/*#region root/html/body*/
:root {
    --shadow-color: 0deg 0% 0%;
    --shadow-elevation-low: 0px 0.5px 0.6px hsl(var(--shadow-color) / 0.1), 0px 0.8px 0.9px -1.2px hsl(var(--shadow-color) / 0.1), 0px 2px 2.3px -2.5px hsl(var(--shadow-color) / 0.1);
    --shadow-elevation-medium: 0px 0.5px 0.6px hsl(var(--shadow-color) / 0.11), 0px 1.6px 1.8px -0.8px hsl(var(--shadow-color) / 0.11), 0px 4.1px 4.6px -1.7px hsl(var(--shadow-color) / 0.11), 0px 9.9px 11.1px -2.5px hsl(var(--shadow-color) / 0.11);
    --shadow-elevation-high: 0px 0.5px 0.6px hsl(var(--shadow-color) / 0.1), 0px 2.9px 3.3px -0.4px hsl(var(--shadow-color) / 0.1), 0px 5.4px 6.1px -0.7px hsl(var(--shadow-color) / 0.1), 0px 8.9px 10px -1.1px hsl(var(--shadow-color) / 0.1), -0.1px 14.2px 16px -1.4px hsl(var(--shadow-color) / 0.1), -0.1px 22.1px 24.9px -1.8px hsl(var(--shadow-color) / 0.1), -0.1px 33.6px 37.8px -2.1px hsl(var(--shadow-color) / 0.1), -0.2px 49.5px 55.7px -2.5px hsl(var(--shadow-color) / 0.1);
}

@font-face {
    font-family: 'Mona Sans';
    src: url('../media/fonts/Mona Sans/Mona-Sans.woff2');
    font-display: swap;
}

html,
body {
    margin: 0;
    padding: 0;
    background-color: transparent;
}

body {
    color: #E6EDF3;
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
}

body::before {
    display: none;
}

@media (pointer: fine) {
    body::-webkit-scrollbar {
        width: 0.5rem;
    }

    body::-webkit-scrollbar-thumb {
        background-color: #363B42;
        border-radius: 0.125rem;
    }

    body :-webkit-scrollbar-track {
        -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
    }
}

body * {
    font-family: 'Mona Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;

    margin: 0;
    padding: 0;

    color: #E6EDF3;

    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
}

a {
    color: #6c96bb;
    text-decoration: underline 1.5pt;
}

.hidden {
    display: none !important;
}

/*#endregion*/

/*#region header*/
header {
    width: 100%;
    height: 4rem;
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(1, 4, 9, 0.6); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    position: relative;
    z-index: 10;
}

header>.title {
    width: 60%;
    padding-left: 5%;
    display: flex;
}

header>.content {
    width: 30%;
    padding-right: 5%;
    display: flex;
    gap: 10%;
    justify-content: flex-end;
    align-items: center;
}

header>.content>.header-content>* {
    width: 7rem;
    height: 5rem;
    background: transparent;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: larger;
}

header>.content>.hamburger-menu-container {
    display: none;
}

@media (pointer: fine) {
    header>.content>.header-content>*:hover {
        text-decoration: #E6EDF3 underline solid 2pt;
    }
}

@media only screen and (max-width: 1144px) {
    header>.content {
        width: 100%;
    }
}

@media only screen and (max-width: 993px) {
    header>.title {
        width: 100%;
    }

    header>.content {
        position: absolute;
        width: 100%;
        height: 100%;
        padding: 0;
    }

    header>.content>.hamburger-menu-container {
        display: grid;
        justify-content: center;
        align-items: center;
        position: absolute;
        top: 0;
        right: 0;
        width: 4rem;
        height: calc(4.75rem - 1pt);
        background-color: rgba(1, 4, 9, 0.6); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
        border-radius: 1rem 0 0 1rem;
    }

    header>.content>.hamburger-menu-container-opened {
        position: fixed;
    }

    header>.content>.hamburger-menu-button {
        display: block;
        right: 2rem;
        top: 1.25rem;
        width: 2.5rem;
        height: 2.5rem;
        padding: 0;
    }

    header>.content>.hamburger-menu-button>svg {
        pointer-events: none;
    }

    header>.content>.header-content {
        transition: transform 100ms ease;
        transform: translateX(100%);
        position: fixed;
        right: 0;
        top: 7.75rem;
        width: 10rem;
        display: grid;
        grid-template-rows: repeat(4, 3.5rem);
        border-radius: 1rem 0 0 1rem;
        border: #21262D solid 1pt;
        overflow: hidden;
    }

    header>.content>.header-content-opened {
        transform: translateX(0%);
    }

    header>.content>.header-content>* {
        width: 100%;
        height: 100%;
        padding: 1rem;
        background-color: rgba(1, 4, 9, 0.6); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    }
}

