/* Optimized Data Science Portfolio */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --accent: #06b6d4;
  --success: #10b981;
  --danger: #ef4444;
  --dark: #0f172a;
  --light: #f8fafc;
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --border-radius: 0.75rem;
  --border-radius-sm: 0.375rem;
  --border-radius-lg: 1rem;
  --border-radius-xl: 1.5rem;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--gray-800);
  background: var(--white);
  overflow-x: hidden;
  width: 100%;
  max-width: 100vw;
}

img, picture, video {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 2.5vw, 2rem);
  width: 100%;
  box-sizing: border-box;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--gray-200);
  transition: var(--transition);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 2.5vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
  width: 100%;
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-subtitle {
  font-size: 0.75rem;
  color: var(--gray-500);
  font-weight: 500;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--gray-700);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-sm);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: rgba(37, 99, 235, 0.05);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  gap: 0.25rem;
}

.hamburger {
  width: 1.5rem;
  height: 2px;
  background: var(--gray-700);
  border-radius: 1px;
  transition: var(--transition);
}

/* Hero Section */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="grad" cx="50%" cy="50%"><stop offset="0%" stop-color="%232563eb" stop-opacity="0.05"/><stop offset="100%" stop-color="%2306b6d4" stop-opacity="0.02"/></radialGradient></defs><rect width="100%" height="100%" fill="url(%23grad)"/></svg>');
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(0.5deg); }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
  padding: 6rem 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--gradient-primary);
  color: var(--white);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.title-line {
  display: block;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 3vw, 1.5rem);
  color: var(--gray-600);
  margin-bottom: 2rem;
  max-width: 600px;
  line-height: 1.5;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
}

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

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--gray-500);
  font-weight: 500;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--gradient-primary);
  color: var(--white);
  padding: 0.875rem 1.5rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.875rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--white);
  color: var(--gray-700);
  padding: 0.875rem 1.5rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.875rem;
  border: 2px solid var(--gray-200);
  transition: var(--transition);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.social-proof {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.social-links {
  display: flex;
  gap: 1rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--white);
  color: var(--gray-600);
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

.social-link:hover {
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.location {
  font-size: 0.875rem;
  color: var(--gray-500);
}

.profile-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.profile-image {
  width: clamp(250px, 25vw, 350px);
  height: clamp(250px, 25vw, 350px);
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-xl);
  border: 4px solid var(--white);
  position: relative;
  z-index: 2;
}

/* Desktop and laptop views - larger image */
@media (min-width: 769px) {
  .profile-image {
    width: clamp(350px, 30vw, 450px);
    height: clamp(350px, 30vw, 450px);
  }
}

.profile-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  width: calc(100% + 3rem);
  height: calc(100% + 3rem);
  transform: translate(-50%, -50%);
  border: 3px solid var(--primary);
  border-radius: 50%;
  opacity: 0.6;
  animation: rotate 8s linear infinite;
  will-change: transform;
  box-shadow: 0 0 20px rgba(37, 99, 235, 0.3);
}

/* Desktop and laptop views - larger radius and thicker ring */
@media (min-width: 769px) {
  .profile-ring {
    width: calc(100% + 6rem);
    height: calc(100% + 6rem);
    border-width: 6px;
  }
}

@media (max-width: 768px) {
  .profile-ring {
    width: calc(100% + 1.5rem);
    height: calc(100% + 1.5rem);
    border-width: 2px;
  }
}

@keyframes rotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Sections */
.section {
  padding: 6rem 0;
}

.section:nth-child(even) {
  background: var(--gray-50);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}

/* About Section */
.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.about-text p {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.expertise-areas {
  display: grid;
  grid-template-columns: repeat(3, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
  justify-content: center;
}

.expertise-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.25rem;
  padding: 2rem 1.5rem;
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
  min-height: 200px;
}

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

.expertise-icon {
  font-size: 2.5rem;
  flex-shrink: 0;
}

.expertise-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.expertise-content h4 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.expertise-content p {
  color: var(--gray-600);
  font-size: 0.95rem;
  line-height: 1.5;
  max-width: 450px;
}

/* Skills Section */
.skills-section {
  background: var(--gray-50);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.skill-category {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
}

.skill-category h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 1.5rem;
}

.skills-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.skill-name {
  font-weight: 600;
  color: var(--gray-800);
}

