:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-card-hover: #253347;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-hover: #7dd3fc;
  --accent-dim: rgba(56, 189, 248, 0.1);
  --accent-border: rgba(56, 189, 248, 0.2);
  --border: rgba(148, 163, 184, 0.1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1120px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition);
}

.hero-layout {
  display: flex;
  align-items: center;
  gap: 60px;
}

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

.photo-wrapper {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--accent-border);
  position: relative;
  background: var(--bg-primary);
}

.photo-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.photo-placeholder {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.photo-wrapper.placeholder img {
  display: none;
}

.photo-wrapper.placeholder .photo-placeholder {
  display: flex;
}

.hero {
  min-height: auto;
  display: flex;
  align-items: center;
  padding: 100px 0 60px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.08) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse-glow 6s ease-in-out infinite alternate;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -300px;
  left: -200px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.04) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse-glow 8s ease-in-out 2s infinite alternate;
}

@keyframes pulse-glow {
  0% {
    opacity: 0.5;
    transform: scale(1);
  }

  100% {
    opacity: 1;
    transform: scale(1.15);
  }
}

.hero-content {
  max-width: 720px;
}

.hero-label {
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 20px;
  opacity: 0;
  animation: hero-slide-up 0.7s ease forwards 0.2s;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--text-primary);
  opacity: 0;
  animation: hero-slide-up 0.8s ease forwards 0.4s;
}

.hero-summary {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 640px;
  opacity: 0;
  animation: hero-slide-up 0.8s ease forwards 0.6s;
}

@keyframes hero-slide-up {
  from {
    opacity: 0;
    transform: translateY(24px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes hero-photo-in {
  from {
    opacity: 0;
    transform: scale(0.85);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
  opacity: 0;
  animation: hero-slide-up 0.8s ease forwards 0.8s;
}

.hero-location {
  opacity: 0;
  animation: hero-slide-up 0.7s ease forwards 1s;
}

.hero-photo {
  opacity: 0;
  animation: hero-photo-in 1s ease forwards 0.5s;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: var(--font);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg-primary);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.hero-location {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  margin-bottom: 36px;
  max-width: 560px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1rem;
  line-height: 1.8;
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-pillars {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pillar-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: all var(--transition);
}

.pillar-item:hover {
  border-color: var(--accent-border);
  background: var(--bg-card-hover);
}

.pillar-item svg {
  color: var(--accent);
  flex-shrink: 0;
}

.expertise-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.expertise-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.expertise-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  transition: all var(--transition);
}

.expertise-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
}

.expertise-icon {
  color: var(--accent);
  margin-bottom: 20px;
}

.expertise-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.expertise-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.expertise-list li {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  padding-left: 20px;
  position: relative;
}

.expertise-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.6;
}

.timeline {
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 24px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -40px;
  top: 28px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent);
  z-index: 1;
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  transition: all var(--transition);
}

.timeline-card:hover {
  border-color: var(--accent-border);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
  gap: 16px;
}

.timeline-header h3 {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.timeline-company {
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 500;
  margin-top: 4px;
}

.timeline-date {
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 500;
  white-space: nowrap;
  padding: 4px 12px;
  background: var(--accent-dim);
  border-radius: 20px;
  flex-shrink: 0;
}

.timeline-card>p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.timeline-tags span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 10px;
  border-radius: 20px;
}

.ai-eval-intro {
  margin-bottom: 36px;
}

.ai-eval-intro p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.8;
  max-width: 900px;
}

.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.project-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.project-heading {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.project-items {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.project-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.project-item svg {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.project-item-finding svg {
  color: #fbbf24;
}

.impact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.impact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: all var(--transition);
}

.impact-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
}

.impact-metric {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 10px;
}

.impact-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

.ai-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}

.ai-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
}

.ai-card-number {
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 14px;
  opacity: 0.7;
}

.ai-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.ai-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.achievement-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
}

.achievement-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
}

.achievement-metric {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.achievement-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.achievement-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.cert-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: all var(--transition);
}

.cert-card:hover {
  border-color: var(--accent-border);
}

.cert-icon {
  color: var(--accent);
  flex-shrink: 0;
}

.cert-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.cert-card p {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
}

a.cert-card-link {
  color: var(--text-primary);
}

a.cert-card-link:hover {
  color: var(--text-primary);
  border-color: var(--accent);
}

.cert-verify {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}

.insight-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
}

.insight-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.insight-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.insight-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 900px;
}

.contact-card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: all var(--transition);
  color: var(--text-primary);
}

.contact-card:hover {
  border-color: var(--accent-border);
  background: rgba(15, 23, 42, 0.8);
  color: var(--text-primary);
}

.contact-card svg {
  color: var(--accent);
  flex-shrink: 0;
}

.contact-card h3 {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.contact-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
}

.footer p {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.privacy-link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.8125rem;
  padding: 0;
  transition: opacity 0.2s ease;
}

.privacy-link:hover {
  opacity: 0.7;
}

.privacy-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  text-align: left;
}

.privacy-content .container {
  padding-top: 16px;
  color: var(--text-muted);
}

.privacy-content h3 {
  margin-bottom: 8px;
  font-size: 1rem;
  color: var(--text);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(16px);
    flex-direction: column;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 60px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-summary {
    font-size: 1rem;
  }

  .hero-layout {
    flex-direction: column-reverse;
    gap: 32px;
    text-align: center;
  }

  .hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .photo-wrapper {
    width: 160px;
    height: 160px;
  }

  .hero-cta {
    flex-direction: column;
    gap: 12px;
  }

  .btn {
    text-align: center;
    justify-content: center;
  }

  .section {
    padding: 48px 0;
  }

  .section-subtitle {
    margin-bottom: 32px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .expertise-grid,
  .expertise-grid-3 {
    grid-template-columns: 1fr;
  }

  .project-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .impact-grid {
    grid-template-columns: 1fr 1fr;
  }

  .timeline {
    padding-left: 32px;
  }

  .timeline-header {
    flex-direction: column;
  }

  .timeline-date {
    align-self: flex-start;
  }

  .ai-grid {
    grid-template-columns: 1fr;
  }

  .achievements-grid {
    grid-template-columns: 1fr;
  }

  .certs-grid {
    grid-template-columns: 1fr;
  }

  .insights-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.5rem;
  }

  .container {
    padding: 0 16px;
  }

  .timeline-card {
    padding: 20px;
  }

  .expertise-card {
    padding: 24px;
  }

  .impact-grid {
    grid-template-columns: 1fr;
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.scale-in.visible {
  opacity: 1;
  transform: scale(1);
}

.section-title {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.section-title.visible {
  opacity: 1;
  transform: translateY(0);
}

.section-subtitle {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease 0.15s, transform 0.6s ease 0.15s;
}

.section-subtitle.visible {
  opacity: 1;
  transform: translateY(0);
}

.photo-wrapper {
  animation: photo-float 4s ease-in-out infinite alternate;
}

@keyframes photo-float {
  0% {
    transform: translateY(0);
  }

  100% {
    transform: translateY(-8px);
  }
}

.timeline-marker {
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.timeline-item:hover .timeline-marker {
  transform: scale(1.3);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

.achievement-metric {
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.achievement-card:hover .achievement-metric {
  transform: scale(1.1);
}

.expertise-list li {
  transition: transform 0.25s ease, color 0.25s ease;
}

.expertise-list li:hover {
  transform: translateX(6px);
  color: var(--text-primary);
}

.btn {
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.btn:hover::after {
  transform: translateX(100%);
}

.navbar {
  transition: background 0.4s ease, box-shadow 0.4s ease;
}

.navbar.scrolled {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}