/*
 * login.css
 * ---------
 * - Maquetar layout de pagina de login centrado vertical y horizontalmente con CSS Grid
 * - Construir fondo con cuadricula de puntos animada heredada del sistema de diseno
 * - Construir card de formulario con efecto glassmorphism sobre fondo oscuro
 * - Estilizar campo de usuario y campo de password con estados: reposo, focus, error y exito
 * - Implementar boton de toggle de visibilidad de password con transicion de icono SVG
 * - Estilizar boton de submit con estado de carga (spinner CSS) y estado deshabilitado
 * - Implementar componente de mensaje de error global con animacion de entrada
 * - Implementar componente de mensaje de exito con animacion de entrada
 * - Estilizar barra de fortaleza de password con cuatro niveles de color
 * - Asegurar que todos los estados de foco sean visibles y accesibles (WCAG AA)
 * - Maquetar link de retorno al inicio y elementos de seguridad decorativos del footer del form
 */

.login-page {
  min-height: 100svh;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-8) var(--space-4);
  padding-top: calc(var(--navbar-height) + var(--space-8));
}

.login-page__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.login-page__bg::before {
  content: '';
  position: absolute;
  inset: -50%;
  background-image: radial-gradient(circle, rgba(45, 107, 228, 0.28) 1px, transparent 1px);
  background-size: 36px 36px;
  animation: grid-drift 28s linear infinite;
  will-change: transform;
}

.login-page__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 70% at 50% 50%, transparent 20%, var(--color-bg-primary) 75%);
}

.login-page__glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(45, 107, 228, 0.08) 0%, transparent 65%);
  z-index: 0;
  pointer-events: none;
}

@keyframes grid-drift {
  0%   { transform: translate(0, 0); }
  25%  { transform: translate(18px, 9px); }
  50%  { transform: translate(18px, 18px); }
  75%  { transform: translate(0, 9px); }
  100% { transform: translate(0, 0); }
}

.login-wrapper {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.login-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  transition: color var(--transition-fast), gap var(--transition-fast);
  width: fit-content;
}

.login-back:hover {
  color: var(--color-text-secondary);
  gap: var(--space-3);
}

.login-back svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.login-back:hover svg {
  transform: translateX(-3px);
}

.login-card {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-lg), 0 0 60px rgba(0, 0, 0, 0.3);
  animation: card-entrance 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@media (min-width: 480px) {
  .login-card {
    padding: var(--space-12);
  }
}

@keyframes card-entrance {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.login-card__header {
  margin-bottom: var(--space-8);
  text-align: center;
}

.login-card__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: var(--color-accent-primary);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-5);
  box-shadow: 0 8px 24px rgba(45, 107, 228, 0.35);
}

.login-card__logo svg {
  width: 28px;
  height: 28px;
}

.login-card__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.login-card__subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.form-label__required {
  color: var(--color-accent-secondary);
  font-size: var(--text-xs);
  line-height: 1;
}

.form-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.form-input {
  width: 100%;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  font-family: var(--font-body);
  padding: var(--space-4) var(--space-5);
  transition: border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.form-input:hover {
  border-color: var(--color-surface-hover);
  background-color: var(--color-bg-tertiary);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  background-color: var(--color-bg-tertiary);
  box-shadow: 0 0 0 3px rgba(45, 107, 228, 0.15);
}

.form-input--with-toggle {
  padding-right: var(--space-12);
}

.form-input--error {
  border-color: var(--color-border-error);
  background-color: rgba(226, 77, 77, 0.04);
}

.form-input--error:focus {
  border-color: var(--color-border-error);
  box-shadow: 0 0 0 3px rgba(226, 77, 77, 0.12);
}

.form-input--success {
  border-color: var(--color-border-success);
}

.form-input--success:focus {
  border-color: var(--color-border-success);
  box-shadow: 0 0 0 3px rgba(0, 201, 167, 0.12);
}

.form-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.form-toggle-btn {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  flex-shrink: 0;
}

.form-toggle-btn:hover {
  color: var(--color-text-secondary);
  background-color: var(--color-bg-tertiary);
}

