/*
 * Wireframe stylesheet: shows function, not form. Branding comes later.
 *
 * Black on white, system fonts, square corners. Keep this file small: layout,
 * reading typography and clear controls only.
 *
 * Accessibility targets follow the TetraLogical Accessible Components Library:
 * https://tetralogical.com/resources/accessible-components-library/requirements/
 */

/* Foundations -------------------------------------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: #fff;
  color: #000;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.125rem;
  line-height: 1.6;
  overflow-wrap: break-word;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 2em 0 0.5em;
  font-weight: 700;
  line-height: 1.2;
  text-wrap: balance;
}

h1 {
  margin-top: 0;
  font-size: clamp(2rem, 1.5rem + 2.5vw, 3rem);
  line-height: 1.1;
}
h2 {
  font-size: 1.75rem;
}
h3 {
  font-size: 1.375rem;
}
h4 {
  font-size: 1.125rem;
}
h5,
h6 {
  font-size: 1rem;
}

p,
ul,
ol,
dl,
blockquote,
pre,
table,
figure {
  margin: 0 0 1.25em;
}

p,
li,
dd {
  max-width: 68ch;
  text-wrap: pretty;
}

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

li + li {
  margin-top: 0.5em;
}

li > ul,
li > ol {
  margin: 0.5em 0 0;
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 0.2em;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

/* If an image fails to load, set its alt text apart from the surrounding copy. */
img {
  font-style: italic;
  text-align: center;
}

hr {
  margin: 2.5em 0;
  border: 0;
  border-top: 2px solid;
}

blockquote {
  max-width: 68ch;
  padding-left: 1em;
  border-left: 4px solid;
}

blockquote > :last-child,
figure > :last-child,
li > :last-child {
  margin-bottom: 0;
}

figcaption {
  max-width: 68ch;
  margin-top: 0.5em;
  font-size: 0.875em;
  line-height: 1.4;
}

code,
kbd,
samp,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

pre {
  overflow-x: auto;
  padding: 1em;
  border: 2px solid;
}

table {
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

/* Scroll a wrapper, not the table: changing a table's display can drop its semantics. */
.table-container {
  overflow-x: auto;
  margin-bottom: 1.25em;
}

.table-container table {
  margin-bottom: 0;
}

th,
td {
  padding: 0.5em 0.75em;
  border: 2px solid;
  text-align: left;
  vertical-align: top;
}

/* Focus: 3px outline, offset, with a contrasting ring so it shows on any fill. */
:focus-visible {
  outline: 3px solid #000;
  outline-offset: 3px;
  box-shadow: 0 0 0 6px #fff;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Page frame --------------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: -100vh;
  left: 1rem;
  z-index: 1;
  padding: 0.5rem 1rem;
  border: 2px solid;
  background: #fff;
  font-weight: 700;
}

.skip-link:focus {
  top: 1rem;
}

header[role="banner"],
main,
body > footer {
  width: min(100% - 2rem, 72rem);
  margin-inline: auto;
}

header[role="banner"] {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  padding-block: 0.75rem;
  border-bottom: 2px solid;
}

main {
  padding-block: 3rem;
}

body > footer {
  padding-block: 1.5rem;
  border-top: 2px solid;
}

body > footer p {
  margin: 0;
}

.site-title,
nav[aria-label="Site navigation"] a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
}

nav[aria-label="Site navigation"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

nav[aria-label="Site navigation"] li {
  margin: 0;
}

/* Controls ----------------------------------------------------------------- */

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.5em 1.25em;
  border: 2px solid #000;
  border-radius: 0;
  background: #000;
  color: #fff;
  font: inherit;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

button:hover,
.button:hover {
  background: #fff;
  color: #000;
}

.button--secondary {
  background: #fff;
  color: #000;
}

.button--secondary:hover {
  background: #000;
  color: #fff;
}

/* TetraLogical "Text input" pattern. */
label {
  display: block;
  font-weight: 700;
}

