/* MBA Insights — design system partagé (articles + guides) */
:root {
  --bg: #ffffff;
  --fg: #141413;
  --muted: #6b6b66;
  --line: rgba(20,20,19,.12);
  --accent: #0d7a4f;
  --accent-dark: #0a5f3e;
  --panel: #f6f5f2;
  --gold: #a8722c;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Instrument Sans", system-ui, -apple-system, sans-serif;
  background: var(--bg); color: var(--fg);
  -webkit-font-smoothing: antialiased; line-height: 1.6;
  font-size: 17px;
}
.serif { font-family: "Instrument Serif", Georgia, serif; font-style: italic; font-weight: 400; }
.mono { font-family: "JetBrains Mono", monospace; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-head { border-bottom: 1px solid var(--line); }
.site-head .wrap { max-width: 1080px; margin: 0 auto; padding: 20px 24px; display: flex; justify-content: space-between; align-items: center; }
.brand { font-weight: 600; letter-spacing: -0.02em; font-size: 18px; color: var(--fg); }
.brand .mono { color: var(--muted); font-size: 13px; margin-left: 3px; }
.site-head nav a { color: var(--muted); margin-left: 24px; font-size: 14px; }
.site-head nav a:hover { color: var(--fg); text-decoration: none; }

/* Article layout */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.breadcrumb { font-size: 13px; color: var(--muted); padding: 24px 0 0; }
.breadcrumb a { color: var(--muted); }
.breadcrumb .sep { margin: 0 6px; color: #c0bfba; }
article { max-width: 700px; margin: 0 auto; padding: 8px 0 40px; }
article header { margin-bottom: 28px; }
.eyebrow { font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin-bottom: 12px; }
h1 { font-size: clamp(32px, 5vw, 44px); font-weight: 500; letter-spacing: -0.02em; line-height: 1.12; margin-bottom: 14px; }
.byline { font-size: 14px; color: var(--muted); }
.byline .sep { margin: 0 6px; }
h2 { font-size: 26px; font-weight: 500; letter-spacing: -0.01em; margin: 34px 0 14px; }
h3 { font-size: 20px; font-weight: 500; margin: 26px 0 10px; }
p { margin-bottom: 16px; }
ul, ol { margin: 0 0 18px 22px; }
li { margin-bottom: 8px; }
strong { font-weight: 600; }
blockquote { border-left: 3px solid var(--accent); padding: 4px 0 4px 18px; margin: 22px 0; color: var(--muted); font-style: italic; }
table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 15px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 500; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; }
tr:first-child th { border-top: 1px solid var(--line); }

/* Callout + CTA */
.cta-box { background: var(--fg); color: #ececea; border-radius: 16px; padding: 28px; margin: 34px 0; }
.cta-box h2 { color: #fff; margin-top: 0; }
.cta-box p { color: #b6b5b0; margin-bottom: 20px; }
.cta-box .btn { display: inline-block; background: var(--accent); color: #fff; padding: 13px 26px; border-radius: 100px; font-weight: 500; }
.cta-box .btn:hover { background: var(--accent-dark); text-decoration: none; }

/* FAQ */
.faq { margin: 34px 0; }
.faq details { border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin-bottom: 10px; background: #fff; }
.faq summary { font-weight: 500; cursor: pointer; }
.faq details p { margin: 10px 0 0; color: var(--muted); font-size: 16px; }

/* Related */
.related { border-top: 1px solid var(--line); padding: 28px 0; }
.related h2 { font-size: 20px; }
.related ul { list-style: none; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.related li { margin: 0; }
.related a { display: block; border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; color: var(--fg); }
.related a:hover { border-color: var(--accent); text-decoration: none; }
.related a .t { font-weight: 500; font-size: 15px; }
.related a .d { font-size: 13px; color: var(--muted); margin-top: 4px; }

/* Guides index */
.guides-hero { padding: 56px 0 20px; }
.guides-hero h1 { font-size: clamp(34px, 6vw, 52px); }
.guides-hero p { color: var(--muted); max-width: 600px; font-size: 18px; margin-top: 14px; }
.guide-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; padding: 24px 0 60px; }
.guide-card { border: 1px solid var(--line); border-radius: 16px; padding: 22px; }
.guide-card .num { font-family: "JetBrains Mono", monospace; font-size: 12px; color: var(--accent); }
.guide-card h2 { font-size: 19px; margin: 8px 0 6px; }
.guide-card h2 a { color: var(--fg); }
.guide-card p { font-size: 14px; color: var(--muted); margin: 0; }

/* Footer */
.site-foot { border-top: 1px solid var(--line); padding: 32px 0 48px; margin-top: 40px; }
.site-foot .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 20px; }
.site-foot .brand { font-size: 15px; }
.site-foot nav a { color: var(--muted); margin-right: 20px; font-size: 13px; }
.site-foot .legal { color: var(--muted); font-size: 13px; width: 100%; margin-top: 16px; }

@media (max-width: 720px) {
  .related ul, .guide-grid { grid-template-columns: 1fr; }
  .site-head nav a { margin-left: 14px; }
}