/* Thread Witness site stylesheet. System fonts only; no third-party requests. */

:root {
  color-scheme: light dark;

  --bg: #fbfaf7;
  --surface: #f2f0ea;
  --surface-2: #e9e6de;
  --text: #1b2128;
  --muted: #4f5862;
  --border: #d6d1c6;
  --border-strong: #8a8476;
  --accent: #0b5a6b;
  --accent-hover: #07404d;
  --on-accent: #ffffff;
  --thread: #b8461b;
  --focus: #0b5a6b;
  --notice-bg: #eef4f5;
  --dev-bg: #f8f0e3;

  --badge-r-bg: #e1ecf7; --badge-r-fg: #17497a;
  --badge-a-bg: #e0f0e6; --badge-a-fg: #1b5636;
  --badge-i-bg: #f9edd6; --badge-i-fg: #714306;
  --badge-s-bg: #ece7f4; --badge-s-fg: #4a3a69;

  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --serif: ui-serif, "Iowan Old Style", "Charter", "Bitstream Charter", Georgia, Cambria, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --measure: 68ch;
  --gutter: 16px;
  --radius: 6px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121619;
    --surface: #1a2025;
    --surface-2: #222a30;
    --text: #e8e5de;
    --muted: #a9b1b9;
    --border: #2f383f;
    --border-strong: #6b7782;
    --accent: #7fc9d8;
    --accent-hover: #a8dce6;
    --on-accent: #0d1214;
    --thread: #ef8b5e;
    --focus: #7fc9d8;
    --notice-bg: #172429;
    --dev-bg: #262016;

    --badge-r-bg: #16304a; --badge-r-fg: #b1d3f3;
    --badge-a-bg: #163826; --badge-a-fg: #a9dfbf;
    --badge-i-bg: #3a2b0f; --badge-i-fg: #f1d193;
    --badge-s-bg: #2b2440; --badge-s-fg: #d3c7ec;
  }
}

/* Base */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-wrap: break-word;
  font-kerning: normal;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover { color: var(--accent-hover); text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 2px;
}
main:focus { outline: none; }

.wrap {
  width: 100%;
  max-width: 70rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
}
@media (min-width: 48rem) { :root { --gutter: 2rem; } }

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -100px;
  z-index: 10;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: var(--on-accent);
  border-radius: var(--radius);
  font-weight: 600;
}
.skip-link:focus { top: 0.75rem; color: var(--on-accent); }

/* Header */

.site-header {
  position: relative;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text);
  text-decoration: none;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.005em;
  padding: 0.5rem 0;
}
.wordmark:hover { color: var(--text); }
.mark { width: 30px; height: 30px; flex: none; color: var(--text); }
.mark .tw-thread { stroke: var(--thread); }
.mark .tw-thread-gap { stroke: var(--bg); }

.site-nav ul { list-style: none; margin: 0; padding: 0; }
.site-nav a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.97rem;
}
.site-nav a:hover { color: var(--accent); text-decoration: underline; }
.site-nav a[aria-current="page"] {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.35em;
}

/* Mobile menu: details/summary, no script. */
.menu summary {
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0 0.85rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  user-select: none;
}
.menu summary::-webkit-details-marker { display: none; }
.menu-icon,
.menu-icon::before,
.menu-icon::after {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}
.menu-icon { position: relative; }
.menu-icon::before, .menu-icon::after { content: ""; position: absolute; left: 0; }
.menu-icon::before { top: -5px; }
.menu-icon::after { top: 5px; }
.menu[open] .menu-icon { background: transparent; }
.menu[open] .menu-icon::before { top: 0; transform: rotate(45deg); }
.menu[open] .menu-icon::after { top: 0; transform: rotate(-45deg); }

.menu-list {
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 5;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0.25rem var(--gutter) 0.75rem !important;
  box-shadow: 0 12px 24px -16px rgb(0 0 0 / 0.35);
}
.menu-list li + li { border-top: 1px solid var(--border); }
.menu-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  font-size: 1.05rem;
}

.nav-list { display: none; }

@media (min-width: 62rem) {
  .menu { display: none; }
  .nav-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1.4rem;
  }
  .nav-list a { display: inline-block; padding: 0.5rem 0; }
}

/* Content */

main { display: block; }
.content { padding-top: 2.5rem; padding-bottom: 4.5rem; }
@media (min-width: 48rem) { .content { padding-top: 4rem; padding-bottom: 6rem; } }

.content > *,
.report > * {
  max-width: var(--measure);
}
.content > .table-wrap,
.report > .table-wrap,
.content > .report,
.content > hr,
.report > hr { max-width: none; }

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.005em;
  text-wrap: balance;
  color: var(--text);
}
h1 {
  font-size: clamp(2rem, 1.4rem + 3vw, 3rem);
  margin: 0 0 1.25rem;
  letter-spacing: -0.015em;
}
h2 {
  font-size: clamp(1.45rem, 1.2rem + 1vw, 1.8rem);
  margin: 3.5rem 0 1rem;
}
h3 {
  font-family: var(--sans);
  font-size: 1.1rem;
  font-weight: 650;
  margin: 2.25rem 0 0.75rem;
  letter-spacing: 0;
}
h2 + h3 { margin-top: 1.25rem; }

p, ul, ol { margin: 0 0 1.1rem; }
ul, ol { padding-left: 1.35rem; }
li { margin-bottom: 0.45rem; }
li::marker { color: var(--muted); }
strong { font-weight: 650; }

