/* CSS Custom Properties for Theming */
:root {
  /* Light theme colors */
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-light: #60a5fa;
  
  --color-background: #ffffff;
  --color-background-secondary: #f8fafc;
  --color-background-tertiary: #f1f5f9;
  
  --color-text-primary: #1e293b;
  --color-text-secondary: #475569;
  --color-text-tertiary: #64748b;
  
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  
  --color-gradient-from: #3b82f6;
  --color-gradient-to: #8b5cf6;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --blur-backdrop: blur(8px);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Dark theme colors */
[data-theme="dark"] {
  --color-primary: #60a5fa;
  --color-primary-dark: #3b82f6;
  --color-primary-light: #93c5fd;
  
  --color-background: #0f172a;
  --color-background-secondary: #1e293b;
  --color-background-tertiary: #334155;
  
  --color-text-primary: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-tertiary: #94a3b8;
  
  --color-border: #334155;
  --color-border-light: #475569;
  
  --color-gradient-from: #60a5fa;
  --color-gradient-to: #a78bfa;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.3), 0 8px 10px -6px rgb(0 0 0 / 0.3);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-background);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* Gradient Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 100vh;
  background: linear-gradient(135deg, var(--color-gradient-from) 0%, var(--color-gradient-to) 100%);
  opacity: 0.03;
  z-index: -1;
  transition: opacity var(--transition-normal);
}

[data-theme="dark"] body::before {
  opacity: 0.05;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

/* Layout Components */
.main-container {
  min-height: 100vh;
  padding: 2rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.content-wrapper {
  margin-top: 2rem;
}

/* Header Styles */
.header {
  margin-bottom: 3rem;
}

.header-content {
  background: var(--color-background);
  border-radius: 1.5rem;
  padding: 2.5rem;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
  backdrop-filter: var(--blur-backdrop);
  transition: all var(--transition-normal);
}

.header-content:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.profile-section {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.profile-image-container {
  position: relative;
}

.profile-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-normal);
}

.profile-image:hover {
  transform: scale(1.05);
}

.profile-info {
  flex: 1;
}

.profile-name {
  background: linear-gradient(135deg, var(--color-gradient-from), var(--color-gradient-to));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.profile-title {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

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

.profile-link {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  border-radius: 2rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.profile-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: white;
}

.profile-bio {
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.profile-bio p {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* Navigation */
.navigation {
  position: sticky;
  top: 2rem;
  z-index: 100;
  margin-bottom: 3rem;
}

.nav-list {
  display: flex;
  justify-content: center;
  list-style: none;
  background: var(--color-background);
  border-radius: 3rem;
  padding: 0.5rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  backdrop-filter: var(--blur-backdrop);
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: block;
  padding: 0.75rem 1.5rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  border-radius: 2rem;
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  transform: translateY(-1px);
}

/* Section Styles */
.section {
  margin-bottom: 4rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-gradient-from), var(--color-gradient-to));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 1rem;
}

/* Card Styles */
.card {
  background: var(--color-background);
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
  backdrop-filter: var(--blur-backdrop);
}

/* More compact cards for projects */
.project-card {
  padding: 1.25rem;
}

.project-card .card-title {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

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

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  flex: 1;
}

.card-date {
  font-size: 0.875rem;
  color: var(--color-primary);
  font-weight: 500;
  background: var(--color-background-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  white-space: nowrap;
}

.card-content {
  color: var(--color-text-secondary);
}

.institution,
.company {
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

/* Grid Layouts */
.cards-container {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

.competencies-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.projects-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(2, 1fr);
}

/* About Section Layout (for side-by-side sections) */
.about-row {
  display: flex;
  gap: 2rem;
  margin-bottom: 1rem;
}

.about-col {
  flex: 1;
  background: var(--color-background);
  border-radius: 1.5rem;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  backdrop-filter: var(--blur-backdrop);
  transition: all var(--transition-normal);
}

.about-col:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.about-col h3 {
  margin-top: 0;
  color: var(--color-text-primary);
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
  text-align: center;
  font-weight: 600;
}

