/* 
 * Hands On STEM Labs - Modern UI Theme
 * Main CSS File
 */

:root {
  /* Color Variables */
  --hosl-primary: #2563eb;
  --hosl-primary-dark: #1d4ed8;
  --hosl-secondary: #10b981;
  --hosl-secondary-dark: #059669;
  --hosl-accent: #8b5cf6;
  --hosl-accent-dark: #7c3aed;
  
  /* Subject Colors */
  --hosl-physics: #3b82f6;
  --hosl-chemistry: #10b981;
  --hosl-biology: #ef4444;
  --hosl-mathematics: #f59e0b;
  --hosl-stem: #8b5cf6;
  
  /* Neutral Colors */
  --hosl-dark: #1f2937;
  --hosl-dark-800: #374151;
  --hosl-dark-700: #4b5563;
  --hosl-gray-600: #6b7280;
  --hosl-gray-400: #9ca3af;
  --hosl-gray-300: #d1d5db;
  --hosl-gray-200: #e5e7eb;
  --hosl-gray-100: #f3f4f6;
  --hosl-white: #ffffff;
  
  /* Spacing */
  --hosl-space-xs: 0.25rem;
  --hosl-space-sm: 0.5rem;
  --hosl-space-md: 1rem;
  --hosl-space-lg: 1.5rem;
  --hosl-space-xl: 2rem;
  --hosl-space-2xl: 3rem;
  --hosl-space-3xl: 4rem;
  
  /* Typography */
  --hosl-font-sans: 'Poppins', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --hosl-font-heading: 'Poppins', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --hosl-font-mono: 'Roboto Mono', monospace;
  
  /* Font Sizes */
  --hosl-text-xs: 0.75rem;
  --hosl-text-sm: 0.875rem;
  --hosl-text-base: 1rem;
  --hosl-text-lg: 1.125rem;
  --hosl-text-xl: 1.25rem;
  --hosl-text-2xl: 1.5rem;
  --hosl-text-3xl: 1.875rem;
  --hosl-text-4xl: 2.25rem;
  --hosl-text-5xl: 3rem;
  
  /* Border Radius */
  --hosl-radius-sm: 0.25rem;
  --hosl-radius-md: 0.5rem;
  --hosl-radius-lg: 0.75rem;
  --hosl-radius-xl: 1rem;
  --hosl-radius-2xl: 1.5rem;
  --hosl-radius-full: 9999px;
  
  /* Shadows */
  --hosl-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --hosl-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --hosl-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --hosl-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --hosl-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --hosl-transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --hosl-transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

/* body {
  font-family: var(--hosl-font-sans);
  line-height: 1.6;
  color: var(--hosl-dark);
  background: var(--hosl-gray-100);
  min-height: 100vh;
  overflow-x: hidden;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
} */

/* Layout */
.hosl-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--hosl-space-lg);
}

.hosl-section {
  margin: var(--hosl-space-2xl) 0;
  padding: var(--hosl-space-xl);
  background-color: var(--hosl-white);
  border-radius: var(--hosl-radius-lg);
  box-shadow: var(--hosl-shadow-md);
}

/* Typography */
.hosl-title {
  font-family: var(--hosl-font-heading);
  font-size: var(--hosl-text-4xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--hosl-space-md);
  color: var(--hosl-dark);
}

.hosl-subtitle {
  font-size: var(--hosl-text-xl);
  font-weight: 400;
  color: var(--hosl-gray-600);
  margin-bottom: var(--hosl-space-lg);
}

.hosl-heading-2 {
  font-family: var(--hosl-font-heading);
  font-size: var(--hosl-text-3xl);
  font-weight: 600;
  margin-bottom: var(--hosl-space-lg);
  color: var(--hosl-dark);
  position: relative;
  padding-bottom: var(--hosl-space-sm);
}

.hosl-heading-2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--hosl-primary);
  border-radius: var(--hosl-radius-full);
}

.hosl-heading-3 {
  font-family: var(--hosl-font-heading);
  font-size: var(--hosl-text-2xl);
  font-weight: 600;
  margin: var(--hosl-space-lg) 0 var(--hosl-space-md);
  color: var(--hosl-dark);
}

