/* AI News Aggregate — visual system (T2)
   Calm editorial briefing sheet: off-white canvas, ink text, single cobalt
   accent, thin rules, static-first, mobile-first. */

/* ------------------------------------------------------------------ tokens */
:root {
  --canvas: #f7f8fa;
  --surface: #ffffff;
  --surface-subtle: #eef1f5;
  --ink: #17202b;
  --ink-muted: #536170;
  --rule: #d7dde5;
  --accent: #2457c5;
  --accent-strong: #173f9b;
  --focus: #b64200;
  --radius-sm: 8px;
  --radius-md: 12px;
  --content-max: 1180px;
  --space-unit: 4px;

  --font-sans: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #11161d;
    --surface: #18202a;
    --surface-subtle: #202a36;
    --ink: #f1f4f7;
    --ink-muted: #b8c2cd;
    --rule: #354250;
    --accent: #8eafff;
    --accent-strong: #b8cbff;
    --focus: #ffb36b;
  }
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--canvas);
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:visited { color: var(--accent-strong); }

h1, h2, h3, h4 { line-height: 1.1; margin: 0; font-weight: 700; letter-spacing: -0.01em; }
p { margin: 0; }
ul, ol, dl { margin: 0; padding: 0; }
li { list-style: none; }

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

/* ---------------------------------------------------------------- layout */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--surface);
  color: var(--ink);
  padding: 12px 16px;
  z-index: 100;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; top: 0; }

/* ----------------------------------------------------------------- header */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--canvas);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}
.wordmark {
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--ink);
  white-space: nowrap;
}
.wordmark:hover { text-decoration: none; color: var(--accent); }

.desktop-nav { margin-left: auto; }
.nav-menu { display: none; margin-left: auto; }
.nav-menu summary {
  display: none;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 15px;
  color: var(--ink);
  padding: 8px 4px;
  min-height: 44px;
  align-items: center;
}
.nav-menu summary::-webkit-details-marker { display: none; }

.site-nav { display: flex; gap: 20px; }
.site-nav a {
  color: var(--ink-muted);
  font-size: 16px;
  font-weight: 500;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ------------------------------------------------------------ edition bar */
.edition-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 14px;
  color: var(--ink-muted);
}
.edition-label {
  font-weight: 700;
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 12px;
}
.edition-date { font-weight: 500; }
.edition-lenses { color: var(--ink-muted); }
.rss-link {
  margin-left: auto;
  font-weight: 600;
  font-size: 13px;
  color: var(--accent);
}
.edition-notice {
  width: 100%;
  color: var(--ink-muted);
  font-style: italic;
  font-size: 13px;
}

/* ------------------------------------------------------------------ hero */
.hero {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 32px 40px;
  align-items: center;
  padding-top: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--rule);
}
.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 12px;
}
.hero-headline { font-size: 52px; line-height: 1.04; }
.hero-headline a { color: var(--ink); }
.hero-headline a:hover { color: var(--accent); text-decoration: none; }
.hero-dek {
  margin-top: 16px;
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-muted);
  max-width: 65ch;
}
.source-line {
  margin-top: 20px;
  font-size: 14px;
  color: var(--ink-muted);
}
.source-link { font-weight: 600; color: var(--accent); }
.source-unavailable { font-weight: 500; font-style: italic; color: var(--ink-muted); }
.stream-badges { margin-top: 12px; }
.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-muted);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 3px 10px;
  margin-right: 6px;
}
.read-story {
  display: inline-block;
  font-weight: 600;
  font-size: 15px;
  color: var(--accent);
}
.read-story-primary { margin-top: 20px; }

.hero-media {
  aspect-ratio: 16 / 10;
  background: var(--surface-subtle);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-media-fallback {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-muted);
  opacity: 0.6;
}

/* --------------------------------------------------------------- features */
.features { padding-top: 48px; padding-bottom: 48px; }
.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 32px 32px;
}
.feature {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
}
.feature-large {
  grid-column: span 7;
  grid-row: span 2;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  padding: 28px;
}
.feature-large .feature-headline { font-size: 32px; }
.feature-medium { grid-column: span 5; }
.feature-medium .feature-headline { font-size: 24px; }
.feature-small { grid-column: span 6; }
.feature-small .feature-headline { font-size: 20px; }

