:root {
    --font-family-base: 'Rubik', system-ui, -apple-system, sans-serif;
    --space-100: 0.5rem;
    --space-200: 1rem;
    --space-300: 1.5rem;
    --space-400: 2rem;
    --space-600: 3rem;
    --space-800: 8rem;
    --radius-lg: 1.5rem;
    --shadow-elevated: 0 16px 40px 0 rgba(143, 160, 193, 0.14);
    --color-bg-light: #F4F6FA;
    --color-bg-dark: #313E51;
    --color-surface: #FFFFFF;
    --color-text: #313E51;
    --color-text-muted: #626C7F;
    --color-text-on-dark: #FFFFFF;
    --color-text-muted-on-dark: #ABC1E1;
}

html,
body {
    height: 100%;
    /* Fill the screen */
    margin: 0;
    /* Remove default margins */
    overflow: hidden;
    /* KILL the global scrollbar */
    overscroll-behavior: none;
    /* Disables the "bounce" effect on Mac/iOS */
}

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

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-family-base);
    background-color: var(--color-bg-light);
}

main {
    /* Use dynamic viewport height to handle mobile address bars correctly */
    height: 100dvh;
    /* Allow scrolling INSIDE this box */
    overflow-y: auto;
    overflow-x: hidden;
    /* Double safety for the white side problem */
    /* Optional: Make the scroll smooth inside */
    scroll-behavior: smooth;
}

main {
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6.19rem;
    min-height: 100vh;
    width: 100%;
    padding: clamp(2rem, 6vw, 4rem);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: top right;
    color: var(--color-text);
    transition: all 0.5s ease-in-out;
}

main.lightmod {
    --color-text: #313E51;
    --color-text-muted: #626C7F;
    --color-surface: #FFFFFF;
    background-color: var(--color-bg-light);
    background-image: url(./assets/images/pattern-background-desktop-light.svg);
}

main.darkmod {
    --color-text: var(--color-text-on-dark);
    --color-text-muted: var(--color-text-muted-on-dark);
    --color-surface: #3b4d66;
    background-color: var(--color-bg-dark);
    background-image: url(./assets/images/pattern-background-desktop-dark.svg);
    color: var(--color-text);
}

.start-menu {
    display: flex;
    align-items: flex-start;
    width: min(90vw, 72.3125rem);
    gap: var(--space-800);
}

.welcome-section {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-600);
}

.welcome-section p {
    margin: 0;
    padding: 0;
    color: var(--color-text-muted);
    font-size: 1.25rem;
    font-style: italic;
    font-weight: 400;
    line-height: 150%;
}

.welcome-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-100);
}

.welcome-text h1 {
    margin: 0;
    padding: 0;
    color: var(--color-text);
    font-size: 4rem;
    font-style: normal;
    font-weight: 300;
    line-height: 100%;
}

.welcome-text h2 {
    margin: 0;
    padding: 0;
    color: var(--color-text);
    font-size: 4rem;
    font-style: normal;
    font-weight: 500;
    line-height: 100%;
}

.subject-list {
    width: min(48vw, 35.25rem);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-200);
    flex-shrink: 0;
}

.subject-item {
    appearance: none;
    border: 0px;
    width: 100%;
    display: flex;
    padding: var(--space-300);
    align-items: center;
    gap: var(--space-400);
    align-self: stretch;
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-elevated);
    cursor: pointer;
    transition: background-color 0.6s ease;
}

main.darkmod .subject-item {
    background-color: #3b4d66;
}

button.subject-item:hover {
    background-color: rgba(220, 218, 218, 0.687);
}

button.subject-item:focus {
    animation: bottom-down 0.4s ease forwards;
    ;
}

@keyframes bottom-down {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(0.25rem);
    }
    100% {
        transform: translateY(0);
    }
}

.subject-icon-container {
    display: grid;
    place-items: center;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 15%;
}

.subject-icon-container.html {
    background-color: #FFF5ED;
}

.subject-icon-container.css {
    background-color: #E0FDEF;
}

.subject-icon-container.js {
    background-color: #EBF0FF;
}

.subject-icon-container.accessibility {
    background-color: #F6E7FF;
}

.subject-icon {
    width: 2.5rem;
    height: 2.5rem;
}

.subject-name {
    color: var(--color-text);
    font-size: 1.75rem;
    font-style: normal;
    font-weight: 500;
    line-height: 100%;
}

