:root {
  --primary-color: #2563eb;
  --secondary-color: #1e40af;
  --dark-color: #1e293b;
  --light-color: #f8fafc;
  --gray-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --border-radius: 8px;
  --box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --transition: all 0.3s ease;
}

/* Dark mode variables */
.dark-mode {
  --primary-color: #3b82f6;
  --secondary-color: #2563eb;
  --dark-color: #0f172a;
  --light-color: #1e293b;
  --gray-color: #94a3b8;
  --box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

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

body {
  font-family: 'Poppins', sans-serif;
  background-color: var(--light-color);
  color: var(--dark-color);
  transition: var(--transition);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

.highlight {
  color: var(--primary-color);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

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

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

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

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

/* Header & Navigation */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(248, 250, 252, 0.9);
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
}

.dark-mode .navbar {
  background-color: rgba(15, 23, 42, 0.9);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

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

.dark-mode .nav-links a {
  color: white;
}

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

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

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

#theme-toggle {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--dark-color);
  transition: var(--transition);
}

.dark-mode #theme-toggle {
  color: white;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 2rem;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.profile-container {
  position: relative;
  margin-bottom: 2rem;
}

.profile-pic {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: contain;
  border: 5px solid var(--primary-color);
  box-shadow: var(--box-shadow);
}

.tech-icons {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 1rem;
  background-color: var(--light-color);
  padding: 0.75rem 1.5rem;
  border-radius: 50px;
  box-shadow: var(--box-shadow);
}

.tech-icons i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero h2 {
  font-size: 1.75rem;
  font-weight: 400;
  margin-bottom: 1.5rem;
  color: var(--gray-color);
}

.hero-description {
  max-width: 600px;
  margin: 0 auto 2rem;
  font-size: 1.1rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-indicator span {
  display: block;
  width: 20px;
  height: 20px;
  border-bottom: 2px solid var(--primary-color);
  border-right: 2px solid var(--primary-color);
  transform: rotate(45deg);
  margin: -10px;
  animation: scroll 2s infinite;
}

.scroll-indicator span:nth-child(2) {
  animation-delay: -0.2s;
}

.scroll-indicator span:nth-child(3) {
  animation-delay: -0.4s;
}

@keyframes scroll {
  0% {
    opacity: 0;
    transform: rotate(45deg) translate(-20px, -20px);
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: rotate(45deg) translate(20px, 20px);
  }
}

/* Sections */
.section {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

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

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.section-header h2 span {
  color: var(--primary-color);
}

.section-divider {
  width: 80px;
  height: 4px;
  background-color: var(--primary-color);
  margin: 0 auto;
  border-radius: 2px;
}

/* About Section */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-text p {
  margin-bottom: 1.5rem;
}

.personal-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

.personal-info div {
  margin-bottom: 1rem;
}

.personal-info span {
  font-weight: 600;
  color: var(--primary-color);
  display: block;
  margin-bottom: 0.25rem;
}

/* Experience Section */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  background-color: var(--primary-color);
  transform: translateX(-50%);
}

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

.timeline-date {
  position: absolute;
  top: 0;
  width: 120px;
  padding: 0.5rem;
  background-color: var(--primary-color);
  color: white;
  text-align: center;
  border-radius: var(--border-radius);
  font-weight: 500;
  box-shadow: var(--box-shadow);
}

.timeline-item:nth-child(odd) .timeline-date {
  left: calc(50% - 170px);
}

.timeline-item:nth-child(even) .timeline-date {
  right: calc(50% - 170px);
}

.timeline-content {
  position: relative;
  padding: 1.5rem;
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.dark-mode .timeline-content {
  background-color: var(--dark-color);
}

.timeline-item:nth-child(odd) .timeline-content {
  margin-left: calc(50% + 60px);
}

.timeline-item:nth-child(even) .timeline-content {
  margin-right: calc(50% + 60px);
}

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

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

.timeline-content ul {
  list-style-position: inside;
}

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

/* Skills Section */
.skills-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.skill-category {
  margin-bottom: 2rem;
}

.skill-category h3 {
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

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

.skill-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.skill-bar {
  height: 10px;
  background-color: #e2e8f0;
  border-radius: 5px;
  overflow: hidden;
}

.dark-mode .skill-bar {
  background-color: #334155;
}

.skill-progress {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: 5px;
  transition: width 1s ease-in-out;
}

/* Projects Section */
.project-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
}

.card {
  background-color: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.dark-mode .card {
  background-color: var(--dark-color);
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.dark-mode .card:hover {
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

.card-image {
  height: 200px;
  background-size: cover;
  background-position: center;
}

.card-content {
  padding: 1.5rem;
}

.card-content h3 {
  margin-bottom: 0.75rem;
}

.card-content p {
  color: var(--gray-color);
  margin-bottom: 1.5rem;
}

.tech-used {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tech-used span {
  background-color: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 500;
}

