:root {
  --primary: #00b7c7;
  --primary-dark: #008b98;
  --dark: #1e1e2f;
  --dark-light: #2a2a3b;
  --text: #ffffff;
  --text-muted: #cccccc;
  --transition: all 0.3s ease;
}

[data-theme="light"] {
  --primary: #00b7c7;
  --primary-dark: #008b98;
  --dark: #f8f9fa;
  --dark-light: #e9ecef;
  --text: #212529;
  --text-muted: #6c757d;
}

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

body {
  font-family: 'Poppins', sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.6;
  opacity: 0;
  transition: opacity 0.5s ease;
}

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

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border: none;
  background: var(--primary);
  color: var(--dark);
  font-weight: 500;
  border-radius: 5px;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
}

.btn:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0,183,199,0.3);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--dark);
}

.section {
  padding: 5rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 2.5rem;
  color: var(--primary);
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  height: 3px;
  background: var(--primary);
}

/* Header & Navigation */
header {
  background: var(--dark-light);
  position: fixed;
  width: 100%;
  z-index: 100;
  box-shadow: 0 2px 15px rgba(0,0,0,0.2);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5%;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

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

.theme-toggle {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: var(--transition);
}

.theme-toggle:hover {
  background: var(--dark);
  transform: rotate(180deg);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  position: relative;
  transition: var(--transition);
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active::after {
  color: var(--primary);
  width: 100%;
}

.mobile-menu {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--primary);
}

/* Page Header */
.page-header {
  background: var(--dark-light);
  padding: 8rem 0 4rem;
  text-align: center;
}

.page-header h1 {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.page-header p {
  font-size: 1.2rem;
  color: var(--text-muted);
}

/* Hero Section */
.hero {
  position: relative;
  height: 100vh;
  background: linear-gradient(rgba(30,30,47,0.8), rgba(30,30,47,0.9)), url('/api/placeholder/1200/600') center/cover no-repeat;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding-top: 4rem;
}

.hero-content {
  max-width: 700px;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  animation: fadeIn 1s ease;
}

.hero h2 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--primary);
  animation: fadeIn 1s ease 0.3s both;
}

.hero p {
  font-size: 1.2rem;
  margin: 1rem 0 2rem;
  animation: fadeIn 1s ease 0.6s both;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
  animation: fadeIn 1s ease 0.9s both;
}

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

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-50px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(50px); }
  to { opacity: 1; transform: translateX(0); }
}

.fade-in {
  animation: fadeIn 0.8s ease forwards;
}

.slide-in-left {
  animation: slideInLeft 0.8s ease forwards;
}

.slide-in-right {
  animation: slideInRight 0.8s ease forwards;
}

.scroll-down {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
  color: var(--primary);
  font-size: 1.5rem;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-20px); }
  60% { transform: translateY(-10px); }
}

/* About Section */
.about {
  background: var(--dark);
}

.about-content {
  display: flex;
  align-items: center;
  gap: 4rem;
}

.about-image {
  flex: 1;
  text-align: center;
}

.about-image img {
  width: 300px;
  height: 300px;
  object-fit: cover;
  border-radius: 50%;
  border: 5px solid var(--primary);
  box-shadow: 0 0 30px rgba(0,183,199,0.3);
}

.about-text {
  flex: 2;
}

.about-text h3 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

.about-text p {
  margin-bottom: 1rem;
}

.skills {
  margin-top: 2rem;
}

.skills h4 {
  margin-bottom: 1rem;
  color: var(--primary);
}

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

.skill-tag {
  background: var(--dark-light);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.9rem;
  border: 1px solid var(--primary);
}

.skill-progress {
  margin-top: 2rem;
}

.skill-progress h4 {
  margin-bottom: 1.5rem;
  color: var(--primary);
}

.progress-item {
  margin-bottom: 1.5rem;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--dark-light);
  border-radius: 10px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  border-radius: 10px;
  width: 0;
  transition: width 1.5s ease;
}

/* Experience Section */
.experience {
  background: var(--dark-light);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--primary);
  transform: translateX(-50%);
}

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

.timeline-item:nth-child(odd) .timeline-content {
  margin-left: 0;
  margin-right: 50%;
  padding-right: 2rem;
  text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
  margin-left: 50%;
  margin-right: 0;
  padding-left: 2rem;
  text-align: left;
}

.timeline-content {
  background: var(--dark);
  padding: 1.5rem;
  border-radius: 10px;
  position: relative;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.timeline-content::before {
  content: '';
  position: absolute;
  top: 20px;
  width: 0;
  height: 0;
  border: 10px solid transparent;
}

.timeline-item:nth-child(odd) .timeline-content::before {
  right: -20px;
  border-left-color: var(--dark);
}

.timeline-item:nth-child(even) .timeline-content::before {
  left: -20px;
  border-right-color: var(--dark);
}

.timeline-date {
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.timeline-content h3 {
  color: var(--text);
  margin-bottom: 0.5rem;
}

.timeline-content h4 {
  color: var(--primary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  font-weight: 500;
}

/* Services Section */
.services {
  background: var(--dark-light);
}

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

.service-card {
  background: var(--dark);
  border-radius: 10px;
  padding: 2rem;
  text-align: center;
  transition: var(--transition);
  border-bottom: 3px solid transparent;
}

