#section-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.6);
    border-bottom: 3px solid red;
    z-index: 10;
}

#section-main {
    padding-top: 8rem;
    padding-bottom: 8rem;
    background-image: url(../img/fon-5.jpg);
    background: linear-gradient(to right, rgba(0, 0, 0, 0.29), rgba(252, 250, 250, 0)), url(../img/fon-5.jpg);
    background-size: cover;
}

#section-discount {
    background-image: url(../img/99.jpg);
    background: linear-gradient(to left, rgba(0, 0, 0, 1), rgba(0, 0, 0, 0.2)), url(../img/fon-4.jpg);
    background-size: cover;
}

#section-desc {
    background-image: url(../img/brick-bg.png);
    background-size: cover;
}

#section-work {
    background-image: url(../img/dostavka3.jpg);
    background-size: cover;
}

#section-footer {
    background: linear-gradient(to right, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.8)), url(../img/fon4.jpg);
    background-position: left;
    background-size: cover;
}

@media (min-width:576px) {
    #section-footer {
        background-position: center;
    }
}

ul li {
    margin-bottom: 0.5em;
}

header {
    font-size: 2rem;
    padding: 1rem;
    font-weight: bold;
    text-align: center;
}

@media (min-width:576px) {
    .header {
        font-size: 3rem;
        padding: 2rem;
    }
}

header .subheader {
    font-size: 60%;
    font-weight: normal;
}

.c__section {
    padding-top: 3rem;
    padding-bottom: 3rem;
}

.c__shadow {
    box-shadow: 0 0 6px 1px black;
}

.c__shadow_inset {
    box-shadow: inset 0 0 12px black;
}

.text-red {
    color: red;
}

.--fs-150 {
    font-size: 150%;
}

.c__bg_black-t {
    background-color: rgba(0, 0, 0, 0.6);
}

.nav__container {
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav__item {
    color: white;
    margin: 0;
    text-align: center;
}

@media (min-width:768px) {
    .nav__item {
        margin: 2px 6px;
    }
}

.main__title {
    font-size: 2rem;
    text-align: center;
}

h1 {
    font-size: 2rem;
}

.title {
    font-size: 2rem;
}

@media (min-width:576px) {
    .main__title {
        font-size: 3rem;
        text-align: start;
    }
    h1 {
        font-size: 2.5rem;
    }
    .title {
        font-size: 2.5rem;
    }
}

.catalog__card {
    margin-top: 3rem;
    margin-bottom: 3rem;
    background-color: white;
    padding: 1rem;
}

.catalog__price {
    font-size: 1.1rem;
    font-weight: bold;
}

.komplect__item {
    transition: transform 300ms;
}

.komplect__item:hover {
    transform: scale(1.1);
}

.komplect__title {
    font-size: 1.5em;
    font-weight: bold;
}

.komplect__price {
    font-weight: bold;
}

.c__btn {
    display: inline-flex;
    padding: 0.5em 1.5em;
}

.c__btn_block {
    text-align: center;
    display: flex;
}

.c__btn__callback {
    color: white;
    background-color: blue;
    transition: background-color 300ms;
}

.c__btn__callback:hover {
    color: white;
    background-color: red;
    text-decoration: none;
}

.c__link {
    display: none;
    color: white;
}

.c__link:hover {
    color: white;
    text-decoration: none;
}

@media (min-width: 768px) {
    .c__link {
        display: block
    }
}