/* Navigation Style */
header {
    background-color: #ff2c2c;
    padding: 1rem 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
}
.navbar {
    height: 52.2px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.app-icon-container {
    display: flex;
    align-items: center;
}
.app-icon {
    width: 45px;
    height: 45px;
    margin-right: 1rem;
    border: 2px solid white;
    border-radius: 8px;
    align-items: center;
    transition: transform .2s, border-color .2s;
}
.app-icon-container a:hover .app-icon {
    transform: scale(1.1);
    border-color: #333;
}
.app-icon-container a:active .app-icon {
    transform: scale(.9);
    border-color: #333;
}
.app-icon-container a:hover .app-icon .index {
    transform: scale(1.1);
    border-color: white;
}
.app-icon-container a:active .app-icon .index {
    transform: scale(.9);
    border-color: white;
}
.app-name {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    transition: transform .2s, color .2s;
    text-decoration: none;
}
.app-name:hover {
    color: #333;
    transform: scale(1.1);
}
.app-name:active {
    color: #333;
    transform: scale(.9);
}

.nav-index {
    margin-right: 1rem;
}
.nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    margin-left: auto;
}
.nav-links li {
    margin-left: 2rem;
}
.nav-links li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: transform .2s, color .2s;
    display: inline-block;
}
.nav-links li a:hover {
    transform: scale(1.1);
    color: #333;
}
.nav-links li a:active {
    transform: scale(.9);
    color: #333;
}
.navbar-login {
    margin-right: 1rem;
}
.navbar-login a {
    border: solid white;
    border-radius: 0.5rem;
    padding: .5rem;
    transition: border-color .2s, transform .2s, color .2s !important;
}
.navbar-login a:hover, .navbar-login a:active {
    border-color: #333;
}

.right-side-navbar {
    display: flex;
    align-items: center;
    margin-right: .3rem;
}
.hamburger-menu {
    display: none;
    cursor: pointer;
    flex-direction: column;
    transition: transform .2s;
}
.hamburger-menu .bar {
    width: 25px;
    height: 3px;
    background-color: white;
    transition: background-color .2s;
}
.hamburger-menu:hover .bar {
    transform: scale(1.1);
    background-color: #333;
}
.hamburger-menu:active .bar {
    transform: scale(0.9);
    background-color: #333;
}
.profile-icon-wrapper {
    width: 35px;
    height: 35px;
    border: 2px solid white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, border-color 0.2s;
    margin-left: 2rem;
}
.profile-icon {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    object-fit: cover;
    transition: filter 0.2s;
}
.profile-icon-wrapper:hover {
    transform: scale(1.1);
    border-color: #333;
}
.profile-icon-wrapper:active {
    transform: scale(.9);
    border-color: #333;
}
.profile-icon-wrapper:hover .profile-icon.default,
.profile-icon-wrapper:active .profile-icon.default {
    filter: brightness(.2);
}



/* Vanilla Style */
body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    color: #333;
}
footer {
    text-align: center;
}
.vanilla-h1 {
    font-size: 2.5rem;
    font-family: 'Comic Sans MS', sans-serif;
    color: #333;
    margin-bottom: .5rem;
}
.vanilla-p {
    font-size: 1.2rem;
    font-family: 'Comic Sans MS', sans-serif;
    color: #555;
    margin-bottom: 3rem;
}
.first-line-p, .margin-top-less {
    margin-top: 0;
}
.last-line-p, .margin-bottom-less {
    margin-bottom: 0;
}
.timeStamp {
    font-size: .8rem;
    color: #888;
}



/* Alert Style */
.alert-popup-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.alert-popup-content {
    background: white;
    padding: 20px;
    border-radius: 8px;
    width: 300px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}
.alert-popup-ok-button {
    font-family: 'Comic Sans MS', sans-serif;
    margin-top: 2rem;
    padding: 0.75rem;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform .2s, filter .2s;
    color: white;
    background-color:#ff2c2c;
    margin-left: .5rem;
}
.alert-popup-ok-button:hover {
    transform: scale(1.1);
    filter: brightness(1.02);
}
.alert-popup-ok-button:active {
    transform: scale(.9);
    filter: brightness(.9);
} 



