/* Custom CSS for enhanced styling with dark/light theme support */

/* Custom properties for theme colors */
:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --success-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  
  /* Light theme colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  
  /* Animation variables */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Dark theme colors */
.dark {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --border-color: #475569;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.4);
}

/* Global styles */
* {
  box-sizing: border-box;
}

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

/* Enhanced header with gradient and animation */
header {
  background: var(--primary-gradient) !important;
  position: relative;
  overflow: hidden;
}

header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

/* Enhanced project cards */
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: 0 4px 6px var(--shadow-color);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.project-card:hover::before {
  transform: scaleX(1);
}

.project-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 25px var(--shadow-hover);
  border-color: transparent;
}

/* Enhanced images */
.project-image {
  border-radius: 12px;
  transition: transform var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.project-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
}

.project-card:hover .project-image::after {
  transform: translateX(100%);
}

/* Enhanced tags */
.tag {
  background: var(--accent-gradient);
  color: white;
  font-weight: 500;
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 0.75rem;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.tag::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left var(--transition-slow);
}

.tag:hover::before {
  left: 100%;
}

.tag:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

/* Enhanced buttons */
.btn-primary {
  background: var(--primary-gradient);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 12px 24px;
  font-weight: 600;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left var(--transition-slow);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

/* Enhanced modal */
.modal-overlay {
  backdrop-filter: blur(8px);
  background: rgba(0, 0, 0, 0.6);
}

.modal-content {
  background: var(--bg-card);
  border-radius: 20px;
  border: 1px solid var(--border-color);
  box-shadow: 0 25px 50px var(--shadow-hover);
}

/* Enhanced theme toggle */
.theme-toggle {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  box-shadow: 0 4px 12px var(--shadow-color);
  transition: all var(--transition-normal);
}

.theme-toggle:hover {
  transform: scale(1.1) rotate(180deg);
  box-shadow: 0 8px 20px var(--shadow-hover);
}

/* Loading animation */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-color);
  border-radius: 50%;
  border-top-color: var(--primary-gradient);
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Enhanced typography */
h1, h2, h3 {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header h1 {
  color: #f0f6ff;
  background: none;
  -webkit-background-clip: initial;
  -webkit-text-fill-color: initial;
}

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

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

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

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

/* Responsive enhancements */
@media (max-width: 768px) {
  .project-card:hover {
    transform: translateY(-4px) scale(1.01);
  }
  
  .theme-toggle:hover {
    transform: scale(1.05) rotate(90deg);
  }
}

/* Focus states for accessibility */
button:focus,
a:focus {
  outline: 2px solid var(--accent-gradient);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .theme-toggle,
  .modal-overlay {
    display: none !important;
  }
  
  .project-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}