.skill-bar {
  height: 0.5rem;
  background: var(--gray-200);
  border-radius: 0.25rem;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 0.25rem;
  transition: width 2s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0;
}

/* Timeline */
.timeline {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 2rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gray-200);
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
  padding-left: 5rem;
}

.timeline-marker {
  position: absolute;
  left: 1.25rem;
  top: 0.5rem;
  width: 1.5rem;
  height: 1.5rem;
  background: var(--primary);
  border-radius: 50%;
  border: 4px solid var(--white);
  box-shadow: var(--shadow);
}

.timeline-content {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.timeline-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
}

.timeline-date {
  font-size: 0.875rem;
  color: var(--gray-500);
  font-weight: 500;
}

.timeline-company {
  font-size: 1rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 1rem;
}

.timeline-achievements {
  list-style: none;
  margin-bottom: 1.5rem;
}

.timeline-achievements li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--gray-600);
}

.timeline-achievements li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: bold;
}

.timeline-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 500;
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.education-item {
  padding: 1.5rem;
  background: var(--gray-50);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--primary);
}

.education-item h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
}

.education-item p {
  color: var(--gray-600);
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-xl);
}

.project-card.featured {
  grid-column: span 2;
}

.project-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.project-card:hover .project-image img {
  transform: scale(1.1);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.project-image:hover .project-overlay {
  opacity: 1;
}

.project-link {
  background: var(--white);
  color: var(--gray-900);
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.project-link:hover {
  background: var(--primary);
  color: var(--white);
}

.project-content {
  padding: 1.5rem;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  gap: 1rem;
}

.project-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
}

.project-type {
  background: var(--gradient-primary);
  color: var(--white);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

.project-content p {
  color: var(--gray-600);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.project-metrics {
  display: flex;
  gap: 2rem;
  margin-bottom: 1rem;
}

.metric {
  text-align: center;
}

.metric-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--gray-500);
  font-weight: 500;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-tag {
  background: var(--gray-100);
  color: var(--gray-700);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 500;
}

/* Contact Section */
.contact-section {
  background: var(--gray-50);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: clamp(2rem, 4vw, 4rem);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-icon {
  font-size: 1.5rem;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.contact-details h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.25rem;
}

.contact-details a,
.contact-details span {
  color: var(--gray-600);
  text-decoration: none;
}

.contact-details a:hover {
  color: var(--primary);
}

.contact-form {
  background: var(--white);
  padding: 2rem;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 1.5rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
  background: var(--white);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-message {
  display: none;
  margin-top: 1rem;
  padding: 1rem;
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border-radius: var(--border-radius);
  font-weight: 500;
}

/* Footer */
.footer {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: 2rem 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 2rem;
  justify-content: center;
}

.footer-links a {
  color: var(--gray-400);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

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

/* Floating Navigation */
.floating-nav {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: none;
}

/* Show floating nav and hide main nav for all non-desktop devices */
@media (max-width: 1199px) {
  .floating-nav {
    display: block;
  }
  
  .nav-links {
    display: none !important;
  }
  
  .menu-toggle {
    display: none !important;
  }
}

.nav-toggle-btn {
  width: 3.5rem;
  height: 3.5rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(30px) saturate(180%);
  -webkit-backdrop-filter: blur(30px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: rgba(0, 0, 0, 0.8);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.nav-toggle-btn:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.25);
}

.nav-menu {
  position: absolute;
  bottom: 4.5rem;
  right: 0;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(50px) saturate(180%);
  -webkit-backdrop-filter: blur(50px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 1.25rem;
  padding: 0.5rem;
  min-width: 200px;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(15px) scale(0.9);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.nav-menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.nav-menu-item {
  display: block;
  padding: 0.875rem 1.25rem;
  color: rgba(0, 0, 0, 0.9);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 1.5rem;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  margin-bottom: 0.375rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1.5px solid rgba(37, 99, 235, 0.2);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.nav-menu-item:hover {
  background: rgba(37, 99, 235, 0.15);
  color: rgba(37, 99, 235, 1);
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 32px rgba(37, 99, 235, 0.25);
  border-color: rgba(37, 99, 235, 0.7);
}