/* Home Style */
.home-section {
    padding: 4rem 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}
.home-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    width: 100%;
}
.home-content {
    margin-top: 2rem;
    margin-bottom: 2rem;
    display: flex;
}
.home-content-left-side {
    width: 500px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.home-app-logo {
    margin: 2.75rem 0;
    width: 330px;
    height: 330px;
    border-radius: 10px;
}
.home-content-right-side {
    justify-content: center;
    align-items: center;
    text-align: center;
    display:flex;
    flex-direction: column;
    width: 500px;
    margin-left: 0;
}
.home-title {
    font-size: 2.5rem;
    font-family: 'Comic Sans MS', sans-serif;
    color: #ff2c2c;
    margin-top: 19.2px;
}
.home-description {
    font-size: 1.2rem;
    font-family: 'Comic Sans MS', sans-serif;
    color: #555;
}
.home-explore {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    text-align: center;
    width: 100%;
}
.home-explore-topics-item {
    border: 2px solid #a5cc4f;
}
.home-explore-topics-title {
    color: #a5cc4f;
}
.home-explore-calculators-item {
    border: 2px solid #f3d058;
}
.home-explore-calculators-title {
    color: #f3d058;
}
.home-explore-quizz-item {
    border: 2px solid #341ec2;
}
.home-explore-quizz-title {
    color: #341ec2;
}
.home-explore-ranking-item {
    border: 2px solid #6A0DAD;
}
.home-explore-ranking-title {
    color: #6A0DAD;
}
.home-explore-progress-item {
    border: 2px solid #dc3513;
}
.home-explore-progress-title {
    color: #dc3513;
}
.home-explore-profile-item {
    border: 2px solid #555;
}
.home-explore-profile-title {
    color: #555;
}
.hidden-card {
    display: block;
}



/* Index Style */
.index-entry-buttons {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2.2rem;
    margin-bottom: 33px;
}
.index-button {
    padding: 1rem 1.5rem;
    font-size: 1.2rem;
    font-family: 'Comic Sans MS', sans-serif;
    text-decoration: none;
    border-radius: 12px;
    transition: filter .3s, transform 0.3s ease-in-out;
}
.login-button {
    color: #555;
    background-color: #e0e0e0;
}
.home-button {
    color: white;
    background-color: #ff4f4f;
}
.index-button:hover {
    filter: brightness(1.02);
    transform: scale(1.1);
}
.index-button:active {
    filter: brightness(.9);
    transform: scale(.9);
}



/* Signup Style */
.signup-section {
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
}
.signup-container {
    max-width: 500px;
    display: flex;
    align-items: center;
    flex-direction: column;
    text-align: center;
    font-family: 'Comic Sans MS', sans-serif;
    color: #555;
}
.signup-container form {
    display: flex;
    flex-direction: column;
    max-width: 500px;
}
form#signup-form {
    width: 100%;
}
.signup-container label {
    margin-top: 1rem;
    text-align: left;
}
.signup-container input, .profile-section input {
    width: 100%;
    padding: 0.8rem;
    margin-top: 0.25rem;
    border: 1px solid #ccc;
    border-radius: 10px;
    box-sizing: border-box;
    font-family: 'Comic Sans MS', sans-serif;
    color: #333
}
.signup-container input:focus {
    outline: none;
    border-color: #ff2c2c;
}
.signup-name-fields {
    display: flex;
    gap: 2rem;
    margin-top: 1rem;
}
.signup-name-fields > div {
    flex: 1;
    text-align: left;
}
.signup-submit-button {
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.75rem;
    background-color: #ff2c2c;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform .2s, filter .2s;
}
.signup-submit-button:hover {
    transform: scale(1.02);
    filter: brightness(1.02);
}
.signup-submit-button:active {
    transform: scale(.9);
    filter: brightness(.9);
}

.signin-google {
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.75rem;
    background-color: #4285f4;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform .2s, filter .2s;
}
.signin-google:hover {
    transform: scale(1.02);
    filter: brightness(1.02);
}
.signin-google:active {
    transform: scale(.9);
    filter: brightness(.9);
}

.button-start {
    text-decoration: none;
    display: inline-block;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.75rem;
    color: #555;
    background-color: #e0e0e0;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform .2s, filter .2s;
}
.button-start:hover {
    transform: scale(1.02);
    filter: brightness(1.02);
}
.button-start:active {
    transform: scale(.9);
    filter: brightness(.9);
}

.signup-separator {
    margin-top: 1.5rem;
    margin-bottom: .5rem;
}



/* Account Style */
.profile-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    font-family: 'Comic Sans MS', sans-serif;
}
.profile-card {
    background-color: #FFD6D6;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 1.5rem 0;
    width: 600px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 1rem auto;
    overflow: hidden;
}
.profile-card-title {
    font-family: 'Arial', sans-serif;
    font-weight: bold;
    font-size: 2.25rem;
    color: #555;
    margin-top: 0rem;
    margin-bottom: 1.5rem;
    width: 92%;
}
.profile-card-content {
    width: 100%;
    display: flex;
    flex-direction: row;
    margin: 0;
    padding: 0;
}

