/* Base Styles & Variables */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --bg-primary: #0a0e1a;
  --bg-secondary: #141824;
  --bg-tertiary: #1a1f2e;
  --accent: #00d4ff;
  --accent-secondary: #ff006e;
  --accent-hover: #00b8e6;
  --text-primary: #ffffff;
  --text-secondary: #b4b8c5;
  --text-muted: #6b7280;
  --border: rgba(255, 255, 255, 0.08);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #0066ff 100%);
  --gradient-secondary: linear-gradient(135deg, #ff006e 0%, #ff4d00 100%);
  --gradient-text: linear-gradient(135deg, #00d4ff 0%, #0099ff 50%, #00d4ff 100%);
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.3);
  --shadow-glow-pink: 0 0 40px rgba(255, 0, 110, 0.3);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Typography */
body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Playfair Display', serif;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  margin-bottom: 1.5rem;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  margin-bottom: 1rem;
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-fast);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Section */
.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

.section-alt {
  background: linear-gradient(
    180deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 50%,
    var(--bg-primary) 100%
  );
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  position: relative;
  display: inline-block;
  left: 50%;
  transform: translateX(-50%);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -1rem;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.5rem 0;
  background: transparent;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  padding: 1rem 0;
  background: rgba(10, 14, 26, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

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

.logo {
  font-family: 'Playfair Display', serif;
  font-size: 1.75rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-fast);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.language-selector {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-tertiary);
  padding: 0.5rem;
  border-radius: 100px;
  border: 1px solid var(--border);
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 100px;
  cursor: pointer;
  transition: var(--transition-fast);
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.active {
  background: var(--gradient-primary);
  color: var(--bg-primary);
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 120px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: float 20s ease-in-out infinite;
}

.orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #00d4ff 0%, transparent 70%);
  top: -300px;
  right: -200px;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #ff006e 0%, transparent 70%);
  bottom: -250px;
  left: -150px;
  animation-delay: -10s;
}

.orb-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #0066ff 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -5s;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(30px, -30px) scale(1.1);
  }
  66% {
    transform: translate(-20px, 20px) scale(0.9);
  }
}

.hero-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  animation: fadeInUp 1s ease-out;
}

.tagline {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.tagline-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.2);
  }
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.hero h1 {
  margin-bottom: 1.5rem;
}

.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% auto;
  animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
  to {
    background-position: 200% center;
  }
}

.description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 600px;
  margin-bottom: 2.5rem;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: 100px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 2px solid transparent;
}

.btn i {
  width: 20px;
  height: 20px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--bg-primary);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
}

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

.btn-secondary:hover {
  border-color: var(--accent);
  background: rgba(0, 212, 255, 0.1);
}

/* Hero Card */
.hero-card {
  position: relative;
  background: linear-gradient(
    135deg,
    rgba(26, 31, 46, 0.8) 0%,
    rgba(20, 24, 36, 0.8) 100%
  );
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  border: 1px solid var(--border);
  backdrop-filter: blur(20px);
  animation: fadeInUp 1s ease-out 0.3s both;
}

.card-glow {
  position: absolute;
  inset: -2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  opacity: 0;
  filter: blur(20px);
  transition: opacity var(--transition-base);
  z-index: -1;
}

.hero-card:hover .card-glow {
  opacity: 0.3;
}

.hero-photo-wrapper {
  width: 200px;
  height: 200px;
  margin: 0 auto 2rem;
  border-radius: 50%;
  position: relative;
  overflow: hidden;
}

.hero-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.photo-ring {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 3px solid transparent;
  background: var(--gradient-primary);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  padding: 4px;
  animation: rotate 4s linear infinite;
}

@keyframes rotate {
  to {
    transform: rotate(360deg);
  }
}

.hero-meta {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.meta-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.meta-item i {
  width: 24px;
  height: 24px;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 0.25rem;
}

.meta-item > div {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.meta-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.meta-value {
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 600;
}

/* About Section */
.section-content {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: start;
}

