/* ==========================================================================
   video-to-blog — shared stylesheet (bundled template)
   Editorial, type-driven, Stripe-Press-meets-arXiv. Drop in verbatim; the
   single accent color (--accent / --accent-soft / --accent-deep) is the main
   per-conference dial to retune. Everything else works as-is.
   ========================================================================== */

:root {
  /* Palette: warm paper, deep ink, single accent */
  --bg: #fbf8f3;
  --bg-elev: #ffffff;
  --ink: #1a1a1a;
  --ink-soft: #2b2b2b;
  --ink-mute: #5a5a5a;
  --ink-faint: #8a8a8a;
  --rule: #e6e2d8;
  --rule-strong: #c9c3b3;
  --accent: #b1553a;            /* burnt sienna */
  --accent-soft: #e9d8cf;
  --accent-deep: #8a3d28;
  --highlight: #fff5b8;

  /* Typography */
  --font-serif: "Source Serif 4", "Source Serif Pro", "Iowan Old Style", "Apple Garamond", Garamond, "Palatino", "Georgia", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Menlo, Consolas, monospace;

  --measure: 68ch;
  --radius: 2px;
  --radius-lg: 6px;
  --shadow-soft: 0 1px 0 rgba(26,26,26,0.04), 0 10px 30px -18px rgba(26,26,26,0.2);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121110;
    --bg-elev: #1a1917;
    --ink: #ece7dc;
    --ink-soft: #d8d2c5;
    --ink-mute: #a39d91;
    --ink-faint: #6e6a60;
    --rule: #2a2824;
    --rule-strong: #3a3732;
    --accent: #d98062;
    --accent-soft: #3a2a22;
    --accent-deep: #f0a184;
    --highlight: #594f1a;
    --shadow-soft: 0 1px 0 rgba(0,0,0,0.2), 0 10px 30px -18px rgba(0,0,0,0.6);
  }
}

/* Reset-ish */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.65;
  font-feature-settings: "kern" 1, "liga" 1, "onum" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 100% 1px;
  transition: background-size .18s ease, color .18s ease;
}
a:hover { color: var(--accent-deep); background-size: 100% 2px; }

/* ==========================================================================
   Top navigation (shared)
   ========================================================================== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  background: color-mix(in oklab, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--rule);
}
.site-nav__inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 0.02em;
}
.site-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 600;
  background: none;
}
.site-nav__brand:hover { color: var(--accent-deep); background: none; }
.site-nav__mark {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--accent) 0%, var(--accent-deep) 70%);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.12);
}
.site-nav__links { display: flex; gap: 22px; }
.site-nav__links a {
  color: var(--ink-mute);
  background: none;
}
.site-nav__links a:hover { color: var(--accent-deep); background: none; }

/* ==========================================================================
   Article layout
   ========================================================================== */
.article {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 56px 28px 120px;
}

.article__eyebrow {
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 22px;
}
.article__eyebrow .dot {
  display: inline-block; margin: 0 8px; color: var(--rule-strong);
}
.article__eyebrow .num {
  color: var(--accent);
  font-weight: 600;
}

.article__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2.1rem, 4.2vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.012em;
  margin: 0 0 20px;
  color: var(--ink);
  text-wrap: balance;
}

.article__dek {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--ink-mute);
  font-size: 1.15rem;
  line-height: 1.55;
  margin: 0 0 36px;
  text-wrap: pretty;
}

.article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 28px;
  align-items: baseline;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-mute);
  padding: 16px 0 24px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 44px;
}
.article__meta strong {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* Drop cap */
.article__body > p:first-of-type::first-letter {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 3.6em;
  line-height: 0.88;
  float: left;
  padding: 6px 10px 0 0;
  color: var(--accent);
}

.article__body p,
.article__body ul,
.article__body ol,
.article__body blockquote {
  margin: 0 0 1.25em;
}
.article__body ul, .article__body ol { padding-left: 1.4em; }
.article__body li { margin: 0.35em 0; }
.article__body li::marker { color: var(--accent); }

.article__body h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.55rem;
  line-height: 1.25;
  letter-spacing: -0.008em;
  margin: 2.4em 0 0.7em;
  color: var(--ink);
  scroll-margin-top: 90px;
  position: relative;
}
.article__body h2::before {
  content: "";
  display: block;
  width: 48px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 14px;
}

.article__body h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-style: italic;
  font-size: 1.22rem;
  margin: 1.8em 0 0.6em;
  color: var(--ink-soft);
}

.article__body blockquote {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 22px;
  color: var(--ink-soft);
  font-style: italic;
}

.article__body hr {
  border: 0;
  height: 1px;
  background: var(--rule);
  margin: 3em auto;
  width: 40%;
}

.article__body strong { color: var(--ink); font-weight: 600; }
.article__body em { font-style: italic; }

/* Timestamps inline, like [02:17:27] */
.ts {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78em;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  padding: 1px 6px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  vertical-align: baseline;
  white-space: nowrap;
  background: var(--bg-elev);
}

/* Inline code */
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--accent-soft);
  color: var(--accent-deep);
  padding: 1px 6px;
  border-radius: 3px;
  word-break: break-word;
}

/* Display equations: plain, centered, matching LaTeX \[ \] spacing (~12pt). */
.math-block {
  display: block;
  margin: 0.75em auto;
  padding: 0;
  overflow-x: auto;
  overflow-y: hidden;
  text-align: center;
  font-size: 1em;
  line-height: 1.3;
  color: var(--ink);
}
.math-block .label {
  display: block;
  font-family: var(--font-sans);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--ink-faint);
  margin-bottom: 6px;
  text-align: center;
}
/* Optional tag number on the right, à la \tag{1} */
.math-block .eq-num {
  float: right;
  font-family: var(--font-serif);
  font-size: 0.9em;
  color: var(--ink-faint);
  padding-top: 0.4em;
}

