:root {
  /* Colors */
  --primary-color: #2563eb;
  --primary-dark: #1e40af;
  --secondary-color: #0ea5e9;
  --accent-color: #10b981;
  --text-dark: #1f2937;
  --text-light: #6b7280;
  --bg-light: #f9fafb;
  --bg-white: #ffffff;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

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

html {
  scroll-behavior: smooth;
}

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

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  padding: 4rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="none"/><circle cx="50" cy="50" r="40" fill="white" opacity="0.03"/></svg>');
  opacity: 0.1;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-photo {
  width: 150px;
  height: 150px;
  margin: 0 auto 1.5rem;
  border-radius: 50%;
  overflow: hidden;
  border: 5px solid rgba(255, 255, 255, 0.3);
  box-shadow: var(--shadow-xl);
  animation: fadeInScale 0.6s ease-out;
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-name {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-title {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  opacity: 0.95;
  animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero-subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease-out 0.4s both;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease-out 0.5s both;
}

.btn-primary, .btn-secondary, .btn-large {
  padding: 0.875rem 2rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-block;
}

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

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

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
  border: 2px solid white;
}

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

.btn-large {
  background-color: var(--primary-color);
  color: white;
  font-size: 1.1rem;
  padding: 1rem 2.5rem;
}

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

.hero-social {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  animation: fadeInUp 0.6s ease-out 0.6s both;
}

.hero-social a {
  color: white;
  font-size: 1.75rem;
  transition: all 0.3s ease;
  opacity: 0.9;
}

.hero-social a:hover {
  opacity: 1;
  transform: translateY(-3px);
}

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

/* Section */
.section {
  background-color: var(--bg-white);
  border-radius: 12px;
  padding: 2.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
  animation: fadeInUp 0.6s ease-out;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-title i {
  color: var(--primary-color);
  font-size: 1.75rem;
}

/* About Section */
.about-content p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-light);
  margin-bottom: 1rem;
}

.achievement-badge {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
  padding: 1.5rem;
  border-radius: 12px;
  margin-top: 2rem;
  box-shadow: var(--shadow-md);
  max-width: 100%;
  overflow: hidden;
}

.badge-icon {
  font-size: 3rem;
  opacity: 0.9;
}

.badge-content h3 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.badge-content p {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.badge-date {
  font-size: 0.9rem;
  opacity: 0.9;
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.skill-category {
  background-color: var(--bg-light);
  padding: 1.5rem;
  border-radius: 10px;
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
}

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

.skill-category h3 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.skill-tag {
  background-color: white;
  color: var(--text-dark);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

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

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background-color: var(--bg-light);
  padding: 2rem;
  border-radius: 12px;
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
  max-width: 100%;
  overflow: hidden;
  word-wrap: break-word;
}

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

.project-icon {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.project-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-dark);
}

.project-card > p {
  color: var(--text-light);
  margin-bottom: 1rem;
  line-height: 1.6;
}

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

.project-tech span {
  background-color: white;
  color: var(--primary-color);
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.85rem;
  border: 1px solid var(--primary-color);
}

.project-link {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.3s ease;
}

.project-link:hover {
  gap: 0.75rem;
}

/* Education Timeline */
.education-timeline {
  position: relative;
  padding-left: 2rem;
}

.education-timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 2rem;
}

.timeline-marker {
  position: absolute;
  left: -2.5rem;
  top: 0.5rem;
  width: 20px;
  height: 20px;
  background-color: white;
  border: 4px solid var(--primary-color);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

.timeline-item.featured .timeline-marker {
  width: 25px;
  height: 25px;
  border-width: 5px;
  border-color: var(--accent-color);
  animation: pulse 2s infinite;
}

.timeline-content {
  background-color: var(--bg-light);
  padding: 1.5rem;
  border-radius: 10px;
  border-left: 4px solid var(--primary-color);
}

.timeline-item.featured .timeline-content {
  border-left-color: var(--accent-color);
}

.timeline-date {
  color: var(--text-light);
  font-size: 0.9rem;
  font-weight: 600;
}

.timeline-content h3 {
  font-size: 1.3rem;
  margin: 0.5rem 0;
  color: var(--text-dark);
}

.timeline-org {
  color: var(--text-light);
  font-style: italic;
  margin-bottom: 1rem;
}

.timeline-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.highlight-badge {
  background-color: var(--primary-color);
  color: white;
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.highlight-badge.success {
  background-color: var(--accent-color);
}

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

.timeline-details li {
  padding: 0.4rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-light);
}

.timeline-details li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-color);
  font-weight: bold;
}

.cert-list {
  list-style: none;
  margin-top: 0.5rem;
}

.cert-list li {
  padding: 0.5rem 0;
}

.cert-list a {
  color: var(--primary-color);
  text-decoration: none;
  transition: all 0.3s ease;
}

.cert-list a:hover {
  color: var(--secondary-color);
  text-decoration: underline;
}

/* Experience Section */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.exp-item {
  background-color: var(--bg-light);
  padding: 1.5rem;
  border-radius: 10px;
  border-left: 4px solid var(--primary-color);
  transition: all 0.3s ease;
}

.exp-item:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
}

.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.exp-header h3 {
  font-size: 1.3rem;
  color: var(--text-dark);
}

.exp-date {
  color: var(--text-light);
  font-size: 0.9rem;
  font-weight: 600;
}

.exp-company {
  color: var(--text-light);
  font-style: italic;
  margin-bottom: 0.75rem;
}

.exp-highlights {
  list-style: none;
  margin-top: 0.75rem;
}

.exp-highlights li {
  padding: 0.3rem 0;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text-light);
}

.exp-highlights li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
  font-size: 1.2rem;
}

