:root {
  color-scheme: light;
  --bg: #f7f7f8;
  --surface: #ffffff;
  --surface-2: #eeeeef;
  --surface-3: #e4e4e6;
  --text: #111111;
  --muted: #57585d;
  --faint: #8a8c92;
  --line: #c9cbd1;
  --strong-line: #111111;
  --red: #e4002b;
  --blue: #002fa7;
  --amber: #ffb800;
  --green: #00a56a;
  --max: 1440px;
  --mono: "SFMono-Regular", "IBM Plex Mono", Consolas, "Liberation Mono", monospace;
  --sans: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}

:root[data-theme="night"] {
  color-scheme: dark;
  --bg: #06070a;
  --surface: #0f1117;
  --surface-2: #171a22;
  --surface-3: #232733;
  --text: #f5f6f8;
  --muted: #b7bac3;
  --faint: #7c818e;
  --line: #353a46;
  --strong-line: #f5f6f8;
  --red: #ff334f;
  --blue: #78a4ff;
  --amber: #ffcc4d;
  --green: #38d996;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  letter-spacing: 0;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--line) 26%, transparent) 1px, transparent 1px) 0 0 / 80px 80px,
    linear-gradient(180deg, color-mix(in srgb, var(--line) 24%, transparent) 1px, transparent 1px) 0 0 / 80px 80px,
    var(--bg);
}

body,
button,
input {
  font: inherit;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

button,
input {
  border-radius: 0;
}

button {
  cursor: pointer;
}

input {
  min-width: 0;
}

h1,
h2,
h3,
p,
dl,
dd,
ol,
ul {
  margin-top: 0;
}

p,
li,
dd {
  line-height: 1.82;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: 16px;
  z-index: 100;
  transform: translateY(-140%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 12px;
}

.skip-link:focus {
  transform: translateY(0);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto auto;
  min-height: 64px;
  border-bottom: 1px solid var(--strong-line);
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(10px);
}

.brand,
.topnav,
.top-actions {
  display: flex;
  align-items: center;
}

.brand {
  gap: 14px;
  padding: 10px 24px;
  border-right: 1px solid var(--line);
  text-decoration: none;
}

.brand-kicker,
.section-code,
.meta-badges,
.source-ticker,
.folio,
.row-index,
.row-kind,
.fact-list dt,
.rail-stats dt,
.rail-stats dd,
.article-card-top,
.article-card-bottom,
.progress-box,
.form-note {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.35;
  letter-spacing: 0;
}

.brand-kicker {
  color: var(--red);
  font-weight: 700;
}

.brand strong {
  font-size: 24px;
  line-height: 1;
}

.topnav {
  gap: 2px;
  padding: 0 16px;
}

.topnav a,
.text-action,
.subscribe-link,
.theme-toggle {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  border-left: 1px solid transparent;
  border-right: 1px solid transparent;
  text-decoration: none;
}

.text-action {
  color: var(--text);
  background: transparent;
  border-top: 0;
  border-bottom: 0;
  font: inherit;
}

.topnav a:hover,
.text-action:hover,
.theme-toggle:hover {
  border-color: var(--line);
  background: var(--surface-2);
}

.top-actions {
  justify-content: flex-end;
  border-left: 1px solid var(--line);
  padding: 0 16px;
  gap: 8px;
}

.theme-toggle {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line);
}

.subscribe-link,
.source-button,
.rss-button,
.weekly-form button,
.lead-actions a {
  background: var(--red);
  color: #ffffff;
  border: 1px solid var(--red);
  text-decoration: none;
  font-weight: 700;
}

.subscribe-link:hover,
.source-button:hover,
.rss-button:hover,
.weekly-form button:hover,
.lead-actions a:hover {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
}

.source-ticker {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--muted);
  white-space: nowrap;
}

.source-ticker span {
  display: inline-block;
  padding: 8px 24px;
  min-width: 100%;
}

.page {
  width: min(100%, var(--max));
  margin: 0 auto;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
}

.home-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: calc(100vh - 96px);
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.desk-rail {
  border-right: 1px solid var(--strong-line);
  background: var(--surface);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.rail-brand {
  display: grid;
  gap: 8px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 18px;
}

.rail-brand span {
  color: var(--red);
  font-family: var(--mono);
  font-size: 12px;
}

.rail-brand strong {
  font-size: 28px;
  line-height: 1.05;
}

.rail-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.rail-stats div {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 12px;
}

.rail-stats dt {
  color: var(--muted);
}

.rail-stats dd {
  margin: 6px 0 0;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
}

