:root {
  color-scheme: light;
  --canvas: #f0ecdf;
  --surface: #fffdf5;
  --surface-muted: #e8e3d5;
  --text: #233127;
  --muted: #596457;
  --accent: #153c29;
  --accent-hover: #0b2b1c;
  --on-accent: #fffdf5;
  --border: #b9c0ae;
  --focus: #d06b26;
  --rule: #cdd1c2;
  --shadow: 0 14px 30px rgba(30, 47, 34, .09);
  --serif: Georgia, 'Times New Roman', serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --canvas: #161915;
  --surface: #1f221c;
  --surface-muted: #292d25;
  --text: #f0ecdf;
  --muted: #b7b8aa;
  --accent: #b8d0b2;
  --accent-hover: #d0e5ca;
  --on-accent: #153c29;
  --border: #66705f;
  --focus: #f1a565;
  --rule: #4c5547;
  --shadow: 0 14px 30px rgba(0, 0, 0, .2);
}

* { box-sizing: border-box; }
.lead-story:not(:has(img)) { display: block; }
.lead-story:not(:has(img)) .lead-story-copy { max-width: 44rem; }
.lead-story:not(:has(img)) h2 { max-width: 24ch; }
#new-stories:not([hidden]) { display: block; margin-bottom: 1rem; padding: .8rem 1.2rem; color: var(--on-accent); background: var(--accent); border: 0; border-radius: .4rem; }
.article-prose { line-height: 1.8; }
.model-release-section { margin-block: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--rule); }
.model-section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.model-section-heading h2 { margin: .2rem 0; }
.model-section-heading > a { font-size: .85rem; }
.model-section-copy { color: var(--muted); max-width: 65ch; }
.model-release-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 1rem; }
.model-release-card { min-width: 0; padding: 1.2rem; border: 1px solid var(--border); background: var(--surface); border-radius: .4rem; display: flex; flex-direction: column; }
.model-release-card h3 { font: 700 1.15rem/1.3 var(--serif); margin: .4rem 0 .6rem; }
.model-release-label { color: var(--accent); font-size: .7rem; text-transform: uppercase; font-weight: 750; letter-spacing: .06em; margin: 0; }
.model-release-source,.model-release-date { color: var(--muted); font-size: .75rem; margin: .1rem 0; }
.model-release-summary { font-size: .87rem; }
.model-release-link { margin-top: auto; padding-top: .8rem; font-size: .8rem; font-weight: 650; }
.agent-playground { background: var(--surface); border: 1px solid var(--border); border-radius: .4rem; padding: 1.5rem; margin-top: 2rem; }
.agent-playground form { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem; }
.agent-playground select,.agent-playground button { font: inherit; padding: .65rem; border: 1px solid var(--border); border-radius: .25rem; background: var(--canvas); color: var(--text); max-width: 100%; }
.agent-task-preview { margin-top: 1.5rem; max-width: 65ch; }
.agent-task-preview blockquote { margin-inline: 0; padding: .8rem 1rem; border-left: 3px solid var(--accent); background: var(--surface-muted); }
.agent-execution-unavailable { color: var(--muted); font-size: .9rem; }
@media(max-width:560px) { .model-release-grid { grid-template-columns: 1fr; } .model-section-heading { align-items: flex-start; flex-direction: column; gap: .3rem; } }
html { background: var(--canvas); }
body { min-width: 0; margin: 0; color: var(--text); background: radial-gradient(circle at 100% -10%, rgba(136, 166, 122, .16), transparent 28rem), var(--canvas); font: 1rem/1.55 var(--sans); }
a { color: inherit; text-decoration-thickness: .08em; text-underline-offset: .16em; }
a:hover { color: var(--accent); }
button, input { font: inherit; }
button, input[type='search'] { min-height: 2.75rem; }
button { cursor: pointer; }
img { display: block; max-width: 100%; }

