:root {
  /* Color palette */
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1e40af;
  --secondary: #10b981;
  --dark: #1e293b;
  --dark-light: #334155;
  --light: #f8fafc;
  --light-dark: #e2e8f0;
  --gray: #94a3b8;
  --danger: #ef4444;
  --warning: #f59e0b;
  --success: #10b981;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Typography */
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  
  /* Borders */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background-color: var(--light);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

p {
  margin-bottom: var(--space-md);
  color: var(--dark-light);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.2s;
}

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

img {
  max-width: 100%;
  height: auto;
}

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

/* Header & Navigation */
header {
  background-color: #000;
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0 var(--space-xl);
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-group {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-left {
  gap: var(--space-xl);
}

.nav-right {
  margin-left: auto;
}

.nav-logo {
  font-weight: 700;
  font-size: var(--text-xl);
  color: white;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-logo svg {
  width: 24px;
  height: 24px;
  color: var(--primary-light);
}

.nav-link {
  font-weight: 500;
  color: white;
  padding: var(--space-sm) 0;
  position: relative;
  opacity: 0.9;
}

.nav-link:hover {
  color: white;
  opacity: 1;
  text-decoration: none;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-light);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link.active {
  opacity: 1;
}

.nav-link.active::after {
  width: 100%;
}

/* Main content */
main {
  flex: 1;
  padding: var(--space-xl);
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* Hero section */
.hero {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
  margin-bottom: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
  padding: var(--space-2xl) 0;
}

.hero h1 {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}

.hero p {
  font-size: var(--text-xl);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  opacity: 0.9;
}

/* Featured Tools */
.featured-tools {
  padding: var(--space-2xl) 0;
  background-color: var(--light);
}

/* Tool filters */
.tool-filters {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.tool-filters button {
  background-color: white;
  border: 1px solid var(--light-dark);
  border-radius: var(--radius-full);
  padding: var(--space-xs) var(--space-md);
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 500;
  font-size: var(--text-sm);
}

.tool-filters button:hover {
  background-color: var(--light-dark);
}

.tool-filters button.active {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin: 0 auto;
}

.tool-card {
  background-color: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  opacity: 1;
  transition: opacity 0.2s ease, transform 0.3s ease;
}

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

.tool-card-image {
  height: 180px;
  background-color: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--light-dark);
}

.tool-card-image svg {
  width: 72px;
  height: 72px;
  color: var(--primary);
}

.tool-card-content {
  padding: var(--space-lg);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.tool-card h3 {
  color: var(--dark);
  margin-bottom: var(--space-sm);
  font-size: var(--text-lg);
}

.tool-card p {
  color: var(--dark-light);
  margin-bottom: var(--space-lg);
  flex-grow: 1;
  font-size: var(--text-sm);
}

.tool-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.tool-tag {
  background-color: var(--light-dark);
  color: var(--dark);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tool-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--primary);
  font-weight: 500;
  font-size: var(--text-sm);
  transition: all 0.2s;
}

.tool-link:hover {
  color: var(--primary-dark);
  text-decoration: none;
}

.tool-link svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s;
}

.tool-link:hover svg {
  transform: translateX(3px);
}

/* Footer */
footer {
  background-color: #000;
  color: white;
  padding: var(--space-xl) 0;
  margin-top: auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-links a {
  color: white;
  opacity: 0.7;
  font-size: var(--text-sm);
}

.footer-links a:hover {
  opacity: 1;
  text-decoration: none;
}

/* About page specific styles */
.about-container {
  padding-top: var(--space-xl);
}

.about-section {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--light-dark);
}

.about-description {
  max-width: 800px;
  font-size: var(--text-lg);
}

.updates-section {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--light-dark);
}

.update-post {
  background-color: white;
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease;
}

.update-post:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.update-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}

.update-header h3 {
  color: var(--primary);
  margin-bottom: 0;
}

.update-header time {
  color: var(--gray);
  font-size: var(--text-sm);
  font-weight: 500;
}

.update-content p {
  margin-bottom: 0;
}

.roadmap-section {
  padding: var(--space-2xl) 0;
}

.roadmap-list {
  list-style: none;
  display: grid;
  gap: var(--space-md);
}

.roadmap-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background-color: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.roadmap-badge {
  background-color: var(--light-dark);
  color: var(--dark);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
}

.roadmap-badge[data-status="in-development"] {
  background-color: var(--primary-light);
  color: white;
}

/* Responsive adjustments for about page */
@media (max-width: 768px) {
  .update-header {
      flex-direction: column;
      align-items: flex-start;
      gap: var(--space-xs);
  }
  
  .update-header time {
      margin-top: var(--space-xs);
  }
  
  .roadmap-item {
      flex-direction: column;
      align-items: flex-start;
  }
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --text-3xl: 1.75rem;
    --text-2xl: 1.5rem;
    --text-xl: 1.25rem;
  }
  
  header {
    padding: 0 var(--space-md);
  }
  
  .nav-container {
    padding: 0 var(--space-md);
  }
  
  .nav-group {
    gap: var(--space-lg);
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
  
  .footer-links {
    justify-content: center;
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .nav-group {
    gap: var(--space-md);
  }
  
  .nav-logo span {
    display: none;
  }
  
  main {
    padding: var(--space-lg);
  }
  
  .tool-filters {
    justify-content: center;
  }
}