:root {
  --page: oklch(0.94 0.008 85);
  --card: oklch(0.985 0.006 85);
  --hover: oklch(0.965 0.008 85);
  --ink: #1c1a17;
  --ink-62: rgba(28, 26, 23, 0.62);
  --ink-45: rgba(28, 26, 23, 0.45);
  --ink-42: rgba(28, 26, 23, 0.42);
  --ink-40: rgba(28, 26, 23, 0.4);
  --ink-35: rgba(28, 26, 23, 0.35);
  --ink-32: rgba(28, 26, 23, 0.32);
  --rule: rgba(28, 26, 23, 0.1);
  --rule-soft: rgba(28, 26, 23, 0.08);
  --rule-strong: rgba(28, 26, 23, 0.12);
  --terracotta: oklch(0.55 0.1 42);
  --new-text: oklch(0.46 0.13 42);
  --new-fill: oklch(0.94 0.035 42);
  --new-border: oklch(0.55 0.1 42 / 0.35);
  --teal: oklch(0.52 0.09 235);
  --teal-hover: oklch(0.44 0.1 235);
  --serif: "Spectral", Georgia, "Times New Roman", serif;
  --sans: "Public Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --z-skip: 30;
  --z-topbar: 5;
  --z-rail: 2;
}

* { box-sizing: border-box; }

html {
  background: var(--page);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  color: var(--ink);
  background: var(--page);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

input { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

::selection { background: var(--new-fill); }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: var(--z-skip);
  padding: 0.55rem 0.8rem;
  background: var(--ink);
  color: var(--card);
  font-size: 0.9rem;
  text-decoration: none;
}

.skip-link:focus { top: 1rem; }

.sheet {
  width: 100%;
  max-width: 820px;
  min-height: 100dvh;
  margin: 0 auto;
  background: var(--card);
  border-left: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  box-shadow:
    0 1px 3px rgba(28, 26, 23, 0.07),
    0 12px 32px -18px rgba(28, 26, 23, 0.25);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-topbar);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 41px;
  padding: 12px 22px;
  background: var(--card);
  border-bottom: 1px solid var(--rule);
}

.wordmark,
.result-count {
  margin: 0;
}

.wordmark {
  font: 500 10.5px/1 var(--mono);
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-45);
}

.result-count {
  font: 400 11px/1 var(--sans);
  color: var(--ink-40);
}

.archive-head {
  padding: 44px 44px 24px;
}

.eyebrow {
  margin: 0 0 16px;
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--terracotta);
}

h1 {
  margin: 0 0 28px;
  color: var(--ink);
  font: 400 46px/1.06 var(--serif);
  letter-spacing: -0.016em;
  text-wrap: balance;
}

.archive-head::after {
  content: "";
  display: block;
  border-bottom: 1px solid var(--rule-strong);
}

.search-block {
  padding: 18px 44px 8px;
}

.search-block label {
  display: block;
  margin-bottom: 8px;
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--terracotta);
}

#concept-search {
  width: 100%;
  padding: 8px 0 10px;
  border: 0;
  border-bottom: 1px solid var(--rule-strong);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font: 400 19px/1.3 var(--serif);
  letter-spacing: -0.008em;
  appearance: none;
  -webkit-appearance: none;
}

#concept-search::-webkit-search-decoration,
#concept-search::-webkit-search-cancel-button {
  appearance: none;
  -webkit-appearance: none;
}

#concept-search::placeholder {
  color: var(--ink-62);
}

.archive {
  padding: 0 44px 60px;
}

body:has(#archive-pager:not(:empty)) .archive {
  padding-bottom: 28px;
}

.month-group {
  display: grid;
  grid-template-columns: 126px 1fr;
  gap: 26px;
  align-items: start;
  padding: 26px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.month-group[hidden] { display: none; }

.month-rail {
  position: sticky;
  top: 74px;
  padding-top: 2px;
}

.month-name, .month-year {
  margin: 0;
  color: var(--ink);
  font: 500 12px/1.25 var(--sans);
}

.month-count {
  margin: 3px 0 0;
  font: 400 11px/1.4 var(--mono);
  color: var(--ink-42);
}