.cat-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 8px;
}
.feature-headline { line-height: 1.12; }
.feature-headline a { color: var(--ink); }
.feature-headline a:hover { color: var(--accent); text-decoration: none; }
.feature-dek {
  margin-top: 10px;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink-muted);
}
.feature-meta { margin-top: 12px; font-size: 13px; color: var(--ink-muted); }
.feature-actions {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ----------------------------------------------------------------- lenses */
.lenses {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding-top: 40px;
  padding-bottom: 40px;
  border-top: 1px solid var(--rule);
}
.lens {
  padding: 24px;
  background: var(--surface);
  border-radius: var(--radius-sm);
}
.lens-bp { border-left: 4px solid var(--accent); }
.lens-aia { border-left: 4px solid var(--ink-muted); }
.lens-title { font-size: 20px; margin-bottom: 8px; }
.lens-theme {
  font-size: 14px;
  color: var(--ink-muted);
  line-height: 1.5;
  margin-bottom: 16px;
}
.lens-list { display: flex; flex-direction: column; gap: 10px; }
.lens-list a { color: var(--ink); font-weight: 500; font-size: 15px; }
.lens-list a:hover { color: var(--accent); }
.lens-also { font-size: 12px; color: var(--ink-muted); }
.lens-empty { font-size: 14px; color: var(--ink-muted); font-style: italic; }

/* ----------------------------------------------------------------- lesser */
.lesser { padding-top: 40px; padding-bottom: 24px; border-top: 1px solid var(--rule); }
.lesser-list { display: flex; flex-direction: column; }
.lesser-item {
  display: flex;
  gap: 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
}
.lesser-item:last-child { border-bottom: 0; }
.lesser-main { flex: 1; min-width: 0; }
.lesser-cat {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
}
.lesser-headline { margin-top: 4px; font-size: 18px; line-height: 1.2; }
.lesser-headline a { color: var(--ink); }
.lesser-headline a:hover { color: var(--accent); text-decoration: none; }
.lesser-takeaway { margin-top: 4px; font-size: 14px; color: var(--ink-muted); line-height: 1.45; }
.lesser-meta { margin-top: 6px; font-size: 13px; color: var(--ink-muted); }
.lesser-link { align-self: center; white-space: nowrap; font-size: 14px; }

/* -------------------------------------------------------------- archive */
.page-title { font-size: 40px; letter-spacing: -0.015em; margin: 48px 0 8px; }
.page-lede { color: var(--ink-muted); font-size: 17px; margin-bottom: 32px; max-width: 65ch; }
.month-group { margin-bottom: 40px; }
.month-group .section-title { font-size: 20px; color: var(--ink-muted); }
.archive-list { display: flex; flex-direction: column; }
.edition-row { padding: 16px 0; border-bottom: 1px solid var(--rule); }
.edition-date-link { font-weight: 600; color: var(--ink); font-size: 16px; }
.edition-date-link:hover { color: var(--accent); }
.edition-lead { margin-top: 4px; font-size: 15px; color: var(--ink-muted); }
.edition-tags { margin-top: 4px; font-size: 13px; color: var(--ink-muted); }

.prev-next {
  display: flex;
  gap: 20px;
  padding-top: 24px;
  padding-bottom: 24px;
}
.pn-link { font-weight: 600; font-size: 15px; }

/* ----------------------------------------------------------------- topics */
.topic-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.topic-card {
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  padding: 20px;
  background: var(--surface);
}
.topic-card-link { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.topic-name { font-weight: 700; font-size: 18px; color: var(--ink); }
.topic-card-link:hover .topic-name { color: var(--accent); text-decoration: underline; }
.topic-count { font-size: 13px; color: var(--ink-muted); white-space: nowrap; }
.topic-def { margin-top: 8px; font-size: 14px; color: var(--ink-muted); line-height: 1.5; }

/* ------------------------------------------------------------------ story */
.breadcrumb {
  padding: 20px 0 0;
  font-size: 13px;
  color: var(--ink-muted);
}
.breadcrumb a { color: var(--ink-muted); }
.breadcrumb a:hover { color: var(--accent); }
.story { padding: 24px 0 40px; max-width: 65ch; }
.story-header { padding-bottom: 32px; border-bottom: 1px solid var(--rule); }
.story-headline { font-size: 56px; line-height: 1.05; letter-spacing: -0.015em; }
.story-dek {
  margin-top: 18px;
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-muted);
}
.story-meta {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 8px 16px;
  font-size: 14px;
}
.story-meta dt { color: var(--ink-muted); font-weight: 600; }
.story-meta dd { margin: 0; color: var(--ink); }

