/**
 * Smoke Signal Blog — the reading room of the calm civic directory.
 *
 * Tokens, faces, and registers are carried over from smokesignal.events
 * (src-js/styles/base/*.css) so the blog reads as the same building; the
 * extensions here are for long-form reading: an article measure, prose
 * rhythm, ruled asides, and the post ledger. Rules, not boxes.
 */

/* --- Faces ----------------------------------------------------------- */
/* Overpass — open descendant of Highway Gothic, the U.S. road-signage
   face; carries the wayfinding register in the masthead, labels, and
   headings. Atkinson Hyperlegible — commissioned by the Braille Institute
   for maximum legibility; sets all reading text. */

@font-face {
  font-family: "Overpass";
  font-style: normal;
  font-weight: 600 800;
  font-display: swap;
  src: url("/static/fonts/overpass-variable.woff2") format("woff2");
}

@font-face {
  font-family: "Atkinson Hyperlegible";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/static/fonts/atkinson-hyperlegible-400.woff2") format("woff2");
}

@font-face {
  font-family: "Atkinson Hyperlegible";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("/static/fonts/atkinson-hyperlegible-400-italic.woff2") format("woff2");
}

@font-face {
  font-family: "Atkinson Hyperlegible";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("/static/fonts/atkinson-hyperlegible-700.woff2") format("woff2");
}

/* --- Tokens ----------------------------------------------------------- */
/* Warm paper neutrals tinted toward the ember hue; one restrained ember
   accent. Both themes come from this sheet via light-dark() — light is a
   reading room at noon, dark is the same room at night. Values match
   smokesignal.events. */

:root {
  color-scheme: light dark;

  /* Surfaces and ink */
  --ss-bg: light-dark(oklch(0.972 0.008 70), oklch(0.215 0.012 55));
  --ss-surface: light-dark(oklch(0.95 0.01 70), oklch(0.255 0.014 55));
  --ss-ink: light-dark(oklch(0.25 0.02 45), oklch(0.93 0.01 70));
  --ss-ink-muted: light-dark(oklch(0.47 0.018 50), oklch(0.73 0.012 60));
  --ss-rule: light-dark(oklch(0.87 0.012 65), oklch(0.36 0.012 55));
  --ss-rule-strong: light-dark(oklch(0.72 0.015 60), oklch(0.48 0.012 55));

  /* Ember accent */
  --ss-link: light-dark(oklch(0.5 0.135 45), oklch(0.76 0.125 55));
  --ss-fill: light-dark(oklch(0.545 0.14 45), oklch(0.66 0.135 50));
  --ss-on-fill: light-dark(oklch(0.985 0.008 70), oklch(0.18 0.015 50));

  /* Type */
  --ss-font-display: "Overpass", "Avenir Next", "Segoe UI", sans-serif;
  --ss-font-body: "Atkinson Hyperlegible", "Verdana", "Segoe UI", sans-serif;
  --ss-font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "Menlo", "Consolas", monospace;

  /* Reading measure */
  --ss-measure: 68ch;
  --ss-radius: 0.1875rem;

  /* Spacing (4pt scale) */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
}

/* --- Base ------------------------------------------------------------- */

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

body {
  margin: 0;
  font-family: var(--ss-font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  background-color: var(--ss-bg);
  color: var(--ss-ink);
  /* Handles and AT-URIs can be long unbroken strings. */
  overflow-wrap: break-word;
}

/* Links are underlined by default so they never rely on hue alone;
   masthead, ledger titles, and footer links opt out where role is clear
   from context. */
a {
  color: var(--ss-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
  text-decoration-color: color-mix(in oklch, var(--ss-link), transparent 40%);
  transition:
    color 120ms ease-out,
    text-decoration-color 120ms ease-out;
}

a:hover {
  text-decoration-color: currentcolor;
  text-decoration-thickness: 1.5px;
}

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

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

/* Wayfinding label: the small all-caps marker used for section anchors
   and date headings. Short strings only. */
.ss-label {
  font-family: var(--ss-font-display);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ss-ink-muted);
}

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

.ss-page {
  max-width: 46rem;
  margin-inline: auto;
  padding-inline: clamp(var(--space-md), 4vw, var(--space-xl));
}