.hosl-heading-4 {
  font-family: var(--hosl-font-heading);
  font-size: var(--hosl-text-xl);
  font-weight: 600;
  margin: var(--hosl-space-md) 0;
  color: var(--hosl-dark);
}

.hosl-text {
  font-size: var(--hosl-text-base);
  margin-bottom: var(--hosl-space-md);
  color: var(--hosl-dark-700);
}

.hosl-text-sm {
  font-size: var(--hosl-text-sm);
}

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

/* Header */
.hosl-header {
  text-align: center;
  margin-bottom: var(--hosl-space-2xl);
  padding: var(--hosl-space-3xl) var(--hosl-space-xl);
  background: linear-gradient(135deg, var(--hosl-primary) 0%, var(--hosl-accent) 100%);
  border-radius: var(--hosl-radius-lg);
  color: var(--hosl-white);
  position: relative;
  overflow: hidden;
  box-shadow: var(--hosl-shadow-xl);
}

.hosl-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('../images/pattern.svg');
  opacity: 0.1;
  z-index: 0;
}

.hosl-header * {
  position: relative;
  z-index: 1;
}

/* Navigation */
.hosl-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--hosl-space-md) 0;
  margin-bottom: var(--hosl-space-xl);
}

.hosl-logo {
  font-size: var(--hosl-text-2xl);
  font-weight: 700;
  color: var(--hosl-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--hosl-space-sm);
}

.hosl-nav-links {
  display: flex;
  gap: var(--hosl-space-lg);
  list-style: none;
}

.hosl-nav-link {
  color: var(--hosl-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--hosl-transition-fast);
}

.hosl-nav-link:hover {
  color: var(--hosl-primary);
}

.hosl-nav-link.active {
  color: var(--hosl-primary);
  font-weight: 600;
}

/* Buttons */
.hosl-btn {
  display: inline-block;
  padding: var(--hosl-space-sm) var(--hosl-space-lg);
  background-color: var(--hosl-primary);
  color: var(--hosl-white);
  border: none;
  border-radius: var(--hosl-radius-md);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--hosl-transition-fast);
  text-align: center;
}

.hosl-btn:hover {
  background-color: var(--hosl-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--hosl-shadow-md);
}

.hosl-btn-secondary {
  background-color: var(--hosl-secondary);
}

.hosl-btn-secondary:hover {
  background-color: var(--hosl-secondary-dark);
}

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

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

.hosl-btn-lg {
  padding: var(--hosl-space-md) var(--hosl-space-xl);
  font-size: var(--hosl-text-lg);
}

/* Cards */
.hosl-card {
  background-color: var(--hosl-white);
  border-radius: var(--hosl-radius-lg);
  padding: var(--hosl-space-lg);
  box-shadow: var(--hosl-shadow-md);
  transition: transform var(--hosl-transition-normal), box-shadow var(--hosl-transition-normal);
}

.hosl-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--hosl-shadow-lg);
}

/* Subject Cards */
.hosl-subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--hosl-space-lg);
  margin: var(--hosl-space-xl) 0;
}

.hosl-subject-card {
  background-color: var(--hosl-white);
  border-radius: var(--hosl-radius-lg);
  padding: var(--hosl-space-lg);
  box-shadow: var(--hosl-shadow-md);
  transition: all var(--hosl-transition-normal);
  position: relative;
  overflow: hidden;
  border-top: 4px solid var(--hosl-primary);
}

.hosl-subject-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--hosl-shadow-xl);
}

.hosl-subject-card-physics {
  border-color: var(--hosl-physics);
}

.hosl-subject-card-chemistry {
  border-color: var(--hosl-chemistry);
}

.hosl-subject-card-biology {
  border-color: var(--hosl-biology);
}

.hosl-subject-card-mathematics {
  border-color: var(--hosl-mathematics);
}

.hosl-subject-icon {
  font-size: var(--hosl-text-4xl);
  margin-bottom: var(--hosl-space-md);
  display: inline-block;
}

