/* Enhanced Portfolio Styling - Typography, Colors, and Visual Improvements */

/* Import Google Fonts for better typography */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* Enhanced CSS Custom Properties for better theming */
:root {
  /* Enhanced Color Palette */
  --primary-color: #0d6efd;
  --primary-hover: #0b5ed7;
  --secondary-color: #6c757d;
  --success-color: #198754;
  --info-color: #0dcaf0;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  
  /* Dark Theme Colors */
  --bg-gradient: linear-gradient(135deg, #0f0f23 0%, #1a0033 50%, #000d33 100%);
  --card-bg: #1a1a2e;
  --card-bg-secondary: #16213e;
  --text-color: #ffffff;
  --text-secondary: #b8c5d6;
  --text-muted: #8892b0;
  --nav-bg: rgba(15, 15, 35, 0.95);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(13, 110, 253, 0.5);
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-medium: rgba(0, 0, 0, 0.2);
  --shadow-heavy: rgba(0, 0, 0, 0.3);
  
  /* Accessibility Colors - WCAG AA Compliant */
  --focus-color: #0d6efd;
  --focus-shadow: rgba(13, 110, 253, 0.25);
  --error-color: #dc3545;
  --success-color-accessible: #198754;
  --warning-color-accessible: #fd7e14;
  
  /* Enhanced Typography Scale */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Enhanced Spacing Scale */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 0.75rem;   /* 12px */
  --spacing-lg: 1rem;      /* 16px */
  --spacing-xl: 1.5rem;    /* 24px */
  --spacing-2xl: 2rem;     /* 32px */
  --spacing-3xl: 2.5rem;   /* 40px */
  --spacing-4xl: 3rem;     /* 48px */
  --spacing-5xl: 4rem;     /* 64px */
  --spacing-6xl: 5rem;     /* 80px */
  
  /* Border Radius Scale */
  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 9999px;
  
  /* Enhanced Animation Properties */
  --transition-fast: 0.15s ease-out;
  --transition-normal: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
  --transition-bounce: 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Light Theme Colors */
body.light-mode {
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #cbd5e1 100%);
  --card-bg: #ffffff;
  --card-bg-secondary: #f8fafc;
  --text-color: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --nav-bg: rgba(255, 255, 255, 0.95);
  --border-color: rgba(0, 0, 0, 0.1);
  --border-hover: rgba(13, 110, 253, 0.3);
  --shadow-light: rgba(0, 0, 0, 0.05);
  --shadow-medium: rgba(0, 0, 0, 0.1);
  --shadow-heavy: rgba(0, 0, 0, 0.15);
  
  /* Light theme accessibility colors */
  --focus-color: #0d6efd;
  --focus-shadow: rgba(13, 110, 253, 0.25);
  --error-color: #dc3545;
  --success-color-accessible: #198754;
  --warning-color-accessible: #fd7e14;
}

/* Ensure all text elements respect theme colors */
body.light-mode h1,
body.light-mode h2,
body.light-mode h3,
body.light-mode h4,
body.light-mode h5,
body.light-mode h6 {
  color: var(--text-color) !important;
}

body.light-mode p,
body.light-mode .lead,
body.light-mode .card-text,
body.light-mode .hero-subtitle {
  color: var(--text-secondary) !important;
}

body.light-mode .text-muted,
body.light-mode .text-small {
  color: var(--text-muted) !important;
}

body.light-mode .navbar-brand,
body.light-mode .card-title,
body.light-mode .skill-category-title,
body.light-mode .filter-title {
  color: var(--text-color) !important;
}

body.light-mode .nav-link {
  color: var(--text-secondary) !important;
}

body.light-mode .nav-link:hover,
body.light-mode .nav-link:focus {
  color: var(--primary-color) !important;
}

body.light-mode .skill-badge {
  color: var(--text-color) !important;
  background: var(--card-bg-secondary) !important;
}

body.light-mode .filter-btn {
  color: var(--text-secondary) !important;
  background: var(--card-bg-secondary) !important;
}

body.light-mode .theme-toggle {
  color: var(--text-color) !important;
  background: var(--card-bg-secondary) !important;
}

body.light-mode footer p {
  color: var(--text-secondary) !important;
}

/* Accessibility Enhancements */

/* Skip Link for Screen Readers */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: 4px;
  z-index: 9999;
  font-weight: 600;
  transition: top 0.3s ease;
}

.skip-link:focus {
  top: 6px;
  outline: 2px solid var(--focus-color);
  outline-offset: 2px;
}

/* Screen Reader Only Content */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.sr-only-focusable:focus {
  position: static !important;
  width: auto !important;
  height: auto !important;
  padding: inherit !important;
  margin: inherit !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
}

/* Enhanced Focus Indicators */
*:focus {
  outline: 2px solid var(--focus-color);
  outline-offset: 2px;
}

/* Remove default focus for mouse users, keep for keyboard users */
*:focus:not(:focus-visible) {
  outline: none;
}

