/* ============================================
   CSS Variables & Theme
   ============================================ */
:root {
  --primary: #0a0a0a;
  --primary-light: #111111;
  --primary-lighter: #1a1a1a;
  --secondary: #64ffda;
  --secondary-dim: rgba(100, 255, 218, 0.1);
  --text-primary: #d4d4d8;
  --text-secondary: #a1a1aa;
  --text-dim: #52525b;
  --accent: #ff6b6b;
  --white: #e4e4e7;
  --bg: #080808;
  --bg-card: #121212;
  --bg-card-hover: #1c1c1c;
  --border: #27272a;
  --shadow: rgba(0, 0, 0, 0.7);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'SF Mono', 'Fira Code', monospace;
  --transition: all 0.3s ease-in-out;
  --max-width: 1200px;
  --nav-height: 70px;
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background: var(--secondary);
  color: var(--primary);
}

a {
  color: var(--secondary);
  text-decoration: none;
  transition: var(--transition);
}
a:hover {
  color: var(--white);
}

ul {
  list-style: none;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section-alt {
  background: var(--primary-light);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--white);
  text-align: center;
  margin-bottom: 8px;
  font-family: var(--font-sans);
}

.section-divider {
  width: 60px;
  height: 4px;
  background: var(--secondary);
  margin: 0 auto 48px;
  border-radius: 2px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(8, 8, 8, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(8, 8, 8, 0.95);
  box-shadow: 0 10px 30px -10px var(--shadow);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary);
  letter-spacing: -0.5px;
}
.nav-logo:hover {
  color: var(--secondary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  padding: 8px 14px;
  border-radius: 4px;
  transition: var(--transition);
  position: relative;
}
.nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--secondary);
  transition: var(--transition);
}
.nav-link:hover::before,
.nav-link.active::before {
  width: 60%;
}
.nav-link:hover {
  color: var(--secondary);
  background: var(--secondary-dim);
}
.nav-link.active {
  color: var(--secondary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at 80% 50%, rgba(100, 255, 218, 0.04) 0%, transparent 50%),
              radial-gradient(ellipse at 20% 80%, rgba(100, 255, 218, 0.02) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  width: 100%;
}

.hero-text {
  animation: fadeInUp 0.8s ease forwards;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--secondary);
  margin-bottom: 12px;
}

.hero-name {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 8px;
  letter-spacing: -1px;
}

.hero-title {
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.hero-tagline {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 32px;
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: var(--secondary);
  color: var(--primary);
  border-color: var(--secondary);
}
.btn-primary:hover {
  background: transparent;
  color: var(--secondary);
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(100, 255, 218, 0.2);
}

.btn-outline {
  background: transparent;
  color: var(--secondary);
  border-color: var(--secondary);
}
.btn-outline:hover {
  background: var(--secondary-dim);
  color: var(--secondary);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--text-dim);
}
.btn-secondary:hover {
  border-color: var(--secondary);
  color: var(--secondary);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.78rem;
  background: transparent;
  color: var(--secondary);
  border-color: var(--secondary);
}
.btn-sm:hover {
  background: var(--secondary-dim);
}

.hero-socials {
  display: flex;
  gap: 20px;
}
.hero-socials a {
  font-size: 1.3rem;
  color: var(--text-secondary);
  transition: var(--transition);
}
.hero-socials a:hover {
  color: var(--secondary);
  transform: translateY(-3px);
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-img-placeholder {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  border: 3px solid var(--secondary);
  object-fit: cover;
  box-shadow: 0 0 40px rgba(100, 255, 218, 0.1);
  animation: float 6s ease-in-out infinite;
}

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

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1rem;
}

.about-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.about-item {
  background: var(--bg-card);
  padding: 24px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.about-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(23, 111, 122, 0.4);
}

.about-item h3 {
  font-size: 1rem;
  color: var(--secondary);
  margin-bottom: 12px;
  font-family: var(--font-mono);
}
.about-item h3 i {
  margin-right: 8px;
}
.about-item p {
  margin-bottom: 6px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.about-item strong {
  color: var(--white);
}

/* ============================================
   Research Interests
   ============================================ */
.interests-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  max-width: 1000px;
  margin: 0 auto;
}

.interest-card {
  background: var(--bg-card);
  padding: 14px 18px;
  border-radius: 8px;
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
  flex: 0 0 auto;
  position: relative;
  overflow: hidden;
}
.interest-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 8px;
  background: radial-gradient(circle at 50% 0%, var(--secondary-dim), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}
.interest-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(23, 111, 122, 0.4);
}
.interest-card:hover::before {
  opacity: 1;
}
.interest-card:hover .interest-icon {
  transform: scale(1.25) rotate(-8deg);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.interest-icon {
  font-size: 1.2rem;
  color: var(--secondary);
  margin-bottom: 6px;
  transition: transform 0.3s ease;
}