@media only screen and (max-width: 854px) {
    header {
        justify-content: center;
        position: relative;
    }

    header>.title {
        width: fit-content;
        padding: 0;
    }

    header>.title>h1 {
        margin-top: 0.75rem;
    }
}

@keyframes closeHeaderContent {
    0% {
        transform: translateX(0%);
    }

    100% {
        transform: translateX(100%);
    }
}

/*#endregion*/

/*#region top bar*/
.top-bar {
    height: 3rem;
    background-color: rgba(1, 4, 9, 0.6); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border-bottom: #21262D solid 1pt;
    display: grid;
    padding: 0 1rem 0.75rem 1rem;
    gap: 1rem;
    justify-content: center;
    align-content: center;
    align-items: center;
    grid-template-columns: 2rem 2rem 1fr;

    box-shadow: var(--shadow-elevation-medium);
    position: relative;
    z-index: 10;
}

.top-bar button {
    background-color: transparent;
    border: none;
    border-radius: 100%;
    width: 2.5rem;
    height: 2.5rem;
    transition: background-color 200ms ease;
}

.top-bar button svg path {
    fill: #abafb2;
}

.top-bar .active {
    cursor: pointer;
}

.top-bar .active svg path {
    fill: #E6EDF3;
}

@media (pointer: fine) {
    .top-bar .active:hover {
        background-color: rgba(231, 238, 243, 0.125);
    }
}

.top-bar .bar {
    height: 3rem;
    background-color: #21262D;
    margin: 0.25rem;
    border-radius: 0.5rem;
    display: grid;
    gap: 1rem;
    grid-template-columns: 4rem 1fr;
    align-items: center;
    font-size: large;
    font-weight: 500;
    overflow-x: auto;
}

@media (pointer: fine) {
    .top-bar .bar::-webkit-scrollbar {
        height: 0.5rem;
    }

    .top-bar .bar::-webkit-scrollbar-thumb {
        background-color: #abafb2;
        border-radius: 0.125rem;
    }

    .top-bar .bar :-webkit-scrollbar-track {
        -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
    }
}

.top-bar .bar .path-icon-container {
    display: flex;
    align-items: center;
    margin-left: 0.5rem;
    min-width: 4rem;
    width: 4rem;
    height: 1.5rem;
}

.top-bar .bar .path-icon-container .path-icon {
    padding: 0.5rem;
    width: 100%;
    height: 100%;
}

.top-bar .bar .path-icon-container .path-icon {
    width: 100%;
    height: 100%;
    border-radius: 100%;
    cursor: pointer;
    transition: background-color 100ms ease;
}

@media (pointer: fine) {
    .top-bar .bar .path-icon-container .path-icon:hover {
        background-color: #363B42;
    }
}

.top-bar .bar .path-icon-container svg {
    width: 100%;
    height: 100%;
}

.top-bar .bar .path {
    display: flex;
    width: max-content;
    padding-right: 1rem;
    position: relative;
}

.top-bar .bar .path>div {
    display: flex;
    align-items: center;
    white-space: nowrap;
}

@media (pointer: fine) {
    .top-bar .bar .path>div>div {
        padding: 0.5rem;
    }
}

.top-bar .bar .path>div>div {
    margin: 0;
    border-radius: 1rem;
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
}

.path-not-clickable {
    pointer-events: none;
}

.path-clickable {
    cursor: pointer;
    transition: background-color 100ms ease;
}

@media (pointer: fine) {
    .path-clickable:hover {
        background-color: #363B42;
    }
}

.top-bar .bar .path div svg {
    display: flex;
    align-items: center;
    width: 2rem;
    height: 1.5rem;
}

