/* 
 * Swiss Design Theme for BSSG
 * Based on International Typographic Style with focus on grids,
 * clean sans-serif typography, and strong visual hierarchy
 * 
 * IMPROVEMENTS APPLIED:
 * - Added comprehensive reduced motion support
 * - Enhanced accessibility with focus outlines
 * - Added text browser fallbacks
 * - Optimized performance while maintaining Swiss design principles
 *
 * FURTHER CUSTOMIZATION BY: Markus Walther
 */

:root {
  /* Swiss design color scheme */
  --white: #ffffff;
  --black: #000000;
  --light-gray: #f2f2f2;
  --medium-gray: #dddddd;
  --dark-gray: #555555;
  --red: #dc0018;
  --blue: #2196f3;
  --yellow: #ffeb3b;

  /* Semantic color assignments */
  --bg-color: #fefefe;
  --text-color: var(--black);
  --heading-color: var(--black);
  --link-color: var(--red);
  --link-hover: var(--dark-gray);
  --border-color: var(--medium-gray);

  /* Typography - ENHANCED fallbacks for text browsers */
  --font-main: 'Helvetica Neue', Helvetica, -apple-system, BlinkMacSystemFont,
    'Segoe UI', Arial, sans-serif;
  --font-headings: 'Helvetica Neue', Helvetica, -apple-system,
    BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  --font-mono: 'Courier New', 'Courier', monospace;

  /* Sizing */
  --content-width: 90%;
  --max-content-width: 1200px;
  --grid-column-gap: 30px;
  --grid-row-gap: 60px;

  /* Spacing */
  --spacing-xs: 5px;
  --spacing-sm: 10px;
  --spacing-md: 20px;
  --spacing-lg: 40px;
  --spacing-xl: 60px;

  /* Typographic scale */
  --text-xs: 0.8rem;
  --text-sm: 0.9rem;
  --text-md: 1rem;
  --text-lg: 1.1rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 2.5rem;
  --text-4xl: 3rem;
  --text-5xl: 3.5rem;

  /* Line heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.6;

  /* Transitions - OPTIMIZED for performance */
  --transition-fast: 0.15s;
  --transition-base: 0.2s;
}

/* REDUCED MOTION SUPPORT - Disable animations for users who prefer reduced motion */
@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;
    transform: none !important;
  }
}

/* Reset and base elements */
html {
  font-size: 16px;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 0;
  line-height: var(--line-height-normal);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  width: 100%;
  overflow-x: hidden;
}

body > *:not(:first-child):not(:last-child) {
  margin-left: var(--spacing-lg);
}

.container {
  width: var(--content-width);
  max-width: var(--max-content-width);
  margin: var(--spacing-lg) auto;
  padding: 0;
  background-color: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

/* Header with Swiss precision */
header {
  padding: var(--spacing-lg) 0 0;
  position: relative;
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

/* Site title - stark and bold */
.site-title {
  font-family: var(--font-headings);
  font-weight: 700;
  font-size: var(--text-3xl);
  text-transform: uppercase;
  letter-spacing: -1px;
  margin: 0;
  padding: 0;
  line-height: 1;
}

.site-title a {
  color: var(--heading-color);
  text-decoration: none;
  transition: color var(--transition-base) ease;
  /* ACCESSIBILITY: Focus outline */
  outline: none;
}

.site-title a:hover {
  color: var(--red);
}

/* ACCESSIBILITY: Focus states for site title */
.site-title a:focus {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* Site description - minimalist */
header p {
  margin: var(--spacing-xs) 0 0;
  font-size: var(--text-md);
  font-weight: 300;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

/* Navigation - clean horizontal bar */
nav {
  display: flex;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md) 0;
  justify-content: center;
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  padding: 0 var(--spacing-md) 0 0;
  margin-right: var(--spacing-md);
  font-size: var(--text-sm);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  position: relative;
  transition: color var(--transition-base) ease;
  /* ACCESSIBILITY: Focus outline */
  outline: none;
}

nav a[title='Home'] {
  color: #777;
  margin-top: -3px;
}

nav a:hover,
nav a.active {
  color: var(--red);
}

/* ACCESSIBILITY: Focus states for navigation */
nav a:focus {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* Content area with grid structure */
main {
  padding: 0 var(--spacing-md) var(--spacing-xl);
  min-height: 60vh;
}

/* Clear typography with strong hierarchy */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-headings);
  color: var(--heading-color);
  margin: var(--spacing-lg) 0 var(--spacing-md);
  line-height: var(--line-height-tight);
  font-weight: 700;
}

h1 {
  font-size: var(--text-4xl);
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  letter-spacing: -1px;
  color: var(--red);
}

h2 {
  font-size: var(--text-2xl);
  letter-spacing: -0.5px;
}

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

p {
  margin-bottom: var(--spacing-md);
  font-size: var(--text-lg);
  line-height: var(--line-height-relaxed);
  width: inherit;
}

/* Black links with red hover - classic Swiss style */
a {
  color: var(--link-color);
  text-decoration: none;
  transition: all var(--transition-fast) ease;
  border-bottom: 1px solid transparent;
  /* ACCESSIBILITY: Focus outline */
  outline: none;
}

a:visited {
  color: var(--dark-gray);
}

a:hover {
  color: var(--link-hover);
  border-bottom: 1px solid var(--link-hover);
}

