/* The sister site's own font request (preview.tedt.org css/shared-fonts.css) */
@import url('https://fonts.googleapis.com/css2?family=Cal+Sans&family=Fira+Code:wght@300;400;500;600;700&family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=Titillium+Web:ital,wght@0,200..900;1,200..700&display=swap');

/* ============================================================
   Yesterday in AI — component and base styles
   Load after tokens.css (and after Bootstrap 5.3 if you use it):
     <link rel="stylesheet" href="tokens.css">
     <link rel="stylesheet" href="yia.css">
   Themes: set data-theme="light" | "dark" on <html>.
   Every value comes from tokens.css; never paste raw values.
   ============================================================ */

/* ---------- Web fonts ----------
   Shared with the sister site preview.tedt.org (Public Workbench):
   Cal Sans      — display and every heading, weight 400 (Titillium Web as fallback)
   Inter         — body, UI, eyebrows, status pills; 400 for text and buttons,
                   600 for eyebrows, status and standalone links
   Fira Code     — dates, section numbers, meta, code
*/

/* ============================================================
   LIGHT THEME (default)
   ============================================================ */
:root,
[data-bs-theme="light"] {
  --bs-body-font-family: var(--font-sans);
  --bs-body-font-size: var(--fs-18);
  --bs-body-line-height: var(--lh-body);
}

/* ============================================================
   DARK THEME
   ============================================================ */
[data-bs-theme="dark"] {
  --bs-primary-rgb: 232, 96, 39;
}

/* ============================================================
   GLOBAL TOKENS (theme-independent)
   ============================================================ */
:root {
  /* Motion. The page has no motion family, so these values live here. */
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-1: 120ms;
  --dur-2: 200ms;
  --dur-3: 320ms;
}

/* ============================================================
   BASE
   ============================================================ */
html, body {
  background: var(--bg);
  color: var(--fg-body);
  font-family: var(--font-sans);
  font-size: var(--fs-18);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: var(--bs-btn-color); }

/* ============================================================
   SEMANTIC TYPOGRAPHY
   ============================================================ */
/* Eyebrow — sentence case, never all caps */
.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.77rem;
  font-weight: 600;
  letter-spacing: var(--tr-eyebrow);
  line-height: 1.65;
  color: var(--fg-muted);
}
.meta {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  font-weight: 400;
  line-height: 1.65;
  color: var(--fg-muted);
}
/* Status pill — the site's .ia-status */
.status {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.5;
  white-space: nowrap;
  color: var(--fg);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
}
/* Standalone link with an arrow — the site's .ia-text-link */
.text-link { font-weight: 600; }
/* Section / item numbers — mono in the accent */
.number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-hover);
}

/* Display and headings — Cal Sans 400 */
.display, .h1, h1, .h2, h2, .h3, h3, .h4, h4, .h5, h5 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: var(--tr-tight);
  line-height: var(--lh-tight);
  color: var(--fg);
  text-wrap: balance;
}
.display, .h1, h1 { font-size: clamp(2.75rem, 5.8vw, 5.6rem); letter-spacing: var(--tr-display); }
.display-xl { font-family: var(--font-display); font-size: clamp(64px, 11vw, 160px); font-weight: 400; line-height: 0.95; letter-spacing: var(--tr-display); }
.h2, h2 { font-size: clamp(1.7rem, 2.3vw, 2.45rem); }
.h3, h3 { font-size: 1.3rem; }
.title-row { font-family: var(--font-display); font-weight: 400; font-size: 1.35rem; line-height: var(--lh-tight); letter-spacing: var(--tr-tight); color: var(--fg); }
.h4, h4 { font-size: 1.15rem; line-height: var(--lh-normal); }
.h5, h5 { font-size: var(--fs-16); line-height: var(--lh-normal); }

/* Lede / prose */
.lede {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: clamp(1.08rem, 1.6vw, 1.35rem);
  line-height: var(--lh-prose);
  max-width: var(--measure);
  color: var(--fg-muted);
  text-wrap: pretty;
}
.p, p {
  font-family: var(--font-sans);
  font-size: var(--fs-18);
  line-height: var(--lh-body);
  color: var(--fg-body);
  text-wrap: pretty;
}
.prose {
  font-family: var(--font-sans);
  font-size: var(--fs-18);
  line-height: var(--lh-body);
  max-width: var(--w-prose);
  color: var(--fg-body);
}
.prose p + p { margin-top: var(--sp-5); }

