/* ==============================================
   CSS VARIABLES — Design Tokens
   ============================================== */
:root {

  

  

  

  --content-width: 800px;

  

}

/* ==============================================
   BASE STYLES
   ============================================== */

/* ==============================================
   LAYOUT
   ============================================== */

.content-narrow {
  max-width: var(--content-width);
}

/* ==============================================
   TYPOGRAPHY
   ============================================== */
h1 {
  font-family: var(--font-hero);
  font-weight: 400;
  font-size: clamp(36px, 4vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

h2 {
  font-family: var(--font-section);
  font-weight: 400;
  font-size: clamp(28px, 3vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.005em;
}

h3 {
  font-family: var(--font-subtle);
  font-weight: 400;
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.25;
}

h4 {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.3;
}

p {
  max-width: 65ch;
}

.meta {
  font-size: 13px;
  line-height: 1.4;
  color: var(--color-meta);
}

/* ==============================================
   PAGE HEADER
   ============================================== */
.page-header {
  padding: var(--space-4xl) 0 var(--space-3xl);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  margin-bottom: var(--space-lg);
}

.page-intro {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-meta);
  max-width: 55ch;
}

.page-domains {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.domain-tag {
  font-size: 12px;
  font-weight: 500;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text);
}

/* ==============================================
   SECTION HEADERS
   ============================================== */
.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.section-note {
  font-size: 13px;
  color: var(--color-meta);
  font-style: italic;
  margin-top: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border-left: 2px solid var(--color-border);
  border-radius: 0 4px 4px 0;
}

.section-divider {
  border-top: 1px solid var(--color-border);
}

/* ==============================================
   EXPERIENCE TIMELINE
   ============================================== */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.experience-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-xl);
}

@media (max-width: 768px) {
  .experience-item {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
}

.experience-meta {
  padding-top: var(--space-xs);
}

.experience-dates {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.experience-location {
  font-size: 13px;
  color: var(--color-meta);
}

.experience-content h4 {
  margin-bottom: var(--space-xs);
}

.experience-company {
  font-size: 15px;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.experience-summary {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.experience-highlights {
  list-style: none;
  margin-bottom: var(--space-md);
}

.experience-highlights li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-meta);
  padding-left: var(--space-lg);
  position: relative;
  margin-bottom: var(--space-sm);
}

.experience-highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  opacity: 0.6;
}

.experience-tech {
  font-size: 12px;
  color: var(--color-meta);
  font-style: italic;
}

/* ==============================================
   PRODUCTS LIST
   ============================================== */
.products-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

@media (max-width: 900px) {
  .products-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .products-list {
    grid-template-columns: 1fr;
  }
}

.products-group h4 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.product-links {
  list-style: none;
}

.product-links li {
  font-size: 14px;
  line-height: 1.5;
  padding: var(--space-xs) 0;
}

.product-links a {
  color: var(--color-text);
  transition: color 0.2s ease;
}

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

.product-note {
  font-size: 11px;
  color: var(--color-meta);
  font-style: italic;
}

/* ==============================================
   PROJECTS GRID
   ============================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

@media (max-width: 768px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: border-color 0.2s ease;
}

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

.project-card h4 {
  margin-bottom: var(--space-sm);
  font-size: 16px;
}

.project-meta {
  font-size: 12px;
  color: var(--color-meta);
  margin-bottom: var(--space-md);
}

.project-meta span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.project-meta span::after {
  content: '·';
  margin-left: var(--space-sm);
  color: var(--color-border);
}

.project-meta span:last-child::after {
  display: none;
}

.project-description {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.tech-tag {
  font-size: 11px;
  font-weight: 500;
  padding: 2px var(--space-sm);
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  color: var(--color-meta);
}

/* ==============================================
   SKILLS SECTION
   ============================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

@media (max-width: 900px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }
}

.skill-category h4 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.skill-list {
  list-style: none;
}

.skill-list li {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text);
  padding: var(--space-xs) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.years-exp {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-accent);
  background: rgba(74, 107, 138, 0.1);
  padding: 2px 8px;
  border-radius: 999px;
  white-space: nowrap;
}

/* ==============================================
   PATENTS & AWARDS
   ============================================== */
.patents-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.patent-item {
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.patent-item h4 {
  font-size: 16px;
  margin-bottom: var(--space-sm);
}

.patent-number {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.patent-description {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-meta);
}

.patent-content {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: var(--space-lg);
  align-items: start;
}

@media (max-width: 640px) {
  .patent-content {
    grid-template-columns: 1fr;
  }
  
  .patent-figure {
    order: -1;
  }
}

.patent-figure {
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: visible;
  background: white;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease, z-index 0s;
}

.patent-figure:hover {
  transform: scale(2.5);
  transform-origin: top right;
  box-shadow: 0 20px 60px rgba(31, 31, 31, 0.25);
  z-index: 100;
}

.patent-figure img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-sm);
}

.patent-figure::after {
  content: 'Click to download PDF';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(31, 31, 31, 0.85);
  color: white;
  font-size: 11px;
  text-align: center;
  padding: var(--space-xs) var(--space-sm);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.patent-figure:hover::after {
  opacity: 1;
}

.patent-links {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.patent-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 13px;
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

.patent-link:hover {
  color: var(--color-accent-hover);
}

.patent-link svg {
  width: 14px;
  height: 14px;
}

/* ==============================================
   CAREER SUMMARY STATS
   ============================================== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-3xl);
}

@media (max-width: 768px) {
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-family: var(--font-hero);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 400;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: 13px;
  color: var(--color-meta);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#site-footer .footer {
  margin-top: var(--space-3xl);
}