/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #F8F6F3;
  --bg-alt:    #EFECE8;
  --white:     #FFFFFF;
  --ink:       #1C1C1C;
  --ink-mid:   #4A4A4A;
  --ink-light: #7A7472;
  --accent:    #4A6B5C;
  --accent-light: #E8F0EC;
  --border:    #DDD9D4;
  --radius:    12px;
  --radius-sm: 6px;
  --shadow:    0 2px 16px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 32px rgba(0,0,0,0.09);
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-serif: 'Lora', Georgia, serif;
  --max-w:     1100px;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── Nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 60px;
  background: rgba(248,246,243,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-name {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-mid);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--accent); }

.nav-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: all var(--transition);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 99;
  padding: 1rem 2rem;
  gap: 1rem;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink-mid);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

/* ── Hero ── */
.hero {
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  padding: 5rem 2rem 4rem;
  background: var(--bg);
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 400;
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: 0.5rem;
}

.hero-title {
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--ink-light);
  margin-bottom: 1.75rem;
  letter-spacing: 0.01em;
}

.hero-bio {
  font-size: 1.05rem;
  color: var(--ink-mid);
  line-height: 1.8;
  max-width: 600px;
  margin-bottom: 2.5rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.hero-companies {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--ink-light);
  letter-spacing: 0.02em;
}
.hero-companies .dot { color: var(--border); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: var(--white);
  border: 1.5px solid var(--accent);
}
.btn-primary:hover { background: #3a5849; border-color: #3a5849; }
.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ── Sections ── */
.section { padding: 6rem 2rem; }
.section--alt { background: var(--bg-alt); }

.container { max-width: var(--max-w); margin: 0 auto; }

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 0.6rem;
}

.section-sub {
  font-size: 1rem;
  color: var(--ink-light);
  margin-bottom: 3.5rem;
  max-width: 580px;
}

/* ── Case Cards ── */
.case-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition);
  overflow: hidden;
}
.case-card:hover { box-shadow: var(--shadow-md); }
.case-card--featured { border-left-width: 4px; }

/* ── Case Card Banners ── */
.case-banner {
  height: 120px;
  margin: -2.5rem -2.5rem 2rem;
  position: relative;
  overflow: hidden;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 2.5rem;
}

.case-banner--square::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: #1D1D1D;
}
.case-banner--lyft::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: #FF00BF;
}
.case-banner--whatsapp {
  background: #25D366;
  border-bottom-color: #1da851;
}

.case-banner-logo {
  height: 36px;
  width: auto;
  display: block;
}
.case-banner--lyft .case-banner-logo { height: 44px; }
.case-banner--whatsapp .case-banner-logo { height: 28px; }

/* Company colour themes */
.case-card--square   { border-left: 4px solid #4A6B5C; }
.case-card--lyft     { border-left: 4px solid #9B5E72; }
.case-card--whatsapp { border-left: 4px solid #2E7A5C; }

.case-tag--square   { background: #E8F0EC; color: #4A6B5C; }
.case-tag--lyft     { background: #F5EBF0; color: #9B5E72; }
.case-tag--whatsapp { background: #E5F2EC; color: #2E7A5C; }

.case-company--lyft     { color: #9B5E72; }
.case-company--whatsapp { color: #2E7A5C; }

.case-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.case-tag {
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.75rem;
  border-radius: 99px;
}

.case-year {
  font-size: 0.8rem;
  color: var(--ink-light);
}

.case-body {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.5rem;
}

.case-text h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 0.3rem;
  line-height: 1.3;
}

.case-company {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.case-desc {
  color: var(--ink-mid);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.case-highlights {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.highlight {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 0.75rem;
  font-size: 0.85rem;
}
.highlight-label {
  font-weight: 600;
  color: var(--ink-light);
  white-space: nowrap;
}
.highlight span:last-child { color: var(--ink-mid); }

.case-findings, .case-impact {
  margin-bottom: 1.25rem;
}
.case-findings h4, .case-impact h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-light);
  margin-bottom: 0.6rem;
}
.case-findings li, .case-impact li {
  font-size: 0.9rem;
  color: var(--ink-mid);
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.5rem;
  line-height: 1.65;
}
.case-findings li::before, .case-impact li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.8rem;
}

.case-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.sidebar-block {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
}
.sidebar-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-light);
  margin-bottom: 0.5rem;
}
.sidebar-block p {
  font-size: 0.875rem;
  color: var(--ink-mid);
  line-height: 1.65;
  font-style: italic;
}

/* ── Talks ── */
.talks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.talk-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: box-shadow var(--transition);
}
.talk-card:hover { box-shadow: var(--shadow-md); }

.talk-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}
.talk-conf {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}
.talk-date {
  font-size: 0.75rem;
  color: var(--ink-light);
}
.talk-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.4;
}
.talk-track {
  font-size: 0.78rem;
  color: var(--ink-light);
  font-weight: 500;
}
.talk-desc {
  font-size: 0.875rem;
  color: var(--ink-mid);
  line-height: 1.7;
  flex: 1;
}
.talk-link {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 0.5rem;
  display: inline-block;
  transition: opacity var(--transition);
}
.talk-link:hover { opacity: 0.7; }

/* ── Featured Talk ── */
.talk-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  margin-top: 2rem;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.talk-feature-img {
  position: relative;
  min-height: 300px;
  background: var(--bg-alt);
  overflow: hidden;
}
.talk-feature-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.talk-feature-img.img-missing img { display: none; }
.img-placeholder-text {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  font-size: 0.8rem;
  color: var(--ink-light);
  line-height: 1.6;
}
.talk-feature-img.img-missing .img-placeholder-text { display: flex; }

