:root {
  --primary-color: #3d67c2;
  --secondary-color: #1e3574;
  --accent-color: #06b6d4;
  --success-color: #10b981;
  --text-primary: #25365f;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --gradient-primary: linear-gradient(10deg, #778dbb 0%, #040e2b 100%);
  --gradient-secondary: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
}

.dark-mode {
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --border-color: #334155;
  --border-light: #475569;
}

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

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-weight: 400;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  padding: 1rem 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.dark-mode .navbar {
  background: rgba(15, 23, 42, 0.8);
}

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

.logo {
  font-weight: 700;
  font-size: 1.5rem;
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.025em;
}

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

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  letter-spacing: -0.01em;
}

.nav-links a:hover {
  color: var(--primary-color);
  transform: translateY(-1px);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform: translateX(-50%);
  border-radius: 1px;
}

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

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 0.625rem;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
  background: var(--bg-secondary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-secondary);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 25% 25%,
      rgba(37, 99, 235, 0.1) 0%,
      transparent 50%),
    radial-gradient(circle at 75% 75%,
      rgba(6, 181, 212, 0.2) 0%,
      transparent 50%);
}

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

.hero-content h1 {
  font-size: 3.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: 1rem;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 1.5rem;
  font-weight: 300;
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 2.5rem;
  line-height: 1.7;
  letter-spacing: -0.01em;
}

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

.btn {
  padding: 0.875rem 2rem;
  border-radius: 0.75rem;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: rgba(255, 255, 255, 0.15);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.btn-primary:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
  background: transparent;
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

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

.hero-image img {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-xl);
}

/* Section Styles */
.section {
  padding: 5rem 0;
}

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

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.03em;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 4rem;
  font-size: 1.125rem;
  font-weight: 400;
  letter-spacing: -0.01em;
}

/* About Section */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-text {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.7;
  letter-spacing: -0.01em;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.skill-item {
  background: var(--bg-card);
  padding: 1.25rem;
  border-radius: 0.875rem;
  border: 1px solid var(--border-color);
  text-align: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
}

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

.skill-item i {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 0.75rem;
  display: block;
}

.skill-item span {
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

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

.project-card {
  background: var(--bg-card);
  border-radius: 1.25rem;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.project-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.project-links {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.project-links a {
  color: var(--primary-color);
  font-size: 1.25rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-links a:hover {
  color: var(--secondary-color);
  transform: scale(1.1);
}

.project-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.project-description {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

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

.tech-tag {
  background: rgba(37, 99, 235, 0.08);
  color: var(--primary-color);
  padding: 0.375rem 0.875rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid rgba(37, 99, 235, 0.15);
  letter-spacing: -0.01em;
}

/* Contact Section */
.contact {
  background: var(--bg-secondary);
}

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

.contact-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  font-size: 1.05rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  letter-spacing: -0.01em;
}

.contact-link:hover {
  color: var(--secondary-color);
  transform: translateY(-1px);
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  text-align: center;
  padding: 2.5rem 0;
  border-top: 1px solid var(--border-color);
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-container {
    gap: 3rem;
    padding: 0 1.5rem;
  }

  .hero-content h1 {
    font-size: 3rem;
  }

  .container {
    padding: 0 1.5rem;
  }
}

@media (max-width: 768px) {
  .nav-container {
    padding: 0 1rem;
  }

  .nav-links {
    gap: 1.5rem;
  }

  .nav-links a {
    font-size: 0.9rem;
  }

  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
    padding: 0 1rem;
  }

  .hero-content h1 {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .hero-image img {
    width: 250px;
    height: 250px;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 2rem;
  }

  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }

  .skill-item {
    padding: 1rem;
  }

  .skill-item i {
    font-size: 1.5rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }

  .contact-link {
    font-size: 1rem;
  }

  .container {
    padding: 0 1rem;
  }

  .section {
    padding: 3rem 0;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }

  .logo {
    font-size: 1.25rem;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .hero-image img {
    width: 200px;
    height: 200px;
  }

  .section-title {
    font-size: 1.75rem;
  }

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

  .project-header {
    padding: 1rem;
  }

  .project-card div:last-child {
    padding: 0 1rem 1rem;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 0 0.75rem;
  }

  .hero-container {
    padding: 0 0.75rem;
  }

  .hero-content h1 {
    font-size: 1.75rem;
  }

  .container {
    padding: 0 0.75rem;
  }

  .section {
    padding: 2.5rem 0;
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .hero-image img {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
  }
}

/* Landscape phones */
@media (max-height: 600px) and (orientation: landscape) {
  .hero {
    min-height: 120vh;
  }

  .hero-container {
    padding: 4rem 1rem;
  }
}