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

:root {
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --secondary-color: #10b981;
  --text-dark: #1f2937;
  --text-light: #6b7280;
  --text-lighter: #9ca3af;
  --bg-light: #f9fafb;
  --bg-white: #ffffff;
  --border-color: #e5e7eb;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
}

html {
  scroll-behavior: smooth;
}

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

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

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

.nav-link {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width 0.3s ease;
}

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

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

.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all 0.3s ease;
}

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

/* Hero Section */
.hero {
  padding: 120px 0 80px;
  background: linear-gradient(135deg, #f9fafb 0%, #ffffff 100%);
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-title {
  font-family: 'Playfair Display', serif;
  font-size: 3.5rem;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  color: var(--text-dark);
}

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

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: 1rem;
  font-weight: 500;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
}

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

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
}

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

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

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.image-wrapper {
  position: relative;
  width: 350px;
  height: 350px;
}

.image-wrapper::before {
  content: '';
  position: absolute;
  top: -20px;
  left: -20px;
  right: 20px;
  bottom: 20px;
  background: var(--primary-color);
  border-radius: 50%;
  opacity: 0.1;
  z-index: 0;
}

.image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow);
}

/* Section Title */
.section-title {
  font-family: 'Playfair Display', serif;
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--text-dark);
  position: relative;
  padding-bottom: 1rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--primary-color),
    var(--secondary-color)
  );
  border-radius: 2px;
}

/* About Section */
.about {
  padding: 80px 0;
  background: var(--bg-white);
}

.about-content {
  display: grid;
  gap: 3rem;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about-text p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-light);
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.about-card {
  background: var(--bg-light);
  padding: 2rem;
  border-radius: 12px;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

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

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.about-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.about-card p {
  color: var(--text-light);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.year {
  color: var(--primary-color);
  font-weight: 600;
  font-size: 0.9rem;
}

.mt-1 {
  margin-top: 1rem;
}

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

.skills-tags span {
  padding: 0.5rem 1rem;
  background: white;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-dark);
}

/* Experience Section */
.experience {
  padding: 80px 0;
  background: var(--bg-light);
}

.timeline {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 30px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  padding-left: 80px;
  margin-bottom: 3rem;
}

.timeline-marker {
  position: absolute;
  left: 20px;
  top: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  border: 4px solid white;
  box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-content {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.timeline-content:hover {
  box-shadow: var(--shadow);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.timeline-header h3 {
  font-size: 1.5rem;
  color: var(--text-dark);
}

.timeline-date {
  color: var(--primary-color);
  font-weight: 600;
  font-size: 0.95rem;
  background: rgba(99, 102, 241, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
}

.timeline-company {
  color: var(--text-light);
  font-size: 1.1rem;
  margin-bottom: 1rem;
  font-weight: 500;
}

.expandable-content {
  margin-top: 1rem;
}

.expand-trigger {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-color);
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  padding: 0.5rem 0;
  transition: all 0.3s ease;
}

.expand-trigger:hover {
  gap: 0.75rem;
}

.expand-trigger svg {
  transition: transform 0.3s ease;
}

.expand-trigger.active svg {
  transform: rotate(180deg);
}

.expand-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.expand-body.active {
  max-height: 2000px;
}

.detail-section {
  margin-top: 1.5rem;
}

.detail-section h4 {
  color: var(--text-dark);
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.detail-section ul {
  list-style: none;
  padding-left: 0;
}

.detail-section li {
  color: var(--text-light);
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  position: relative;
  line-height: 1.6;
}

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

/* Projects Section */
.projects {
  padding: 80px 0;
  background: white;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.project-card {
  background: var(--bg-light);
  padding: 2rem;
  border-radius: 12px;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

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

.project-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.project-card h3 {
  font-size: 1.4rem;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
}

.project-subtitle {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.project-card p {
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.project-tags span {
  padding: 0.4rem 0.9rem;
  background: white;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

/* Contact Section */
.contact {
  padding: 80px 0;
  background: var(--bg-light);
}

.contact-intro {
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto 3rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.contact-card {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

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

.contact-icon {
  width: 60px;
  height: 60px;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  color: var(--primary-color);
}

.contact-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--text-dark);
}

.contact-card a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.contact-card a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

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

/* Footer */
.footer {
  background: var(--text-dark);
  color: white;
  padding: 2rem 0;
  text-align: center;
}

.footer p {
  color: rgba(255, 255, 255, 0.7);
}

/* Responsive Design */
@media (max-width: 968px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background: white;
    width: 100%;
    text-align: center;
    transition: left 0.3s ease;
    box-shadow: var(--shadow);
    padding: 2rem 0;
  }

  .nav-menu.active {
    left: 0;
  }

  .hamburger {
    display: flex;
  }

  .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(7px, -6px);
  }

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-buttons {
    justify-content: center;
  }

  .image-wrapper {
    width: 280px;
    height: 280px;
  }

  /* About Cards - Center on Mobile */
  .about-cards {
    grid-template-columns: 1fr;
  }

  .about-card {
    text-align: center;
  }

  .card-icon {
    display: block;
    text-align: center;
  }

  .skills-tags {
    justify-content: center;
  }

  /* Timeline - Card Layout on Mobile */
  .timeline::before {
    display: none;
  }

  .timeline-item {
    padding-left: 0;
    margin-bottom: 1.5rem;
  }

  .timeline-marker {
    display: none;
  }

  .timeline-content {
    box-shadow: var(--shadow);
  }

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

@media (max-width: 640px) {
  .container,
  .hero-container {
    padding: 0 1rem;
  }

  .nav-container {
    padding: 1rem;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .section-title {
    font-size: 2rem;
  }

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

  .btn {
    width: 100%;
    text-align: center;
  }

  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .timeline-content {
    padding: 1.5rem;
  }

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