@import url('https://fonts.googleapis.com/css2?family=Antonio:wght@100..700');

@font-face {
  font-family: "SpartanMB"; 
  src: url("./assets/fonts/SpartanMB-Regular.otf") format("opentype");
  font-weight: normal;
  font-style: normal;
}

@font-face {
  font-family: "SpartanMB"; 
  src: url("./assets/fonts/SpartanMB-Bold.otf") format("opentype");
  font-weight: bold;
  font-style: normal;
}

:root {
    --neutral-950: #000000;
    --neutral-500: #979797;
    --neutral-300: #d8d8d8;
    --neutral-0: #ffffff;
    --aqua-100: #b1d5e2;
    --aqua-50: #def4fc;
    --navy-950: #070724;
    --teal-400: #1ec1a2;
    --purple-600: #6d2ed5;
    --bronze-700: #bb7d43;
    --red-500: #d83a34;
    --orange-600: #d14c32;
    --amber-400: #EDA249;
    --blue-600: #2d68f0;
    --sky-400: #419ebb;

    --ff-primary: "SpartanMB", sans-serif;
    --ff-heading: "Antonio", sans-serif;
}

.mercury { --accent-color: var(--sky-400); }
.venus { --accent-color: var(--amber-400); }
.earth { --accent-color: var(--purple-600); }
.mars { --accent-color: var(--orange-600); }
.jupiter { --accent-color: var(--red-500); }
.saturn { --accent-color: var(--bronze-700); }
.uranus { --accent-color: var(--teal-400); }
.neptune { --accent-color: var(--blue-600); }

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

html {
    font-family: var(--ff-primary);
    font-size: 62.5%;
}

body {
    background-color: var(--navy-950);
    color: var(--neutral-0);
    font-size: 1.6rem;
    width: 100%;
    min-height: 100vh;
    background-image: url("./assets/background-stars.svg");
}

a {
    text-decoration: none;
}

ul {
    list-style-type: none;
}

button {
    border: none;
    font-family: var(--ff-primary);
}

.page-header {
    padding-block: 2.4rem;
    border-bottom: 1px solid #97979750;
    position: relative;
}

.header-content {
    width: 90vw;
    max-width: 128rem;
    margin-inline: auto;
}

.logo-mobileNavBtn-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    font-size: 2.8rem;
    font-family: var(--ff-heading);
    line-height: 130%;
    letter-spacing: -1px;
    color: var(--neutral-0);
    text-transform: uppercase;
}

.mobile-nav-btn {
    background-color: transparent;
    opacity: .25;
}

.page-nav {
    position: absolute;
    left: 0;
    bottom: 0;
    transform: translateY(calc(100% + 1px));
    background-color: var(--navy-950);
    width: 100%;
    padding-inline: 2.4rem;
    padding-block: 1.6rem;
    display: none;
    overflow: hidden;
    z-index: 10;
}

.page-nav.open {
    display: block;
}

.page-nav-list{
    display: flex;
    flex-direction: column;
}

.page-nav-list li {
    display: flex;
    align-items: center;
    gap: 2rem;
    border-bottom: 1px solid #97979750;
}

.page-nav-list li:last-child {
    border-bottom: none;
}

.planet-clr {
    width: 2rem;
    height: 2rem;
    border-radius: 100vmax;
    background-color: var(--accent-color);
}

.page-nav-link {
    display: block;
    color: var(--neutral-300);
    text-transform: uppercase;
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 165%;
    letter-spacing: 1.35px;
    padding-block: 2.4rem;
}

.planet-details-section {
    padding-block: 2.4rem 6rem;
}

.content {
    width: 90vw;
    max-width: 111rem;
    margin-inline: auto;
}

.main-content-wrapper {
    display: grid;
    grid-template-columns: 1fr;
}

.planet-img-wrapper {
    order: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 30rem;
    position: relative;
}

.planet-img {
    width: 14rem;
    display: block;
}

.saturn-img {
    width: 24rem;
}

.geology-img {
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translate(-50%, -10%);
    width: 8rem; 
}

.planet-info-content {
    order: 2;
    text-align: center;
    margin-top: 2rem;
}

.planet-name {
    font-family: var(--ff-heading);
    font-size: 4rem;
    font-weight: normal;
    text-transform: uppercase;
    line-height: 130%;
    letter-spacing: -1.5px;
    margin-bottom: 1.6rem;
}

.planet-description {
    line-height: 200%;
    font-size: 1.5rem;
    letter-spacing: 0;
    margin-bottom: 3.2rem;
}

.source-link {
    color: var(--neutral-500);
    font-size: 1.4rem;
    line-height: 180%;
}

.source-link a {
    font-weight: bold;
    color: var(--neutral-500);
    text-decoration: underline;
    margin-inline: .5rem;
    }

.planet-internal-links-wrapper {
    order: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #97979750;
}

.internal-link-btn {
    padding-inline: .5rem;
    background-color: var(--navy-950);
    color: var(--neutral-0);
    font-size: 1.2rem;
    font-weight: bold;
    line-height: 275%;
    letter-spacing: 2px;
    opacity: .5;
}

.internal-link-btn:hover {
    background-color: #313148;
    border-color: transparent;
}

.link-num {
    display: none;
}

.link-heading-first,
.link-heading {
    text-transform: uppercase;
}

.link-heading-first {
    display: none;
}

.active-link-btn {
    opacity: 1;
    border-bottom: 4px solid var(--accent-color);
}

.planet-facts-wrapper {
    margin-top: 2.8rem;
    display: grid;
    grid-template-columns: 1fr;
    row-gap: .8rem;
}

