/* Al Arab — applied ML/AI leadership. */

:root {
  --paper: #f4f5f6;
  --paper-2: #ffffff;
  --ink: #111318;
  --muted: #5c6168;
  --line: rgba(17, 19, 24, 0.14);
  --accent: #7a2e24;
  --header-h: 4.25rem;
  --max: 72rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--muted);
  background: var(--paper);
  min-height: 100vh;
  padding-top: var(--header-h);
}

a {
  color: var(--ink);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(18, 21, 26, 0.28);
}
a:hover { color: var(--accent); text-decoration-color: var(--accent); }

h1, h2, h3 {
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.18;
  margin: 0;
}

img { max-width: 100%; display: block; }

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.55rem 0.9rem;
  background: var(--ink);
  color: var(--paper);
  font-weight: 500;
  text-decoration: none;
}
.skip-link:focus { top: 0.75rem; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* Header */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 20;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
  background: rgba(244, 245, 246, 0.96);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--ink);
}
.brand-mark {
  display: block;
  width: 3.55rem;
  height: 2.05rem;
  object-fit: contain;
}
.brand-name {
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}
.site-nav a {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  white-space: nowrap;
}
.site-nav a:hover { color: var(--ink); }
.site-nav .nav-cta {
  min-height: 2.15rem;
  padding: 0 0.85rem;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--ink);
  color: var(--ink);
  letter-spacing: 0.08em;
}
.site-nav .nav-cta:hover {
  background: var(--ink);
  color: var(--paper);
}

.eyebrow {
  margin: 0 0 0.85rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.section-head {
  margin-bottom: 2.5rem;
  max-width: 40rem;
}
.section-head h2 {
  font-size: clamp(1.55rem, 2.8vw, 2.05rem);
  font-weight: 500;
}

/* Hero */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.75rem, 7vh, 4.75rem) clamp(1.25rem, 4vw, 3rem) 2.25rem;
  display: grid;
  grid-template-columns: 1.35fr 0.75fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.hero h1 {
  font-size: clamp(2rem, 4.2vw, 2.85rem);
  line-height: 1.1;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.role {
  margin: 0 0 0.4rem;
  font-size: 1.08rem;
  font-weight: 500;
  color: var(--ink);
}

.affiliations {
  margin: 0 0 1.35rem;
  max-width: 36rem;
  font-size: 0.95rem;
}

.lead {
  margin: 0 0 1.5rem;
  max-width: 36rem;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink);
}

.hero-actions {
  display: flex;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.4rem;
  padding: 0 1.1rem;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
}
.btn:hover { border-color: var(--ink); color: var(--ink); }
.btn-primary {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--paper);
}

.hero-portrait {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--paper-2);
  max-width: 22rem;
  justify-self: end;
}
.hero-portrait img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: 50% 18%;
}

.hero-404 {
  display: block;
  min-height: 55vh;
}

/* Facts */
.facts {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}
.facts ul {
  list-style: none;
  margin: 0;
  padding: 1.25rem 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  border-top: 1px solid var(--line);
}
.facts li { margin: 0; }
.facts strong {
  display: block;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.facts span {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.82rem;
}

/* Work */
.work {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3.75rem clamp(1.25rem, 4vw, 3rem) clamp(4rem, 8vh, 6rem);
  border-top: 1px solid var(--line);
}

.domains {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.domains li {
  padding: 1.85rem 0 1.95rem;
  border-bottom: 1px solid var(--line);
}
.domains li:nth-child(odd) { padding-right: 2.5rem; border-right: 1px solid var(--line); }
.domains li:nth-child(even) { padding-left: 2.5rem; }

.num {
  display: block;
  margin-bottom: 0.7rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--accent);
}

.domains h3 {
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.55rem;
}

.domains p {
  margin: 0;
  max-width: 32rem;
  font-size: 0.95rem;
}

/* Path */
.path {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.25rem clamp(1.25rem, 4vw, 3rem) clamp(4.25rem, 9vh, 6.5rem);
  border-top: 1px solid var(--line);
}

.path-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.timeline li {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1.25rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
}
.timeline li:last-child { border-bottom: 1px solid var(--line); }

.when {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--accent);
  padding-top: 0.15rem;
}

.timeline h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.15rem;
}

.timeline .title {
  margin: 0 0 0.3rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink);
}

.timeline p { margin: 0; font-size: 0.92rem; }

.lead-card {
  padding: 1.45rem 1.5rem 1.5rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  position: sticky;
  top: calc(var(--header-h) + 1.25rem);
}
.lead-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.65rem;
}
.lead-card p { margin: 0 0 1rem; color: var(--ink); font-size: 0.95rem; }
.lead-card ul {
  margin: 0;
  padding: 0 0 0 1.1rem;
  font-size: 0.9rem;
}
.lead-card li { margin-bottom: 0.4rem; }

/* Selected */
.selected {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.25rem clamp(1.25rem, 4vw, 3rem) clamp(3.25rem, 7vh, 5rem);
  border-top: 1px solid var(--line);
}

.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pub-list li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.25rem;
  padding: 0.95rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.98rem;
  color: var(--ink);
}
.pub-list li:last-child { border-bottom: 1px solid var(--line); }

.pub-list .yr {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  padding-top: 0.2rem;
}

.venue {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.86rem;
  color: var(--muted);
}

.more {
  margin: 1.6rem 0 0;
  font-size: 0.92rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-2);
  padding: 2.75rem clamp(1.25rem, 4vw, 3rem) 3.25rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-name {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.footer-mark {
  width: 2.9rem;
  height: 1.7rem;
  object-fit: contain;
}

.footer-note {
  margin: 0;
  max-width: 28rem;
  font-size: 0.92rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
}
.footer-links a {
  text-decoration: none;
  font-size: 0.92rem;
  color: var(--muted);
}
.footer-links a:hover { color: var(--accent); }

@media (max-width: 900px) {
  .facts ul { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  :root { --header-h: 6.15rem; }
  .site-header {
    flex-wrap: wrap;
    height: auto;
    min-height: var(--header-h);
    padding-top: 0.7rem;
    padding-bottom: 0.65rem;
    row-gap: 0.4rem;
  }
  .site-nav {
    flex: 1 0 100%;
    justify-content: flex-start;
  }
  .hero,
  .path-grid {
    grid-template-columns: 1fr;
  }
  .hero-portrait { max-width: 18rem; justify-self: start; }
  .domains { grid-template-columns: 1fr; }
  .domains li:nth-child(odd),
  .domains li:nth-child(even) {
    padding: 1.6rem 0;
    border-right: none;
  }
  .footer-links { align-items: flex-start; }
}

@media (max-width: 560px) {
  .brand-name { display: none; }
  .site-nav { gap: 0.85rem; }
  .site-nav .nav-cta {
    min-height: 0;
    padding: 0;
    border: none;
  }
  .hero h1 { font-size: 2rem; }
  .facts ul { grid-template-columns: 1fr 1fr; }
  .timeline li,
  .pub-list li {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}