.rail-nav {
  display: grid;
  gap: 8px;
}

.rail-nav a {
  border: 1px solid var(--line);
  padding: 12px;
  text-decoration: none;
  background: var(--bg);
}

.rail-nav a:hover {
  background: var(--text);
  color: var(--bg);
}

.desk-rail p {
  color: var(--muted);
  margin-top: auto;
}

.home-main {
  min-width: 0;
}

.command-search {
  border-bottom: 1px solid var(--strong-line);
  background: var(--surface);
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 22px;
  align-items: start;
}

.command-search label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  padding-top: 13px;
}

.command-search input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  padding: 0 14px;
  font-family: var(--mono);
}

.command-search input:focus {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.search-results {
  grid-column: 2;
  display: grid;
  gap: 8px;
}

.search-results p {
  color: var(--muted);
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
}

.search-result {
  display: grid;
  gap: 3px;
  border: 1px solid var(--line);
  padding: 10px;
  text-decoration: none;
  background: var(--surface-2);
}

.search-result span,
.search-result small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.search-result p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.search-result-group {
  display: grid;
  gap: 8px;
  padding-top: 4px;
}

.search-result-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  border-bottom: 1px solid var(--line);
  padding: 4px 0;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}

.search-result-heading strong {
  color: var(--text);
}

.briefing-board {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(320px, 1fr);
  border-bottom: 1px solid var(--strong-line);
}

.site-intro {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 24px;
  padding: 30px 24px;
  border-bottom: 1px solid var(--strong-line);
  background: var(--surface);
}

.site-intro h2 {
  font-size: 32px;
  line-height: 1.18;
  margin: 0 0 16px;
  max-width: 900px;
}

.site-intro p {
  max-width: 920px;
  color: var(--muted);
  font-size: 16px;
}

.lead-briefing {
  padding: 32px 24px 24px;
  border-right: 1px solid var(--line);
  background: var(--bg);
}

.lead-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.meta-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.meta-badges span,
.chip {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  padding: 4px 8px;
  text-decoration: none;
}

.meta-badges .signal {
  background: var(--red);
  color: #ffffff;
  border-color: var(--red);
  font-weight: 700;
}

.lead-number {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--muted);
}

.lead-briefing h1 {
  font-size: 64px;
  line-height: 1.02;
  margin: 32px 0 26px;
  max-width: 920px;
}

.lead-summary {
  list-style: none;
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 0 0 28px;
  max-width: 850px;
}

.lead-summary li {
  border-left: 4px solid var(--red);
  padding-left: 14px;
  font-size: 18px;
}

.lead-actions {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  font-family: var(--mono);
}

.lead-actions a,
.source-button,
.rss-button,
.weekly-form button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
}

.secondary-board {
  background: var(--surface);
  min-width: 0;
}

.panel-head {
  border-bottom: 1px solid var(--line);
  padding: 18px 20px;
}

.panel-head h2 {
  margin: 4px 0 0;
  font-size: 20px;
}

.section-code {
  display: inline-block;
  color: var(--red);
  font-weight: 700;
}

.compact-row {
  display: grid;
  grid-template-columns: 44px 120px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: baseline;
  border-bottom: 1px solid var(--line);
  padding: 18px 20px;
  text-decoration: none;
  background: var(--surface);
}

.compact-row:hover {
  background: var(--surface-2);
}

.compact-row strong {
  font-size: 20px;
  line-height: 1.35;
}

.compact-row small {
  color: var(--muted);
  font-family: var(--mono);
}

.secondary-board .compact-row {
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: start;
}

.secondary-board .row-kind,
.secondary-board .compact-row strong,
.secondary-board .compact-row small {
  grid-column: 2;
}

.secondary-board .row-kind {
  width: max-content;
}

.secondary-board .compact-row strong {
  font-size: 20px;
}

.row-index {
  color: var(--red);
  font-weight: 700;
}

.row-kind {
  border: 1px solid var(--line);
  padding: 4px 6px;
  text-align: center;
}

.home-matrix {
  display: grid;
  grid-template-columns: minmax(300px, 0.8fr) minmax(0, 1.2fr);
  border-bottom: 1px solid var(--strong-line);
}

.panel {
  background: var(--surface);
  min-width: 0;
}

.source-radar {
  border-right: 1px solid var(--line);
}

.radar-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 20px;
}

.radar-cell {
  border: 1px solid var(--line);
  padding: 12px;
  display: grid;
  gap: 10px;
  text-decoration: none;
  background: var(--bg);
}