.topic-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: min(90vw, 72.3125rem);
    margin: 0 auto var(--space-400);
    padding: 0 clamp(1rem, 3vw, 1.5rem);
}

.header-content {
    opacity: 0;
    padding: 1px;
}

.header-content.show {
    margin-left: -2rem;
    padding: 0;
    display: flex;
    gap: var(--space-300);
    align-items: center;
    opacity: 100;
}

.header-content .icon-container {
    background-repeat: no-repeat;
    background-position: center;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 0.5rem;
}

.header-content .icon-container.HTML {
    background-image: url('./assets/images/icon-html.svg');
    background-color: #FFF5ED;
}

.header-content .icon-container.CSS {
    background-image: url('./assets/images/icon-css.svg');
    background-color: #E0FDEF;
}

.header-content .icon-container.JavaScript {
    background-image: url('./assets/images/icon-js.svg');
    background-color: #EBF0FF;
}

.header-content .icon-container.Accessibility {
    background-image: url('./assets/images/icon-accessibility.svg');
    background-color: #F6E7FF;
}

.header-content p {
    font-family: Rubik;
    font-size: 1.75rem;
    font-style: normal;
    font-weight: 500;
    line-height: 100%;
}

.mod-toggle {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-200);
    color: var(--color-text);
    font-weight: 500;
}

.mod-toggle input[type="checkbox"] {
    position: absolute;
    left: 0;
    top: 0;
    z-index: 10;
    opacity: 0;
}

.toggle__icon.sun {
    /*position: absolute;*/
    /*left: -2rem;*/
    width: 1.25rem;
    height: 1.25rem;
}

.toggle__icon:hover {
    cursor: pointer;
}

.toggle__icon.lunar {
    /* position: absolute; */
    /*right: -2rem;*/
    width: 1.25rem;
    height: 1.25rem;
}

main.lightmod .icon-light {
    display: inline;
}

main.lightmod .icon-dark {
    display: none;
}

main.darkmod .icon-light {
    display: none;
}

main.darkmod .icon-dark {
    display: inline;
}

.toggle {
    position: relative;
    display: flex;
    align-items: center;
}

.toggle::before {
    content: '';
    height: 1.75rem;
    width: 3rem;
    background-color: #a729f5;
    display: inline-block;
    border-radius: 62.4375rem;
}

.toggle::after {
    content: '';
    position: absolute;
    left: 0.25rem;
    top: 0.25rem;
    height: 1.25rem;
    width: 1.25rem;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.2s ease-in-out;
}

.toggle:hover {
    cursor: pointer;
}

.mod-toggle input[type="checkbox"]:checked~.toggle::after {
    transform: translateX(1.25rem);
}

.mod-toggle input[type="checkbox"]:checked~.toggle::before {
    animation: opacity-on 0.4s ease forwards;
}

.mod-toggle input[type="checkbox"]:not(:checked)~.toggle::before {
    animation: opacity-off 0.4s ease forwards;
}

@keyframes opacity-on {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
    100% {
        opacity: 1;
    }
}

@keyframes opacity-off {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
    100% {
        opacity: 1;
    }
}

.deactivated {
    display: none;
}

.question-menu {
    width: min(90vw, 72.3125rem);
    margin: 0 auto;
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: start;
    gap: var(--space-800);
}

.question-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-200);
    max-width: 30rem;
}

.question-asking {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.question-count {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 1rem;
    font-style: italic;
}

.question-body {
    margin: 0;
    color: var(--color-text);
    font-family: Rubik;
    font-size: 2.25rem;
    font-style: normal;
    font-weight: 500;
    line-height: 120%;
}

.progress {
    width: 100%;
    height: 0.75rem;
    border-radius: 999px;
    overflow: hidden;
    transition: all 0.5s ease;
}

main.lightmod .progress {
    background-color: white;
}

main.darkmod .progress {
    background-color: #3b4d66;
}

.progress__bar {
    height: 100%;
    background: linear-gradient(90deg, #a729f5, #9a4ef3);
    border-radius: inherit;
    transition: all 0.6s ease;
}

