/* =================================================================
   FOSSEE Workshop Enhanced CSS
   Mobile-first responsive design with modern UI/UX principles
   ================================================================= */

/* CSS Custom Properties (Variables) */
:root {
  /* Colors */
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  
  /* Neutral Colors */
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, 'Courier New', monospace;
  
  /* Font Sizes - Fluid Typography */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --text-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --text-3xl: clamp(1.875rem, 1.6rem + 1.375vw, 2.5rem);
  --text-4xl: clamp(2.25rem, 1.9rem + 1.75vw, 3rem);
  --text-5xl: clamp(3rem, 2.5rem + 2.5vw, 4rem);
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Layout */
  --max-width: 1280px;
  --container-padding: clamp(1rem, 4vw, 2rem);
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Shadows */
  --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);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-tooltip: 1050;
}

/* =================================================================
   Reset and Base Styles
   ================================================================= */

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

*:before,
*:after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--gray-700);
  background-color: var(--white);
  overflow-x: hidden;
  min-height: 100vh;
}

/* Improve text rendering */
body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Focus styles for accessibility */
*:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

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

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: var(--white);
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

/* =================================================================
   Typography
   ================================================================= */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  color: var(--gray-900);
  margin-bottom: var(--space-4);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
  margin-bottom: var(--space-4);
}

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

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

/* =================================================================
   Layout Components
   ================================================================= */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* =================================================================
   Header and Navigation
   ================================================================= */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  z-index: var(--z-fixed);
  transition: all var(--transition-normal);
}

.navbar {
  padding: var(--space-4) 0;
}

.navbar-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  z-index: var(--z-fixed);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--gray-900);
  font-weight: 600;
  font-size: var(--text-lg);
  text-decoration: none;
}

.brand-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: var(--text-lg);
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: var(--z-fixed);
}

.hamburger-line {
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 1px;
  transition: all var(--transition-normal);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  color: var(--gray-600);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
  background: var(--gray-50);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 6px;
  background: var(--primary-color);
  border-radius: 50%;
}

/* Dropdown */
.dropdown {
  position: relative;
}

.dropdown-arrow {
  font-size: var(--text-xs);
  transition: transform var(--transition-fast);
}

.dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  min-width: 200px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-normal);
  list-style: none;
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  color: var(--gray-600);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.dropdown-link:hover {
  color: var(--primary-color);
  background: var(--gray-50);
}

.navbar-cta {
  margin-left: var(--space-4);
}

/* =================================================================
   Buttons
   ================================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Button Variants */
.btn-primary {
  background: var(--primary-color);
  color: var(--white);
  border-color: var(--primary-color);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-700);
  border-color: var(--gray-200);
}

.btn-secondary:hover {
  background: var(--gray-200);
  color: var(--gray-800);
}

.btn-outline {
  background: transparent;
  color: var(--gray-600);
  border-color: var(--gray-300);
}

.btn-outline:hover {
  background: var(--gray-50);
  color: var(--gray-700);
}

/* Button Sizes */
.btn-large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

.btn-small {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

/* =================================================================
   Main Content
   ================================================================= */

.main-content {
  margin-top: 80px; /* Offset for fixed header */
}

/* =================================================================
   Hero Section
   ================================================================= */

.hero {
  padding: var(--space-24) 0;
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23e2e8f0" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  opacity: 0.5;
}

.hero-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  position: relative;
  z-index: 1;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.hero-title {
  font-size: var(--text-5xl);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  color: var(--gray-900);
}

.highlight {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--text-lg);
  color: var(--gray-600);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--primary-color);
  line-height: 1;
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--gray-500);
  margin-top: var(--space-1);
}

/* Hero Visual */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 400px;
}

.tech-circle {
  width: 120px;
  height: 120px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: var(--text-3xl);
  box-shadow: var(--shadow-xl);
  position: relative;
  z-index: 2;
}

.floating-card {
  position: absolute;
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 500;
  animation: float 6s ease-in-out infinite;
}

.floating-card i {
  font-size: var(--text-xl);
  color: var(--primary-color);
}

.card-1 {
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.card-2 {
  top: 20%;
  right: 10%;
  animation-delay: 2s;
}

.card-3 {
  bottom: 20%;
  left: 20%;
  animation-delay: 4s;
}

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

/* =================================================================
   Sections
   ================================================================= */

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--gray-900);
}

.section-description {
  font-size: var(--text-lg);
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}