.radar-cell strong {
  font-family: var(--mono);
}

.radar-cell span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.lane-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.lane-card {
  min-height: 230px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 20px;
  text-decoration: none;
  background: var(--surface);
}

.lane-card:hover {
  background: var(--surface-2);
}

.lane-card span,
.lane-card small {
  font-family: var(--mono);
  color: var(--muted);
}

.lane-card strong {
  display: block;
  font-size: 26px;
  line-height: 1.15;
  margin: 18px 0 14px;
}

.lane-card p {
  color: var(--muted);
}

.reading-purpose-panel {
  border-bottom: 1px solid var(--strong-line);
}

.purpose-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.purpose-grid.compact {
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.purpose-card {
  min-height: 210px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 20px;
  text-decoration: none;
  background: var(--surface);
}

.purpose-card:hover {
  background: var(--surface-2);
}

.purpose-card span,
.purpose-card small {
  font-family: var(--mono);
  color: var(--muted);
}

.purpose-card strong {
  display: block;
  font-size: 24px;
  line-height: 1.18;
  margin: 18px 0 14px;
}

.purpose-card p {
  color: var(--muted);
  margin-bottom: 18px;
}

.purpose-section {
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.purpose-section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 20px;
  align-items: start;
  padding: 28px 32px;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.purpose-section-head h2 {
  font-size: 34px;
  line-height: 1.15;
  margin: 8px 0 10px;
}

.purpose-section-head p {
  max-width: 760px;
  color: var(--muted);
  margin: 0;
}

.purpose-section-head > strong {
  border: 1px solid var(--line);
  padding: 8px 10px;
  font-family: var(--mono);
}

.empty-section {
  padding: 22px 32px;
  margin: 0;
}

.glossary-strip {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  border-bottom: 1px solid var(--strong-line);
  background: var(--surface);
  align-items: stretch;
}

.glossary-strip > strong {
  background: var(--text);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
}

.glossary-strip div {
  display: flex;
  overflow-x: auto;
}

.glossary-strip a {
  flex: 0 0 auto;
  min-width: 260px;
  border-right: 1px solid var(--line);
  padding: 14px 18px;
  text-decoration: none;
}

.glossary-strip b {
  font-family: var(--mono);
  margin-right: 8px;
}

.glossary-category-nav {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--strong-line);
  background: var(--surface);
}

.glossary-category-link {
  min-height: 112px;
  display: grid;
  align-content: space-between;
  gap: 12px;
  border-right: 1px solid var(--line);
  padding: 16px;
  text-decoration: none;
}

.glossary-category-link:hover {
  background: var(--surface-2);
}

.glossary-category-link strong {
  font-size: 18px;
  line-height: 1.25;
}

.glossary-category-link span {
  font-family: var(--mono);
  color: var(--muted);
  font-size: 12px;
}

.glossary-category {
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.glossary-category .table-panel {
  border-left: 0;
  border-right: 0;
}

.keyword-table tr:target {
  outline: 2px solid var(--red);
  outline-offset: -2px;
}

.weekly-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 460px);
  gap: 0;
  background: var(--bg);
}

.weekly-panel > div:first-child {
  padding: 34px 24px;
  border-right: 1px solid var(--line);
}

.weekly-panel h2 {
  font-size: 36px;
  line-height: 1.15;
  margin: 10px 0 16px;
}

.newsletter-panel {
  display: grid;
  gap: 18px;
  padding: 24px;
  background: var(--surface);
}

.newsletter-panel h2 {
  margin: 6px 0 10px;
}

.weekly-form,
.bookmark-card {
  display: grid;
  gap: 10px;
}

.weekly-form {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.weekly-form label {
  font-weight: 700;
}

.weekly-form-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.weekly-form input {
  min-height: 44px;
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  padding: 0 12px;
  font: inherit;
}

.bookmark-card {
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.bookmark-card h3 {
  margin: 0;
}

.form-note {
  min-height: 18px;
  margin: 0;
  color: var(--muted);
}

.form-note a {
  color: var(--text);
}

.archive-hero {
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--strong-line);
  background: var(--surface);
  padding: 48px 32px;
}

.archive-hero h1 {
  font-size: 56px;
  line-height: 1.05;
  margin: 10px 0 16px;
}

.archive-hero p,
.policy li {
  max-width: 850px;
  font-size: 17px;
}

.archive-list,
.archive-grid,
.table-panel {
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.article-card {
  display: grid;
  gap: 16px;
  border-bottom: 1px solid var(--line);
  padding: 20px;
  background: var(--surface);
  text-decoration: none;
}

