/* =========================================
   RESET
========================================= */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: #020308;
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    overflow-x: hidden;
}


/* =========================================
   PAGE
========================================= */

.neptune-page {

    position: relative;

    min-height: 1750px;

    padding: 55px 20px 100px;

    overflow: hidden;

    background:
        radial-gradient(
            circle at 50% 30%,
            rgba(50,90,220,.18),
            transparent 45%
        ),
        #020308;
}


/* =========================================
   STARS
========================================= */

.stars {

    position: absolute;

    inset: -20%;

    pointer-events: none;

    opacity: .38;

    background-image:
        radial-gradient(
            circle,
            rgba(255,255,255,.9) 1px,
            transparent 1px
        );

    background-size: 75px 75px;

    transition:
        transform 1.5s ease;
}


.stars-small {

    position: absolute;

    inset: -20%;

    pointer-events: none;

    opacity: .14;

    background-image:
        radial-gradient(
            circle,
            rgba(255,255,255,.8) 1px,
            transparent 1px
        );

    background-size: 32px 32px;

    transition:
        transform 2s ease;
}


/* =========================================
   HEADER
========================================= */

.header {

    position: relative;

    z-index: 100;

    width: min(950px, 100%);

    margin: auto;

    text-align: center;
}


.return {

    display: inline-flex;

    align-items: center;
    justify-content: center;

    padding: 12px 20px;

    margin-bottom: 35px;

    color:
        rgba(255,255,255,.7);

    border:
        1px solid
        rgba(255,255,255,.22);

    text-decoration: none;

    font-size: 9px;

    letter-spacing: 3px;

    transition:
        .35s ease;
}


.return:hover {

    color: #020308;

    background: white;

    border-color: white;

    transform:
        translateY(-4px);
}


.label {

    margin-bottom: 18px;

    color:
        rgba(255,255,255,.4);

    font-size: 10px;

    letter-spacing: 5px;
}


h1 {

    margin: 0;

    font-size:
        clamp(55px, 9vw, 105px);

    line-height: .9;

    letter-spacing: 7px;
}


.subtitle {

    max-width: 720px;

    margin:
        25px auto 0;

    color:
        rgba(255,255,255,.52);

    font-size: 14px;

    line-height: 1.8;
}


/* =========================================
   NEPTUNE SYSTEM
========================================= */

.planet-area {

    position: relative;

    width: 760px;

    height: 760px;

    margin:
        65px auto 90px;

    display: flex;

    align-items: center;

    justify-content: center;
}


/* =========================================
   ORBITS
========================================= */

.moon-orbit {

    position: absolute;

    left: 50%;
    top: 50%;

    transform:
        translate(-50%, -50%);

    border:
        1px solid
        rgba(80,130,255,.18);

    border-radius: 50%;

    pointer-events: none;
}


.orbit-triton {

    width: 280px;
    height: 280px;
}


.orbit-nereid {

    width: 390px;
    height: 390px;
}


.orbit-proteus {

    width: 500px;
    height: 500px;
}


.orbit-larissa {

    width: 600px;
    height: 600px;
}


.orbit-galatea {

    width: 700px;
    height: 700px;
}


/* =========================================
   NEPTUNE CENTER
========================================= */

.neptune-center {

    position: absolute;

    left: 50%;
    top: 50%;

    transform:
        translate(-50%, -50%);

    z-index: 20;

    width: 195px;
    height: 195px;

    border-radius: 50%;

    text-decoration: none;

    transition:
        .4s ease;
}


.neptune-center img {

    width: 100%;
    height: 100%;

    display: block;

    object-fit: cover;

    border-radius: 50%;

    box-shadow:

        0 0 45px
        rgba(60,100,255,.42),

        0 0 100px
        rgba(30,70,220,.16);

    transition:
        .4s ease;
}


.neptune-center:hover {

    transform:
        translate(-50%, -50%)
        scale(1.08);
}


.neptune-center:hover img {

    box-shadow:

        0 0 60px
        rgba(70,120,255,.6),

        0 0 120px
        rgba(30,70,220,.25);
}


.neptune-center span {

    position: absolute;

    left: 50%;

    bottom: -35px;

    transform:
        translateX(-50%);

    color: white;

    font-size: 10px;

    letter-spacing: 4px;

    white-space: nowrap;
}


/* =========================================
   MOONS
========================================= */

.neptune-moon {

    position: absolute;

    z-index: 30;

    width: 65px;
    height: 65px;

    display: block;

    text-decoration: none;

    transition:
        transform .35s ease;
}


.neptune-moon img {

    width: 100%;
    height: 100%;

    display: block;

    object-fit: cover;

    border-radius: 50%;