.problem-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-200);
}

.answer-option {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-300);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-elevated);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease, border-color 0.2s ease, transform 0.1s ease, background-color 0.3s ease;
}

.answer-option:hover {
    border-color: rgba(167, 41, 245, 0.35);
    transform: translateY(-2px);
}

.answer-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.answer-option-content {
    display: flex;
    align-items: center;
    gap: var(--space-400);
}

.answer-icon-slot {
    width: 2.5rem;
    /* reserved space for ✓ / ✕ icon */
    height: 2.5rem;
    flex-shrink: 0;
}

.option-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 3.5rem;
    height: 3.5rem;
    border-radius: 0.75rem;
    background: rgba(83, 83, 107, 0.08);
    color: var(--colors-grey-500, #626c7f);
    font-family: Rubik, system-ui, -apple-system, sans-serif;
    font-size: 1.75rem;
    font-weight: 500;
    line-height: 100%;
    transition: all 0.3s ease;
}

main.darkmod .option-letter {
    background: #f4f6fa;
}

.option-text {
    color: var(--color-text);
    font-family: Rubik, system-ui, -apple-system, sans-serif;
    font-size: 1.75rem;
    font-weight: 500;
    line-height: 100%;
}

.answer-option:has(input[type="radio"]:checked) {
    border-color: #a729f5;
    box-shadow: 0 0 0 2px rgba(167, 41, 245, 0.15);
}

.answer-option:has(input[type="radio"]:checked) .option-letter {
    background: #a729f5;
    color: #ffffff;
}

.answer-option.correct:has(input[type="radio"]:checked) {
    border: 3px solid var(--colors-green-500, #2FD887);
    box-shadow: 0 16px 40px 0 rgba(143, 160, 193, 0.14);
}

.answer-option.correct:has(input[type="radio"]:checked) .option-letter {
    background: #2FD887;
    color: #ffffff;
}

.answer-option.error:has(input[type="radio"]:checked) {
    border: 3px solid var(--colors-red-500, #EE5454);
    box-shadow: 0 16px 40px 0 rgba(143, 160, 193, 0.14);
}

.answer-option.error:has(input[type="radio"]:checked) .option-letter {
    background: #EE5454;
    color: #ffffff;
}

.answer-icon-slot.correct {
    background-image: url('./assets/images/icon-correct.svg');
    background-repeat: no-repeat;
}

.answer-icon-slot.error {
    background-image: url('./assets/images/icon-error.svg');
    background-repeat: no-repeat;
}

.submit-btn {
    margin-top: var(--space-200);
    align-self: stretch;
    padding: var(--space-400);
    border: none;
    border-radius: 1.5rem;
    background: linear-gradient(90deg, #a729f5, #9a4ef3);
    color: white;
    font-family: Rubik, system-ui, -apple-system, sans-serif;
    font-size: 1.75rem;
    font-weight: 500;
    line-height: 100%;
    cursor: pointer;
    box-shadow: var(--shadow-elevated);
}

.required-msg {
    display: none;
    gap: var(--space-100);
    padding: 0;
    align-items: center;
    align-self: center;
}

.required-msg .icon-required {
    height: 2.5rem;
    width: 2.5rem;
    background-image: url('./assets/images/icon-error.svg');
    background-repeat: no-repeat;
}

.required-msg p {
    color: var(--colors-red-500, #EE5454);
    font-family: Rubik;
    font-size: 1.5rem;
    font-style: normal;
    font-weight: 400;
    line-height: 150%;
}

.score-menu {
    width: min(90vw, 72.3125rem);
    margin: 0 auto;
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: start;
    gap: var(--spacing-1800, 9rem);
}

.score-container {
    width: minmax(auto, 28.125rem);
    height: 8.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0;
    margin: 0;
}