.interest-card h3 {
  font-size: 0.78rem;
  color: var(--text-primary);
  font-weight: 500;
  font-family: var(--font-mono);
}

/* ============================================
   Skills
   ============================================ */
.skills-content {
  max-width: 800px;
  margin: 0 auto;
}

.skill-category {
  margin-bottom: 32px;
}

.skill-category:last-child {
  margin-bottom: 0;
}

.skill-category h3 {
  font-size: 1rem;
  color: var(--secondary);
  margin-bottom: 14px;
  font-family: var(--font-mono);
}
.skill-category h3 i {
  margin-right: 8px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tags span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-primary);
  background: var(--bg-card);
  padding: 6px 14px;
  border-radius: 4px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.skill-tags span:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(23, 111, 122, 0.4);
}

/* ============================================
   Projects
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.project-card {
  background: var(--bg-card);
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(100, 255, 218, 0.06), transparent 50%);
  opacity: 0;
  transition: opacity 0.4s ease;
  border-radius: 8px;
  pointer-events: none;
}
.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(23, 111, 122, 0.4);
}
.project-card:hover::before {
  opacity: 1;
}
.project-card:hover .project-info h3 {
  color: var(--secondary);
  transition: color 0.3s ease;
}
.project-card:last-child {
  grid-column: 1 / -1;
  max-width: calc(50% - 10px);
  width: 100%;
  justify-self: center;
}

.project-card .ml-project-icon {
  font-size: 1.5rem;
  color: var(--secondary);
  margin-bottom: 10px;
}

.project-info {
  padding: 0;
}

.project-info h3 {
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 8px;
  line-height: 1.4;
  transition: color 0.3s ease;
}

.project-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.project-desc.expanded {
  -webkit-line-clamp: unset;
}

.see-more-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--secondary);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  margin-bottom: 12px;
  display: inline-block;
  transition: var(--transition);
}
.see-more-btn:hover {
  color: var(--white);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.project-tech span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--secondary);
  background: var(--secondary-dim);
  padding: 4px 10px;
  border-radius: 3px;
}

.project-links {
  display: flex;
  gap: 12px;
}

/* ============================================
   Applied ML Projects
   ============================================ */
.ml-projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.ml-project-card {
  background: var(--bg-card);
  padding: 20px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.ml-project-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(100, 255, 218, 0.04) 50%, transparent 60%);
  opacity: 0;
  transition: opacity 0.5s ease, transform 0.5s ease;
  pointer-events: none;
}
.ml-project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(23, 111, 122, 0.4);
}
.ml-project-card:hover::after {
  opacity: 1;
  transform: translate(25%, 25%);
}
.ml-project-card:hover .ml-project-icon {
  animation: iconBounce 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.ml-project-icon {
  font-size: 1.5rem;
  color: var(--secondary);
  margin-bottom: 10px;
}

.ml-project-card h3 {
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 4px;
  transition: color 0.3s ease;
}

.ml-project-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.ml-project-card .project-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.ml-project-card .project-desc.expanded {
  -webkit-line-clamp: unset;
}

/* ============================================
   Timeline (Experience)
   ============================================ */
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-left: 48px;
  padding-bottom: 28px;
}
.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: 8px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--secondary);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.timeline-content {
  background: var(--bg-card);
  padding: 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
}
.timeline-content::before {
  content: '';
  position: absolute;
  left: -1px;
  top: 0;
  width: 2px;
  height: 0;
  background: var(--secondary);
  transition: height 0.4s ease;
  border-radius: 0 1px 1px 0;
}
.timeline-content:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(23, 111, 122, 0.4);
}
.timeline-content:hover::before {
  height: 100%;
}
.timeline-content:hover h3 {
  color: var(--secondary);
  transition: color 0.3s ease;
}
.timeline-item:hover .timeline-dot {
  transform: scale(1.4);
  box-shadow: 0 0 18px rgba(100, 255, 218, 0.4);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.timeline-header h3 {
  font-size: 0.95rem;
  color: var(--white);
  transition: color 0.3s ease;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--secondary);
  white-space: nowrap;
}

.timeline-org {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}



.timeline-org {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.timeline-content ul {
  padding-left: 0;
}

.timeline-content ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.timeline-content ul li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--secondary);
}

