/* AI-Briefing — shared styles for the weekly briefing pages.
   Static, self-contained (no build step). Design tokens mirror the
   marketing landing (index.html) and how-to-claude. */

:root {
  --paper: #FAFAF7;
  --emerald-ink: #083A2A;
  --emerald: #0B6E4F;
  --moss: #D4EDE0;
  --signal: #F2653C;
  --graphite: #1A1A1A;
  --ink-08: rgba(8, 58, 42, 0.08);
  --ink-12: rgba(8, 58, 42, 0.12);
  --ink-15: rgba(8, 58, 42, 0.15);
  --ink-25: rgba(8, 58, 42, 0.25);
  --ink-60: rgba(8, 58, 42, 0.60);
  --ink-70: rgba(8, 58, 42, 0.70);
  --ink-80: rgba(8, 58, 42, 0.80);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--paper); color: var(--graphite); }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
::selection { background: var(--signal); color: var(--paper); }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
@media (min-width: 768px) { .wrap { padding: 0 40px; } }

.serif {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 144;
  font-weight: 400;
}
.mono { font-family: "JetBrains Mono", monospace; }

/* ---------- Header ---------- */
.site-head { border-bottom: 1px solid var(--ink-12); }
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; padding: 24px 0;
}
@media (min-width: 768px) { .nav { padding: 32px 0; } }
.logo img { height: 30px; width: auto; }
@media (min-width: 768px) { .logo img { height: 36px; } }
.nav-back {
  font-family: "JetBrains Mono", monospace; font-size: 12px;
  letter-spacing: 0.08em; color: var(--ink-60);
  text-decoration: none; text-transform: uppercase;
}
.nav-back:hover { color: var(--emerald); }

/* ---------- Hero ---------- */
.hero { padding: 64px 0 40px; }
@media (min-width: 768px) { .hero { padding: 96px 0 56px; } }
.eyebrow {
  font-family: "JetBrains Mono", monospace; font-size: 11px;
  letter-spacing: 0.18em; color: var(--ink-60);
  text-transform: uppercase; margin: 0 0 20px;
}
.hero h1 {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 144; font-weight: 400;
  color: var(--emerald-ink);
  font-size: clamp(40px, 7vw, 76px);
  line-height: 1.02; letter-spacing: -0.02em;
  margin: 0 0 24px; text-wrap: balance;
}
.hero .dek {
  font-size: clamp(17px, 2.2vw, 20px); line-height: 1.55;
  color: var(--ink-80); max-width: 640px; margin: 0;
}
.hero .kw-meta {
  font-family: "JetBrains Mono", monospace; font-size: 13px;
  letter-spacing: 0.04em; color: var(--emerald);
  margin: 0 0 24px;
}

/* ---------- Section ---------- */
.section { padding: 40px 0; }
@media (min-width: 768px) { .section { padding: 56px 0; } }
.section-head {
  display: flex; align-items: baseline; gap: 16px;
  margin: 0 0 28px; padding-bottom: 14px;
  border-bottom: 1px solid var(--ink-15);
}
.section-head h2 {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 96; font-weight: 400;
  color: var(--emerald-ink);
  font-size: clamp(26px, 4vw, 38px); line-height: 1.1;
  letter-spacing: -0.01em; margin: 0;
}
.section-head .count {
  font-family: "JetBrains Mono", monospace; font-size: 12px;
  letter-spacing: 0.08em; color: var(--ink-60);
}

/* ---------- Card grid ---------- */
.cards { display: grid; gap: 1px; background: var(--ink-12); border: 1px solid var(--ink-12); }
@media (min-width: 720px) { .cards { grid-template-columns: 1fr 1fr; } }

.card {
  background: var(--paper); padding: 28px 26px;
  display: flex; flex-direction: column; gap: 12px;
}
.card .src {
  font-family: "JetBrains Mono", monospace; font-size: 11px;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-60);
  display: flex; align-items: center; gap: 8px;
}
.card .src .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--ink-25); }
.card h3 {
  font-family: "Fraunces", Georgia, serif;
  font-variation-settings: "opsz" 72; font-weight: 400;
  color: var(--emerald-ink);
  font-size: 21px; line-height: 1.18; letter-spacing: -0.01em;
  margin: 0; text-wrap: balance;
}
.card h3 a { color: inherit; text-decoration: none; }
.card h3 a:hover { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--signal); }
.card h3 a[href]::after { content: " ↗"; color: var(--signal); font-size: 0.7em; vertical-align: 0.15em; }
.card .summary { margin: 0; color: var(--ink-80); font-size: 15px; line-height: 1.6; }
.card .takeaway {
  margin: 4px 0 0; padding-top: 12px; border-top: 1px dashed var(--ink-15);
  color: var(--emerald-ink); font-size: 14px; line-height: 1.55;
}
.card .takeaway b {
  font-family: "JetBrains Mono", monospace; font-weight: 500;
  font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--emerald); display: block; margin-bottom: 4px;
}

/* ---------- Highlights (boost) ---------- */
.highlights .cards { grid-template-columns: 1fr; background: var(--ink-12); }
@media (min-width: 720px) { .highlights .cards { grid-template-columns: 1fr 1fr; } }
.highlights .card { background: var(--moss); }
.highlights .card .src { color: var(--emerald); }
.highlights .card .takeaway { border-top-color: rgba(8, 58, 42, 0.2); }
.highlights .section-head h2 { color: var(--emerald-ink); }
.boost-flag {
  font-family: "JetBrains Mono", monospace; font-size: 10px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--signal); font-weight: 500;
}

/* ---------- Index / overview ---------- */
.week-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink-15); }
.week-list li { border-bottom: 1px solid var(--ink-15); }
.week-list a {
  display: grid; grid-template-columns: auto 1fr auto; gap: 16px 28px;
  align-items: baseline; padding: 28px 4px; text-decoration: none; color: inherit;
  transition: background-color 0.15s;
}
.week-list a:hover { background: var(--ink-08); }
.week-list .kw {
  font-family: "JetBrains Mono", monospace; font-size: 13px;
  letter-spacing: 0.06em; color: var(--emerald); text-transform: uppercase;
}
.week-list .wk-title {
  font-family: "Fraunces", Georgia, serif; font-variation-settings: "opsz" 72;
  color: var(--emerald-ink); font-size: clamp(20px, 3vw, 26px);
  line-height: 1.2; letter-spacing: -0.01em;
}
.week-list .wk-meta {
  font-family: "JetBrains Mono", monospace; font-size: 11px;
  letter-spacing: 0.06em; color: var(--ink-60); white-space: nowrap;
}
.week-list .arrow { color: var(--signal); }
@media (max-width: 600px) {
  .week-list a { grid-template-columns: 1fr; gap: 6px; }
  .week-list .wk-meta { display: none; }
}

/* ---------- Footer ---------- */
.site-foot {
  border-top: 1px solid var(--ink-15); margin-top: 40px;
  padding: 32px 0 48px; color: var(--ink-60);
  font-family: "JetBrains Mono", monospace; font-size: 11px;
  letter-spacing: 0.12em; text-transform: uppercase;
}
.foot-grid { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
.foot-grid a { color: inherit; text-decoration: none; }
.foot-grid a:hover { color: var(--emerald); }
.foot-links { display: flex; gap: 24px; flex-wrap: wrap; }