/*
  coindesk.cc public design system.

  Direction: light-first editorial research, paper and teal, Source Serif 4
  headlines with IBM Plex Sans body text and IBM Plex Mono figures. Tokens come
  from BUILD_SPEC section 7; structure follows the workspace mockup (masthead,
  lead with a data figure, section bands, article column plus sticky rail).

  Colour never carries meaning alone: up and down values are signed and
  labelled, chart series are also printed as text under the chart.
  Motion is limited to hover, focus and state feedback (MOTION 1).
*/

@font-face {
  font-family: "Source Serif 4";
  src: url("fonts/source-serif-4-latin-var.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Sans";
  src: url("fonts/ibm-plex-sans-latin-var.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/ibm-plex-mono-latin-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/ibm-plex-mono-latin-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("fonts/ibm-plex-mono-latin-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #FBFAF7;
  --surface: #FFFFFF;
  --surface-alt: #F1EFE8;
  --ink: #15171C;
  --ink-muted: #5E6470;
  --accent: #0F6B63;
  --accent-hover: #0B5049;
  --accent-ink: #FFFFFF;
  --highlight: #E8F3F1;
  --rule: #E6E2DA;
  --rule-strong: #CFC9BE;
  --edge: #74797F;
  --up: #1F7A4D;
  --down: #B42318;
  --strip-bg: #15171C;
  --strip-ink: #FBFAF7;
  --strip-muted: #B9BDC5;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 4px;
  --radius-lg: 6px;
}

[data-theme="dark"] {
  --paper: #111315;
  --surface: #191C1F;
  --surface-alt: #1E2226;
  --ink: #ECEAE4;
  --ink-muted: #A6ACB6;
  --accent: #5CC2B5;
  --accent-hover: #86D6CB;
  --accent-ink: #0C1514;
  --highlight: #172D2A;
  --rule: #2A2E34;
  --rule-strong: #3C4149;
  --edge: #6F7681;
  --up: #56C08A;
  --down: #F0857A;
  --strip-bg: #191C1F;
  --strip-ink: #ECEAE4;
  --strip-muted: #A6ACB6;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 1.5rem;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: 0;
  margin: 0;
}

p { margin: 0; }
ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; }
img, svg, table { max-width: 100%; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

a:hover { color: var(--accent-hover); }

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

[hidden] { display: none !important; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.muted { color: var(--ink-muted); }
.value-up { color: var(--up); }
.value-down { color: var(--down); }
.value-neutral { color: var(--ink-muted); }

.wrap {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.wrap.narrow { max-width: 820px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 30;
  padding: 0.75rem 1.1rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  left: 0.75rem;
  top: 0.75rem;
}

.demo-banner {
  padding: 0.5rem 1rem;
  background: var(--strip-bg);
  color: var(--strip-ink);
  font-size: 0.82rem;
  font-weight: 600;
  text-align: center;
}

/* Header */
.site-header {
  position: relative;
  background: var(--paper);
  border-bottom: 1px solid var(--rule-strong);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  padding-block: 0.7rem;
}

.wordmark { display: inline-flex; align-items: center; gap: 0.55rem; text-decoration: none; }
.wordmark img { display: block; width: 30px; height: 30px; }
.wordmark__text {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--ink);
}
.wordmark:hover .wordmark__text { text-decoration: underline; }

.nav-disclosure { order: 2; flex: 0 0 auto; }
.site-nav--desktop { display: none; }
.nav-disclosure > summary { list-style: none; }
.nav-disclosure > summary::-webkit-details-marker { display: none; }
.nav-toggle { display: inline-flex; }

.site-nav { padding-top: 0.5rem; border-top: 1px solid var(--rule); margin-top: 0.5rem; }
.site-nav ul { list-style: none; display: flex; flex-direction: column; }
.site-nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding-right: 1rem;
  color: var(--ink);
  font-size: 0.95rem;
  text-decoration: none;
}
.site-nav a:hover { color: var(--accent); text-decoration: underline; }
.site-nav a[aria-current="page"] { color: var(--accent); font-weight: 600; }
.nav-secondary { margin-top: 0.25rem; padding-top: 0.25rem; border-top: 1px solid var(--rule); }