.exp-summary {
  color: var(--text-light);
  margin-top: 0.5rem;
}

/* Praktikum CTA */
.praktikum-cta {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  border-radius: 12px;
  padding: 3rem 2rem;
  margin-bottom: 2rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

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

.cta-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.9;
}

.cta-text h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta-text p {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  opacity: 0.95;
}

.cta-benefit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-size: 1.1rem;
  margin: 0.75rem 0;
}

.cta-benefit i {
  color: var(--accent-color);
  font-size: 1.3rem;
}

/* Contact Form */
.contact-intro {
  text-align: center;
  margin-bottom: 2rem;
}

.contact-intro p {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.contact-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--accent-color);
  font-weight: 600;
}

.contact-form-wrapper {
  background-color: var(--bg-light);
  padding: 2rem;
  border-radius: 12px;
  margin-bottom: 3rem;
  border: 2px solid var(--border-color);
}

.contact-form {
  max-width: 700px;
  margin: 0 auto;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

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

.form-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.875rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.3s ease;
  background-color: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.checkbox-group {
  margin: 1.5rem 0;
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  font-weight: normal;
}

.checkbox-label input[type="checkbox"] {
  width: auto;
  margin-top: 0.25rem;
  cursor: pointer;
}

.btn-submit {
  width: 100%;
  padding: 1rem 2rem;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.btn-submit:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.form-status {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
  font-weight: 600;
}

.form-status .success {
  background-color: #d1fae5;
  color: #065f46;
  padding: 1rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.form-status .error {
  background-color: #fee2e2;
  color: #991b1b;
  padding: 1rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.contact-alternatives {
  text-align: center;
  margin: 3rem 0;
  padding: 2rem;
  background-color: var(--bg-light);
  border-radius: 12px;
}

.contact-alternatives h3 {
  font-size: 1.3rem;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
}

.contact-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.3s ease;
}

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

.contact-btn.linkedin {
  background-color: #0077b5;
}

.contact-btn.linkedin:hover {
  background-color: #005885;
}

.contact-btn.github {
  background-color: #24292e;
}

.contact-btn.github:hover {
  background-color: #1a1e21;
}

.contact-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.contact-info-card {
  background-color: var(--bg-light);
  padding: 1.5rem;
  border-radius: 10px;
  text-align: center;
  border: 2px solid var(--border-color);
}

.contact-info-card i {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 0.75rem;
}

.contact-info-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.contact-info-card p {
  color: var(--text-light);
  line-height: 1.6;
}

/* Footer */
.footer {
  background-color: var(--text-dark);
  color: white;
  text-align: center;
  padding: 2rem;
  margin-top: 3rem;
}

.footer p {
  margin: 0.5rem 0;
  opacity: 0.9;
}

.footer-tagline {
  font-size: 0.9rem;
  opacity: 0.7;
}

.footer-links {
  margin-top: 1rem;
  display: flex;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  font-size: 0.9rem;
}

.footer-links a {
  color: white;
  text-decoration: none;
  opacity: 0.8;
  transition: opacity 0.3s;
}

.footer-links a:hover {
  opacity: 1;
  text-decoration: underline;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(16, 185, 129, 0);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero-name {
    font-size: 2rem;
  }
  
  .hero-title {
    font-size: 1.2rem;
  }
  
  .section {
    padding: 1.5rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .container {
    padding: 1rem;
  }
  
  .projects-grid,
  .skills-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  /* Fix Achievement Badge */
  .achievement-badge {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
    padding: 1.5rem 1rem;
  }
  
  .badge-icon {
    font-size: 2.5rem;
  }
  
  .badge-content h3 {
    font-size: 1.2rem;
  }
  
  .badge-content p {
    font-size: 1.1rem;
  }
  
  /* Fix Project Cards */
  .projects-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .project-card {
    padding: 1.5rem;
    width: 100%;
    overflow: hidden;
  }
  
  .project-icon {
    font-size: 2.5rem;
  }
  
  .project-card h3 {
    font-size: 1.3rem;
  }
  
  .project-tech {
    gap: 0.4rem;
  }
  
  .project-tech span {
    font-size: 0.8rem;
    padding: 0.2rem 0.6rem;
  }
  
  .cta-text h2 {
    font-size: 1.75rem;
  }
  
  .exp-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .contact-form-wrapper {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 2rem 1rem;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .btn-primary,
  .btn-secondary {
    width: 100%;
  }
  
  /* Extra small screens - Achievement Badge */
  .achievement-badge {
    padding: 1rem;
  }
  
  .badge-icon {
    font-size: 2rem;
  }
  
  .badge-content h3 {
    font-size: 1.1rem;
  }
  
  .badge-content p {
    font-size: 1rem;
  }
  
  /* Extra small screens - Project Cards */
  .project-card {
    padding: 1rem;
  }
  
  .project-card h3 {
    font-size: 1.2rem;
    word-break: break-word;
  }
  
  .project-card > p {
    font-size: 0.95rem;
  }
  
  .section {
    padding: 1rem;
  }
  
  .section-title {
    font-size: 1.3rem;
    flex-wrap: wrap;
  }
  
  .contact-links {
    flex-direction: column;
  }
  
  .contact-btn {
    width: 100%;
  }
}

.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(69, 170, 253, 0.13);
  justify-content: center;
  align-items: center;
  z-index: 999;
}

.modal-content {
  background: var(--primary-color);
  position: relative;
  padding: 20px 30px;
  max-width: 400px;
  border-radius: 10px;
  text-align: center;
  font-family: sans-serif;
  font-weight: bold;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  color: white;
}

.close {
  position: absolute;
  top: 8px;
  right: 8px;
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
}