@import url('https://fonts.googleapis.com/css2?family=Poppins&display=swap');
* {
    margin: 0;
    scroll-behavior: smooth;

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

body {
    font-family: "Poppins", sans-serif;
    font-weight: 400;
    font-style: normal;
    font-size: 16px;
    line-height: 1.5;
    color: #645c55;
}

h1 { 
    font-size: 64px;
    line-height: 1.1;
    color: #1b1a1a;
    font-weight: 400;
}
h2 {
    font-size: 39px;
    line-height: 1.08;
    color: #1b1a1a;
    font-weight: 400;
}
h3 {
    font-size: 32px;
    line-height: 1.08;
    color: #1b1a1a;
    font-weight: 400;
}
h4 {
    font-size: 17px;
    line-height: 1.53;
    color: #1b1a1a;
    font-weight: 400;
}
.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 15px;
}
a {
    letter-spacing: 0.03em;
    color: #1b1a1a;
    text-decoration: none;
    transition: color 0.6s;
}
a:hover {
    color: #414141;
}
span {
    font-size: 14px;
    line-height: 1.43;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    text-align: center;
    color: #645c55;
}
img {
    display: block;
    max-width: 100%;
    height: auto;
}
button, .btn, a.btn {
    cursor: pointer;
    text-decoration: none;
    border: 0;
}
.section {padding: 96px;}
.section--tight {padding: 64px 0;}

html,body {overflow-x: hidden;}
.burger-menu {
    display: none;
}
.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 60px;
    width: 80px;
    height: 80px;
    background-color: #7A7A7A;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
    
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}
.back-to-top img {
    height: 50px;
}
.back-to-top.show {
    opacity: 0.6;
    pointer-events: auto;
}