.header-tools { order: 2; margin-left: auto; display: flex; align-items: center; gap: 0.5rem; }

/* Buttons and controls */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 44px;
  padding: 0.55rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-solid { background: var(--accent); color: var(--accent-ink); padding-inline: 1.3rem; }
.btn-solid:hover { background: var(--accent-hover); color: var(--accent-ink); }
.btn-ghost { border-color: var(--edge); color: var(--ink); }
.btn-ghost:hover { background: var(--surface-alt); color: var(--ink); }
.btn-icon { padding-inline: 0.8rem; }

.glyph { width: 1.1rem; height: 1.1rem; flex: none; }
.glyph-sun { display: none; }
[data-theme="dark"] .glyph-moon { display: none; }
[data-theme="dark"] .glyph-sun { display: inline-block; }

input[type="search"], input[type="number"], select, input[type="text"], input[type="email"] {
  width: 100%;
  min-height: 44px;
  padding: 0.55rem 0.7rem;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  font: inherit;
  font-size: 1rem;
}

/* Breadcrumb */
.breadcrumb { padding-top: 1rem; }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; font-size: 0.85rem; color: var(--ink-muted); }
.breadcrumb li + li::before { content: "/"; padding-inline: 0.5rem; color: var(--ink-muted); }
.breadcrumb a { color: var(--ink-muted); }

/* Masthead and lead */
.masthead { padding-top: clamp(1.25rem, 3vw, 2rem); }
.edition-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
  border-top: 3px solid var(--ink);
  padding-top: 0.6rem;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.kicker { font-size: 0.8125rem; font-weight: 600; color: var(--accent); }

.lead { padding-block: clamp(1.5rem, 4vw, 3rem); }
.lead-grid { display: grid; gap: clamp(2rem, 4vw, 3.5rem); }
.lead-text h1 { font-size: clamp(2.2rem, 5.6vw, 3.6rem); line-height: 1.04; margin-top: 0.5rem; }
.deck { margin-top: 1rem; max-width: 52ch; font-size: clamp(1.1rem, 2.1vw, 1.3rem); line-height: 1.5; color: var(--ink-muted); }
.lead-actions { margin-top: 1.5rem; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.lead-meta { margin-top: 1.2rem; display: flex; flex-wrap: wrap; gap: 0.35rem 1rem; font-size: 0.82rem; color: var(--ink-muted); }

.diagram {
  margin: 0;
  padding: clamp(1rem, 3vw, 1.5rem);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-lg);
}
.diagram-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.35rem 1rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--rule);
}
.diagram-title { font-family: var(--serif); font-size: 1.15rem; font-weight: 600; }
.diagram-sub { font-size: 0.78rem; color: var(--ink-muted); }
.panel-note { margin-top: 1rem; font-size: 0.92rem; color: var(--ink-muted); }
.source-line { margin-top: 1.25rem; font-size: 0.85rem; }

/* Charts */
.chart-figure { margin: 1.25rem 0 0; }
.chart { display: block; width: 100%; height: auto; aspect-ratio: 640 / 220; }
.chart-tick { font-family: var(--mono); font-size: 13px; fill: var(--ink-muted); }
.chart-readout { display: flex; flex-wrap: wrap; gap: 0.35rem 1.1rem; margin-top: 0.6rem; font-size: 0.85rem; color: var(--ink-muted); }
.chart-caption { margin-top: 0.55rem; max-width: 60ch; font-size: 0.8rem; color: var(--ink-muted); }
.bar-list { list-style: none; display: grid; gap: 0.45rem; margin-top: 0.75rem; }
.bar-row { display: grid; grid-template-columns: minmax(5.5rem, 9rem) minmax(0, 1fr) auto; align-items: center; gap: 0.6rem; font-size: 0.86rem; }
.bar-label { color: var(--ink-muted); overflow-wrap: anywhere; }
.bar-track { display: block; height: 12px; background: var(--surface-alt); border: 1px solid var(--rule-strong); border-radius: 2px; overflow: hidden; }
.bar-fill { display: block; height: 100%; background: var(--accent); }
.bar-fill.bar-down { background: var(--down); }
.bar-value { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* Section headings and bands */
.section-head { max-width: 64ch; margin-bottom: clamp(1.1rem, 3vw, 1.75rem); }
.section-head h2 { font-size: clamp(1.5rem, 3.4vw, 2.1rem); }
.section-note { margin-top: 0.5rem; color: var(--ink-muted); }
.section-more { margin-top: 1.25rem; }