/* MathJax tweaks — LaTeX-like \[ \] spacing */
mjx-container[jax="CHTML"][display="true"] {
  margin: 0.6em 0 !important;
  padding: 0;
  overflow-x: auto;
  overflow-y: hidden;
}
mjx-container { color: var(--ink) !important; }

/* ==========================================================================
   Figures (slide keyframes, diagrams)
   ========================================================================== */
.figure {
  margin: 2.2em -40px;
  padding: 0;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}
@media (max-width: 780px) {
  .figure { margin: 2em 0; }
}
.figure img {
  display: block;
  width: 100%;
  height: auto;
  background: #000;
}
.figure figcaption {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-mute);
  padding: 12px 18px;
  border-top: 1px solid var(--rule);
  background: var(--bg);
  line-height: 1.55;
}
.figure figcaption strong {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.01em;
  display: inline-block;
  margin-right: 6px;
}
.figure figcaption .fig-label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-right: 10px;
}

/* Row of figures (e.g. two slides side by side) */
.figure-row {
  margin: 2.2em -40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
@media (max-width: 780px) {
  .figure-row { margin: 2em 0; grid-template-columns: 1fr; }
}
.figure-row .figure {
  margin: 0;
}

/* Pull-quote */
.pullquote {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  line-height: 1.3;
  font-style: italic;
  color: var(--ink);
  border: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 28px 0;
  margin: 2em 0;
  text-align: center;
  text-wrap: balance;
}

/* Callout / aside */
.callout {
  margin: 1.8em 0;
  padding: 18px 22px;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  font-size: 0.96em;
  color: var(--ink-soft);
}
.callout strong { color: var(--accent-deep); }

/* Article footer / nav between posts */
.article-footer {
  max-width: var(--measure);
  margin: 80px auto 0;
  padding: 28px 28px 0;
  border-top: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.article-footer a { color: var(--ink); background: none; }
.article-footer a:hover { color: var(--accent-deep); }
.article-footer .prev::before { content: "← "; color: var(--accent); }
.article-footer .next { text-align: right; }
.article-footer .next::after { content: " →"; color: var(--accent); }
.article-footer small {
  display: block;
  color: var(--ink-faint);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

/* ==========================================================================
   Landing page
   ========================================================================== */
.landing { max-width: 1180px; margin: 0 auto; padding: 0 28px; }

.hero {
  padding: 88px 0 72px;
  border-bottom: 1px solid var(--rule);
}
.hero__eyebrow {
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 28px;
  display: flex; gap: 16px; align-items: center;
}
.hero__eyebrow .pip {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}
.hero__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(2.4rem, 5.8vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.018em;
  margin: 0 0 28px;
  max-width: 22ch;
  text-wrap: balance;
}
.hero__title em {
  font-style: italic;
  color: var(--accent);
}
.hero__lede {
  max-width: 62ch;
  font-size: 1.22rem;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 0 0 34px;
  text-wrap: pretty;
}
.hero__meta {
  display: flex; flex-wrap: wrap; gap: 18px 36px;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-mute);
}
.hero__meta dt {
  display: inline;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 11px;
  margin-right: 6px;
}
.hero__meta dd { display: inline; margin: 0; color: var(--ink); }
.hero__meta > div { min-width: 0; }

/* Section */
.section {
  padding: 72px 0 40px;
}
.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 18px;
}
.section__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.8rem;
  margin: 0;
  letter-spacing: -0.01em;
}
.section__count {
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* Card grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px 26px;
  background: var(--bg);
  color: var(--ink);
  background-image: none;
  transition: background .2s ease, transform .2s ease;
  min-height: 280px;
  position: relative;
}
.card:hover {
  background: var(--bg-elev);
}
.card__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.card__kind {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.card__num + .card__kind { margin-left: auto; }
.card__head { display: flex; align-items: center; gap: 10px; }
.card__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.35rem;
  line-height: 1.22;
  letter-spacing: -0.008em;
  margin: 0;
  text-wrap: balance;
  color: var(--ink);
}
.card__speaker {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink-mute);
}
.card__speaker strong {
  color: var(--ink);
  font-weight: 600;
}
.card__excerpt {
  font-size: 0.98rem;
  color: var(--ink-soft);
  line-height: 1.55;
  margin: 0;
}
.card__cta {
  margin-top: auto;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.02em;
}
.card__cta::after {
  content: "→";
  transition: transform .2s ease;
}
.card:hover .card__cta::after { transform: translateX(4px); }

/* Panel cards differentiation */
.card--panel::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  opacity: 0.6;
}

/* Themes / pillars row */
.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
  margin-top: 24px;
}
.pillar {
  padding-top: 18px;
  border-top: 1px solid var(--rule-strong);
}
.pillar__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.08em;
}
.pillar h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.1rem;
  margin: 6px 0 10px;
  line-height: 1.3;
}
.pillar p {
  font-size: 0.95rem;
  color: var(--ink-mute);
  margin: 0;
  line-height: 1.55;
}

/* Footer */
.site-footer {
  margin-top: 80px;
  padding: 40px 0 60px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.site-footer a { color: var(--ink-mute); background: none; }
.site-footer a:hover { color: var(--accent-deep); }

/* Responsive */
@media (max-width: 640px) {
  body { font-size: 17px; }
  .article { padding: 40px 20px 80px; }
  .site-nav__inner { padding: 12px 20px; }
  .hero { padding: 60px 0 48px; }
  .article__body > p:first-of-type::first-letter { font-size: 3em; }
  .article-footer { grid-template-columns: 1fr; }
  .article-footer .next { text-align: left; }
}