/* Modern CSS with latest web standards */
:root {
  /* Enhanced color palette for better contrast and modern appeal */
  --bg: #0a0e1a;
  --bg-secondary: #0f1419;
  --card: #111827;
  --card-hover: #1f2937;
  --muted: #9ca3af;
  --text: #f9fafb;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-secondary: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  --glass: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  /* Design tokens */
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Typography */
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
}
/* Reset and base styles */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  height: 100%;
  margin: 0;
  background: linear-gradient(135deg, #0a0e1a 0%, #111827 50%, #0f1419 100%);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
/* Header styles */
.site-header {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--glass-border);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-weight: 700;
  font-size: 1.5rem;
  margin: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  list-style: none;
  display: flex;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.nav a:hover::after {
  width: 100%;
}
/* Hero section */
.hero {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 3rem;
  align-items: center;
  margin: 3rem 0;
  min-height: 60vh;
}

.eyebrow {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1.5rem 0;
  background: linear-gradient(135deg, var(--text), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 2rem;
}

.cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Button styles */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius);
  border: 0;
  cursor: pointer;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: white;
  box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.25);
}

.btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn.ghost {
  background: transparent;
  border: 1px solid var(--glass-border);
  color: var(--muted);
  backdrop-filter: blur(8px);
}

.btn.ghost:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-2px);
}

.hero-image {
  position: relative;
  width: 350px;
  height: 350px;
  margin: 0 auto;
}

.hero-image::before {
  content: '';
  position: absolute;
  inset: -1rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  border-radius: 50%;
  opacity: 0.15;
  z-index: -1;
  animation: pulse 3s ease-in-out infinite;
}

.hero-image::after {
  content: '';
  position: absolute;
  inset: -0.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  border-radius: 50%;
  opacity: 0.3;
  z-index: -1;
  filter: blur(8px);
}

.hero-image img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  transition: var(--transition);
  border: 4px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.hero-image:hover img {
  transform: scale(1.05);
  box-shadow: 0 25px 50px rgba(59, 130, 246, 0.3);
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.15; }
  50% { transform: scale(1.05); opacity: 0.25; }
}
/* Section styles */
section {
  margin: 2rem 0;
}

h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text);
}

/* Card layouts */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: var(--card);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--glass-border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

.card:hover {
  background: var(--card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card:hover::before {
  transform: scaleX(1);
}

.card h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.card ul {
  margin: 1rem 0 0 0;
  padding-left: 1.25rem;
}

.card li {
  margin-bottom: 0.5rem;
  color: var(--muted);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
/* Form styles */
.contact {
  background: var(--card);
  padding: 3rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  margin: 4rem 0;
}

.contact h3 {
  margin-bottom: 1rem;
}

.contact p {
  color: var(--muted);
  margin-bottom: 2rem;
}

.contact textarea,
.contact input {
  width: 100%;
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
  font-family: inherit;
  transition: var(--transition);
}

.contact textarea:focus,
.contact input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
  outline: none;
}

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

.form-row {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-row input {
  flex: 1;
}

.form-row:last-child {
  margin-top: 2rem;
  justify-content: flex-start;
}

/* Footer */
.site-footer {
  padding: 3rem 0;
  border-top: 1px solid var(--glass-border);
  margin-top: 4rem;
  text-align: center;
}

.site-footer p {
  margin: 0.5rem 0;
}

/* Utility classes */
.muted {
  color: var(--muted);
}

/* Responsive design */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  .hero {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }
  
  .hero-image {
    order: -1;
  }
  
  .hero-image {
    width: 280px;
    height: 280px;
  }
  
  .nav {
    gap: 1rem;
  }
  
  .form-row {
    flex-direction: column;
  }
  
  .cta-row {
    justify-content: center;
  }
  
  .contact {
    padding: 2rem;
  }
}

@media (max-width: 480px) {
  .nav {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .site-header .container {
    flex-direction: column;
    gap: 1rem;
  }
}

/* Skills table styles */
.skills-table-container {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  background: var(--card);
}

.skills-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.skills-table th {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: white;
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.skills-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--glass-border);
  vertical-align: top;
}

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

.skills-table tr:hover {
  background: var(--card-hover);
}

.skill-level {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.skill-level.expert {
  background: linear-gradient(135deg, var(--success), #059669);
  color: white;
}

.skill-level.advanced {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: white;
}

@media (max-width: 768px) {
  .skills-table {
    font-size: 0.85rem;
  }
  
  .skills-table th,
  .skills-table td {
    padding: 0.75rem 0.5rem;
  }
}

/* Certifications table styles */
.certifications-table-container {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--glass-border);
  background: var(--card);
}

.certifications-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.certifications-table th {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: white;
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.certifications-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--glass-border);
  vertical-align: top;
}

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

.certifications-table tr:hover {
  background: var(--card-hover);
}

.cert-id {
  font-size: 0.8rem;
  color: var(--muted);
  font-family: 'Courier New', monospace;
}

.cert-provider {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.cert-provider.aws {
  background: linear-gradient(135deg, #ff9900, #ff6600);
  color: white;
}

.cert-provider.azure {
  background: linear-gradient(135deg, #0078d4, #005a9e);
  color: white;
}

.cert-provider.neo4j {
  background: linear-gradient(135deg, #008cc1, #006a96);
  color: white;
}

.cert-provider.stanford {
  background: linear-gradient(135deg, #8c1515, #b83a4b);
  color: white;
}

.cert-status {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.cert-status.active {
  background: linear-gradient(135deg, var(--success), #059669);
  color: white;
}

@media (max-width: 768px) {
  .certifications-table {
    font-size: 0.85rem;
  }
  
  .certifications-table th,
  .certifications-table td {
    padding: 0.75rem 0.5rem;
  }
  
  .cert-provider,
  .cert-status {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
  }
}

/* Animation for page load */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero,
.card,
section {
  animation: fadeInUp 0.6s ease-out;
}

/* Smooth scrolling for older browsers */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}