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

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: #010208;
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    overflow-x: hidden;
}


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

.space-quiz-page {

    position: relative;

    min-height: 100vh;

    padding: 65px 20px 100px;

    overflow: hidden;

    background:
        radial-gradient(
            circle at 50% 15%,
            rgba(100,130,255,.17),
            transparent 42%
        ),
        radial-gradient(
            circle at 15% 75%,
            rgba(80,100,220,.09),
            transparent 35%
        ),
        radial-gradient(
            circle at 85% 65%,
            rgba(150,80,255,.07),
            transparent 30%
        ),
        #010208;
}


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

.stars,
.stars-small {

    position: fixed;

    inset: -25%;

    pointer-events: none;

    z-index: 0;
}

.stars {

    opacity: .42;

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

    background-size: 75px 75px;

    transition:
        transform 1.5s ease;
}

.stars-small {

    opacity: .18;

    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: 5;

    max-width: 950px;

    margin: auto;

    text-align: center;
}


.return {

    display: inline-flex;

    align-items: center;

    justify-content: center;

    padding: 12px 20px;

    margin-bottom: 40px;

    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: #010208;

    background: white;

    border-color: white;

    transform:
        translateY(-4px);
}


.label {

    margin-bottom: 18px;

    color:
        rgba(170,190,255,.6);

    font-size: 10px;

    letter-spacing: 6px;
}


h1 {

    margin: 0;

    font-size:
        clamp(43px,8vw,90px);

    line-height: .9;

    letter-spacing: 7px;
}


.subtitle {

    max-width: 760px;

    margin:
        28px auto 0;

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

    font-size: 14px;

    line-height: 1.8;
}


/* =========================================================
   TOPICS
========================================================= */

.topic-line {

    display: flex;

    justify-content: center;

    flex-wrap: wrap;

    gap: 8px;

    margin-top: 25px;
}


.topic {

    padding: 7px 11px;

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

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

    font-size: 7px;

    letter-spacing: 2px;

    transition: .3s ease;
}

.topic:hover {

    color: white;

    border-color:
        rgba(150,180,255,.4);

    background:
        rgba(100,130,255,.05);
}


/* =========================================================
   QUIZ CONTAINER
========================================================= */

.quiz-container {

    position: relative;

    z-index: 5;

    width:
        min(900px,100%);

    margin:
        70px auto 0;

    padding: 35px;

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

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

    backdrop-filter:
        blur(8px);

    box-shadow:
        0 20px 80px
        rgba(0,0,0,.35);

    transition: .8s ease;
}


/* =========================================================
   QUIZ TOP
========================================================= */

.quiz-top {

    display: flex;

    justify-content: space-between;

    align-items: center;

    gap: 15px;

    margin-bottom: 15px;
}


.question-number {

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

    font-size: 9px;

    letter-spacing: 3px;
}


.difficulty {

    padding:
        7px 12px;

    border:
        1px solid
        rgba(255,255,255,.15);

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

    font-size: 8px;

    letter-spacing: 2px;

    transition: .3s ease;
}


/* =========================================================
   PROGRESS
========================================================= */

.progress {

    width: 100%;

    height: 3px;

    margin-bottom: 45px;

    background:
        rgba(255,255,255,.08);

    overflow: hidden;
}


.progress-bar {

    width: 0%;

    height: 100%;

    background: white;

    box-shadow:
        0 0 12px
        rgba(180,200,255,.8);

    transition:
        width .5s ease;
}


/* =========================================================
   QUESTION
========================================================= */

.question {

    min-height: 85px;

    margin-bottom: 35px;

    font-size:
        clamp(20px,3vw,30px);

    line-height: 1.4;

    letter-spacing: .4px;

    animation:
        questionAppear .45s ease;
}

@keyframes questionAppear {

    from {

        opacity: 0;

        transform:
            translateY(12px);
    }

    to {

        opacity: 1;

        transform:
            translateY(0);
    }
}


/* =========================================================
   ANSWERS
========================================================= */

.answers {

    display: grid;

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

    gap: 12px;
}


.answer {

    min-height: 75px;

    padding:
        18px 20px;

    text-align: left;