.score-container h1 {
    color: var(--colors-blue-900, #313E51);
    padding: 0;
    margin: 0;
    font-family: Rubik;
    font-size: 4rem;
    font-style: normal;
    font-weight: 300;
    line-height: 100%;
    transition: all 0.3s ease;
}

main.darkmod .score-container h1 {
    color: white
}

.score-container h2 {
    color: var(--colors-blue-900, #313E51);
    padding: 0;
    margin: 0;
    font-family: Rubik;
    font-size: 4rem;
    font-style: normal;
    font-weight: 500;
    line-height: 100%;
    transition: all 0.3s ease;
}

main.darkmod .score-container h2 {
    color: white
}

.result-container {
    display: flex;
    flex-direction: column;
    align-self: stretch;
    padding: 0;
    margin: 0;
    gap: var(--space-400);
}

.result-content {
    display: flex;
    width: 100%;
    padding: var(--spacing-600, 3rem);
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-500, 2.5rem);
    border-radius: 1.5rem;
    background: var(--colors-white, #FFF);
    box-shadow: 0 16px 40px 0 rgba(143, 160, 193, 0.14);
    transition: all 0.3s ease;
}

main.darkmod .result-content {
    background: var(--colors-blue-850, #3B4D66);
    box-shadow: 0 16px 40px 0 rgba(49, 62, 81, 0.14);
}

.result-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-300, 1.5rem);
}

.result-header-icon-container {
    background-repeat: no-repeat;
    background-position: center;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 0.5rem;
}

.result-header-icon-container.HTML {
    background-image: url('./assets/images/icon-html.svg');
    background-color: #FFF5ED;
}

.result-header-icon-container.CSS {
    background-image: url('./assets/images/icon-css.svg');
    background-color: #E0FDEF;
}

.result-header-icon-container.JavaScript {
    background-image: url('./assets/images/icon-js.svg');
    background-color: #EBF0FF;
}

.result-header-icon-container.Accessibility {
    background-image: url('./assets/images/icon-accessibility.svg');
    background-color: #F6E7FF;
}

.result-detail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-200, 1rem);
    align-self: stretch;
}

.score-number {
    color: var(--colors-blue-900, #313E51);
    font-family: Rubik;
    font-size: 9rem;
    font-style: normal;
    font-weight: 500;
    line-height: 100%;
    transition: all 0.3s ease;
}

main.darkmod .score-number {
    color: white
}

.score-description {
    color: var(--colors-grey-500, #626C7F);
    font-family: Rubik;
    font-size: 1.5rem;
    font-style: normal;
    font-weight: 400;
    line-height: 150%;
    transition: all 0.3s ease;
}

main.darkmod .score-description {
    color: var(--colors-blue-300, #ABC1E1);
}

.return-btn {
    appearance: none;
    display: flex;
    padding: var(--spacing-400, 2rem);
    justify-content: center;
    align-items: center;
    gap: var(--spacing-100, 0.5rem);
    align-self: stretch;
    border: 0;
    border-radius: 1.5rem;
    background: var(--colors-purple-600, #A729F5);
    box-shadow: 0 16px 40px 0 rgba(143, 160, 193, 0.14);
    color: var(--colors-white, #FFF);
    font-family: Rubik;
    font-size: 1.75rem;
    font-style: normal;
    font-weight: 500;
    line-height: 100%;
    cursor: pointer;
}

main.darkmod .return-btn {
    box-shadow: 0 16px 40px 0 rgba(49, 62, 81, 0.14);
}

@media (max-width: 900px) {
    .start-menu {
        flex-direction: column;
        gap: 2.5rem;
        max-width: 48rem;
        width: 100%;
        padding-inline: 1.5rem;
        margin-inline: auto;
    }
    .subject-list {
        width: 100%;
    }
    .welcome-section {
        max-width: 36rem;
    }
}

@media (max-width: 900px) {
    .question-menu {
        width: 100%;
        max-width: 36rem;
        margin-inline: auto;
        padding-inline: 1.5rem;
        grid-template-columns: 1fr;
        gap: var(--space-400);
    }
    .question-section {
        max-width: 100%;
    }
    .problem-list {
        width: 100%;
    }
}

@media (max-width: 900px) {
    .score-menu {
        width: 100%;
        max-width: 36rem;
        grid-template-columns: 1fr;
        gap: var(--space-800);
    }
    .score-container {
        max-width: 100%;
    }
    .result-container {
        width: 100%;
    }
}

@media (min-width: 1100px) {
    .question-section {
        height: 29.31rem;
        justify-content: space-between;
    }
}