/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Colors - Primary Palette */
  --color-primary: #2563eb;
  --color-secondary: #10b981;
  --color-accent: #f59e0b;
  --color-background: #ffffff;
  --color-surface: #f9fafb;
  --color-text-primary: #111827;
  --color-text-secondary: #6b7280;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;

  /* Type Scale */
  --font-size-h1: 2.5rem;    /* 40px */
  --font-size-h2: 2rem;      /* 32px */
  --font-size-h3: 1.5rem;    /* 24px */
  --font-size-body: 1rem;    /* 16px */
  --font-size-small: 0.875rem; /* 14px */

  /* Line Heights */
  --line-height-heading: 1.2;
  --line-height-body: 1.6;

  /* Spacing System (8px base unit) */
  --spacing-xs: 0.5rem;   /* 8px */
  --spacing-sm: 1rem;     /* 16px */
  --spacing-md: 1.5rem;   /* 24px */
  --spacing-lg: 2rem;     /* 32px */
  --spacing-xl: 3rem;     /* 48px */
  --spacing-2xl: 4rem;    /* 64px */

  /* Breakpoints */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;

  /* Container */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-sm);

  /* Card Design */
  --card-border-radius: 12px;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --card-shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
  --card-padding: var(--spacing-lg);

  /* Transitions */
  --transition-base: all 0.3s ease;
}

/* ============================================
   CSS Reset / Normalize
   ============================================ */

/* Web Font Loading (if using custom fonts)
   Add font-display: swap to ensure text remains visible during font load
   Example:
   @font-face {
     font-family: 'Inter';
     src: url('fonts/inter.woff2') format('woff2');
     font-display: swap;
     font-weight: 400;
     font-style: normal;
   }
*/

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
}

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;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Keyboard Navigation - Focus Styles */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Remove focus outline for mouse users, keep for keyboard users */
a:focus:not(:focus-visible),
button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
textarea:focus:not(:focus-visible),
select:focus:not(:focus-visible) {
  outline: none;
}

/* Ensure focus is visible for keyboard users */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

ul, ol {
  list-style: none;
}

/* ============================================
   Typography and Base Styles
   ============================================ */
body {
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
  background-color: var(--color-background);
}

h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-heading);
  font-weight: 700;
  color: var(--color-text-primary);
}

h1 {
  font-size: var(--font-size-h1);
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
}

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

/* ============================================
   Header Section
   ============================================ */
header {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e40af 100%);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

header h1 {
  color: white;
  margin-bottom: var(--spacing-xs);
  font-size: clamp(1.75rem, 5vw, var(--font-size-h1));
}

header .tagline {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.125rem;
  margin: 0;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  padding: var(--spacing-2xl) 0;
  text-align: center;
  background-color: var(--color-surface);
}

.hero h2 {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.hero p {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

/* ============================================
   Tools Section
   ============================================ */
.tools-section {
  padding: var(--spacing-2xl) 0;
}

.tools-section h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text-primary);
}

/* Tools Grid Layout */
.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

/* Tool Card Styling */
.tool-card {
  background: white;
  border-radius: var(--card-border-radius);
  box-shadow: var(--card-shadow);
  padding: var(--card-padding);
  transition: var(--transition-base);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  /* Ensure adequate spacing between cards for touch targets */
  margin-bottom: var(--spacing-sm);
}

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

/* Tool Icon Area */
.tool-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: var(--card-border-radius);
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-sm);
}

.tool-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Tool Name */
.tool-name {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-h3);
}

/* Tool Description */
.tool-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
}

/* GitHub Link (Button-like) */
.github-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-text-primary);
  color: white;
  border-radius: 6px;
  font-weight: 600;
  transition: var(--transition-base);
  margin-top: var(--spacing-xs);
  /* Ensure minimum 44x44px touch target for mobile */
  min-height: 44px;
  min-width: 44px;
}

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

.github-link:focus {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.github-link:focus:not(:focus-visible) {
  outline: none;
}

.github-link:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.github-link svg {
  flex-shrink: 0;
}

/* ============================================
   Footer Section
   ============================================ */
footer {
  background-color: var(--color-text-primary);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
  margin-top: var(--spacing-2xl);
}

footer p {
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-small);
}

footer p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Responsive Design - Mobile First
   ============================================ */

/* Base styles above are mobile-first (< 768px): single column layout */

/* Tablet breakpoint (768px): two-column grid */
@media (min-width: 768px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  .container {
    padding: 0 var(--spacing-lg);
  }