.small { font-size: 0.88rem; line-height: 1.65; color: var(--fg-muted); }
.body-sm { font-size: 0.95rem; line-height: 1.65; color: var(--fg-muted); }
.caption { font-size: 0.82rem; line-height: 1.65; color: var(--fg-muted); }

.code, code, pre {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
}
:not(pre) > code {
  background: var(--bg-subtle);
  padding: 0.1em 0.35em;
  border-radius: var(--r-1);
  color: var(--fg);
  border: 1px solid var(--border-soft);
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
  transition: color var(--dur-1) var(--ease), text-decoration-thickness var(--dur-1) var(--ease);
}
a:hover { color: var(--accent-hover); text-decoration-thickness: 3px; }

/* Focus — always visible, 3px at a 4px offset */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, .btn:focus-visible {
  outline: var(--focus-width) solid var(--accent);
  outline-offset: 4px;
  box-shadow: none;
}
.navbar a:focus-visible, .navbar button:focus-visible { outline-color: var(--nav-ink); }

/* Page container — matches the sister site's .ia-container */
.yia-container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}

/* Hairline-opened section */
.yia-section { border-top: 1px solid var(--border); padding-block: 3rem; }
a:active { color: var(--accent-press); }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: var(--sp-8) 0;
  opacity: 1;
}

/* ============================================================
   BRAND PRIMITIVES
   ============================================================ */
.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.3ch;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.75rem;
  line-height: 1;
  letter-spacing: var(--tr-tight);
  color: var(--fg);
  text-decoration: none;
}
.wordmark:hover { color: var(--fg); text-decoration: none; }
.navbar .wordmark, .navbar .wordmark:hover { color: var(--nav-ink); }
.wordmark .wm-cadence { color: inherit; }
.wordmark .wm-slash { color: var(--accent); margin: 0 0.05ch; }
.wordmark .wm-tail { color: inherit; }
/* The logo reads "YesterdAI": <a class="wordmark" aria-label="Yesterday in AI">Yesterd<span class="wm-ai">AI</span></a> */
.wordmark .wm-ai { color: var(--accent); }
.wordmark:has(.wm-ai) { gap: 0; } /* YesterdAI is one word: no gap before "AI" */

/* Section tag — dot + label, set like the site's status pills */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--fg);
}
.tag::before {
  content: "";
  width: 0.55em; height: 0.55em;
  background: var(--tag-color, var(--fg-muted));
  border-radius: var(--r-pill);
  flex: none;
}
.tag-bigmoves  { }
.tag-ops       { --tag-color: var(--tag-ops); }
.tag-vendors   { --tag-color: var(--tag-vendors); }
.tag-security  { --tag-color: var(--tag-security); }
.tag-policy    { --tag-color: var(--tag-policy); }
.tag-quick     { --tag-color: var(--tag-quick); }

/* Section header w/ strong rule */
.section-header {
  border-top: 2px solid var(--border-strong);
  padding-top: var(--sp-4);
  margin-top: var(--sp-12);
  margin-bottom: var(--sp-6);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
}
.section-header .lede { color: var(--fg-muted); font-size: 0.95rem; }

/* Hairline rule between feed items */
.feed-item {
  border-bottom: 1px solid var(--border-soft);
  padding: var(--sp-5) 0;
}
.feed-item:last-child { border-bottom: 0; }

/* Cluster of related links under a lead headline (Techmeme-style) */
.cluster {
  list-style: none;
  margin: var(--sp-2) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-1);
}
.cluster li {
  display: flex;
  gap: var(--sp-2);
  align-items: baseline;
  font-size: 0.9rem;
  line-height: 1.65;
}
.cluster li::before {
  content: "›";
  font-family: var(--font-mono);
  color: var(--fg-faint);
  flex: none;
  width: 0.9em;
}
.cluster .src {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  color: var(--fg-muted);
}

/* ============================================================
   BOOTSTRAP COMPONENT REFINEMENTS
   ============================================================ */
.btn {
  font-family: var(--font-sans);
  font-size: var(--fs-18);
  font-weight: 400;
  line-height: 1.6;
  padding: 0.75rem 1.25rem;
  min-height: var(--target-min);
  border-radius: var(--r-2);
  transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
}
.btn:hover { filter: brightness(0.9); }
.btn:active { transform: translateY(1px); }
.btn-primary {
}
.btn-dark, .btn-outline-dark {
  --bs-btn-color: var(--fg);
  --bs-btn-border-color: var(--border-strong);
  --bs-btn-hover-bg: var(--ink-900);
  --bs-btn-hover-color: var(--fg-on-dark);
}