.nav-menu-item.active {
  background: rgba(37, 99, 235, 0.2);
  color: rgba(37, 99, 235, 1);
  border-color: rgba(37, 99, 235, 0.6);
}

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

/* Certifications Section */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem;
  margin-top: 3rem;
}

.cert-category {
  background: var(--white);
  border-radius: var(--border-radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  border: 1px solid var(--gray-200);
  position: relative;
  overflow: hidden;
}

.cert-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
}

.cert-category:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.cert-category h3 {
  color: var(--gray-900);
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid var(--gray-100);
}

.cert-category {
  display: grid;
  gap: 1.5rem;
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--gray-50);
  border-radius: var(--border-radius-lg);
  transition: var(--transition);
  border: 1px solid var(--gray-200);
}

.cert-item:hover {
  background: var(--white);
  box-shadow: var(--shadow-md);
  transform: translateX(8px);
}

.cert-image {
  width: 250px;
  height: 180px;
  object-fit: cover;
  border-radius: var(--border-radius);
  border: 3px solid var(--white);
  box-shadow: var(--shadow);
  flex-shrink: 0;
}

.cert-content h4 {
  color: var(--gray-900);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.cert-content p {
  color: var(--gray-600);
  font-size: 0.9rem;
  margin: 0;
  font-weight: 500;
}

.cert-skills {
  color: var(--gray-500);
  font-size: 0.8rem;
  font-style: italic;
}

/* Publications Section */
.publications-list {
  display: grid;
  gap: 2rem;
  margin-top: 3rem;
}

.publication-item {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

.publication-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.publication-header h3 {
  color: var(--gray-900);
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.4;
  flex: 1;
}

.publication-type {
  background: var(--primary);
  color: var(--white);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.publication-details {
  margin-bottom: 1rem;
}

.publication-journal {
  color: var(--primary);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.publication-info,
.publication-authors {
  color: var(--gray-600);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.publication-abstract {
  color: var(--gray-700);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.publication-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.keyword-tag {
  background: var(--gray-100);
  color: var(--gray-700);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  border: 1px solid var(--gray-200);
}

.publication-actions {
  display: flex;
  gap: 1rem;
}

.publication-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: 2px solid var(--primary);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.publication-link:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}

/* Large Desktop (1200px+) */
@media (min-width: 1200px) {
  .hero-content {
    gap: 5rem;
  }
  
  .section {
    padding: 8rem 0;
  }
}

/* Desktop/Laptop (992px - 1199px) */
@media (max-width: 1199px) {
  .hero-content {
    gap: 3rem;
  }
  
  .profile-image {
    width: clamp(200px, 20vw, 300px);
    height: clamp(200px, 20vw, 300px);
  }
}

/* Tablet Landscape (768px - 991px) */
@media (max-width: 991px) {
  .nav-links {
    gap: 1.5rem;
  }
  
  .nav-link {
    font-size: 0.8rem;
    padding: 0.4rem 0.8rem;
  }
  
  .hero-content {
    gap: 2rem;
  }
  
  .section {
    padding: 5rem 0;
  }
  
  .expertise-areas {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
  
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .project-card.featured {
    grid-column: span 2;
  }
  
  .certifications-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* Tablet Portrait & Mobile Landscape (768px and below) */
@media (max-width: 768px) {
  .container {
    max-width: none;
    margin: 0;
  }

  .nav-container {
    max-width: none;
    margin: 0;
    padding: 0 1rem;
  }

  .menu-toggle {
    display: none;
  }

  .nav-links {
    position: fixed;
    top: 4rem;
    right: -100%;
    width: min(300px, 80vw);
    height: calc(100vh - 4rem);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding: 2rem 0;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    gap: 0;
    z-index: 1000;
    border-left: 1px solid var(--gray-200);
    overflow-y: auto;
  }

  .nav-links.open {
    right: 0;
  }

  .nav-link {
    width: 100%;
    padding: 1rem 2rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s ease;
    margin: 0.25rem 0;
    border-radius: 0;
  }

  .nav-link:hover {
    background: var(--gray-50);
    padding-left: 2.5rem;
  }

  .nav-link.active {
    background: rgba(37, 99, 235, 0.1);
    position: relative;
    margin: 0.25rem 1rem;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
  }

  .nav-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary);
  }

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

  .menu-toggle.active .hamburger:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active .hamburger:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }

  .hero-section {
    padding-top: 80px;
    min-height: calc(100vh - 80px);
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
    padding: 3rem 0;
  }

  .hero-right {
    order: -1;
  }

  .hero-stats {
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
  }

  .section {
    padding: 3rem 0;
  }

  .section-header {
    margin-bottom: 2.5rem;
  }

  .expertise-areas {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    width: 100%;
  }
  
  .expertise-item {
    padding: 1.5rem;
    flex-direction: row;
    text-align: left;
  }

  .skills-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    width: 100%;
  }
  
  .skill-category {
    padding: 1.5rem;
  }

  .timeline::before {
    left: 1rem;
  }

  .timeline-item {
    padding-left: 3rem;
    margin-bottom: 2rem;
  }
  
  .timeline-content {
    padding: 1.5rem;
  }

  .timeline-marker {
    left: 0.25rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    width: 100%;
  }
  
  .project-content {
    padding: 1.5rem;
  }

  .project-card.featured {
    grid-column: span 1;
  }

  .contact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .contact-form {
    padding: 1.5rem;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
  
  .certifications-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .cert-item {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
    padding: 1rem;
  }
  
  .cert-image {
    width: 180px;
    height: 135px;
    margin: 0 auto;
  }
  
  .publication-item {
    padding: 1.5rem;
  }
}

/* Mobile Portrait (480px and below) */
@media (max-width: 480px) {
  .nav-container {
    padding: 0 0.75rem;
  }
  
  .container {
    padding: 0 0.75rem;
  }

  .nav-links {
    width: min(280px, 90vw);
    padding: 1.5rem 0;
  }
  
  .nav-link {
    padding: 1rem 1.5rem;
    font-size: 0.95rem;
  }

  .hero-content {
    padding: 2rem 0;
    gap: 1.5rem;
  }

  .hero-actions {
    justify-content: center;
    gap: 1rem;
  }

  .btn-primary,
  .btn-secondary {
    justify-content: center;
    padding: 1rem 1.5rem;
    font-size: 0.9rem;
    width: auto;
  }

  .hero-stats {
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
  }
  
  .stat-item {
    min-width: 140px;
  }
  
  .stat-number {
    font-size: 1.75rem;
  }

  .profile-image {
    width: clamp(160px, 45vw, 220px);
    height: clamp(160px, 45vw, 220px);
  }
  
  .section {
    padding: 2.5rem 0;
  }
  
  .section-header {
    margin-bottom: 2rem;
  }
  
  .expertise-areas {
    gap: 1rem;
  }
  
  .expertise-item {
    padding: 1.25rem;
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
  
  .expertise-icon {
    font-size: 1.75rem;
  }
  
  .skill-category {
    padding: 1.25rem;
  }
  
  .timeline-item {
    padding-left: 2.5rem;
    margin-bottom: 1.5rem;
  }
  
  .timeline-content {
    padding: 1.25rem;
  }
  
  .project-content {
    padding: 1.25rem;
  }

  .project-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .project-metrics {
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
  }
  
  .social-links {
    justify-content: center;
  }
  
  .contact-form {
    padding: 1.25rem;
  }
  
  .contact-item {
    gap: 0.75rem;
  }
  
  .cert-image {
    width: 160px;
    height: 120px;
  }
  
  .publication-item {
    padding: 1.25rem;
  }
  
  .footer {
    padding: 1.5rem 0;
  }
}

/* Small Mobile (360px and below) */
@media (max-width: 360px) {
  .nav-container {
    padding: 0 0.5rem;
  }
  
  .container {
    padding: 0 0.5rem;
  }
  
  .logo-text {
    font-size: 1rem;
  }
  
  .logo-subtitle {
    font-size: 0.65rem;
  }
  
  .nav-links {
    width: 95vw;
    padding: 1rem 0;
  }
  
  .nav-link {
    padding: 0.875rem 1rem;
    font-size: 0.9rem;
  }
  
  .hero-badge {
    font-size: 0.75rem;
    padding: 0.375rem 0.75rem;
  }
  
  .hero-content {
    padding: 1.5rem 0;
  }
  
  .section {
    padding: 2rem 0;
  }
  
  .section-header {
    margin-bottom: 1.5rem;
  }
  
  .expertise-areas {
    gap: 0.75rem;
  }
  
  .expertise-item {
    padding: 1rem;
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
  }
  