.project-link {
  display: inline-flex;
  align-items: center;
  color: var(--primary-color);
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
}

.project-link i {
  margin-left: 0.5rem;
  transition: var(--transition);
}

.project-link:hover {
  color: var(--secondary-color);
}

.project-link:hover i {
  transform: translateX(5px);
}

/* Certificates Section */
.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.certificate-item {
  background-color: white;
  padding: 2rem;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  text-align: center;
  transition: var(--transition);
}

/* حماية الشهادات */
.protected-certificate {
  position: relative;
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.certificate-preview {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.certificate-image-wrapper {
  position: relative;
  overflow: hidden;
  height: 200px;
}

.certificate-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

.protected-image {
  pointer-events: none;
  user-select: none;
  -webkit-user-drag: none;
}

.protection-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    45deg,
    rgba(255,255,255,0.05),
    rgba(255,255,255,0.05) 10px,
    rgba(0,0,0,0.05) 10px,
    rgba(0,0,0,0.05) 20px
  );
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  pointer-events: none;
}


.certificate-lock {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0,0,0,0.7);
  color: white;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.certificate-details {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

/* Modal التصميم */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.9);
  overflow: auto;
}

.modal-content {
  margin: 2% auto;
  width: 90%;
  max-width: 900px;
  position: relative;
}

.close-modal {
  position: absolute;
  top: -40px;
  right: 0;
  color: white;
  font-size: 35px;
  font-weight: bold;
  cursor: pointer;
}

.modal-image-container {
  position: relative;
  width: 100%;
  height: 80vh;
  overflow: hidden;
}

.modal-image-container img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.modal-footer {
  text-align: center;
  color: white;
  padding: 15px;
  background: rgba(0,0,0,0.7);
}

.dark-mode .certificate-item {
  background-color: var(--dark-color);
}

.certificate-item:hover {
  transform: translateY(-5px);
}

.certificate-icon {
  width: 60px;
  height: 60px;
  background-color: rgba(37, 99, 235, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  color: var(--primary-color);
  font-size: 1.5rem;
}

.certificate-item h3 {
  margin-bottom: 1rem;
}

.certificate-item p {
  color: var(--gray-color);
}

/* Contact Section */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

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

.contact-item i {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-top: 0.25rem;
}

.contact-item h3 {
  margin-bottom: 0.25rem;
}

.contact-item p {
  color: var(--gray-color);
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--primary-color);
  border-radius: 50%;
  transition: var(--transition);
}

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

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

.form-group {
  position: relative;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  border: 1px solid #cbd5e1;
  border-radius: var(--border-radius);
  font-family: 'Poppins', sans-serif;
  transition: var(--transition);
  background-color: white;
}

.dark-mode .form-group input,
.dark-mode .form-group textarea {
  background-color: #1e293b;
  border-color: #334155;
  color: white;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

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

/* Footer */
.footer {
  background-color: var(--dark-color);
  color: white;
  padding: 4rem 2rem 2rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.footer-logo {
  font-size: 2rem;
  font-weight: 700;
  color: white;
  margin-bottom: 1.5rem;
}

.footer p {
  max-width: 600px;
  margin-bottom: 2rem;
  color: #cbd5e1;
}

.footer-links {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: white;
  text-decoration: none;
  transition: var(--transition);
}

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

.footer-social {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.footer-social a {
  color: white;
  font-size: 1.25rem;
  transition: var(--transition);
}

.footer-social a:hover {
  color: var(--primary-color);
  transform: translateY(-3px);
}

.footer-copyright {
  color: #94a3b8;
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 992px) {
  .about-content,
  .contact-container {
    grid-template-columns: 1fr;
  }
  
  .skills-container {
    grid-template-columns: 1fr;
  }
  
  .timeline::before {
    left: 30px;
  }
  
  .timeline-item:nth-child(odd) .timeline-date,
  .timeline-item:nth-child(even) .timeline-date {
    left: 0;
    right: auto;
  }
  
  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    margin-left: 80px;
    top: 45px;
    margin-right: 0;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 1rem;
  }
  
  .nav-links {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: var(--light-color);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    transition: var(--transition);
    z-index: 999;
  }
  
  .dark-mode .nav-links {
    background-color: var(--dark-color);
  }
  
  .nav-links.active {
    left: 0;
  }
  
  .hamburger {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    cursor: pointer;
    z-index: 1000;
  }
  
  .hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--dark-color);
    transition: var(--transition);
  }
  
  .dark-mode .hamburger span {
    background-color: white;
  }
  
  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero h2 {
    font-size: 1.5rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 1rem;
  }
  
  .project-cards {
    grid-template-columns: 1fr;
  }
}

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

.section {
  animation: fadeIn 1s ease-out;
}