:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #64748b;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border: #e2e8f0;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #94a3b8;
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --border: #334155;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

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

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

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem;
  background: var(--bg-primary);
  min-height: 100vh;
  box-shadow: var(--shadow-lg);
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--bg-primary);
  border: 2px solid var(--border);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 1000;
  box-shadow: var(--shadow);
}

.theme-toggle:hover {
  transform: scale(1.1);
  border-color: var(--primary);
}

.theme-toggle svg {
  color: var(--text-primary);
}

[data-theme="light"] .moon-icon,
[data-theme="dark"] .sun-icon {
  display: none;
}

/* Language Switcher */
.lang-switcher {
  position: fixed;
  top: 5.5rem;
  right: 1.5rem;
  display: flex;
  background: var(--bg-primary);
  border: 2px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  z-index: 1000;
  box-shadow: var(--shadow);
}

.lang-btn {
  background: none;
  border: none;
  padding: 0.3rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-secondary);
  transition: var(--transition);
  letter-spacing: 0.05em;
}

.lang-btn.active {
  background: var(--primary);
  color: #fff;
}

.lang-btn:hover:not(.active) {
  color: var(--primary);
}

/* Header */
.cv-header {
  text-align: center;
  padding: 2rem 0 3rem;
  border-bottom: 2px solid var(--border);
  margin-bottom: 3rem;
}

.name {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.title {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 1.5rem;
}

.contact-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition);
}

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

.contact-item svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* Download Buttons */
.download-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

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

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

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

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

/* Sections */
.cv-section {
  margin-bottom: 3rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--primary);
  display: inline-block;
}

.summary-text {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  text-align: justify;
}

/* Skills */
.skills-grid {
  display: grid;
  gap: 1.5rem;
}

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

.skill-category:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateX(4px);
}

.skill-category-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

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

.skill-tag {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.skill-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

/* Experience */
.experience-item {
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
}

.experience-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
  gap: 2rem;
}

.job-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.company-name {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.company-note {
  font-weight: 400;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.job-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-top: 0.5rem;
}

.experience-meta {
  text-align: right;
  flex-shrink: 0;
}

.period,
.location,
.region {
  display: block;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.region {
  font-weight: 600;
  color: var(--primary);
}

.achievements-list {
  list-style: none;
  margin-top: 1rem;
}

.achievements-list li {
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  position: relative;
  color: var(--text-secondary);
  line-height: 1.6;
}

.achievements-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: bold;
}

/* Certifications */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 0.75rem;
}

.certification-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: var(--transition);
}

.certification-item:hover {
  border-color: var(--primary);
  transform: translateX(4px);
}

.certification-item svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* Projects */
.project-item {
  margin-bottom: 2rem;
  padding: 1.25rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.project-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateX(4px);
}

.project-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.project-description {
  list-style: none;
}

.project-description li {
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  position: relative;
  color: var(--text-secondary);
}

.project-description li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: bold;
}

/* Education */
.education-item {
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.education-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateX(4px);
}

.degree-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.institution {
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.edu-period {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Languages */
.languages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.language-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.25rem 1.25rem 1.25rem 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  transition: var(--transition);
}

.language-item:hover {
  box-shadow: var(--shadow);
  transform: translateX(4px);
}

.language-name {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 1rem;
}

.language-level {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.4;
}

/* Footer */
.cv-footer {
  text-align: center;
  padding: 2rem 0;
  margin-top: 3rem;
  border-top: 2px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  .name {
    font-size: 2rem;
  }

  .title {
    font-size: 1.2rem;
  }

  .contact-info {
    flex-direction: column;
    gap: 0.75rem;
  }

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

  .experience-header {
    flex-direction: column;
  }

  .experience-meta {
    text-align: left;
  }

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

  .theme-toggle {
    top: 1rem;
    right: 1rem;
  }
}

@media (max-width: 480px) {
  .name {
    font-size: 1.75rem;
  }

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