.latest { padding-block: clamp(1.75rem, 5vw, 3rem); }
.trackers {
  padding-block: clamp(1.75rem, 5vw, 3rem);
  background: var(--surface-alt);
  border-block: 1px solid var(--rule-strong);
}
.background { padding-block: clamp(1.75rem, 5vw, 3rem); }
.about { padding-block: clamp(1.75rem, 5vw, 3rem); border-top: 1px solid var(--rule-strong); }
.about-grid { display: grid; gap: 1rem; }
.about-text p + p { margin-top: 0.75rem; }

.card-grid { display: grid; gap: clamp(1rem, 2.5vw, 1.75rem); }

.story-card {
  padding: 1.1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-lg);
}
.story-card__meta { display: flex; flex-wrap: wrap; gap: 0.4rem 0.9rem; font-size: 0.78rem; color: var(--ink-muted); }
.story-card h2, .story-card h3 { margin-top: 0.5rem; font-size: clamp(1.1rem, 2.2vw, 1.35rem); }
.story-card h2 a, .story-card h3 a { color: var(--ink); text-decoration: none; }
.story-card h2 a:hover, .story-card h3 a:hover { color: var(--accent); text-decoration: underline; }
.story-card__summary { margin-top: 0.5rem; font-size: 0.94rem; line-height: 1.55; color: var(--ink-muted); }
.story-card__tags { margin-top: 0.7rem; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.tag { font-weight: 600; color: var(--accent); }

.entry-list { list-style: none; }
.entry { padding-block: 1.15rem; border-top: 1px solid var(--rule); }
.entry:last-child { border-bottom: 1px solid var(--rule); }
.entry-meta { display: flex; flex-wrap: wrap; gap: 0.5rem 0.9rem; font-size: 0.78rem; color: var(--ink-muted); }
.entry h3 { margin-top: 0.4rem; font-size: clamp(1.1rem, 2.3vw, 1.35rem); }
.entry h2, .entry-headline { margin-top: 0.4rem; font-size: clamp(1.1rem, 2.3vw, 1.35rem); }
.entry h3 a { color: var(--ink); text-decoration: none; }
.entry h3 a:hover { color: var(--accent); text-decoration: underline; }
.entry h2 a { color: var(--ink); text-decoration: none; }
.entry h2 a:hover { color: var(--accent); text-decoration: underline; }
.entry-text { margin-top: 0.45rem; max-width: 62ch; font-size: 0.94rem; color: var(--ink-muted); }

.bg-grid { list-style: none; display: grid; gap: clamp(1rem, 2.5vw, 2rem); }
.bg-grid h3 { font-size: clamp(1.1rem, 2.2vw, 1.3rem); }
.bg-grid h3 a { color: var(--ink); text-decoration: none; }
.bg-grid h3 a:hover { color: var(--accent); text-decoration: underline; }
.bg-grid p { margin-top: 0.4rem; max-width: 48ch; color: var(--ink-muted); }

.link-list { list-style: none; display: grid; gap: 0.35rem; }
.link-list a { display: inline-flex; align-items: center; min-height: 44px; }

