styles.css

:root {
    --Gradients-Light-Magenta: hsl(293, 100%, 63%);
    --Gradients-Light-Violet: hsl(264, 100%, 61%);

    --Primary-Pale-Violet: hsl(276, 100%, 81%);
    /*(sub-heading at the top of the app UI)*/

    --Primary-Moderate-Violet: hsl(276, 55%, 52%);
    /*(chat on the left)*/

    --Primary-Desaturated-Dark-Violet: hsl(271, 15%, 43%);
    /*(chat on the right)*/

    --Primary-Grayish-Blue: hsl(206, 6%, 79%);
    /*(placeholder text)*/

    --Primary-Very-Dark-Desaturated-Violet: hsl(271, 36%, 24%);
    /*(main heading)*/

    --Primary-Dark-Grayish-Violet: hsl(270, 7%, 64%);
    /*(paragraph)*/

    --Secondary-White: hsl(0, 0%, 100%);

    --Secondary-Light-Grayish-Violet: hsl(270, 20%, 96%);
    /*(app background)*/

    --Secondary-Very-Dark-Desaturated-Violet: hsl(271, 36%, 24%);
    /*(submit button background)*/

    --Secondary-Very-Light-Magenta: hsl(289, 100%, 72%);
    /*(radio button outline)*/
}

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

:focus {
    outline: 2px dotted currentColor;
}

body {
    font-size: 16px;
    font-family: 'Rubik', sans-serif;
    background-color: var(--Secondary-Light-Grayish-Violet);
}

.top-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    row-gap: 3rem;
    margin: auto;
    padding: 3rem 1rem;
    width: 100%;
    max-width: 1440px;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

/* ========= Smartphone designs ========= */

img {
    width: 100%;
    vertical-align: middle;
}

.phone-container {
    max-width: 15rem;
    border: 0.6rem solid var(--Secondary-White);
    border-radius: 30px;
    position: relative;
    overflow: hidden;
    background-color: var(--Secondary-Light-Grayish-Violet);
    -webkit-box-shadow: 10px 20px 60px 0px rgba(0, 0, 0, 0.19);
    -moz-box-shadow: 10px 20px 60px 0px rgba(0, 0, 0, 0.19);
    box-shadow: 10px 20px 60px 0px rgba(0, 0, 0, 0.19);
}

.top-head-container {
    background-image: linear-gradient(to right, hsl(264, 100%, 61%), hsl(293, 100%, 63%));
    border-radius: 5px;
}

.top-notch {
    position: relative;
    height: 1.3rem;
    width: 8rem;
    background-color: var(--Secondary-White);
    left: 50%;
    top: -2px;
    transform: translateX(-50%);
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
}

.head-content-container {
    display: flex;
    padding: 0.7rem 0.5rem;
    justify-content: flex-start;
    align-items: center;
    color: var(--Secondary-White);
}

.avater-container {
    max-width: 1.5rem;
    border-radius: 50%;
    overflow: hidden;
    border: 1.5px solid var(--Secondary-White);
    margin: 0 0.5rem 0 0.2rem;
}

#back-arrow {
    font-size: 0.625rem;
    font-weight: 900;
}

#more {
    margin-left: auto;
    font-size: 0.8125rem;
    font-weight: 900;
}

.name {
    font-size: 0.7rem;
}

.availibility {
    font-size: 0.6rem;
    color: var(--Primary-Pale-Violet);
}

/* ========= Conversations ========= */

.msg {
    max-width: 68%;
    font-size: 0.6rem;
    margin: 0.5rem;
    border-radius: 10px;
    padding: 0.5rem;
}

.received-msg {
    background-color: hsla(276, 100%, 81%, 0.171);
    color: var(--Primary-Moderate-Violet);
    border-bottom-left-radius: 4px;
}

.sent-msg {
    background-color: var(--Secondary-White);
    box-shadow: 10px 3px 14px -11px rgba(0, 0, 0, 0.29);
    -webkit-box-shadow: 10px 3px 14px -11px rgba(0, 0, 0, 0.29);
    -moz-box-shadow: 10px 3px 14px -11px rgba(0, 0, 0, 0.29);

    color: var(--Primary-Desaturated-Dark-Violet);
    margin-left: auto;
    border-bottom-right-radius: 4px;
}

/* Photos */
.sent-photos-container {
    margin: 0 0.5rem;
    display: flex;
    justify-content: flex-end;
}

.sent-photos-container div {
    max-width: 3rem;
    border-radius: 8px;
    overflow: hidden;
    display: inline-block;
    vertical-align: middle;
    margin-left: 0.5rem;
}

/* ========= Pricing ========= */

.pricing-container {
    font-size: 0.6rem;
    display: flex;
    align-items: center;
    background-image: linear-gradient(to right, hsl(293, 100%, 63%), hsl(264, 100%, 61%));
    margin: 0.5rem;
    padding: 0.5rem 0.5rem;
    border-radius: 8px;
    max-width: 75%;
    color: var(--Secondary-White);
}

.pricing__circle {
    height: 0.8125rem;
    width: 0.8125rem;
    border: 1px solid var(--Secondary-Very-Light-Magenta);
    border-radius: 50%;
    margin-right: 0.625rem;
}

.price {
    font-size: 1rem;
    margin-left: auto;
    margin-right: 0.5rem;
}

/* ========= Text area ========= */

.texting-field {
    background-color: var(--Secondary-White);
    display: flex;
    align-items: center;
    font-size: 0.6rem;
    margin: 1rem 0.5rem 0.5rem;
    padding: 0.3rem;
    border-radius: 15px;
}

.placeholder {
    margin-left: 1rem;
    color: var(--Primary-Grayish-Blue);
}

.send-button {
    margin-left: auto;
    background-color: var(--Secondary-Very-Dark-Desaturated-Violet);
    border-radius: 50%;
    height: 1.5rem;
    width: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

#send-arrow {
    color: var(--Secondary-White);
    font-size: 0.7rem;
    font-weight: 900;
}

.headings {
    text-align: center;
}

.headings h1 {
    margin-bottom: 1rem;
    color: var(--Primary-Very-Dark-Desaturated-Violet);
}

.brief {
    color: var(--Primary-Dark-Grayish-Violet);
    line-height: 1.7;
}

.top-container::before {
    content: "";
    height: 30rem;
    width: 30rem;
    background-image: linear-gradient(to top right, hsl(264, 100%, 61%), hsl(293, 100%, 63%));
    position: absolute;
    top: 0;
    right: 50%;
    border-bottom-left-radius: 50%;
    border-bottom-right-radius: 50%;
    z-index: -1;
}

.top-container::after {
    content: "";
    height: 30rem;
    width: 30rem;
    background-image: linear-gradient(to top right, hsl(264, 100%, 61%), hsl(293, 100%, 63%));
    position: absolute;
    bottom: 0;
    left: 50%;
    border-top-left-radius: 50%;
    border-top-right-radius: 50%;
    z-index: -2;
    opacity: 0.1;
}


@media (min-width: 40rem) {

    .top-container {
        flex-direction: row;
        column-gap: 8%;
    }

    .brief {
        max-width: 28rem;
    }

    .top-container::before {
        right: 73.8%;
    }

    .top-container::after {
        left: 73.8%;
    }

}