@font-face {
    font-family: InterVariable;
    font-style: normal;
    font-weight: 100 900;
    font-display: swap;
    src: url("font/InterVariable.woff2") format("woff2");
}

@font-face {
    font-family: InterVariable;
    font-style: italic;
    font-weight: 100 900;
    font-display: swap;
    src: url("font/InterVariable-Italic.woff2") format("woff2");
}

@font-face {
    font-family: 'Fira Code VF';
    src: url('font/FiraCode-VF.woff2') format('woff2-variations');
    font-weight: 300 700;
    font-style: normal;
}

:root {

    --c-gray: #6c757d;
    --c-gray-dark: #343a40;
    --c-gray-100: #f8f9fa;
    --c-gray-200: #e9ecef;
    --c-gray-300: #dee2e6;
    --c-gray-400: #ced4da;
    --c-gray-500: #adb5bd;
    --c-gray-600: #6c757d;
    --c-gray-700: #495057;
    --c-gray-800: #343a40;
    --c-gray-900: #212529;
    --c-active: royalblue;
    --c-primary: seagreen;
    --c-success: darkgreen;
    --c-secondary: mediumpurple;
    --c-warning: orange;
    --c-danger: firebrick;
    --c-light: #f8f9fa;
    --c-dark: #212529;
    --c-muted: #495057;

    --input-outline: 1px solid var(--c-light);
    --input-border: 2px solid var(--c-gray);
    --input-border-radius: 0.5em;
    --input-background-color: black;
    --disabled-opacity: 0.3;

    --font-ui: 'InterVariable', sans-serif;
    --font-input: 'Fira Code VF', 'Comic Sans MS';
    --font-size: 16px;

    color-scheme: dark;

    font-family: var(--font-ui);
    font-size: var(--font-size);
    line-height: 1;
}

body {
    max-width: 60em;
    margin: auto;
    background-color: var(--c-dark);
}

@media (width < 60em) {
    body {
        margin: 5px;
    }
}

footer {
    display: flex;
    flex-direction: column;
    row-gap: 0.5em;
    align-items: center;
    justify-content: center;
    margin-top: 3em;
    margin-bottom: 1em;
    text-align: center;
}

hr {
    max-width: 60em;
    margin-top: 1em;
    margin-bottom: 1em;
    height: 1px;
    background-color: var(--c-gray-dark);
    border: none;
}

a {
    cursor: pointer;
    color: var(--c-active);
    text-decoration: none;
    outline-offset: 2px;
}

a:hover {
    text-decoration: underline;
}

a:focus {
    outline: var(--input-outline);
}

a > svg {
    color: var(--c-light);
}

button {
    font-family: var(--font-ui);
    font-size: var(--font-size);
    white-space: nowrap;
    background-color: var(--c-gray-dark);
    color: var(--c-light);
    padding: 0.4em 0.4em;
    border-width: 1px;
    border-style: solid;
    border-color: var(--c-gray);
    border-radius: var(--input-border-radius);
}

button:hover:not(:disabled) {
    filter: brightness(120%);
}

button:disabled {
    cursor: not-allowed;
    opacity: var(--disabled-opacity);
}

button:not(:disabled) {
    cursor: pointer;
}

button:focus {
    outline: var(--input-outline);
}

button:active {
    transform: scale(0.96);
}

button > span {
    margin-left: 0.5em;
}

.button-danger:hover {
    background-color: var(--c-danger);
}

.button-danger:focus {
    background-color: var(--c-danger);
}

.button-success:hover {
    background-color: var(--c-success);
}

.button-success:focus {
    background-color: var(--c-success);
}

form:focus {
    outline: none;
}

input {
    font-family: var(--font-input);
    font-size: var(--font-size);
    padding: 0.4em;
    background-color: var(--input-background-color);
    border: var(--input-border);
    border-radius: var(--input-border-radius);
}

input:read-only {
    background-color: var(--c-muted);
}

input:disabled {
    opacity: var(--disabled-opacity);
}

input:focus {
    outline: var(--input-outline);
}

textarea {
    font-family: var(--font-input);
    font-size: var(--font-size);
    padding: 0.4em;
    background-color: var(--input-background-color);
    border: var(--input-border);
    border-radius: var(--input-border-radius);
    white-space: pre-wrap;
    min-width: 20em;
    min-height: 10em;
}

textarea:disabled {
    opacity: var(--disabled-opacity);
}

textarea:focus {
    outline: var(--input-outline);
}

select {
    font-family: var(--font-ui);
    font-size: var(--font-size);
    padding: 0.4em;
    background-color: var(--input-background-color);
    border: var(--input-border);
    border-radius: var(--input-border-radius);
}

select:disabled {
    opacity: var(--disabled-opacity);
}

select:focus {
    outline: var(--input-outline);
}

h1 {
    font-size: 1.5rem;
    font-weight: normal;
    text-align: center;
    margin-block: 1rem;
}

label {
    font-weight: lighter;
}

.title {
    font-size: 1.25rem;
    text-align: center;
    color: var(--c-gray-500);
}

