:root {
  --bg: #0a0d0b;
  --bg-alt: #12160f;
  --text: #f2f4ef;
  --text-muted: #98a199;
  --accent: #3ddc74;
  --accent-strong: #17a94a;
  --accent-2: #4cc3f0;
  --border: #232922;
  --card-bg: #12160f;
  --display: "Space Grotesk", "Inter", sans-serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
  --accent-rgb: 61, 220, 116;
  --accent-2-rgb: 76, 195, 240;
  --maxw: 880px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 1px 1px, rgba(var(--accent-rgb), 0.14) 1px, transparent 0) 0 0 / 26px 26px,
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 {
  font-family: var(--display);
  font-weight: 600;
  line-height: 1.2;
  color: var(--text);
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }

.header-icons {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-left: 18px;
  border-left: 1px solid var(--border);
}
.header-icons a { color: var(--text-muted); display: flex; }
.header-icons a:hover { color: var(--accent); }

.nav-wrap {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav {
  display: flex;
  gap: 24px;
  font-size: 0.92rem;
}
.nav a {
  position: relative;
  color: var(--text-muted);
  padding-bottom: 4px;
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: right 0.2s ease;
}
.nav a:hover { color: var(--accent); text-decoration: none; }
.nav a:hover::after { right: 0; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
}

/* Hero */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  gap: 40px;
  padding: 72px 24px 56px;
  flex-wrap: wrap;
  isolation: isolate;
}

.hero-photo {
  position: relative;
  flex-shrink: 0;
}

.hero-photo img {
  display: block;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg-alt);
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.6), 0 0 0 1px var(--border);
}

.hero-text { flex: 1; min-width: 260px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 8px;
  font-weight: 500;
}
.eyebrow::before { content: "// "; opacity: 0.6; }

.hero-text h1 {
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  margin: 0 0 14px;
}

.hero-lede {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 0 24px;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 6px;
  font-size: 0.92rem;
  font-weight: 600;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--accent-strong);
  color: #04140a;
  box-shadow: 0 0 0 1px rgba(var(--accent-rgb), 0.4), 0 8px 24px -10px rgba(var(--accent-rgb), 0.55);
}
.btn-primary:hover { background: var(--accent); }
.btn-outline { border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.hero-links {
  list-style: none;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
  font-size: 0.88rem;
}
.hero-links a { color: var(--text-muted); border-bottom: 1px dotted var(--border); }
.hero-links a:hover { color: var(--accent); text-decoration: none; }

.worked-with {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.worked-with-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.logo-strip {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  padding: 0;
  margin: 0;
}
.logo-strip li {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-muted);
  opacity: 0.7;
  letter-spacing: 0.01em;
  transition: opacity 0.15s ease, color 0.15s ease;
}
.logo-strip li:hover { opacity: 1; color: var(--accent); }

/* Sections */
.section {
  padding: 48px 24px;
  border-top: 1px solid var(--border);
}

.section h2 {
  font-size: 1.5rem;
  margin: 0 0 12px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.section > h2 + * {
  margin-top: 28px;
}

.num {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.03em;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
}

.lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
}

/* Research */
.research-item { margin-bottom: 36px; }
.research-item h3 { font-size: 1.15rem; margin: 0 0 6px; }
.research-meta {
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 600;
  margin: 0 0 14px;
}
.research-item ul { margin: 0; padding-left: 20px; color: var(--text-muted); }
.research-item li { margin-bottom: 8px; }
.research-origin { color: var(--text-muted); font-size: 0.92rem; margin: 0 0 18px; }
.research-interests {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  color: var(--text-muted);
}

.research-qmfv {
  margin: 0 0 24px;
  display: grid;
  gap: 16px;
}
.research-qmfv dt {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 4px;
}
.research-qmfv dd {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.research-figure {
  margin: 0 0 24px;
}
.research-figure img {
  display: block;
  width: 100%;
  max-width: 560px;
  border-radius: 6px;
  border: 1px solid var(--border);
}
.research-figure figcaption {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--text-muted);
  max-width: 560px;
}

.research-figure-wide {
  max-width: 100%;
}
.research-figure-wide img,
.research-figure-wide figcaption {
  max-width: 100%;
}

.research-figure-row {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.research-figure-row .research-figure {
  flex: 1 1 240px;
  max-width: 300px;
  margin-bottom: 0;
}
.research-figure-row .research-figure img,
.research-figure-row .research-figure figcaption {
  max-width: 100%;
}

.project-group-heading {
  font-family: var(--mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-2);
  margin: 32px 0 16px;
}
.project-group-heading:first-of-type { margin-top: 0; }

/* Timeline (education/experience) */
.timeline-item {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.timeline-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.timeline-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
.timeline-head h3 { font-size: 1.1rem; margin: 0; }
.timeline-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.timeline-org { color: var(--accent-2); font-weight: 600; margin: 4px 0 8px; font-size: 0.95rem; }
.timeline-item ul { margin: 8px 0 0; padding-left: 20px; color: var(--text-muted); }
.timeline-item li { margin-bottom: 6px; }
.muted { color: var(--text-muted); font-size: 0.9rem; }

/* Projects */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.project-card {
  position: relative;
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 18px;
  color: var(--text);
  overflow: hidden;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.project-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}
a.project-card:hover {
  border-color: var(--accent);
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px -8px rgba(var(--accent-rgb), 0.35);
}
a.project-card:hover::before { transform: scaleX(1); }
.project-card h3 { font-size: 1rem; margin: 0 0 8px; }
.project-card p { margin: 0; color: var(--text-muted); font-size: 0.9rem; }
.project-link {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-2);
}

/* Repo link (research section) */
.repo-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  transition: border-color 0.15s ease, color 0.15s ease;
}
.repo-link:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.repo-icon { color: var(--accent-2); }

/* Chips */
.chip-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0;
}
.chip {
  font-family: var(--mono);
  font-size: 0.8rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 10px;
  color: var(--text);
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.skills-grid h3 { font-size: 0.95rem; margin: 0 0 6px; color: var(--accent); }
.skills-grid p { margin: 0; color: var(--text-muted); font-size: 0.92rem; }
.cert-block { grid-column: 1 / -1; }
.cert-groups {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.cert-groups h4 {
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-2);
  margin: 0 0 8px;
}
.cert-list { margin: 0; padding-left: 20px; color: var(--text-muted); font-size: 0.92rem; }
.cert-list li { margin-bottom: 6px; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 24px;
}
.contact-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  border-radius: 6px;
  padding: 16px 18px;
  color: var(--text);
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.contact-card:hover {
  border-color: var(--accent);
  border-left-color: var(--accent);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -10px rgba(var(--accent-rgb), 0.35);
}
.contact-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.contact-value { font-weight: 600; font-size: 0.95rem; word-break: break-word; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
}
.site-footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
  margin: 0;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .project-card, .contact-card, .nav a::after { transition: none; }
}

/* Responsive nav */
@media (max-width: 700px) {
  .nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease;
  }
  .nav.open { max-height: 320px; }
  .nav a { padding: 14px 24px; border-top: 1px solid var(--border); }
  .nav-toggle { display: flex; }
  .header-icons { border-left: none; padding-left: 0; }
}