.month-count {
  margin-top: 8px;
  color: var(--ink-35);
}

.month-entries {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: -15px;
}

.concept-entry {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 6px;
  align-items: start;
  min-height: 44px;
  margin: 0 -12px;
  padding: 14px 12px 15px;
  border-radius: 8px;
  color: inherit;
  text-decoration: none;
  transition: background 0.18s ease;
}

.concept-entry[hidden] { display: none; }

.concept-entry:hover,
.concept-entry:focus-visible {
  background: var(--hover);
}

.concept-num {
  padding-top: 2px;
  color: var(--terracotta);
  font: 500 11px/1.6 var(--mono);
}

.concept-body {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.concept-title-line {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
}

.concept-entry h3 {
  margin: 0;
  color: var(--ink);
  font: 400 19px/1.3 var(--serif);
  letter-spacing: -0.008em;
  text-wrap: pretty;
}

.new-tag {
  font: 600 8.5px/1 var(--mono);
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--new-text);
  background: var(--new-fill);
  border: 1px solid var(--new-border);
  border-radius: 3px;
  padding: 3px 5px 2.5px;
}

.new-tag[hidden] { display: none; }

.concept-blurb {
  margin: 0;
  color: var(--ink-62);
  font: 400 14.5px/1.5 var(--serif);
  text-wrap: pretty;
}

.concept-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-top: 2px;
}

.concept-field {
  font: 400 10.5px/1 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-40);
  white-space: nowrap;
}

.concept-date,
.concept-read {
  font: 400 10.5px/1 var(--mono);
  color: var(--ink-32);
  white-space: nowrap;
}

.empty-state,
.empty-catalog {
  margin: 0;
  padding: 36px 0;
  color: var(--ink-62);
  font: 400 16px/1.6 var(--serif);
}

.empty-state {
  padding: 12px 44px 60px;
}

#archive-pager:empty,
#archive-pager[hidden] {
  display: none;
}

.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 0 44px;
  padding: 18px 0 56px;
  border-top: 1px solid var(--rule-strong);
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pagination-pages {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2px;
}

.pagination-page,
.pagination-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  min-height: 32px;
  padding: 0 8px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--ink-45);
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  text-decoration: none;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.pagination-page.is-current {
  color: var(--terracotta);
  cursor: default;
}

.pagination-step.is-disabled {
  color: var(--ink-35);
  cursor: default;
  opacity: 0.55;
}

.pagination-ellipsis {
  padding: 0 6px;
  color: var(--ink-35);
}

.pagination-page:hover:not(.is-current),
.pagination-step:hover:not(.is-disabled) {
  color: var(--ink);
}

.missing-copy {
  padding: 0 44px 60px;
}

.missing-copy p {
  margin: 0;
  max-width: 34em;
  color: var(--ink-62);
  font: 400 20px/1.5 var(--serif);
  text-wrap: pretty;
}

.missing-copy a {
  color: var(--teal);
  text-decoration: none;
}

.missing-copy a:hover {
  color: var(--teal-hover);
}

@media (max-width: 639px) {
  .archive-head { padding: 28px 22px 20px; }

  h1 {
    margin-bottom: 20px;
    font-size: 30px;
    line-height: 1.08;
  }

  .search-block,
  .archive,
  .empty-state,
  .missing-copy,
  .pagination {
    padding-left: 22px;
    padding-right: 22px;
  }

  .pagination {
    margin: 0;
  }

  .archive { padding-bottom: 48px; }

  .month-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 20px 0;
  }

  .month-rail {
    display: flex;
    align-items: baseline;
    gap: 8px;
    top: 41px;
    padding: 6px 0;
    background: var(--card);
    z-index: var(--z-rail);
  }

  .month-year,
  .month-count { margin: 0; }

  .concept-entry {
    grid-template-columns: 32px 1fr;
    margin: 0 -10px;
    padding: 12px 10px 13px;
  }

  .concept-entry h3 {
    font-size: 18px;
    line-height: 1.3;
  }

  .missing-copy p { font-size: 17px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}