/* Convivy — text-first, no frameworks, no JS.
   Warm editorial register: cream ground, deep green ink, gold dawn accents.
   Headings in Outfit, long-form prose in Newsreader, UI meta in Inter. */

:root {
  /* Brand palette (carried from the original convivy.com inline styles). */
  --color-bg: #faf8f2;           /* cream ground */
  --color-bg-alt: #f1ece0;       /* light tint for code/badge surfaces */
  --color-text: #1f2a24;         /* near-black green ink */
  --color-text-muted: #5a6660;
  --color-accent: #2f6b4f;       /* green */
  --color-accent-hover: #234f3a; /* deep green */
  --color-accent-2: #c9892a;     /* gold — decorative use */
  --color-accent-2-text: #8a5a14;/* darkened gold for text-size uses (AA on cream) */
  --color-border: #e5e0d2;
  --color-footer: #22382c;       /* footer band: deep brand green */
  --color-footer-text: #e9e5d8;
  --color-footer-muted: #a9b5aa;

  --font-heading: "Outfit", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --measure: 66ch;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  /* A faint dawn glow at the top of the page — warm gold light on cream. */
  background:
    radial-gradient(120% 24rem at 50% -6rem, rgba(201, 137, 42, 0.09), rgba(201, 137, 42, 0) 70%),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
  text-decoration-color: color-mix(in srgb, var(--color-accent) 45%, transparent);
  transition: color 120ms ease, text-decoration-color 120ms ease;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration-color: currentColor;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 10;
  padding: 0.5rem 0.9rem;
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: 0 0 6px 6px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  text-decoration: none;
  transition: top 120ms ease;
}

.skip-link:focus-visible {
  top: 0;
  color: var(--color-bg);
  outline-offset: 0;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--color-border);
}

.site-header-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.4rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: -0.015em;
  text-decoration: none;
  color: var(--color-text);
}

.site-title:hover {
  color: var(--color-accent);
}

.site-logo {
  display: block;
  width: 40px;
  height: 40px;
  border-radius: 9px;
  box-shadow: 0 1px 2px rgba(31, 42, 36, 0.18);
}

.site-nav {
  display: flex;
  gap: 1.4rem;
}

.site-nav a {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1rem;
  text-decoration: none;
  color: var(--color-text-muted);
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
  transition: color 120ms ease, border-color 120ms ease;
}

.site-nav a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent-2);
}

/* ---------- Main column ---------- */

main {
  flex: 1;
  width: 100%;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 3.5rem 1.5rem 5rem;
}

/* ---------- Headings ---------- */

h1, h2, h3 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.3rem, 6vw, 3.1rem);
  line-height: 1.1;
  margin: 0 0 1.5rem;
}

h2 {
  font-size: 1.45rem;
  font-weight: 600;
  margin: 3rem 0 1rem;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 2.25rem 0 0.75rem;
}

/* A short gold dawn-tick above section headings. */
.prose h2::before {
  content: "";
  display: block;
  width: 2rem;
  height: 3px;
  border-radius: 999px;
  background: var(--color-accent-2);
  margin-bottom: 0.85rem;
}

/* Section headings that are links (e.g. “## [Field Notes](/fieldnotes/)”)
   keep heading ink and reveal green + underline on hover. */
h2 a {
  color: inherit;
  text-decoration: none;
}

h2 a:hover {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-decoration-color: var(--color-accent-2);
  text-underline-offset: 0.2em;
}

.kicker {
  margin: 0 0 0.85rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

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

.kicker a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-2);
  text-underline-offset: 0.25em;
}

/* ---------- Long-form prose ---------- */

.prose {
  font-family: var(--font-serif);
  font-size: 1.175rem;
  line-height: 1.72;
}

.prose p {
  margin: 0 0 1.3rem;
}

/* The opening line reads as a standfirst. */
.home > h1 + p,
.people > h1 + p {
  font-size: 1.45rem;
  line-height: 1.5;
  font-weight: 500;
  color: var(--color-accent-hover);
  margin-bottom: 1.6rem;
}

.prose em {
  font-style: italic;
}

.prose ul, .prose ol {
  margin: 0 0 1.3rem;
  padding-left: 1.4rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

.prose hr {
  border: 0;
  height: 1px;
  background: var(--color-border);
  margin: 2.5rem 0;
}

p {
  margin: 0 0 1.25rem;
}

/* ---------- Field Notes front page: index + river ---------- */

.page-header {
  margin-bottom: 2.5rem;
}

.page-header h1 {
  margin-bottom: 0;
}

/* The index: a compact table of contents for the river below. Entries
   jump to the full post inline on this page; the river titles below carry
   the permalinks. Capped with the river, so it never grows past a handful
   of rows — the archive at the foot of the page indexes the rest. */

.post-index {
  margin-bottom: 4rem;
}

.post-index-label {
  margin: 0 0 0.85rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

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

.post-index li {
  border-bottom: 1px solid var(--color-border);
}

.post-index li:first-child {
  border-top: 1px solid var(--color-border);
}

.post-index a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  padding: 0.65rem 0.25rem;
  text-decoration: none;
  color: inherit;
}

.post-index-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--color-text);
  transition: color 120ms ease;
}

.post-index a:hover .post-index-title {
  color: var(--color-accent);
}

.post-index-meta {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.post-index-more {
  margin: 0.85rem 0.25rem 0;
  font-family: var(--font-sans);
  font-size: 0.875rem;
}

.post-index-more a {
  text-decoration: none;
}

.post-index-more a:hover {
  text-decoration: underline;
}

/* The river: the newest posts in full, newest first (build.py's RIVER_CAP). */

.river-post {
  /* Breathing room when an index anchor jumps here. */
  scroll-margin-top: 1.5rem;
}

.river-post + .river-post {
  margin-top: 4rem;
  padding-top: 3.5rem;
  border-top: 1px solid var(--color-border);
}

.river-post-header {
  margin-bottom: 1.75rem;
}

.river-post-title {
  font-size: clamp(1.6rem, 4vw, 1.9rem);
  line-height: 1.15;
  margin: 0 0 0.75rem;
}

/* A gold dawn-tick marks each post's start, echoing the prose h2 tick. */
.river-post-title::before {
  content: "";
  display: block;
  width: 2rem;
  height: 3px;
  border-radius: 999px;
  background: var(--color-accent-2);
  margin-bottom: 0.85rem;
}

/* Body headings in the river are demoted one level (h2 -> h3, ...) so the
   document outline stays valid under the post's h2 title; these rules keep
   their visual size identical to the permalink page. */

.river .prose h3 {
  font-size: 1.45rem;
  font-weight: 600;
  margin: 3rem 0 1rem;
}

.river .prose h3::before {
  content: "";
  display: block;
  width: 2rem;
  height: 3px;
  border-radius: 999px;
  background: var(--color-accent-2);
  margin-bottom: 0.85rem;
}

.river .prose h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.15rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin: 2.25rem 0 0.75rem;
}

.river .prose h5 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.02rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 1.9rem 0 0.6rem;
}

/* The archive: every post beyond the river, grouped by year, linking to
   permalink pages. Deliberately tighter than the top index — this list is
   the part that grows without bound, and it sits after the reading
   content, where a long scannable list is what a reader wants. */

.post-archive {
  margin-top: 5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-border);
}

.post-archive-label {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  scroll-margin-top: 1.5rem;
}

.post-archive-year {
  margin: 1.9rem 0 0.4rem;
  font-size: 1.1rem;
  font-weight: 700;
}

/* The gold dawn-tick marks each year, echoing the river-post tick. */
.post-archive-year::before {
  content: "";
  display: block;
  width: 2rem;
  height: 3px;
  border-radius: 999px;
  background: var(--color-accent-2);
  margin-bottom: 0.6rem;
}