  .expertise-icon {
    font-size: 1.5rem;
  }
  
  .skill-category {
    padding: 1rem;
  }
  
  .timeline-content {
    padding: 1rem;
  }
  
  .project-content {
    padding: 1rem;
  }
  
  .contact-form {
    padding: 1rem;
  }
  
  .contact-item {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }
  
  .cert-image {
    width: 140px;
    height: 105px;
  }
  
  .publication-item {
    padding: 1rem;
  }
  
  .btn-primary,
  .btn-secondary {
    padding: 0.875rem 1.25rem;
    font-size: 0.85rem;
  }
}

/* Landscape Orientation Adjustments */
@media (max-height: 500px) and (orientation: landscape) {
  .hero-section {
    min-height: auto;
    padding: 2rem 0;
  }
  
  .hero-content {
    padding: 2rem 0;
    gap: 1.5rem;
  }
  
  .profile-image {
    width: clamp(120px, 15vw, 200px);
    height: clamp(120px, 15vw, 200px);
  }
  
  .section {
    padding: 3rem 0;
  }
  
  .nav-links {
    height: calc(100vh - 4rem);
    padding: 1rem 0;
  }
  
  .nav-link {
    padding: 0.75rem 2rem;
  }
}

/* iPad Pro Portrait */
@media (width: 1024px) and (height: 1366px) and (orientation: portrait) {
  html, body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
  }
  
  .container, .nav-container {
    max-width: 100%;
    width: 100%;
    margin: 0;
    padding: 0 2rem;
  }
}

/* iPad Air Portrait */
@media (width: 820px) and (height: 1180px) and (orientation: portrait) {
  html, body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
  }
  
  .container, .nav-container {
    max-width: 100%;
    width: 100%;
    margin: 0;
    padding: 0 2rem;
  }
}

/* iPad Mini Portrait */
@media (width: 768px) and (height: 1024px) and (orientation: portrait) {
  html, body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
  }
  
  .container, .nav-container {
    max-width: 100%;
    width: 100%;
    margin: 0;
    padding: 0 1.5rem;
  }
}

/* iPad Mini Landscape & iPad Air Landscape */
@media (width: 1024px) and (height: 768px) and (orientation: landscape),
       (width: 1180px) and (height: 820px) and (orientation: landscape) {
  html, body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
  }
  
  .container, .nav-container {
    max-width: 100%;
    width: 100%;
    margin: 0;
    padding: 0 2rem;
  }
}

/* iPad Specific Adjustments */
@media (min-width: 768px) and (max-width: 1024px) {
  html, body {
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
  }
  
  .container {
    max-width: 100%;
    width: 100%;
    margin: 0;
    padding: 0 1.5rem;
  }
  
  .nav-container {
    max-width: 100%;
    width: 100%;
    margin: 0;
    padding: 0 1.5rem;
  }
  
  .hero-content {
    gap: 2.5rem;
    width: 100%;
  }
  
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    width: 100%;
  }
  
  .project-card.featured {
    grid-column: span 2;
  }
  
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    width: 100%;
  }
  
  .contact-content {
    grid-template-columns: 1fr 1.2fr;
    width: 100%;
  }
  
  .expertise-areas {
    width: 100%;
  }
  
  .certifications-grid {
    width: 100%;
  }
}

/* Mobile Landscape Optimizations */
@media (max-width: 812px) and (orientation: landscape) {
  .hero-section {
    min-height: 70vh;
    padding-top: 1rem;
    padding-bottom: 1rem;
  }

  .hero-title {
    font-size: clamp(1.2rem, 4vw, 1.8rem);
  }
  
  .hero-subtitle {
    font-size: clamp(0.9rem, 2.5vw, 1.1rem);
  }
  
  .hero-badge {
    font-size: 0.7rem;
    padding: 0.3rem 0.6rem;
  }

  .section {
    padding: 1.5rem 0;
  }
  
  .section-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
  }
  
  .section-subtitle {
    font-size: 0.95rem;
  }
  
  .profile-image {
    width: clamp(120px, 15vw, 180px);
    height: clamp(120px, 15vw, 180px);
  }

