/* ==========================================================
   ServiceAgent Thesis — shared stylesheet
   Used by: /thesis/ (hub), /thesis/ai-native/, /thesis/blueprint/, /thesis/team/
   ========================================================== */

:root {
  --ink: #0a0a0a;
  --cream: #f5f0e6;
  --cream-2: #ece6d8;
  --paper: #fbf8f2;
  --muted: #57534e;
  --faint: #8a857c;
  --line: rgba(10,10,10,0.09);
  --line-strong: rgba(10,10,10,0.16);
  --accent: #10b981;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; background: var(--cream); }
body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; }
::selection { background: var(--ink); color: var(--cream); }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}
.container-narrow {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 40px;
}

/* ===== NAV ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 16px 0;
  background: rgba(245, 240, 230, 0.88);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}
.logo-mark { height: 36px; width: 36px; border-radius: 6px; }
.logo-word {
  font-family: "Geist", sans-serif;
  font-weight: 600;
  font-size: 21px;
  letter-spacing: -0.025em;
  color: var(--ink);
}
.nav-links {
  display: inline-flex;
  align-items: center;
  gap: 24px;
}
.nav-link {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 14.5px;
  color: var(--muted);
  letter-spacing: -0.01em;
  transition: color 0.15s ease;
}
.nav-link:hover, .nav-link.active { color: var(--ink); }
.nav-cta {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 14px;
  padding: 10px 20px;
  background: var(--ink);
  color: var(--cream);
  border-radius: 10px;
  letter-spacing: -0.01em;
  transition: background 0.15s ease, transform 0.15s ease;
}
.nav-cta:hover { background: #1a1a1a; transform: translateY(-1px); }

/* ===== ARTICLE HERO ===== */
.thesis-hero {
  padding: 84px 0 52px;
  border-bottom: 1px solid var(--line);
  background: var(--cream);
}
.thesis-eyebrow {
  display: inline-block;
  font-family: "Geist Mono", monospace;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--faint);
  text-transform: uppercase;
  margin-bottom: 26px;
}
.thesis-hero h1 {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: clamp(40px, 5.4vw, 64px);
  letter-spacing: -0.036em;
  line-height: 1.04;
  margin: 0 0 18px;
  color: var(--ink);
  max-width: 880px;
}
.thesis-hero h1 em {
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.015em;
}
.thesis-hero .subtitle {
  font-family: "Inter", sans-serif;
  font-size: clamp(18px, 1.6vw, 22px);
  color: var(--muted);
  line-height: 1.5;
  max-width: 720px;
  margin: 0 0 34px;
}
.thesis-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: "Geist", sans-serif;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  flex-wrap: wrap;
}
.thesis-meta .author { color: var(--ink); }
.thesis-meta .divider {
  display: inline-block;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--line-strong);
}

/* ===== ARTICLE BODY ===== */
.thesis-body {
  padding: 56px 0 80px;
  font-size: 18.5px;
  line-height: 1.7;
  color: var(--ink);
}

/* Drop cap on the first paragraph of each essay */
.thesis-body > .container-narrow > p:first-of-type::first-letter {
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  font-size: 5.2em;
  float: left;
  line-height: 0.86;
  margin: 0.08em 0.1em 0 -0.04em;
  color: var(--ink);
  padding-top: 0.04em;
}

/* Pull quote */
.thesis-pullquote {
  margin: 56px 0;
  padding: 0;
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  font-size: clamp(26px, 2.6vw, 32px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  color: var(--ink);
  max-width: 780px;
  quotes: none;
}
.thesis-pullquote::before,
.thesis-pullquote::after { content: none; }

