/* ─────────────────────────────────────────────────────────────────────────────
   Letters — /letters/ index + /letters/<slug>/ posts
   Layout and rhythm follow letters.thedankoe.com (measured at 1440px):
     index  1100px feature panel (400px tall), 4-up "Most popular" cards,
            600px latest column + 320px sidebar, 17/24 bold section labels
     post   728px column, title right under the nav, 18/24 subtitle 12px below,
            36px avatar byline 20px below, divider bar, body 19/30.4 (1.6),
            20px between paragraphs, section heads 26px above / 16px below
   Type and colour come from the design system (tokens.css, headings.css).
───────────────────────────────────────────────────────────────────────────── */

.letters-page #page-container {
  background: var(--ds-color-page);
}

.letters,
.letter {
  --letters-gold: #c59060;
  --letters-measure: 728px;
  --letters-wide: 1100px;
  --letters-main: 600px;
  --letters-side: 320px;
  box-sizing: border-box;
  padding: 120px 24px 96px;
}

/* Section label: "Most popular", "Latest", "Keep reading" */
#page-container .letters-label {
  margin: 0;
  font-family: var(--ds-font-body) !important;
  font-size: 17px !important;
  line-height: 24px !important;
  font-weight: 700 !important;
  text-transform: none !important;
  letter-spacing: normal;
  color: var(--ds-color-text-strong) !important;
}

.letters-list__meta,
.letters-feature__eyebrow {
  font-family: var(--ds-font-mono);
  font-size: 11px;
  line-height: 16px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ds-color-faint);
}

/* ── Typographic tile (fallback when a letter has no cover) ───────────────── */
.letters-tile {
  display: flex;
  align-items: flex-end;
  box-sizing: border-box;
  padding: 10px;
  border-radius: var(--ds-radius-sm);
  background: var(--ds-color-dark);
  color: var(--ds-color-on-dark);
  font-family: var(--ds-font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  overflow: hidden;
  position: relative;
}
.letters-tile::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 100% 0%, rgba(197, 144, 96, 0.55), transparent 60%);
}
.letters-tile span { position: relative; }
.letters-tile--kickoffs::before { background: radial-gradient(120% 90% at 0% 0%, rgba(245, 217, 176, 0.45), transparent 65%); }
.letters-tile--ai-workflow::before { background: radial-gradient(120% 90% at 50% 0%, rgba(36, 200, 220, 0.35), transparent 60%); }
.letters-tile--career::before { background: radial-gradient(120% 90% at 100% 100%, rgba(197, 144, 96, 0.45), transparent 60%); }

/* ── Index: head ──────────────────────────────────────────────────────────── */
.letters__head {
  max-width: var(--letters-wide);
  margin: 0 auto 24px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
#page-container .letters__title {
  margin: 0;
  font-size: 40px !important;
  line-height: 1 !important;
}
.letters__lede {
  margin: 0;
  max-width: 460px;
  font-size: 15px;
  line-height: 20px;
  color: var(--ds-color-muted);
}

/* ── Index: topic chips ──────────────────────────────────────────── */
.letters-chips {
  margin: 16px 0 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 32px), transparent);
          mask-image: linear-gradient(90deg, #000 calc(100% - 32px), transparent);
  padding-right: 32px;
}
.letters-chips::-webkit-scrollbar { display: none; }
.letters-chips button {
  flex: none;
  height: 40px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  background: var(--ds-color-surface-inset);
  font: 600 14px/1 var(--ds-font-body);
  color: var(--ds-color-text-strong);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.letters-chips button:hover { background: #E4D9D0; }
.letters-chips button[aria-selected="true"] {
  background: var(--ds-color-text-strong);
  color: #fff;
}
.letters-chips__divider {
  flex: none;
  width: 1px;
  height: 24px;
  margin: 0 4px;
  background: var(--ds-color-border);
}
.letters-empty {
  padding: 32px 0;
  color: var(--ds-color-muted);
}

/* ── Index: feature panel (1100 x 400, text bottom-left over the art) ─────── */
.letters-feature {
  position: relative;
  display: block;
  max-width: var(--letters-wide);
  height: 400px;
  margin: 0 auto 48px;
  border-radius: var(--ds-radius-xl);
  overflow: hidden;
  background: var(--ds-color-dark);
  color: var(--ds-color-on-dark);
  text-decoration: none;
  isolation: isolate;
}
.letters-feature__art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  padding: 0;
  z-index: -1;
}
.letters-feature__art.letters-tile span { display: none; }
/* Cover image: sits on the right so the drawing never runs under the text */
img.letters-feature__art {
  left: auto;
  right: 0;
  width: 56%;
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 22%);
          mask-image: linear-gradient(90deg, transparent 0%, #000 22%);
}
.letters-feature:has(img.letters-feature__art)::after { display: none; }
.letters-feature:has(img.letters-feature__art) .letters-feature__text { width: min(440px, calc(100% - 96px)); }
.letters-feature::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.62) 0%, rgba(0, 0, 0, 0.25) 55%, transparent 100%);
}
.letters-feature__text {
  position: absolute;
  left: 48px;
  bottom: 48px;
  width: min(520px, calc(100% - 96px));
  display: flex;
  flex-direction: column;
}
.letters-feature__eyebrow {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 12px;
}
.letters-feature__title {
  font-family: var(--ds-font-display);
  font-weight: var(--ds-font-weight-heading, 700);
  font-size: 40px;
  line-height: 1;
  text-transform: uppercase;
  color: #ffffff;
}
.letters-feature__sub {
  margin-top: 8px;
  font-size: 15px;
  line-height: 20px;
  color: rgba(255, 255, 255, 0.75);
}
.letters-feature__cta {
  color: #ffffff;
  margin-top: 24px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--ds-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.letters-feature__arrow {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #ffffff;
  color: #000000;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--ds-font-body);
  font-size: 16px;
  letter-spacing: 0;
  transition: transform 0.2s ease;
}
.letters-feature:hover .letters-feature__arrow { transform: translateX(3px); }

/* ── Index: most popular (4-up, title + 60px thumb) ───────────────────────── */
.letters-popular {
  max-width: var(--letters-wide);
  margin: 0 auto 64px;
}
.letters-row-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.letters-viewall {
  font-family: var(--ds-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ds-color-muted);
  text-decoration: none;
}
.letters-viewall:hover { color: var(--ds-color-text-strong); }
.letters-popular__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
}
.letters-popular__grid a {
  display: flex;
  flex-direction: column;
  gap: 14px;
  text-decoration: none;
  color: inherit;
}
.letters-popular__text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.letters-popular__title {
  font-size: 15px;
  line-height: 20px;
  font-weight: 700;
  color: var(--ds-color-text-strong);
}
.letters-popular__grid a:hover .letters-popular__title { text-decoration: underline; text-underline-offset: 3px; }
.letters-popular__thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  height: auto;
  object-fit: cover;
  border-radius: var(--ds-radius-lg, 16px);
  transition: transform 0.35s ease;
}
.letters-popular__grid a:hover .letters-popular__thumb { transform: scale(0.98); }
.letters-popular__thumb.letters-tile span { display: none; }
.letters-popular__cat {
  font-size: 13px;
  line-height: 18px;
  color: var(--ds-color-muted);
}

/* ── Index: latest (600) + sidebar (320) ──────────────────────────────────── */
.letters-columns {
  max-width: calc(var(--letters-main) + var(--letters-side) + 32px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, var(--letters-main)) var(--letters-side);
  gap: 32px;
  align-items: start;
}
.letters-latest__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ds-color-border);
}
.letters-tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.letters-tabs button {
  height: 32px;
  padding: 0 12px;
  border: 0;
  border-radius: var(--ds-radius-sm);
  background: transparent;
  font: 600 13px/20px var(--ds-font-body);
  color: var(--ds-color-muted);
  cursor: pointer;
}
.letters-tabs button[aria-selected="true"] {
  background: var(--ds-color-surface-inset);
  color: var(--ds-color-text-strong);
}
.letters-sidebar {
  position: sticky;
  top: 112px;
}
.letters-solo {
  max-width: var(--letters-measure);
  margin: 0 auto;
}
.letters-sidebar .letter-signup,
.letters-solo .letter-signup { margin: 0; }

/* ── Shared list (latest, related): 19/26 title, 15/20 dek, 160x107 thumb ─── */
.letters-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.letters-list__item {
  border-bottom: 1px solid var(--ds-color-border);
}
.letters-list__link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 160px;
  gap: 24px;
  align-items: start;
  padding: 20px 0;
  text-decoration: none;
  color: inherit;
}
.letters-list__text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.letters-list__title {
  font-size: 19px;
  line-height: 26px;
  font-weight: 700;
  color: var(--ds-color-text-strong);
}
.letters-list__link:hover .letters-list__title {
  text-decoration: underline;
  text-underline-offset: 3px;
}
.letters-list__sub {
  font-size: 15px;
  line-height: 20px;
  color: var(--ds-color-muted);
}
.letters-list__meta { margin-top: 4px; }
.letters-list__thumb {
  width: 160px;
  height: 107px;
  object-fit: cover;
}

/* ── Post: header ─────────────────────────────────────────────────────────── */
.letter__article,
.letters-related {
  max-width: var(--letters-measure);
  margin: 0 auto;
}
.letter__header {
  padding-top: 0;
}
#page-container .letter__title {
  margin: 0;
  font-size: 44px !important;
  line-height: 1.02 !important;
}
#page-container .letter__subtitle {
  margin: 12px 0 0;
  font-size: 18px;
  line-height: 24px;
  font-weight: 400;
  color: var(--ds-color-muted);
}
.letter__byline {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
}
.letter__byline p {
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: var(--ds-font-mono);
  font-size: 11px;
  line-height: 20px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.letter__byline a {
  color: var(--ds-color-text-strong);
  text-decoration: none;
}
.letter__byline a:hover { text-decoration: underline; }
.letter__byline time { color: var(--ds-color-faint); }
.letter__avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  object-position: 50% 20%;
}
.letter__avatar--lg { width: 56px; height: 56px; }
.letter__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 40px;
  margin-top: 16px;
  border-top: 1px solid var(--ds-color-border);
  border-bottom: 1px solid var(--ds-color-border);
  font-size: 13px;
  color: var(--ds-color-faint);
}
.letter__bar a {
  color: var(--ds-color-muted);
  text-decoration: none;
}
.letter__bar a:hover { color: var(--ds-color-text-strong); }
.letter__share {
  height: 28px;
  padding: 0 12px;
  border: 1px solid var(--ds-color-border);
  border-radius: var(--ds-radius-pill);
  background: transparent;
  font: 500 13px var(--ds-font-body);
  color: var(--ds-color-text-strong);
  cursor: pointer;
}
.letter__share:hover { background: var(--ds-color-surface-raised); }
.letter__cover {
  width: 100%;
  height: auto;
  margin-top: 24px;
  border-radius: var(--ds-radius-md);
}

/* ── Post: in-this-letter ─────────────────────────────────────────────────── */
.letter-toc {
  margin: 24px 0 0;
  padding: 16px 20px;
  background: var(--ds-color-surface-raised);
  border-radius: var(--ds-radius-md);
}
.letter-toc__label {
  margin: 0 0 6px;
  font-family: var(--ds-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ds-color-faint);
}
.letter-toc ol {
  margin: 0;
  padding-left: 1.2em;
}
.letter-toc li { margin: 2px 0; font-size: 15px; line-height: 24px; }
.letter-toc a { color: var(--ds-color-text); text-decoration: none; }
.letter-toc a:hover { text-decoration: underline; }