  .profile-ring {
    display: none;
  }
  
  .stat-number {
    font-size: 1.3rem;
  }
  
  .stat-label {
    font-size: 0.7rem;
  }
  
  .btn-primary, .btn-secondary {
    padding: 0.6rem 1rem;
    font-size: 0.8rem;
  }
  
  .expertise-item {
    padding: 1rem;
    min-height: 140px;
  }
  
  .expertise-icon {
    font-size: 1.5rem;
  }
  
  .expertise-content h4 {
    font-size: 1rem;
  }
  
  .expertise-content p {
    font-size: 0.85rem;
  }
  
  .skill-category {
    padding: 1rem;
  }
  
  .skill-category h3 {
    font-size: 1rem;
  }
  
  .timeline-content {
    padding: 1rem;
  }
  
  .timeline-header h3 {
    font-size: 1rem;
  }
  
  .project-content {
    padding: 1rem;
  }
  
  .project-header h3 {
    font-size: 1rem;
  }
  
  .contact-form {
    padding: 1rem;
  }
  
  .cert-image {
    width: 120px;
    height: 90px;
  }
  
  .navbar {
    display: none;
  }
  
  .nav-menu {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.25rem;
    min-width: 280px;
  }
  
  .nav-menu-item {
    margin-bottom: 0.25rem;
  }
}

/* Mobile Portrait Adjustments */
@media (max-width: 480px) {
  .nav-container {
    padding: 0 0.75rem;
  }
  
  .container {
    padding: 0 0.75rem;
  }

  .hero-content {
    padding: 2rem 0;
    gap: 1.5rem;
  }

  .hero-actions {
    justify-content: center;
    gap: 1rem;
  }

  .btn-primary,
  .btn-secondary {
    justify-content: center;
    padding: 1rem 1.5rem;
    font-size: 0.9rem;
    width: auto;
  }

  .hero-stats {
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
  }
  
  .stat-item {
    min-width: 140px;
  }
  
  .stat-number {
    font-size: 1.75rem;
  }

  .profile-image {
    width: clamp(160px, 45vw, 220px);
    height: clamp(160px, 45vw, 220px);
  }
  
  .section {
    padding: 2.5rem 0;
  }
  
  .section-header {
    margin-bottom: 2rem;
  }
  
  .expertise-areas {
    gap: 1rem;
  }
  
  .expertise-item {
    padding: 1.25rem;
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
  
  .expertise-icon {
    font-size: 1.75rem;
  }
  
  .skill-category {
    padding: 1.25rem;
  }
  
  .timeline-item {
    padding-left: 2.5rem;
    margin-bottom: 1.5rem;
  }
  
  .timeline-content {
    padding: 1.25rem;
  }
  
  .project-content {
    padding: 1.25rem;
  }

  .project-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .project-metrics {
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
  }
  
  .social-links {
    justify-content: center;
  }
  
  .contact-form {
    padding: 1.25rem;
  }
  
  .contact-item {
    gap: 0.75rem;
  }
  
  .cert-image {
    width: 160px;
    height: 120px;
  }
  
  .publication-item {
    padding: 1.25rem;
  }
  
  .footer {
    padding: 1.5rem 0;
  }
}

/* Accessibility */
:focus {
  outline: none;
}

.nav-toggle-btn:focus, .btn-primary:focus, .btn-secondary:focus, .nav-link:focus {
  box-shadow: 0 0 0 4px rgba(37,99,235,0.12);
  border-radius: 0.5rem;
}

/* Touch targets */
.nav-link, .nav-toggle-btn, .social-link, .btn-primary, .btn-secondary {
  -webkit-tap-highlight-color: rgba(0,0,0,0);
  touch-action: manipulation;
}

/* Advanced Animations & Visual Effects */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease-out;
}

.fade-in-left {
  animation: fadeInLeft 0.6s ease-out;
}

.fade-in-right {
  animation: fadeInRight 0.6s ease-out;
}

.scale-in {
  animation: scaleIn 0.5s ease-out;
}

.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

/* Interactive Timeline */
.timeline-item {
  opacity: 0;
  transform: translateX(-50px);
  transition: all 0.6s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.timeline-item:nth-child(even) {
  transform: translateX(50px);
}