.ss-skip-link {
  position: absolute;
  inset-inline-start: var(--space-md);
  inset-block-start: var(--space-md);
  z-index: 100;
  padding: var(--space-xs) var(--space-md);
  background-color: var(--ss-bg);
  border: 1px solid var(--ss-rule-strong);
  border-radius: var(--ss-radius);
  font-family: var(--ss-font-display);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(calc(-100% - var(--space-xl)));
}

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

/* --- Masthead ----------------------------------------------------------- */

.ss-masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs) var(--space-lg);
  padding-block: var(--space-md);
  border-bottom: 1px solid var(--ss-rule);
}

.ss-masthead-brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-inline-end: auto;
  font-family: var(--ss-font-display);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--ss-ink);
  text-decoration: none;
}

.ss-masthead-brand img {
  border-radius: 3px;
}

.ss-masthead-brand .ss-wing {
  font-weight: 600;
  color: var(--ss-ink-muted);
}

.ss-masthead nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-lg);
}

.ss-masthead nav a {
  font-family: var(--ss-font-display);
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--ss-ink-muted);
  text-decoration: none;
}

.ss-masthead nav a:hover,
.ss-masthead nav a:focus-visible {
  color: var(--ss-link);
}

/* --- Home -------------------------------------------------------------- */

.ss-lede {
  max-width: var(--ss-measure);
  margin-block: var(--space-xl) 0;
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--ss-ink-muted);
}

.ss-lede strong {
  color: var(--ss-ink);
}

/* Post ledger: the accession-log register from the directory, one row per
   post — a quiet date column, then the title. */
.ss-ledger-heading {
  margin-block: var(--space-2xl) var(--space-sm);
  border-top: 1px solid var(--ss-rule-strong);
  padding-top: var(--space-xs);
}

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

.ss-ledger li {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  column-gap: var(--space-sm);
  padding-block: var(--space-sm);
}

.ss-ledger li + li {
  border-top: 1px solid var(--ss-rule);
}

.ss-ledger time {
  font-family: var(--ss-font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ss-ink-muted);
  font-variant-numeric: tabular-nums;
  padding-top: 0.2rem;
}

.ss-ledger a {
  font-family: var(--ss-font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  line-height: 1.35;
  color: var(--ss-ink);
  text-decoration: none;
}

.ss-ledger a:hover,
.ss-ledger a:focus-visible {
  color: var(--ss-link);
}

.ss-empty {
  max-width: var(--ss-measure);
  color: var(--ss-ink-muted);
  border-block: 1px solid var(--ss-rule);
  padding-block: var(--space-lg);
  margin-block: var(--space-md);
}

@media (width <= 30rem) {
  .ss-ledger li {
    display: block;
  }

  .ss-ledger time {
    display: block;
    padding-top: 0;
    margin-bottom: var(--space-2xs);
  }
}

/* --- Post page ----------------------------------------------------------- */

.ss-post-header {
  margin-block: var(--space-2xl) var(--space-xl);
}

.ss-post-header .ss-label {
  display: block;
  margin-bottom: var(--space-sm);
}

.ss-post-title {
  margin: 0;
  font-family: var(--ss-font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 1.5rem + 2.5vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--ss-ink);
}

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

.ss-article {
  font-size: 1.0625rem;
  line-height: 1.65;
}

.ss-article > * {
  max-width: var(--ss-measure);
}

.ss-article p {
  margin-block: 0 var(--space-md);
}

.ss-article h1,
.ss-article h2,
.ss-article h3,
.ss-article h4,
.ss-article h5,
.ss-article h6 {
  font-family: var(--ss-font-display);
  color: var(--ss-ink);
  line-height: 1.2;
  margin-block: var(--space-xl) var(--space-sm);
}

.ss-article h1,
.ss-article h2 {
  font-size: 1.56rem;
  font-weight: 800;
}

.ss-article h3 {
  font-size: 1.22rem;
  font-weight: 700;
}

.ss-article h4,
.ss-article h5,
.ss-article h6 {
  font-size: 1.05rem;
  font-weight: 700;
}

.ss-article ul,
.ss-article ol {
  margin-block: 0 var(--space-md);
  padding-inline-start: 1.5em;
}