.profile-left {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    text-align: center;
    max-width: 12rem;
    gap: 1rem;
}
.profile-picture-background {
    width: 9rem;
    height: 9rem;
    aspect-ratio: 1/1;
    border-radius: 10%;
    display: block;
    object-fit: cover;
    line-height: 150px;
    background-color: #ffffff;
}
.profile-picture {
    width: 100%;
    height: 100%;
    aspect-ratio: 1/1;
    border-radius: 10%;
    object-fit: cover;
    line-height: 150px;
    margin: 0;
    display: block;
}
.profile-picture.default {
    filter: brightness(.2);
}
.profile-picture-url-input {
    width: 9rem !important;
}
.joined-date {
    font-style: italic;
    margin-top: 0px;
    margin-bottom: 0;
}
.joined-date-responsive {
    display: none;
}

.profile-right {
    flex: 2;
    padding-left: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    margin-right: 1.5rem;
    width: 100%;
}
.profile-right.edit {
    text-align: left;
}
.profile-right > * {
    margin-top: 0;
    margin-bottom: 0;
}
.profile-card-name {
    font-size: 1.75rem;
}
.profile-card-username {
    font-weight: bold;
    color: #1da1f2;
    font-size: 1.25rem;
}
.profile-card-email {
    font-size: 1.25rem;
}
.profile-edit-action-buttons {
    width: 92%;
    margin-top: 0 !important;
}
.profile-edit-action-buttons > * {
    font-family: 'Comic Sans MS', sans-serif;
    width: 100%;
    margin: 1.5rem auto 0 auto;
    padding: 0.75rem 0;
    background-color: #ff2c2c;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform .2s, filter .2s;
    text-decoration: none;
}
.profile-edit-cancel-button {
    color: #333;
    background-color: #eee;
}
.profile-edit-save-button {
    color: white;
    background-color:#ff2c2c;
}
.profile-edit-action-buttons > *:hover {
    transform: scale(1.1);
    filter: brightness(1.02);
}
.profile-edit-action-buttons > *:active {
    transform: scale(.9);
    filter: brightness(.9);
}
.account-edit-button {
    width: 92%;
    margin: 1.5rem auto 0 auto;
    padding: 0.75rem 0;
    background-color: #ff2c2c;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform .2s, filter .2s;
    text-decoration: none;
}
.account-edit-button:hover {
    transform: scale(1.02);
    filter: brightness(1.02);
}
.account-edit-button:active {
    transform: scale(.9);
    filter: brightness(.9);
}

.logout-button {
    margin-top: 2rem;
    padding: 0.75rem;
    color: #ff2c2c;
    background-color: white;
    border: solid #ff2c2c;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform .2s, filter .2s;
}
.logout-button:hover {
    transform: scale(1.1);
    filter: brightness(1.1);
}
.logout-button:active {
    transform: scale(.9);
    filter: brightness(.9);
}
.logout-popup-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.logout-popup-content {
    background: white;
    padding: 20px;
    border-radius: 8px;
    width: 300px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}
.logout-popup-button {
    font-family: 'Comic Sans MS', sans-serif;
    margin-top: 2rem;
    padding: 0.75rem;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform .2s, filter .2s;
}
.logout-popup-cancel-button {
    color: #333;
    background-color: #e0e0e0;
    margin-right: .5rem;
}
.logout-popup-ok-button {
    color: white;
    background-color:#ff2c2c;
    margin-left: .5rem;
}
.logout-popup-button:hover {
    transform: scale(1.1);
    filter: brightness(1.02);
}
.logout-popup-button:active {
    transform: scale(.9);
    filter: brightness(.9);
}



/* Topic Style */
.learn-section {
    padding: 2rem;
    text-align: center;
}
.learn-container {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 3rem;
}
.learn-item {
    text-align: center;
    margin: 1rem;
    padding: 1rem;
    background-color: #f0f0f0;
    border-radius: 10px;
    transition: transform 0.3s ease-in-out, filter .3s ease-in-out;
    width: 180px;
    color: white;
}
.learn-item:hover {
    transform: scale(1.1);
    filter: brightness(1.02);
}
.learn-item:active {
    transform: scale(.9);
    filter: brightness(.9);
}
.learn-item > h2 {
    height: 33.6px;
    margin: 19.92px 0;
}
.limit-item {
    border: 2px solid #f2b82e;
}
.limit-title {
    color: #f2b82e;
}
.derivative-item {
    border: 2px solid #63c280;
}
.derivative-title {
    color: #63c280;
}
.integral-item {
    border: 2px solid #244058;
}
.integral-title {
    color: #244058;
}