.skip-link { position: absolute; z-index: 10; left: 1rem; top: -4rem; padding: .6rem .9rem; color: var(--on-accent); background: var(--accent); border-radius: .25rem; }
.skip-link:focus { top: 1rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-header { border-bottom: 1px solid var(--rule); background: color-mix(in srgb, var(--surface) 93%, transparent); }
.header-bar, .topic-nav, .page-shell, .site-footer { width: min(100% - 2rem, 76rem); margin-inline: auto; }
.header-bar { display: grid; grid-template-columns: auto minmax(12rem, 31rem) auto; align-items: center; gap: 1rem; min-height: 5rem; }
.brand { display: inline-flex; align-items: baseline; gap: .15rem; color: var(--accent); text-decoration: none; font-family: var(--serif); font-size: 1.35rem; font-weight: 700; letter-spacing: -.04em; white-space: nowrap; }
.brand b { font-family: var(--sans); font-size: .9rem; letter-spacing: -.03em; }
.brand small { margin-left: .25rem; color: var(--muted); font-family: var(--sans); font-size: .68rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
.search-form { display: flex; justify-self: center; width: 100%; }
.search-form input { min-width: 0; flex: 1; padding: .55rem .75rem; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: .3rem 0 0 .3rem; }
.search-form button { padding: .55rem .85rem; color: var(--on-accent); background: var(--accent); border: 1px solid var(--accent); border-radius: 0 .3rem .3rem 0; font-weight: 700; }
.theme-toggle { justify-self: end; padding: .45rem .65rem; color: var(--text); background: transparent; border: 1px solid var(--border); border-radius: .3rem; font-size: .86rem; font-weight: 650; }
:root:not([data-js='true']) .theme-toggle { display: none; }
.theme-toggle:hover, .theme-toggle[aria-pressed='true'] { color: var(--on-accent); background: var(--accent); border-color: var(--accent); }
.topic-nav { display: flex; gap: .1rem; overflow-x: auto; padding: 0 0 .55rem; scrollbar-width: thin; }
.topic-nav a { flex: 0 0 auto; padding: .35rem .55rem; color: var(--muted); border-radius: .25rem; font-size: .88rem; font-weight: 650; text-decoration: none; }
.topic-nav a:hover, .topic-nav a[aria-current='page'] { color: var(--on-accent); background: var(--accent); }

.page-shell { padding-block: 2.6rem 4.5rem; }
.briefing-heading { display: flex; align-items: end; justify-content: space-between; gap: 2rem; padding-bottom: 1.45rem; border-bottom: 1px solid var(--rule); }
.eyebrow { margin: 0 0 .25rem; color: var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1, h2, h3 { color: var(--text); line-height: 1.12; }
h1, h2 { font-family: var(--serif); letter-spacing: -.035em; }
h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.4rem); }
h2 { margin: 0; font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { margin: 0; font: 700 1.08rem/1.25 var(--serif); letter-spacing: -.015em; }
.briefing-date { margin: 0 0 .25rem; color: var(--muted); font-size: .9rem; text-align: right; }
.briefing-layout { display: grid; grid-template-columns: minmax(0, 2fr) minmax(16rem, 1fr); gap: clamp(2.25rem, 5vw, 5rem); padding-top: 2rem; }
.news-column { min-width: 0; }

.lead-story { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(13rem, .88fr); gap: 1.8rem; padding-bottom: 2.5rem; border-bottom: 1px solid var(--rule); }
.lead-story-copy { align-self: start; }
.lead-story h2 { margin: .35rem 0 .8rem; font-size: clamp(1.8rem, 3.8vw, 3rem); }
.lead-story h2 a, .story-card h3 a, .latest-list h3 a { text-decoration: none; }
.lead-story h2 a:hover, .story-card h3 a:hover, .latest-list h3 a:hover { text-decoration: underline; }
.lead-summary { max-width: 52ch; margin: 0 0 1.1rem; color: var(--muted); font-size: 1.05rem; }
