:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --text-muted: #666666;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e5e7eb;
  --card-bg: #ffffff;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
}

html[data-theme="dark"] {
  --bg: #111111;
  --text: #f5f5f5;
  --text-muted: #a3a3a3;
  --accent: #06b6d4;
  --accent-hover: #0891b2;
  --border: #374151;
  --card-bg: #1f1f1f;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--accent);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius);
  z-index: 1000;
}

.skip-link:focus {
  top: 6px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.site-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  z-index: 100;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
}

.logo a {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.main-nav .nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

.main-nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--accent);
}

#theme-toggle {
  background: none;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: var(--spacing-xs);
  color: var(--text);
  cursor: pointer;
  transition: all 0.3s ease;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text);
  margin: 3px 0;
  transition: 0.3s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--spacing-3xl) 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-text {
  text-align: left;
}

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

.profile-container {
  position: relative;
  width: 300px;
  height: 300px;
}

.profile-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-lg);
  border: 4px solid var(--accent);
}

.hero h1 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
}

.hero h2 {
  font-size: var(--font-size-xl);
  color: var(--text-muted);
  font-weight: 400;
  margin-bottom: var(--spacing-lg);
}

.hero p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.hero .social-links {
  display: flex;
  gap: var(--spacing-md);
}

.hero .social-links a {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  font-size: var(--font-size-xl);
  transition: all 0.3s ease;
  text-decoration: none;
}

.hero .social-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.fa-x-twitter::before {
  content: "𝕏";
  font-family: inherit;
  font-weight: bold;
}

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-xl);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: 2px solid transparent;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  border: 2px solid var(--accent);
  color: var(--accent);
}

.btn-secondary:hover {
  background: var(--accent);
  color: white;
}

main {
  flex: 1;
}

section {
  padding: var(--spacing-3xl) 0;
}

section h1,
section h2 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-2xl);
  text-align: center;
}

.about-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

.about-text p {
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-lg);
}

.avatar {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-lg);
}

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

.skill-category h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
}

.skill-list {
  list-style: none;
}

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

.skill-name {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.skill-bar-container {
  background: var(--border);
  height: 8px;
  border-radius: 4px;
  overflow: hidden;
}

.skill-bar {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width 1s ease;
}

.skill[data-skill-level="85"] .skill-bar {
  width: 85%;
}

.skill[data-skill-level="80"] .skill-bar {
  width: 80%;
}

.skill[data-skill-level="75"] .skill-bar {
  width: 75%;
}

.skill[data-skill-level="70"] .skill-bar {
  width: 70%;
}

.skill[data-skill-level="65"] .skill-bar {
  width: 65%;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.project-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.project-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.project-content {
  padding: var(--spacing-lg);
}

.project-content h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
}

.project-content p {
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
}

.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.tech-list li {
  background: var(--border);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
}

.project-links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.project-links a,
.btn-case-study {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.project-links a:hover,
.btn-case-study:hover {
  background: var(--accent);
  color: white;
}

.project-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.project-modal[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
}

.modal-content {
  background: var(--card-bg);
  border-radius: var(--radius);
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  z-index: 1;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  cursor: pointer;
  color: var(--text);
}

.modal-body {
  padding: var(--spacing-lg);
}

.timeline {
  position: relative;
  padding-left: var(--spacing-xl);
}

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

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-2xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -25px;
  top: 0;
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
}

.timeline-date {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.timeline-content h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

.timeline-content h4 {
  color: var(--accent);
  margin-bottom: var(--spacing-sm);
}

.timeline-content ul {
  padding-left: var(--spacing-lg);
}

.education-item {
  background: var(--card-bg);
  padding: var(--spacing-xl);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.education-item h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

.education-item h4 {
  color: var(--accent);
  margin-bottom: var(--spacing-sm);
}

.education-date {
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}



.blog-posts {
  display: grid;
  gap: var(--spacing-xl);
  max-width: 800px;
  margin: 0 auto;
}