.timeline-item:nth-child(even).visible {
  transform: translateX(0);
}

.timeline-marker {
  transition: all 0.3s ease;
}

.timeline-item:hover .timeline-marker {
  transform: scale(1.2);
  box-shadow: 0 0 20px rgba(37, 99, 235, 0.4);
}

/* Performance Optimizations */
.gpu-accelerated {
  transform: translateZ(0);
  will-change: transform;
}

.reduce-motion {
  animation: none !important;
  transition: none !important;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* Device-Specific Optimizations */

/* iPhone 14 Pro Max (430x932) */
@media (max-width: 430px) and (max-height: 932px) {
  .hero-stats {
    flex-direction: row;
    justify-content: space-between;
    gap: 1rem;
  }
  
  .stat-item {
    min-width: auto;
    flex: 1;
  }
}

/* iPhone SE (375x667) and similar small screens */
@media (max-width: 375px) and (max-height: 667px) {
  .hero-title {
    font-size: clamp(1.5rem, 7vw, 2rem);
  }
  
  .hero-subtitle {
    font-size: 0.9rem;
  }
  
  .section {
    padding: 1.5rem 0;
  }
}

/* Foldable phones (280px width when folded) */
@media (max-width: 280px) {
  .container {
    padding: 0 0.5rem;
  }
  
  .hero-title {
    font-size: 1.2rem;
  }
  
  .btn-primary, .btn-secondary {
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
  }
}

/* Ultra-wide screens (21:9 aspect ratio) */
@media (min-aspect-ratio: 21/9) {
  .hero-content {
    max-width: 1400px;
    margin: 0 auto;
  }
}

/* Very tall screens (portrait tablets) */
@media (min-height: 1200px) and (orientation: portrait) {
  .section {
    padding: 6rem 0;
  }
  
  .hero-section {
    min-height: 80vh;
  }
}

/* Short landscape screens */
@media (max-height: 500px) and (orientation: landscape) and (min-width: 800px) {
  .hero-section {
    min-height: 100vh;
    padding: 1rem 0;
  }
  
  .hero-content {
    padding: 1rem 0;
    gap: 2rem;
  }
  
  .section {
    padding: 2rem 0;
  }
  
  .profile-image {
    width: clamp(120px, 20vw, 200px);
    height: clamp(120px, 20vw, 200px);
  }
}

/* Fix for horizontal overflow on all devices */
@media (max-width: 100vw) {
  html, body {
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
  }
  
  * {
    max-width: 100%;
    box-sizing: border-box;
  }
  
  .hero-content,
  .skills-grid,
  .projects-grid,
  .certifications-grid,
  .expertise-areas {
    width: 100%;
    max-width: 100%;
  }
}

/* Ensure proper spacing on all mobile devices */
@media (max-width: 768px) {
  .container {
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
  }
  
  .nav-container {
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
  }
}

/* Notch and safe area support */
body {
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .profile-image {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* Accessibility - Large text support */
@media (prefers-contrast: high) {
  .nav-link {
    border: 2px solid transparent;
  }
  
  .nav-link:focus {
    border-color: var(--primary);
  }
}

/* Print styles */
@media print {
  .navbar,
  .floating-nav,
  .hero-bg {
    display: none;
  }
  
  .section {
    page-break-inside: avoid;
    padding: 1rem 0;
  }
}

/* iPad Portrait Views - Larger Image and Ring */
@media (min-width: 768px) and (max-width: 1024px) and (orientation: portrait) {
  .profile-image {
    width: clamp(300px, 35vw, 400px);
    height: clamp(300px, 35vw, 400px);
  }
  
  .profile-ring {
    width: calc(100% + 7rem);
    height: calc(100% + 7rem);
    border-width: 7px;
  }
}

/* iPad Landscape Views - Bigger Image and Move Left */
@media (min-width: 768px) and (max-width: 1024px) and (orientation: landscape) {
  .hero-content {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
  
  .hero-right {
    justify-self: start;
    order: -1;
  }
  
  .profile-container {
    justify-content: flex-start;
    margin-left: -2rem;
  }
  
  .profile-image {
    width: clamp(280px, 40vw, 350px);
    height: clamp(280px, 40vw, 350px);
  }
  
  .profile-ring {
    width: calc(100% + 6rem);
    height: calc(100% + 6rem);
    border-width: 6px;
  }
}