/* What every page shares: colours, type, the header and footer, buttons, and the command field. */

:root {
    /* The page is light or dark with the system, unless the visitor chose the other with the button for
       it: then the page's root says which. Every colour that differs is written once, as light-dark(). */
    color-scheme: light;
    /* 1 in the dark appearance and 0 in the light one, for what isn't a colour. */
    --dark: 0;
    /* Whether what only shows by day, or only by night, moves. */
    --by-day: running;
    --by-night: paused;

    --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "Segoe UI", Roboto, Arial, sans-serif;
    --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

    --background: light-dark(#ffffff, #111214);
    --background-tinted: light-dark(#f5f5f7, #18191c);
    --surface: light-dark(#ffffff, #1e1f23);
    --text: light-dark(#1d1d1f, #f5f5f7);
    --text-secondary: light-dark(#6e6e73, #a1a1a6);
    --text-tertiary: light-dark(#6f6f74, #8a8a90);
    --separator: light-dark(rgba(0, 0, 0, 0.1), rgba(255, 255, 255, 0.12));
    --fill: light-dark(rgba(0, 0, 0, 0.05), rgba(255, 255, 255, 0.07));
    --fill-strong: light-dark(rgba(0, 0, 0, 0.09), rgba(255, 255, 255, 0.12));
    --accent: light-dark(#1563e8, #5aa2ff);
    --header: light-dark(rgba(255, 255, 255, 0.78), rgba(17, 18, 20, 0.76));

    --content: 1120px;
    --gutter: 24px;
    --header-height: 52px;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --dark: 1;
        --by-day: paused;
        --by-night: running;
    }
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --dark: 1;
    --by-day: paused;
    --by-night: running;
}

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-padding-top: calc(var(--header-height) + 16px);
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font: 16px/1.55 var(--font);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    text-underline-offset: 0.18em;
}

button {
    margin: 0;
    padding: 0;
    border: 0;
    background: none;
    color: inherit;
    font: inherit;
    cursor: pointer;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

code,
pre {
    font-family: var(--mono);
}

img,
svg {
    display: block;
}

[hidden] {
    display: none !important;
}

/* There for whoever has the page read out, and nowhere on the screen. */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
}

/* The way past the header and the list of pages, for the keyboard: on the screen only when it is on it. */
.skip-link {
    position: absolute;
    top: 8px;
    left: 8px;
    z-index: 30;
    padding: 8px 14px;
    border-radius: 8px;
    background: var(--surface);
    box-shadow: 0 0 0 1px var(--separator);
    font-size: 14px;
    transform: translateY(-200%);
}

.skip-link:focus {
    transform: none;
}

.symbols {
    position: absolute;
}

.container {
    width: 100%;
    max-width: calc(var(--content) + 2 * var(--gutter));
    margin-inline: auto;
    padding-inline: var(--gutter);
}

/* The header of every page but the landing page, whose hero has a menu bar of its own. */

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    height: var(--header-height);
    border-bottom: 1px solid var(--separator);
    background: var(--header);
    -webkit-backdrop-filter: saturate(1.8) blur(20px);
    backdrop-filter: saturate(1.8) blur(20px);
}

.site-header .container {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 100%;
}

.site-brand {
    display: flex;
    align-items: center;
    gap: 9px;
    margin-right: 10px;
    color: var(--text);
    font-size: 16px;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.site-brand:hover {
    text-decoration: none;
}

.site-nav {
    display: flex;
    gap: 2px;
    margin-right: auto;
}

.site-nav a {
    padding: 5px 10px;
    border-radius: 7px;
    color: var(--text-secondary);
    font-size: 14px;
}

.site-nav a:hover,
.site-nav a[aria-current] {
    color: var(--text);
    text-decoration: none;
}

.site-nav a:hover {
    background: var(--fill);
}

/* The button that turns the page from one appearance to the other: the sun by day, the moon by night.
   It is hidden until the script that makes it work is there. */
.appearance {
    display: grid;
    place-items: center;
}

.appearance svg {
    grid-area: 1 / 1;
    width: 16px;
    height: 16px;
    transition:
        opacity 0.3s,
        transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.appearance-sun {
    opacity: calc(1 - var(--dark));
    transform: rotate(calc(var(--dark) * 90deg));
}

.appearance-moon {
    opacity: var(--dark);
    transform: rotate(calc((var(--dark) - 1) * 90deg));
}

.site-header .appearance {
    width: 32px;
    height: 32px;
    margin-right: 6px;
    border-radius: 50%;
    color: var(--text-secondary);
    transition:
        background-color 0.15s,
        color 0.15s;
}

.site-header .appearance:hover {
    background: var(--fill);
    color: var(--text);
}

/* Buttons are capsules, as push buttons are on macOS. */

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 22px;
    border-radius: 999px;
    font-size: 16px;
    font-weight: 500;
    white-space: nowrap;
    transition: background-color 0.15s, transform 0.15s;
}

.button:hover {
    text-decoration: none;
}

.button:active {
    transform: scale(0.98);
}

.button-small {
    min-height: 30px;
    padding: 0 14px;
    font-size: 13px;
}

.button-primary {
    background: #1f6bf3;
    color: #fff;
}

.button-primary:hover {
    background: #175fe0;
}

.button-plain {
    background: var(--fill);
    color: var(--text);
}

.button-plain:hover {
    background: var(--fill-strong);
}

/* A command to copy, in a field. */

.command {
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 100%;
    padding: 5px 5px 5px 16px;
    border: 1px solid var(--separator);
    border-radius: 12px;
    background: var(--surface);
}

.command code {
    flex: 1;
    min-width: 0;
    overflow-x: auto;
    font-size: 13.5px;
    line-height: 34px;
    white-space: nowrap;
    scrollbar-width: none;
    background: none !important;
}

.command code::-webkit-scrollbar {
    display: none;
}

.command-copy {
    flex: none;
    min-width: 64px;
    height: 34px;
    padding: 0 12px;
    border-radius: 8px;
    background: var(--fill);
    font-size: 13px;
    font-weight: 500;
    transition: background-color 0.15s;
}

.command-copy:hover {
    background: var(--fill-strong);
}

.command-copy.is-copied {
    color: var(--accent);
}

.site-footer {
    border-top: 1px solid var(--separator);
    color: var(--text-secondary);
    font-size: 13px;
}

.site-footer .container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 24px;
    padding-block: 28px;
}

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

.site-footer nav {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 20px;
}

.site-footer a {
    color: var(--text-secondary);
}

.site-footer a:hover {
    color: var(--text);
}

.not-found {
    display: grid;
    place-items: center;
    align-content: center;
    gap: 6px;
    min-height: 60vh;
    padding: 64px var(--gutter);
    text-align: center;
}

.not-found h1 {
    margin: 0;
    font-size: 34px;
    letter-spacing: -0.02em;
}

.not-found p {
    margin: 0 0 18px;
    color: var(--text-secondary);
}

@media (max-width: 560px) {
    :root {
        --gutter: 18px;
    }
}

/* Too narrow for everything in the header: the way to the download is on the page itself. */
@media (max-width: 380px) {
    .site-header .button {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}