:root {
  --primary: #0a66c2;
  --primary-dark: #054399;
  --secondary: #67b26f;
  --background: #ffffff;
  --surface: #f3f2ef;
  --text-primary: #000000;
  --text-secondary: #555555;
  --border: #e5e5e5;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

body.dark-mode {
  --background: #0a0e27;
  --surface: #161b22;
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --border: #30363d;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--background);
  color: var(--text-primary);
  transition: var(--transition);
  line-height: 1.6;
}

body[dir="rtl"] {
  text-align: right;
  direction: rtl;
}

body[dir="ltr"] {
  text-align: left;
  direction: ltr;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Navigation */
.header {
  position: sticky;
  top: 0;
  background-color: var(--background);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  z-index: 100;
  transition: var(--transition);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.logo-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  display: flex;
  gap: 30px;
  flex: 1;
  justify-content: center;
}

.nav ul {
  display: flex;
  gap: 30px;
  list-style: none;
}

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

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

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

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

.controls {
  display: flex;
  gap: 15px;
  align-items: center;
}

.lang-toggle,
.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition);
  font-weight: 500;
  font-size: 14px;
}

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

.theme-toggle i {
  font-size: 16px;
}

/* Hero Section */
.hero {
  padding: 80px 20px;
  text-align: center;
  background: linear-gradient(135deg, var(--surface) 0%, var(--background) 100%);
}

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

.hero-avatar {
  margin-bottom: 30px;
}

.avatar-circle {
  width: 120px;
  height: 120px;
  margin: 0 auto;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 50px;
  color: white;
  box-shadow: var(--shadow-lg);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 24px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 15px;
}

.hero-description {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 30px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 30px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

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

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

/* Sections */
.section {
  padding: 80px 20px;
  border-bottom: 1px solid var(--border);
}

.section-content {
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 40px;
  color: var(--text-primary);
  text-align: center;
  position: relative;
  padding-bottom: 20px;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 2px;
}

/* About Section */
.about-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 40px;
  align-items: center;
}

.about-text p {
  margin-bottom: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 16px;
}

.about-stats {
  display: grid;
  gap: 20px;
}

.stat-item {
  text-align: center;
  padding: 20px;
  background-color: var(--surface);
  border-radius: 10px;
  border-left: 4px solid var(--primary);
}

.stat-item h3 {
  font-size: 32px;
  color: var(--primary);
  margin-bottom: 5px;
}

.stat-item p {
  color: var(--text-secondary);
  font-size: 14px;
}

/* Experience Section */
.experience-timeline {
  position: relative;
  padding: 20px 0;
}

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

.experience-item {
  margin-bottom: 40px;
  position: relative;
}

.experience-item:nth-child(odd) {
  margin-left: 0;
  margin-right: 50%;
  text-align: right;
  padding-right: 30px;
}

.experience-item:nth-child(even) {
  margin-left: 50%;
  margin-right: 0;
  text-align: left;
  padding-left: 30px;
}

.experience-item::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background-color: var(--primary);
  border: 3px solid var(--background);
  border-radius: 50%;
  top: 0;
  box-shadow: var(--shadow);
}

.experience-item:nth-child(odd)::before {
  right: -48px;
}

.experience-item:nth-child(even)::before {
  left: -48px;
}

.experience-item:hover .experience-header h3 {
  color: var(--primary);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 8px;
}

.experience-header h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  transition: var(--transition);
}

.date {
  font-size: 14px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.company {
  font-size: 14px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 10px;
}

.experience-list {
  list-style: none;
  padding: 0;
}

.experience-list li {
  padding: 6px 0;
  color: var(--text-secondary);
  font-size: 14px;
  position: relative;
  padding-left: 20px;
}

.experience-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--primary);
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.skill-category {
  background-color: var(--surface);
  padding: 25px;
  border-radius: 10px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.skill-category:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-5px);
  border-color: var(--primary);
}

.skill-category h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--primary);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  background-color: var(--background);
  color: var(--text-primary);
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}

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

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.project-card {
  background-color: var(--surface);
  padding: 25px;
  border-radius: 10px;
  border: 1px solid var(--border);
  transition: var(--transition);
  overflow: hidden;
  position: relative;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

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

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 15px;
  margin-bottom: 10px;
}

.project-header h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.project-links {
  display: flex;
  gap: 10px;
}

.project-links a {
  color: var(--primary);
  font-size: 18px;
  transition: var(--transition);
}

.project-links a:hover {
  color: var(--secondary);
  transform: scale(1.2);
}

.project-period {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 10px;
  font-weight: 500;
}

.project-description {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: 15px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-tags span {
  background-color: var(--background);
  color: var(--primary);
  padding: 6px 12px;
  border-radius: 15px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--primary);
}

/* Certifications Section */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.cert-item {
  background-color: var(--surface);
  padding: 20px;
  border-radius: 10px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.cert-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-5px);
  border-color: var(--primary);
}

.cert-item i {
  font-size: 32px;
  color: var(--primary);
  margin-bottom: 12px;
}

.cert-item h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.cert-item p {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.cert-date {
  font-size: 11px;
  color: var(--primary);
  font-weight: 600;
}

/* Testimonials Section */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
}

.testimonial-card {
  background-color: var(--surface);
  padding: 25px;
  border-radius: 10px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.testimonial-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-5px);
}

.testimonial-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.testimonial-header h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.stars {
  color: #ffc107;
  font-size: 14px;
}

.testimonial-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
  font-style: italic;
}

/* Contact Section */
.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-content > p {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 30px;
  line-height: 1.8;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 15px 25px;
  background-color: var(--surface);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  transition: var(--transition);
  border: 2px solid transparent;
}

.contact-link:hover {
  background-color: var(--primary);
  color: white;
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.contact-link i {
  font-size: 24px;
}

/* Footer */
.footer {
  background-color: var(--surface);
  padding: 20px;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer-content p {
  color: var(--text-secondary);
  font-size: 14px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    flex-wrap: wrap;
    gap: 15px;
  }

  .nav ul {
    gap: 15px;
    font-size: 14px;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

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

  .experience-timeline::before {
    left: 0;
  }

  .experience-item:nth-child(odd),
  .experience-item:nth-child(even) {
    margin-left: 0;
    margin-right: 0;
    text-align: left;
    padding-right: 0;
    padding-left: 40px;
  }

  .experience-item:nth-child(odd)::before,
  .experience-item:nth-child(even)::before {
    left: -48px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

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

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .header-content {
    padding: 12px 15px;
  }

  .nav ul {
    gap: 10px;
    font-size: 12px;
  }

  .hero {
    padding: 40px 15px;
  }

  .hero-title {
    font-size: 24px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .section {
    padding: 40px 15px;
  }

  .section-title {
    font-size: 24px;
  }

  .experience-item {
    padding-left: 30px;
  }

  .experience-item:nth-child(odd)::before,
  .experience-item:nth-child(even)::before {
    left: -38px;
  }
}