.top-bar .bar .path-arrow {
    font-size: 24pt;
}

/*#endregion*/

.main-section {
    background-color: transparent;
    display: flex;
}

/*#region side panel*/
.side-panel {
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;

    padding: 1rem 1rem 8rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    width: 15rem;
    height: calc(100vh - 16.75rem - 1pt);
    height: calc(100dvh - 16.75rem - 1pt);
    overflow: auto;

    background-color: rgba(1, 4, 9, 0.6); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    border-right: #21262D solid 1pt;

    z-index: 300;
    position: relative;
}

@media (pointer: fine) {
    .side-panel::-webkit-scrollbar {
        width: 0.5rem;
    }

    .side-panel::-webkit-scrollbar-thumb {
        background-color: #21262D;
        border-radius: 0.125rem;
    }

    .side-panel::-webkit-scrollbar-track {
        -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
    }
}

.side-group-title {
    font-size: larger;
    font-weight: 700;
    padding-bottom: 0.5rem;
}

.side-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.side-button svg {
    min-width: 1.5rem;
    max-width: 1.5rem;
}

.side-button {
    cursor: pointer;
    height: 1.25rem;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background-color 100ms ease;
}

@media (pointer: fine) {
    .side-button:hover {
        background-color: #21262D;
    }
}

.side-button-year {
    margin-left: 1rem;
}

.side-button-session {
    margin-left: 2rem;
}

.side-button-variant {
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    margin-left: 3rem;
}

.side-container {
    display: grid;
    grid-template-rows: 1fr;
    transition: grid-template-rows 250ms ease;
}

.collapsed {
    grid-template-rows: 0fr;
}

.side-group {
    overflow: hidden;
}

.side-button-arrow {
    pointer-events: all;
}

.side-button-arrow path {
    fill: #E6EDF3;
    transition: fill 100ms ease-in-out;
}

@media (pointer: fine) {
    .side-button-arrow:hover path {
        fill: #abafb2;
    }
}

.side-panel .credits {
    pointer-events: none;
    z-index: 1;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 16.5rem;
    height: 7rem;
    display: flex;
    align-items: end;
    justify-content: center;
    gap: 0.25rem;
}

.side-panel .credits div {
    pointer-events: all;
    width: 100%;
    padding-top: 2rem;
    padding-bottom: 1.5rem;
    text-align: center;
    font-weight: 550;
    font-size: 14pt;
}

.side-panel .credits::before {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    mask-image: linear-gradient(to top, rgba(0, 0, 0, 1) 25%, rgba(0, 0, 0, 0) 100%);
    -webkit-mask-image: linear-gradient(to top, rgba(0, 0, 0, 1) 25%, rgba(0, 0, 0, 0) 100%);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.5) 50%, rgba(0, 0, 0, 0) 100%);
    z-index: -1;
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

/*#endregion*/

.main-container {
    width: calc(100% - 17rem);
    height: calc(100vh - 7.75rem - 1pt);
    height: calc(100dvh - 7.75rem - 1pt);
    overflow: hidden;
}

.main {
    width: 100%;
    height: 100%;
    overflow: auto;
}

.main * {
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
}

@media (pointer: fine) {
    .main::-webkit-scrollbar {
        width: 0.5rem;
    }

    .main::-webkit-scrollbar-thumb {
        background-color: #21262D;
        border-radius: 0.125rem;
    }

    .main::-webkit-scrollbar-track {
        -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.3);
    }
}

.home,
.sub-menu {
    width: 100%;
    display: flex;
    flex-direction: column;
}

.home>h2,
.sub-menu>h2 {
    margin: 1.5rem 0 0 1.5rem;
}

.home>div,
.sub-menu>div {
    display: flex;
    flex-wrap: wrap;
}

.card-container {
    margin: 2.5rem;
    width: 15rem;
    height: 15rem;
    perspective: 600px;
}

.card {
    cursor: pointer;
    width: 100%;
    height: 100%;
    border-radius: 1rem;
    overflow: hidden;
    position: relative;
    z-index: 10;
    transition: scale 150ms ease, box-shadow 150ms ease;
    border: #363B42 solid 0.5pt;
    box-shadow: var(--shadow-elevation-medium);
}