.hint {
  margin: 0 0 0.5em;
}

input:not([type="checkbox"], [type="radio"]),
textarea,
select {
  width: 100%;
  min-height: 44px;
  padding: 0.5em;
  border: 2px solid #000;
  border-radius: 0;
  background: #fff;
  color: #000;
  font: inherit;
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline-width: 5px;
  outline-offset: 0;
  box-shadow: inset 0 0 0 2px #000;
}

/* TetraLogical "Pagination" pattern; Ghost gives us previous/next, not a page list. */
.pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px solid;
}

.pagination p {
  margin: 0;
}

/* Signup: Ghost's members script toggles .loading, .success and .error. */
.signup {
  max-width: 34rem;
  margin-block: 2rem 3rem;
  padding: 1.5rem;
  border: 2px solid;
}

.signup__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.signup__row input {
  flex: 1 1 14rem;
  width: auto;
}

.signup__message {
  display: none;
  margin: 1em 0 0;
  font-weight: 700;
}

.signup.loading .signup__message--loading,
.signup.success .signup__message--success,
.signup.error .signup__message--error {
  display: block;
}

/* Bulletin cards and lists -------------------------------------------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
  gap: 1.5rem;
  margin: 0 0 2rem;
  padding: 0;
  list-style: none;
}

/* More space between tappable cards in one column, so scrolling doesn't open one. */
@media (max-width: 25rem) {
  .cards {
    gap: 3rem;
  }
}

.cards > li {
  max-width: none;
  margin: 0;
}

.card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.25rem;
  border: 2px solid;
}

.card .post-meta {
  margin-top: auto;
}

/*
 * Whole-block links (Inclusive Components, "Cards"). The heading link stays the only
 * link and tab stop, so its name is just the title; ::after stretches its clickable
 * area over the block. Trade-off: text inside the block can't be selected.
 */
.stretched {
  position: relative;
}

.stretched :is(h2, h3) a::after {
  content: "";
  position: absolute;
  inset: 0;
}

.stretched:hover {
  outline: 4px solid #000;
  outline-offset: -2px;
}

/* Kept apart from :hover: a browser without :has() drops only this block and the
   link keeps its own focus style. */
.stretched:has(a:focus-visible) {
  outline: 3px solid #000;
  outline-offset: 3px;
  box-shadow: 0 0 0 6px #fff;
}

.stretched:has(a:focus-visible) a:focus-visible {
  outline: none;
  box-shadow: none;
}

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

.card > :last-child {
  margin-bottom: 0;
}

.card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-bottom: 1em;
  object-fit: contain; /* Many bulletin images contain text, so never crop them. */
}

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

.post-list > li {
  max-width: none;
  margin: 0;
  padding-block: 1.5rem;
  border-top: 2px solid;
}

/* Rows already have rules between them: on hover the thicker title underline is enough. */
.post-list > li:hover {
  outline: none;
}

.post-list h2 {
  margin: 0 0 0.25em;
  font-size: 1.5rem;
}

.post-meta {
  font-size: 0.875em;
}

.post-list p {
  margin-bottom: 0.25em;
}

/* Article ------------------------------------------------------------------ */

.article {
  max-width: 68ch;
}

.article__back {
  margin-bottom: 2rem;
}

.article__header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid;
}

.article__header h1 {
  margin-bottom: 0.5em;
}

.article__header p {
  margin: 0;
}

.article__feature {
  margin-bottom: 2.5rem;
}

.prose {
  font-size: 1.1875rem;
  line-height: 1.65;
  hanging-punctuation: first;
}

.prose h2,
.prose h3,
.prose h4,
.prose h5,
.prose h6 {
  margin-top: 2.25em;
}

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

.prose h2 + p,
.prose h3 + p,
.prose h4 + p {
  margin-top: 0;
}

.prose figure {
  margin-block: 2em;
}

/* Ghost requires these editor width classes; the wireframe keeps a single column. */
.kg-width-wide,
.kg-width-full {
  max-width: 100%;
}