body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center; /* Keskittää vaakasuunnassa */
    align-items: center;     /* Keskittää pystysuunnassa */
    min-height: 100vh;       /* Varmistaa, että body on vähintään näytön korkuinen */
    font-family: sans-serif;
    background-image: radial-gradient(circle, transparent 60%, rgba(0, 0, 0, 0.8) 100%),
     url('https://images.unsplash.com/photo-1470115636492-6d2b56f9146d?w=1920&auto=format&fit=crop&q=80');   
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
} 
.wrapper {
  --input-focus: #2d8cf0;
  --font-color: #fefefe;
  --font-color-sub: #bdbdbd;
  --bg-color: rgba(45, 45, 45, 0.3); /* Lisätty läpinäkyvyyttä alentamalla alfa-arvoa */
  --bg-color-alt: #5c5b5d;
  --main-color: transparent; /* Poistetaan valkoiset ääriviivat asettamalla transparent */
}
/* switch card */
.switch {
  transform: translateY(-200px);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 30px;
  width: 50px;
  height: 20px;
}

.card-side::before {
  position: absolute;
  content: 'Log in';
  left: -70px;
  top: 0;
  width: 100px;
  text-decoration: underline;
  color: var(--font-color);
  font-weight: 600;
}

.card-side::after {
  position: absolute;
  content: 'Sign up';
  left: 70px;
  top: 0;
  width: 100px;
  text-decoration: none;
  color: var(--font-color);
  font-weight: 600;
}
.toggle {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  box-sizing: border-box;
  border-radius: 5px;
  border: 2px solid var(--main-color);
  box-shadow: none; /* Poistetaan varjo */
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-color);
  transition: 0.3s;
}

.slider:before {
  box-sizing: border-box;
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  border: 2px solid var(--main-color);
  border-radius: 5px;
  left: -2px;
  bottom: 2px;
  background-color: var(--bg-color);
  box-shadow: none; /* Poistetaan varjo */
  transition: 0.3s;
}

.toggle:checked + .slider {
  background-color: var(--input-focus);
}

.toggle:checked + .slider:before {
  transform: translateX(30px);
}

.toggle:checked ~ .card-side:before {
  text-decoration: none;
}

.toggle:checked ~ .card-side:after {
  text-decoration: underline;
}

/* card */ 

.flip-card__inner {
  width: 300px;
  height: 350px;
  position: relative;
  background-color: transparent;
  perspective: 1000px;
    /* width: 100%;
    height: 100%; */
  text-align: center;
  transition: transform 0.8s;
  transform-style: preserve-3d;
}

.toggle:checked ~ .flip-card__inner {
  transform: rotateY(180deg);
}

.toggle:checked ~ .flip-card__front {
  box-shadow: none;
}

.flip-card__front, .flip-card__back {
  padding: 20px;
  position: absolute;
  display: flex;
  flex-direction: column;
  justify-content: center;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  background: var(--bg-color); /* Läpinäkyvä harmaa tausta */
  gap: 20px;
  border-radius: 10px;
  border: none; /* Poistetaan ääriviivat */
  box-shadow: none; /* Poistetaan varjo */
  backdrop-filter: blur(10px); /* Lisätty sumeusefekti (blurry) */
  -webkit-backdrop-filter: blur(10px); /* Safari-tuki */
}

.flip-card__back {
  width: 100%;
  transform: rotateY(180deg);
}

.flip-card__form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.title {
  margin: 20px 0 20px 0;
  font-size: 25px;
  font-weight: 900;
  text-align: center;
  color: var(--font-color); /* Muutettu font-coloriin, jos halutaan paremmin näkyvä */
}

.flip-card__input {
  width: 250px;
  height: 40px;
  border-radius: 5px;
  /* Muutettu: valkoiset ääriviivat */
  border: 1px solid #ffffff; 
  /* Muutettu: sama taustaväri kuin lomakkeella */
  background-color: var(--bg-color); 
  box-shadow: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--font-color);
  padding: 5px 10px;
  outline: none;
  box-sizing: border-box; /* Varmistaa, että reunat eivät kasvata kentän kokoa */
}

.flip-card__input::placeholder {
  color: var(--font-color-sub);
  opacity: 0.8;
}

.flip-card__input:focus {
  border: 2px solid var(--input-focus);
}

.flip-card__btn:active, .button-confirm:active {
  box-shadow: none;
  transform: translate(3px, 3px);
}

.flip-card__btn {
  margin: 20px 0 20px 0;
  width: 120px;
  height: 40px;
  border-radius: 5px;
  border: 1px solid #ffffff;
  background-color: var(--bg-color);
  box-shadow: none; /* Poistetaan varjo */
  font-size: 17px;
  font-weight: 600;
  color: var(--font-color);
  cursor: pointer;
}