.intro-text {
  font-size: 1.25rem;
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.description-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.info-cards {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.info-card {
  background: linear-gradient(
    135deg,
    rgba(26, 31, 46, 0.6) 0%,
    rgba(20, 24, 36, 0.6) 100%
  );
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-base);
}

.info-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.card-icon i {
  width: 24px;
  height: 24px;
  color: var(--bg-primary);
}

.info-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.info-card li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding-left: 1.5rem;
  position: relative;
}

.info-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

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

.achievement-card {
  position: relative;
  background: linear-gradient(
    135deg,
    rgba(26, 31, 46, 0.6) 0%,
    rgba(20, 24, 36, 0.6) 100%
  );
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  transition: all var(--transition-base);
  overflow: hidden;
}

.achievement-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.achievement-card:hover::before {
  transform: scaleX(1);
}

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

.achievement-number {
  font-family: 'Playfair Display', serif;
  font-size: 4rem;
  font-weight: 900;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 1rem;
  opacity: 0.3;
}

.achievement-card h3 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.achievement-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2.5rem;
}

.project-card {
  background: linear-gradient(
    135deg,
    rgba(26, 31, 46, 0.6) 0%,
    rgba(20, 24, 36, 0.6) 100%
  );
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.project-image-wrapper {
  position: relative;
  width: 100%;
  height: 250px;
  overflow: hidden;
  background: var(--bg-tertiary);
}

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

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

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(10, 14, 26, 0.9) 0%,
    transparent 100%
  );
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.project-link {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.project-link:hover {
  transform: scale(1.1);
}

.project-link i {
  width: 24px;
  height: 24px;
  color: var(--bg-primary);
}

.project-content {
  padding: 2rem;
}

.project-content h3 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.project-content p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.project-tech {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 500;
}

.project-tech i {
  width: 18px;
  height: 18px;
}

/* Publications Timeline */
.timeline {
  position: relative;
  padding-left: 3rem;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    var(--accent) 10%,
    var(--accent) 90%,
    transparent 100%
  );
}

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

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

.timeline-marker {
  position: absolute;
  left: -3rem;
  top: 0.5rem;
  width: 16px;
  height: 16px;
  background: var(--gradient-primary);
  border-radius: 50%;
  border: 3px solid var(--bg-primary);
  box-shadow: var(--shadow-glow);
}

.timeline-content {
  background: linear-gradient(
    135deg,
    rgba(26, 31, 46, 0.6) 0%,
    rgba(20, 24, 36, 0.6) 100%
  );
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-base);
}

.timeline-content:hover {
  transform: translateX(8px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.timeline-content h3 {
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.timeline-content p {
  color: var(--text-secondary);
  margin: 0;
}

/* Contact */
.contact-content {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem;
  background: linear-gradient(
    135deg,
    rgba(26, 31, 46, 0.6) 0%,
    rgba(20, 24, 36, 0.6) 100%
  );
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.contact-link:hover {
  border-color: var(--accent);
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon i {
  width: 24px;
  height: 24px;
  color: var(--bg-primary);
}

.contact-link span {
  flex: 1;
  font-weight: 600;
  color: var(--text-primary);
}

.contact-link .arrow {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  transition: transform var(--transition-fast);
}

.contact-link:hover .arrow {
  transform: translateX(4px);
  color: var(--accent);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 4rem;
}

.footer-content {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

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

[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

[data-animate].animated {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero-card {
    max-width: 400px;
    margin: 0 auto;
  }

  .section-content,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1.5rem;
  }

  .nav-links {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(20px);
    padding: 2rem;
    gap: 1.5rem;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding-top: 100px;
    min-height: auto;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

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

  .section {
    padding: var(--spacing-lg) 0;
  }

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

  .timeline {
    padding-left: 2rem;
  }

  .timeline-marker {
    left: -2rem;
  }

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

  .hero-photo-wrapper {
    width: 150px;
    height: 150px;
  }

  .achievement-number {
    font-size: 3rem;
  }
}

/* Print Styles */
@media print {
  .navbar,
  .hero-bg,
  .gradient-orb,
  .mobile-menu-btn,
  .language-selector {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .section {
    page-break-inside: avoid;
  }
}