.learn-container a {
    text-decoration: none;
    color: inherit;
}
.learn-img {
    width: 150px;
    height: 150px;
    aspect-ratio: 1/1;
    display: inline-block;
    color: #555;
    background-color: white;
    margin-bottom: 1rem;
}
.learn-item h2 {
    font-size: 1.5rem;
    font-family: 'Comic Sans MS', sans-serif;
    transition: color 0.3s;
}
.content-section {
    padding: 2rem;
}

.topic-limit-title {
    font-size: 2.5rem;
    font-family: 'Comic Sans MS', sans-serif;
    text-align: center;
    color: #f2b82e;
    margin-bottom: 27.2px;
}
.topic-derivative-title {
    font-size: 2.5rem;
    font-family: 'Comic Sans MS', sans-serif;
    text-align: center;
    color: #63c280;
    margin-bottom: 27.2px;
}
.topic-integral-title {
    font-size: 2.5rem;
    font-family: 'Comic Sans MS', sans-serif;
    text-align: center;
    color: #244058;
    margin-bottom: 27.2px;
}
.topic-limit-background {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border-radius: 8px;
    background-color: #efe5ce;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
.topic-derivative-background {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border-radius: 8px;
    background-color: #c0efcf;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
.topic-integral-background {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border-radius: 8px;
    background-color: #d1e7fb;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.topic-content {
    font-size: 1.2rem;
    font-family: 'Comic Sans MS', sans-serif;
    color: #555;
    line-height: 1.6;
}
.topic-content > :first-child {
    margin-top: 0;
}
.topic-content > :last-child {
    margin-bottom: 0;
}
.topic-content-media {
    padding-top: 28.125%;
    position: relative;
    overflow: hidden;
    width:50%;
}
.topic-content-media-iframe {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
    border: none;
}
.topic-content-media-source {
    margin-top: 0.5rem;
}
.topic-content h1 {
    font-family: 'Comic Sans MS', sans-serif;
    color: #333;
    line-height: 1.6;
}



/* Calculator Styles */
.calculator-action {
    display: flex;
    align-items: flex-end;
    gap: 1rem
}
.calculator-input-container {
    display: flex;
    flex-direction: column;
    width: 20%;
    min-width: 8rem;
}
.calculator input {
    font-family: 'Comic Sans MS', sans-serif;
    padding: .8rem;
    margin-top: .25rem;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 10px;
}
.calculator button {
    font-family: 'Comic Sans MS', sans-serif;
    width: 20%;
    min-width: 8rem;
    padding: .8rem;
    margin-top: .25rem;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 10px;
    cursor: pointer;
    transition: transform .2s, filter .2s;
}
.eq {
    display: none;
}
.calculator button p {
    margin: 0 0;
}
.calculator button:hover {
    transform: scale(1.02);
    filter: brightness(1.02);
}
.calculator button:active {
    transform: scale(.95);
    filter: brightness(.95);
}
.calculator#limit button {
    background-color: #f2b82e;
    color: white;
}
input#limit-function:focus, input#limit-x:focus {
    outline: 2px solid #f2b82e;
}
.calculator#derivative button {
    background-color: #63c280;
    color: white;
}
input#derivative-function:focus {
    outline: 2px solid #63c280;
}
.calculator#integral button {
    color: white;
    background-color: #244058;
}
input#integral-function:focus, input#integral-lower:focus, input#integral-upper:focus {
    outline: 2px solid #244058;
}
#integral-result-function {
    margin-bottom: 8px;
}
.calculator-result-graph-title {
    margin-bottom: .5rem;
}
.calculator-result-graph-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
    line-height: 0;
}
.calculator-result-graph {
    background-color: #fff;
    width: 100%;
    border-radius: 10px;
}
.calculator-result-graph-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10px;
}
.calculator-history-item-container {
    display: flex;
    flex-direction: column-reverse;
    gap: 1.5rem;
}
.calculator-history-item {
    width: 100%;
    text-align: left;
    font-family: 'Comic Sans MS', sans-serif;
    font-size: 19.2px;
    padding: 0 1rem;
    color: #555;
    background-color: white;
    border: 1px solid #ccc;
    border-radius: 10px;
    cursor: pointer;
    transition: transform .2s, filter .2s;
}
.calculator-history-item:hover {
    transform: scale(1.01);
    filter: brightness(1.02);
}
.calculator-history-item:active {
    transform: scale(.99);
    filter: brightness(.95);
}