.mt-1 {
    margin-top: 1em !important;
}

.mt-2 {
    margin-top: 2em !important;
}

.mb-1 {
    margin-bottom: 1em !important;
}

.mb-2 {
    margin-bottom: 2em !important;
}

.mb-05 {
    margin-bottom: 0.5em !important;
}

.ml-1 {
    margin-left: 1em !important;
}

.ml-05 {
    margin-left: 0.5em !important;
}

.mr-1 {
    margin-right: 1em !important;
}

.icon {
    width: 1em;
    height: 1em;
    vertical-align: -0.125em;
}

.flex-panel-centered {
    display: flex;
    flex-wrap: wrap;
    row-gap: 0.5em;
    column-gap: 0.5em;
    align-items: center;
    justify-content: center;
    margin-top: 1em;
    margin-bottom: 1em;
    text-align: center;
}

.flex-panel-simple {
    display: flex;
    row-gap: 0.5em;
    column-gap: 0.5em;
    align-items: center;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

.avatar-image {
    border-radius: 10%;
    border-color: var(--c-gray-500);
    border-style: solid;
    border-width: 1px;
}

.primary {
    color: var(--c-primary);
}

.warning {
    color: var(--c-warning);
}

.danger {
    color: var(--c-danger);
}

.minor {
    color: var(--c-gray);
}

.light {
    font-weight: lighter;
}

.small {
    font-size: smaller;
}

.tiny {
    font-size: x-small;
}

.large {
    font-size: larger;
}

.comment {
    font-size: smaller;
    font-style: italic;
    font-weight: normal;
    color: var(--c-gray);
}

.hidden {
    display: none;
}

dialog {
    background-color: var(--c-dark);
    border: var(--input-border);
    border-radius: 0.5em;
    box-shadow: 0 0 0.5em 0.2em var(--c-gray-dark);
}

dialog::backdrop {
    backdrop-filter: brightness(0.5);
}

.dialog-close-button {
    position: absolute;
    top: 0.4em;
    right: 0.4em;
    padding: 0.1em;
}

.grid-form {
    display: grid;
    grid-template-columns: auto;
    column-gap: 0.5em;
    row-gap: 1em;
    align-items: center;
    justify-content: left;
}

@keyframes highlight {
    0% {
        background-color: var(--c-gray);
    }
    100% {
        background-color: inherit;
    }
}

.highlight-effect {
    animation: highlight 2s;
}

.lesson-hint-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 1em;
    line-height: 1.5;
}

.lesson-hint-answer {
    font-family: var(--font-input);
    font-variant-ligatures: none;
    color: var(--c-secondary);
    margin-top: 1em;
    font-size: larger;
    height: 2em;
}

.lesson-input {
    width: 30em;
    text-align: center;
    font-size: larger;
    margin-top: 1em;
    margin-bottom: 0.5em;
}

@keyframes lesson-correct {
    0% {
        background-color: var(--c-success);
    }
    100% {
        background-color: var(--input-background-color);
    }
}

.lesson-correct-effect {
    animation: lesson-correct 333ms;
}

@keyframes lesson-mistake {
    0% {
        background-color: var(--c-danger);
    }
    100% {
        background-color: var(--input-background-color);
    }
}

.lesson-mistake-effect {
    animation: lesson-mistake 333ms;
}

.lesson-button {
    min-width: 12em;
}

.loading {
    color: var(--c-warning);
    font-style: italic;
}

@keyframes request-in-progress {
    from {
        left: 0;
    }
    to {
        left: 100%;
    }
}

.request-bar {
    display: block;
    position: fixed;
    z-index: 100;
    height: 4px;
    width: 10%;
    top: 0;
    background-color: var(--c-success);
    animation: request-in-progress ease-in-out 2s;
    animation-iteration-count: infinite;
}

.scroll-button {
    position: fixed;
    right: 2rem;
}

.scroll-button-top {
    bottom: 5rem;
}

.scroll-button-end {
    bottom: 2rem;
}

.intro {
    text-align: center;
    margin-top: 2em;
    margin-bottom: 2em;
    font-style: italic;
    font-weight: lighter;
}

.intro div {
    margin-top: 1em;
    margin-bottom: 1em;
}

.google-login {
    cursor: pointer;
    height: 3em;
}

.dict-entry {
    line-height: 1.5;
}

.dict-first-line {
    display: flex;
    column-gap: 0.5em;
    align-items: baseline;
    margin-left: 1em;
    font-family: var(--font-input);
}

.dict-first-line > button {
    align-self: center;
}

.dict-trans {
    margin-left: 6em;
}

.icons-gallery {
    display: grid;
    grid-template-columns: auto auto;
    column-gap: 0.5em;
    row-gap: 1em;
    align-items: center;
    justify-content: center;
}

.ai-item-value {
    font-style: italic;
    color: var(--c-secondary);
}

.ai-item-value > strong {
    font-size: large;
}

.ai-item-item {
    font-style: italic;
    color: var(--c-primary);
}

.ai-item-item > strong {
    font-size: large;
}