/* Skills List */
.skills-list {
  list-style: none;
}

.skill-item {
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--color-background-secondary);
  border-radius: 0.75rem;
  border-left: 4px solid var(--color-primary);
}

.skill-name {
  font-weight: 600;
  color: var(--color-text-primary);
}

.skill-description {
  color: var(--color-text-secondary);
}

/* Compact Items (for Education/Experience) */
.compact-items {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.compact-item {
  padding: 0.75rem 1rem;
  background: var(--color-background-secondary);
  border-radius: 0.75rem;
  border-left: 4px solid var(--color-primary);
  transition: all var(--transition-normal);
}

.compact-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.compact-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.25rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.compact-title {
  font-weight: 600;
  color: var(--color-text-primary);
  font-size: 1rem;
  flex: 1;
  min-width: 0;
}

.compact-date {
  font-size: 0.875rem;
  color: var(--color-primary);
  font-weight: 500;
  background: var(--color-background-tertiary);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  white-space: nowrap;
}

.compact-institution {
  font-weight: 500;
  color: var(--color-primary);
  font-size: 0.9rem;
}

/* Project Styles */
.project-description {
  margin-bottom: 1rem;
  line-height: 1.6;
  font-size: 0.95rem;
}

.project-impact {
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.impact-label {
  font-weight: 600;
  color: var(--color-text-primary);
}

/* Highlight Spans */
.highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 600;
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  top: 2rem;
  right: 2rem;
  z-index: 1000;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: none;
  background: var(--color-background);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  border: 1px solid var(--color-border);
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-xl);
}

/* Scroll to Top */
.scroll-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: white;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(100px);
}

.scroll-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.scroll-to-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.scroll-to-top svg {
  width: 1.25rem;
  height: 1.25rem;
}

/* Personal Projects Specific Styles */
.project-technologies {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.tech-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-background-tertiary);
  color: var(--color-text-secondary);
  border-radius: 1rem;
  font-size: 0.75rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  border: 1px solid var(--color-border);
}

.tech-tag:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-1px);
}

.project-links {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border-light);
}

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

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--color-background-secondary);
  color: var(--color-text-primary);
  text-decoration: none;
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.project-link svg {
  width: 1rem;
  height: 1rem;
  transition: transform var(--transition-fast);
}

.project-link:hover svg {
  transform: scale(1.1);
}

.live-link {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  border-color: var(--color-primary);
}

.live-link:hover {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  transform: translateY(-2px) scale(1.02);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
}

@media (max-width: 768px) {
  .main-container {
    padding: 1rem;
  }
  
  .header-content {
    padding: 1.5rem;
  }
  
  .profile-section {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }
  
  .profile-name {
    font-size: 2rem;
  }
  
  .profile-links {
    justify-content: center;
  }
  
  .nav-list {
    flex-wrap: wrap;
    justify-content: center;
    padding: 0.5rem;
  }
  
  .nav-link {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .competencies-grid {
    grid-template-columns: 1fr;
  }
  
  /* About section mobile adjustments */
  .about-row {
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .about-col {
    padding: 1.5rem;
  }
  
  /* Compact layout mobile adjustments */
  .compact-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
  
  .compact-date {
    align-self: flex-start;
  }
  
  .theme-toggle,
  .scroll-to-top {
    width: 2.5rem;
    height: 2.5rem;
  }
  
  .theme-toggle {
    top: 1rem;
    right: 1rem;
  }
  
  .scroll-to-top {
    bottom: 1rem;
    right: 1rem;
  }
}

@media (max-width: 480px) {
  .profile-image {
    width: 100px;
    height: 100px;
  }
  
  .profile-name {
    font-size: 1.75rem;
  }
  
  .section-title {
    font-size: 1.25rem;
  }
}

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

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

/* Smooth transitions for theme switching */
* {
  transition: background-color var(--transition-normal), 
              color var(--transition-normal), 
              border-color var(--transition-normal),
              box-shadow var(--transition-normal);
}