/* Typography for long-form posts. Self-contained: post pages do not load
   Bootstrap, which they only ever used for three utility classes. */

:root {
  --measure: 38rem;        /* ~68 characters at the base size */
  --figure-width: 52rem;   /* figures breathe wider than the text column */
  --bg: #fffefb;
  --text: #23211e;
  --muted: #6b6660;
  --rule: #e3ded5;
  --link: #8a4b2a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17171a;
    --text: #e4e0d8;
    --muted: #9b958b;
    --rule: #33323a;
    --link: #d99a6e;
  }
}

html {
  font-size: 100%;
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Charter, "Bitstream Charter", "Iowan Old Style", "Sitka Text",
    Cambria, Georgia, "Times New Roman", serif;
  /* Scales from comfortable on a phone to generous on a desktop. */
  font-size: clamp(1.0625rem, 0.98rem + 0.42vw, 1.1875rem);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* ---- page furniture ---- */

.masthead {
  max-width: var(--figure-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 0;
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.masthead a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.masthead a:hover {
  color: var(--text);
  border-bottom-color: var(--rule);
}

.masthead span {
  opacity: 0.5;
}

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 1.25rem 5rem;
}

/* ---- headings ---- */

h1 {
  margin: 2.5rem 0 0;
  font-size: clamp(2rem, 1.5rem + 2.2vw, 3rem);
  line-height: 1.1;
  font-weight: 600;
  letter-spacing: -0.015em;
}

/* The standfirst: sets up the post, so it reads a size above the body. */
.lead {
  margin: 1.25rem 0 0;
  font-size: 1.15em;
  line-height: 1.5;
  color: var(--muted);
}

h1 + .lead::after,
.lead:last-of-type::after {
  content: "";
  display: block;
  width: 4rem;
  margin: 2rem 0 0;
  border-top: 1px solid var(--rule);
}

h2,
h3,
h4 {
  line-height: 1.25;
  font-weight: 600;
  /* Bound to the text below, separated from the text above. */
  margin: 2.75rem 0 0.75rem;
}

h2 {
  font-size: 1.5em;
}

h3 {
  font-size: 1.2em;
  color: var(--muted);
  letter-spacing: 0.02em;
}

h4 {
  font-size: 1.05em;
}

/* ---- prose ---- */

p {
  /* Ragged right: justified text without hyphenation opens rivers of
     white space, which is what made these posts hard to read. */
  text-align: left;
  margin: 0 0 1.25em;
}

main > p:first-of-type,
h1 + p,
.lead + p {
  margin-top: 1.5rem;
}

a {
  color: var(--link);
  text-underline-offset: 0.15em;
  text-decoration-thickness: 1px;
}

blockquote {
  margin: 2rem 0;
  padding-left: 1.25rem;
  border-left: 2px solid var(--rule);
  color: var(--muted);
  font-style: italic;
}

blockquote p:last-child {
  margin-bottom: 0;
}

hr {
  width: 4rem;
  margin: 3rem auto;
  border: 0;
  border-top: 1px solid var(--rule);
}

/* ---- figures ---- */

figure {
  /* Break out of the text column, but stay within the viewport. */
  width: min(var(--figure-width), 100vw - 2.5rem);
  margin: 2.75rem 0;
  margin-left: calc(50% - min(var(--figure-width), 100vw - 2.5rem) / 2);
}

img {
  /* The posts carry class="image-fluid", which is a typo for Bootstrap's
     img-fluid and therefore styles nothing. Constrain images directly so
     they cannot overflow on narrow screens. */
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 2px;
}

figcaption {
  margin: 0.75rem auto 0;
  max-width: var(--measure);
  font-size: 0.875rem;
  line-height: 1.5;
  font-style: italic;
  color: var(--muted);
  text-align: center;
}

/* ---- index pages ---- */

.page-head {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 0;
}

.page-head h1 {
  margin-top: 0;
}

.page-head .lead::after {
  content: none; /* the card grid provides the separation here */
}

.cards {
  max-width: var(--figure-width);
  margin: 3rem auto 0;
  padding: 0 1.25rem 5rem;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 2.5rem 2rem;
}

.cards a {
  display: block;
  color: inherit;
  text-decoration: none;
}

.cards img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 2px;
  /* Sits back until hovered, so the grid reads as text first. */
  filter: saturate(0.92);
  transition: filter 0.2s ease, transform 0.2s ease;
}

.cards a:hover img {
  filter: saturate(1.05);
  transform: translateY(-2px);
}

.cards h2 {
  margin: 0.9rem 0 0.35rem;
  font-size: 1.15em;
  font-weight: 600;
  line-height: 1.25;
}

.cards a:hover h2 {
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.cards p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ---- footer ---- */

.post-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  border-top: 1px solid var(--rule);
  font-size: 0.9375rem;
}

.post-footer a {
  color: var(--muted);
  text-decoration: none;
}

.post-footer a:hover {
  color: var(--text);
  text-decoration: underline;
}