/* Course wiki styles.
 *
 * Every colour, face and radius comes from the theme's --brand-* custom
 * properties, so a skin recolours all of this by publishing tokens and
 * nothing here has to know which subject it is serving. The skin loads
 * after this file (asset order 200 against 100) and can override any rule.
 *
 * The one thing this file does decide is the reading experience, because
 * that is not a matter of branding: a course wiki is read as documentation,
 * in long stretches, often on a phone in a lab. */

/* ── Course listing ──────────────────────────────────────────────────── */

.courses-index__intro {
    color: var(--brand-muted);
    margin-bottom: 1.5rem;
}

.courses-list {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
}

.courses-card {
    background: var(--brand-surface);
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius);
    padding: 1.1rem 1.2rem;
    display: block;
    color: inherit;
    text-decoration: none;
    /* Restrained on purpose: a list of academic years is navigation, not a
     * shop window. */
    transition: border-color .15s ease, transform .15s ease;
}

.courses-card:hover,
.courses-card:focus-visible {
    border-color: var(--brand-primary);
    transform: translateY(-1px);
    text-decoration: none;
}

.courses-card__name {
    font-family: var(--brand-font-heading);
    color: var(--brand-heading);
    font-size: 1.15rem;
    margin: 0 0 .35rem;
}

.courses-card__meta {
    color: var(--brand-muted);
    font-size: .875rem;
    margin: 0;
}

/* ── Breadcrumbs ─────────────────────────────────────────────────────── */

/* ── Categories and their pages ──────────────────────────────────────── */

.courses-section {
    margin-bottom: 2.25rem;
}

.courses-section__title {
    font-family: var(--brand-font-heading);
    color: var(--brand-heading);
    font-size: 1.3rem;
    margin: 0 0 .25rem;
    padding-bottom: .4rem;
    border-bottom: 2px solid var(--brand-border);
}

.courses-section__title a {
    color: inherit;
    text-decoration: none;
}

.courses-pages {
    list-style: none;
    padding: 0;
    margin: .75rem 0 0;
}

.courses-pages li {
    border-bottom: 1px solid var(--brand-border);
}

.courses-pages li:last-child {
    border-bottom: 0;
}

.courses-pages a {
    display: block;
    /* A comfortable target for a finger, which is how a lab script gets
     * opened five minutes before the session. */
    padding: .6rem .25rem;
    color: var(--brand-text);
    text-decoration: none;
}

.courses-pages a:hover {
    color: var(--brand-primary);
    background: var(--brand-surface);
}

.courses-empty {
    color: var(--brand-muted);
    font-style: italic;
    padding: .75rem 0;
}

/* ── The Withheld badge ──────────────────────────────────────────────── */

/* Staff only: readers never receive a withheld item. It has to be obvious
 * at a glance without shouting, because staff see it constantly while a
 * course is being prepared. */
.courses-badge {
    display: inline-block;
    font-size: .75rem;
    font-weight: 600;
    letter-spacing: .02em;
    padding: .12rem .45rem;
    border-radius: var(--brand-radius);
    border: 1px dashed var(--brand-muted);
    color: var(--brand-muted);
    background: transparent;
    margin-left: .5rem;
    vertical-align: middle;
    white-space: nowrap;
}

.courses-badge--scheduled {
    border-style: solid;
    border-color: var(--brand-accent);
    color: var(--brand-accent);
}

/* ── Search ──────────────────────────────────────────────────────────── */

.courses-search {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    align-items: center;
    margin-bottom: 1.5rem;
}

.courses-search input[type="search"],
.courses-search input[type="text"] {
    flex: 1 1 14rem;
    min-width: 0;
    padding: .5rem .7rem;
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius);
    background: var(--brand-bg);
    color: var(--brand-text);
    font-family: inherit;
}

.courses-search select {
    padding: .5rem .6rem;
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius);
    background: var(--brand-surface);
    color: var(--brand-text);
}

.courses-search__hint {
    flex: 1 1 100%;
    color: var(--brand-muted);
    font-size: .85rem;
}

.courses-results {
    list-style: none;
    padding: 0;
}

.courses-results li {
    padding: .75rem 0;
    border-bottom: 1px solid var(--brand-border);
}

.courses-results__where {
    display: block;
    color: var(--brand-muted);
    font-size: .8rem;
}

/* ── Attachments ─────────────────────────────────────────────────────── */

/* The files are the material, so they are a first-class block on the page
 * rather than a line of links at the bottom. */
.courses-attachments {
    margin-top: 2rem;
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius);
    background: var(--brand-surface);
    padding: 1rem 1.1rem;
}

.courses-attachments__title {
    font-family: var(--brand-font-heading);
    color: var(--brand-heading);
    font-size: 1rem;
    margin: 0 0 .6rem;
}

.courses-attachments ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.courses-attachments li + li {
    margin-top: .4rem;
}

.courses-attachments a {
    color: var(--brand-primary);
    text-decoration: none;
    word-break: break-word;
}

.courses-attachments a:hover {
    text-decoration: underline;
}

/* ── The page body ───────────────────────────────────────────────────── */

/* .prose was previously defined only in the blog feature's stylesheet,
 * which a course wiki does not install, so the typography of every
 * migrated page depends on this block. */
.prose {
    /* Around 70 characters, the measure long technical prose is read at
     * without the eye losing the line. */
    max-width: 42rem;
    color: var(--brand-text);
    font-family: var(--brand-font-body);
    font-size: 1.02rem;
    line-height: 1.7;
}