/* Stat comparison block */
.thesis-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin: 48px 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--paper);
}
.thesis-comparison-col {
  padding: 28px 28px 30px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.thesis-comparison-col + .thesis-comparison-col {
  border-left: 1px solid var(--line);
}
.thesis-comparison-col.highlight {
  background: var(--ink);
  color: var(--cream);
  border-left-color: var(--ink);
}
.thesis-comparison-label {
  font-family: "Geist Mono", monospace;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--faint);
  text-transform: uppercase;
}
.thesis-comparison-col.highlight .thesis-comparison-label { color: rgba(245,240,230,0.6); }
.thesis-comparison-value {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: clamp(32px, 3.6vw, 44px);
  letter-spacing: -0.035em;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.thesis-comparison-col.highlight .thesis-comparison-value { color: var(--cream); }
.thesis-comparison-desc {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.55;
  margin: 0;
}
.thesis-comparison-col.highlight .thesis-comparison-desc { color: rgba(245,240,230,0.78); }
@media (max-width: 640px) {
  .thesis-comparison { grid-template-columns: 1fr; }
  .thesis-comparison-col + .thesis-comparison-col { border-left: none; border-top: 1px solid var(--line); }
  .thesis-comparison-col.highlight + .thesis-comparison-col,
  .thesis-comparison-col + .thesis-comparison-col.highlight { border-top-color: var(--ink); }
}
/* Keep prose itself at readable width even inside the wider 960px container */
.thesis-body > .container-narrow,
.thesis-faq > .container-narrow { max-width: 820px; }
.thesis-body > p:first-of-type::first-line {
  font-weight: 500;
}
.thesis-body p {
  margin: 0 0 1.35em;
}
.thesis-body h2 {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: clamp(24px, 2.5vw, 30px);
  letter-spacing: -0.024em;
  line-height: 1.18;
  margin: 2.6em 0 0.8em;
  color: var(--ink);
}
.thesis-body h2:first-child { margin-top: 0; }
.thesis-body em {
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.thesis-body strong {
  font-weight: 600;
  color: var(--ink);
}
.thesis-body a {
  color: var(--ink);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 1px;
  transition: border-color 0.15s ease;
}
.thesis-body a:hover { border-bottom-color: var(--ink); }
.thesis-body hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.4em 0;
}
.thesis-body blockquote {
  border-left: 3px solid var(--ink);
  padding: 0.4em 0 0.4em 1.25em;
  margin: 1.75em 0;
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-size: 1.08em;
  color: var(--ink);
  line-height: 1.55;
}

/* ===== FAQ ===== */
.thesis-faq {
  padding: 64px 0;
  border-top: 1px solid var(--line);
  background: var(--paper);
}
.thesis-faq-heading {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: clamp(28px, 3vw, 40px);
  letter-spacing: -0.028em;
  line-height: 1.1;
  margin: 0 0 36px;
  color: var(--ink);
}
.faq-item {
  border-top: 1px solid var(--line);
  padding: 28px 0;
}
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-q {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 19px;
  letter-spacing: -0.018em;
  line-height: 1.3;
  margin: 0 0 12px;
  color: var(--ink);
}
.faq-a {
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--muted);
  margin: 0;
}

/* ===== END CTA ===== */
.thesis-cta {
  padding: 88px 0;
  background: var(--ink);
  color: var(--cream);
  text-align: center;
}
.thesis-cta h2 {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: clamp(30px, 3.4vw, 46px);
  letter-spacing: -0.032em;
  line-height: 1.1;
  margin: 0 0 14px;
  color: var(--cream);
}
.thesis-cta h2 em {
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.01em;
}
.thesis-cta p {
  font-size: 16.5px;
  color: rgba(245,240,230,0.72);
  margin: 0 0 30px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.55;
}
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 17px 36px;
  background: var(--cream);
  color: var(--ink);
  border-radius: 12px;
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 16px;
  letter-spacing: -0.01em;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn-cta:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(245,240,230,0.18); }

/* ===== PILLAR NAV (prev/next) ===== */
.pillar-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  padding: 44px 0 64px;
  border-top: 1px solid var(--line);
}
.pillar-nav-card {
  padding: 22px 24px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.pillar-nav-card:hover {
  border-color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(10,10,10,0.06);
}
.pillar-nav-card .dir {
  font-family: "Geist Mono", monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--faint);
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}
.pillar-nav-card .title {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 18px;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.25;
}
.pillar-nav-card.next { text-align: right; }

/* ===== HUB (thesis index) ===== */
.hub-hero {
  padding: 88px 0 48px;
  text-align: center;
}
.hub-hero h1 {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: clamp(44px, 6.4vw, 84px);
  letter-spacing: -0.042em;
  line-height: 1.0;
  margin: 18px 0 22px;
}
.hub-hero h1 em {
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.015em;
}
.hub-hero .lede {
  font-size: clamp(18px, 1.7vw, 22px);
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.55;
}
.hub-intro {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 40px 72px;
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink);
}
.hub-intro p { margin: 0 0 1.35em; }
.hub-intro em {
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  color: var(--ink);
}
.hub-pillars {
  padding: 40px 0 96px;
}