.lede {
  font-size: clamp(1.15rem, 1.05rem + 0.5vw, 1.3rem);
  line-height: 1.5;
  color: var(--text);
  margin-bottom: 1.75rem;
}
.meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: -0.5rem;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 3.5rem 0;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05em 0.35em;
  overflow-wrap: anywhere;
}

/* Notes and callouts */

.notice,
.callout {
  background: var(--notice-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  margin: 1.75rem 0;
  font-size: 0.98rem;
}
.callout > :last-child { margin-bottom: 0; }
.callout ul { margin-top: 0.5rem; }
.callout-sample { border-left-color: var(--thread); background: var(--dev-bg); }
.callout-dev { border-left-color: var(--thread); background: var(--dev-bg); }

.label-sample {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
  border: 1px dashed var(--border-strong);
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  margin-bottom: 1rem;
}

/* Action rows */

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  margin: 1.5rem 0 2rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.98rem;
  line-height: 1.25;
  text-decoration: none;
}
.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
  border: 1px solid var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--on-accent); }
.btn-quiet {
  padding-left: 0;
  padding-right: 0;
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
.btn-quiet::after { content: " \2192"; white-space: pre; }
.actions-text { color: var(--muted); font-size: 0.95rem; }

/* Home page */

.page-index h1 {
  font-size: clamp(2.25rem, 1.5rem + 3.6vw, 3.6rem);
  max-width: 18ch;
  margin-top: 0.5rem;
}
.page-index .content > h2 {
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}
.page-index .content > hr { display: none; }

/* Claim-type badges */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  vertical-align: 0.05em;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  padding: 0.22em 0.55em 0.22em 0.25em;
  border-radius: 999px;
  border: 1px solid currentColor;
}
.badge-key {
  display: inline-grid;
  place-items: center;
  min-width: 1.45em;
  height: 1.45em;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.9em;
  font-weight: 700;
}
.badge-reported { background: var(--badge-r-bg); color: var(--badge-r-fg); }
.badge-aggregated { background: var(--badge-a-bg); color: var(--badge-a-fg); }
.badge-inferred { background: var(--badge-i-bg); color: var(--badge-i-fg); }
.badge-secondhand { background: var(--badge-s-bg); color: var(--badge-s-fg); }
/* Key letter: reversed out of the badge colour. */
.badge-reported .badge-key { background: var(--badge-r-fg); color: var(--badge-r-bg); }
.badge-aggregated .badge-key { background: var(--badge-a-fg); color: var(--badge-a-bg); }
.badge-inferred .badge-key { background: var(--badge-i-fg); color: var(--badge-i-bg); }
.badge-secondhand .badge-key { background: var(--badge-s-fg); color: var(--badge-s-bg); }

/* Tables */

.table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1.25rem 0 1.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  line-height: 1.45;
  font-variant-numeric: tabular-nums;
}
th, td {
  text-align: left;
  vertical-align: top;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border);
}
th {
  background: var(--surface);
  font-weight: 650;
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  color: var(--text);
  white-space: nowrap;
  border-bottom: 1px solid var(--border-strong);
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:nth-child(even) td { background: color-mix(in srgb, var(--surface) 45%, transparent); }
td.num, th.num { text-align: right; }
td.num, td.trend, td.date { white-space: nowrap; }
td code { white-space: nowrap; }
td.code-wrap code { white-space: normal; overflow-wrap: anywhere; }
td.id { font-family: var(--mono); font-size: 0.86em; white-space: nowrap; }

@media (max-width: 40rem) {
  table { font-size: 0.88rem; }
  th, td { padding: 0.5rem 0.65rem; }
  td { min-width: 6rem; }
  td.num { min-width: 0; }
  /* Sentences in cells: wide enough to read; the table scrolls inside its frame. */
  td.text { min-width: 11rem; }
}

/* Sample report document frame */

.report {
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: var(--bg);
  padding: 1.5rem var(--gutter) 1rem;
  margin: 2rem calc(-1 * var(--gutter) + 0px) 2.5rem;
  box-shadow: 0 1px 0 var(--border), 0 18px 40px -30px rgb(0 0 0 / 0.35);
}
@media (max-width: 47.99rem) {
  .report { margin-left: 0; margin-right: 0; padding: 1.25rem 1rem 0.75rem; }
}
@media (min-width: 48rem) {
  .report { padding: 2.5rem 2.5rem 1.5rem; margin-left: 0; margin-right: 0; }
}
.report h1 { font-size: clamp(1.7rem, 1.3rem + 2vw, 2.4rem); }
.report h2 {
  font-size: clamp(1.3rem, 1.15rem + 0.8vw, 1.6rem);
  margin-top: 2.75rem;
}
.report hr { margin: 2.75rem 0; }

.page-sample-report .content > .callout { max-width: var(--measure); }

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.93rem;
}
.footer-inner {
  padding-top: 2rem;
  padding-bottom: 2.5rem;
  display: grid;
  gap: 0.6rem;
}
.footer-list {
  list-style: none;
  margin: 0 0 0.25rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
}
.footer-list li { margin: 0; }
.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--text);
}
.footer-list a[aria-current="page"] { color: var(--accent); }
.site-footer p { margin: 0; }
.footer-contact a { color: var(--accent); }

/* Print */

@media print {
  .site-header nav, .skip-link, .site-footer nav { display: none; }
  .table-wrap { overflow: visible; border: 0; }
  a { color: inherit; }
  .report { box-shadow: none; border: 0; padding: 0; }
}

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