.takeaway { padding: 32px 0; border-bottom: 1px solid var(--rule); }
.takeaway p { font-size: 17px; line-height: 1.6; }

.source-block {
  margin-top: 32px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
}
.source-rows {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 8px 16px;
  font-size: 14px;
}
.source-rows dt { color: var(--ink-muted); font-weight: 600; }
.source-rows dd { margin: 0; }
.source-action { margin-top: 16px; }

.provenance-note { margin-top: 20px; font-size: 13px; color: var(--ink-muted); font-style: italic; }

.related { padding-top: 40px; padding-bottom: 40px; border-top: 1px solid var(--rule); }
.related-list { display: flex; flex-direction: column; gap: 12px; }
.related-list a { color: var(--ink); font-weight: 500; }
.related-list a:hover { color: var(--accent); }
.related-meta { display: block; font-size: 13px; color: var(--ink-muted); }

/* ------------------------------------------------------------------ prose */
.prose { max-width: 65ch; padding-top: 24px; padding-bottom: 48px; }
.prose .page-title { margin-top: 0; }
.prose p { margin-bottom: 16px; line-height: 1.6; }
.prose ul { list-style: disc; padding-left: 24px; margin-bottom: 16px; }
.prose li { list-style: disc; margin-bottom: 6px; }
.prose .section-title { margin: 32px 0 12px; }

/* ---------------------------------------------------------------- footer */
.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 48px;
  padding: 40px 0 32px;
  background: var(--surface-subtle);
}
.footer-inner { display: flex; flex-direction: column; gap: 16px; }
.footer-actions { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-actions a { font-weight: 600; font-size: 15px; }
.footer-note { font-size: 14px; color: var(--ink-muted); max-width: 65ch; line-height: 1.5; }
.footer-copy { font-size: 13px; color: var(--ink-muted); }

/* ------------------------------------------------------------ empty state */
.empty-state {
  padding: 64px 0;
  text-align: center;
  color: var(--ink-muted);
}
.empty-state h1 { font-size: 28px; color: var(--ink); margin-bottom: 12px; }
.empty-state p { font-size: 16px; }

/* -------------------------------------------------------------- responsive */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 24px; }
  .feature-large { grid-column: span 12; grid-row: auto; }
  .feature-medium { grid-column: span 12; }
  .feature-small { grid-column: span 12; }
  .lenses { grid-template-columns: 1fr; }
  .topic-list { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .container { padding-left: 16px; padding-right: 16px; }
  .header-inner { height: 56px; }
  .hero { padding-top: 32px; padding-bottom: 32px; }
  .features { padding-top: 32px; padding-bottom: 32px; }
  .lenses { padding-top: 32px; padding-bottom: 32px; }
  .lesser { padding-top: 32px; padding-bottom: 24px; }
  .hero-headline { font-size: 36px; }
  .story-headline { font-size: 38px; }
  .section-title { font-size: 22px; }
  .hero-dek { font-size: 17px; }
  .lesser-item { flex-direction: column; gap: 8px; }
  .lesser-link { align-self: flex-start; }
  .story-meta { grid-template-columns: 1fr; gap: 2px; }
  .story-meta dd { margin-bottom: 8px; }
  .source-rows { grid-template-columns: 1fr; gap: 2px; }
  .source-rows dd { margin-bottom: 8px; }
}

/* --------------------------------------------------------- mobile nav */
@media (max-width: 720px) {
  .desktop-nav { display: none; }
  .nav-menu { display: block; }
  .nav-menu summary { display: flex; }
  .site-nav {
    display: none;
    position: absolute;
    right: 16px;
    top: 56px;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--rule);
    border-radius: var(--radius-sm);
    padding: 8px 0;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    min-width: 160px;
    gap: 0;
  }
  .nav-menu[open] .site-nav { display: flex; }
  .site-nav a { padding: 10px 20px; }
}

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