/* Tables: cards under 720px so nothing is squeezed */
.data-table { width: 100%; border-collapse: collapse; font-size: 0.94rem; }
.data-table th, .data-table td { padding: 0.8rem 0.7rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--rule-strong); }
.data-table thead th { padding-top: 0; border-bottom: 2px solid var(--ink); font-size: 0.78rem; font-weight: 600; color: var(--ink-muted); }
.data-table tbody th { font-family: var(--serif); font-weight: 600; font-size: 1.02rem; }
.data-table td:first-of-type, .data-table th:first-child { padding-left: 0; }
.cell-label { display: none; }

@media (max-width: 719px) {
  .data-table { display: block; }
  .data-table thead { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  .data-table tbody, .data-table tr, .data-table th, .data-table td { display: block; }
  .data-table tr { margin-bottom: 0.9rem; padding: 1rem; background: var(--surface); border: 1px solid var(--rule-strong); border-radius: var(--radius-lg); }
  .data-table th, .data-table td { padding: 0; border-bottom: 0; }
  .data-table thead { display: none; }
  .data-table td { margin-top: 0.55rem; }
  .data-table td::before {
    content: attr(data-label);
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--ink-muted);
  }
}

/* Page headers, filters, search */
.page-head { padding-block: clamp(1.5rem, 4vw, 2.5rem) 0; max-width: 72ch; }
.page-head h1 { font-size: clamp(1.9rem, 4.4vw, 2.8rem); }
.page-head__note { margin-top: 0.75rem; color: var(--ink-muted); }
.page-head__meta { margin-top: 0.6rem; font-size: 0.85rem; color: var(--ink-muted); }

.filter-tabs { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.25rem; }
.filter-tabs a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--edge);
  border-radius: 999px;
  color: var(--ink);
  font-size: 0.92rem;
  text-decoration: none;
}
.filter-tabs a[aria-current="page"] { background: var(--highlight); border-color: var(--accent); color: var(--accent); font-weight: 600; }

.filter-bar {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.25rem;
  margin-bottom: 1.5rem;
  padding: 1.1rem;
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-lg);
}
.filter-bar__field label { display: block; margin-bottom: 0.35rem; font-size: 0.78rem; font-weight: 600; color: var(--ink-muted); }
.filter-bar__actions { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }

.search-form { margin-top: 1.25rem; }
.search-form label { display: block; margin-bottom: 0.35rem; font-size: 0.78rem; font-weight: 600; color: var(--ink-muted); }
.search-form__row { display: flex; flex-wrap: wrap; gap: 0.6rem; max-width: 34rem; }
.search-form__row input { flex: 1 1 14rem; }
.search-count { margin-top: 1rem; color: var(--ink-muted); }

/* Article */
.article-shell { padding-bottom: clamp(2rem, 5vw, 3rem); }
.article-grid { display: grid; gap: clamp(2rem, 4vw, 3rem); padding-block: clamp(1.25rem, 3vw, 2rem); }
.article h1 { margin-top: 0.5rem; font-size: clamp(2rem, 4.8vw, 3rem); line-height: 1.06; }
.article-deck { margin-top: 1rem; max-width: 52ch; font-size: clamp(1.05rem, 2.1vw, 1.25rem); line-height: 1.5; color: var(--ink-muted); }
.article-meta { margin-top: 1rem; display: flex; flex-wrap: wrap; gap: 0.35rem 1rem; font-size: 0.85rem; color: var(--ink-muted); }
.article-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; margin-top: 1.1rem; padding-block: 0.8rem; border-block: 1px solid var(--rule); }
.tool-state { font-size: 0.85rem; color: var(--ink-muted); }
.article section { margin-block: clamp(1.6rem, 3.5vw, 2.4rem); }
.article h2 { margin-bottom: 0.65rem; font-size: clamp(1.4rem, 3vw, 1.8rem); scroll-margin-top: 1.5rem; }
.article p { max-width: 68ch; }
.article p + p { margin-top: 0.8rem; }

