSaaS Frontend
 * Requiere: variables.css, components.css
 */

/* ============================================================
   PÁGINA DE LOGIN
   ============================================================ */
.login-page {
  min-height: 100vh;
  background: var(--gradient-hero);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  position: relative;
  overflow: hidden;
}

/* Burbujas decorativas de fondo */
.login-page::before,
.login-page::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  pointer-events: none;
}

.login-page::before {
  width: 400px;
  height: 400px;
  top: -100px;
  right: -100px;
  animation: floatBubble 8s ease-in-out infinite;
}

.login-page::after {
  width: 300px;
  height: 300px;
  bottom: -80px;
  left: -80px;
  animation: floatBubble 10s ease-in-out infinite reverse;
}

@keyframes floatBubble {
  0%, 100% { transform: translateY(0) scale(1); }
  50%       { transform: translateY(-20px) scale(1.05); }
}

/* ============================================================
   CONTENEDOR CARD DE LOGIN
   ============================================================ */
.login-card {
  width: 100%;
  max-width: 420px;
  background: rgba(255,255,255,0.97);
  border-radius: var(--radius-xl);
  box-shadow: 0 30px 80px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.2);
  overflow: hidden;
  animation: cardIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  z-index: 1;
}

@keyframes cardIn {
  from { transform: translateY(30px) scale(0.97); opacity: 0; }
  to   { transform: translateY(0)    scale(1);    opacity: 1; }
}

/* Header de la card con gradiente */
.login-card-header {
  background: var(--gradient-primary);
  padding: var(--space-8) var(--space-6) var(--space-6);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.login-card-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.login-logo {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.15);
  border: 3px solid rgba(255,255,255,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  backdrop-filter: blur(10px);
}

.login-logo img {
  width: 80%;
  height: 80%;
  object-fit: contain;
}

.login-logo-icon {
  font-size: 36px;
  color: #fff;
}

.login-card-header h1 {
  color: #fff;
  font-size: var(--font-size-2xl);
  font-weight: 800;
  margin-bottom: var(--space-1);
  position: relative;
}

.login-card-header p {
  color: rgba(255,255,255,0.85);
  font-size: var(--font-size-sm);
  position: relative;
}

/* ============================================================
   CUERPO DEL FORMULARIO
   ============================================================ */
.login-card-body {
  padding: var(--space-8) var(--space-8);
}

.login-form-group {
  margin-bottom: var(--space-5);
}

.login-form-group label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.login-form-group label i {
  color: var(--color-primary);
  width: 16px;
}

.login-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  color: var(--color-text);
  background: var(--color-bg);
  transition: var(--transition-fast);
  outline: none;
  font-family: var(--font-family);
}

.login-input:focus {
  border-color: var(--color-primary);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(102,126,234,0.12);
}

.login-input::placeholder {
  color: var(--color-text-light);
}

/* Botón principal de login */
.btn-login {
  width: 100%;
  padding: 13px;
  background: var(--gradient-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-family);
  box-shadow: 0 4px 16px rgba(102,126,234,0.4);
  letter-spacing: 0.3px;
}

.btn-login:hover {
  filter: brightness(1.08);
  box-shadow: 0 6px 24px rgba(102,126,234,0.5);
  transform: translateY(-1px);
}

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

/* Enlace para volver */
.login-card-footer {
  padding: var(--space-4) var(--space-8) var(--space-6);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.btn-back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  text-decoration: none;
  transition: var(--transition-fast);
  font-weight: 500;
}

.btn-back-link:hover {
  color: var(--color-primary);
}

/* Mensaje de error */
.login-error {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
  border: 1px solid #fca5a5;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--space-5);
  animation: shakeIn 0.4s ease;
}

@keyframes shakeIn {
  0%   { transform: translateX(-8px); opacity: 0; }
  40%  { transform: translateX(6px); }
  70%  { transform: translateX(-4px); }
  100% { transform: translateX(0); opacity: 1; }
}