/* ============================================
   Publications
   ============================================ */
.publications-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.publication-card {
  display: flex;
  gap: 20px;
  background: var(--bg-card);
  padding: 24px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.publication-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 0;
  background: var(--secondary);
  transition: height 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  border-radius: 0 3px 3px 0;
}
.publication-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(23, 111, 122, 0.4);
}
.publication-card:hover::before {
  height: 100%;
}
.publication-card:hover .pub-icon {
  transform: scale(1.15);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.pub-icon {
  font-size: 1.5rem;
  color: var(--secondary);
  flex-shrink: 0;
  padding-top: 4px;
  transition: transform 0.3s ease;
}

.pub-content h3 {
  font-size: 1rem;
  color: var(--white);
  margin-bottom: 8px;
  line-height: 1.5;
}

.pub-authors {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.pub-authors strong {
  color: var(--secondary);
}

.pub-venue {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 12px;
}

/* ============================================
   Achievements
   ============================================ */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  max-width: 700px;
  margin: 0 auto;
}

.achievement-card {
  background: var(--bg-card);
  padding: 28px;
  border-radius: 8px;
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.achievement-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(255, 215, 0, 0.06), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s ease;
  border-radius: 8px;
  pointer-events: none;
}
.achievement-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(23, 111, 122, 0.4);
}
.achievement-card:hover::before {
  opacity: 1;
}
.achievement-card:hover .achievement-icon {
  transform: scale(1.3) rotateY(180deg);
  transition: transform 0.5s ease;
}

.achievement-icon {
  font-size: 2rem;
  color: #ffd700;
  margin-bottom: 12px;
  transition: transform 0.3s ease;
}

.achievement-card h3 {
  font-size: 1.1rem;
  color: var(--white);
  margin-bottom: 8px;
}

.achievement-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.achievement-org {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--secondary);
}

/* ============================================
   Contact
   ============================================ */
.contact-content {
  max-width: 1000px;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--bg-card);
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: var(--transition);
  flex: 0 0 auto;
}
.contact-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 20px rgba(23, 111, 122, 0.4);
}

.contact-item i {
  font-size: 1rem;
  color: var(--secondary);
  width: 18px;
  text-align: center;
}

.contact-item a, .contact-item span {
  color: var(--text-secondary);
  font-size: 0.82rem;
  white-space: nowrap;
}
.contact-item a:hover {
  color: var(--secondary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--primary-light);
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-links h4 {
  font-size: 0.9rem;
  color: var(--white);
  margin-bottom: 12px;
  text-align: center;
}

.footer-links ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.footer-links ul li a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.footer-links ul li a:hover {
  color: var(--secondary);
}

.footer-socials {
  display: flex;
  gap: 20px;
}

.footer-socials a {
  font-size: 1.2rem;
  color: var(--text-secondary);
  transition: var(--transition);
}
.footer-socials a:hover {
  color: var(--secondary);
  transform: translateY(-3px);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  width: 100%;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer-bottom .fa-heart {
  color: var(--accent);
}

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

@keyframes iconBounce {
  0% { transform: scale(1) rotate(0deg); }
  40% { transform: scale(1.3) rotate(-10deg); }
  70% { transform: scale(0.95) rotate(3deg); }
  100% { transform: scale(1) rotate(0deg); }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Responsive - Tablet & Mobile
   ============================================ */
@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-image {
    order: -1;
  }

  .hero-img-placeholder {
    width: 220px;
    height: 220px;
  }

  .hero-tagline {
    margin: 0 auto 32px;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-socials {
    justify-content: center;
  }

  .hero-name {
    font-size: 2.8rem;
  }

  .hero-title {
    font-size: 1.3rem;
  }

  .section-title {
    font-size: 1.7rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: rgba(8, 8, 8, 0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 24px;
    gap: 4px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    border-bottom: 1px solid var(--border);
  }

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

  .nav-link {
    width: 100%;
    text-align: center;
    padding: 14px;
    font-size: 0.9rem;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-name {
    font-size: 2.2rem;
  }

  .hero-title {
    font-size: 1.1rem;
  }

  .hero-tagline {
    font-size: 0.9rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .about-details {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }
  .project-card:last-child {
    grid-column: auto;
    max-width: none;
    justify-self: auto;
  }

  .ml-projects-grid {
    grid-template-columns: 1fr;
  }

  .contact-item a, .contact-item span {
    white-space: normal;
  }

  .interests-grid {
    gap: 8px;
  }

  .publication-card {
    flex-direction: column;
    gap: 12px;
  }

  .timeline-header {
    flex-direction: column;
  }

  .section {
    padding: 70px 0;
  }

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

@media (max-width: 480px) {
  .hero-name {
    font-size: 1.8rem;
  }

  .hero-img-placeholder {
    width: 160px;
    height: 160px;
  }

  .hero-title {
    font-size: 1rem;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .skill-tags {
    gap: 6px;
  }

  .skill-tags span {
    font-size: 0.72rem;
    padding: 4px 10px;
  }
}