.talk-feature-text {
  padding: 2.5rem 2.5rem 2.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.talk-feature-text .talk-title { font-size: 1.25rem; }
.talk-photo-credit {
  font-size: 0.75rem;
  color: var(--ink-light);
  margin-top: auto;
  padding-top: 1rem;
}

@media (max-width: 700px) {
  .talk-feature {
    grid-template-columns: 1fr;
  }
  .talk-feature-img { min-height: 220px; }
  .talk-feature-text { padding: 1.5rem; }
}

/* ── Academic ── */
.academic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.academic-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.academic-icon {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-light);
  padding: 0.25rem 0.75rem;
  border-radius: 99px;
  align-self: flex-start;
}

.academic-card h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--ink);
  line-height: 1.4;
}

.academic-institution {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.01em;
}

.academic-desc {
  font-size: 0.9rem;
  color: var(--ink-mid);
  line-height: 1.75;
  flex: 1;
}

.academic-award {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--ink-light);
  background: var(--bg);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

/* ── Skills ── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.skill-group {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.skill-group h4 {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.skill-group li {
  font-size: 0.875rem;
  color: var(--ink-mid);
  padding: 0.3rem 0;
  border-bottom: 1px solid var(--bg-alt);
  line-height: 1.5;
}
.skill-group li:last-child { border-bottom: none; }

/* ── Contact ── */
.contact-section { background: var(--ink); }
.contact-inner {
  text-align: center;
  padding: 2rem 0;
}
.contact-section .section-title { color: var(--white); }
.contact-desc {
  color: rgba(255,255,255,0.6);
  font-size: 1rem;
  margin-bottom: 2.5rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}
.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.contact-section .btn-primary {
  background: var(--accent);
  border-color: var(--accent);
}
.contact-section .btn-outline {
  color: rgba(255,255,255,0.8);
  border-color: rgba(255,255,255,0.25);
}
.contact-section .btn-outline:hover {
  border-color: var(--accent);
  color: var(--white);
}

/* ── Password Gate ── */
.gate {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 2rem;
  transition: opacity 0.3s ease;
}
.gate--open {
  opacity: 0;
  pointer-events: none;
}
.gate-modal {
  max-width: 400px;
  width: 100%;
  text-align: center;
}
.gate-back {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--ink-light);
  margin-bottom: 2.5rem;
  transition: color var(--transition);
}
.gate-back:hover { color: var(--accent); }
.gate-eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.gate-title {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 0.6rem;
  line-height: 1.2;
}
.gate-desc {
  font-size: 0.88rem;
  color: var(--ink-light);
  margin-bottom: 2rem;
  line-height: 1.65;
}
.gate-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.gate-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: var(--font-sans);
  background: var(--white);
  color: var(--ink);
  outline: none;
  transition: border-color var(--transition);
  text-align: center;
  letter-spacing: 0.15em;
}
.gate-input:focus { border-color: var(--accent); }
.gate-input--error { border-color: #b94040; animation: gate-shake 0.4s ease; }
.gate-btn { width: 100%; justify-content: center; }
.gate-error {
  display: none;
  font-size: 0.8rem;
  color: #b94040;
  margin-top: 0.6rem;
}
@keyframes gate-shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

/* ── Case Study Page ── */
.cs-hero {
  padding: 4rem 2rem 3rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.cs-hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.cs-back {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--ink-light);
  margin-bottom: 2rem;
  transition: color var(--transition);
}
.cs-back:hover { color: var(--accent); }
.cs-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}
.cs-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 400;
  color: var(--ink);
  line-height: 1.15;
  margin-bottom: 0.5rem;
}
.cs-company {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.02em;
}
.cs-body {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 2rem;
}
.cs-section {
  margin-bottom: 3rem;
}
.cs-section h2 {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-light);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}
.cs-section p {
  font-size: 0.975rem;
  color: var(--ink-mid);
  line-height: 1.8;
  margin-bottom: 0.75rem;
}
.cs-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.cs-section li {
  font-size: 0.95rem;
  color: var(--ink-mid);
  padding-left: 1.25rem;
  position: relative;
  line-height: 1.7;
}
.cs-section li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.8rem;
}
.cs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}
.cs-pdf-wrap {
  margin-top: 2.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.cs-pdf-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 1.25rem;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}
.cs-pdf-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-light);
}
.cs-pdf {
  display: block;
  width: 100%;
  height: 85vh;
  border: none;
  background: var(--bg-alt);
}
@media (max-width: 700px) {
  .cs-grid { grid-template-columns: 1fr; gap: 0; }
  .cs-body { padding: 3rem 1.25rem; }
  .cs-hero { padding: 3rem 1.25rem 2.5rem; }
}

/* ── Footer ── */
.footer {
  background: var(--ink);
  border-top: 1px solid rgba(255,255,255,0.08);
  text-align: center;
  padding: 1.25rem 2rem;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.3);
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .case-body {
    grid-template-columns: 1fr;
  }
  .case-sidebar {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .sidebar-block { flex: 1 1 240px; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-menu-btn { display: flex; }

  .hero { padding: 3rem 1.25rem 3rem; min-height: auto; }
  .section { padding: 4rem 1.25rem; }
  .nav { padding: 0 1.25rem; }

  .case-card { padding: 1.5rem; }
  .talk-card, .academic-card, .skill-group { padding: 1.5rem; }

  .hero-cta { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }

  .contact-links { flex-direction: column; align-items: center; }
  .contact-links .btn { width: auto; min-width: 200px; }

  .highlight { grid-template-columns: 1fr; gap: 0.2rem; }
  .highlight-label { font-size: 0.75rem; }
}