.service-card:hover {
  transform: translateY(-10px);
  border-bottom: 3px solid var(--primary);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.service-icon {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
}

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

/* Projects Section */
.projects {
  background: var(--dark);
}

.project-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1.5rem;
  background: var(--dark-light);
  border: none;
  color: var(--text);
  border-radius: 30px;
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Poppins', sans-serif;
}

.filter-btn.active, .filter-btn:hover {
  background: var(--primary);
  color: var(--dark);
}

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

.project-card {
  background: var(--dark-light);
  border-radius: 10px;
  overflow: hidden;
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.project-img {
  height: 200px;
  background: linear-gradient(90deg, #444 25%, #555 50%, #444 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
  position: relative;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,183,199,0.9);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: var(--transition);
}

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

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

.project-links a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--dark);
  color: var(--primary);
  display: flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  transition: var(--transition);
}

.project-links a:hover {
  background: var(--primary-dark);
  color: var(--text);
}

.project-info {
  padding: 1.5rem;
}

.project-info h3 {
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.project-tag {
  font-size: 0.8rem;
  padding: 0.2rem 0.8rem;
  background: var(--dark);
  border-radius: 20px;
}

/* Blog Section */
.blog {
  background: var(--dark);
}

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

.blog-card {
  background: var(--dark-light);
  border-radius: 10px;
  overflow: hidden;
  transition: var(--transition);
}

.blog-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.blog-image {
  height: 200px;
  overflow: hidden;
}

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

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

.blog-content {
  padding: 1.5rem;
}

.blog-meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
  font-size: 0.8rem;
}

.blog-date {
  color: var(--text-muted);
}

.blog-category {
  color: var(--primary);
  font-weight: 500;
}

.blog-content h3 {
  color: var(--text);
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.blog-content p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.read-more {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.read-more:hover {
  gap: 1rem;
}

/* Contact Section */
.contact {
  background: var(--dark-light);
}

.contact-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

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

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

.contact-icon {
  width: 50px;
  height: 50px;
  background: var(--dark);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--primary);
  font-size: 1.2rem;
}

.contact-details h4 {
  color: var(--primary);
}

.contact-form {
  background: var(--dark);
  padding: 2rem;
  border-radius: 10px;
}

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

.form-control {
  width: 100%;
  padding: 0.8rem;
  border-radius: 5px;
  border: 1px solid var(--dark-light);
  background: var(--dark-light);
  color: var(--text);
  font-family: 'Poppins', sans-serif;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--primary);
  outline: none;
}

textarea.form-control {
  min-height: 150px;
  resize: vertical;
}

/* Footer */
footer {
  background: var(--dark);
  padding: 3rem 0 1rem;
  text-align: center;
}

.footer-content {
  max-width: 500px;
  margin: 0 auto 2rem;
}

.footer-logo {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 1rem;
  font-weight: 700;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin: 2rem 0;
}

.social-link {
  width: 40px;
  height: 40px;
  background: var(--dark-light);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--primary);
  color: var(--dark);
  transform: translateY(-5px);
}

.copyright {
  border-top: 1px solid var(--dark-light);
  padding-top: 1.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Notification System */
.notification {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  max-width: 400px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  animation: slideInRight 0.3s ease;
}

.notification-success {
  background: #10b981;
  color: white;
}

.notification-error {
  background: #ef4444;
  color: white;
}

.notification-info {
  background: var(--primary);
  color: var(--dark);
}

.notification-content {
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.notification-close {
  background: none;
  border: none;
  color: inherit;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition);
}

.notification-close:hover {
  background: rgba(255,255,255,0.2);
}

/* Responsive Design */
@media screen and (max-width: 992px) {
  .about-content {
    flex-direction: column;
    text-align: center;
  }
  
  .about-image {
    margin-bottom: 2rem;
  }
}

@media screen and (max-width: 768px) {
  .timeline::before {
    left: 20px;
  }
  
  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    margin-left: 50px;
    margin-right: 0;
    padding-left: 2rem;
    padding-right: 1rem;
    text-align: left;
  }
  
  .timeline-item:nth-child(odd) .timeline-content::before,
  .timeline-item:nth-child(even) .timeline-content::before {
    left: -20px;
    right: auto;
    border-right-color: var(--dark);
    border-left-color: transparent;
  }
  
  .nav-links {
    position: fixed;
    top: 70px;
    right: -100%;
    width: 250px;
    height: calc(100vh - 70px);
    background: var(--dark-light);
    flex-direction: column;
    text-align: center;
    padding: 2rem;
    transition: var(--transition);
    box-shadow: -5px 0 15px rgba(0,0,0,0.2);
  }
  
  .nav-links.active {
    right: 0;
  }
  
  .mobile-menu {
    display: block;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero h2 {
    font-size: 1.5rem;
  }
  
  .section-title h2 {
    font-size: 2rem;
  }
  
  .hero-btns {
    flex-direction: column;
    align-items: center;
  }
  
  .nav-controls {
    gap: 0.5rem;
  }
  
  .blog-grid {
    grid-template-columns: 1fr;
  }
  
  .skill-progress {
    margin-top: 1.5rem;
  }
}

@media screen and (max-width: 576px) {
  .container {
    padding: 0 1rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero h2 {
    font-size: 1.2rem;
  }
  
  .section {
    padding: 3rem 0;
  }
}