*:focus-visible {
  outline: 2px solid var(--focus-color);
  outline-offset: 2px;
}

/* Form Validation Styles */
.form-control.is-invalid {
  border-color: var(--error-color);
  box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

.form-control.is-valid {
  border-color: var(--success-color-accessible);
  box-shadow: 0 0 0 0.2rem rgba(25, 135, 84, 0.25);
}

.invalid-feedback {
  display: none;
  width: 100%;
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: var(--error-color);
}

.form-control.is-invalid ~ .invalid-feedback {
  display: block;
}

.valid-feedback {
  display: none;
  width: 100%;
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: var(--success-color-accessible);
}

.form-control.is-valid ~ .valid-feedback {
  display: block;
}

/* Error State Styling */
.error-state {
  border: 2px solid var(--error-color);
  background-color: rgba(220, 53, 69, 0.1);
}

.error-message {
  color: var(--error-color);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.error-message::before {
  content: "⚠";
  font-weight: bold;
}

/* Loading State */
.loading-state {
  position: relative;
  pointer-events: none;
  opacity: 0.7;
}

.loading-state::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Image Error Handling */
.image-placeholder {
  background: var(--card-bg-secondary);
  border: 2px dashed var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  text-align: center;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
}

.image-error {
  background: rgba(220, 53, 69, 0.1);
  border-color: var(--error-color);
  color: var(--error-color);
}

/* No Results State */
.no-results {
  text-align: center;
  padding: var(--spacing-4xl);
  color: var(--text-muted);
}

.no-results-icon {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.no-results-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.no-results-message {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-xl);
}

/* Keyboard Navigation Enhancements */
.keyboard-navigation {
  outline: 2px solid var(--focus-color);
  outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --border-color: currentColor;
    --shadow-light: transparent;
    --shadow-medium: transparent;
    --shadow-heavy: transparent;
    --focus-color: #000080;
  }
  
  body.light-mode {
    --focus-color: #000080;
  }
}

/* Enhanced Base Typography */
body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--text-color);
  background: var(--bg-gradient);
  background-attachment: fixed;
  scroll-behavior: smooth;
  transition: background var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Enhanced Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-primary);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--text-color);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.025em;
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-2xl);
}

h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xl);
}

h3 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-lg);
}

h4 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-md);
}

h5 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-sm);
}

h6 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-sm);
}

/* Enhanced Paragraph and Text Styles */
p {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.lead {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-light);
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
}

.text-small {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.text-large {
  font-size: var(--font-size-lg);
}

/* Code and Monospace Text */
code, pre, .font-mono {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

/* Enhanced Hero Section Typography */
.hero-title {
  font-size: clamp(var(--font-size-4xl), 5vw, var(--font-size-5xl));
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  background: linear-gradient(135deg, var(--primary-color), var(--info-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xl);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-light);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-2xl);
}

/* Enhanced Section Spacing */
section {
  padding: var(--spacing-6xl) 0;
}

section:first-of-type {
  padding-top: calc(var(--spacing-6xl) + 80px); /* Account for fixed navbar */
}

/* Enhanced Container Spacing */
.container {
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
  }
}

@media (min-width: 1200px) {
  .container {
    padding-left: var(--spacing-2xl);
    padding-right: var(--spacing-2xl);
  }
}

/* Enhanced Navigation Styling */
.navbar {
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
  padding: var(--spacing-lg) 0;
}

.navbar-brand {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color) !important;
  letter-spacing: -0.025em;
}

.nav-link {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary) !important;
  padding: var(--spacing-sm) var(--spacing-lg) !important;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link:focus {
  color: var(--primary-color) !important;
  background-color: rgba(13, 110, 253, 0.1);
}

.nav-link.active {
  color: var(--primary-color) !important;
  background-color: rgba(13, 110, 253, 0.15);
}

/* Enhanced Card Styling */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: 0 4px 6px var(--shadow-light);
  transition: all var(--transition-normal);
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px var(--shadow-medium);
  border-color: var(--border-hover);
}

.card-body {
  padding: var(--spacing-xl);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color);
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-tight);
}

.card-text {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

/* Enhanced Button Styling */
.btn {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  border: none;
  transition: all var(--transition-fast);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  line-height: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  color: white;
  box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(13, 110, 253, 0.4);
  background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
}

.btn-outline-primary {
  background: transparent;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.btn-outline-primary:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(13, 110, 253, 0.3);
}

/* Enhanced Badge Styling */
.badge {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  letter-spacing: 0.025em;
  text-transform: uppercase;
}

/* Enhanced Form Styling */
.form-control {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background-color: var(--card-bg);
  color: var(--text-color);
  transition: all var(--transition-fast);
}

.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.1);
  outline: none;
}

.form-control::placeholder {
  color: var(--text-muted);
  font-weight: var(--font-weight-normal);
}

/* Enhanced Project Card Specific Styling */
.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-normal);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-12px);
  box-shadow: 0 25px 50px var(--shadow-heavy);
  border-color: var(--primary-color);
}

