/* General Styles */
body {
    margin: 0;
    padding: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(to bottom, #000000, #434343); /* Black gradient background */
    font-family: 'Arial', sans-serif;
  }
  
  .wrapper {
    --input-focus: #2d8cf0;
    --font-color: #ffffff; /* White text for better contrast */
    --font-color-sub: #cccccc; /* Light gray for subtext */
    --bg-color: rgba(255, 255, 255, 0.1); /* Semi-transparent background */
    --main-color: #ffffff; /* White for borders and accents */
    border-radius: 15px;
    backdrop-filter: blur(10px); /* Blur effect for glassmorphism */
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2); /* Subtle shadow */
    padding: 20px;
  }
  
  /* 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;
    font-size: 18px;
  }
  
  .card-side::after {
    position: absolute;
    content: 'Sign up';
    left: 70px;
    top: 0;
    width: 100px;
    text-decoration: none;
    color: var(--font-color);
    font-weight: 600;
    font-size: 18px;
  }
  
  .toggle {
    opacity: 0;
    width: 0;
    height: 0;
  }
  
  .slider {
    box-sizing: border-box;
    border-radius: 5px;
    border: 2px solid var(--main-color);
    box-shadow: 4px 4px var(--main-color);
    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: 0 3px 0 var(--main-color);
    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;
    text-align: center;
    transition: transform 0.8s;
    transform-style: preserve-3d;
  }
  
  .toggle:checked ~ .flip-card__inner {
    transform: rotateY(180deg);
  }
  
  .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: rgba(255, 255, 255, 0.1); /* Semi-transparent background */
    gap: 20px;
    border-radius: 15px;
    border: 2px solid var(--main-color);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  }
  
  .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;
    font-size: 28px;
    font-weight: 900;
    text-align: center;
    color: var(--font-color);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3); /* Text shadow for better visibility */
  }
  
  .flip-card__input {
    width: 250px;
    height: 40px;
    border-radius: 5px;
    border: 2px solid var(--main-color);
    background-color: rgba(255, 255, 255, 0.1); /* Semi-transparent input background */
    box-shadow: 4px 4px var(--main-color);
    font-size: 15px;
    font-weight: 600;
    color: var(--font-color);
    padding: 5px 10px 5px 40px; /* Padding for icon */
    outline: none;
    transition: all 0.3s ease;
  }
  
  .flip-card__input::placeholder {
    color: var(--font-color-sub);
    opacity: 0.8;
  }
  
  .flip-card__input:focus {
    border: 2px solid var(--input-focus);
    box-shadow: 0 0 8px var(--input-focus);
  }
  
  .flip-card__btn {
    margin: 20px 0;
    width: 120px;
    height: 40px;
    border-radius: 5px;
    border: 2px solid var(--main-color);
    background-color: var(--bg-color);
    box-shadow: 4px 4px var(--main-color);
    font-size: 17px;
    font-weight: 600;
    color: var(--font-color);
    cursor: pointer;
    transition: all 0.3s ease;
  }
  
  .flip-card__btn:active {
    box-shadow: 0px 0px var(--main-color);
    transform: translate(3px, 3px);
  }
  
  /* Icons */
  .input-icon {
    position: relative;
  }
  
  .input-icon i {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--font-color-sub);
    font-size: 18px;
  }