* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --blue: hsl(233, 26%, 24%);
    --green: hsl(136, 64%, 51%);
    --cyan: hsl(192, 69%, 51%);
    --gray-dark: hsl(233, 8%, 62%);
    --gray-medium: hsl(220, 16%, 96%);
    --gray-light: hsl(0, 0%, 98%);
    --white: hsl(0, 100%, 100%);
    --shadow-soft: 0 20px 40px hsla(233, 26%, 24%, 0.08);
    --radius-card: 1rem;
    --container: min(1120px, calc(100% - 3rem));
}

html {
    scroll-behavior: smooth;
}

body {
    font-size: 18px;
    font-family: "Public Sans", sans-serif;
    background: var(--gray-light);
    color: var(--blue);
    overflow-x: hidden;
}

body.nav-open {
    overflow: hidden;
}

img {
    display: block;
    max-width: 100%;
}

a {
    color: inherit;
}

button {
    font: inherit;
}

.header,
.about,
.article,
.footer {
    width: 100%;
}

.nav-header {
    width: 100%;
    padding: 1.25rem 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--white);
    padding-left: max(1.5rem, calc((100% - 1120px) / 2));
    padding-right: max(1.5rem, calc((100% - 1120px) / 2));
}

.site-nav ul {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.site-nav a {
    text-decoration: none;
    color: var(--gray-dark);
    position: relative;
    transition: color 0.25s ease;
}

.site-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -0.9rem;
    width: 100%;
    height: 0.2rem;
    transform: scaleX(0);
    transform-origin: center;
    background-image: linear-gradient(to right, var(--cyan), var(--green));
    transition: transform 0.25s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
    color: var(--blue);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
    transform: scaleX(1);
}

.btn {
    padding: 1rem 2rem;
    border-radius: 999px;
    color: var(--white);
    border: none;
    background-image: linear-gradient(to right, var(--cyan), var(--green));
    cursor: pointer;
    font-weight: 700;
    transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease;
}

.btn:hover,
.btn:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px hsla(136, 64%, 51%, 0.25);
    filter: brightness(1.05);
}

.menu-icon {
    display: none;
    border: none;
    background: transparent;
    cursor: pointer;
    padding: 0.35rem;
}

.header-main {
    min-height: calc(100vh - 88px);
    background-color: var(--gray-light);
    background-image: url(./images/bg-intro-desktop.svg);
    background-repeat: no-repeat;
    background-position: right -220px top -260px;
    background-size: auto 120%;
}

.header-main-inner {
    width: var(--container);
    margin: 0 auto;
    min-height: inherit;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
    gap: 2rem;
}

.header-main-left,
.header-main-right {
    flex: 1;
}

.header-main-left {
    max-width: 540px;
}

.header-main-left h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--blue);
}

.header-main-left p {
    color: var(--gray-dark);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.header-main-right {
    display: flex;
    justify-content: flex-end;
    align-self: stretch;
}

.header-main-right img {
    width: min(720px, 120%);
    object-fit: cover;
    margin-right: -8rem;
    margin-top: -4rem;
}

.about {
    background: var(--gray-medium);
    padding: 6rem 0;
}

.about-inner {
    width: var(--container);
    margin: 0 auto;
}

.about-head {
    max-width: 660px;
    margin-bottom: 4rem;
}

.about-head h2,
.article-head h2 {
    color: var(--blue);
    font-weight: 400;
    font-size: clamp(2rem, 4vw, 2.5rem);
}

.about-head p {
    color: var(--gray-dark);
    margin-top: 1.5rem;
    line-height: 1.7;
}

.about-wrapper {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.75rem;
}

.about-content {
    min-width: 0;
}

.about-content img {
    margin-bottom: 2rem;
}

.about-content h3 {
    color: var(--blue);
    font-weight: 400;
    margin-bottom: 1.25rem;
}

.about-content p {
    color: var(--gray-dark);
    line-height: 1.7;
}

.article {
    padding: 6rem 0;
    background: var(--gray-light);
}

.article-inner {
    width: var(--container);
    margin: 0 auto;
}

.article-head h2 {
    margin-bottom: 3rem;
}

.article-wrapper {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.75rem;
}

.article-content {
    background: var(--white);
    border-radius: var(--radius-card);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.article-content:hover,
.article-content:focus-within {
    transform: translateY(-6px);
    box-shadow: 0 24px 40px hsla(233, 26%, 24%, 0.12);
}

.article-content img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
}

.article-content > div {
    padding: 1.5rem;
}

.article-content .name {
    color: var(--gray-dark);
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.article-content h3 {
    color: var(--blue);
    margin-bottom: 1rem;
    font-weight: 600;
    font-size: 1.1rem;
    line-height: 1.4;
}

.desc {
    color: var(--gray-dark);
    font-size: 0.95rem;
    line-height: 1.7;
}