.project-card .card-img-top {
  height: 220px;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .card-img-top {
  transform: scale(1.08);
}

.project-card .card-body {
  flex: 1;
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
}

.project-card .card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  color: var(--text-color);
}

.project-card .card-text {
  flex: 1;
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

/* Enhanced Technology Tags */
.tech-tag {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  background: rgba(13, 110, 253, 0.1);
  color: var(--primary-color);
  border: 1px solid rgba(13, 110, 253, 0.2);
  transition: all var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin: var(--spacing-xs);
}

.tech-tag:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(13, 110, 253, 0.3);
}

/* Enhanced Skills Section */
.skills-wrapper {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.skill-category-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--border-color);
}

.skill-badge {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  background: var(--card-bg-secondary);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin: var(--spacing-xs);
}

.skill-badge:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(13, 110, 253, 0.3);
  border-color: var(--primary-color);
}

/* Enhanced Filter System */
.filter-container {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-3xl);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.filter-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-color);
  margin-bottom: var(--spacing-xl);
}

.filter-group-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.filter-btn {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  background: var(--card-bg-secondary);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
  margin: var(--spacing-xs);
}

.filter-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-light);
}

.filter-btn.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(13, 110, 253, 0.3);
}

/* Enhanced Footer */
footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-3xl) 0;
  margin-top: var(--spacing-6xl);
}

footer p {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

footer a {
  color: var(--primary-color);
  font-size: var(--font-size-2xl);
  margin: 0 var(--spacing-lg);
  transition: all var(--transition-fast);
}

footer a:hover {
  color: var(--primary-hover);
  transform: translateY(-3px);
}

/* Enhanced Theme Toggle */
.theme-toggle {
  background: var(--card-bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-color);
  font-size: var(--font-size-lg);
  padding: var(--spacing-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
  transform: rotate(180deg);
}

/* Enhanced Responsive Typography */
@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;   /* Smaller on mobile */
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  section {
    padding: var(--spacing-4xl) 0;
  }
  
  .container {
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
  }
  
  .card-body {
    padding: var(--spacing-lg);
  }
  
  .filter-container,
  .skills-wrapper {
    padding: var(--spacing-xl);
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  section {
    padding: var(--spacing-3xl) 0;
  }
  
  .container {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }
}

/* Enhanced Animation Performance */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .project-card:hover,
  .btn:hover,
  .tech-tag:hover,
  .skill-badge:hover {
    transform: none !important;
  }
}

/* Performance optimizations for low-end devices */
@media (max-width: 768px) and (max-resolution: 150dpi) {
  .project-card:hover {
    transform: translateY(-2px) !important;
  }
  
  .enhanced-hover:hover {
    transform: translateY(-2px) !important;
  }
  
  .tech-tag:hover {
    transform: scale(1.02) !important;
  }
}

/* GPU acceleration for critical animations */
.project-card,
.enhanced-hover,
.tech-tag,
.filter-btn,
.btn {
  will-change: transform;
  backface-visibility: hidden;
  perspective: 1000px;
}

/* Containment for better performance */
.project-card {
  contain: layout style paint;
}

.skills-wrapper {
  contain: layout style;
}

.filter-container {
  contain: layout style;
}

/* Lazy loading image styles */
.lazy-load {
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lazy-load.loaded {
  opacity: 1;
}

.image-placeholder {
  background: var(--card-bg-secondary);
  border: 2px dashed var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  text-align: center;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  min-height: 220px;
}

.image-error {
  background: rgba(220, 53, 69, 0.1);
  border-color: var(--error-color);
  color: var(--error-color);
}

/* Performance mode styles */
.low-performance .enhanced-hover:hover,
.low-performance .project-card:hover {
  transform: none !important;
  box-shadow: 0 4px 6px var(--shadow-light) !important;
}

.low-performance .tech-tag:hover,
.low-performance .filter-btn:hover {
  transform: none !important;
}

.low-performance .animate-fade-in,
.low-performance .animate-slide-up,
.low-performance .animate-scale-in {
  animation: none !important;
  opacity: 1 !important;
  transform: none !important;
}

/* Enhanced High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --border-color: currentColor;
    --shadow-light: transparent;
    --shadow-medium: transparent;
    --shadow-heavy: transparent;
  }
  
  .card,
  .btn,
  .form-control,
  .tech-tag,
  .skill-badge,
  .filter-btn {
    border-width: 2px;
    border-style: solid;
  }
  
  .hero-title {
    -webkit-text-fill-color: unset;
    background: unset;
    color: var(--text-color);
  }
}

/* Enhanced Print Styles */
@media print {
  body {
    background: white !important;
    color: black !important;
  }
  
  .navbar,
  .theme-toggle,
  footer,
  .filter-container {
    display: none !important;
  }
  
  .project-card,
  .card {
    break-inside: avoid;
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
  
  a {
    text-decoration: underline !important;
  }
  
  .hero-title {
    -webkit-text-fill-color: black !important;
    background: none !important;
    color: black !important;
  }
}