.lead-image { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: var(--surface-muted); border-radius: .45rem; box-shadow: var(--shadow); }
.topic-badge { color: var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .08em; text-decoration: none; text-transform: uppercase; }
.topic-badge:hover { text-decoration: underline; }
.story-meta, .source-meta { display: flex; flex-wrap: wrap; gap: .25rem .55rem; align-items: baseline; margin: .35rem 0 .8rem; color: var(--muted); font-size: .78rem; }
.story-meta > * + *::before, .source-meta > * + *::before { content: '·'; margin-right: .55rem; color: var(--border); }
.story-meta-compact { margin: .25rem 0 .65rem; font-size: .73rem; }
.content-kind { color: var(--accent); font-weight: 800; letter-spacing: .05em; text-transform: uppercase; }
.source-name, .byline { font-weight: 650; }
.timezone-label { font-size: .68rem; font-weight: 800; letter-spacing: .04em; }
.tag-list { display: flex; flex-wrap: wrap; gap: .35rem; padding: 0; margin: -.25rem 0 1rem; list-style: none; }
.tag-list li { padding: .16rem .45rem; color: var(--muted); background: var(--surface-muted); border-radius: 100vw; font-size: .72rem; font-weight: 650; }
.source-list { display: grid; gap: .72rem; padding: 0; margin: 0; list-style: none; }
.source-item { padding-left: .9rem; border-left: 2px solid var(--border); }
.source-item-primary { border-left-color: var(--accent); }
.source-item a, .source-item span { font-weight: 700; }
.source-meta { margin: .08rem 0 0; }
.source-details { margin-top: .9rem; color: var(--muted); font-size: .78rem; }
.source-details summary { width: fit-content; color: var(--accent); cursor: pointer; font-weight: 750; }
.source-details dl { display: grid; gap: .4rem; margin: .6rem 0 0; }
.source-details dl > div { display: grid; grid-template-columns: 5.25rem minmax(0, 1fr); gap: .5rem; }
.source-details dt { font-weight: 750; }
.source-details dd { display: flex; flex-wrap: wrap; gap: .2rem .4rem; min-width: 0; margin: 0; }
.read-story { display: inline-block; margin-top: 1.25rem; color: var(--accent); font-weight: 800; text-decoration: none; }
.read-story:hover { text-decoration: underline; }

.more-stories, .related-stories { padding-top: 2.5rem; }
.more-stories > h2, .related-stories > h2 { margin-bottom: 1.25rem; font-size: 1.65rem; }
.story-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.35rem; }
.story-card { display: flex; flex-direction: column; min-width: 0; background: var(--surface); border: 1px solid var(--rule); border-radius: .45rem; overflow: hidden; box-shadow: 0 5px 14px rgba(28, 45, 32, .04); }
.story-card-image { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: var(--surface-muted); }
.story-card-body { display: flex; flex: 1; flex-direction: column; padding: 1.15rem; }
.story-card h3 { margin: .35rem 0 .65rem; }
.story-summary { margin: 0 0 1rem; color: var(--muted); font-size: .9rem; }
.source-list-compact { gap: .48rem; margin-top: auto; }
.source-list-compact .source-item { padding-left: .65rem; font-size: .84rem; }
.story-card .source-details { margin-top: .8rem; }

.sidebar { display: grid; align-content: start; gap: 1.35rem; }
.sidebar-module { padding: 1.3rem; background: var(--surface); border: 1px solid var(--rule); border-radius: .45rem; }
.sidebar-module h2 { margin: 0 0 .7rem; font-size: 1.38rem; }
.sidebar-module > p:not(.eyebrow) { margin: 0; color: var(--muted); font-size: .92rem; }
.module-heading { display: flex; align-items: baseline; justify-content: space-between; gap: .75rem; margin-bottom: .75rem; }
.module-heading a { color: var(--accent); font-size: .82rem; font-weight: 700; }