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

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

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

    font-family:
        Arial,
        Helvetica,
        sans-serif;

    font-size: 12px;

    line-height: 1.5;

    cursor: pointer;

    transition:
        .3s ease;

    animation:
        answerAppear .4s ease both;
}

.answer:nth-child(2) {
    animation-delay: .04s;
}

.answer:nth-child(3) {
    animation-delay: .08s;
}

.answer:nth-child(4) {
    animation-delay: .12s;
}

@keyframes answerAppear {

    from {

        opacity: 0;

        transform:
            translateY(10px);
    }

    to {

        opacity: 1;

        transform:
            translateY(0);
    }
}


.answer:hover {

    color: white;

    border-color:
        rgba(150,180,255,.45);

    background:
        rgba(100,130,255,.06);

    transform:
        translateY(-3px);
}


.answer.correct {

    color: white;

    border-color:
        rgba(100,220,150,.75);

    background:
        rgba(60,180,110,.13);

    box-shadow:
        0 0 20px
        rgba(60,180,110,.08);
}


.answer.wrong {

    color: white;

    border-color:
        rgba(255,90,90,.75);

    background:
        rgba(220,50,50,.13);

    box-shadow:
        0 0 20px
        rgba(220,50,50,.08);
}


.answer.disabled {

    pointer-events: none;
}


/* =========================================================
   NEXT
========================================================= */

.next-area {

    display: flex;

    justify-content: flex-end;

    margin-top: 25px;
}


.next-button {

    display: none;

    padding:
        13px 25px;

    color:
        rgba(255,255,255,.8);

    border:
        1px solid
        rgba(255,255,255,.2);

    background:
        transparent;

    font-family:
        Arial,
        Helvetica,
        sans-serif;

    font-size: 9px;

    letter-spacing: 3px;

    cursor: pointer;

    transition:
        .3s ease;
}


.next-button:hover {

    color: #010208;

    background: white;

    border-color: white;

    transform:
        translateY(-3px);
}


/* =========================================================
   RESULT
========================================================= */

.result {

    display: none;

    position: relative;

    text-align: center;

    min-height: 650px;

    padding:
        25px 10px 20px;

    overflow: hidden;
}


.result::before {

    content: "";

    position: absolute;

    width: 450px;

    height: 450px;

    left: 50%;

    top: 43%;

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

    border-radius: 50%;

    background:
        radial-gradient(
            circle,
            rgba(130,160,255,.22),
            rgba(70,100,230,.07) 38%,
            transparent 70%
        );

    filter: blur(5px);

    animation:
        cosmicGlow 4s ease-in-out infinite;

    pointer-events: none;
}


@keyframes cosmicGlow {

    0%,100% {

        transform:
            translate(-50%,-50%)
            scale(.82);

        opacity: .55;
    }

    50% {

        transform:
            translate(-50%,-50%)
            scale(1.18);

        opacity: 1;
    }
}


/* =========================================================
   COMPLETION ICON
========================================================= */

.completion-icon {

    position: relative;

    width: 110px;

    height: 110px;

    margin:
        5px auto 32px;

    border-radius: 50%;

    background:
        radial-gradient(
            circle,
            #ffffff 0%,
            #dbe6ff 25%,
            #8faeff 55%,
            #5575ff 100%
        );

    box-shadow:
        0 0 25px
        rgba(150,180,255,.8),

        0 0 65px
        rgba(90,120,255,.45),

        0 0 130px
        rgba(60,80,255,.2);

    animation:
        starAppear 1s ease forwards,
        starFloat 4s ease-in-out 1s infinite;

    z-index: 2;
}


.completion-icon::before {

    content: "";

    position: absolute;

    inset: -18px;

    border-radius: 50%;

    border:
        1px solid
        rgba(160,190,255,.45);

    box-shadow:
        0 0 20px
        rgba(130,160,255,.3);

    animation:
        starRing 7s linear infinite;
}


.completion-icon::after {

    content: "";

    position: absolute;

    inset: -32px;

    border-radius: 50%;

    border:
        1px dashed
        rgba(190,210,255,.18);

    animation:
        starRingReverse 12s linear infinite;
}


@keyframes starAppear {

    from {

        opacity: 0;

        transform:
            scale(.2)
            rotate(-60deg);
    }

    to {

        opacity: 1;

        transform:
            scale(1)
            rotate(0);
    }
}


@keyframes starFloat {

    0%,100% {

        transform:
            translateY(0);
    }

    50% {

        transform:
            translateY(-9px);
    }
}


@keyframes starRing {

    from {

        transform:
            rotate(0deg);
    }

    to {

        transform:
            rotate(360deg);
    }
}


@keyframes starRingReverse {

    from {

        transform:
            rotate(360deg);
    }

    to {

        transform:
            rotate(0deg);
    }
}


/* =========================================================
   RESULT TEXT
========================================================= */