/* Quiz Style */
.quiz-section {
    padding: 2rem;
    text-align: center;
    align-items: center;
    justify-content: center;
}
.quiz-container {
    width: 1000px;
    text-align: center;
}

.quiz-start-item {
    border: 2px solid #81aeb3;
}
.quiz-start-title {
    color: #81aeb3;
}
.quiz-multiple-choice-item {
    border: 2px solid #ed853b;
}
.quiz-multiple-choice-title {
    color: #ed853b;
}
.quiz-drag-and-drop-item {
    border: 2px solid #20B2AA;
}
.quiz-drag-and-drop-title {
    color: #20B2AA;
}
.quiz-fill-in-the-blanks-item {
    border: 2px solid #6a8d9d;
}
.quiz-fill-in-the-blanks-title {
    color: #6a8d9d;
}

.quiz-topic {
    margin-bottom: 2rem;
}
.quiz-topic-title {
    font-size: 2rem;
}
.quiz-question {
    text-align: left;
    font-size: 1.2rem;
    font-family: 'Comic Sans MS', sans-serif;
    color: #333;
    margin-bottom: 1rem;
}

.quiz-answer-options {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.quiz-answer-option {
    display: flex;
    align-items: center;
    font-size: 1.2rem;
    font-family: 'Comic Sans MS', sans-serif;
    color: #555;
}
.quiz-answer-option input[type="radio"] {
    margin-right: 1rem;
}
.quiz-answer-option input[type="radio"]:checked {
    accent-color: #ed853b;
    color: #ed853b
}

.quiz-drag-and-drop-draggable-piece {
    padding: 5px;
    margin: 0;
    background-color: #a6dcd6;
    border: 1px solid #20b2aa;
    border-radius: 5px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 40px;
    box-sizing: border-box;
    cursor: grab;
}
.quiz-drag-and-drop-undraggable-piece {
    cursor: not-allowed;
    background-color: #ddd;
    border-color: #aaa;
}
.quiz-drag-and-drop-pieces-area {
    display: flex;
    height: 40px;
    gap: 10px;
}
.quiz-drag-and-drop-drop-area {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    border: 2px dashed #ddd;
    padding: 10px;
    justify-content: center;
}
.quiz-drag-and-drop-drop-slot {
    display: inline-block;
    width: 80px;
    height: 40px;
    margin: 0 5px;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
    text-align: center;
    line-height: 40px;
    border-radius: 5px;
    position: relative;
    overflow: hidden;
    vertical-align: middle;
}
.quiz-drag-and-drop-drop-slot .quiz-drag-and-drop-draggable-piece {
    width: 100%;
    height: 100%;
}

.quiz-fill-in-the-blanks-input {
    width: 80px;
    height: 40px;
    margin: 0 5px;
    color: #555;
    background-color: #f0f0f0;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: 'Comic Sans MS', sans-serif;
    font-size: 19.2px;
    text-align: center;
}
.quiz-fill-in-the-blanks-input:focus {
    outline: none;
    border-color: #6a8d9d;
}
.quiz-fill-in-the-blanks-input:not(:placeholder-shown) {
    background-color: #d9e2e6;
    border-color: #6a8d9d;
}
.quiz-fill-in-the-blanks-input:disabled {
    cursor: not-allowed;
    background-color: #ddd;
    border-color: #aaa;
}

.quiz-buttons {
    width: 100%;
    display: flex;
    justify-content: center;
}
.quiz-submit-button {
    font-family: 'Comic Sans MS', sans-serif;
    color: white;
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 1rem;
    transition: .2s transform .2s, filter .2s;
}
#quiz-again-button {
    width: fit-content;
}

.quiz-multiple-choice-button {
    background-color: #ed853b;
}
.quiz-drag-and-drop-button {
    background-color: #20B2AA;
}
.quiz-fill-in-the-blanks-button {
    background-color: #6a8d9d;
}

.quiz-submit-button:hover {
    transform: scale(1.1);
    filter: brightness(1.1);
}
.quiz-submit-button:active {
    transform: scale(.9);
    filter: brightness(.9);
}

