:root {
  --color-bg: #ffffff;
  --color-surface: #f8f9fa;
  --color-surface-hover: #e9ecef;
  --color-text: #212529;
  --color-text-secondary: #6c757d;
  --color-border: #dee2e6;
  --color-primary: #0066cc;
  --color-primary-hover: #0052a3;
  --color-accent: #ffc107;
  --color-success: #28a745;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --radius: 8px;
  --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
  --max-width: 1200px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-surface: #2d2d2d;
    --color-surface-hover: #3a3a3a;
    --color-text: #e9ecef;
    --color-text-secondary: #adb5bd;
    --color-border: #495057;
    --color-primary: #4dabf7;
    --color-primary-hover: #74c0fc;
    --color-accent: #ffd43b;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

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

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  font-size: clamp(16px, 2vw, 18px);
}

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

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--spacing-lg);
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--color-surface);
  border-radius: var(--radius);
}

.hero-badge {
  width: clamp(100px, 12vw, 140px);
  text-align: center;
}

.hero-badge a {
  text-decoration: none;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  transition: transform 0.2s;
}

.hero-badge a:hover {
  transform: translateY(-4px);
  text-decoration: none;
}

.hero-badge img {
  max-width: 100%;
  height: auto;
}

.hero-badge small {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.hero-image {
  width: clamp(80px, 15vw, 150px);
  height: clamp(80px, 15vw, 150px);
  border-radius: 50%;
  object-fit: cover;
}

.hero-content h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.hero-content .tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.hero-content .location {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

/* Call to Action */
.cta {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  margin: var(--spacing-xl) 0;
  box-shadow: var(--shadow);
}

.cta h2 {
  font-size: clamp(1.3rem, 2.5vw, 1.75rem);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.cta-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.cta-header h2 {
  margin-bottom: 0;
}

.cta-content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-lg);
  align-items: center;
}

.cta-text p {
  font-size: clamp(0.95rem, 1.8vw, 1.05rem);
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.5;
}

.cta-subtitle {
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-text);
}

.cta-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.cta-list li {
  padding: var(--spacing-xs) 0;
  padding-left: var(--spacing-md);
  position: relative;
}

.cta-list li .bullet {
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

.linkedin-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: #0077b5;
  color: white;
  padding: 12px 24px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: background 0.2s;
  white-space: nowrap;
  min-height: 44px;
}

.linkedin-button:hover {
  background: #006399;
  color: white;
  text-decoration: none;
}

.linkedin-button svg {
  width: 20px;
  height: 20px;
  fill: white;
}

/* Value Proposition */
.value-prop {
  background: var(--color-surface);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-primary);
  margin-bottom: var(--spacing-xl);
}

.value-prop p {
  margin-bottom: var(--spacing-sm);
}

.value-prop p:last-child {
  margin-bottom: 0;
}

.value-prop strong {
  color: var(--color-primary);
}

/* Sections */
section {
  margin-bottom: var(--spacing-xl);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

h3 {
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

h4 {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
  font-size: 1rem;
}

/* Expertise Grid */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.expertise-grid.no-margin {
  margin-bottom: 0;
}

.expertise-card {
  background: var(--color-surface);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.expertise-card h3 {
  margin-bottom: var(--spacing-sm);
}

.expertise-card ul {
  list-style: none;
  padding-left: 0;
}

.expertise-card li {
  padding: var(--spacing-xs) 0;
  padding-left: var(--spacing-md);
  position: relative;
}

.expertise-card li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.expertise-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.expertise-list li {
  padding: 2px 0;
  font-size: 0.9rem;
}

mark {
  background: var(--color-accent);
  color: var(--color-text);
  padding: 2px 6px;
  border-radius: 3px;
}

/* Certification Timeline */
.timeline {
  position: relative;
  padding: var(--spacing-md) 0;
}

.timeline-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  position: relative;
}

.timeline-year {
  font-weight: 600;
  color: var(--color-primary);
  text-align: right;
}

.timeline-content {
  padding-left: var(--spacing-md);
  border-left: 2px solid var(--color-border);
  padding-bottom: var(--spacing-sm);
}

.timeline-content::before {
  content: "";
  position: absolute;
  left: 80px;
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  margin-left: calc(var(--spacing-md) - 7px);
}

/* Badges */
.badge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 150px));
  gap: var(--spacing-md);
  justify-content: center;
  margin: var(--spacing-lg) 0;
}

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

.badge-item a {
  text-decoration: none;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  transition: transform 0.2s;
}

.badge-item a:hover {
  transform: translateY(-4px);
}

.badge-item img {
  max-width: 100%;
  height: auto;
}

.badge-item small {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* Learning Section */
.learning-highlight {
  background: linear-gradient(
    135deg,
    rgba(0, 102, 204, 0.1),
    rgba(0, 102, 204, 0.05)
  );
  padding: var(--spacing-md);
  border-radius: var(--radius);
  border-left: 4px solid var(--color-success);
  margin: var(--spacing-lg) 0;
}

.learning-highlight h3 {
  color: var(--color-success);
  margin-bottom: var(--spacing-sm);
}

/* Certifications List */
.cert-header {
  margin-bottom: var(--spacing-lg);
}

.cert-header h2 {
  margin-bottom: var(--spacing-xs);
}

.cert-header p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin: 0;
}

.cert-header a {
  color: var(--color-text-secondary);
}

.cert-category {
  margin-bottom: var(--spacing-lg);
}

.cert-category h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--color-border);
}

.cert-category ul {
  list-style: none;
  padding-left: 0;
}

.cert-category li {
  padding: var(--spacing-xs) 0;
  padding-left: var(--spacing-md);
  position: relative;
}

.cert-category li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: bold;
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Footer */
footer {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

footer nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm) var(--spacing-md);
  justify-content: center;
}

footer nav a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.strikethrough {
  text-decoration: line-through;
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }

  .hero-image {
    grid-row: 1;
  }

  .hero-content {
    grid-row: 2;
  }

  .hero-badge {
    grid-row: 3;
    margin-top: var(--spacing-md);
    margin-bottom: 0;
  }

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

  .cta-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .cta-header {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
  }

  .cta-header h2 {
    margin-bottom: 0;
  }

  .linkedin-button {
    justify-content: center;
    width: 100%;
    max-width: 300px;
  }

  .timeline-item {
    grid-template-columns: 60px 1fr;
  }

  .badge-grid {
    grid-template-columns: repeat(auto-fit, minmax(100px, 120px));
  }

  footer nav ul {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: var(--spacing-sm);
  }

  .hero,
  .value-prop,
  .cta {
    padding: var(--spacing-md);
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .timeline-year {
    text-align: left;
  }
}