:root {
    --primary : #f68b1f;
    --primary-dark : #2b3493;
    --primary-light : #f68b1f;
    --grey : #53565A;
    --dark : #171717;
    --light : #DFDFDF;
    --white : #fff;
    --header-height : 60px;
    --content-width : 1280px;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: Saira, sans-serif;
}
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 999;
    transition: box-shadow 250ms linear;
    background: var(--white);

}
header .header-inner {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    padding: 0px 15px;
    height: var(--header-height);
    width: 100%;
    max-width: var(--content-width);
    margin: 0 auto;
}
header .brand-title {
    font-size: 24px;
    color: var(--primary);
    line-height: var(--header-height);
}
header nav {
    display: flex;
}
header nav .spa-link {
    color: var(--primary);
    line-height: var(--header-height);
    padding: 0 15px;
    cursor: pointer;
}
header nav .spa-link:hover {
    background-color: var(--light);
}
section {
    position: sticky;
    top: 0px;
    height: 100vh;
    padding: 80px  25px;
}
@media only screen and (max-width: 600px) {
    header .header-inner {
        flex-direction: column;
        height: auto;
        align-items: center;
    }
    header .brand-title, header .header-inner nav .spa-link {
        line-height: 1;
        padding: 15px;

    }
    section {
        padding: 120px 25px;
    }

}
.product--section {
    width: 100%;
    padding: calc(80px + --header-height) 25px 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: linear-gradient(to bottom, var(--white) 30%, var(--light) 30%);
}
.product--section .product {
    width: 100%;
    max-width: 600px;
}
.product--section .product img {
    width: 100%;
    transform: translateY(-200px);
    opacity: 0;
    animation-name: fade-top;
    animation-duration: 1s;
    animation-fill-mode: forwards;
    animation-timing-function: ease-in-out;
}
.product--section .content {
    width: 100%;
    max-width: 600px;
    opacity: 0;
    animation-name: fade-in;
    animation-delay: 1s;
        animation-duration: 1s;
        animation-fill-mode: forwards;
        animation-timing-function: ease-in-out;

}
.product--section .content h2{
    font-size: 32px;
    color: var(--grey);
    line-height: 1;
}
.product--section .content h3 {
    font-size: 20px;
    color: var(--grey);
    line-height: 1;
    font-weight: 300;
}
.btn {
    display: block;
    margin: 25px auto;
    width: 100%;
    max-width: 200px;
    color: var(--dark);
    border-radius: 4px;

    background: transparent;
    outline: none;
    border: 5px solid var(--dark);

    font-size: 18px;
    font-family: inherit;
    text-transform: uppercase;
    font-weight: bold;
    cursor: pointer;
    transition: background 200ms linear;
}
.btn:hover {
    padding: 5px;
    border: none;
    background: linear-gradient(to right, var(--primary), var(--primary-light));
}
.btn .btn-content {
    background: var(--light);
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: stretch;
    transition: all 200ms linear;
}
.btn:hover .btn-content {
    background: linear-gradient(to right, var(--primary), var(--primary-light));
}
.btn .btn-content .text-gradient {
    color: var(--dark);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 200ms linear;
}
.btn:hover .btn-content .text-gradient {
    background: linear-gradient(to right, var(--light), var(--grey));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
   
}
.buy--section {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background:  var(--primary-dark);
    padding-bottom: 0px;
}
.buy--section .content {
    flex: 1;
    width: 100%;
    max-width: var(--content-width);
    padding: 0px 15px;
    background-color: var(--primary-dark);
}
.buy--section .content h3 {
    color: var(--light);
    font-size: 32px;
    font-weight: 300;
    text-align: center;
}
.buy--section .content p {
    color: var(--light);
    font-size: 18px;
    display: block;
    width: 100%;
    max-width: 600px;
    margin: 25px auto;
}
.buy--section .btn {
    border: 5px solid var(--light);
}
.buy--section .btn:hover {
    border: none;
    background: linear-gradient(to right, var(--light), var(--grey));

}
.buy--section .btn .btn-content {
    background: var(--primary-dark);
}
.buy--section .btn:hover .btn-content {
    background: linear-gradient(to right, var(--light), var(--grey));
}
.buy--section .btn .btn-content .text-gradient {
    color: var(--light);
}
.buy--section .btn:hover .btn-content .text-gradient {
    background: linear-gradient(to right, var(--primary), var(--primary-light));
        background-clip: text;
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
}
.buy--section .product {
    width: 100%;
    max-width: 720px;
    margin: 5px auto;
}
.buy--section .product img {
    display: block;
    width: 100%;
}
footer {
    height: var(--header-height);
    color: var(--light);
}
.mb-1 {
    margin-bottom: 25px;
}
@keyframes fade-top {
    from {
        transform: translateY(-200px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}
@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
    
}