/* ===== Thesis Pillar Cards (Roman numeral dropcap) ===== */
.thesis-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}
.thesis-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px 32px 32px;
  text-decoration: none;
  color: inherit;
  min-height: 400px;
  transition: transform 0.3s cubic-bezier(.3,.8,.3,1), box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
}
.thesis-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 28px 56px rgba(10,10,10,0.08);
  border-color: var(--line-strong);
}
.thesis-card-numeral {
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  font-size: 96px;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--ink);
  display: block;
  margin-bottom: 4px;
}
.thesis-card-label {
  font-family: "Geist Mono", monospace;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--faint);
  text-transform: uppercase;
}
.thesis-card-title {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 26px;
  letter-spacing: -0.028em;
  line-height: 1.1;
  margin: 0;
  color: var(--ink);
}
.thesis-card-title em {
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.015em;
}
.thesis-card-excerpt {
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
  flex: 1;
}
.thesis-card-cta {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 14px;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-top: auto;
  transition: letter-spacing 0.2s ease;
}
.thesis-card:hover .thesis-card-cta {
  letter-spacing: 0em;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--ink);
  color: rgba(245,240,230,0.6);
  padding: 40px 0;
  font-size: 14px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.footer-logo img { height: 22px; width: 22px; border-radius: 4px; }
.footer-logo span {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 15px;
  color: var(--cream);
  letter-spacing: -0.02em;
}
.footer a { color: rgba(245,240,230,0.72); transition: color 0.15s ease; }
.footer a:hover { color: var(--cream); }
.footer-right {
  display: inline-flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-linkedin {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: "Geist", sans-serif;
  font-size: 13.5px;
}
.footer-link {
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 14px;
  letter-spacing: -0.01em;
}
.footer-book-btn {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  background: var(--cream);
  color: var(--ink) !important;
  border-radius: 8px;
  font-family: "Geist", sans-serif;
  font-weight: 500;
  font-size: 13.5px;
  letter-spacing: -0.01em;
  transition: background 0.15s ease, transform 0.15s ease;
}
.footer-book-btn:hover { background: #ffffff; transform: translateY(-1px); }
.footer-copyright { opacity: 0.72; }

/* ===== RESPONSIVE ===== */
@media (max-width: 820px) {
  .thesis-cards { grid-template-columns: 1fr; gap: 20px; }
  .thesis-card { min-height: auto; padding: 30px 24px 28px; }
  .thesis-card-numeral { font-size: 80px; }
  .pillar-nav { grid-template-columns: 1fr; }
  .pillar-nav-card.next { text-align: left; }
}
@media (max-width: 720px) {
  .container, .container-narrow { padding: 0 22px; }
  .nav { padding: 12px 0; }
  .nav-links { gap: 16px; }
  .nav-link { font-size: 14px; }
  .thesis-hero { padding: 56px 0 36px; }
  .thesis-hero .subtitle { margin-bottom: 26px; }
  .thesis-meta { gap: 12px; font-size: 11.5px; }
  .thesis-body { padding: 40px 0 56px; font-size: 17px; line-height: 1.7; }
  .thesis-body h2 { margin: 2.2em 0 0.7em; }
  .thesis-body > .container-narrow > p:first-of-type::first-letter {
    font-size: 4.4em;
    line-height: 0.88;
    margin: 0.1em 0.08em 0 -0.02em;
  }
  .thesis-pullquote {
    margin: 40px 0;
    font-size: 23px;
    line-height: 1.3;
  }
  .thesis-comparison { margin: 36px 0; border-radius: 10px; }
  .thesis-comparison-col { padding: 22px 22px 24px; gap: 8px; }
  .thesis-comparison-value { font-size: 32px; }
  .thesis-faq { padding: 44px 0; }
  .thesis-cta { padding: 64px 0; }
  .hub-hero { padding: 56px 0 32px; }
  .hub-intro { padding: 32px 22px 48px; font-size: 17px; }
  .hub-pillars { padding: 24px 0 64px; }
  .hub-pillar { padding: 28px 24px; }
  .pillar-nav { padding: 32px 0 52px; }
  .pillar-nav-card { padding: 18px 20px; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 14px; }
}
@media (max-width: 480px) {
  .logo-word { display: none; }
  .nav-links { gap: 12px; }
  .nav-cta { padding: 9px 14px; font-size: 13px; }
  .thesis-body > .container-narrow > p:first-of-type::first-letter {
    font-size: 3.8em;
  }
  .thesis-pullquote { font-size: 21px; margin: 32px 0; }
  .thesis-comparison-col { padding: 20px 20px 22px; }
  .thesis-comparison-value { font-size: 28px; }
}