/****************/
/* HERO SECTION */
/****************/
.section-hero {
    padding: 4.8rem 0 9.6rem 0;
    background-image: linear-gradient(#d0ebff, #fff);
    letter-spacing: 0;
}

.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    column-gap: 4.8rem;

    max-width: 130rem;
    margin: 0 auto;

    padding: 0 3.2rem;
}

.hero-img {
    width: 100%;
    /* border-radius: 50%; */
    border: 1px;
}

.hero-description {
    font-size: 2.8rem;
    color: #0f172a;
    font-weight: 500;
    margin-bottom: 6.4rem;
}

.hero-btn {
    display: flex;
    gap: 2.4rem;
}

.btn--cta,
.btn--cta:link,
.btn--cta:visited {
    background-color: #0369a1;
    transition: all 0.3s;
}

.btn--cta:hover,
.btn--cta:active {
    /* text-shadow: 1px 1px 1px #0369a1; */
    background-color: #dbeafe;
    color: #1e293b;
}

/**********************/
/* NAVIGATION SECTION */
/**********************/

.header {
    background-color: #d0ebff;
    display: flex;
    justify-content: space-between;
    align-items: center;

    height: 9.6rem;
    padding: 2.4rem 5.2rem;
    position: relative;
}

.logo {
    height: 7.4rem;
}

.main-nav-list {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 4.8rem;
    margin-right: 2.4rem;
}

.main-nav-link:link,
.main-nav-link:visited {
    display: inline-block;
    text-decoration: none;
    font-family: inherit;
    font-size: 2.2rem;
    color: #1e293b;
    position: relative;

    transition: all 0.3s;
}

.main-nav-link:hover,
.main-nav-link:active {
    text-shadow: 0 0 0.5px #0369a1;
    text-decoration: none;
    font-family: inherit;
}

.main-nav-link--underline:after {
    background: none repeat scroll 0 0 transparent;
    bottom: 0;
    content: "";
    display: block;
    height: 1px;
    left: 50%;
    position: absolute;
    background: #1e293b;
    transition: width 0.3s ease 0s, left 0.3s ease 0s;
    width: 0;
}

.main-nav-link--underline:hover:after {
    width: 100%;
    left: 0;
}

.main-nav-link.nav-cta:link,
.main-nav-link.nav-cta:visited {
    display: inline-block;
    padding: 1.6rem 3.2rem;

    border-radius: 2px;
    border: none;
    color: #dbeafe;
    background-color: #1e293b;

    transition: all 0.3s;
}

.main-nav-link.nav-cta:hover,
.main-nav-link.nav-cta:active {
    background-color: #d0ebff;
    color: #1e293b;
    text-shadow: 0 0 0.65px #ddd;
    box-shadow: inset 0 0 0 3px #111;
}

/* MOBILE NAV */
.toggle-button {
    border: none;
    background-color: #dbeafe;
    cursor: pointer;

    /* position: absolute; */
    top: 3%;
    right: 3%;
    margin-right: 2.4rem;
    display: none;
}

.bar {
    width: 4.8rem;
    height: 4.8rem;
    fill: #1e293b;
}

.bar[name="close"] {
    display: none;
}

/**********************/
/* BACKGROUND SECTION */
/**********************/
.section-background {
    padding: 4.8rem 0 9.6rem 0;
}

.background-details {
    column-gap: 9.6rem;
    row-gap: 3.2rem;
}

.background-specifics {
    text-align: center;
    font-size: 2.4rem;
    /* line-height: 1.3; */
    margin-bottom: 6.4rem;
}

.background-effects {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* .box {
    overflow: hidden;
} */

.background-effects-img {
    width: 100%;
    opacity: 75%;
    transition: all 0.3s;
}

.background-effects-img:hover {
    transform: scale(1.05);
}

.background-effects-title {
    text-align: center;
    font-size: 2.4rem;
    font-weight: 500;
}

/****************************/
/* PROBLEM & CAUSES SECTION */
/****************************/
.section-problem {
    max-width: 175rem;
    margin: 0 auto;
    padding: 4.8rem 6.4rem 9.6rem;
}

.causes-box {
    gap: 3.2rem;
}

.cause-img-box {
    position: relative;
    margin-bottom: 4.8rem;
}

.cause-img {
    width: 100%;
    z-index: -1;
    filter: brightness(60%);
    filter: grayscale(80%);
    opacity: 75%;
}

.cause-description {
    text-align: center;
    font-size: 2.4rem;
}

/*****************************/
/* QUOTES OF LEADERS SECTION */
/*****************************/
.section-quotes {
    padding: 4.8rem 6.4rem 9.6rem;
}

