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

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border-color: #e5e7eb;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --success-color: #10b981;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.dark {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --accent-color: #60a5fa;
  --accent-hover: #3b82f6;
  --success-color: #34d399;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

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

/* Header & Navigation */
header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
  padding: 0.5rem 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-color);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-menu-button {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-primary);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Typography */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

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

/* Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

/* Grid */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-cols-1 {
  grid-template-columns: repeat(1, 1fr);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent-color);
  color: white;
  text-decoration: none;
  border-radius: 0.375rem;
  font-weight: 500;
  transition: background-color 0.2s;
  border: none;
  cursor: pointer;
}

.btn:hover {
  background-color: var(--accent-hover);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 0;
  background: linear-gradient(135deg, var(--accent-color) 0%, #8b5cf6 100%);
  color: white;
  border-radius: 1rem;
  margin-bottom: 3rem;
}

.hero h1 {
  color: white;
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.25rem;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-radius: 9999px;
  font-size: 0.875rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

.badge-success {
  background-color: var(--success-color);
  color: white;
}

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

/* Skills Grid */
.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* Experience Timeline */
.timeline-item {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 12px;
  height: 12px;
  background-color: var(--accent-color);
  border-radius: 50%;
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 1.5rem;
  width: 2px;
  height: calc(100% + 1rem);
  background-color: var(--border-color);
}

.timeline-item:last-child::after {
  display: none;
}

/* Blog & Gallery Filters */
.filters {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1rem;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

/* Search */
.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.375rem;
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-color);
}

/* Gallery */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: 0.5rem;
  cursor: pointer;
}

.gallery-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.3s;
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  color: white;
  padding: 1rem;
  transform: translateY(100%);
  transition: transform 0.3s;
}

.gallery-item:hover .gallery-overlay {
  transform: translateY(0);
}

/* Contact Links */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.2s;
}

.contact-link:hover {
  background-color: var(--bg-secondary);
  border-color: var(--accent-color);
}

/* Footer */
footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  margin-top: 4rem;
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .mobile-menu-button {
    display: block;
  }
  
  .mobile-menu-button:hover {
  background-color: var(--bg-secondary);
  border-color: var(--accent-color);
  } 

  .mobile-menu {
    display: flex;
    padding: 1rem;
    background-color: var(--bg-card);
    border-top: 1px solid var(--border-color);
  }
  
  .mobile-menu.active {
    display: block;
  }
  
  .mobile-menu ul {
    list-style: none;
    padding: 0;
  }
  
  .mobile-menu li {
    padding: 0.75rem 0;
  }
  
  .mobile-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    display: block;
  }
  
  .grid-cols-2,
  .grid-cols-3 {
    grid-template-columns: 1fr;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.hidden {
  display: none;
}