/* ---------------------------------------------------------------------------
   Login screen (Unidad 10)
--------------------------------------------------------------------------- */
.login-screen {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  transition: opacity 0.5s ease;
}

.login-screen--hidden {
  opacity: 0;
  pointer-events: none;
}

.login-card {
  width: 100%;
  max-width: 380px;
  padding: 40px 36px 36px;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.login-card__header {
  text-align: center;
  margin-bottom: 32px;
}

.login-card__title {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  color: #8f7aff;
}

.login-card__subtitle {
  margin: 4px 0 0;
  font-size: 13px;
  color: #888;
}

.login-card__form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.login-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.login-field__label {
  font-size: 12px;
  font-weight: 600;
  color: #555;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.login-field__input {
  width: 100%;
  padding: 10px 14px;
  font-size: 15px;
  color: #222;
  background: #f5f5f5;
  border: 2px solid transparent;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.login-field__input:focus {
  border-color: #4a90d9;
  background: #fff;
}

.login-field__input--error {
  border-color: #e74c3c;
  background: #fdf2f2;
}

.login-error {
  font-size: 13px;
  color: #e74c3c;
  text-align: center;
  min-height: 18px;
  margin: 0;
}

.login-btn {
  width: 100%;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: #4a90d9;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.login-btn:hover {
  background: #3a7cc0;
}

.login-btn:active {
  background: #2d6aa3;
}

.login-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 8px;
}

.login-link {
  font-size: 13px;
  color: #4a90d9;
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: none;
  padding: 0;
}

.login-link:hover {
  text-decoration: underline;
}

.login-card__footer {
  text-align: center;
  margin-top: 24px;
  font-size: 11px;
  color: #aaa;
}

.login-link--reset {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  color: #aaa;
}

.login-link--reset:hover {
  color: #4a90d9;
}

/* ---------------------------------------------------------------------------
   Modal (Unidad 10)
--------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  opacity: 1;
  transition: opacity 0.25s ease;
}

.modal-overlay--hidden {
  opacity: 0;
  pointer-events: none;
}

.modal {
  width: 100%;
  max-width: 360px;
  padding: 28px 28px 24px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  text-align: center;
}

.modal__icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.modal__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: #1a1a2e;
}

.modal__message {
  margin: 0 0 20px;
  font-size: 14px;
  color: #555;
  line-height: 1.5;
}

.modal__btn {
  padding: 10px 28px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: #4a90d9;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.modal__btn:hover {
  background: #3a7cc0;
}

/* ---------------------------------------------------------------------------
   Mobile login adjustments
--------------------------------------------------------------------------- */
@media (max-width: 767px) {
  .login-card {
    margin: 16px;
    padding: 32px 24px 28px;
  }
}