:root {
  --paper: #fbfaf6;
  --ink: #181713;
  --ink-soft: #3f3b33;
  --muted: #726c60;
  --faint: #9a9385;
  --line: #e5dfd3;
  --line-strong: #d5ccbb;
  --panel: #f2eee6;
  --accent: #a65325;
  --accent-soft: rgba(166, 83, 37, 0.12);
  --good: #2f7d59;
  --radius: 8px;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: Georgia, "Times New Roman", serif;
}

html[data-theme="dark"] {
  --paper: #151410;
  --ink: #eee8dc;
  --ink-soft: #d4ccbd;
  --muted: #a39a89;
  --faint: #776f60;
  --line: #302d25;
  --line-strong: #433d32;
  --panel: #201e18;
  --accent: #df8247;
  --accent-soft: rgba(223, 130, 71, 0.16);
  --good: #72c29a;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 3px solid var(--accent-soft);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 20;
  background: var(--ink);
  color: var(--paper);
  padding: 0.55rem 0.8rem;
}

.skip-link:focus {
  left: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  min-height: 60px;
  gap: 1rem;
  padding: 0 3rem;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(14px) saturate(1.25);
}

.wordmark {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.14rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.tabs {
  display: flex;
  gap: 0.25rem;
  margin-inline: auto;
}

.tab,
.icon-button,
.chip,
.entry-report,
.source-link,
.search-row button {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.2;
  padding: 0.48rem 0.7rem;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.tab:hover,
.icon-button:hover,
.chip:hover,
.entry-report:hover,
.source-link:hover,
.search-row button:hover {
  background: var(--panel);
  border-color: var(--line-strong);
  color: var(--ink);
}

.tab.is-active,
.tab[aria-selected="true"],
.chip[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.header-actions {
  display: flex;
  gap: 0.35rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(240px, 320px) minmax(0, 900px);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
  padding: 3.5rem 3rem;
}

.rail {
  position: sticky;
  top: 92px;
  align-self: start;
}

.content {
  min-width: 0;
}

.eyebrow,
.intro,
.active-summary,
.entry-meta,
.entry-summary,
.control-help,
.source-class,
.model-meta {
  color: var(--muted);
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: 0.82rem;
}

h1 {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.05;
}

.intro {
  margin: 0 0 2rem;
  max-width: 38ch;
}

.control-group {
  margin-top: 1.4rem;
}

.control-group h2,
.control-group label {
  display: block;
  margin: 0 0 0.55rem;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.control-help {
  margin: 0.45rem 0 0;
  font-size: 0.82rem;
}

#importance-range {
  width: 100%;
  accent-color: var(--accent);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.search-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.search-row input {
  flex: 1;
  min-width: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  padding: 0.7rem 0.8rem;
}

.active-summary {
  min-height: 1.4rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.timeline,
.models {
  border-top: 1px solid var(--line-strong);
}

.month,
.model-group {
  padding: 1.2rem 0 0;
}

.month h2,
.model-group h2,
.method h2 {
  margin: 0 0 0.9rem;
  font-family: var(--serif);
  font-size: 1.55rem;
  line-height: 1.15;
}

.entry {
  border-top: 1px solid var(--line);
  padding: 1.15rem 0;
}

.entry:first-of-type {
  border-top: 0;
}

.entry-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin-bottom: 0.35rem;
  font-size: 0.82rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  padding: 0.16rem 0.45rem;
}

.badge-primary {
  border-color: color-mix(in srgb, var(--good) 45%, var(--line));
  color: var(--good);
}

.entry-title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.28rem, 2.2vw, 1.65rem);
  line-height: 1.18;
}

.entry-title a {
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.entry-summary {
  max-width: 72ch;
  margin: 0.55rem 0;
}

.source-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin-top: 0.8rem;
}

.source-link,
.entry-report {
  display: inline-flex;
  gap: 0.35rem;
  align-items: center;
}

.source-class {
  font-size: 0.76rem;
  text-transform: capitalize;
}

.entry-report {
  color: var(--accent);
}

.method {
  border-top: 1px solid var(--line-strong);
  padding-top: 1.2rem;
}

.method-section {
  border-top: 1px solid var(--line);
  padding: 1rem 0;
}

.method-section:first-of-type {
  border-top: 0;
}

.method dt {
  font-weight: 700;
}

.method dd {
  margin: 0 0 0.8rem;
  color: var(--muted);
}

.empty-state {
  border-top: 1px solid var(--line-strong);
  color: var(--muted);
  padding: 2rem 0;
}

@media (max-width: 820px) {
  .site-header {
    flex-wrap: wrap;
    padding: 0.75rem 1rem;
  }

  .tabs {
    order: 3;
    width: 100%;
    margin-inline: 0;
    overflow-x: auto;
  }

  .header-actions {
    margin-left: auto;
  }

  .layout {
    display: block;
    padding: 1.6rem 1rem 3rem;
  }

  .rail {
    position: static;
    margin-bottom: 2rem;
  }

  .search-row {
    flex-direction: column;
  }
}