/* google font */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500&display=swap');

/* variables */
:root {
    /* colors */
    /* color mode HSL(hue, saturation, lightness) */
    --defult-color:hsl(200,4%,60%);
    --active-color: hsl(200,70%,56%);
    --error-color: hsl(353,64%,53%);
    --border-color: hsl(200,4%,64%);
    --text-color: hsl(200,4%,24%);
    --body-color: hsl(0,0%,100%);


    /* font and typography */
    /* 0.5rem = 8px | 1rem = 16px . . . */
    --body-font: 'Montserrat', sans-serif;
    --normal-font-size: 1rem;
    --small-font-size: .813rem;
    --smaller-font-size: .75rem;
}

/* base */
*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body,
input {
    font-size: var(--normal-font-size);
    font-family: var(--body-font);
    color: var(--text-color);
}

body{
    background-color: var(--body-color);
}

/* input frield */
.container {
    height: 100vh;
    margin-inline: 1.5rem;
    display: grid;
    place-items: center;
}

.form {
    width: 100%;
    max-width: 340px;
}

.form__field{
    position: relative;
}

.form__input{
    width: 100%;
    border: 3px solid var(--defult-color);
    padding: 1.4rem 1.4rem 1.4rem 4.5rem;
    border-radius: 4rem;
    outline: none;
    font-weight: 500;
    transition: border-color 0.4s, box-shadow 0.4s;
}

.form__input::placeholder{
    color: var(--text-color);
}

.form__label{
    position: absolute;
    left: 1.5rem;
    top: -.65rem;
    background-color: var(--body-color);
    padding: 2px;
    font-size: var(--small-font-size);
    font-weight: 500;
}

.form__icon{
    height: max-content;
    font-size: 1.5rem;
    position: absolute;
    left: 1.5rem;
    /* top + bottom = 0 hast va age margin-block ro auto konim be tor barabar margin migire
    va miad vasat */
    top: 0;
    bottom: 0;
    margin-block: auto;
}

.form__field::after{
    content: '';
    position: absolute;
    height: 28px;
    border: 1px solid var(--border-color);
    left: 3.75rem;
    top: 0;
    bottom: 0;
    margin-block: auto;
}

.form__error{
    position: absolute;
    left: 1.5rem;
    bottom: -1.5rem;
    display: flex;
    /* vaghti display flex gharar midim va bad align-item ro mibarim center mizarim icon
     miad vasat */
    align-items: center;
    column-gap: .25rem;
    color: var(--error-color);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s;
}

.form__error i {
    font-size: 1rem;
}

.form__error span {
    font-size: var(--smaller-font-size);
    font-weight: 500;
}

/* active focus & valid field color */

.form__input:focus,
.valid .form__input{
    border-color: var(--active-color);
    box-shadow: 0 8px 24px hsla(200,70%,56%, 0.3);
}

.invalid .form__input{
    border-color: var(--error-color);
    box-shadow: 0 8px 24px hsla(353, 64%,53%, 0.3);
}

.invalid .form__error{
    opacity: 1;
}