@media (pointer: fine) {
    .card:hover {
        scale: 1.025;
        box-shadow: var(--shadow-elevation-high);
    }

    .card:hover img {
        scale: 1.05;
    }
}

.image-container {
    overflow: hidden;
    border-radius: 1rem;
    width: 100%;
    height: 100%;
    position: relative;
}

.image-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.image-container img {
    overflow: hidden;
    user-select: none;
    -moz-user-select: none;
    -webkit-user-select: none;
    pointer-events: none;
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: scale 150ms ease-in-out;
}

.image-container::before {
    pointer-events: none;
    content: '';
    position: absolute;
    z-index: 1;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0), rgba(0, 0, 0, 0.75));
}

.card-title {
    pointer-events: none;
    z-index: 1;
    position: absolute;
    bottom: 10%;
    left: 10%;
    font-size: x-large;
    font-weight: bold;
}

.bubble-sheet-menu {
    scroll-behavior: smooth;

    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;

    padding: 1rem 0 2rem 0;
}

.bubble-sheet-title {
    padding: 2rem;
    font-size: x-large;
    font-weight: 600;
}

.bubble-sheet-container {
    width: 80%;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
    padding: 1rem;
}

.bubble-sheet-container div {
    font-size: x-large;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1.5rem 1rem;
    border: #363B42 solid 0.5pt;
    transition: background-color 100ms ease;
}

.bubble-chosen {
    background-color: #5E656E;
}

@media (pointer: fine) {
    .bubble-choice:hover {
        cursor: pointer;
        background-color: #21262D;
    }

    .bubble-choice.bubble-chosen:hover {
        cursor: pointer;
        background-color: color-mix(in srgb, #21262D 50%, #5E656E 50%);
    }
}

.bubble-sheet-menu button:not(.timer-toggle-button):not(.timer-stop-button):not(.timer-play-pause-button):not(.bubble-sheet-pdf-btn) {
    font-size: 1.1rem;
    font-weight: 600;
    padding: 0.8rem 1.8rem;
    margin: 1rem;
    border-radius: 8px;
    background-color: #0078d4;
    color: #ffffff;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    transition: all 150ms ease;
}

@media (pointer: fine) {
    .bubble-sheet-menu button:not(.timer-toggle-button):not(.timer-stop-button):not(.timer-play-pause-button):not(.bubble-sheet-pdf-btn):hover {
        cursor: pointer;
        background-color: #0086f0;
        transform: translateY(-2px);
        box-shadow: 0 6px 12px rgba(0,0,0,0.4);
    }
}

.bubble-sheet-menu .exam-mark {
    margin: 1rem 0;
    padding: 2.5rem;
    border-radius: 1rem;
    background-color: #E6EDF3;
    color: #0D1117;
    font-size: xx-large;
    font-weight: bold;
}

.correct-question {
    background-color: #238636;
    box-shadow: 15px 0px 20px -5px #2386364d, -15px 0px 20px -5px #2386364d;
}

.wrong-question {
    background-color: #862323;
    box-shadow: 15px 0px 20px -5px #8623234d, -15px 0px 20px -5px #8623234d;
}

.discounted-question {
    background-color: #86237e;
    box-shadow: 15px 0px 20px -5px #86237e4d, -15px 0px 20px -5px #86237e4d;
}

.corrected-discounted-question {
    position: relative;
}

.corrected-discounted-question::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    border: #86237e solid 0.25rem;
    border-radius: 0.5rem;
}

.corrected-question {
    position: relative;
}

.corrected-question::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    border: #E6EDF3 solid 0.25rem;
    border-radius: 0.5rem;
}

#i-button-discounted {
    cursor: pointer;
    background-color: #abafb2;
    border: none;
    padding: 0.5rem;
    width: 2rem;
    height: 2rem;
    border-radius: 100%;
    transition: background-color 100ms ease;
}

@media (pointer: fine) {
    #i-button-discounted:hover {
        background-color: #797e85;
    }
}

.discounted-question-info {
    width: 1rem;
    height: 1rem;
}

.clock-container {
    z-index: 100002;
}

.toggle-clock {
    cursor: pointer;
    z-index: 100;
    position: fixed;
    background-color: #E6EDF3;
    left: 16rem;
    top: 10rem;
    height: 2rem;
    width: 2rem;
    border-radius: 0 1rem 1rem 0;
    padding: 1rem 1rem 1rem 2rem;
    box-shadow: var(--shadow-elevation-medium);
    transition: left 250ms ease;
    pointer-events: all;
}

