/* Blog Common Styles - Unified Design System */

/* CSS Custom Properties for Theming */
:root {
  /* Dark Theme Colors (default) */
  --bg-primary: #000000;
  --text-primary: #ffffff;
  --text-secondary: #e6e6e6;
  --text-muted: rgba(255, 255, 255, 0.7);
  --text-footer: rgba(255, 255, 255, 0.6);
  --link-color: #4db1ff;
  --link-hover: #3399ff;
  --border-color: rgba(255, 255, 255, 0.1);
  --border-light: rgba(255, 255, 255, 0.05);
  
  /* Component Colors - Minimal */
  --code-bg: rgba(255, 255, 255, 0.05);
  --pre-bg: rgba(0, 0, 0, 0.2);
  --blockquote-bg: rgba(0, 0, 0, 0.3);
  --table-header-bg: rgba(255, 255, 255, 0.05);
  
  /* Minimal Effects - Linear.app inspired */
  --glass-bg: rgba(0, 0, 0, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-hover: rgba(255, 255, 255, 0.02);
  --glass-active: rgba(255, 255, 255, 0.03);
  
  /* Navigation */
  --nav-bg: transparent;
  --nav-bg-hover: rgba(255, 255, 255, 0.05);
  --nav-border: rgba(255, 255, 255, 0.1);
  
  /* Theme Toggle */
  
  /* Spacing - Fluid Responsive System */
  --spacing-xs: clamp(0.25rem, 0.25rem + 0.1vw, 0.375rem);
  --spacing-sm: clamp(0.5rem, 0.5rem + 0.15vw, 0.75rem);
  --spacing-md: clamp(1rem, 1rem + 0.25vw, 1.25rem);
  --spacing-lg: clamp(1.5rem, 1.5rem + 0.5vw, 2rem);
  --spacing-xl: clamp(2rem, 2rem + 0.75vw, 3rem);
  --spacing-2xl: clamp(3rem, 3rem + 1vw, 4rem);
  
  /* Typography - Inter Variable Font */
  --font-sans: 'Inter Variable', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  
  /* Fluid font sizes using clamp() */
  --font-size-base: clamp(16px, 1rem + 0.25vw, 18px);
  --font-size-sm: clamp(14px, 0.875rem + 0.1vw, 16px);
  --font-size-lg: clamp(18px, 1.125rem + 0.3vw, 20px);
  --font-size-xl: clamp(20px, 1.25rem + 0.5vw, 24px);
  
  /* Fluid heading sizes - Linear.app inspired scale */
  --font-size-h1: clamp(32px, 2.5rem + 1.5vw, 42px);
  --font-size-h2: clamp(26px, 2rem + 1vw, 32px);
  --font-size-h3: clamp(22px, 1.5rem + 0.75vw, 26px);
  --font-size-h4: clamp(18px, 1.25rem + 0.5vw, 22px);
  --font-size-h5: clamp(16px, 1.125rem + 0.25vw, 18px);
  --font-size-h6: clamp(14px, 1rem + 0.1vw, 16px);
  
  /* Line heights - Linear.app inspired */
  --line-height-base: 1.6;
  --line-height-heading: 1.25;
  --line-height-tight: 1.15;
  --line-height-loose: 1.7;
  
  /* Animation */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease-in-out;
  --transition-bg: 0.8s ease-in-out;
  
  /* Layout */
  --container-max: 1000px;
  --border-radius: 4px;
  --border-radius-lg: 8px;
  
  /* Minimal Shadows - Linear.app style */
  --shadow-sm: none;
  --shadow-md: none;
  --shadow-lg: none;
  --shadow-xl: none;
}



/* Base Reset & Core Layout */
body {
  background-color: var(--bg-primary);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: var(--container-max);
  width: 100%;
  margin: 0;
  padding: 0;
  background-color: transparent;
  position: relative;
  z-index: 1;
}

/* Markdown Content Styling */
.markdown-body {
  box-sizing: border-box;
  min-width: 200px;
  max-width: 100%;
  color: var(--text-primary);
  background-color: transparent;
  padding: calc(var(--spacing-2xl) + 20px) var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
}

/* Headings */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
  line-height: var(--line-height-heading);
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.markdown-body h1:first-child,
.markdown-body h2:first-child,
.markdown-body h3:first-child {
  margin-top: 0;
}

.markdown-body h1,
.markdown-body h2 {
  border-bottom: 0.5px solid rgba(255, 255, 255, 0.08);
  padding-bottom: var(--spacing-sm);
  text-shadow: none;
}

.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: rgba(255, 255, 255, 0.92);
}