/* ── Post: body (19px / 30.4px, 20px paragraph gap) ───────────────────────── */
.letter__body {
  padding-top: 32px;
}
#page-container .letter__body p,
#page-container .letter__body li {
  font-size: 19px;
  line-height: 1.6;
  font-weight: 400;
  color: var(--ds-color-text);
}
.letter__body p { margin: 0 0 20px; }
.letter__body ul,
.letter__body ol { margin: 0 0 20px; padding-left: 32px; }
.letter__body li { margin: 8px 0 0; }
.letter__body li:first-child { margin-top: 0; }
.letter__body strong { color: var(--ds-color-text-strong); font-weight: 700; }
.letter__body a {
  color: var(--ds-color-text-strong);
  text-decoration: underline;
  text-decoration-color: var(--letters-gold);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
#page-container .letter__body h2 {
  margin: 40px 0 16px !important;
  font-size: 34px !important;
  line-height: 1.05 !important;
  scroll-margin-top: 112px;
}
#page-container .letter__body h3 {
  margin: 32px 0 12px !important;
  font-size: 26px !important;
  line-height: 1.1 !important;
  scroll-margin-top: 112px;
}
.letter__body blockquote {
  margin: 20px 0;
  padding: 0 0 0 20px;
  border-left: 3px solid var(--letters-gold);
}
.letter__body blockquote p { color: var(--ds-color-text-strong) !important; }
.letter__body hr {
  border: 0;
  border-top: 1px solid var(--ds-color-border);
  margin: 40px 0;
}
.letter__body code {
  font-family: var(--ds-font-mono);
  font-size: 0.85em;
  background: var(--ds-color-surface-inset);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
.letter__body pre {
  margin: 24px 0;
  padding: 20px 22px;
  background: var(--ds-color-dark);
  color: #f4f4f5;
  border-radius: var(--ds-radius-md);
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
}
.letter__body pre code { background: none; padding: 0; color: inherit; font-size: inherit; }
.letter-table {
  margin: 24px 0;
  overflow-x: auto;
  border: 1px solid var(--ds-color-border);
  border-radius: var(--ds-radius-md);
  background: var(--ds-color-surface);
}
.letter__body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.45;
}
.letter__body th,
.letter__body td {
  text-align: left;
  vertical-align: top;
  padding: 12px 14px;
  border-bottom: 1px solid var(--ds-color-border);
}
.letter__body th {
  font-family: var(--ds-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ds-color-faint);
  font-weight: 500;
  background: var(--ds-color-surface-raised);
}
.letter__body tr:last-child td { border-bottom: 0; }