.article-card-top,
.article-card-bottom {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
}

.article-card h3 {
  font-size: 24px;
  line-height: 1.2;
  margin: 0;
}

.article-card p {
  margin: 0;
  color: var(--muted);
}

.reader-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 300px;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.source-rail,
.reading-rail {
  background: var(--surface-2);
}

.source-rail {
  border-right: 1px solid var(--line);
}

.reading-rail {
  border-left: 1px solid var(--line);
  padding: 24px;
  align-self: start;
  position: sticky;
  top: 104px;
  max-height: calc(100vh - 104px);
  overflow-y: auto;
}

.rail-card {
  position: sticky;
  top: 104px;
  padding: 24px;
}

.fact-list {
  display: grid;
  gap: 0;
  margin: 18px 0;
}

.fact-list div {
  border-top: 1px solid var(--line);
  padding: 15px 0;
}

.fact-list dt {
  color: var(--muted);
  margin-bottom: 5px;
}

.fact-list dd {
  margin: 0;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.fact-list .chip {
  margin: 4px 4px 0 0;
}

.source-button {
  width: 100%;
  text-align: center;
}

.source-button.inline {
  width: auto;
  margin-top: 12px;
}

.reader-column {
  min-width: 0;
  background: var(--bg);
}

.article-hero {
  padding: 52px 40px 34px;
  border-bottom: 1px solid var(--strong-line);
}

.article-hero h1 {
  font-size: 56px;
  line-height: 1.08;
  margin: 28px 0 20px;
}

.article-hero p {
  max-width: 780px;
  color: var(--muted);
}

.article-section {
  padding: 34px 40px;
  border-bottom: 1px solid var(--line);
}

.article-section h2 {
  font-size: 32px;
  line-height: 1.15;
  margin: 8px 0 20px;
}

.article-section p,
.article-section li {
  font-size: 17px;
}

.executive-summary {
  background: var(--surface);
}

.executive-summary ol {
  list-style: none;
  counter-reset: summary;
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
}

.executive-summary li {
  counter-increment: summary;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.executive-summary li::before {
  content: counter(summary, decimal-leading-zero);
  color: var(--red);
  font-family: var(--mono);
  font-weight: 700;
}

.number-list,
.try-panel ol {
  display: grid;
  gap: 12px;
  padding-left: 24px;
}

.try-panel {
  background: color-mix(in srgb, var(--blue) 8%, var(--bg));
}

.caution-panel {
  background: color-mix(in srgb, var(--amber) 14%, var(--bg));
}

.keyword-table,
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}

.keyword-table th,
.keyword-table td,
.data-table th,
.data-table td {
  border: 1px solid var(--line);
  padding: 12px;
  text-align: left;
  vertical-align: top;
  line-height: 1.6;
}

.keyword-table th,
.data-table th {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  background: var(--surface-2);
}

.keyword-table td:first-child,
.data-table td:first-child {
  font-family: var(--mono);
  font-weight: 700;
}

.source-links {
  display: grid;
  gap: 10px;
  padding-left: 20px;
}

.related-note-list {
  margin-top: 26px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

.related-note-list h3 {
  font-size: 20px;
  margin: 0;
}

.related-note-list .compact-row {
  grid-template-columns: 38px 110px minmax(0, 1fr);
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.related-note-list .compact-row small {
  grid-column: 3;
}

.progress-box {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
  margin: 22px 0;
}

.progress-box > div:first-child {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.progress-track {
  height: 4px;
  background: var(--line);
  margin-top: 10px;
}

.progress-track span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--red);
}

.section-nav {
  display: grid;
  gap: 2px;
}

.section-nav a {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.section-nav a:hover {
  color: var(--red);
}

.quick-glossary {
  margin-top: 26px;
  display: grid;
  gap: 12px;
}

.mini-term {
  border: 1px solid var(--line);
  padding: 12px;
  background: var(--surface);
}

.mini-term strong {
  display: block;
  font-family: var(--mono);
  margin-bottom: 4px;
}

.mini-term span {
  color: var(--muted);
}

.mobile-source-action {
  display: none;
}

.weekly-section {
  max-width: 900px;
}

.muted {
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--strong-line);
  background: var(--surface);
}

.footer-grid {
  width: min(100%, var(--max));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  padding: 28px 24px;
}

.footer-grid p {
  margin: 8px 0 0;
  color: var(--muted);
}

.footer-grid nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

@media (max-width: 1180px) {
  .topbar {
    grid-template-columns: 1fr auto;
  }

  .topnav {
    grid-column: 1 / -1;
    border-top: 1px solid var(--line);
    overflow-x: auto;
  }