.short-answer {
  margin-top: 1.5rem;
  padding: clamp(1rem, 3vw, 1.35rem);
  background: var(--highlight);
  border: 1px solid var(--rule-strong);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-lg);
}
.short-answer h2 { font-size: 1.15rem; }
.short-answer p { margin-top: 0.5rem; }

.citation-line { margin-top: 0.35rem !important; display: flex; flex-wrap: wrap; gap: 0.35rem 0.9rem; font-size: 0.75rem; color: var(--ink-muted); }
.item-list { margin-top: 0.6rem; padding-left: 1.1rem; list-style: disc; }
.item-list li { max-width: 66ch; margin-top: 0.4rem; }
.item-date { font-size: 0.8rem; color: var(--ink-muted); }

.faq { display: grid; gap: 0.5rem; }
.faq details { border: 1px solid var(--rule-strong); border-radius: var(--radius); background: var(--surface); }
.faq summary { min-height: 44px; display: flex; align-items: center; padding: 0.6rem 0.9rem; font-weight: 600; cursor: pointer; }
.faq p { padding: 0 0.9rem 0.8rem; color: var(--ink-muted); }

.fact-sheet, .side-card {
  padding: 1.15rem;
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-lg);
}
.fact-sheet + .side-card, .side-card + .side-card, .fact-sheet + .fact-sheet { margin-top: 1rem; }
.fact-sheet__title, .side-title { font-size: 1.1rem; }
.fact-sheet__note { margin-top: 0.4rem; font-size: 0.8rem; color: var(--ink-muted); }
.facts { margin-top: 0.8rem; }
.facts dt { font-size: 0.78rem; font-weight: 600; color: var(--accent); }
.facts dd { margin: 0.15rem 0 0.8rem; font-size: 0.94rem; }
.facts dd:last-child { margin-bottom: 0; }
.facts__date { margin-left: 0.5rem; font-size: 0.8rem; color: var(--ink-muted); }
.facts__badge {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.05rem 0.45rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--accent);
}
.facts__source { display: block; margin-top: 0.2rem; font-size: 0.78rem; }
.facts--data { list-style: none; }
.facts--data li { display: flex; flex-wrap: wrap; gap: 0.4rem 0.75rem; padding-block: 0.45rem; border-top: 1px solid var(--rule); font-size: 0.9rem; }
.facts--data li:first-child { border-top: 0; padding-top: 0; }
.facts__label { flex: 1 1 9rem; color: var(--ink-muted); }

.data-blocks { display: grid; gap: 0.75rem; margin-top: 1rem; }
.data-block { padding: 0.9rem 1rem; background: var(--surface); border: 1px solid var(--rule-strong); border-radius: var(--radius); }
.data-block__label { font-size: 0.78rem; font-weight: 600; color: var(--ink-muted); }
.data-block__value { margin-top: 0.2rem; font-size: 1.35rem; font-weight: 600; }
.data-block__meta { margin-top: 0.3rem; display: flex; flex-wrap: wrap; gap: 0.35rem 0.9rem; font-size: 0.78rem; color: var(--ink-muted); }

.price-chips { list-style: none; margin-top: 0.7rem; display: grid; gap: 0.5rem; }
.price-chips li { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.5rem 0.75rem; font-size: 0.9rem; }
.price-chips__symbol { font-weight: 600; }
.chip-list { list-style: none; margin-top: 0.7rem; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0.25rem 0.7rem;
  background: var(--highlight);
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  color: var(--accent);
  font-size: 0.85rem;
  text-decoration: none;
}
.chip--plain { background: var(--surface-alt); color: var(--ink-muted); font-family: var(--mono); }

.timeline { list-style: none; position: relative; margin-top: 0.8rem; }
.timeline::before { content: ""; position: absolute; left: 5px; top: 10px; bottom: 14px; border-left: 1px solid var(--rule-strong); }
.timeline li { position: relative; padding-left: 1.6rem; padding-bottom: 1.2rem; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before { content: ""; position: absolute; left: 0; top: 0.45rem; width: 10px; height: 10px; background: var(--accent); border-radius: 2px; }
.timeline-date { font-size: 0.83rem; font-weight: 600; color: var(--accent); }
.timeline-text { margin-top: 0.2rem; max-width: 64ch; }

