/* Foundry Variant 1: Case Study Led
   B2B consultancy/law firm aesthetic — McKinsey, chambers website
   Clean typography, white space, document-like reading
*/

:root {
  --bg: #ffffff;
  --bg-alt: #f7f5f2;
  --bg-dark: #1a1a1a;
  --text: #1a1a1a;
  --text-muted: #555;
  --text-light: #888;
  --border: #e0ddd8;
  --accent: #8b6f47;
  --accent-light: #c4a67a;
  --accent-bg: #f4ede3;
  --green: #2d7a4e;
  --red: #b73e3e;
  --max-width: 1200px;
  --reading-width: 720px;
  --nav-height: 64px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  font-size: 18px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav-brand span { color: var(--accent); }

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}

.nav-logo span { color: var(--accent); }

.nav-links a.nav-cta {
  padding: 8px 20px;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active { color: var(--text); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  transition: 0.3s;
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.reading-container {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 64px 0; }
.section-lg { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Inter', system-ui, sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text);
}

h1 { font-size: clamp(32px, 5vw, 52px); }
h2 { font-size: clamp(26px, 4vw, 36px); margin-bottom: 24px; }
h3 { font-size: 22px; margin-bottom: 16px; }
h4 { font-size: 18px; margin-bottom: 12px; }

p { margin-bottom: 20px; }

.lead {
  font-size: 20px;
  line-height: 1.6;
  color: var(--text-muted);
}

.eyebrow {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
}

/* Hero */
.hero {
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--border);
}

.hero h1 { margin-bottom: 24px; }

.hero .lead {
  max-width: 640px;
  margin-bottom: 32px;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-trust {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.hero-trust-item {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  color: var(--text-muted);
}

.hero-trust-item strong {
  display: block;
  color: var(--text);
  font-weight: 600;
}

/* Buttons */
.btn {
  display: inline-block;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--text);
  color: #fff;
}

.btn-primary:hover { background: #333; }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover { border-color: var(--text); }

/* Problem cards */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.problem-card {
  border: 1px solid var(--border);
  padding: 32px;
  border-radius: 4px;
  background: var(--bg);
}

.problem-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
}

.problem-card p {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Pullquote */
.pullquote {
  border-left: 3px solid var(--accent);
  padding: 24px 32px;
  margin: 48px 0;
  font-size: 22px;
  line-height: 1.5;
  font-style: italic;
  color: var(--text);
  background: var(--accent-bg);
  border-radius: 0 4px 4px 0;
}

/* Case study cards */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.case-card {
  border: 1px solid var(--border);
  padding: 32px;
  border-radius: 4px;
  background: var(--bg);
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.2s, border-color 0.2s;
  display: flex;
  flex-direction: column;
}

.case-card:hover {
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  border-color: var(--accent-light);
}

.case-card-icon {
  font-size: 24px;
  margin-bottom: 16px;
}

.case-card h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.case-card .case-subtitle {
  font-style: italic;
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.case-card .case-results {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.case-card .case-link {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 12px;
}

/* Differentiators */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.diff-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.diff-item p {
  font-size: 16px;
  color: var(--text-muted);
}

/* Tables */
.table-wrap { overflow-x: auto; margin: 24px 0; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

table th {
  font-family: 'Inter', system-ui, sans-serif;
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 2px solid var(--text);
  color: var(--text);
}

table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

table tr:last-child td { border-bottom: none; }

/* CTA */
.cta-section {
  text-align: center;
  padding: 96px 0;
}

.cta-section h2 { margin-bottom: 24px; }

.cta-section p {
  max-width: 540px;
  margin: 0 auto 32px;
  color: var(--text-muted);
}

/* Case study detail */
.case-detail { padding: 48px 0 96px; }

.case-detail .case-meta {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.case-detail h2 {
  font-size: 24px;
  margin-top: 48px;
  margin-bottom: 16px;
}

.case-detail h3 {
  font-size: 19px;
  margin-top: 32px;
  margin-bottom: 12px;
}

.case-detail table { font-size: 14px; }

.before-after-table th { background: var(--bg-alt); }

.before-after-table .change-col {
  font-weight: 700;
  color: var(--green);
}

/* Quotes */
.quote {
  border-left: 3px solid var(--accent);
  padding: 16px 24px;
  margin: 24px 0;
  font-style: italic;
  color: var(--text-muted);
}

.quote cite {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  font-style: normal;
  color: var(--text-light);
  font-family: 'Inter', system-ui, sans-serif;
}

/* Technical details */
.tech-details {
  background: var(--bg-alt);
  padding: 32px;
  border-radius: 4px;
  margin-top: 48px;
}

.tech-details h3 {
  font-size: 16px;
  font-family: 'Inter', system-ui, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.tech-details dl {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 8px 24px;
  font-size: 14px;
  font-family: 'Inter', system-ui, sans-serif;
}

.tech-details dt { font-weight: 600; color: var(--text-muted); }
.tech-details dd { color: var(--text); }

/* Offers */
.offer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.offer-card {
  border: 1px solid var(--border);
  padding: 32px;
  border-radius: 4px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
}

.offer-card.featured {
  border-color: var(--text);
  border-width: 2px;
}

.offer-card .offer-price {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 32px;
  font-weight: 700;
  margin: 16px 0;
}

.offer-card .offer-price span {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-muted);
}

.offer-card ul {
  list-style: none;
  margin: 16px 0 24px;
  flex-grow: 1;
}

.offer-card li {
  font-size: 15px;
  color: var(--text-muted);
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.offer-card li:last-child { border-bottom: none; }

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
}

.faq-item h4 {
  font-size: 16px;
  margin-bottom: 8px;
}

.faq-item p {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* Contact form */
.contact-form {
  max-width: 560px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 16px;
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--text);
}

.form-group textarea { min-height: 120px; resize: vertical; }

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 0;
  background: var(--bg-alt);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.footer-brand span { color: var(--accent); }

.footer-copy {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 13px;
  color: var(--text-light);
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
}

.footer-links a:hover { color: var(--text); }

/* Diagram */
.stack-diagram {
  background: var(--bg-alt);
  padding: 32px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
  color: var(--text);
}

/* Setup timeline */
.setup-timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin: 32px 0;
}

.setup-step {
  text-align: center;
}

.setup-step .step-num {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  display: block;
}

.setup-step .step-label {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  font-weight: 600;
  margin: 8px 0;
}

.setup-step .step-time {
  font-size: 13px;
  color: var(--text-light);
}

/* Responsive */
@media (max-width: 900px) {
  .problem-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .diff-grid { grid-template-columns: 1fr; }
  .offer-grid { grid-template-columns: 1fr; }
  .setup-timeline { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
  }
  
  .nav-links.open { display: flex; }
  
  .nav-toggle { display: block; }
  
  .hero { padding: 48px 0 32px; }
  .section { padding: 48px 0; }
  .section-lg { padding: 64px 0; }
  .cta-section { padding: 64px 0; }
  
  .hero-trust { flex-direction: column; gap: 16px; }
  
  .tech-details dl { grid-template-columns: 1fr; }
  
  .setup-timeline { grid-template-columns: 1fr; }
  
  body { font-size: 16px; }
}

/* Contact form */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 16px;
  font-family: 'Inter', system-ui, sans-serif;
  background: #fff;
  color: var(--text);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea { min-height: 100px; resize: vertical; }

/* Utility */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }