:root {
  --bg-primary: #121c19;
  --bg-secondary: #192723;
  --bg-card: rgba(26, 42, 38, 0.75);
  --border-color: #273d36;
  --border-highlight: #2dd4bf;
  
  --text-primary: #f2f7f5;
  --text-secondary: #a2b8b1;
  --text-muted: #6b847d;
  
  --accent-cyan: #2dd4bf;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-blue: #0d9488;
  
  --badge-bg: rgba(45, 212, 191, 0.12);
  --badge-border: rgba(45, 212, 191, 0.35);
  --badge-text: #2dd4bf;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, monospace;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --border-highlight: #0284c7;
  
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  
  --accent-cyan: #0284c7;
  --accent-emerald: #059669;
  --accent-amber: #d97706;
  --accent-blue: #2563eb;
  
  --badge-bg: rgba(2, 132, 199, 0.08);
  --badge-border: rgba(2, 132, 199, 0.25);
  --badge-text: #0284c7;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Nav Header */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 0;
  transition: background 0.25s ease, border-color 0.25s ease;
}

[data-theme="light"] .site-nav {
  background: rgba(255, 255, 255, 0.88);
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-brand span {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--accent-cyan);
  color: #0b1120;
  border-color: var(--accent-cyan);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.25);
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--border-highlight);
  background-color: var(--bg-secondary);
}

.btn-icon {
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.btn-icon:hover {
  color: var(--text-primary);
  border-color: var(--border-highlight);
}

/* Hero Section */
.hero {
  padding: 3.5rem 0 2rem 0;
}

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-emerald), var(--accent-blue));
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.hero-intro h1 {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.2;
}

.hero-intro .role-title {
  font-size: 1.25rem;
  color: var(--accent-cyan);
  font-weight: 600;
  margin-top: 0.35rem;
}

.hero-intro .role-sub {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.clearance-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #34d399;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

[data-theme="light"] .clearance-badge {
  color: #059669;
  background: rgba(16, 185, 129, 0.1);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.contact-item:hover {
  color: var(--accent-cyan);
}

/* Summary Box */
.summary-box {
  margin-top: 1.5rem;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Section Common */
.section {
  padding: 2.25rem 0;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.section-header h2 {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-primary);
}

.section-icon {
  color: var(--accent-cyan);
  font-size: 1.25rem;
}

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.skill-category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.skill-category-card:hover {
  border-color: var(--border-highlight);
  transform: translateY(-2px);
}

.skill-cat-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.skill-item-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.skill-item-desc {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* Projects Showcase */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 1.25rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
}

.project-card:hover {
  border-color: var(--accent-emerald);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.project-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.project-stack {
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: var(--accent-emerald);
  margin-bottom: 0.75rem;
}

.project-summary {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  border-radius: 4px;
}

/* Experience Timeline */
.timeline-company {
  margin-bottom: 2rem;
}

.company-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.timeline {
  position: relative;
  padding-left: 1.75rem;
  border-left: 2px solid var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: 1.75rem;
}

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

.timeline-dot {
  position: absolute;
  left: -2.35rem;
  top: 0.25rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-cyan);
  border: 3px solid var(--bg-primary);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.job-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.job-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.highlight-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.highlight-list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.highlight-list li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

/* Education Card */
.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.edu-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.edu-inst {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.edu-year {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  font-weight: 600;
}

.edu-degree {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-emerald);
  margin-bottom: 0.5rem;
}

.edu-details {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 0;
  margin-top: 3rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
  .hero-intro h1 {
    font-size: 1.9rem;
  }
  .skills-grid, .projects-grid {
    grid-template-columns: 1fr;
  }
  .timeline {
    padding-left: 1.25rem;
  }
  .timeline-dot {
    left: -1.85rem;
  }
}