.single-fact {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.1rem 2.4rem;
    border: 1px solid #ffffff50; 
}

.fact-name {
    color: var(--neutral-500);
    font-size: 1.1rem;
    font-weight: bold;
    text-transform: uppercase;
    line-height: 225%;
    margin-bottom: 4px;
}

.fact-value {
    font-family: var(--ff-heading);
    font-size: 2rem;
    line-height: 130%;
    letter-spacing: -.25px;
}

@media screen and (min-width: 52rem) {
    .page-header {
        padding-block: 2.4rem;
        border-bottom: 1px solid #97979750;
        position: relative;
    }

    .header-content {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .mobile-nav-btn {
        display: none;
    }

    .page-nav {
        position: static;
        left: initial;
        bottom: initial;
        transform: translateY(0);
        background-color: transparent;
        width: initial;
        padding-inline: 0;
        padding-block: 0;
        display: initial;
        overflow: hidden;
        z-index: 0;
    }

    .page-nav-list {
        display: flex;
        flex-direction: row;
        gap: 3.2rem;
    }

    .page-nav-list li {
        display: flex;
        align-items: center;
        gap: 0;
        border-bottom: none;
    }

    .planet-clr {
        display: none;
    }

    .page-nav-link {
        opacity: .75;
    }

    .main-content-wrapper {
        display: grid;
        grid-template-columns: 1.1fr 1fr;
        grid-column: auto;
        column-gap: 6.4rem;
    }

    .planet-img-wrapper {
        order: 0;
        height: 45rem;
        grid-column: 1/-1;
    }

    .planet-img {
        width: 18.5rem;
    }

    .saturn-img {
        width: 38rem;
    }

    .geology-img {
        transform: translate(-50%, -20%);
        width: 12rem; 
    }

    .planet-info-content {
        order: 1;
        text-align: left;
    }

    .planet-name {
        font-size: 4.8rem;
        letter-spacing: 0;
        margin-bottom: 2.4rem;
    }

    .planet-description {
        line-height: 200%;
        font-size: 1.5rem;
        margin-bottom: 3.2rem;
    }

    .source-link {
        color: var(--neutral-500);
        font-size: 1.4rem;
        line-height: 180%;

        a {
            font-weight: bold;
            color: var(--neutral-500);
            text-decoration: underline;
            margin-inline: .5rem;
        }
    }

    .planet-internal-links-wrapper {
        order: 2;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        justify-content: center;
        border-bottom: none;
        gap: 1.6rem;
    }

    .internal-link-btn {
        cursor: pointer;
        border: 1px solid #97979750;
        height: 5rem;
        line-height: 210%;
        letter-spacing: 2.5px;
        padding: 1rem 2rem;
        display: flex;
        align-items: center;
        opacity: 1;
    }

    .link-num {
        display: initial;
        opacity: .5;
        margin-right: 1.6rem;
    }

    .link-heading-first {
        display: initial;
    }

    .link-heading {
        margin-left: 1ch;
    }

    .active-link-btn {
        background-color: var(--accent-color);
        border-bottom: none;
        border-color: var(--accent-color);
        opacity: 1;
    }

    .planet-facts-wrapper {
        grid-template-columns: repeat(4, 1fr);
        column-gap: 1.2rem;
        row-gap: 0rem;
    }

    .single-fact {
        flex-direction: column;
        justify-content: start;
        align-items: start;
        padding: 1.3rem 1.5rem;
    }

    .fact-name {
        margin-bottom: 4px;
    }

    .fact-value {
        font-size: 2.4rem;
        line-height: 130%;
        letter-spacing: -1px;
    }
}

@media screen and (min-width: 80rem) {
     .page-header {
        padding-block: 0;
    }

    .header-content {
        flex-direction: row;
        justify-content: space-between;
    }

    .page-nav-list {
        gap: 4rem;
    }

    .page-nav-link {
        display: block;
        font-size: 1.2rem;
        line-height: 210%;
        letter-spacing: 1px;
        padding-block: 2.4rem;
        border-top: 4px solid transparent;
    }

    .page-nav-link:hover {
        border-color: var(--accent-color);
    }

    .planet-details-section {
        padding-block: 14rem 6rem;
    }

    .main-content-wrapper {
        display: grid;
        grid-template-columns: 2fr 1fr;
        grid-column: auto;
        column-gap: 6rem;
        row-gap: 4rem;
    }

     .planet-img-wrapper {
        order: 0;
        grid-column: 1/2;
        grid-row: 1/ span 2;
        height: initial;
        padding: 4rem;
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .planet-img {
        width: 45rem;
        aspect-ratio: 1/1;
        object-fit: contain;
    }

    .saturn-img {
        width: 55rem;
    }

    .geology-img {
        transform: translate(-50%, -5%);
        width: 20rem; 
    }
    
    .planet-info-content {
        order: 0;
        grid-column: 2/-1;
        grid-row: 1/ span 1;
    }

    .planet-name {
        font-size: 8rem;
        letter-spacing: 0;
        margin-bottom: 2.4rem;
    }

    .planet-description {
        line-height: 180%;
        font-size: 1.6rem;
        margin-bottom: 2.4rem;
    }

    .planet-internal-links-wrapper {
        order: 0;
        grid-column: 2/-1;
        grid-row: 2/span 1;
        align-items: stretch;
        justify-content: center;
        border-bottom: none;
        gap: 1.6rem;
    }

    .planet-facts-wrapper {
        margin-top: 8.4rem;
        column-gap: 3rem;
    }
}