/* =================================================================
   Workshop Section
   ================================================================= */

.workshops {
  padding: var(--space-24) 0;
}

.workshop-filters {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-12);
  gap: var(--space-4);
  flex-wrap: wrap;
}

.search-box {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.search-box i {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
}

.search-box input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-12);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
}

.search-box input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.filter-tabs {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.filter-tab {
  padding: var(--space-2) var(--space-4);
  background: transparent;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  color: var(--gray-600);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.workshop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

.workshop-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  transition: all var(--transition-normal);
  position: relative;
}

.workshop-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--gray-300);
}

.workshop-image {
  position: relative;
  padding: var(--space-8);
  background: linear-gradient(135deg, var(--gray-50), var(--gray-100));
  text-align: center;
}

.workshop-image i {
  font-size: var(--text-4xl);
  color: var(--primary-color);
  margin-bottom: var(--space-4);
}

.workshop-badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: var(--primary-color);
  color: var(--white);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 500;
}

.workshop-content {
  padding: var(--space-6);
}

.workshop-title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--gray-900);
}

.workshop-description {
  color: var(--gray-600);
  margin-bottom: var(--space-4);
  line-height: 1.6;
}

.workshop-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
}

.workshop-level,
.workshop-participants {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--gray-500);
}

.workshop-actions {
  display: flex;
  gap: var(--space-3);
}

.workshop-actions .btn {
  flex: 1;
}

.bookmark-btn {
  flex: 0 0 auto;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
}

.load-more-container {
  text-align: center;
}

/* =================================================================
   Statistics Section
   ================================================================= */

.statistics {
  padding: var(--space-24) 0;
  background: var(--gray-50);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-16);
}

.stat-card {
  background: var(--white);
  padding: var(--space-8);
  border-radius: var(--radius-2xl);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-4);
  color: var(--white);
  font-size: var(--text-xl);
}

.stat-number {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-base);
  color: var(--gray-600);
  margin-bottom: var(--space-2);
}

.stat-change {
  font-size: var(--text-sm);
  color: var(--success-color);
  font-weight: 500;
}

.chart-container {
  background: var(--white);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.chart-header h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--gray-900);
}

.chart-filters {
  display: flex;
  gap: var(--space-2);
}

.chart-filter {
  padding: var(--space-2) var(--space-4);
  background: transparent;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  color: var(--gray-600);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.chart-placeholder {
  height: 300px;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
}

/* =================================================================
   CTA Section
   ================================================================= */

.cta-section {
  padding: var(--space-24) 0;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: var(--white);
  text-align: center;
}

.cta-title {
  font-size: var(--text-4xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
  color: var(--white);
}

.cta-description {
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
  opacity: 0.9;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

.cta-section .btn-primary {
  background: var(--white);
  color: var(--primary-color);
  border-color: var(--white);
}

.cta-section .btn-primary:hover {
  background: var(--gray-100);
  border-color: var(--gray-100);
}

.cta-section .btn-outline {
  background: transparent;
  color: var(--white);
  border-color: var(--white);
}

.cta-section .btn-outline:hover {
  background: var(--white);
  color: var(--primary-color);
}

/* =================================================================
   Footer
   ================================================================= */

.footer {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand h3 {
  color: var(--white);
  margin-bottom: var(--space-4);
}

.footer-brand p {
  color: var(--gray-400);
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.footer-column h4 {
  color: var(--white);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: var(--space-2);
}

.footer-column a {
  color: var(--gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--white);
}

.footer-social h4 {
  color: var(--white);
  margin-bottom: var(--space-4);
}

.social-links {
  display: flex;
  gap: var(--space-3);
}

.social-link {
  width: 40px;
  height: 40px;
  background: var(--gray-800);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--primary-color);
  color: var(--white);
  transform: translateY(-2px);
}

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid var(--gray-800);
  text-align: center;
  color: var(--gray-500);
  font-size: var(--text-sm);
}

.footer-bottom p {
  margin-bottom: var(--space-2);
}

/* =================================================================
   Utility Components
   ================================================================= */

.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: var(--white);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: var(--z-fixed);
}

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

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.loading-indicator {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.loading-indicator.active {
  opacity: 1;
  visibility: visible;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-200);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* =================================================================
   Dark Mode Toggle Styles
   ================================================================= */

