html,
body {
    margin: 0;
}

body {
    --primary-bg: #fdfeff;
    --primary-text: #111111;
    --secondary-bg: #eeeef3;
    --secondary-text: #9b9b9b;
    --hover-bg: #dde1e5;
    --active-bg: #cdcfd2;

    --dark-primary-bg: #141516;
    --dark-primary-text: #ebebeb;
    --dark-secondary-bg: #30373a;
    --dark-secondary-text: #a4a7a9;
    --dark-hover-bg: #474c50;
    --dark-active-bg: #626569;
}

.dark {
    --primary-bg: var(--dark-primary-bg);
    --primary-text: var(--dark-primary-text);
    --secondary-bg: var(--dark-secondary-bg);
    --secondary-text: var(--dark-secondary-text);
    --hover-bg: var(--dark-hover-bg);
    --active-bg: var(--dark-active-bg);
}

@media (prefers-color-scheme: dark) {
    body:not(.light) {
        --primary-bg: var(--dark-primary-bg);
        --primary-text: var(--dark-primary-text);
        --secondary-bg: var(--dark-secondary-bg);
        --secondary-text: var(--dark-secondary-text);
        --hover-bg: var(--dark-hover-bg);
        --active-bg: var(--dark-active-bg);
    }
}

body {
    font-family: system-ui, sans-serif;
    color: var(--primary-text);
    background: var(--primary-bg);

    display: flex;
    flex-direction: column;
    min-height: 100vh;
    border-bottom: 8px solid #111111;
}

input,
button,
textarea {
    font-size: 1em;
    padding: .5em .8em;
    color: var(--primary-text);
    font-family: system-ui, sans-serif;
    tab-size: 4;
}

input::placeholder,
textarea::placeholder {
    color: var(--secondary-text);
}

header,
h1,
main {
    width: calc(100% - 32px);
    max-width: 860px;
    margin: 1em auto;
}

header {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}

header .logo {
    font-weight: bold;
}

nav {
    display: flex;
    flex-direction: row-reverse;
    align-items: center;
    gap: 1em;
}

header a,
header button {
    display: inline;
    cursor: pointer;
    color: var(--primary-text);
    background: transparent;
    border: 0;
    border-radius: 0;
    text-decoration: none;
    padding: .5em 0;
}

header a:hover,
header button:hover {
    text-decoration: underline;
}

h1 {
    margin-top: 0.75em;
    margin-bottom: 0.25em;
    line-height: 1.4em;
}

main {
    margin-bottom: 3em;
}

.about p,
.about li {
    max-width: 64ch;
    line-height: 1.5em;
}

.about a {
    color: inherit;
}

.about a:hover {
    background: var(--hover-bg);
}

form {
    position: relative;
    margin-bottom: 2em;
    overflow: hidden;
}

form input,
form textarea {
    display: block;
    border-radius: 6px;
    border: 0;
    background: var(--hover-bg);
    width: 100%;
    box-sizing: border-box;
}

form textarea {
    min-height: 50vh;
    line-height: 1.5em;
    resize: vertical;
}

form input:hover,
form input:focus,
form textarea:hover,
form textarea:focus {
    outline: 0;
}

form button[type="submit"] {
    border-radius: 6px;
    border: 0;
    color: var(--primary-bg);
    background: var(--primary-text);
    margin-top: .5em;
    float: right;
    cursor: pointer;
}

form button[type="submit"]:hover {
    background: var(--secondary-text);
}

.pageControls {
    float: right;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    gap: .75em;
}

.pageControls a {
    color: var(--primary-text);
    text-decoration: none;
}

.pageControls a:hover {
    text-decoration: underline;
}

a.pageButton {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5em;
    height: 1.5em;
    width: 1.5em;
    border-radius: 50%;
    background: var(--secondary-bg);
}

a.pageButton:hover {
    background: var(--hover-bg);
    text-decoration: none;
}

.message {
    font-style: italic;
    color: var(--secondary-text);
    margin-bottom: 2em;
}

.update {
    margin-bottom: 2.5em;
    word-break: break-word;
}

.update .update-t {
    font-size: 14px;
    color: var(--secondary-text);
    margin-bottom: -.5em;
}

.update .update-t a {
    color: var(--secondary-text);
    text-decoration: none;
}

.update .update-t a:hover {
    text-decoration: underline;
}

.update-t .relativestamp {
    margin-bottom: 6px;
}

/* update Markdown */

.update h1,
.update h2,
.update h3 {
    margin: .75em 0 .5em 0;
    line-height: 1.4em;
}

.update h1 {
    font-size: 1.75em;
}

.update h2 {
    font-size: 1.5em;
}

.update h3 {
    font-size: 1.2em;
}

.update h4,
.update h5,
.update h6 {
    font-size: 1em;
}

.update p,
.update li {
    line-height: 1.5em;
    max-width: 64ch;
}

.update strike {
    color: var(--secondary-text);
}

.update img {
    max-width: 100%;
    max-height: 500px;
    border-radius: 6px;
}

.update a {
    color: var(--primary-text);
    text-decoration: underline;
}

.update ul,
.update ol {
    padding-left: 3ch;
}

.update pre,
.update code {
    background: var(--hover-bg);
    font-size: 1em;
    font-family: 'IBM Plex Mono', 'Menlo', 'Monaco', monospace;
    /*
     * In Safari (2021), word-break: break-word from `.update` combined with
     * certain contents of <pre> tags that do not begin lines with whitespace
     * break line-wrapping behavior. This inversion of word-break works around
     * that Safari bug (or at least, what appears to be a browser bug, as
     * Chrome does not reproduce).
     */
    word-break: initial;
}

.update pre {
    border-radius: 6px;
    box-sizing: border-box;
    padding: 12px 8px;
    overflow-x: auto;
}

.update code {
    padding: 1px 5px;
    border-radius: 6px;
}

.update pre code {
    padding: 0;
}

.update blockquote {
    margin: 0;
    border-left: 4px solid var(--active-bg);
    padding-left: 1em;
    display: block;
}

@media only screen and (min-width: 760px) {
    .update {
        display: flex;
        flex-direction: row;
        align-items: flex-start;
        justify-content: space-between;
        margin-bottom: 1.5em;
    }
    .update-t {
        flex-grow: 0;
        flex-shrink: 0;
        width: 134px;
        margin-top: 3px;
    }
    .update-s {
        width: 0;
        flex-grow: 1;
        flex-shrink: 1;
    }
    .update-s :first-child {
        margin-top: 0;
    }
}