/* Server-rendered public pages: /news, /news/:slug, /learn, /learn/:slug
   (server/seo.js). Standalone on purpose: these pages are what a search
   result lands on, so they load one small stylesheet and no scripts.
   Light and dark follow the same `theme` choice as Buzz and the app. */

:root {
  --bg: #F6F8F9;
  --surface: #FFFFFF;
  --surface-2: #EEF3F4;
  --border: #DCE4E6;
  --text: #0F1C1F;
  --text-dim: #44585D;
  --text-faint: #66787C;
  --accent: #0E7C86;
  --accent-text: #0A6169;
  --accent-soft: #E1F3F4;
  --on-accent: #FFFFFF;
  --shadow: 0 1px 2px rgba(15, 28, 31, .06), 0 6px 18px rgba(15, 28, 31, .06);
  --cat-models: #6D4AFF; --cat-tools: #2563EB; --cat-cloud: #0284C7; --cat-open: #16A34A;
  --cat-research: #D97706; --cat-policy: #E11D48; --cat-business: #0E7C86; --cat-deal: #059669;
  --cat-community: #EA580C; --cat-news: #475569;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0B1416; --surface: #111D20; --surface-2: #17272B; --border: #24373C;
    --text: #E6F0F1; --text-dim: #A9BDC1; --text-faint: #8AA0A5;
    --accent: #2BB3BE; --accent-text: #6FD6DE; --accent-soft: #123237; --on-accent: #06181A;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
    --cat-models: #8B5CF6; --cat-tools: #3B82F6; --cat-cloud: #0EA5E9; --cat-open: #22C55E;
    --cat-research: #F59E0B; --cat-policy: #F43F5E; --cat-business: #14B8A6; --cat-deal: #10B981;
    --cat-community: #F97316; --cat-news: #64748B;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0B1416; --surface: #111D20; --surface-2: #17272B; --border: #24373C;
  --text: #E6F0F1; --text-dim: #A9BDC1; --text-faint: #8AA0A5;
  --accent: #2BB3BE; --accent-text: #6FD6DE; --accent-soft: #123237; --on-accent: #06181A;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
  --cat-models: #8B5CF6; --cat-tools: #3B82F6; --cat-cloud: #0EA5E9; --cat-open: #22C55E;
  --cat-research: #F59E0B; --cat-policy: #F43F5E; --cat-business: #14B8A6; --cat-deal: #10B981;
  --cat-community: #F97316; --cat-news: #64748B;
  color-scheme: dark;
}

.s-cat-models { --cat: var(--cat-models); }
.s-cat-tools { --cat: var(--cat-tools); }
.s-cat-cloud { --cat: var(--cat-cloud); }
.s-cat-open-source { --cat: var(--cat-open); }
.s-cat-research { --cat: var(--cat-research); }
.s-cat-policy { --cat: var(--cat-policy); }
.s-cat-business { --cat: var(--cat-business); }
.s-cat-deal { --cat: var(--cat-deal); }
.s-cat-community { --cat: var(--cat-community); }
.s-cat-news { --cat: var(--cat-news); }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent-text); text-underline-offset: 2px; }
a:focus-visible, .s-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
img { max-width: 100%; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.015em; text-wrap: balance; }

.s-wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.s-skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.s-skip:focus { left: 8px; }

/* header */
.s-top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--surface) 88%, transparent); backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--border); }
.s-top-in { display: flex; align-items: center; gap: 16px; min-height: 60px; }
.s-brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; color: var(--text); text-decoration: none; white-space: nowrap; }
.s-mark { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; background: var(--accent); color: var(--on-accent); }
.s-nav { display: flex; gap: 2px; flex: 1; overflow-x: auto; scrollbar-width: none; }
.s-nav a { padding: 8px 12px; border-radius: 999px; color: var(--text-dim); text-decoration: none; font-weight: 600; font-size: 14.5px; white-space: nowrap; }
.s-nav a:hover { background: var(--surface-2); color: var(--text); }
.s-nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent-text); }