.theme-toggle {
  position: relative;
  margin-left: 1rem;
  display: flex;
  align-items: center;
}

.theme-btn {
  position: relative;
  width: 80px;
  height: 36px;
  background: var(--gray-200, #e5e7eb);
  border: none;
  border-radius: 18px;
  cursor: pointer;
  transition: all 0.3s ease;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px;
}

.theme-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.theme-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  border-radius: 50%;
  transition: all 0.3s ease;
  z-index: 2;
}

.theme-slider {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 28px;
  height: 28px;
  background: white;
  border-radius: 50%;
  transition: all 0.3s ease;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  z-index: 1;
}

.theme-btn[data-theme="light"] .theme-slider {
  transform: translateX(0);
}

.theme-btn[data-theme="dark"] .theme-slider {
  transform: translateX(24px);
  background: #1e293b;
}

.theme-btn[data-theme="auto"] .theme-slider {
  transform: translateX(48px);
  background: linear-gradient(45deg, white 50%, #1e293b 50%);
}

/* =================================================================
   Responsive Design
   ================================================================= */

/* Tablet Styles */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--space-12);
    text-align: center;
  }
  
  .hero-visual {
    order: -1;
    height: 300px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile Styles */
@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
  }
  
  /* Header Mobile */
  .navbar-toggle {
    display: flex;
  }
  
  /* Theme Toggle Mobile */
  .theme-toggle {
    margin-left: 0.5rem;
    order: -1; /* Show before hamburger menu */
  }
  
  .theme-btn {
    width: 60px;
    height: 30px;
    border-radius: 15px;
    padding: 3px;
  }
  
  .theme-icon {
    width: 24px;
    height: 24px;
    font-size: 12px;
  }
  
  .theme-slider {
    width: 24px;
    height: 24px;
    top: 3px;
    left: 3px;
  }
  
  .theme-btn[data-theme="dark"] .theme-slider {
    transform: translateX(18px);
  }
  
  .theme-btn[data-theme="auto"] .theme-slider {
    transform: translateX(36px);
  }
  
  .navbar-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    flex-direction: column;
    justify-content: center;
    padding: var(--space-8);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    z-index: calc(var(--z-fixed) - 1);
  }
  
  .navbar-menu.active {
    transform: translateX(0);
  }
  
  .navbar-nav {
    flex-direction: column;
    width: 100%;
    margin-bottom: var(--space-8);
  }
  
  .nav-link {
    justify-content: center;
    padding: var(--space-4);
    font-size: var(--text-lg);
    width: 100%;
  }
  
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    margin-top: var(--space-2);
  }
  
  .navbar-cta {
    margin: 0;
    width: 100%;
  }
  
  .navbar-cta .btn {
    width: 100%;
  }
  
  /* Hamburger Animation */
  .navbar-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .navbar-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
  }
  
  .navbar-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  /* Hero Mobile */
  .hero {
    padding: var(--space-16) 0;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-actions .btn {
    width: 100%;
    max-width: 280px;
  }
  
  /* Workshop Filters Mobile */
  .workshop-filters {
    flex-direction: column;
    align-items: stretch;
  }
  
  .search-box {
    max-width: none;
  }
  
  .filter-tabs {
    justify-content: center;
  }
  
  .workshop-grid {
    grid-template-columns: 1fr;
  }
  
  /* Stats Mobile */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Chart Mobile */
  .chart-header {
    flex-direction: column;
    align-items: stretch;
  }
  
  .chart-filters {
    justify-content: center;
  }
  
  /* CTA Mobile */
  .cta-actions {
    flex-direction: column;
    align-items: center;
  }
  
  .cta-actions .btn {
    width: 100%;
    max-width: 280px;
  }
  
  /* Footer Mobile */
  .footer-links {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .social-links {
    justify-content: center;
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .floating-card {
    display: none;
  }
  
  .hero-visual {
    height: 200px;
  }
  
  .tech-circle {
    width: 80px;
    height: 80px;
    font-size: var(--text-xl);
  }
}

/* =================================================================
   Print Styles
   ================================================================= */

@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  .header,
  .navbar-toggle,
  .back-to-top,
  .loading-indicator {
    display: none;
  }
  
  .main-content {
    margin-top: 0;
  }
  
  a,
  a:visited {
    text-decoration: underline;
  }
}

/* =================================================================
   Reduced Motion
   ================================================================= */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .floating-card {
    animation: none;
  }
}