.clock-container>.toggle-clock-opened {
    left: 12rem !important;
}

.toggle-clock svg {
    width: 100%;
}

.toggle-clock path {
    fill: #010409;
}

@media (pointer: fine) {
    .toggle-clock:hover {
        left: 16.5rem;
    }
}

.clock-minimize-btn {
    display: none;
}

.clock {
    z-index: 100;
    position: fixed;
    top: 9rem;
    left: 6rem;
    padding: 0.75rem;
    background-color: #E6EDF3;
    border-radius: 1rem;
    display: grid;
    grid-template-columns: 1rem 1rem 1rem 1rem 1rem 1rem 1rem 1.5rem;
    grid-template-rows: 2rem;
    align-items: center;
    align-content: center;
    justify-content: center;
    gap: 0.125rem;
    height: 5rem;
    transition: left 250ms ease;
    box-shadow: var(--shadow-elevation-medium);
    pointer-events: all;
}

.clock-opened {
    left: 18rem;
}

.inline-clock {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    transform: none !important;
    margin: 0 auto;
    z-index: 10;
}

.inline-clock-wrapper {
    display: flex;
    justify-content: center;
    width: 100%;
    margin-bottom: 20px;
}

.digit {
    height: 100%;
    position: relative;
    height: 2.2rem;
    overflow: hidden;
}

.clock p {
    background-color: inherit;
    color: #000;
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
}

.digit p {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, 150%);
    transition: transform 0.6s cubic-bezier(.28, -0.05, .57, 1.5), opacity 0.6s cubic-bezier(.28, -0.05, .57, 1.5);
    opacity: 0.7;
}

.digit p.current {
    transform: translate(-50%, -50%);
    opacity: 1;
}

.digit p.out {
    transform: translate(-50%, -150%);
    opacity: 0.5;
}

.timer-play-pause-button {
    grid-column: 3 span;
}

.timer-stop-button {
    grid-column: 3 span;
}

.timer-toggle-button,
.timer-play-pause-button,
.timer-stop-button {
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    background: transparent;
    border: none;
    width: 100%;
    height: 1.5rem;
}

.timer-toggle-button {
    grid-row: 2 span;
    height: 100%;
}

.timer-play-pause-button svg,
.timer-stop-button svg {
    width: 100%;
    height: 100%;
}

.pdf-viewer-container,
.periodic-table-pdf-viewer-container {
    pointer-events: none;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

.pdf-viewer-container *,
.periodic-table-pdf-viewer * {
    pointer-events: all;
}

.switch-to-pdf,
.switch-to-periodic-table-pdf {
    position: fixed;
    z-index: 201;
    bottom: 1rem;
    right: 1rem;
    padding: 1rem;
    width: 2.5rem;
    height: 2.5rem;

    cursor: pointer;
    background-color: #E6EDF3;
    border-radius: 100%;
    box-shadow: var(--shadow-elevation-medium);
    transition: scale 150ms ease;
}

.switch-to-periodic-table-pdf {
    pointer-events: all;
    position: fixed;
    z-index: 200;
    bottom: 6.5rem;
    right: 1rem;
    padding: 1rem;
    width: 2.5rem;
    height: 2.5rem;

    cursor: pointer;
    background-color: #E6EDF3;
    border-radius: 100%;
    box-shadow: var(--shadow-elevation-medium);
    transition: scale 150ms ease;

    display: flex;
    justify-content: center;
    align-items: center;
}

@media (pointer: fine) {
    .switch-to-pdf:hover::after {
        content: 'PDF (Z)';
    }

    .switch-to-periodic-table-pdf:hover::after {
        content: 'Periodic Table (X)';
    }

    .switch-to-pdf:hover::after,
    .switch-to-periodic-table-pdf:hover::after {
        z-index: 205;
        position: absolute;
        width: 4rem;
        display: flex;
        justify-content: center;
        align-items: center;
        text-align: center;
        background-color: #E6EDF3;
        padding: 0.5rem;
        border-radius: 1rem;
        bottom: calc(100% + 0.5rem);
        color: #010409;
        right: -0.25rem;
        animation: fadeIn 200ms ease;
    }