.s-btn { display: inline-flex; align-items: center; gap: 6px; min-height: 42px; padding: 9px 16px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface); color: var(--text); font-weight: 650; font-size: 15px; text-decoration: none; }
.s-btn:hover { background: var(--surface-2); }
.s-btn-primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.s-btn-primary:hover { background: var(--accent); filter: brightness(1.07); }
.s-top-cta { white-space: nowrap; }

.s-main { padding-top: 20px; padding-bottom: 56px; }

.s-crumbs ol { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0 0 18px; padding: 0; font-size: 13.5px; color: var(--text-faint); }
.s-crumbs li + li::before { content: '›'; margin-right: 6px; }
.s-crumbs a { color: var(--text-dim); text-decoration: none; }
.s-crumbs a:hover { text-decoration: underline; }

.s-head { padding: 12px 0 8px; }
.s-head h1 { font-size: clamp(30px, 4.6vw, 46px); margin: 0 0 10px; }
.s-lede { font-size: 18px; color: var(--text-dim); max-width: 70ch; margin: 0 0 14px; }
.s-head-actions, .s-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; }

.s-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 22px; }
.s-chips a { padding: 6px 13px; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); color: var(--text-dim); text-decoration: none; font-weight: 600; font-size: 14px; }
.s-chips a:hover, .s-chips a[aria-current="page"] { border-color: var(--accent); color: var(--accent-text); background: var(--accent-soft); }

/* cards */
.s-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 18px; }
.s-grid-sm { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.s-card { display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--border); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); }
.s-card-media { position: relative; display: block; aspect-ratio: 16 / 9; background: color-mix(in srgb, var(--cat, var(--accent)) 16%, var(--surface-2)); overflow: hidden; }
.s-card-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.s-cover { position: absolute; inset: 0; display: grid; place-items: center; font-size: 26px; font-weight: 800; letter-spacing: -.02em; color: var(--cat, var(--accent));
  background: radial-gradient(120% 100% at 100% 0%, color-mix(in srgb, var(--cat, var(--accent)) 30%, transparent), transparent 60%), color-mix(in srgb, var(--cat, var(--accent)) 10%, var(--surface-2)); }
.s-play { position: absolute; left: 50%; top: 50%; width: 58px; height: 40px; margin: -20px 0 0 -29px; border-radius: 12px; background: rgba(0, 0, 0, .7); }
.s-play::after { content: ''; position: absolute; left: 24px; top: 12px; border-style: solid; border-width: 8px 0 8px 13px; border-color: transparent transparent transparent #fff; }
.s-card-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.s-kicker { margin: 0; font-size: 13px; color: var(--text-faint); font-weight: 600; }
.s-kicker a { color: var(--cat, var(--accent-text)); text-decoration: none; font-weight: 750; }
.s-card .s-kicker a { color: color-mix(in srgb, var(--cat, var(--accent)) 80%, var(--text)); }
.s-card-title { margin: 0; font-size: 18.5px; }
.s-card-title a { color: var(--text); text-decoration: none; }
.s-card-title a:hover { color: var(--accent-text); text-decoration: underline; }
.s-card-sum { margin: 0; color: var(--text-dim); font-size: 15px; }
.s-source { margin: auto 0 0; padding-top: 6px; font-size: 13px; color: var(--text-faint); }

.s-pager { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin: 26px 0; color: var(--text-dim); font-size: 14px; }

/* article */
.s-article { max-width: 780px; }
.s-article h1 { font-size: clamp(28px, 4.2vw, 42px); margin: 6px 0 12px; }
.s-article .s-kicker { font-size: 14px; }
.s-article .s-kicker a { color: color-mix(in srgb, var(--cat, var(--accent)) 80%, var(--text)); }
.s-media { margin: 18px 0; }
.s-media img { width: 100%; height: auto; aspect-ratio: 1200 / 630; object-fit: cover; border-radius: 16px; border: 1px solid var(--border); background: var(--surface-2); }
.s-video iframe { width: 100%; aspect-ratio: 16 / 9; border: 0; border-radius: 16px; background: #000; }
.s-media figcaption { margin-top: 6px; font-size: 13px; color: var(--text-faint); }
.s-prose { font-size: 17.5px; line-height: 1.7; }
.s-prose p { margin: 0 0 1em; }
.s-deal { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 10px; margin: 18px 0; padding: 0; }
.s-deal div { padding: 12px 14px; border-radius: 12px; background: var(--surface); border: 1px solid var(--border); }
.s-deal dt { font-size: 12.5px; text-transform: uppercase; letter-spacing: .06em; color: var(--text-faint); font-weight: 700; }
.s-deal dd { margin: 4px 0 0; font-weight: 650; }
.s-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.s-tags a { font-size: 14px; color: var(--text-dim); text-decoration: none; padding: 4px 10px; border-radius: 999px; background: var(--surface-2); }
.s-tags a:hover { color: var(--accent-text); }

