:root {
  --primary-color: #3b82f6;
  --secondary-color: #8b5cf6;
  --bg-dark: #0f172a;
  --bg-darker: #020617;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #1e293b;
  --card-bg: #1e293b;
  --hover-bg: #334155;
  --sidebar-width: 280px;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-darker);
  border-right: 1px solid var(--border-color);
  padding: 2rem 1.5rem;
  z-index: 1000;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.sidebar.hidden {
  transform: translateX(-100%);
}

.profile-section {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.profile-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  margin: 0 auto 1rem;
  border: 3px solid var(--primary-color);
  background: var(--card-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--primary-color);
  overflow: hidden;
}

.profile-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.profile-title {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.lang-toggle {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}

.lang-btn {
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
}

.lang-btn:hover,
.lang-btn.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.nav-menu {
  list-style: none;
  flex: 1;
}

.nav-menu li {
  margin-bottom: 0.5rem;
}

.nav-menu a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
  transition: var(--transition);
  font-size: 0.95rem;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.nav-menu .icon {
  font-size: 1.2rem;
  width: 20px;
  text-align: center;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--card-bg);
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  font-size: 1.2rem;
}

.social-link:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-3px);
}

/* Mobile Menu Toggle */
.menu-toggle {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 1001;
  background: var(--bg-darker);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  border-radius: 8px;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: var(--transition);
}

.menu-toggle:hover {
  background: var(--hover-bg);
}

/* Main Content */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 3rem;
  max-width: 1200px;
}

section {
  margin-bottom: 4rem;
  padding-top: 2rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
  position: relative;
  padding-bottom: 0.5rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* Hero/About Section */
.hero-content h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-content .tagline {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.hero-content .description {
  font-size: 1.1rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: #2563eb;
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

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

/* Skills Grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.skill-category {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.skill-category:hover {
  border-color: var(--primary-color);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.skill-category h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  padding: 0.35rem 0.75rem;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.skill-tag i {
  font-size: 1rem;
}

.skill-tag:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* Experience Timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
}

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

.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
  padding-left: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--primary-color);
  border: 3px solid var(--bg-dark);
  z-index: 1;
}

.timeline-item.current::before {
  animation: pulse 2s infinite;
  box-shadow: 0 0 0 0 var(--primary-color);
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(59, 130, 246, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
  }
}

.timeline-content {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.timeline-content:hover {
  border-color: var(--primary-color);
  transform: translateX(5px);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.company-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.timeline-period {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.25rem 0.75rem;
  background: var(--bg-dark);
  border-radius: 6px;
}

.job-title {
  font-size: 1rem;
  color: var(--primary-color);
  margin-bottom: 0.75rem;
}

.timeline-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.timeline-description ul {
  margin: 0.75rem 0;
  padding-left: 1.5rem;
}

.timeline-description li {
  margin-bottom: 0.5rem;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-color);
  text-decoration: none;
  margin-top: 0.75rem;
  font-size: 0.9rem;
  transition: var(--transition);
}

.project-link:hover {
  color: var(--secondary-color);
  transform: translateX(3px);
}

/* Contact Section */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.contact-item {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  text-align: center;
}

.contact-item:hover {
  border-color: var(--primary-color);
  transform: translateY(-5px);
}

.contact-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  border-radius: 50%;
  font-size: 1.5rem;
  color: var(--primary-color);
}

.contact-item h3 {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.contact-item a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  word-break: break-all;
}

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

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

footer small {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: #3a3a3a;
  border: 1px solid #505050;
  border-radius: 2rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  font-size: 0.875rem;
  font-weight: 500;
  color: #b3b3b3;
  transition: all 0.3s ease;
  white-space: nowrap;
}

footer small:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  border-color: #606060;
}

footer small svg {
  flex-shrink: 0;
  opacity: 0.8;
}

footer small a {
  color: #e0e0e0;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}

footer small a:hover {
  color: white;
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

/* Responsive Design - Mobile First */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.active {
    transform: translateX(0);
  }

  .menu-toggle {
    display: flex;
  }

  .main-content {
    margin-left: 0;
    padding: 5rem 1.5rem 2rem;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-content .tagline {
    font-size: 1.2rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .skills-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .timeline {
    padding-left: 1rem;
  }

  .timeline-item {
    padding-left: 1.5rem;
  }

  .timeline-item::before {
    left: -1.5rem;
  }

  .cta-buttons {
    flex-direction: column;
  }

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

@media (min-width: 769px) and (max-width: 1024px) {
  :root {
    --sidebar-width: 240px;
  }

  .main-content {
    padding: 2rem;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

section {
  animation: fadeIn 0.6s ease-out;
}

/* Smooth scroll offset for fixed sidebar */
section[id] {
  scroll-margin-top: 2rem;
}