:root {
    --purple-500: hsl(259, 100%, 65%);
    --red-400: hsl(0, 100%, 67%);
    --white: hsl(0, 100%, 100%);
    --grey-100: hsl(0, 0%, 94%);
    --grey-200: hsl(0, 0%, 86%);
    --grey-500: hsl(0, 1%, 44%);
    --black: hsl(0, 0%, 0%);
}

html {
    font-size: 16px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

@font-face {
    font-family: 'Poppins';
    src: url('./assets/fonts/Poppins-Regular.ttf');
    font-weight: 400 800;
}

@font-face {
    font-family: 'Poppins Italic';
    src: url('./assets/fonts/Poppins-Italic.ttf');
    font-weight: 400 800;
}

@font-face {
    font-family: 'Poppins Bold';
    src: url('./assets/fonts/Poppins-Bold.ttf');
    font-weight: 400 800;
}

@font-face {
    font-family: 'Poppins Extra Bold';
    src: url('./assets/fonts/Poppins-ExtraBold.ttf');
    font-weight: 400 800;
}

@font-face {
    font-family: 'Poppins Extra Bold Italic';
    src: url('./assets/fonts/Poppins-ExtraBoldItalic.ttf');
    font-weight: 400 800;
}

body {
    font-family: Poppins, sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-width: 100vw;
    justify-content: center;
    align-items: center;
    background-color: var(--grey-100);
}

main {
    width: clamp(15rem, 80%, 40rem);
    background-color: var(--white);
    padding: 3rem 2rem;
    border-radius: 1rem 1rem 5rem 1rem;
}

.form {
    font-family: 'Poppins Bold';
    color: var(--grey-500);
}

.input-section {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
}

.input-container {
    display: flex;
    flex-direction: column;
    width: clamp(5rem, 4.8rem + 2vw, 10rem);
}

.input {
    font-family: 'Poppins Bold';
    color: var(--black);
    font-size: 1rem;
    height: 2.5rem;
    padding-left: 0.5rem;
    border: 0.15rem solid var(--grey-500);
    border-radius: 0.2rem;
    width: 100%;
    cursor: pointer;
    transition: background-color 0.4s ease-out;
}

.input:hover, .input:focus{
    border-color: var(--purple-500);
}

.btn-container {
    margin-top: 2rem;
    display: grid;
    align-items: center;
}

.submit-btn {
    border: 0;
    border-radius: 50%;
    background-color: var(--purple-500);
    color: var(--white);
    z-index: 3;
    padding: 0.8rem;
    cursor: pointer;
    width: clamp(3rem, 2.8rem + 1vw, 4rem);
    height: clamp(3rem, 2.8rem + 1vw, 4rem);
    grid-column: 1;
    grid-row: 1;
    margin-left: 50%;
    transform: translateX(-50%);
    transition: background-color 0.4s ease-out;
}

.submit-btn:hover{
    background-color: var(--black);
}

.submit-btn:active{
    background-color: var(--grey-500);
}

.btn-img {
    max-inline-size: 100%;
    block-size: auto;
}

.divider {
    height: 0.1rem;
    background-color: var(--grey-200);
    width: 100%;
    grid-column: 1;
    grid-row: 1;
}

.result {
    font-size: clamp(3rem, 2.8rem + 0.9vw, 3.4rem);
    font-family: 'Poppins Extra Bold Italic';
}

.output {
    color: var(--purple-500);
}

.error-message {
    font-family: 'Poppins Italic';
    display: none;
    color: var(--red-400);
    margin-top: 0.3rem;
    font-size: 0.8rem;
}

.error {
    border-color: var(--red-400);
}

.label-error{
    color: var(--red-400);
}

/*screen resize style*/
@media screen and (width >= 40rem) {
    .input-section {
        justify-content:flex-start;
        gap: 2rem;
    }
    .submit-btn {
        margin-left: 100%;
        transform: translateX(-100%);
    }
}