/* ── Signup + CTA blocks ──────────────────────────────────────────────────── */
.letter-signup,
.letter-cta {
  margin: 40px 0;
  padding: 28px;
  border-radius: var(--ds-radius-lg);
}
.letter-signup {
  background: var(--ds-color-surface);
  border: 1px solid var(--ds-color-border);
}
.letter-cta {
  background: var(--ds-color-dark);
  color: var(--ds-color-on-dark);
}
#page-container .letter-signup__title,
#page-container .letter-cta__title {
  margin: 4px 0 8px;
  font-family: var(--ds-font-display);
  font-weight: var(--ds-font-weight-heading, 700);
  font-size: 28px !important;
  line-height: 1.02 !important;
  text-transform: uppercase;
}
#page-container .letter-signup__title { color: var(--ds-color-text-strong) !important; }
#page-container .letter-cta__title { color: var(--ds-color-on-dark) !important; }
/* Parent class keeps these above `.letter__body p` when the blocks sit inside the article */
#page-container .letter-signup .letter-signup__body,
#page-container .letter-cta .letter-cta__body {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 20px;
}
#page-container .letter-signup .letter-signup__body { color: var(--ds-color-muted); }
#page-container .letter-cta .letter-cta__body { color: var(--ds-color-on-dark-muted); }
.letter-signup__form {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.letter-signup__input {
  flex: 1 1 180px;
  min-width: 0;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--ds-color-border);
  border-radius: var(--ds-radius-sm);
  background: var(--ds-color-page);
  font: 400 15px var(--ds-font-body);
  color: var(--ds-color-text);
}
.letter-signup__input:focus {
  outline: 2px solid var(--ds-color-text-strong);
  outline-offset: 1px;
}
.letter-signup__btn,
.letter-cta__btn {
  height: 44px;
  padding: 0 18px;
  border: 0;
  border-radius: var(--ds-radius-sm);
  font: 600 15px var(--ds-font-body);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  text-decoration: none !important;
}
.letter-signup__btn {
  background: var(--ds-color-dark);
  color: var(--ds-color-on-dark);
}
.letter-signup__btn:disabled { opacity: 0.6; cursor: default; }
.letter-cta__btn {
  background: #ffffff;
  color: #000000 !important;
  border-radius: var(--ds-radius-pill);
}
.letter-signup__error {
  flex-basis: 100%;
  margin: 0;
  font-size: 14px;
  color: var(--ds-color-danger);
}
.letter-signup__error:empty { display: none; }
.letters-sidebar .letter-signup { padding: 24px; }
.letters-sidebar #page-container .letter-signup__title,
#page-container .letters-sidebar .letter-signup__title { font-size: 24px !important; }

/* Visually hidden, still read by screen readers (Divi's version isn't loaded here) */
.letters-page .screen-reader-text {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Author + related ─────────────────────────────────────────────────────── */
.letter__author {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--ds-color-border);
}
.letter__author-name {
  margin: 0 0 4px;
  font-weight: 700;
  font-size: 15px;
  color: var(--ds-color-text-strong);
}
.letter__author-bio {
  margin: 0;
  font-size: 15px;
  line-height: 20px;
  color: var(--ds-color-muted);
}
.letters-related { margin-top: 64px; }
.letters-related .letters-label {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ds-color-border);
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
  .letters-popular__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 32px; }
}

@media (max-width: 980px) {
  .letters,
  .letter { padding-top: 120px; }
  .letters-columns { grid-template-columns: minmax(0, 1fr); max-width: var(--letters-main); gap: 48px; }
  .letters-sidebar { position: static; }
}

@media (max-width: 720px) {
  .letters,
  .letter { padding: 112px 16px 72px; }
  #page-container .letters__title { font-size: 34px !important; }
  .letters-feature { height: 360px; }
  /* With a cover: drawing on top, text below it, nothing overlapping */
  .letters-feature:has(img.letters-feature__art) { height: auto; }
  img.letters-feature__art {
    position: static;
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 3 / 2;
    -webkit-mask-image: none;
            mask-image: none;
  }
  .letters-feature:has(img.letters-feature__art) .letters-feature__text {
    position: static;
    width: auto;
    padding: 0 24px 28px;
  }
  .letters-feature__text { left: 24px; bottom: 24px; width: calc(100% - 48px); }
  .letters-feature__title { font-size: 32px; }
  .letters-popular__grid { grid-template-columns: minmax(0, 1fr); }
  .letters-list__link { grid-template-columns: minmax(0, 1fr) 96px; gap: 16px; padding: 20px 0; }
  .letters-list__thumb { width: 96px; height: 64px; }
  .letters-list__title { font-size: 17px; line-height: 24px; }
  #page-container .letter__title { font-size: 36px !important; }
  #page-container .letter__subtitle { font-size: 17px; }
  #page-container .letter__body p,
  #page-container .letter__body li { font-size: 18px; }
  #page-container .letter__body h2 { font-size: 30px !important; }
  .letter__body pre { white-space: pre-wrap; word-break: break-word; font-size: 13px; }
  .letter-signup,
  .letter-cta { padding: 22px; }
}