/* ============================================
   biggerpicture.cc — wspólne style (ulepszone)
   ============================================ */

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

:root {
  /* Kolory */
  --color-primary: #0066cc;
  --color-primary-hover: #0052a3;
  --color-text: #1a1a1a;
  --color-text-secondary: #4a4a4a;
  --color-text-tertiary: #6b6b6b;
  --color-border: #e5e5e5;
  --color-bg: #ffffff;
  --color-bg-secondary: #f9f9f9;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.75rem;
  --font-size-2xl: 2rem;
  
  /* Transitions */
  --transition-base: 0.2s ease;
  
  /* Breakpoints */
  --breakpoint-md: 768px;
}

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

body {
  font-family: var(--font-family);
  margin: 0;
  padding: var(--spacing-md) var(--spacing-xl);
  max-width: 48rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* ============================================
   NAVIGATION (ulepszona)
   ============================================ */

nav {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

nav::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

nav:focus-within::after {
  width: 100%;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
}

nav li {
  margin: 0;
}

nav a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  transition: background-color var(--transition-base), color var(--transition-base);
  display: inline-block;
  position: relative;
}

nav a:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-primary-hover);
  text-decoration: none;
}

nav a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  background-color: var(--color-bg-secondary);
}

nav a[aria-current="page"] {
  font-weight: 600;
  color: var(--color-text);
  background-color: var(--color-bg-secondary);
  position: relative;
}

nav a[aria-current="page"]::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 70%;
  background: var(--color-primary);
  border-radius: 0 2px 2px 0;
}

/* Skip link dla accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  z-index: 1000;
  border-radius: 0 0 4px 0;
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   MAIN CONTENT
   ============================================ */

main {
  margin-top: 0;
}

h1 {
  margin-top: 0;
  font-size: var(--font-size-xl);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

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

.lead {
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

/* ============================================
   LINKS
   ============================================ */

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

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ============================================
   LISTS
   ============================================ */

ul, ol {
  padding-left: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

li {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

/* ============================================
   CODE
   ============================================ */

code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  font-size: 0.9em;
  padding: 0.15em 0.4em;
  background: var(--color-bg-secondary);
  border-radius: 4px;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

/* ============================================
   RESPONSIVE
   ============================================ */

/* Screen reader only class */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus visible improvements */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduced motion support */
@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;
  }
}

/* ============================================
   EXPERIMENT CARDS
   ============================================ */

.experiments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.experiment-card {
  padding: var(--spacing-lg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.experiment-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.experiment-card h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
}

.experiment-card h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.experiment-card h3 a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.experiment-status {
  margin-top: var(--spacing-md);
  margin-bottom: 0;
}

.status-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 12px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-in-progress {
  background-color: #fff3cd;
  color: #856404;
}

.status-concept {
  background-color: #d1ecf1;
  color: #0c5460;
}

.status-complete {
  background-color: #d4edda;
  color: #155724;
}

/* ============================================
   IMPROVED CONTENT STRUCTURE
   ============================================ */

section {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

section > h2:first-child {
  margin-top: 0;
}

article {
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   BREADCRUMBS
   ============================================ */

.breadcrumb {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
}

.breadcrumb ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs);
}

.breadcrumb li {
  margin: 0;
  display: flex;
  align-items: center;
  color: var(--color-text-tertiary);
}

.breadcrumb li:not(:last-child)::after {
  content: '/';
  margin: 0 var(--spacing-xs);
  color: var(--color-text-tertiary);
  font-weight: 400;
}

.breadcrumb a {
  color: var(--color-text-tertiary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

.breadcrumb a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

.breadcrumb li[aria-current="page"] {
  color: var(--color-text);
  font-weight: 500;
}

.breadcrumb li[aria-current="page"]::after {
  display: none;
}

/* ============================================
   SECTION NAVIGATION (Design System)
   ============================================ */

.section-nav {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-md);
  background: var(--color-bg-secondary);
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.section-nav__prev,
.section-nav__next {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.section-nav__prev:hover,
.section-nav__next:hover {
  background-color: var(--color-bg);
  color: var(--color-primary-hover);
  text-decoration: none;
}

.section-nav__prev:focus-visible,
.section-nav__next:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.section-nav__index {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.section-nav__index:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
  text-decoration: underline;
}

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

@media (max-width: 768px) {
  .section-nav {
    flex-direction: column;
    align-items: stretch;
  }
  
  .section-nav__prev,
  .section-nav__next,
  .section-nav__index {
    text-align: center;
  }
}

/* ============================================
   IMPROVED LISTS
   ============================================ */

ul.experiment-list,
ol.experiment-list {
  list-style: none;
  padding: 0;
}

ul.experiment-list li,
ol.experiment-list li {
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  border-left: 3px solid var(--color-border);
  background: var(--color-bg-secondary);
  border-radius: 4px;
}

ul.experiment-list li:hover,
ol.experiment-list li:hover {
  border-left-color: var(--color-primary);
  background: var(--color-bg);
}

@media (max-width: 768px) {
  body {
    padding: var(--spacing-md);
  }
  
  nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  nav a {
    width: 100%;
    padding: var(--spacing-sm);
  }
  
  h1 {
    font-size: var(--font-size-lg);
  }
  
  .experiments-grid {
    grid-template-columns: 1fr;
  }
}