.result-label {

    position: relative;

    z-index: 2;

    margin-bottom: 18px;

    color:
        rgba(170,190,255,.65);

    font-size: 10px;

    letter-spacing: 6px;

    animation:
        fadeUp .8s ease .2s both;
}


.result-title {

    position: relative;

    z-index: 2;

    margin-bottom: 12px;

    font-size:
        clamp(32px,7vw,65px);

    letter-spacing: 5px;

    animation:
        titleAppear 1s ease .35s both;
}


@keyframes titleAppear {

    from {

        opacity: 0;

        transform:
            translateY(20px);

        letter-spacing: 15px;
    }

    to {

        opacity: 1;

        transform:
            translateY(0);

        letter-spacing: 5px;
    }
}


.score {

    position: relative;

    z-index: 2;

    margin-bottom: 22px;

    font-size: 27px;

    font-weight: bold;

    letter-spacing: 3px;

    animation:
        fadeUp .8s ease .55s both;
}


.result-text {

    position: relative;

    z-index: 2;

    max-width: 680px;

    margin:
        0 auto 30px;

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

    font-size: 13px;

    line-height: 1.8;

    animation:
        fadeUp .8s ease .7s both;
}


@keyframes fadeUp {

    from {

        opacity: 0;

        transform:
            translateY(15px);
    }

    to {

        opacity: 1;

        transform:
            translateY(0);
    }
}


/* =========================================================
   SCORE BAR
========================================================= */

.final-score-bar {

    position: relative;

    z-index: 2;

    width:
        min(550px,90%);

    height: 4px;

    margin:
        0 auto 35px;

    background:
        rgba(255,255,255,.08);

    overflow: hidden;

    animation:
        fadeUp .8s ease .85s both;
}


.final-score-fill {

    width: 0%;

    height: 100%;

    background: white;

    box-shadow:
        0 0 15px
        rgba(180,200,255,.95);

    transition:
        width 1.8s cubic-bezier(.2,.8,.2,1);
}


/* =========================================================
   RESULT BUTTONS
========================================================= */

.result-buttons {

    position: relative;

    z-index: 2;

    display: flex;

    justify-content: center;

    gap: 12px;

    flex-wrap: wrap;

    animation:
        fadeUp .8s ease 1s both;
}


.result-button {

    padding:
        13px 23px;

    color:
        rgba(255,255,255,.75);

    border:
        1px solid
        rgba(255,255,255,.2);

    background:
        transparent;

    text-decoration: none;

    font-family:
        Arial,
        Helvetica,
        sans-serif;

    font-size: 9px;

    letter-spacing: 2px;

    cursor: pointer;

    transition:
        .3s ease;
}


.result-button:hover {

    color: #010208;

    background: white;

    border-color: white;

    transform:
        translateY(-3px);
}


/* =========================================================
   PARTICLES
========================================================= */

.final-particle {

    position: absolute;

    width: 3px;

    height: 3px;

    border-radius: 50%;

    background: white;

    pointer-events: none;

    opacity: 0;

    animation:
        particleFly 2.5s ease-out forwards;
}


@keyframes particleFly {

    0% {

        opacity: 0;

        transform:
            translate(0,0)
            scale(.2);
    }

    15% {

        opacity: 1;

        transform:
            translate(0,0)
            scale(1);
    }

    100% {

        opacity: 0;

        transform:
            translate(
                var(--x),
                var(--y)
            )
            scale(.2);
    }
}


/* =========================================================
   FOOTER
========================================================= */

.footer {

    position: relative;

    z-index: 5;

    margin-top: 35px;

    text-align: center;

    color:
        rgba(255,255,255,.25);

    font-size: 9px;

    letter-spacing: 4px;
}


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

@media(max-width:600px) {

    .space-quiz-page {

        padding:
            50px 15px 80px;
    }

    .quiz-container {

        padding: 25px;
    }

    .answers {

        grid-template-columns:
            1fr;
    }

    .question {

        font-size: 20px;
    }

    .completion-icon {

        width: 85px;

        height: 85px;
    }

    .result {

        min-height: 600px;
    }

    .topic-line {

        display: none;
    }

}