:root {
  /* Editorial palette: warm paper, deep ink, a single brass accent. */
  --paper: #f6f2ea;
  --surface: #fbf8f1;
  --ink: #1b1815;
  --ink-soft: #4a443c;
  --muted: #766f63;
  --accent: #9a5b2e; /* brass / terracotta */
  --accent-soft: #c98a4f;
  --rule: rgba(27, 24, 21, 0.14);
  --rule-soft: rgba(27, 24, 21, 0.08);

  --side-bg: #181613;
  --side-ink: #efe9df;
  --side-muted: #9b9183;
  --side-rule: rgba(239, 233, 223, 0.12);

  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, Georgia,
    Cambria, "Times New Roman", serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  color-scheme: light;
  font-family: var(--serif);
}

* {
  box-sizing: border-box;
}

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

body {
  background: var(--paper);
  color: var(--ink);
  margin: 0;
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

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

/* ---------- Layout ---------- */
.reader {
  display: grid;
  grid-template-columns: minmax(15.5rem, 21rem) minmax(0, 1fr);
  min-height: 100vh;
}

/* ---------- Sidebar index ---------- */
.index {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  background: var(--side-bg);
  color: var(--side-ink);
  padding: clamp(1.5rem, 2.6vw, 2.4rem) clamp(1.5rem, 2.4vw, 2.1rem);
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--side-ink);
}

.brand__mark {
  display: inline-grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid var(--side-rule);
  border-radius: 6px;
  color: var(--accent-soft);
}

.brand__name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.32rem;
  letter-spacing: 0.01em;
}

.index__tagline {
  margin: 0.85rem 0 0;
  font-family: var(--sans);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--side-muted);
  max-width: 22ch;
}

.index__top {
  border-bottom: 1px solid var(--side-rule);
  padding-bottom: 1.4rem;
}

.index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.index-link {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: baseline;
  padding: 0.95rem 0.7rem;
  margin: 0 -0.7rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--side-ink);
  border: 1px solid transparent;
  transition: background-color 0.16s ease, color 0.16s ease;
}

.index-list li + li .index-link {
  position: relative;
}

.index-list li + li .index-link::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0.7rem;
  right: 0.7rem;
  border-top: 1px solid var(--side-rule);
}

.index-link__num {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--side-muted);
  font-variant-numeric: tabular-nums;
  padding-top: 0.15rem;
}

.index-link__title {
  display: block;
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.28;
  font-weight: 500;
}

.index-link__meta {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--side-muted);
  font-variant-numeric: tabular-nums;
}

.index-link:hover {
  background: rgba(239, 233, 223, 0.06);
}

.index-link:hover .index-link__title {
  color: #fff;
}

.index-link.is-active {
  background: rgba(201, 138, 79, 0.12);
}

.index-link.is-active .index-link__num,
.index-link.is-active .index-link__title {
  color: var(--accent-soft);
}

.index-link.is-active::before,
.index-link.is-active + li .index-link::before {
  border-color: transparent;
}

.index-link:focus-visible {
  outline: 2px solid var(--accent-soft);
  outline-offset: 2px;
}

.index__foot {
  margin: auto 0 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--side-rule);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--side-muted);
}

/* ---------- Article column ---------- */
.post {
  background: var(--surface);
  border-left: 1px solid var(--rule);
  padding: clamp(2.4rem, 6vw, 5.5rem) clamp(1.5rem, 6vw, 4rem) 5rem;
}

.post__head {
  max-width: 38rem;
  margin: 0 auto;
  padding-bottom: 2.4rem;
  margin-bottom: 2.8rem;
  border-bottom: 1px solid var(--rule);
}

.post__kicker {
  margin: 0 0 1.4rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.post__title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.3rem, 5.6vw, 3.6rem);
  line-height: 1.06;
  letter-spacing: -0.012em;
  text-wrap: balance;
}

.post__lede {
  margin: 1.5rem 0 0;
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 34rem;
}

.post__byline {
  margin-top: 1.7rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.post__byline-name {
  color: var(--ink-soft);
}

.post__byline-dot {
  color: var(--rule);
}

/* ---------- Reading typography ---------- */
.post__body {
  max-width: 38rem; /* ~66ch at this size */
  margin: 0 auto;
  font-size: clamp(1.12rem, 1.4vw, 1.25rem);
  line-height: 1.72;
  color: var(--ink);
}

.post__body > * {
  margin: 0;
}

.post__body > * + * {
  margin-top: 1.5rem;
}

.post__body p {
  hyphens: auto;
}

.post__body > p:first-child::first-letter {
  float: left;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 3.6em;
  line-height: 0.78;
  padding: 0.05em 0.12em 0 0;
  color: var(--accent);
}

.post__body h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.5rem, 2.6vw, 1.85rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-top: 2.8rem;
}

.post__body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: var(--accent-soft);
}

.post__body a:hover {
  text-decoration-thickness: 2px;
}

.post__body ul {
  padding-left: 0;
  list-style: none;
}

.post__body ul li {
  position: relative;
  padding-left: 1.5rem;
}

.post__body ul li + li {
  margin-top: 0.6rem;
}

.post__body ul li::before {
  content: "";
  position: absolute;
  left: 0.1rem;
  top: 0.72em;
  width: 0.42rem;
  height: 0.42rem;
  border: 1px solid var(--accent);
  transform: rotate(45deg);
}

.post__body blockquote {
  margin: 2.4rem 0;
  padding: 0.3rem 0 0.3rem 1.6rem;
  border-left: 3px solid var(--accent);
}

.post__body blockquote p {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.3rem, 2.6vw, 1.6rem);
  line-height: 1.42;
  color: var(--ink-soft);
}

.post__body code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: rgba(154, 91, 46, 0.1);
  color: var(--accent);
  padding: 0.12em 0.36em;
  border-radius: 4px;
}

.post__body pre {
  margin: 2rem 0;
  background: var(--side-bg);
  color: var(--side-ink);
  border-radius: 10px;
  padding: 1.25rem 1.4rem;
  overflow-x: auto;
  font-size: 0.92rem;
  line-height: 1.6;
  border: 1px solid rgba(0, 0, 0, 0.4);
}

.post__body pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 0.92rem;
}

/* ---------- Pager ---------- */
.pager {
  max-width: 38rem;
  margin: 4rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.pager__link {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--rule);
  border-radius: 10px;
  text-decoration: none;
  background: var(--paper);
  transition: border-color 0.16s ease, transform 0.16s ease;
}

.pager__link--next {
  text-align: right;
  align-items: flex-end;
}

.pager__link--empty {
  border: 1px dashed var(--rule-soft);
  background: none;
}

.pager__dir {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.pager__title {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--ink);
}

a.pager__link:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

a.pager__link:focus-visible,
.brand:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .reader {
    grid-template-columns: 1fr;
  }

  .index {
    position: static;
    height: auto;
    overflow: visible;
    gap: 1.4rem;
    padding: 1.5rem 1.4rem 1.8rem;
  }

  .index__foot {
    display: none;
  }

  .index-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .index-list li {
    flex: 1 1 14rem;
  }

  .index-list li + li .index-link::before {
    display: none;
  }

  .index-link {
    margin: 0;
    border: 1px solid var(--side-rule);
  }

  .post {
    border-left: none;
  }
}

@media (max-width: 520px) {
  .pager {
    grid-template-columns: 1fr;
  }

  .pager__link--next {
    text-align: left;
    align-items: flex-start;
  }

  .post__body > p:first-child::first-letter {
    font-size: 3em;
  }
}

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