/* AI Edge — Warm Authority, dark variant
   Palette: Deep Sea #061B30, Harbour #0D2844, Pearl #F3F0EB, Fog #9CA3AF,
            Burnished Gold #D4A853, Soft Violet #635BFF, Indigo Night #1A3A5C */

:root {
  --bg: #061B30;
  --surface: #0D2844;
  --surface-elev: #13304F;
  --text: #F3F0EB;
  --text-dim: #9CA3AF;
  --text-muted: #6B7E95;
  --gold: #D4A853;
  --gold-dim: #9C7B3B;
  --violet: #7A72FF;
  --border: #1A3A5C;
  --border-soft: rgba(26, 58, 92, 0.5);

  --tier-1: #D4A853;
  --tier-2: #7A72FF;
  --tier-3: #5BA8C4;
  --tier-4: #E07B5B;
  --pay-attention: #E07B5B;

  --font-serif: "Instrument Serif", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;

  --measure: 38rem;
  --radius: 4px;
}

* { box-sizing: border-box; }
*::selection { background: var(--gold); color: var(--bg); }

html {
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: -0.005em;
}

.page {
  max-width: calc(var(--measure) + 3rem);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 6rem;
}
@media (min-width: 640px) {
  .page { padding: 4rem 2rem 8rem; }
  body { font-size: 18px; }
}

/* ————— Masthead ————— */
.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-soft);
}
.masthead a {
  text-decoration: none;
  color: inherit;
}
.masthead-wordmark {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  line-height: 1;
}
.masthead-wordmark em {
  color: var(--gold);
  font-style: italic;
}
.masthead-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* ————— Brief header ————— */
.brief-header {
  margin-bottom: 3.5rem;
}
.brief-kicker {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.25rem;
  font-weight: 500;
}
.brief-date {
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 5.5vw, 3.25rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0 0 0.9rem;
  color: var(--text);
  font-weight: 400;
}
.brief-date .year {
  color: var(--text-muted);
}
.brief-meta {
  display: flex;
  gap: 1.25rem;
  font-size: 0.8125rem;
  color: var(--text-dim);
  letter-spacing: 0.01em;
}
.brief-meta .sep {
  color: var(--border);
}

/* ————— Pay Attention callout ————— */
.pay-attention {
  margin: 0 0 3rem;
  padding: 1.5rem 1.5rem 1.75rem;
  background: linear-gradient(135deg, rgba(224, 123, 91, 0.08), rgba(212, 168, 83, 0.04));
  border: 1px solid rgba(224, 123, 91, 0.35);
  border-left: 3px solid var(--pay-attention);
  border-radius: var(--radius);
  position: relative;
}
.pay-attention::before {
  content: "Pay attention";
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--pay-attention);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

/* ————— Sections ————— */
.section {
  margin: 0 0 3.5rem;
}
.section-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin: 0 0 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text);
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
}
.section-title .num {
  font-size: 0.85rem;
  color: var(--gold);
  font-family: var(--font-sans);
  font-weight: 500;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  min-width: 1.25rem;
}

/* ————— Items ————— */
.item {
  margin-bottom: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-soft);
}
.item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}
.item-tier {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 2px;
  margin-bottom: 0.9rem;
  border: 1px solid;
}
.item-tier.t1 { color: var(--tier-1); border-color: rgba(212, 168, 83, 0.45); background: rgba(212, 168, 83, 0.07); }
.item-tier.t2 { color: var(--tier-2); border-color: rgba(122, 114, 255, 0.45); background: rgba(122, 114, 255, 0.07); }
.item-tier.t3 { color: var(--tier-3); border-color: rgba(91, 168, 196, 0.45); background: rgba(91, 168, 196, 0.07); }
.item-tier.t4 { color: var(--tier-4); border-color: rgba(224, 123, 91, 0.45); background: rgba(224, 123, 91, 0.07); }

.item h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
  color: var(--text);
}
.item h3 a {
  color: inherit;
  text-decoration: none;
}
.item p {
  margin: 0 0 1rem;
  color: var(--text);
}
.item p:last-child { margin-bottom: 0; }

/* Body text */
p, ul, ol {
  color: var(--text);
}
strong, b {
  color: var(--gold);
  font-weight: 600;
  letter-spacing: 0.005em;
}
em, i {
  font-style: italic;
  color: var(--text);
}

/* Links */
a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: rgba(212, 168, 83, 0.4);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: text-decoration-color 120ms ease;
}
a:hover {
  text-decoration-color: var(--gold);
}

/* Lists */
ul, ol {
  padding-left: 1.25rem;
  margin: 0 0 1rem;
}
li { margin-bottom: 0.35rem; }
li::marker { color: var(--gold); }

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(26, 58, 92, 0.6);
  padding: 0.1em 0.4em;
  border-radius: 3px;
  color: var(--gold);
  letter-spacing: 0;
}

/* Blockquote */
blockquote {
  margin: 1.5rem 0;
  padding: 0 0 0 1.25rem;
  border-left: 2px solid var(--gold);
  color: var(--text-dim);
  font-style: italic;
}

/* Horizontal rule — we strip these, but style in case */
hr {
  border: none;
  border-top: 1px solid var(--border-soft);
  margin: 3rem 0;
}

/* ————— Skip file ————— */
.skip-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  margin-top: 1rem;
}
.skip-list h3 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 400;
  margin: 0 0 0.5rem;
  color: var(--text-dim);
}
.skip-list ul {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  font-size: 0.925rem;
  color: var(--text-dim);
}
.skip-list li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

/* ————— Footer ————— */
.footer {
  margin-top: 5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-soft);
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer a { color: var(--text-dim); }

/* ————— Index page ————— */
.index-hero {
  margin: 1.5rem 0 4rem;
}
.index-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 3.75rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  font-weight: 400;
}
.index-hero h1 em {
  color: var(--gold);
  font-style: italic;
}
.index-hero p {
  font-size: 1.0625rem;
  color: var(--text-dim);
  max-width: 32rem;
  margin: 0;
}

.brief-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.brief-list li {
  margin-bottom: 0;
}
.brief-list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-soft);
  text-decoration: none;
  color: var(--text);
  gap: 1rem;
  transition: color 120ms ease;
}
.brief-list a:hover {
  color: var(--gold);
}
.brief-list a:hover .brief-list-date {
  color: var(--gold);
}
.brief-list-date {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  letter-spacing: -0.005em;
  transition: color 120ms ease;
}
.brief-list-meta {
  font-size: 0.8125rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  text-align: right;
  flex-shrink: 0;
  white-space: nowrap;
}