.hosl-subject-title {
  font-size: var(--hosl-text-xl);
  font-weight: 600;
  margin-bottom: var(--hosl-space-md);
  color: var(--hosl-dark);
}

.hosl-subject-features {
  list-style: none;
  margin: var(--hosl-space-md) 0;
}

.hosl-subject-features li {
  padding: var(--hosl-space-xs) 0;
  position: relative;
  padding-left: var(--hosl-space-lg);
  color: var(--hosl-dark-700);
}

.hosl-subject-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--hosl-secondary);
  font-weight: bold;
}

.hosl-subject-link {
  display: inline-block;
  margin-top: var(--hosl-space-md);
  color: var(--hosl-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--hosl-transition-fast);
}

.hosl-subject-link:hover {
  color: var(--hosl-primary-dark);
  transform: translateX(5px);
}

/* Benefits Section */
.hosl-benefits {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--hosl-space-lg);
  margin: var(--hosl-space-xl) 0;
}

.hosl-benefit-card {
  background-color: var(--hosl-white);
  border-radius: var(--hosl-radius-lg);
  padding: var(--hosl-space-lg);
  box-shadow: var(--hosl-shadow-md);
  transition: all var(--hosl-transition-normal);
  border-left: 4px solid var(--hosl-accent);
}

.hosl-benefit-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--hosl-shadow-lg);
}

.hosl-benefit-icon {
  font-size: var(--hosl-text-3xl);
  margin-bottom: var(--hosl-space-md);
  color: var(--hosl-accent);
  display: inline-block;
}

/* Contact Section */
.hosl-contact-info {
  background-color: var(--hosl-gray-100);
  border-radius: var(--hosl-radius-lg);
  padding: var(--hosl-space-lg);
  margin: var(--hosl-space-lg) 0;
}

.hosl-contact-details {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--hosl-space-md);
  margin-top: var(--hosl-space-lg);
}

.hosl-contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--hosl-space-md);
  margin-bottom: var(--hosl-space-md);
}

.hosl-contact-icon {
  font-size: var(--hosl-text-xl);
  color: var(--hosl-primary);
  width: 24px;
  text-align: center;
}

.hosl-contact-text {
  flex: 1;
}

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

.hosl-contact-text a:hover {
  color: var(--hosl-primary-dark);
  text-decoration: underline;
}

/* CTA Section */
.hosl-cta-section {
  background: linear-gradient(135deg, var(--hosl-dark) 0%, var(--hosl-dark-800) 100%);
  color: var(--hosl-white);
  text-align: center;
  padding: var(--hosl-space-2xl);
  border-radius: var(--hosl-radius-lg);
  margin: var(--hosl-space-2xl) 0;
}

.hosl-cta-section .hosl-heading-2 {
  color: var(--hosl-white);
}

.hosl-cta-section .hosl-heading-2::after {
  background: var(--hosl-secondary);
}

.hosl-cta-section .hosl-text {
  color: var(--hosl-gray-300);
  max-width: 700px;
  margin: 0 auto var(--hosl-space-xl);
}

.hosl-cta-button {
  display: inline-block;
  background-color: var(--hosl-white);
  color: var(--hosl-dark);
  padding: var(--hosl-space-md) var(--hosl-space-xl);
  border-radius: var(--hosl-radius-full);
  text-decoration: none;
  font-weight: 600;
  margin: var(--hosl-space-md) var(--hosl-space-sm);
  transition: all var(--hosl-transition-normal);
}

.hosl-cta-button:hover {
  background-color: var(--hosl-secondary);
  color: var(--hosl-white);
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Lab-specific styles */
.hosl-back-button {
  display: inline-flex;
  align-items: center;
  gap: var(--hosl-space-sm);
  padding: var(--hosl-space-sm) var(--hosl-space-md);
  background-color: var(--hosl-gray-200);
  color: var(--hosl-dark);
  text-decoration: none;
  border-radius: var(--hosl-radius-md);
  margin-bottom: var(--hosl-space-lg);
  transition: all var(--hosl-transition-fast);
}

.hosl-back-button:hover {
  background-color: var(--hosl-gray-300);
  transform: translateX(-5px);
}

