/* Tokens */
:root {
    color-scheme: light;
    --content-width: 900px;
    --gutter: 1.25rem;
    --space-small: 0.5rem;
    --space-medium: 1rem;
    --space-large: 2rem;
    --text-color: #30302e;
    --link-color: #7a4a2a;
    --background-color: #f3e9d2;
    --surface-color: #ebdfc2;
    --border-color: #d3c3a0;
    --header-text-color: var(--text-color);
    --header-background-color: var(--background-color);
    --header-border-color: var(--border-color);
    --header-button-border-color: var(--border-color);
    --button-text-color: var(--text-color);
    --button-background-color: var(--background-color);
    --button-border-color: var(--border-color);
    --button-hover-color: var(--surface-color);
    --header-button-hover-color: var(--surface-color);
    --current-text-color: #fff;
    --current-color: var(--link-color);
}

@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
        --text-color: #cecdc3;
        --link-color: #a8b4bc;
        --background-color: #1c1b1a;
        --surface-color: #282726;
        --border-color: #6f6e69;
        --header-text-color: #cecdc3;
        --header-background-color: #282726;
        --header-border-color: transparent;
        --header-button-border-color: var(--header-text-color);
        --button-text-color: var(--header-text-color);
        --button-background-color: var(--header-background-color);
        --button-border-color: transparent;
        --button-hover-color: #343331;
        --header-button-hover-color: #343331;
        --current-text-color: var(--header-text-color);
        --current-color: #3b505b;
    }
}

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

body {
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    font-family: Arial, sans-serif;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--background-color);
}

a {
    color: var(--link-color);
    text-underline-offset: 0.15em;
}

a:not([href]) {
    color: inherit;
}

:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 3px;
}

input:focus-visible {
    outline-color: var(--text-color);
    outline-offset: 0;
}

h1, h2, h3 {
    line-height: 1.25;
    margin: var(--space-large) 0 var(--space-medium);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.125rem; }

p, ul, ol, dl {
    margin: 0 0 var(--space-medium);
}

ul, ol {
    padding-left: 1.5rem;
}

li + li {
    margin-top: var(--space-small);
}

summary {
    cursor: pointer;
}

/* Shared layout */
.content, .site-header-inner, .site-footer {
    width: min(var(--content-width), calc(100% - 2 * var(--gutter)));
    margin-inline: auto;
}

.site-header {
    padding-block: var(--space-medium);
    border-bottom: 1px solid var(--header-border-color);
    color: var(--header-text-color);
    background-color: var(--header-background-color);
}

.site-header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-medium);
}

.site-header h1 {
    margin-block: 0;
}

.site-header button {
    border-color: var(--header-button-border-color);
    color: var(--header-text-color);
    background-color: var(--header-background-color);
}

.site-header button:hover {
    background-color: var(--header-button-hover-color);
}

.site-header a {
    color: inherit;
    text-decoration: none;
}

.site-header .commit {
    margin-left: auto;
    font-size: 0.875rem;
}

.site-header :focus-visible {
    outline-color: var(--header-text-color);
}

.content {
    padding-block: var(--space-large);
    overflow-wrap: anywhere;
}

.content > :first-child {
    margin-top: 0;
}

.site-footer {
    padding-block: var(--space-medium);
    font-size: 0.875rem;
}

.site-footer p {
    margin-block: 0;
}

/* Controls */
input, select, button {
    font: inherit;
    padding: var(--space-small) var(--space-medium);
    border: 1px solid var(--border-color);
    border-radius: 3px;
}

input, select {
    min-width: 0;
    max-width: 100%;
    color: var(--text-color);
    background-color: var(--surface-color);
}

button {
    cursor: pointer;
    border-color: var(--button-border-color);
    color: var(--button-text-color);
    background-color: var(--button-background-color);
}

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

.search-form {
    display: flex;
    align-items: stretch;
    gap: var(--space-small);
    margin-bottom: var(--space-large);
}