.ss-article li {
  margin-block: var(--space-2xs);
}

.ss-article li > ul,
.ss-article li > ol {
  margin-block: var(--space-2xs) 0;
}

/* Set-apart text reads as a ruled notice, not a colored box. */
.ss-article blockquote {
  margin: var(--space-lg) 0;
  padding: var(--space-sm) var(--space-lg);
  border-block: 1px solid var(--ss-rule-strong);
  color: var(--ss-ink-muted);
}

.ss-article blockquote > :last-child {
  margin-bottom: 0;
}

.ss-article hr {
  max-width: var(--ss-measure);
  margin: var(--space-xl) 0;
  border: 0;
  border-top: 1px solid var(--ss-rule-strong);
}

.ss-article img {
  max-width: 100%;
  height: auto;
  border-radius: var(--ss-radius);
  border: 1px solid var(--ss-rule);
}

/* Wide tables scroll within themselves instead of widening the page. */
.ss-article table {
  display: block;
  max-width: max-content;
  overflow-x: auto;
  border-collapse: collapse;
  margin-block: var(--space-lg);
  font-size: 0.9375rem;
}

.ss-article th {
  font-family: var(--ss-font-display);
  font-weight: 700;
  text-align: left;
  border-bottom: 1px solid var(--ss-rule-strong);
}

.ss-article th,
.ss-article td {
  padding: var(--space-xs) var(--space-md) var(--space-xs) 0;
}

.ss-article td {
  border-bottom: 1px solid var(--ss-rule);
}

/* Inline code on the reading surface. */
.ss-article code {
  font-family: var(--ss-font-mono);
  font-size: 0.85em;
  background-color: var(--ss-surface);
  border: 1px solid var(--ss-rule);
  border-radius: var(--ss-radius);
  padding: 0.05em 0.3em;
}

/* Code blocks: colors come from the generated syntax.css themes; the
   hairline keeps the panel legible where theme and paper are close. */
.ss-article pre {
  max-width: 100%;
  margin-block: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--ss-rule);
  border-radius: var(--ss-radius);
  overflow-x: auto;
  line-height: 1.5;
}

.ss-article pre code {
  font-size: 0.875rem;
  background: none;
  border: 0;
  border-radius: 0;
  padding: 0;
}

.ss-article .footnotes {
  margin-top: var(--space-2xl);
  border-top: 1px solid var(--ss-rule-strong);
  padding-top: var(--space-md);
  font-size: 0.9375rem;
  color: var(--ss-ink-muted);
}

.ss-article input[type="checkbox"] {
  accent-color: var(--ss-fill);
}

/* --- Interactions ledger --------------------------------------------------- */

.ss-interactions {
  margin-block: var(--space-2xl);
  border-block: 1px solid var(--ss-rule);
  padding-block: var(--space-md) var(--space-lg);
  max-width: var(--ss-measure);
}

.ss-interactions .ss-label {
  display: block;
  margin-bottom: var(--space-xs);
}

.ss-interactions p {
  margin: 0;
  color: var(--ss-ink-muted);
}

.ss-interactions ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-lg);
  margin: var(--space-xs) 0 0;
  padding: 0;
}

.ss-interactions li a {
  font-family: var(--ss-font-display);
  font-weight: 600;
  font-size: 0.9375rem;
}

/* --- References page --------------------------------------------------------- */

.ss-references {
  list-style: none;
  margin: var(--space-md) 0;
  padding: 0;
}

.ss-references li {
  padding-block: var(--space-sm);
  font-family: var(--ss-font-mono);
  font-size: 0.875rem;
}

.ss-references li + li {
  border-top: 1px solid var(--ss-rule);
}

.ss-backlink {
  font-family: var(--ss-font-display);
  font-weight: 600;
  font-size: 0.9375rem;
}

/* --- Footer -------------------------------------------------------------------- */

.ss-footer {
  margin-top: var(--space-3xl);
  border-top: 1px solid var(--ss-rule);
  padding-block: var(--space-xl) var(--space-2xl);
  color: var(--ss-ink-muted);
  font-size: 0.9375rem;
}

.ss-footer p {
  margin: 0;
}

/* --- Ergonomics ------------------------------------------------------------------ */

@media (pointer: coarse) {
  .ss-masthead nav a,
  .ss-interactions li a,
  .ss-backlink {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
  }
}

@media print {
  .ss-masthead,
  .ss-footer,
  .ss-interactions,
  .ss-skip-link {
    display: none;
  }

  body {
    background: white;
    color: black;
  }
}