.prose > * + * {
    margin-top: 1.1em;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
    font-family: var(--brand-font-heading);
    color: var(--brand-heading);
    line-height: 1.25;
    margin-top: 2em;
    margin-bottom: .6em;
}

.prose h1 { font-size: 1.8rem; }
.prose h2 {
    font-size: 1.4rem;
    padding-bottom: .25rem;
    border-bottom: 1px solid var(--brand-border);
}
.prose h3 { font-size: 1.15rem; }
.prose h4 { font-size: 1rem; }

.prose a {
    color: var(--brand-primary);
    text-decoration: underline;
    text-underline-offset: .15em;
}

.prose ul,
.prose ol {
    padding-left: 1.4rem;
}

.prose li + li {
    margin-top: .3em;
}

.prose blockquote {
    margin-left: 0;
    padding: .1rem 0 .1rem 1rem;
    border-left: 3px solid var(--brand-border);
    color: var(--brand-muted);
}

.prose img {
    max-width: 100%;
    height: auto;
    border-radius: var(--brand-radius);
}

.prose hr {
    border: 0;
    border-top: 1px solid var(--brand-border);
}

/* Code. A course on software engineering is mostly commands and snippets,
 * so this is not a detail. */
.prose code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: .9em;
    padding: .12em .35em;
    border-radius: 4px;
    background: var(--brand-surface);
    color: var(--brand-accent);
    word-break: break-word;
}

.prose pre {
    background: var(--brand-surface);
    border: 1px solid var(--brand-border);
    border-left: 3px solid var(--brand-primary);
    border-radius: var(--brand-radius);
    padding: .9rem 1rem;
    /* Long command lines scroll inside the block instead of widening the
     * page, which would break every phone. */
    overflow-x: auto;
}

.prose pre code {
    background: none;
    color: inherit;
    padding: 0;
    font-size: .875rem;
    line-height: 1.55;
    word-break: normal;
}

/* Tables. The migrated material has plenty, and some are wide. */
.prose table {
    width: 100%;
    border-collapse: collapse;
    font-size: .95rem;
    display: block;
    overflow-x: auto;
}

.prose th,
.prose td {
    border: 1px solid var(--brand-border);
    padding: .45rem .6rem;
    text-align: left;
    vertical-align: top;
}

.prose th {
    background: var(--brand-surface);
    color: var(--brand-heading);
    font-family: var(--brand-font-heading);
}

/* Anchors the markdown renderer adds to headings, revealed on hover so
 * they do not clutter the reading view. */
.prose .header-anchor {
    opacity: 0;
    margin-left: .35rem;
    text-decoration: none;
}

.prose h1:hover .header-anchor,
.prose h2:hover .header-anchor,
.prose h3:hover .header-anchor,
.prose h4:hover .header-anchor,
.prose .header-anchor:focus-visible {
    opacity: .5;
}

/* Task lists, which the renderer emits with checkboxes. */
.prose input[type="checkbox"] {
    margin-right: .4rem;
}

.prose ul.contains-task-list {
    list-style: none;
    padding-left: .2rem;
}

/* ── A page, with the rest of its course beside it ──────────────────────────
   Two columns on a wide screen, one on a narrow one, and the aside goes
   underneath rather than above when they stack: someone who opened a lab
   script came for the script. */
.course-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 2.5rem;
}

@media (min-width: 1000px) {
    .course-layout {
        grid-template-columns: minmax(0, 1fr) 17rem;
        align-items: start;
    }
}

.course-layout__main {
    min-width: 0;
}

/* The aside scrolls with the page, deliberately. It used to be sticky with
   an internal scrollbar, and a scrollbar inside a menu is two scrollbars on
   one screen: the reader's wheel grabs whichever one the cursor happens to
   be over, and a fourteen-section course showed a permanent bar down the
   middle of the layout. A panel that moves with the document has neither
   problem, and the page's own scrollbar is the one the reader already has. */

.course-aside__block + .course-aside__block {
    margin-block-start: 2rem;
}

.course-aside__title {
    font-size: .72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .09em;
    color: var(--brand-muted);
    margin: 0 0 .75rem;
}

.course-aside__section + .course-aside__section {
    margin-block-start: 1.1rem;
}

.course-aside__section-name {
    display: block;
    font-size: .9rem;
    font-weight: 600;
    color: var(--brand-heading);
    margin-block-end: .35rem;
}

.course-aside__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.course-aside__list li + li {
    margin-block-start: .1rem;
}

.course-aside__link {
    display: block;
    font-size: .875rem;
    line-height: 1.45;
    color: var(--brand-muted);
    padding: .22rem 0 .22rem .7rem;
    /* A rule down the left, which fills in on the page being read. Quieter
       than a background block and it survives a long title wrapping. */
    border-inline-start: 2px solid var(--brand-border);
}

.course-aside__link:hover {
    color: var(--brand-primary);
    border-inline-start-color: color-mix(in srgb, var(--brand-primary) 45%, transparent);
    text-decoration: none;
}

.course-aside__link.is-current {
    color: var(--brand-primary);
    font-weight: 600;
    border-inline-start-color: var(--brand-primary);
}

/* Which section a recent page belongs to. Said quietly, because the title is
   what a reader is scanning for. */
.course-aside__where {
    display: block;
    font-size: .75rem;
    color: var(--brand-muted);
    padding-inline-start: .7rem;
}

.course-aside__list--recent li + li {
    margin-block-start: .55rem;
}