/* CSS Variables for Light/Dark Theme */
:root {
  --bg-primary: #f8f9fa;
  --bg-secondary: white;
  --bg-tertiary: #f8f9fa;
  --text-primary: #333;
  --text-secondary: #6c757d;
  --text-accent: #2c3e50;
  --border-color: #e9ecef;
  --border-accent: #3498db;
  --hover-bg: #e9ecef;
  --shadow: rgba(0,0,0,0.1);
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

[data-theme="dark"] {
  --bg-primary: #242424;
  --bg-secondary: #363636;
  --bg-tertiary: #484848;
  --text-primary: #e5e5e5;
  --text-secondary: #b0b0b0;
  --text-accent: #8bb8e8;
  --border-color: #505050;
  --border-accent: #6ba3d6;
  --hover-bg: #505050;
  --shadow: rgba(0,0,0,0.4);
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

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

body { 
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif; 
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  line-height: 1.6;
}

.container { 
  max-width: 1200px; 
  width: 100%;
  margin: 0 auto; 
  padding: 20px;
}

/* Hero Section */
.hero {
  background: var(--bg-secondary);
  color: var(--text-primary);
  text-align: center;
  padding: 60px 20px 40px;
  margin-bottom: 60px;
  position: relative;
  border-radius: 0 0 20px 20px;
  box-shadow: 0 4px 20px var(--shadow);
  border: 1px solid var(--border-color);
  border-top: none;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  margin-bottom: 16px;
  font-weight: 600;
  color: var(--text-accent);
  position: relative;
}

.hero h1::after {
  content: '';
  display: block;
  width: 200px;
  height: 3px;
  background: var(--gradient-primary);
  margin: 20px auto 0;
  border-radius: 2px;
}

.hero p {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  margin-bottom: 0;
  color: var(--text-secondary);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

/* Section Headers */
.section {
  margin-bottom: 60px;
}

.section h2 {
  color: var(--text-accent);
  font-size: clamp(1.8rem, 4vw, 2.2rem);
  margin-bottom: 30px;
  text-align: center;
  position: relative;
}

.section h2::after {
  content: '';
  display: block;
  width: 150px;
  height: 3px;
  background: var(--gradient-primary);
  margin: 15px auto 0;
  border-radius: 2px;
}

/* Project Cards */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-bottom: 40px;
}

.project-card {
  background: var(--bg-secondary);
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 10px 30px var(--shadow);
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px var(--shadow);
}

.project-card.featured::before {
  background: var(--gradient-secondary);
}

/* Center the third project card */
.project-card:nth-child(3) {
  grid-column: 1 / -1;
  max-width: 50%;
  margin: 0 auto;
}

.project-card h3 {
  color: var(--text-accent);
  font-size: 1.4rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.project-card p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.project-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 20px;
  font-size: 0.9rem;
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
}

.github-icon {
  width: 16px;
  height: 16px;
  object-fit: contain;
}

.project-link:hover {
  background: var(--hover-bg);
  transform: translateY(-2px);
}

/* Project Tags */
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.project-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.7rem;
  font-weight: 500;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  text-transform: lowercase;
  letter-spacing: 0.3px;
  transition: all 0.2s ease;
  line-height: 1.2;
}

/* Tech Stack */
.tech-stack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
}

.tech-category {
  background: var(--bg-secondary);
  padding: 25px;
  border-radius: 15px;
  box-shadow: 0 5px 20px var(--shadow);
  border: 1px solid var(--border-color);
}

.tech-category h3 {
  color: var(--text-accent);
  margin-bottom: 20px;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tech-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-badge {
  display: inline-block;
  font-size: 0;
}

.tech-badge img {
  height: 28px;
  border-radius: 4px;
  transition: transform 0.2s ease;
}

.tech-badge:hover img {
  transform: scale(1.1);
}

/* GitHub Stats */
.github-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.stat-card {
  background: var(--bg-secondary);
  padding: 20px;
  border-radius: 15px;
  box-shadow: 0 5px 20px var(--shadow);
  border: 1px solid var(--border-color);
  text-align: center;
}

.stat-card img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: none;
  background: var(--bg-secondary);
  box-shadow: 0 4px 20px var(--shadow);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  z-index: 1000;
  border: 2px solid var(--border-color);
  color: var(--text-primary);
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 25px var(--shadow);
}

/* Contact Section */
.contact {
  background: var(--bg-secondary);
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 30px var(--shadow);
  border: 1px solid var(--border-color);
}

.contact h2 {
  margin-bottom: 20px;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  background: var(--gradient-primary);
  color: white;
  text-decoration: none;
  border-radius: 25px;
  font-weight: 500;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
}

.contact-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

/* Toast Container */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1001;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 350px;
}

/* Toast Notification */
.toast {
  background: white;
  color: #333;
  padding: 16px 24px;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  border-left: 4px solid #10b981;
  transform: translateX(400px);
  transition: all 0.3s ease;
  max-width: 100%;
  opacity: 0;
  animation: slideIn 0.3s ease forwards;
}

.toast.removing {
  animation: slideOut 0.3s ease forwards;
}

.toast.success {
  border-left-color: #10b981;
}

.toast .toast-icon {
  margin-right: 8px;
  color: #10b981;
}

@keyframes slideIn {
  from {
      transform: translateX(400px);
      opacity: 0;
  }
  to {
      transform: translateX(0);
      opacity: 1;
  }
}

@keyframes slideOut {
  from {
      transform: translateX(0);
      opacity: 1;
  }
  to {
      transform: translateX(400px);
      opacity: 0;
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero {
      padding: 40px 20px 30px;
      margin-bottom: 40px;
  }

  .container {
      padding: 15px;
  }

  .projects-grid {
      grid-template-columns: 1fr;
      gap: 20px;
  }

  /* Reset third card styling on mobile */
  .project-card:nth-child(3) {
      grid-column: auto;
      max-width: none;
      margin: 0;
  }

  .project-card {
      padding: 20px;
  }

  /* Disable hover effects on mobile */
  .project-card:hover {
      transform: none;
      box-shadow: 0 10px 30px var(--shadow);
  }

  .project-link:hover {
      transform: none;
      background: var(--bg-tertiary);
  }

  .tech-badge:hover img {
      transform: none;
  }

  .contact-link:hover {
      transform: none;
      box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
  }

  .theme-toggle:hover {
      transform: none;
      box-shadow: 0 4px 20px var(--shadow);
  }

  /* Fix title line breaking */
  .hero h1 {
      font-size: clamp(1.8rem, 6vw, 3.2rem);
      white-space: nowrap;
  }

  .tech-stack {
      grid-template-columns: 1fr;
      gap: 20px;
  }

  .contact {
      padding: 30px 20px;
  }

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

  .theme-toggle {
      width: 50px;
      height: 50px;
      bottom: 15px;
      right: 15px;
  }
}

/* Smooth transitions */
* {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}