    .switch-to-pdf:hover::before,
    .switch-to-periodic-table-pdf:hover::before {
        z-index: 205;
        content: '';
        position: absolute;
        display: flex;
        width: 0;
        height: 0;
        border-left: 0.25rem solid transparent;
        border-right: 0.25rem solid transparent;
        border-top: 0.25rem solid #E6EDF3;
        bottom: calc(100% + 0.25rem + 0.25pt);
        right: 2rem;
        animation: fadeIn 200ms ease;
    }
}

.i-button {
    position: absolute;
    z-index: 1;
    top: 1rem;
    right: 1rem;
    padding: 1rem;
    width: 1.5rem;
    height: 1.5rem;

    cursor: pointer;
    background-color: #E6EDF3;
    border-radius: 100%;
    box-shadow: var(--shadow-elevation-medium);
    transition: scale 150ms ease;

    display: flex;
    justify-content: center;
    align-items: center;
}

@media (pointer: fine) {
    .i-button:hover {
        scale: 1.05;
    }
}

@media (pointer: fine) {

    .timer-button:hover,
    .switch-to-pdf:hover,
    .switch-to-periodic-table-pdf:hover {
        scale: 1.05;
    }
}

.switch-to-pdf svg,
.switch-to-periodic-table-pdf svg {
    width: 100%;
    height: 100%;
}

.i-button svg,
.switch-to-periodic-table-pdf svg {
    width: 90%;
    height: 90%;
}

.switch-to-pdf svg path,
.i-button svg path,
.switch-to-periodic-table-pdf svg path {
    width: 100%;
    height: 100%;
    fill: #0D1117;
}

.pdf-viewer,
.periodic-table-pdf-viewer {
    position: fixed;
    z-index: 150;
    bottom: 0;
    right: 0;
    width: calc(100% - 17rem);
    height: calc(100vh - 7.75rem - 1pt);
    height: calc(100dvh - 7.75rem - 1pt);
    transition: bottom 100ms ease;
}

.custom-layout-select {
    position: relative;
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
    user-select: none;
    font-family: var(--font-display, 'Space Grotesk', 'Inter', sans-serif);
    perspective: 1000px;
}

.custom-layout-select-trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    background: rgba(22, 27, 34, 0.7);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    cursor: pointer;
    color: #f0f6fc;
    font-size: 1.15rem;
    font-weight: 700;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), inset 0 0 0 1px rgba(255, 255, 255, 0.05);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
}

.custom-layout-select-trigger::before {
    content: '';
    position: absolute;
    top: -2px; left: -2px; right: -2px; bottom: -2px;
    background: linear-gradient(45deg, #bb86fc, #ff79c6, #8be9fd, #50fa7b, #ffb86c);
    z-index: -1;
    border-radius: 18px;
    opacity: 0;
    transition: opacity 0.4s ease;
    filter: blur(8px);
}

.custom-layout-select-trigger:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5), inset 0 0 0 1px rgba(255, 255, 255, 0.2);
    background: rgba(30, 36, 45, 0.8);
}

.custom-layout-select-trigger:hover::before {
    opacity: 0.6;
    animation: flowGradient 6s linear infinite;
}

@keyframes flowGradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.custom-layout-select-trigger .layout-icon {
    display: flex;
    align-items: center;
    gap: 16px;
}

.custom-layout-select-trigger .layout-icon svg {
    filter: drop-shadow(0 0 6px rgba(187, 134, 252, 0.8));
    color: #bb86fc;
}

.custom-layout-select-trigger.open {
    border-bottom-left-radius: 4px;
    border-bottom-right-radius: 4px;
    background: rgba(30, 36, 45, 0.9);
    border-color: rgba(187, 134, 252, 0.6);
    box-shadow: 0 0 20px rgba(187, 134, 252, 0.3);
}

.custom-layout-select-trigger.open::before {
    opacity: 0.8;
}

.custom-layout-select-trigger.open .chevron {
    transform: rotate(180deg) scale(1.2);
    color: #ff79c6;
    filter: drop-shadow(0 0 6px rgba(255, 121, 198, 0.8));
}

