:root {
    --light-color: #fdfdfd;
    --dark-color: #121212;
    --nav-background-color: #f3f3f2;
    --border-color: #ccc;
    --button-hover-color: #fed62e;
}

html {
    font-size: 10px;
}

body {
    font-family: 'Roboto', sans-serif;
    font-size: 1.6rem;
    background-color: var(--light-color);
    color: var(--dark-color);
    margin: 0;
}

ul,
li {
    margin: 0;
    padding: 0;
}

li {
    list-style: none;
}

a {
    color: var(--dark-color);
    text-decoration: none;
}

#container {
    width: 100%;
    margin: 0 auto;
}

#header {
    position: sticky;
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-wrap: nowrap;
    padding: 2rem 4rem;
    background-color: var(--nav-background-color);
}

@media screen and (min-width: 768px) {
    #header {
        flex-direction: row;
        justify-content: space-between;
    }
}

#header-img {
    width: 100%;
    margin-top: 2rem;
    padding: 0;
}

@media screen and (min-width: 768px) {
    #header-img {
        width: 20%;
        margin: 0;
    }
}

#nav-bar ul {
    display: flex;
    gap: 2rem;
    justify-content: space-between;
    align-items: center;
    flex-wrap: nowrap;
    font-weight: bold;
    margin: 2rem 0;
}

@media screen and (min-width: 768px) {
    #nav-bar ul {
        gap: 6rem;
    }
}

#hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

@media screen and (min-width: 768px) {
    #hero {
        padding: 4rem 0;
    }
}

#hero>h2 {
    margin-bottom: 2rem;
}

#hero input[type='email'] {
    width: 20rem;
    height: 2rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: .5rem;
}

placeholder {
    color: var(--border-color)
}

#hero input[type='submit'] {
    width: 12rem;
    height: 4rem;
    border: 0;
    border-radius: .5rem;
    font-weight: bold;
    color: var(--light-color);
    background-color: var(--dark-color);
    cursor: pointer;
}

@media screen and (min-width: 768px) {
    #hero input[type='submit'] {
        margin: 2rem 0;
    }
}

#hero input[type='submit']:hover {
    background-color: var(--button-hover-color);
    color: #222;
    transition: background-color 1s;
}

@media (max-width: 768px) {
    #hero {
        margin-top: 2rem;
    }
}

.title {
    display: block;
    font-size: 3.6rem;
    text-align: center;
}

@media (max-width: 768px) {
    .title {
        margin: 4rem auto;
    }
}

#features {
    margin: 0 auto;
    text-align: center;
    padding: 0 2rem;
}

@media screen and (min-width: 768px) {
    #features {
        margin: 0 auto;
        width: 50%;
        text-align: justify;
    }
}

#features>h1 {
    margin-bottom: .5rem;
}

#features>p {
    margin-bottom: 4rem;
}

#how-it-works {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#how-it-works>iframe {
    max-width: 640px;
    width: 100%;
    margin-bottom: 4rem;
}

@media screen and (min-width: 768px) {
    #how-it-works>iframe {
        margin-bottom: 6rem;
    }
}

#pricing {
    display: flex;
    flex-direction: column;
    margin: 2rem auto 6rem auto;
    justify-content: center;
    align-items: center;
}

@media screen and (min-width: 768px) {
    #pricing {
        width: 80%;
        flex-direction: row;
    }
}

.product {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border: 1px solid #222;
    max-width: 300px;
    width: 100%;
    margin: 0 auto;
    margin-bottom: 2rem;
}

@media screen and (min-width: 768px) {
    .product {
        width: calc(100% / 3);
        width: 100%;
        margin: 1rem;
    }
}

.product>.level {
    color: #222;
    padding: 2rem 0;
    width: 100%;
    font-weight: bold;
}

.product>h2 {
    margin-top: 2rem;
}

.product>ul {
    margin: 2rem 0;
}

.product>ul>li {
    padding: .5rem 0;
}

.product>button {
    max-width: 100px;
    width: 100%;
    height: 4rem;
    margin: 2rem 0;
    border: 0;
    border-radius: 2rem;
    font-weight: bold;
    color: var(--light-color);
    background-color: var(--dark-color);
    cursor: pointer;
}

.product>button:hover {
    background-color: var(--button-hover-color);
    color: var(--dark-color);
    transition: background-color 1s;
}

footer {
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 4rem;
}

footer>ul {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

@media screen and (min-width: 768px) {
    footer>ul {
        justify-content: flex-end;
    }
}

footer>ul>li {
    font-size: 1.4rem;
    color: var(--light-color);
}

footer>ul>li>a {
    color: var(--light-color);
}

footer>span {
    margin-top: .5rem;
    display: flex;
    justify-content: center;
    font-size: 1.2rem;
}

@media screen and (min-width: 768px) {
    footer>span {
        justify-content: flex-end;
    }
}

::selection {
    background-color: var(--dark-color);
    color: var(--light-color);
}

footer ::selection {
    background-color: var(--light-color);
    color: var(--dark-color);
}