    background: #11151a;

    box-shadow:
        0 0 18px
        rgba(120,150,230,.2);

    transition:
        .35s ease;
}


.neptune-moon span {

    position: absolute;

    left: 50%;
    top: 75px;

    transform:
        translateX(-50%);

    color:
        rgba(255,255,255,.65);

    font-size: 8px;

    letter-spacing: 2px;

    white-space: nowrap;

    transition:
        .3s ease;
}


.neptune-moon:hover {

    transform:
        scale(1.18);

    z-index: 50;
}


.neptune-moon:hover img {

    box-shadow:
        0 0 35px
        rgba(130,160,255,.5);
}


.neptune-moon:hover span {

    color: white;
}


/* =========================================
   MOON POSITIONS
========================================= */

.triton {

    left:
        calc(50% + 110px);

    top:
        calc(50% - 140px);
}


.nereid {

    left:
        calc(50% + 145px);

    top:
        calc(50% + 105px);
}


.proteus {

    left:
        calc(50% - 250px);

    top:
        calc(50% - 240px);
}


.larissa {

    left:
        calc(50% - 305px);

    top:
        calc(50% + 95px);
}


.galatea {

    left:
        calc(50% + 285px);

    top:
        calc(50% - 50px);
}


/* =========================================
   INFORMATION
========================================= */

.info {

    position: relative;

    z-index: 5;

    width:
        min(1050px, 100%);

    margin: auto;
}


.info-grid {

    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 1px;

    background:
        rgba(255,255,255,.1);

    border:
        1px solid
        rgba(255,255,255,.1);
}


.card {

    padding: 30px;

    min-width: 0;

    background:
        rgba(5,7,13,.95);

    transition:
        .35s ease;
}


.card:hover {

    transform:
        translateY(-5px);

    background:
        rgba(255,255,255,.04);
}


.number {

    margin-bottom: 8px;

    font-size: 20px;

    font-weight: bold;

    line-height: 1.3;
}


.card-label {

    color:
        rgba(255,255,255,.4);

    font-size: 9px;

    letter-spacing: 2px;

    line-height: 1.5;
}


/* =========================================
   DESCRIPTION
========================================= */

.description {

    margin-top: 60px;

    padding: 40px;

    border:
        1px solid
        rgba(255,255,255,.1);

    background:
        rgba(255,255,255,.025);
}


.description-title {

    margin-bottom: 20px;

    font-size: 11px;

    letter-spacing: 4px;
}


.description-text {

    max-width: 900px;

    color:
        rgba(255,255,255,.58);

    font-size: 14px;

    line-height: 1.9;
}


/* =========================================
   MAJOR MOONS
========================================= */

.moons-title {

    margin-top: 55px;

    margin-bottom: 25px;

    text-align: center;

    font-size: 11px;

    letter-spacing: 5px;

    color:
        rgba(255,255,255,.5);
}


.moons {

    display: grid;

    grid-template-columns:
        repeat(5, 1fr);

    gap: 15px;
}


.moon-card {

    display: block;

    padding: 20px;

    min-width: 0;

    color: white;

    text-decoration: none;

    text-align: center;

    border:
        1px solid
        rgba(255,255,255,.1);

    background:
        rgba(255,255,255,.025);

    transition:
        .35s ease;
}


.moon-card:hover {

    transform:
        translateY(-7px);

    border-color:
        rgba(90,130,255,.5);

    background:
        rgba(255,255,255,.05);
}


.moon-image {

    width: 105px;
    height: 105px;

    margin:
        0 auto 15px;

    display: block;

    object-fit: cover;

    border-radius: 50%;

    background: #10151a;

    box-shadow:
        0 0 25px
        rgba(80,120,240,.14);

    transition:
        .35s ease;
}


.moon-card:hover .moon-image {

    transform:
        scale(1.05);

    box-shadow:
        0 0 35px
        rgba(80,120,240,.28);
}


.moon-name {

    margin-bottom: 8px;

    font-size: 10px;

    letter-spacing: 3px;
}


.moon-description {

    color:
        rgba(255,255,255,.42);

    font-size: 9px;

    line-height: 1.6;
}


/* =========================================
   FEATURES
========================================= */

.features {

    display: grid;

    grid-template-columns:
        repeat(3, 1fr);

    gap: 15px;

    margin-top: 45px;
}


.feature {

    padding: 25px;

    border:
        1px solid
        rgba(255,255,255,.1);

    background:
        rgba(255,255,255,.02);

    transition:
        .35s ease;
}


.feature:hover {

    transform:
        translateY(-6px);

    border-color:
        rgba(90,130,255,.4);
}


.feature-title {

    margin-bottom: 10px;

    font-size: 12px;