/* Navbar — ink in both themes, as on the sister site */
.navbar {
  background: var(--nav-bg) !important;
  color: var(--nav-ink);
  min-height: var(--nav-height);
  border-bottom: 0;
}
.navbar .nav-link {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 15px;
  min-height: var(--target-min);
  display: flex;
  align-items: center;
  color: var(--nav-ink);
}
.navbar .nav-link:hover { color: var(--nav-ink); text-decoration: underline; text-decoration-thickness: 3px; }
.navbar .nav-link.active { color: var(--nav-ink); text-decoration: underline; }

.dropdown-menu {
  border-radius: var(--r-2);
  border-color: var(--border);
  box-shadow: var(--shadow-pop);
  font-size: 0.9rem;
  background: var(--bg-elev);
}
.dropdown-item { color: var(--fg-body); }
.dropdown-item:hover, .dropdown-item:focus { background: var(--bg-subtle); color: var(--fg); }

.form-control, .form-select {
  background: var(--bg-elev);
  border-color: var(--border-control);
  color: var(--fg);
  min-height: var(--field-min);
  font-size: var(--fs-16);
  border-radius: var(--r-2);
}
.form-control:focus, .form-select:focus { border-color: var(--accent); }

.badge { font-family: var(--font-sans); font-size: 0.7rem; font-weight: 600; line-height: 1.5; }

/* Card override — bordered, no shadow by default */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  box-shadow: none;
}
.card:hover { border-color: var(--border-control); }

/* Pull quote */
.pullquote {
  margin: var(--sp-10) 0;
  padding: var(--sp-6) 0 var(--sp-6) var(--sp-6);
  border-left: 3px solid var(--accent);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.75rem, 3.5vw, 2.45rem);
  line-height: var(--lh-tight);
  letter-spacing: var(--tr-tight);
  color: var(--fg);
  text-wrap: balance;
}
.pullquote cite {
  display: block;
  margin-top: var(--sp-3);
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.83rem;
  color: var(--fg-muted);
}

/* Editorial table */
table.editorial {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: var(--sp-6) 0;
}
table.editorial th, table.editorial td {
  padding: var(--sp-3) var(--sp-4);
  text-align: left;
  border-bottom: 1px solid var(--border-soft);
  vertical-align: top;
}
table.editorial thead th {
  font-family: var(--font-sans);
  font-size: 0.77rem;
  letter-spacing: var(--tr-eyebrow);
  color: var(--fg-muted);
  font-weight: 600;
  border-bottom: 2px solid var(--border-strong);
}
table.editorial tbody tr:hover { background: var(--bg-subtle); }
table.editorial td .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--fg);
}

/* Skeleton loader */
@keyframes skeleton-shimmer {
  0% { background-position: -200px 0; }
  100% { background-position: calc(200px + 100%) 0; }
}
.skeleton {
  display: inline-block;
  height: 1em;
  border-radius: var(--r-1);
  background: linear-gradient(90deg, var(--bg-subtle) 0%, var(--ink-100) 50%, var(--bg-subtle) 100%);
  background-size: 200px 100%;
  background-repeat: no-repeat;
  animation: skeleton-shimmer 1.4s linear infinite;
}
.skeleton-line { width: 100%; height: 0.9em; margin: 0.4em 0; }
.skeleton-title { height: 1.6em; width: 80%; margin-bottom: 0.6em; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}

/* ============================================================
   UTILITIES (Bootstrap-compatible naming, brand tokens)
   ============================================================ */
.bg-paper    { background-color: var(--bg) !important; }
.bg-elev     { background-color: var(--bg-elev) !important; }
.bg-subtle   { background-color: var(--bg-subtle) !important; }
.bg-rail     { background-color: var(--bg-rail) !important; }
.bg-inverse  { background-color: var(--bg-inverse) !important; color: var(--fg-on-dark) !important; }

.text-fg          { color: var(--fg) !important; }
.text-body-em     { color: var(--fg-body) !important; }
.text-muted-em    { color: var(--fg-muted) !important; }
.text-faint       { color: var(--fg-faint) !important; }
.text-accent      { color: var(--accent) !important; }

.border-soft       { border-color: var(--border-soft) !important; }
.border-strong     { border-color: var(--border-strong) !important; }
.rule-strong       { border-top: 2px solid var(--border-strong); }

.font-display  { font-family: var(--font-display) !important; }
.font-headline { font-family: var(--font-headline) !important; }
.font-sans     { font-family: var(--font-sans) !important; }
.font-mono     { font-family: var(--font-mono) !important; }