/* ACCESSIBILITY: Focus states for general links */
a:focus {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* Swiss-style articles with strong structure */
article {
  display: inline-block;
  margin-bottom: var(--grid-row-gap);
  position: relative;
}

article:last-child {
  margin-bottom: 0;
}

article h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--spacing-sm);
}

article .meta {
  font-size: var(--text-sm);
  margin-bottom: var(--spacing-lg);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  color: var(--dark-gray);
  border-bottom: 1px solid var(--medium-gray);
  width: inherit;
}

article,
.page-meta,
.container,
.featured-image {
  width: 92%;
}

pre {
  white-space: pre-wrap; /* fold preformatted content if width is too narrow */
}

code {
  word-break: break-word; /* fold preformatted content if width is too narrow */
}

/* Reading time - minimal style with TEXT BROWSER FALLBACK */
.reading-time.reading-time {
  position: relative;
  border-bottom: none;
}

/* TEXT BROWSER FALLBACK: Add "Time: " prefix for reading time */
.reading-time::before {
  content: 'Time: ';
}

/* Hide the prefix when CSS transforms are supported (modern browsers) */
@supports (transform: translateX(0)) {
  .reading-time::before {
    content: '⏱ ';
  }
}

/* Tags with Swiss precision */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tags a {
  background-color: var(--light-gray);
  color: var(--text-color);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
  border: none;
  transition: all var(--transition-fast) ease;
  /* ACCESSIBILITY: Focus outline */
  outline: none;
}

.tags a:hover {
  background-color: var(--black);
  color: var(--white);
  border: none;
}

/* ACCESSIBILITY: Focus states for tags */
.tags a:focus {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* Tags list page - strong grid */
.tags-list {
  list-style-type: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.tags-list li {
  margin: 0;
}

.tags-list a {
  display: block;
  background-color: var(--light-gray);
  color: var(--text-color);
  padding: var(--spacing-md);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
  text-decoration: none;
  border: none;
  transition: all var(--transition-fast) ease;
  text-align: center;
  /* ACCESSIBILITY: Focus outline */
  outline: none;
}

.tags-list a:hover {
  background-color: var(--black);
  color: var(--white);
  border: none;
}

/* ACCESSIBILITY: Focus states for tags list */
.tags-list a:focus {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* Footer - clean and minimal */
footer {
  display: inline-block;
  background-color: var(--light-gray);
  color: var(--text-color);
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md);
  border-top: 0.5px solid var(--medium-gray);
  width: 100%;
}

footer p {
  margin: var(--spacing-xs) 0;
  font-size: var(--text-sm);
}

footer a {
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: all var(--transition-base) ease;
  /* ACCESSIBILITY: Focus outline */
  outline: none;
}

footer a:hover {
  border-bottom: 1px solid var(--link-hover);
  color: var(--link-hover);
}

/* ACCESSIBILITY: Focus states for footer links */
footer a:focus {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* Pagination - Swiss precision */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin: var(--spacing-xl) 0 0;
}

.pagination a {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--light-gray);
  color: var(--text-color);
  font-weight: 500;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: var(--text-xs);
  border: none;
  transition: all var(--transition-fast) ease;
  /* ACCESSIBILITY: Focus outline */
  outline: none;
}

.pagination a:hover {
  background-color: var(--black);
  color: var(--white);
  border: none;
}

/* ACCESSIBILITY: Focus states for pagination */
.pagination a:focus {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* Featured images - clean presentation */
.featured-image,
.index-image,
.tag-image,
.archive-image {
  margin-bottom: var(--spacing-lg);
  position: relative;
  text-align: center;
}

.featured-image img,
.index-image img,
.tag-image img,
.archive-image img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  width: inherit;
}

/* Post list with grid structure */
.posts-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-row-gap);
}

.posts-list article {
  margin-bottom: 0;
  border-bottom: 1px solid var(--medium-gray);
  padding-bottom: var(--grid-row-gap);
}

.posts-list article:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.posts-list h3 {
  margin-top: 0;
  font-size: var(--text-2xl);
  margin-bottom: var(--spacing-sm);
}

/* ACCESSIBILITY: Focus states for post list links */
.posts-list a:focus {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* Grid-based layout for larger screens */
@media (min-width: 768px) {
  .posts-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: var(--grid-column-gap) var(--grid-row-gap);
  }

  .posts-list article {
    border-bottom: none;
    padding-bottom: 0;
  }

  /* Two column article layout for featured/archive pages */
  article.with-image {
    grid-template-columns: 2fr 1fr;
    align-items: start;
  }

  article.with-image .content {
    grid-column: 1;
  }

  article.with-image .featured-image,
  article.with-image .index-image,
  article.with-image .tag-image,
  article.with-image .archive-image {
    grid-column: 2;
    margin-top: var(--spacing-lg);
  }
}

/* Enhanced typography for larger screens */
@media (min-width: 1200px) {
  html {
    font-size: 18px;
  }

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

  h1 {
    font-size: var(--text-5xl);
  }

  h2 {
    font-size: var(--text-3xl);
  }

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

/* Responsive adjustments for smaller screens */
@media (max-width: 767px) {
  header {
    padding: var(--spacing-md) 0 0;
    margin-bottom: var(--spacing-lg);
  }

  .site-title {
    font-size: var(--text-2xl);
  }

  nav {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm) 0;
  }

  nav a {
    padding: var(--spacing-xs) var(--spacing-sm) 0 0;
    margin-right: var(--spacing-sm);
    cursor: pointer;
  }

  main {
    padding-bottom: var(--spacing-lg);
  }

  h1 {
    font-size: var(--text-2xl);
  }

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

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

  .pagination {
    margin-top: var(--spacing-lg);
  }

  .container {
    margin: var(--spacing-sm) auto;
  }
}