  .reader-layout {
    grid-template-columns: 240px minmax(0, 1fr);
  }

  .reading-rail {
    display: none;
  }

  .mobile-source-action {
    position: fixed;
    left: 16px;
    right: 16px;
    bottom: 16px;
    z-index: 40;
    display: flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    background: var(--red);
    color: #ffffff;
    border: 1px solid var(--red);
    text-decoration: none;
    font-weight: 700;
  }
}

@media (max-width: 900px) {
  .topbar {
    position: static;
    display: grid;
    grid-template-columns: 1fr;
  }

  .brand,
  .top-actions,
  .topnav {
    border-right: 0;
    border-left: 0;
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand {
    justify-content: space-between;
  }

  .brand-kicker {
    display: none;
  }

  .top-actions {
    justify-content: stretch;
    border-top: 1px solid var(--line);
  }

  .top-actions > * {
    flex: 1;
  }

  .weekly-form-row {
    grid-template-columns: 1fr;
  }

  .home-shell,
  .briefing-board,
  .site-intro,
  .home-matrix,
  .weekly-panel,
  .reader-layout {
    grid-template-columns: 1fr;
  }

  .desk-rail,
  .lead-briefing,
  .source-radar,
  .weekly-panel > div:first-child,
  .source-rail {
    border-right: 0;
  }

  .desk-rail {
    padding: 20px 16px;
  }

  .rail-stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .rail-nav {
    grid-template-columns: repeat(5, 1fr);
  }

  .rail-nav a {
    text-align: center;
  }

  .command-search {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .search-results {
    grid-column: auto;
  }

  .lead-briefing h1,
  .article-hero h1,
  .archive-hero h1 {
    font-size: 40px;
  }

  .lead-briefing,
  .article-hero,
  .article-section,
  .archive-hero {
    padding-left: 20px;
    padding-right: 20px;
  }

  .secondary-board {
    border-top: 1px solid var(--line);
  }

  .lane-grid {
    grid-template-columns: 1fr 1fr;
  }

  .purpose-grid,
  .glossary-category-nav {
    grid-template-columns: 1fr 1fr;
  }

  .purpose-section-head {
    grid-template-columns: 1fr;
    padding-left: 20px;
    padding-right: 20px;
  }

  .source-rail {
    border-bottom: 1px solid var(--strong-line);
  }

  .reader-column {
    order: 1;
  }

  .source-rail {
    order: 2;
  }

  .rail-card {
    position: static;
  }
}

@media (max-width: 640px) {
  body {
    background: var(--bg);
  }

  .brand strong {
    font-size: 22px;
  }

  .source-ticker span {
    padding-left: 16px;
  }

  .rail-stats,
  .rail-nav,
  .radar-grid,
  .lane-grid,
  .purpose-grid,
  .glossary-category-nav,
  .glossary-strip,
  .compact-row {
    grid-template-columns: 1fr;
  }

  .lead-briefing h1,
  .article-hero h1,
  .archive-hero h1 {
    font-size: 32px;
  }

  .lead-summary li,
  .article-section p,
  .article-section li {
    font-size: 16px;
  }

  .lead-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .compact-row {
    gap: 8px;
  }

  .related-note-list .compact-row {
    grid-template-columns: 1fr;
  }

  .related-note-list .compact-row small {
    grid-column: auto;
  }

  .row-kind {
    width: max-content;
  }

  .glossary-strip > strong {
    min-height: 44px;
  }

  .glossary-strip div {
    display: grid;
  }

  .glossary-strip a {
    min-width: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .keyword-table,
  .data-table,
  .keyword-table thead,
  .data-table thead,
  .keyword-table tbody,
  .data-table tbody,
  .keyword-table tr,
  .data-table tr,
  .keyword-table td,
  .data-table td {
    display: block;
    width: 100%;
  }

  .keyword-table thead,
  .data-table thead {
    position: absolute;
    overflow: hidden;
    clip: rect(0 0 0 0);
    width: 1px;
    height: 1px;
  }

  .keyword-table tr,
  .data-table tr {
    border: 1px solid var(--line);
    margin-bottom: 12px;
  }

  .keyword-table td,
  .data-table td {
    border: 0;
    border-bottom: 1px solid var(--line);
  }

  .keyword-table td::before,
  .data-table td::before {
    content: attr(data-label);
    display: block;
    color: var(--muted);
    font-family: var(--mono);
    font-size: 12px;
    margin-bottom: 4px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    padding-bottom: 84px;
  }
}