.quotes-container {
    column-gap: 4.8rem;
    row-gap: 4.8rem;
}

.quote-box:not(:last-child) {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 3.2rem 4.8rem;
}

.quote-description {
    font-size: 2.4rem;
    margin-bottom: 2.4rem;
}
.quote-author {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.quote-title {
    font-weight: 400;
    font-size: 1.6rem;
}

/* QUOTE BOX STYLES */
.quote-icon {
    width: 2.4rem;
    height: 2.4rem;
    fill: #1e293b;
    transform: scaleX(-1);
}

/* LAST QUOTE BOX w/ IMAGE */

.quote-box--last {
    grid-column: 1/-1;
    gap: 4.8rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.quote-last {
    grid-column: 1 / 3;
    padding: 3.2rem 0 3.2rem 4.8rem;
}

.author-img {
    width: 100%;
    filter: brightness(60%);
    filter: grayscale(80%);
    opacity: 75%;
}

/**********************/
/* GREY AREAS SECTION */
/**********************/
.section-grey-areas {
    padding: 4.8rem 6.4rem 9.6rem;
}

.complexity-box {
    column-gap: 6.4rem;
    row-gap: 9.6rem;
}

.complexity-img-box {
    align-self: center;
    justify-self: center;
}

.complexity-img {
    width: 95%;
    filter: brightness(60%);
    filter: grayscale(80%);
    opacity: 75%;
}

.text-box-description {
    text-align: center;
    font-size: 2.4rem;
    margin-bottom: 1.6rem;
}

/***********************/
/* TAKE ACTION SECTION */
/***********************/
.section-take-action {
    padding: 4.8rem 6.4rem 9.6rem;
}

.take-action-boxes {
    max-width: 175rem;
    margin: 0 auto;

    column-gap: 4.8rem;
    row-gap: 4.8rem;
    justify-items: center;
}

.take-action-box {
    background-color: rgba(221, 221, 221, 0.4);
    font-size: 2.4rem;
    color: #1e293b;
    padding: 6.4rem 1.2rem 3.2rem;
    text-align: center;
    border-radius: 2px;

    position: relative;
    transition: all 0.3s;
}

.take-action-box:hover {
    transform: scale(1.1);
}

.number-icon {
    position: absolute;
    top: -10%;
    left: 50%;

    transform: translateX(-50%);
    border: 2px solid white;
    border-radius: 50%;
    padding: 0.5rem 2rem;
    background-color: #1e293b;
    color: #fff;
}

/***************/
/* CTA SECTION */
/***************/
.section-cta {
    padding: 0 6.4rem 9.6rem;
}

.cta {
    background-image: linear-gradient(
            rgba(100, 100, 100, 0.2),
            rgba(100, 100, 100, 0.2)
        ),
        url("/img/smog.jpg");
    background-position: center;
    background-size: 100%;
    padding: 4.8rem 6.4rem;

    display: flex;
    flex-direction: column;
    align-items: center;
}

/******************/
/* FOOTER SECTION */
/******************/
.footer {
    padding: 12.8rem 0;
    border-top: 1px solid #eee;
    background-color: rgba(208, 235, 255, 0.5);
}

.grid--footer {
    grid-template-columns: 4fr 4fr 4fr;
    row-gap: 12.8rem;
    column-gap: 12.8rem;
}

.logo-col {
    display: flex;
    flex-direction: column;
}

.footer-logo {
    /* display: inline-block; */
    margin-bottom: 3.2rem;
}

.logo-footer {
    width: 100%;
}

.social-links {
    list-style: none;
    display: flex;
    gap: 2.4rem;
    /* align-self: center; */
    padding-left: 2.4rem;
}

.social-icon {
    height: 2.4rem;
    width: 2.4rem;
    fill: #1e293b;
}

.copyright {
    font-size: 1.4rem;
    line-height: 1.6;
    color: #767676;
    margin-top: auto;
    padding: 1.2rem 1.2rem 3.2rem;
}

.more-information-col,
.resources-col {
    padding: 2.4rem 0;
}

.footer-heading {
    font-size: 2.2rem;
    font-weight: 600;
    margin-bottom: 4rem;
}

.footer-nav {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2.4rem;
}

.footer-link:link,
.footer-link:visited {
    text-decoration: none;
    font-size: 1.6rem;
    color: inherit;
    transition: all 0.3s;
}

.footer-link:hover,
.footer-link:active {
    color: #555;
}