.quiz-result, .quiz-review {
    margin-top: 2rem;
    padding: 1.5rem;
    border-radius: 8px;
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
.quiz-review-question {
    margin-top: 2rem;
    margin-bottom: .5rem;
    padding: 1rem;
    border-radius: 8px;
    background-color: #f9f9f9;
}
.quiz-review-answer {
    margin-left: 1rem;
    font-family: 'Comic Sans MS', sans-serif;
}

.quiz-correct-answer {
    color: #4caf50;
    font-weight: bold;
}
.quiz-incorrect-answer {
    color: #f44336;
    font-weight: bold;
}
.quiz-correct-answer::before {
    content: "Correct answer: ";
    font-weight: normal;
    color: #555;
}
.quiz-correct-drag-and-drop-answer::before {
    content: "Correct order: " !important;
}
.quiz-user-answer::before {
    content: "Your answer: ";
    font-weight: normal;
    color: #555;
}
.quiz-user-drag-and-drop-answer::before {
    content: "Your order: " !important;
}



/* About Style */
.about-section {
    margin-top: 2rem;
    padding: 4rem 2rem;
    text-align: center;
}
.about-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.about-it {
    font-size: 1.2rem;
    font-family: 'Comic Sans MS', sans-serif;
    color: #555;
    max-width: 600px;
}



/* Responsive Style */
@media (max-width: 1200px) {
    /* Home Style */
    .home-content {
        flex-direction: column;
        align-items: center;
        margin-top: 0;
        margin-bottom: 0;
        gap: 1rem;
    }
    .home-content-left-side {
        width: fit-content;
    }
    .home-app-logo {
        width: 200px;
        height: 200px;
        margin-right: auto;
    }
    .home-content-right-side {
        width: fit-content;
    }
}

@media (max-width: 1140px) {
    /* Calculator Style */
    .eq {
        display: block;
    }
    .cal {
        display: none;
    }
}

@media (max-width: 950px) {
    /* Navigation Style */  
    .nav-links {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 68px;
        right: 0;
        background-color: #ff2c2c;
        width: 100%;
        text-align: center;
        opacity: 0;
        transform: translateY(-20px);
        pointer-events: none;
        transition: opacity .3s ease, transform .3s ease, background-color .3s ease;
    }
    .nav-active .nav-links {
        opacity: 1;
        transform: translateY(0);
        background-color: #ff4040bb;
        pointer-events: auto;
    }
    .nav-links li {
        margin: 1rem 0;
    }
    .nav-active .nav-links {
        display: flex;
    }
    .right-side-navbar {
        display: flex;
        align-items: center;
    }
    .hamburger-menu {
        display: flex;
    }
    .hamburger-menu .bar {
        width: 25px;
        height: 3px;
        background-color: white;
        margin: 4px 0;
        transition: transform 0.3s, opacity 0.3s;
    }
    .hamburger-menu.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .hamburger-menu.active .bar:nth-child(2) {
        opacity: 0;
    }
    .hamburger-menu.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    .profile-icon-wrapper {
        margin-left: 1rem;
    }



    /* Topic Style */
    .learn-container {
        flex-direction: column;
        gap: 2rem;
    }
    .hidden-card {
        display: none;
    }
    .topic-content-media {
        padding-top: 56.25%;
        position: relative;
        overflow: hidden;
        width:100%;
    }
}

@media (max-width: 768px) {
    /* Calculator Style */
    .calculator-action {
        align-items: normal;
        flex-direction: column;
    }
    .calculator-input-container, .calculator button {
        width: 100%;
    }
    .cal {
        display: block;
    }
    .eq {
        display: none;
    }
}

@media (max-width: 700px) {
    /* Account Style */
    .profile-card {
        width: 90%;
    }
    .profile-card-content {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 92%;
    }
    .profile-left {
        display: flex;
        padding-right: 0;
        border-right: none;
        padding-bottom: .5rem;
        max-width: 100%;
        width: 100%;
    }
    .profile-left-content-edit {
        text-align: left !important;
        display: flex;
        flex-direction: column;
        width: 100%;
        margin-bottom: 1rem;
    }
    .profile-picture-url-input {
        width: 100% !important;
    }
    .joined-date.normal {
        display: none;
    }
    .joined-date-responsive {
        display: block;
    }
    .profile-right {
        padding-left: 0;
        padding-top: .5rem;
        margin-right: 0;
        gap: 2rem;                    
    }
}

@media (max-width: 374px) {
    /* Navigation Style */
    .app-icon {
        display: none;
    }
}