.custom-layout-options {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(187, 134, 252, 0.4);
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 30px rgba(187, 134, 252, 0.15);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px) scale(0.95) rotateX(-10deg);
    transform-origin: top center;
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    flex-direction: column;
    padding: 8px;
    gap: 4px;
    overflow: hidden;
}

.custom-layout-select.open .custom-layout-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1) rotateX(0deg);
}

.custom-layout-option {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 16px 20px;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    position: relative;
    overflow: hidden;
    background: transparent;
    border: 1px solid transparent;
}

.custom-layout-option::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
}

.custom-layout-option:hover::after {
    transform: translateX(100%);
}

.custom-layout-option:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateX(6px);
}

.custom-layout-option.handout:hover {
    background: linear-gradient(90deg, rgba(88, 166, 255, 0.1), transparent);
    border-left: 3px solid #58a6ff;
}
.custom-layout-option.exam:hover {
    background: linear-gradient(90deg, rgba(163, 113, 247, 0.1), transparent);
    border-left: 3px solid #a371f7;
}
.custom-layout-option.practice:hover {
    background: linear-gradient(90deg, rgba(63, 185, 80, 0.1), transparent);
    border-left: 3px solid #3fb950;
}

.custom-layout-option .icon-box {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.custom-layout-option:hover .icon-box {
    transform: scale(1.15) rotate(5deg);
}

.custom-layout-option .option-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.custom-layout-option .option-title {
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.01em;
    transition: color 0.3s ease;
}

.custom-layout-option:hover .option-title {
    filter: brightness(1.3);
}

.custom-layout-option .option-desc {
    color: #8b949e;
    font-size: 0.9rem;
    line-height: 1.4;
    transition: color 0.3s ease;
}

.custom-layout-option:hover .option-desc {
    color: #c9d1d9;
}

.exit-exam-mode-btn {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
    font-weight: bold;
    font-size: 0.9rem;
    padding: 6px 14px;
    border-radius: 6px;
    box-shadow: 0 4px 10px rgba(220, 38, 38, 0.4);
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    font-family: 'Inter', sans-serif;
    margin-left: auto;
    margin-right: 12px;
}

.exit-exam-mode-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 15px rgba(220, 38, 38, 0.6);
}

.exit-exam-mode-btn:active {
    transform: translateY(0);
}

body.split-screen-active .exit-exam-mode-btn {
    display: flex;
}

body.split-screen-active .bubble-sheet-container {
    width: 100%;
    padding: 0;
    gap: 0;
}

body.split-screen-active .bubble-sheet-container div {
    padding: 0.6rem 0;
    font-size: 1.1rem;
}

.textLayer, .textLayer *, .pdf-page-wrapper * {
    user-select: text !important;
    -webkit-user-select: text !important;
    cursor: text;
}

.hide-viewer {
    bottom: -100%;
}

.ACE {
    box-shadow: 1px 0 20px 9px #23863680, inset 1px 0 20px 9px #23863680;
}

.green {
    color: #238636;
    text-shadow: 1px 0 10px #23863680;
}

.red {
    color: #862323;
    text-shadow: 1px 0 10px #86232380;
}

.purple {
    color: #86237e;
    text-shadow: 1px 0 10px #86237e80;
}

@keyframes openMenu {
    0% {
        margin-top: 1.5rem;
        opacity: 0;
    }

    100% {
        margin-top: 0rem;
        opacity: 1;
    }
}

@keyframes closeMenu {
    0% {
        margin-top: 0rem;
        opacity: 1;
    }

    100% {
        margin-top: 1.5rem;
        opacity: 0;
    }
}

@media only screen and (max-width: 921px) {
    header {
        z-index: 101;
    }

    header>.content>.header-content {
        top: 4.75rem;
    }

    .top-bar {
        padding-top: 1rem;
        position: sticky;
        top: 0;
        z-index: 100;
    }

    .top-bar::before {
        position: absolute;
        content: '';
        width: 100%;
        height: 5rem;
        bottom: 100%;
        z-index: -1;
        background-color: rgba(1, 4, 9, 0.6); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    }

