@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600&display=swap');

* {
  box-sizing: border-box;
}

body {
  background: linear-gradient(120deg, #c9d6ff, #e2e2e2);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  font-family: 'Poppins', sans-serif;
}

.container {
  background: #fff;
  border-radius: 15px;
  box-shadow: 0 14px 28px rgba(0,0,0,0.25), 
              0 10px 10px rgba(0,0,0,0.22);
  position: relative;
  overflow: hidden;
  width: 768px;
  max-width: 100%;
  min-height: 500px;
  transition: all 0.6s ease-in-out;
}

.form-container {
  position: absolute;
  top: 0;
  height: 100%;
  transition: all 0.6s ease-in-out;
}

.sign-in-container {
  left: 0;
  width: 50%;
  z-index: 2;
}

.sign-up-container {
  left: 0;
  width: 50%;
  opacity: 0;
  z-index: 1;
}

.container.right-panel-active .sign-in-container {
  transform: translateX(100%);
}

.container.right-panel-active .sign-up-container {
  transform: translateX(100%);
  opacity: 1;
  z-index: 5;
}

form {
  background: #ffffff;
  display: flex;
  flex-direction: column;
  padding: 0 50px;
  height: 100%;
  justify-content: center;
  align-items: center;
  text-align: center;
}

h1 {
  font-weight: bold;
  margin: 0;
}

p {
  font-size: 14px;
  font-weight: 100;
  line-height: 20px;
  letter-spacing: 0.5px;
  margin: 20px 0 30px;
}

.input-box {
  position: relative;
  margin: 10px 0;
  width: 100%;
}

.input-box input {
  width: 100%;
  padding: 12px 35px 12px 15px;
  border: 1px solid #ddd;
  border-radius: 5px;
  outline: none;
}

.input-box i {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: #999;
}

a.forgot {
  font-size: 12px;
  margin: 10px 0;
  color: #333;
}

.btn, .ghost {
  border-radius: 20px;
  border: 1px solid #4b70e2;
  background-color: #4b70e2;
  color: #fff;
  font-size: 14px;
  font-weight: bold;
  padding: 12px 45px;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: transform 80ms ease-in;
  cursor: pointer;
}

.btn:active, .ghost:active {
  transform: scale(0.95);
}

.btn:focus, .ghost:focus {
  outline: none;
}

.ghost {
  background-color: transparent;
  border-color: #fff;
}

.overlay-container {
  position: absolute;
  top: 0;
  left: 50%;
  width: 50%;
  height: 100%;
  overflow: hidden;
  transition: transform 0.6s ease-in-out;
  z-index: 100;
}

.overlay {
  background: linear-gradient(to right, #4b70e2, #67c6ff);
  color: #fff;
  position: relative;
  left: -100%;
  height: 100%;
  width: 200%;
  transform: translateX(0);
  transition: transform 0.6s ease-in-out;
}

.container.right-panel-active .overlay-container {
  transform: translateX(-100%);
}

.container.right-panel-active .overlay {
  transform: translateX(50%);
}

.overlay-panel {
  position: absolute;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 0 40px;
  text-align: center;
  top: 0;
  height: 100%;
  width: 50%;
  transform: translateX(0);
  transition: transform 0.6s ease-in-out;
}

.overlay-left {
  transform: translateX(-20%);
}

.container.right-panel-active .overlay-left {
  transform: translateX(0);
}

.overlay-right {
  right: 0;
  transform: translateX(0);
}

.container.right-panel-active .overlay-right {
  transform: translateX(20%);
}

@media (max-width: 768px) {
  .container {
    width: 100%;
    min-height: 650px;
  }
  .overlay-container {
    display: none;
  }
  .sign-in-container, .sign-up-container {
    width: 100%;
    left: 0;
  }
  .container.right-panel-active .sign-in-container,
  .container.right-panel-active .sign-up-container {
    transform: none;
  }
}