:root {
    --strong-cyan: hsl(172, 67%, 45%);
    --very-dark-cyan: hsl(183, 100%, 15%);
    --dark-grayish-cyan: hsl(186, 14%, 43%);
    --grayish-cyan: hsl(184, 14%, 56%);
    --light-grayish-cyan: hsl(185, 41%, 84%);
    --very-light-grayish-cyan: hsl(189, 41%, 97%);
    --white: hsl(0, 0%, 100%);
    --fw-700: 700;
}

/* reset */
*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
}

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
}

/* constructor style */
body {
    background-color: var(--light-grayish-cyan);
    font-family: 'Space Mono', sans-serif;
}

main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    gap: 4rem;
}

.card {
    display: grid;
    grid-template-columns: minmax(100px, 0.6fr) minmax(100px, 0.5fr);
    background-color: var(--white);
    border-radius: 1.2rem;
    padding: 1.5rem;
}

.card-box {
    display: flex;
    flex-direction: column;
}

.left-box {
    gap: 2rem;
    padding: 0.5rem 1rem;
}

.right-box {
    background-color: var(--very-dark-cyan);
    border-radius: 1.2rem;
    display: flex;
    flex-direction: column;
    padding: 0 2rem;
    justify-content: space-around;
}

.show-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}


/* left-card styles */
.left-box label,
.left-box p {
    font-weight: var(--fw-700);
    color: var(--dark-grayish-cyan);
    font-size: 0.9rem;
}

.inputs input {
    background-image: url(images/icon-dollar.svg);
    background-repeat: no-repeat;
    background-position: left 15px center;
    background-color: var(--very-light-grayish-cyan);
    background-size: 10px;
    border: none;
    padding: 0.3rem;
    max-width: 100%;
    width: 90%;
    margin: 0.3rem 0;
    border-radius: 0.3rem;
    font-family: 'Space Mono', sans-serif;
    color: var(--very-dark-cyan);
    text-align: right;
    font-weight: var(--fw-700);
    font-size: 1.2rem;
}

.people-box input {
    background-image: url(images/icon-person.svg);
}

input[type=number]:focus {
    text-align: right;
    outline: 2px solid hsl(172, 84%, 74%);
    outline-offset: -2px;
    cursor: pointer;
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0.2rem;
}

::-webkit-input-placeholder {
    text-align: right;
    font-size: 1.2rem;
}

#custom-button {
    border: none;
    background-color: var(--very-light-grayish-cyan);
    position: relative;
    width: 6rem;
}

#custom {
    position: absolute;
    right: 0;
    top: 0;
    left: 0;
    bottom: 0;
    border: none;
    background-color: var(--very-light-grayish-cyan);
    border-radius: 0.4rem;
    font-family: 'Space Mono', sans-serif;
    font-weight: var(--fw-700);
    text-align: center;
    font-size: 1.1rem;
    color: var(--very-dark-cyan);
}

#custom::placeholder {
    text-align: center;
    font-size: 1.1rem;
}

.tip-buttons-container p {
    margin-bottom: 0.5rem;
}

.tip-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

button {
    padding: 0.5rem 1.8rem;
    font-size: 1.1rem;
    color: var(--very-light-grayish-cyan);
    background-color: var(--very-dark-cyan);
    border: none;
    border-radius: 0.3rem;
    cursor: pointer;
    font-weight: var(--fw-700);
}

.people-box {
    position: relative;
}

.people-box span {
    display: none;
    position: absolute;
    right: 10%;
    font-weight: var(--fw-700);
    color: rgb(199, 93, 93);
    font-size: 0.8rem;
}

.changeColor {
    background-color: hsl(172, 84%, 74%);
    color: var(--very-dark-cyan);
}

/* right-card style */
.show-content div {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.show-content span {
    display: block;
    color: var(--dark-grayish-cyan);
    font-size: 0.7rem;
    font-weight: var(--fw-700);
}

p {
    color: var(--white);
    font-size: 0.8rem;
    font-weight: var(--fw-700);
}

.total,
.tip {
    font-size: 2.2rem;
    color: var(--strong-cyan);
}

.right-box button {
    padding: 0.4rem;
    text-transform: uppercase;
    background-color: hsla(172, 58%, 50%, 0.269);
    border: none;
    cursor: pointer;
    color: hsla(183, 100%, 15%, 0.587);
    border-radius: 0.4rem;
    font-family: 'Space Mono', sans-serif;
    font-size: 1rem;
    font-weight: var(--fw-700);
}

button:hover {
    background-color: hsl(172, 84%, 74%);
    color: var(--very-dark-cyan);
}

@media(max-width:625px) {
    main {
        gap: 2rem;
    }

    .card {
        grid-template-columns: auto;
        gap: 1rem;
        padding: 1rem;
    }

    .left-box {
        padding-left: 1rem;
        gap: 1.5rem;
    }

    .right-box {
        padding: 1.5rem 1.5rem;
        gap: 1rem;
    }

    .show-content {
        gap: 0.5rem;
    }

    .tip-buttons {
        justify-content: space-between;
        width: 100%;
    }

    .inputs input {
        width: 100%;
    }

    .people-box span {
        right: 0;
    }

}