.source-list-block { padding: 1.1rem 1.25rem; background: var(--surface); border: 1px solid var(--rule-strong); border-radius: var(--radius-lg); }
.source-list { list-style: none; margin-top: 0.6rem; }
.source-list li { padding-block: 0.6rem; border-top: 1px solid var(--rule); font-size: 0.92rem; line-height: 1.5; }
.source-list li:first-child { padding-top: 0; border-top: 0; }
.source-list__meta { display: block; margin-top: 0.15rem; font-size: 0.78rem; color: var(--ink-muted); }

.archive-note { margin-top: 1.25rem; padding: 0.8rem 1rem; background: var(--surface); border-left: 3px solid var(--accent); }
.method p { margin-top: 0.6rem; font-size: 0.9rem; color: var(--ink-muted); }
.related ul { list-style: none; display: grid; gap: 0.3rem; margin-top: 0.5rem; }
.related a { display: inline-flex; align-items: center; min-height: 44px; }
.mobile-facts { margin-top: 1.25rem; }

.empty-state {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px dashed var(--edge);
  border-radius: var(--radius);
  font-size: 0.94rem;
  color: var(--ink-muted);
}

/* Tabs (project profiles) */
.tabs { margin-top: 1.5rem; }
.tabs__list { display: flex; flex-wrap: wrap; gap: 0.4rem; border-bottom: 1px solid var(--rule-strong); }
.tabs__tab {
  min-height: 44px;
  padding: 0.5rem 0.95rem;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: 0;
  border-radius: var(--radius) var(--radius) 0 0;
  color: var(--ink-muted);
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
}
.tabs__tab[aria-selected="true"] { background: var(--surface); border-color: var(--rule-strong); color: var(--accent); margin-bottom: -1px; }
.tabs__panel { padding-top: 1.25rem; outline-offset: 4px; }
.tabs.is-enhanced .tabs__panel[hidden] { display: none; }

/* Pager */
.pager { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.6rem; margin-top: 1.5rem; }
.pager__link { display: inline-flex; align-items: center; min-height: 44px; padding: 0.4rem 0.9rem; border: 1px solid var(--edge); border-radius: var(--radius); text-decoration: none; }
.pager__link.is-disabled { color: var(--ink-muted); border-style: dashed; }
.pager__status { font-size: 0.85rem; color: var(--ink-muted); }

/* Downloads and embeds */
.download-block { margin-top: 2rem; padding: 1.15rem; background: var(--surface-alt); border: 1px solid var(--rule-strong); border-radius: var(--radius-lg); }
.download-block__note { margin-top: 0.5rem; font-size: 0.9rem; color: var(--ink-muted); }
.download-block__links { margin-top: 0.8rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.embed-code { margin-top: 1rem; }
.embed-code summary { min-height: 44px; display: flex; align-items: center; cursor: pointer; font-weight: 600; }
.embed-code pre { overflow-x: auto; padding: 0.8rem; background: var(--surface); border: 1px solid var(--rule-strong); border-radius: var(--radius); font-family: var(--mono); font-size: 0.8rem; }
.dataset-summary { margin-top: 1.5rem; padding: 1.15rem; background: var(--surface); border: 1px solid var(--rule-strong); border-radius: var(--radius-lg); }

.profile-head { padding-block: clamp(1.5rem, 4vw, 2.5rem) 0; }
.profile-head h1 { font-size: clamp(2rem, 4.6vw, 2.9rem); }
.profile-head__symbol { font-size: 0.55em; color: var(--ink-muted); }
.profile-head__links { margin-top: 0.7rem; font-size: 0.92rem; }
.profile-head__chains, .profile-head__meta { margin-top: 0.6rem; font-size: 0.85rem; color: var(--ink-muted); }

