/* ============================================
   DataShanks Insights - Main Stylesheet
   Modern, Clean, Responsive Design
   ============================================ */

/* CSS Variables for Design System */
:root {
  /* Colors */
  --primary-blue: #2563eb;
  --secondary-cyan: #0891b2;
  --accent-amber: #f59e0b;
  --dark-slate: #1e293b;
  --medium-slate: #475569;
  --light-slate: #cbd5e1;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #475569;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --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);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;
  
  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

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

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-light);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--secondary-cyan);
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--dark-slate);
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

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

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

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

/* ============================================
   Navigation
   ============================================ */

.navbar {
  background-color: var(--bg-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-blue);
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--secondary-cyan);
}

.nav-logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-cyan));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.25rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  color: var(--text-primary);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.nav-link:hover {
  color: var(--primary-blue);
  background-color: rgba(37, 99, 235, 0.1);
}

.nav-link.active {
  color: var(--primary-blue);
  background-color: rgba(37, 99, 235, 0.1);
}

/* Mobile Menu Toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.nav-toggle span {
  width: 24px;
  height: 3px;
  background-color: var(--dark-slate);
  border-radius: 2px;
  transition: all var(--transition-base);
}

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

.hero {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-cyan) 100%);
  color: white;
  padding: var(--spacing-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  color: white;
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-tagline {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-categories {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

.category-badge {
  background-color: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: all var(--transition-base);
}

.category-badge:hover {
  background-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

/* ============================================
   Blog Grid
   ============================================ */

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.blog-card {
  background-color: var(--bg-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.blog-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: linear-gradient(135deg, var(--primary-blue), var(--secondary-cyan));
}

.blog-card-content {
  padding: var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-card-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary-blue);
  margin-bottom: var(--spacing-xs);
}

.blog-card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--dark-slate);
}

.blog-card-title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

.blog-card-title a:hover {
  color: var(--primary-blue);
}

.blog-card-excerpt {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
  flex: 1;
}

.blog-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--medium-slate);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--light-slate);
}

.blog-card-date {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.blog-card-reading-time {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

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

.footer {
  background-color: var(--dark-slate);
  color: white;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
  color: white;
  font-size: 1.125rem;
  margin-bottom: var(--spacing-md);
}

.footer-section p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9375rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: white;
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: all var(--transition-base);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

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

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-tagline {
    font-size: 1rem;
  }
  
  .nav-menu {
    position: fixed;
    top: 60px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 60px);
    background-color: var(--bg-white);
    flex-direction: column;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transition: left var(--transition-slow);
    align-items: flex-start;
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .blog-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .hero {
    padding: var(--spacing-lg) 0;
  }
  
  .hero-categories {
    flex-direction: column;
    align-items: center;
  }
}

/* ============================================
   Utility Classes
   ============================================ */

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

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background-color: var(--primary-blue);
  color: white;
}

.btn-primary:hover {
  background-color: var(--secondary-cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  background-color: var(--primary-blue);
  color: white;
}

/* Made with Bob */