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

.post-archive a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.15rem 1rem;
  padding: 0.38rem 0.25rem;
  text-decoration: none;
  color: inherit;
}

.post-archive-title {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--color-text);
  transition: color 120ms ease;
}

.post-archive a:hover .post-archive-title {
  color: var(--color-accent);
}

.post-archive-meta {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ---------- Meta & authorship marks ---------- */

.post-meta {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.byline-mark {
  display: inline-block;
  margin-left: 0.45rem;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  vertical-align: 0.08em;
}

.authorship-human {
  color: var(--color-accent-hover);
  background: rgba(47, 107, 79, 0.1);
  border: 1px solid rgba(47, 107, 79, 0.35);
}

.authorship-collab {
  color: var(--color-accent-2-text);
  background: rgba(201, 137, 42, 0.12);
  border: 1px solid rgba(201, 137, 42, 0.45);
}

.authorship-llm {
  color: var(--color-text-muted);
  background: rgba(90, 102, 96, 0.1);
  border: 1px solid rgba(90, 102, 96, 0.35);
}

.empty-state {
  margin-top: 3rem;
  padding: 2.75rem 1.5rem;
  border: 1px dashed var(--color-border);
  border-radius: 12px;
  text-align: center;
}

.empty-state p {
  margin: 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

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

.post-header {
  margin-bottom: 2.25rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--color-border);
}

.post-header h1 {
  margin-bottom: 0.75rem;
}

.post-back {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.post-back a {
  text-decoration: none;
}

.post-back a:hover {
  text-decoration: underline;
}

/* ---------- Code & quotes ---------- */

code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--color-bg-alt);
}

code {
  padding: 0.12em 0.4em;
  border-radius: 5px;
  font-size: 0.82em;
}

pre {
  padding: 1.1rem 1.25rem;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  overflow-x: auto;
  line-height: 1.55;
  font-size: 0.86rem;
}

pre code {
  padding: 0;
  background: none;
  font-size: inherit;
}

blockquote {
  margin: 1.75rem 0;
  padding: 0.15rem 0 0.15rem 1.35rem;
  border-left: 3px solid var(--color-accent-2);
  color: var(--color-text-muted);
  font-style: italic;
}

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

table {
  border-collapse: collapse;
  margin: 0 0 1.3rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

th, td {
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

th {
  font-family: var(--font-heading);
  font-weight: 600;
  background: var(--color-bg-alt);
}

/* ---------- Horizon & footer ---------- */

.horizon {
  line-height: 0;
  margin-top: auto;
}

.horizon svg {
  display: block;
  width: 100%;
  height: clamp(44px, 7vw, 80px);
}

.site-footer {
  background: var(--color-footer);
  color: var(--color-footer-text);
}

.site-footer-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2.25rem 1.5rem 2.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 2rem;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-footer-text);
  text-decoration: none;
}

.footer-brand img {
  display: block;
  border-radius: 6px;
}

.footer-brand:hover {
  color: #fff;
}

.footer-nav {
  display: flex;
  gap: 1.4rem;
}

.footer-nav a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-footer-muted);
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--color-footer-text);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.footer-copy {
  margin: 0 0 0 auto;
  font-size: 0.85rem;
  color: var(--color-footer-muted);
}

.site-footer :focus-visible {
  outline-color: var(--color-accent-2);
}

/* ---------- Small screens ---------- */

@media (max-width: 540px) {
  main {
    padding-top: 2.5rem;
    padding-bottom: 3.5rem;
  }

  .site-header-inner {
    padding: 1.1rem 1.25rem;
  }

  .prose {
    font-size: 1.1rem;
  }

  .home > h1 + p,
  .people > h1 + p {
    font-size: 1.3rem;
  }

  .footer-copy {
    margin-left: 0;
    flex-basis: 100%;
  }
}

/* ---------- Motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
  }
}