.blog-post {
  padding: var(--spacing-lg);
  border-left: 4px solid var(--accent);
}

.blog-post h2 a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.3s ease;
}

.blog-post h2 a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.blog-meta {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-2xl);
  max-width: 1000px;
  margin: 0 auto;
}

.contact-info {
  font-size: var(--font-size-lg);
}

.contact-details {
  margin-top: var(--spacing-lg);
}

.contact-details a {
  color: var(--accent);
  text-decoration: none;
}

.contact-form {
  display: grid;
  gap: var(--spacing-lg);
}

.form-group {
  display: grid;
  gap: var(--spacing-xs);
}

.form-group label {
  font-weight: 600;
}

.form-group input,
.form-group textarea {
  padding: var(--spacing-sm);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  outline: none;
}

.form-status {
  padding: var(--spacing-sm);
  border-radius: var(--radius);
  font-weight: 600;
  text-align: center;
}

.form-status.success {
  background: #dcfce7;
  color: #166534;
}

.form-status.error {
  background: #fef2f2;
  color: #dc2626;
}

.footer {
  background: #1a1a1a;
  color: #f5f5f5;
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.footer-nav a {
  color: #f5f5f5;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-nav a:hover {
  color: var(--accent);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  justify-self: end;
}

.social-links a {
  color: #f5f5f5;
  text-decoration: none;
  transition: color 0.3s ease;
}

.social-links a:hover {
  color: var(--accent);
}

.back-to-top {
  text-align: center;
  border-top: 1px solid #374151;
  padding-top: var(--spacing-lg);
}

.back-to-top a {
  color: #f5f5f5;
  text-decoration: none;
  transition: color 0.3s ease;
}

.back-to-top a:hover {
  color: var(--accent);
}

@media (max-width: 1024px) {
  .about-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

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

  .social-links {
    justify-self: center;
  }
}

@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-2xl);
  }

  .hero-text {
    text-align: center;
    order: 2;
  }

  .hero-image {
    order: 1;
  }

  .profile-container {
    width: 250px;
    height: 250px;
  }
}

/* Particle Network Canvas */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}


@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    width: 250px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
  }

  .nav-toggle[aria-expanded="true"]+.main-nav,
  .main-nav.open {
    display: block;
  }

  .main-nav .nav-list {
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: 0;
  }

  .main-nav .nav-list li {
    width: 100%;
  }

  .main-nav .nav-list a {
    display: block;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border);
    font-size: var(--font-size-lg);
    transition: all 0.3s ease;
  }

  .main-nav .nav-list a:hover {
    padding-left: var(--spacing-md);
    background: var(--border);
  }

  #theme-toggle {
    width: 100%;
    justify-content: flex-start;
    padding: var(--spacing-md) 0;
    border: none;
    border-top: 1px solid var(--border);
    border-radius: 0;
  }

  .hero h1 {
    font-size: var(--font-size-3xl);
  }

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

  .hero .social-links {
    justify-content: center;
  }

  .profile-container {
    width: 200px;
    height: 200px;
  }

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

  .project-image {
    height: auto;
    max-height: 200px;
    object-fit: contain;
  }

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

  .container {
    padding: 0 var(--spacing-md);
  }

  section {
    padding: var(--spacing-2xl) 0;
  }

  .footer-nav ul {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }
}

/* Scroll Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  will-change: opacity, transform;
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.visible,
.animate-on-scroll {
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-on-scroll:nth-child(2) {
  animation-delay: 0.1s;
}

.animate-on-scroll:nth-child(3) {
  animation-delay: 0.2s;
}

.animate-on-scroll:nth-child(4) {
  animation-delay: 0.3s;
}

.animate-on-scroll:nth-child(5) {
  animation-delay: 0.4s;
}

.animate-on-scroll:nth-child(6) {
  animation-delay: 0.5s;
}

@media (prefers-reduced-motion: reduce) {
  .animate-on-scroll {
    animation: none;
    opacity: 1;
    transform: none;
  }
}