.hosl-lab-image {
  width: 100%;
  height: 250px;
  background: linear-gradient(135deg, var(--hosl-primary) 0%, var(--hosl-accent) 100%);
  border-radius: var(--hosl-radius-lg);
  margin: var(--hosl-space-lg) 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--hosl-white);
  font-size: var(--hosl-text-5xl);
  box-shadow: var(--hosl-shadow-lg);
}

.hosl-highlight {
  background: linear-gradient(120deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  padding: var(--hosl-space-lg);
  border-radius: var(--hosl-radius-lg);
  margin: var(--hosl-space-lg) 0;
  border-left: 5px solid var(--hosl-primary);
}

.hosl-equipment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--hosl-space-lg);
  margin: var(--hosl-space-xl) 0;
}

.hosl-equipment-card {
  background-color: var(--hosl-white);
  border: 1px solid var(--hosl-gray-200);
  border-radius: var(--hosl-radius-lg);
  padding: var(--hosl-space-lg);
  transition: all var(--hosl-transition-normal);
  position: relative;
  overflow: hidden;
}

.hosl-equipment-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--hosl-primary) 0%, var(--hosl-accent) 100%);
}

.hosl-equipment-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--hosl-shadow-lg);
}

.hosl-features-list {
  list-style: none;
  margin: var(--hosl-space-md) 0;
}

.hosl-features-list li {
  padding: var(--hosl-space-xs) 0;
  position: relative;
  padding-left: var(--hosl-space-lg);
  color: var(--hosl-dark-700);
}

.hosl-features-list li::before {
  content: '⚡';
  position: absolute;
  left: 0;
  color: var(--hosl-primary);
}

.hosl-experiments-section {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(236, 72, 153, 0.1) 100%);
  padding: var(--hosl-space-xl);
  border-radius: var(--hosl-radius-lg);
  margin: var(--hosl-space-xl) 0;
}

.hosl-experiments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--hosl-space-lg);
  margin: var(--hosl-space-lg) 0;
}

.hosl-experiment-item {
  background-color: var(--hosl-white);
  padding: var(--hosl-space-lg);
  border-radius: var(--hosl-radius-lg);
  text-align: center;
  transition: all var(--hosl-transition-normal);
  box-shadow: var(--hosl-shadow-sm);
}

.hosl-experiment-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--hosl-shadow-lg);
}

.hosl-experiment-icon {
  font-size: var(--hosl-text-3xl);
  margin-bottom: var(--hosl-space-md);
  color: var(--hosl-primary);
  display: block;
}

/* Footer */
.hosl-footer {
  text-align: center;
  padding: var(--hosl-space-xl) 0;
  margin-top: var(--hosl-space-3xl);
  border-top: 1px solid var(--hosl-gray-200);
}

.hosl-footer .hosl-text {
  color: var(--hosl-gray-600);
  font-size: var(--hosl-text-sm);
}

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

.hosl-footer a:hover {
  color: var(--hosl-primary-dark);
  text-decoration: underline;
}

/* Responsive Styles */
@media (max-width: 768px) {
  :root {
    --hosl-text-4xl: 2rem;
    --hosl-text-3xl: 1.75rem;
    --hosl-text-2xl: 1.5rem;
    --hosl-text-xl: 1.25rem;
  }
  
  .hosl-container {
    padding: var(--hosl-space-md);
  }
  
  .hosl-header {
    padding: var(--hosl-space-xl) var(--hosl-space-md);
  }
  
  .hosl-subjects-grid,
  .hosl-benefits,
  .hosl-equipment-grid,
  .hosl-experiments-grid {
    grid-template-columns: 1fr;
  }
  
  .hosl-contact-details {
    grid-template-columns: 1fr;
  }
  
  .hosl-nav {
    flex-direction: column;
    gap: var(--hosl-space-md);
  }
  
  .hosl-nav-links {
    flex-direction: column;
    align-items: center;
    gap: var(--hosl-space-sm);
  }
}

@media (max-width: 480px) {
  .hosl-cta-button {
    display: block;
    margin: var(--hosl-space-md) auto;
    max-width: 80%;
  }
}