.page-foot { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--rule); display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; font-size: 0.9rem; }

/* Footer */
.site-footer { margin-top: clamp(2rem, 5vw, 3.5rem); padding-block: clamp(2rem, 4vw, 3rem); background: var(--strip-bg); color: var(--strip-ink); }
.footer-grid { display: grid; gap: 1.75rem; }
.footer-mark { font-family: var(--serif); font-size: 1.2rem; font-weight: 600; color: var(--strip-ink); }
.footer-about p + p { margin-top: 0.5rem; font-size: 0.875rem; color: var(--strip-muted); }
.footer-note { font-size: 0.8rem; }
.footer-title { margin-bottom: 0.5rem; font-family: var(--sans); font-size: 0.78rem; font-weight: 600; color: var(--strip-muted); }
.footer-nav ul { list-style: none; }
.footer-nav a { display: inline-flex; align-items: center; min-height: 44px; padding-right: 0.75rem; color: var(--strip-ink); font-size: 0.94rem; }
.footer-nav a:hover { color: var(--strip-ink); text-decoration: underline; }
.footer-base { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid rgba(255, 255, 255, 0.18); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem; font-size: 0.82rem; color: var(--strip-muted); }
.footer-base a { color: var(--strip-ink); }

/* Embed widgets: framed by third party sites with the credit visible */
.embed-body { margin: 0; padding: 0.9rem; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 0.9rem; }
.embed-title { font-family: var(--serif); font-size: 1rem; }
.embed-list { list-style: none; margin-top: 0.6rem; }
.embed-list li { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.35rem; padding-block: 0.45rem; border-top: 1px solid var(--rule); }
.embed-list li:first-child { border-top: 0; padding-top: 0; }
.embed-value { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.embed-credit { margin-top: 0.75rem; padding-top: 0.6rem; border-top: 1px solid var(--rule); font-size: 0.78rem; color: var(--ink-muted); }
.embed-credit span { display: block; }

/* Tablet */
@media (max-width: 899px) {
  .header-tools .btn-text { display: none; }
  .wordmark__text { font-size: 1.2rem; }
  /* Sections opens a full width panel so the collapsed header stays one row. */
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 20;
    margin: 0;
    padding: 0.35rem clamp(1rem, 4vw, 2.5rem) 1rem;
    background: var(--paper);
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule-strong);
    box-shadow: 0 14px 24px rgba(0, 0, 0, 0.08);
  }
}

@media (min-width: 640px) {
  .card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bg-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-grid { grid-template-columns: minmax(0, 15rem) minmax(0, 1fr); gap: 2.5rem; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
  .filter-bar { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: end; }
  .filter-bar__actions { grid-column: 1 / -1; }
  .data-blocks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* Desktop navigation and compositions */
@media (min-width: 900px) {
  .nav-disclosure { order: 2; flex-basis: auto; }
  .nav-toggle { display: none; }
  .nav-disclosure { display: none; }
  .site-nav--desktop { display: block; order: 2; }
  .site-nav {
    display: block;
    position: static;
    padding: 0;
    margin: 0;
    background: transparent;
    border: 0;
    box-shadow: none;
  }
  .site-nav ul { flex-direction: row; flex-wrap: wrap; gap: 0.15rem 1rem; }
  .site-nav a { padding-right: 0; }
  .nav-secondary { display: none; }
  .header-tools { order: 3; }
  .lead-grid { grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); align-items: start; }
  .card-grid--wide { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: minmax(0, 1.3fr) repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1040px) {
  .article-grid { grid-template-columns: minmax(0, 680px) minmax(0, 1fr); align-items: start; }
  .article-side { display: block; min-width: 0; }
  .rail-sticky { position: sticky; top: 1.5rem; }
  .mobile-facts { display: none; }
}

@media (max-width: 1039px) {
  .article-side { display: none; }
}