:root {
  /* Dark theme (default) */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-gradient: linear-gradient(to right, #24243e, #302b63, #0f0c29);
  --text-light: #e2e8f0;
  --text-muted: #a0aec0;
  --card-bg: rgba(255, 255, 255, 0.1);
  --card-border: rgba(255, 255, 255, 0.2);
  --navbar-bg: rgba(15, 12, 41, 0.9);
  --footer-bg: rgba(15, 12, 41, 0.9);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --shadow-light: rgba(0, 0, 0, 0.3);
  --scrollbar-track: #1a1a2e;
  --scrollbar-thumb: #667eea;
  --scrollbar-thumb-hover: #764ba2;
}

@media (prefers-color-scheme: light) {
  :root {
    /* Light theme */
    --bg-gradient: linear-gradient(to right, #f8fafc, #e2e8f0, #cbd5e1);
    --text-light: #1a202c;
    --text-muted: #4a5568;
    --card-bg: rgba(255, 255, 255, 0.8);
    --card-border: rgba(102, 126, 234, 0.2);
    --navbar-bg: rgba(248, 250, 252, 0.9);
    --footer-bg: rgba(248, 250, 252, 0.9);
    --shadow-color: rgba(102, 126, 234, 0.15);
    --shadow-light: rgba(0, 0, 0, 0.1);
    --scrollbar-track: #e2e8f0;
  }
}

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

body {
  background: var(--bg-gradient);
  color: var(--text-light);
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

/* Navigation */
.navbar {
  backdrop-filter: blur(10px);
  background: var(--navbar-bg) !important;
  box-shadow: 0 4px 20px var(--shadow-light);
}

.navbar-brand {
  font-family: 'Permanent Marker', cursive;
  font-size: 1.8rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-link {
  color: var(--text-light) !important;
  font-weight: 500;
  transition: all 0.3s ease;
}

.nav-link:hover {
  color: #667eea !important;
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  padding: 120px 0 80px;
  text-align: center;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.3rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero .intro {
  font-size: 1.1rem;
  max-width: 800px;
  margin: 0 auto 3rem;
  line-height: 1.8;
}

/* Profile Image */
.profile-container {
  position: relative;
  display: inline-block;
  margin-bottom: 3rem;
}

.profile-img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 4px solid rgba(102, 126, 234, 0.3);
  transition: all 0.3s ease;
  object-fit: cover;
}

.profile-img:hover {
  transform: scale(1.05);
  border-color: #667eea;
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

/* Skills Section */
.skills {
  padding: 80px 0;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.skill-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 15px;
  padding: 2rem;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.skill-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px var(--shadow-color);
  border-color: #667eea;
}

.skill-card h4 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
  color: #667eea;
}

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

.skill-tag {
  background: rgba(102, 126, 234, 0.2);
  color: var(--text-light);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  border: 1px solid rgba(102, 126, 234, 0.3);
  transition: all 0.3s ease;
}

.skill-tag:hover {
  background: rgba(102, 126, 234, 0.4);
  transform: scale(1.05);
}

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

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

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 3rem;
  font-size: 1.1rem;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 2.5rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px var(--shadow-color);
  border-color: #667eea;
}

.project-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #667eea;
}

.project-description {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

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

.tech-tag {
  background: rgba(118, 75, 162, 0.2);
  color: var(--text-light);
  padding: 0.4rem 0.8rem;
  border-radius: 15px;
  font-size: 0.85rem;
  border: 1px solid rgba(118, 75, 162, 0.3);
}

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

.btn-project {
  background: var(--primary-gradient);
  border: none;
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-project:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
  color: white;
}

.btn-secondary {
  background: transparent;
  border: 2px solid #667eea;
  color: #667eea;
}

.btn-secondary:hover {
  background: #667eea;
  color: white;
}

/* Contact Section */
.contact {
  padding: 80px 0;
  text-align: center;
}

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

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-light);
  text-decoration: none;
  font-size: 1.1rem;
  transition: all 0.3s ease;
}

.contact-link:hover {
  color: #667eea;
  transform: translateY(-2px);
}

.contact-link i {
  font-size: 1.3rem;
}

/* Footer */
.footer {
  background: var(--footer-bg);
  padding: 3rem 0;
  text-align: center;
  border-top: 1px solid var(--card-border);
}

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

.social-link {
  color: var(--text-muted);
  font-size: 2rem;
  transition: all 0.3s ease;
}

.social-link:hover {
  color: #667eea;
  transform: translateY(-3px);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }

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

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

  .project-card {
    padding: 1.5rem;
  }

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

/* Smooth scrolling */
html {
  scroll-behavior: smooth;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}