.search-form input {
    flex: 1;
    max-width: 410px;
}

.search-form button {
    flex-shrink: 0;
}

/* Dictionary listings and navigation */
.dictionaries {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
    gap: var(--space-large);
    align-items: start;
}

.column {
    min-width: 0;
}

.column > :first-child {
    margin-top: 0;
}

.column ul {
    padding-left: 0.875rem;
    list-style-type: square;
}

.nav {
    margin-bottom: var(--space-large);
}

.nav summary {
    padding-block: var(--space-small);
}

.nav > a {
    display: inline-block;
    margin: var(--space-small) var(--space-medium) 0 0;
}

.terms-wrap, .contents-wrap {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: var(--space-medium) var(--space-large);
}

.terms-wrap > ul, .contents-wrap > ul {
    flex: 1 1 12rem;
    min-width: 0;
    padding: 0;
    list-style: none;
}

.pages, .page-nav > ul {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-small);
    margin: var(--space-large) 0 0;
    padding: 0;
    list-style: none;
}

.page-nav > ul {
    margin-top: var(--space-small);
}

.page-nav li + li {
    margin-top: 0;
}

.pages a, .page-nav a, .page-nav li:not(:has(a)) {
    display: inline-block;
    padding: var(--space-small);
}

/* academic.ru marks the current page as a bare <li> without a link */
.pages a.current, .page-nav li:not(:has(a)) {
    border-radius: 3px;
    color: var(--current-text-color);
    background-color: var(--current-color);
    text-decoration: none;
}

h3:target {
    outline: 2px solid var(--link-color);
    outline-offset: 4px;
    scroll-margin-top: var(--space-medium);
}

/* Search results and articles */
.search-results {
    padding: 0;
    list-style: none;
}

.search-results > li + li {
    margin-top: var(--space-large);
}

.search-results > li > a {
    font-weight: bold;
}

.search-results p {
    margin: var(--space-small) 0 0;
}

.definition {
    font-size: 1.0625rem;
    line-height: 1.6;
}

.definition > :where(p, dl, ul, ol, blockquote, div) {
    max-width: 70ch;
}

.definition > dt {
    margin-bottom: var(--space-medium);
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 1.25;
}

.definition dd dt {
    margin-top: var(--space-medium);
    font-weight: bold;
}

.definition dd {
    margin-left: 0;
}

.thumbcaption {
    margin-bottom: var(--space-medium);
    font-size: 0.875rem;
}

/* academic.ru sizes images with inline styles, which the CSP blocks */
.content img, .content audio, .content video {
    max-width: 100%;
}

.content img, .content video {
    height: auto;
}

.content img[width$="%"] {
    width: 12rem;
    margin: 0 var(--space-small) var(--space-small) 0;
}

.content table, .content pre {
    display: block;
    max-width: 100%;
    overflow-x: auto;
}

.content table {
    width: fit-content;
    margin-bottom: var(--space-medium);
    border-collapse: collapse;
}

.content th, .content td {
    padding: var(--space-small);
    border: 1px solid var(--border-color);
    text-align: left;
    vertical-align: top;
    overflow-wrap: normal;
}

.content :where(th, td) > :last-child {
    margin-bottom: 0;
}

.toc h2 {
    margin-top: 0;
}

@media (max-width: 600px) {
    .search-form {
        flex-direction: column;
    }

    .search-form input {
        width: 100%;
        max-width: none;
    }

    /* They cover the right column of dictionary contents */
    body:has(.terms-wrap, .contents-wrap) .scroll-buttons {
        display: none;
    }
}

.scroll-buttons {
    position: fixed;
    right: var(--space-medium);
    bottom: var(--space-medium);
    display: flex;
    flex-direction: column;
    gap: var(--space-small);
}

.scroll-buttons[hidden] {
    display: none;
}

.scroll-buttons button {
    width: 3.5rem;
    height: 3.5rem;
    padding: 0;
    border-radius: 0;
    font-size: 1.5rem;
    line-height: 1;
}