.research-module { display: grid; gap: .85rem; }
.research-module .module-heading { margin: 0; }
.research-module .module-heading h2 { margin: 0; font-size: 1.38rem; }
.research-card-stack, .research-action-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .65rem; }
.research-card, .research-action { display: flex; flex-direction: column; min-width: 0; min-height: 10.5rem; padding: .8rem; color: var(--text); background: var(--surface); border: 1px solid var(--rule); border-radius: .45rem; box-shadow: 0 4px 12px rgba(28, 45, 32, .04); text-decoration: none; }
.research-card { justify-content: space-between; }
.research-card:hover, .research-action:hover { color: var(--text); border-color: var(--accent); box-shadow: var(--shadow); }
.research-thumbnail { width: 100%; height: 3.6rem; margin-bottom: .65rem; object-fit: cover; background: var(--surface-muted); border-radius: .25rem; }
.research-card-label, .research-action-label { margin: 0 0 .35rem; color: var(--accent); font-size: .66rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.research-card h3 { font-size: .98rem; }
.research-card h3 a { text-decoration: none; }
.research-card h3 a:hover { text-decoration: underline; }
.research-card-meta { display: flex; flex-wrap: wrap; gap: .2rem .4rem; margin: .7rem 0 0; color: var(--muted); font-size: .71rem; }
.research-card-meta > * + *::before { content: '·'; margin-right: .4rem; color: var(--border); }
.research-empty { grid-column: 1 / -1; margin: 0; padding: .9rem; color: var(--muted); background: var(--surface); border: 1px solid var(--rule); border-radius: .45rem; font-size: .83rem; }
.research-action { justify-content: space-between; min-height: 8.5rem; color: var(--text); background: linear-gradient(145deg, var(--surface), var(--surface-muted)); }
.research-action strong { color: var(--text); font: 700 1rem/1.15 var(--serif); }
.research-action > span:last-child { color: var(--muted); font-size: .75rem; line-height: 1.35; }
.topic-cloud { display: flex; flex-wrap: wrap; gap: .45rem; }
.topic-cloud a { padding: .35rem .55rem; color: var(--accent); border: 1px solid var(--border); border-radius: 100vw; font-size: .8rem; font-weight: 700; text-decoration: none; }
.topic-cloud a:hover { color: var(--on-accent); background: var(--accent); border-color: var(--accent); }
.empty-briefing { min-height: 23rem; padding: clamp(1.5rem, 5vw, 3.5rem); background: linear-gradient(135deg, var(--surface), color-mix(in srgb, var(--surface) 70%, var(--surface-muted))); border: 1px solid var(--rule); border-radius: .5rem; box-shadow: var(--shadow); }
.empty-briefing h1, .empty-briefing h2 { max-width: 18ch; margin: 0 0 .75rem; }
.empty-briefing > p:not(.eyebrow) { max-width: 57ch; margin: 0; color: var(--muted); }

.breadcrumb { display: flex; gap: .55rem; margin-bottom: 1.8rem; color: var(--muted); font-size: .9rem; }
.breadcrumb a { color: var(--accent); }
.story-detail { max-width: 52rem; }
.story-detail header { max-width: 47rem; margin-bottom: 1.6rem; }
.story-detail header h1 { margin-top: .35rem; }
.story-detail-date { margin: .8rem 0 0; color: var(--muted); }
.story-detail-image { width: 100%; aspect-ratio: 16 / 8; object-fit: cover; background: var(--surface-muted); border-radius: .45rem; box-shadow: var(--shadow); }
.story-detail-body { max-width: 42rem; padding-top: 1.8rem; }
.story-detail-summary { margin: 0 0 2.25rem; font: 1.2rem/1.65 var(--serif); }
.citations { padding-top: 1.35rem; border-top: 1px solid var(--rule); }
.citations h2 { margin-bottom: .5rem; font-size: 1.6rem; }
.citations > p { margin: 0 0 1.2rem; color: var(--muted); }
.story-detail header .story-meta { margin-top: .85rem; }