.footer {
    background: var(--blue);
    color: var(--white);
    padding: 3rem 0;
}

.footer-inner {
    width: var(--container);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.footer-left,
.footer-right {
    flex: 1;
}

.footer-left {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
}

.footer-logo-icons > img {
    margin-bottom: 2rem;
}

.footer-logo-icons ul {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    list-style: none;
}

.footer-logo-icons a img {
    transition: transform 0.25s ease, filter 0.25s ease;
}

.footer-logo-icons a:hover img,
.footer-logo-icons a:focus-visible img {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.footer-left-link,
.footer-right-link {
    list-style: none;
}

.footer-left-link li,
.footer-right-link li {
    margin-bottom: 0.75rem;
}

.footer-left-link a,
.footer-right-link a {
    color: var(--gray-light);
    text-decoration: none;
    transition: color 0.25s ease;
}

.footer-left-link a:hover,
.footer-left-link a:focus-visible,
.footer-right-link a:hover,
.footer-right-link a:focus-visible {
    color: var(--green);
}

.footer-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 1rem;
    text-align: right;
}

.footer-right p,
.attribution {
    color: hsl(220, 16%, 80%);
}

@media (max-width: 1024px) {
    :root {
        --container: min(1120px, calc(100% - 2.5rem));
    }

    .header-main {
        background-position: right -340px top -170px;
        background-size: auto 110%;
    }

    .header-main-inner {
        gap: 1rem;
    }

    .header-main-right img {
        width: min(620px, 125%);
        margin-right: -4rem;
        margin-top: -1rem;
    }

    .about-wrapper,
    .article-wrapper {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-inner,
    .footer-left {
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    :root {
        --container: min(1120px, calc(100% - 2rem));
    }

    .nav-header > .btn {
        display: none;
    }

    .menu-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        z-index: 30;
    }

    .site-nav {
        position: fixed;
        inset: 72px 0 0;
        padding: 1.5rem 1rem 2rem;
        background: linear-gradient(to bottom, hsla(233, 26%, 24%, 0.72), hsla(233, 26%, 24%, 0.1));
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: opacity 0.25s ease, visibility 0.25s ease;
    }

    .site-nav.is-open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

    .site-nav ul {
        width: min(420px, 100%);
        margin: 0 auto;
        padding: 1.75rem;
        border-radius: 1rem;
        background: var(--white);
        display: grid;
        gap: 1.25rem;
        box-shadow: var(--shadow-soft);
    }

    .site-nav a {
        color: var(--blue);
        font-weight: 500;
    }

    .site-nav a::after {
        display: none;
    }

    .header-main {
        min-height: auto;
        background-image: url(./images/bg-intro-mobile.svg);
        background-position: center top -60px;
        background-size: 100% auto;
    }

    .header-main-inner {
        grid-template-columns: 1fr;
        gap: 0;
        padding-bottom: 4rem;
    }

    .header-main-right {
        order: -1;
        justify-content: center;
    }

    .header-main-right img {
        width: min(100%, 560px);
        margin: -6.5rem 0 0;
    }

    .header-main-left {
        max-width: 100%;
        text-align: center;
        margin-top: -0.5rem;
    }

    .header-main-left p {
        max-width: 620px;
        margin-left: auto;
        margin-right: auto;
    }

    .about,
    .article {
        padding: 4.5rem 0;
    }

    .about-head,
    .article-head {
        text-align: center;
        margin-left: auto;
        margin-right: auto;
    }

    .footer-inner,
    .footer-left {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-right {
        align-items: center;
        text-align: center;
    }
}

@media (max-width: 540px) {
    body {
        font-size: 16px;
    }

    .nav-header {
        padding-top: 1rem;
        padding-bottom: 1rem;
    }

    .header-main {
        background-position: center top -20px;
        background-size: 100% auto;
    }

    .header-main-right img {
        margin-top: -5rem;
    }

    .header-main-left h1 {
        font-size: 2.25rem;
    }

    .about-wrapper,
    .article-wrapper {
        grid-template-columns: 1fr;
    }

    .about-content,
    .article-content {
        text-align: center;
    }

    .about-content img {
        margin-left: auto;
        margin-right: auto;
    }

    .footer {
        padding: 2.5rem 0;
    }
}

@media (max-width: 375px) {
    :root {
        --container: calc(100% - 1.5rem);
    }

    .site-nav {
        inset: 68px 0 0;
        padding: 1rem 0.75rem 1.5rem;
    }

    .site-nav ul {
        padding: 1.5rem 1.25rem;
    }

    .header-main-left h1 {
        font-size: 2rem;
    }

    .header-main-left p,
    .about-head p,
    .about-content p,
    .desc {
        line-height: 1.6;
    }

    .article-content > div {
        padding: 1.25rem;
    }
}