.form-toggle-btn svg {
  width: 17px;
  height: 17px;
  pointer-events: none;
}

.form-toggle-btn .icon-eye-off {
  display: none;
}

.form-toggle-btn[aria-pressed="true"] .icon-eye {
  display: none;
}

.form-toggle-btn[aria-pressed="true"] .icon-eye-off {
  display: block;
}

.form-error-msg {
  font-size: var(--text-xs);
  color: var(--color-error);
  display: flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 16px;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.form-error-msg.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.form-error-msg svg {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
}

.password-strength {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-1);
}

.password-strength__bar-track {
  display: flex;
  gap: var(--space-1);
  height: 3px;
}

.password-strength__bar-segment {
  flex: 1;
  background-color: var(--color-border-default);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-base);
}

.password-strength__bar-segment.is-active[data-level="1"] { background-color: var(--color-error); }
.password-strength__bar-segment.is-active[data-level="2"] { background-color: var(--color-warning); }
.password-strength__bar-segment.is-active[data-level="3"] { background-color: var(--color-accent-primary); }
.password-strength__bar-segment.is-active[data-level="4"] { background-color: var(--color-success); }

.password-strength__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.password-strength__label[data-strength="1"] { color: var(--color-error); }
.password-strength__label[data-strength="2"] { color: var(--color-warning); }
.password-strength__label[data-strength="3"] { color: var(--color-accent-primary); }
.password-strength__label[data-strength="4"] { color: var(--color-success); }

.form-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.form-checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
}

.form-checkbox {
  width: 18px;
  height: 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-sm);
  appearance: none;
  -webkit-appearance: none;
  flex-shrink: 0;
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  position: relative;
}

.form-checkbox:checked {
  background-color: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
}

.form-checkbox:checked::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 12 10' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 5L4.5 8.5L11 1.5' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 12px 10px;
}

.form-checkbox:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.form-checkbox-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.form-forgot-link {
  font-size: var(--text-sm);
  color: var(--color-accent-primary);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}

.form-forgot-link:hover {
  color: var(--color-accent-hover);
}

.form-alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  line-height: var(--leading-snug);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--transition-base), transform var(--transition-base);
  pointer-events: none;
}

.form-alert.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.form-alert--error {
  background-color: rgba(226, 77, 77, 0.08);
  border: 1px solid rgba(226, 77, 77, 0.25);
  color: #f08080;
}

.form-alert--success {
  background-color: rgba(0, 201, 167, 0.08);
  border: 1px solid rgba(0, 201, 167, 0.25);
  color: var(--color-accent-secondary);
}

.form-alert svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 1px;
}

.form-alert__text {
  flex: 1;
}

.btn-submit {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  background: var(--color-accent-primary);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-base);
  box-shadow: 0 4px 20px rgba(45, 107, 228, 0.3);
  margin-top: var(--space-2);
  min-height: 52px;
  position: relative;
  overflow: hidden;
}

.btn-submit:hover:not(:disabled) {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 8px 28px rgba(45, 107, 228, 0.4);
}

.btn-submit:active:not(:disabled) {
  transform: translateY(0);
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-submit__text {
  transition: opacity var(--transition-fast);
}

.btn-submit__spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: var(--radius-full);
  animation: spinner-rotate 0.7s linear infinite;
  flex-shrink: 0;
}

.btn-submit.is-loading .btn-submit__text {
  opacity: 0;
  position: absolute;
}

.btn-submit.is-loading .btn-submit__spinner {
  display: block;
}

@keyframes spinner-rotate {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.login-card__footer {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  align-items: center;
}

.login-security-badges {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  justify-content: center;
}

.login-security-badge {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.login-security-badge svg {
  width: 12px;
  height: 12px;
  color: var(--color-accent-secondary);
  flex-shrink: 0;
}

.login-security-badge__divider {
  width: 1px;
  height: 12px;
  background-color: var(--color-border-default);
}

.login-contact-note {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
  line-height: var(--leading-relaxed);
}

.login-contact-note a {
  color: var(--color-accent-primary);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.login-contact-note a:hover {
  color: var(--color-accent-hover);
}