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

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

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

/* Desktop breakpoint (1024px): three-column grid */
@media (min-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
  }

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

  /* Ensure text remains readable at all sizes */
  body {
    font-size: var(--font-size-body);
  }

  .hero p {
    font-size: 1.25rem;
  }
}

/* ============================================
   JavaScript Enhancement Animations
   ============================================ */

/* Card animation on scroll (progressive enhancement) */
.tool-card.card-animate {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.tool-card.card-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger animation for multiple cards */
.tool-card.card-animate:nth-child(1) {
  transition-delay: 0.1s;
}

.tool-card.card-animate:nth-child(2) {
  transition-delay: 0.2s;
}

.tool-card.card-animate:nth-child(3) {
  transition-delay: 0.3s;
}

.tool-card.card-animate:nth-child(4) {
  transition-delay: 0.4s;
}

.tool-card.card-animate:nth-child(5) {
  transition-delay: 0.5s;
}

/* Enhanced focus styles for keyboard navigation */
.focus-visible {
  outline: 3px solid var(--color-accent) !important;
  outline-offset: 2px !important;
}

/* Smooth scroll behavior (can be overridden by user preferences) */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .tool-card.card-animate {
    opacity: 1;
    transform: none;
  }
}

/* ============================================
   Product Detail Page Styles
   ============================================ */

/* Hero section for product pages */
.product-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e40af 100%);
  color: white;
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.product-hero h1 {
  color: white;
  margin-bottom: var(--spacing-md);
  font-size: clamp(2rem, 6vw, 3rem);
}

.product-hero .subtitle {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.95);
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
  line-height: 1.6;
}

.product-hero .cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: 8px;
  font-weight: 600;
  font-size: 1.125rem;
  transition: var(--transition-base);
  min-height: 48px;
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: #059669;
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(16, 185, 129, 0.3);
}

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

.btn-secondary:hover {
  background-color: var(--color-surface);
  transform: translateY(-2px);
}

/* Features section */
.features-section {
  padding: var(--spacing-2xl) 0;
  background-color: var(--color-surface);
}

.features-section h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.feature-card {
  background: white;
  border-radius: var(--card-border-radius);
  box-shadow: var(--card-shadow);
  padding: var(--card-padding);
  transition: var(--transition-base);
}

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

.feature-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  font-size: 2rem;
}

.feature-card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.feature-card p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.feature-card ul {
  margin-top: var(--spacing-sm);
  padding-left: var(--spacing-md);
  list-style: disc;
}

.feature-card li {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

/* Use cases section */
.use-cases-section {
  padding: var(--spacing-2xl) 0;
}

.use-cases-section h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text-primary);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.use-case-card {
  background: white;
  border-left: 4px solid var(--color-primary);
  padding: var(--spacing-lg);
  border-radius: 8px;
  box-shadow: var(--card-shadow);
}

.use-case-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.use-case-card p {
  color: var(--color-text-secondary);
}

/* CTA section */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e40af 100%);
  color: white;
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.cta-section h2 {
  color: white;
  margin-bottom: var(--spacing-md);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: white;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  transition: var(--transition-base);
}

.back-link:hover {
  transform: translateX(-4px);
}

/* Responsive adjustments for product pages */
@media (min-width: 768px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .use-cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ============================================
   Screenshots Gallery Section
   ============================================ */

.screenshots-section {
  padding: var(--spacing-2xl) 0;
  background-color: white;
}

.screenshots-section h2 {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text-primary);
}

.screenshots-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-xl);
}

.screenshot-item {
  background: var(--color-surface);
  border-radius: var(--card-border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--card-shadow);
  transition: var(--transition-base);
}

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

.screenshot-item img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin-bottom: var(--spacing-md);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.screenshot-item h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.screenshot-item p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

@media (min-width: 768px) {
  .screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .screenshots-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================
   Lightbox Modal for Images
   ============================================ */

.lightbox {
  display: none;
  position: fixed;
  z-index: 9999;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  cursor: pointer;
  animation: fadeIn 0.3s ease;
}

.lightbox.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-content {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
  animation: zoomIn 0.3s ease;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 40px;
  color: white;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  transition: var(--transition-base);
}

.lightbox-close:hover {
  color: var(--color-accent);
}

.screenshot-item img {
  cursor: pointer;
  transition: var(--transition-base);
}

.screenshot-item img:hover {
  opacity: 0.9;
  transform: scale(1.02);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes zoomIn {
  from {
    transform: scale(0.8);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}