    .main-section {
        overflow-y: visible;
    }

    .main {
        width: 100%;
        height: 100%;
        overflow: visible;
    }

    .main-container {
        width: 100%;
        min-height: calc(100vh - 3.75rem - 1pt);
        min-height: calc(100dvh - 3.75rem - 1pt);
        height: fit-content;
        overflow: visible;
    }

    .side-panel {
        display: none;
    }

    .side-panel .credits {
        left: -100%;
    }

    .main {
        width: 100%;
    }

    .main>div>div {
        justify-content: center;
    }

    .main>div>h2 {
        margin: 1.5rem 0 0 0;
        text-align: center;
    }

    .card-container {
        margin: 1rem;
    }

    .bubble-sheet-menu {
        margin-bottom: 8rem;
    }

    .bubble-sheet-buttons-container {
        display: flex;
        flex-direction: column;
        align-items: center;
        position: relative;
    }

    .bubble-sheet-reveal-button {
        position: absolute;
        width: 12rem;
        top: calc(100% + 9rem);
    }

    .pdf-viewer-container,
    .periodic-table-pdf-viewer-container {
        width: 100%;
        height: 100vh;
        height: 100dvh;
    }

    .pdf-viewer,
    .periodic-table-pdf-viewer {
        width: 100%;
        height: 100vh;
        height: 100dvh;
    }

    .switch-to-periodic-table-pdf {
        bottom: 5.5rem;
    }

    .switch-to-pdf,
    .switch-to-periodic-table-pdf {
        width: 1.5rem;
        height: 1.5rem;
    }

    @media (pointer: fine) {

        .switch-to-pdf:hover::before,
        .switch-to-periodic-table-pdf:hover::before {
            right: 1.55rem;
        }
    }

    .i-button {
        width: 1rem;
        height: 1rem;
    }

    .clock-container {
        pointer-events: none;
    }

    .clock {
        transform-origin: top right;
    }
}

@media only screen and (max-width: 551px) {
    .card-container {
        height: 7rem;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* Split Screen Bubble Sheet UI */
.realtime-settings {
    margin: 10px auto 20px auto;
    width: max-content;
    display: flex;
    flex-direction: column;
    background: rgba(1, 4, 9, 0.6);
    border: 1pt solid #21262D;
    border-radius: 18px;
    padding: 16px 24px;
    box-sizing: border-box;
    box-shadow: var(--shadow-elevation-medium);
}
.realtime-row {
    display: flex;
    justify-content: center;
    gap: 20px;
    align-items: center;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: #E6EDF3;
    font-size: 1.1rem;
    font-weight: 500;
}
.toggle-switch-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
}
.toggle-switch {
    background: #363B42;
    width: 40px;
    height: 20px;
    border-radius: 14px;
    position: relative;
    transition: background 0.3s;
}
.toggle-switch.active {
    background: #238636;
}
.toggle-thumb {
    width: 28px;
    height: 28px;
    background: #E6EDF3;
    border-radius: 50%;
    position: absolute;
    top: -4px;
    left: -2px;
    transition: transform 0.3s, background 0.3s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
.toggle-switch.active .toggle-thumb {
    transform: translateX(16px);
    background: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

body.split-screen-active header,
body.split-screen-active #top-bar,
body.split-screen-active aside {
    display: none !important;
}

body.split-screen-active .external-pdf-btn,
body.split-screen-active .bubble-sheet-pdf-btn:not(.exam-layout-btn) {
    display: none !important;
}

body.split-screen-active #pdf-buttons-container,
body.split-screen-active #bubble-sheet-title,
body.split-screen-active #layout-select-container {
    display: none !important;
}

body.split-screen-active .clock-container {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    margin: 10px auto 30px auto !important;
    height: auto !important;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100001 !important;
    pointer-events: none !important;
}

body.split-screen-active .toggle-clock,
body.split-screen-active .clock-minimize-btn {
    display: none !important;
}

body.split-screen-active .clock {
    position: relative !important;
    top: auto !important;
    left: auto !important;
    transform: none !important;
    opacity: 1 !important;
    pointer-events: auto !important;
    width: max-content !important;
    margin: 0 auto;
}

body.split-screen-active .clock .timer-toggle-button,
body.split-screen-active #pdf-btn-close {
    display: none !important;
}