.story-detail-body > .source-details { margin-bottom: 1.8rem; }
.feed-health { padding: 0; overflow: hidden; }
.feed-health details > summary { padding: 1rem 1.3rem; cursor: pointer; color: var(--accent); font-size: .85rem; font-weight: 800; }
.feed-health ul { display: grid; gap: .7rem; padding: 0 1.3rem 1.25rem; margin: 0; list-style: none; }
.feed-health li { display: flex; flex-wrap: wrap; gap: .22rem .5rem; color: var(--muted); font-size: .76rem; }
.feed-health li > * + *::before { content: '·'; margin-right: .5rem; color: var(--border); }
.feed-health strong { color: var(--text); }
.feed-error { color: #9c331e; font-weight: 700; }
.site-footer { display: flex; justify-content: space-between; gap: 1rem; padding-block: 1.5rem 2rem; color: var(--muted); border-top: 1px solid var(--rule); font-size: .85rem; }
.site-footer p { margin: 0; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
@media (max-width: 760px) {
  .header-bar { grid-template-columns: 1fr auto; gap: .65rem; padding-block: .7rem; }
  .search-form { grid-column: 1 / -1; grid-row: 2; }
  .theme-toggle { grid-column: 2; grid-row: 1; }
  .briefing-heading { align-items: start; flex-direction: column; gap: .55rem; }
  .briefing-date { text-align: left; }
  .briefing-layout { grid-template-columns: 1fr; }
  .lead-story { grid-template-columns: 1fr; }
  .lead-image { order: -1; max-height: 22rem; }
}
@media (max-width: 520px) {
  .header-bar, .topic-nav, .page-shell, .site-footer { width: min(100% - 1.25rem, 76rem); }
  .page-shell { padding-block: 1.75rem 3rem; }
  .story-grid { grid-template-columns: 1fr; }
  .research-card-stack, .research-action-grid { grid-template-columns: 1fr; }
  .research-card, .research-action { min-height: auto; }
  .site-footer { display: block; }
  .site-footer p + p { margin-top: .25rem; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; } }

/* Research observatory: server-rendered content remains readable without this enhancement. */
.research-page { max-width: 58rem; }
.research-page > .sidebar-module { margin-top: 1.4rem; }
.research-page form { display: flex; flex-wrap: wrap; gap: .85rem 1.1rem; align-items: end; }
.research-page form > p { display: grid; gap: .25rem; margin: 0; color: var(--muted); font-size: .85rem; }
.research-page select, .research-page button { min-height: 2.5rem; padding: .45rem .65rem; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: .3rem; }
.research-page button { color: var(--on-accent); background: var(--accent); border-color: var(--accent); font-weight: 750; }
.research-page button:disabled, .research-page select:disabled { cursor: not-allowed; opacity: .6; }
.research-page #research-status, .research-page #freshness-result { min-height: 1.55em; }
.research-page #freshness-stories { margin-top: 1.1rem; }
.research-page #research-sources p { display: flex; flex-wrap: wrap; gap: .25rem .5rem; margin: .8rem 0 0; }
.research-page #research-sources p:first-child { margin-top: 0; }
.research-page .research-live-detail::before { content: '·'; margin-right: .5rem; color: var(--border); }
.research-page #research-cycles { max-height: 20rem; overflow: auto; }
.research-page pre { overflow: auto; padding: 1rem; color: var(--text); background: var(--surface-muted); border: 1px solid var(--border); border-radius: .35rem; font: .78rem/1.55 ui-monospace, SFMono-Regular, Consolas, monospace; white-space: pre-wrap; }
.research-page details { margin-top: 1rem; }
@media (max-width: 520px) {
  .research-page form { display: grid; grid-template-columns: 1fr; }
  .research-page form > p, .research-page form button { width: 100%; }
}