.s-facts { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 4px 0 8px; }
.s-facts li { padding: 6px 12px; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); font-size: 14px; color: var(--text-dim); }
.s-facts strong { color: var(--text); }
.s-cap { text-transform: capitalize; }
.s-concepts { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; list-style: none; padding: 0; }
.s-concepts li { position: relative; padding: 10px 12px 10px 34px; border-radius: 12px; background: var(--surface); border: 1px solid var(--border); }
.s-concepts li::before { content: ''; position: absolute; left: 13px; top: 17px; width: 9px; height: 9px; border-radius: 3px; transform: rotate(45deg); background: var(--accent); }

.s-related { margin-top: 36px; }
.s-related h2, .s-cat h2 { font-size: 24px; margin: 0 0 12px; }
.s-lessons { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 10px; list-style: none; padding: 0; margin: 0; }
.s-lessons a { display: flex; flex-direction: column; gap: 4px; height: 100%; padding: 14px 16px; border-radius: 14px; background: var(--surface); border: 1px solid var(--border); color: var(--text); text-decoration: none; }
.s-lessons a:hover { border-color: var(--accent); }
.s-lessons strong { font-size: 16px; }
.s-lessons span { font-size: 14px; color: var(--text-dim); }
.s-lessons em { font-style: normal; font-size: 13px; color: var(--text-faint); text-transform: capitalize; }
.s-cat { margin-top: 34px; }
.s-cat > p { color: var(--text-dim); margin: 0 0 14px; max-width: 75ch; }

.s-tracks { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; list-style: none; padding: 0; }
.s-track { padding: 18px; border-radius: 16px; background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow); }
.s-track h3 { margin: 0 0 4px; font-size: 19px; }
.s-track p { margin: 0 0 8px; color: var(--text-dim); font-size: 14.5px; }
.s-track .s-track-tag { color: var(--accent-text); font-weight: 650; }
.s-meta { font-size: 13px !important; color: var(--text-faint) !important; }
.s-levels ul { padding-left: 20px; color: var(--text-dim); }
.s-levels li { margin: 6px 0; }
.s-levels strong { color: var(--text); }

.s-promo { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; margin-top: 40px; padding: 22px 24px; border-radius: 18px; color: var(--text);
  background: radial-gradient(120% 140% at 100% 0%, color-mix(in srgb, var(--accent) 28%, transparent), transparent 60%), var(--surface); border: 1px solid var(--border); }
.s-promo h2 { margin: 0 0 4px; font-size: 22px; }
.s-promo p { margin: 0; color: var(--text-dim); max-width: 62ch; }

.s-empty { padding: 40px 0; text-align: left; }

/* footer */
.s-foot { border-top: 1px solid var(--border); background: var(--surface); padding: 22px 0 30px; font-size: 14px; color: var(--text-faint); }
.s-foot nav { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 10px; }
.s-foot a { color: var(--text-dim); text-decoration: none; }
.s-foot a:hover { color: var(--accent-text); text-decoration: underline; }

@media (max-width: 720px) {
  .s-top-in { flex-wrap: wrap; gap: 8px 12px; padding-top: 8px; padding-bottom: 8px; }
  .s-nav { order: 3; flex-basis: 100%; }
  .s-top-cta { margin-left: auto; min-height: 36px; padding: 6px 12px; font-size: 14px; }
  .s-lede { font-size: 16.5px; }
  .s-prose { font-size: 16.5px; }
  .s-grid { grid-template-columns: 1fr; }
}