    letter-spacing: 2px;
}


.feature-text {

    color:
        rgba(255,255,255,.5);

    font-size: 12px;

    line-height: 1.7;
}


/* =========================================
   FACT
========================================= */

.fact {

    margin-top: 60px;

    padding: 35px;

    text-align: center;

    border:
        1px solid
        rgba(255,255,255,.12);

    background:
        rgba(255,255,255,.025);
}


.fact-label {

    margin-bottom: 15px;

    color:
        rgba(255,255,255,.45);

    font-size: 9px;

    letter-spacing: 4px;
}


.fact-text {

    font-size:
        clamp(18px, 3vw, 27px);

    line-height: 1.5;
}


/* =========================================
   CREDIT
========================================= */

.credit {

    margin-top: 25px;

    text-align: center;

    color:
        rgba(255,255,255,.3);

    font-size: 9px;

    letter-spacing: 1px;

    line-height: 1.6;
}


/* =========================================
   TABLET
========================================= */

@media(max-width:900px) {

    .moons {

        grid-template-columns:
            repeat(2, 1fr);
    }

}


/* =========================================
   MOBILE
========================================= */

@media(max-width:800px) {

    .planet-area {

        width: 450px;

        height: 450px;
    }


    .neptune-center {

        width: 130px;

        height: 130px;
    }


    .orbit-triton {

        width: 180px;

        height: 180px;
    }


    .orbit-nereid {

        width: 250px;

        height: 250px;
    }


    .orbit-proteus {

        width: 320px;

        height: 320px;
    }


    .orbit-larissa {

        width: 400px;

        height: 400px;
    }


    .orbit-galatea {

        width: 490px;

        height: 490px;
    }


    .neptune-moon {

        width: 50px;

        height: 50px;
    }


    .triton {

        left:
            calc(50% + 55px);

        top:
            calc(50% - 90px);
    }


    .nereid {

        left:
            calc(50% + 80px);

        top:
            calc(50% + 55px);
    }


    .proteus {

        left:
            calc(50% - 150px);

        top:
            calc(50% - 160px);
    }


    .larissa {

        left:
            calc(50% - 200px);

        top:
            calc(50% + 75px);
    }


    .galatea {

        left:
            calc(50% + 185px);

        top:
            calc(50% - 40px);
    }


    .info-grid {

        grid-template-columns:
            1fr;
    }


    .features {

        grid-template-columns:
            1fr;
    }

}


/* =========================================
   SMALL MOBILE
========================================= */

@media(max-width:500px) {

    .neptune-page {

        padding:
            45px 15px 70px;
    }


    .header {

        width: 100%;
    }


    .return {

        font-size: 8px;

        letter-spacing: 2px;

        padding:
            11px 15px;
    }


    .label {

        font-size: 8px;

        letter-spacing: 4px;
    }


    h1 {

        font-size:
            clamp(45px, 17vw, 75px);

        letter-spacing: 5px;
    }


    .subtitle {

        font-size: 12px;

        line-height: 1.7;
    }


    .planet-area {

        width: 320px;

        height: 320px;

        margin:
            50px auto 70px;
    }


    .neptune-center {

        width: 95px;

        height: 95px;
    }


    .neptune-center span {

        bottom: -28px;

        font-size: 8px;

        letter-spacing: 3px;
    }


    .orbit-triton {

        width: 135px;

        height: 135px;
    }


    .orbit-nereid {

        width: 180px;

        height: 180px;
    }


    .orbit-proteus {

        width: 230px;

        height: 230px;
    }


    .orbit-larissa {

        width: 285px;

        height: 285px;
    }


    .orbit-galatea {

        width: 315px;

        height: 315px;
    }


    .neptune-moon {

        width: 40px;

        height: 40px;
    }


    .neptune-moon span {

        top: 48px;

        font-size: 7px;

        letter-spacing: 1.5px;
    }


    .triton {

        left:
            calc(50% + 45px);

        top:
            calc(50% - 65px);
    }


    .nereid {

        left:
            calc(50% + 55px);

        top:
            calc(50% + 40px);
    }


    .proteus {

        left:
            calc(50% - 110px);

        top:
            calc(50% - 115px);
    }


    .larissa {

        left:
            calc(50% - 135px);

        top:
            calc(50% + 55px);
    }


    .galatea {

        left:
            calc(50% + 125px);

        top:
            calc(50% - 30px);
    }


    .description {

        padding: 25px;
    }


    .description-text {

        font-size: 13px;

        line-height: 1.8;
    }


    .moons {

        grid-template-columns:
            1fr;
    }


    .moon-card {

        padding: 25px;
    }


    .fact {

        padding: 25px;
    }

}