.markdown-body h1 { font-size: var(--font-size-h1); }
.markdown-body h2 { font-size: var(--font-size-h2); }
.markdown-body h3 { font-size: var(--font-size-h3); }
.markdown-body h4 { font-size: var(--font-size-h4); }
.markdown-body h5 { font-size: var(--font-size-h5); }
.markdown-body h6 { font-size: var(--font-size-h6); }

/* Paragraphs */
.markdown-body p {
  margin-bottom: var(--spacing-lg);
  color: rgba(255, 255, 255, 0.88);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
}

/* First paragraph styling (usually date/author) - disabled for now */
/* .markdown-body > p:first-of-type {
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: var(--spacing-xl);
  font-size: var(--font-size-sm);
} */

/* Links - Linear.app style */
.markdown-body a {
  color: var(--link-color);
  font-weight: 400;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  padding-bottom: 1px;
}

.markdown-body a:hover {
  color: var(--link-hover);
  border-bottom-color: rgba(77, 177, 255, 0.3);
}

/* Lists - Improved spacing */
.markdown-body ul,
.markdown-body ol {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-xl);
  color: rgba(255, 255, 255, 0.86);
}

.markdown-body li {
  margin-bottom: var(--spacing-sm);
  line-height: var(--line-height-base);
}

.markdown-body li > p {
  margin-bottom: var(--spacing-sm);
}

/* Code - Inline */
.markdown-body code {
  background-color: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

/* Code - Blocks */
.markdown-body pre {
  background-color: var(--pre-bg) !important;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
  border: 0.5px solid var(--border-light);
}

.markdown-body pre code {
  background-color: transparent;
  padding: 0;
  border-radius: 0;
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

/* Blockquotes */
.markdown-body blockquote {
  background-color: var(--blockquote-bg);
  border-left: 4px solid var(--link-color);
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md) calc(var(--spacing-md) * 1.2);
  border-radius: var(--border-radius);
  color: rgba(255, 255, 255, 0.9);
}

.markdown-body blockquote > :last-child {
  margin-bottom: 0;
}

/* Tables */
.markdown-body table {
  border-collapse: collapse;
  margin: calc(var(--spacing-md) * 1.5) 0;
  width: 100%;
  overflow-x: auto;
  display: block;
}

.markdown-body table th,
.markdown-body table td {
  padding: calc(var(--spacing-md) * 0.75) var(--spacing-md);
  border: 0.5px solid var(--border-color);
  text-align: left;
}

.markdown-body table th {
  background-color: var(--table-header-bg);
  font-weight: 500;
  color: var(--text-primary);
}

.markdown-body table td {
  color: var(--text-secondary);
}

.markdown-body table tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Horizontal Rules */
.markdown-body hr {
  height: 0;
  margin: var(--spacing-xl) 0;
  overflow: hidden;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--border-color);
}

/* Images */
.markdown-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

/* Navigation Link */
.home-link {
  position: fixed;
  top: 20px;
  left: 20px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
  z-index: 100;
  text-decoration: none;
  background-color: transparent;
  padding: 8px 16px;
  border-radius: 6px;
  font-weight: 400;
  transition: all 0.2s ease;
  border: 0.5px solid rgba(255, 255, 255, 0.1);
}

/* Breadcrumb Navigation */
.breadcrumb {
  position: fixed;
  top: 15px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 99;
  background: rgba(0, 0, 0, 0.8);
  border: 0.5px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xs) var(--spacing-sm);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--font-size-sm);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  margin: 0 var(--spacing-xs);
  color: var(--text-muted);
}

.breadcrumb-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--text-primary);
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 400;
}

@media (max-width: 767px) {
  .breadcrumb {
    display: none;
  }
}


.home-link:hover {
  background-color: rgba(255, 255, 255, 0.02);
  color: rgba(255, 255, 255, 0.95);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Post Navigation */
.post-navigation {
  margin: var(--spacing-2xl) 0;
  padding: var(--spacing-lg) 0;
  border-top: 0.5px solid var(--border-color);
}

.post-nav-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  max-width: 100%;
}

.post-nav-link {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  background-color: rgba(255, 255, 255, 0.02);
  border: 0.5px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  text-decoration: none;
  transition: all var(--transition-fast);
  min-height: 80px;
}

.post-nav-link:hover {
  background-color: rgba(255, 255, 255, 0.02);
  border-color: rgba(255, 255, 255, 0.15);
}

.post-nav-link.prev {
  text-align: left;
}

.post-nav-link.next {
  text-align: right;
}

.post-nav-label {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
  font-weight: 400;
}

.post-nav-title {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  line-height: var(--line-height-tight);
  font-weight: 400;
}

@media (max-width: 767px) {
  .post-nav-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .post-nav-link.next {
    text-align: left;
  }
  
  .post-nav-title {
    font-size: var(--font-size-sm);
  }
}

/* Footer */
.footer {
  text-align: center;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--text-footer);
  font-size: 14px;
  padding: var(--spacing-sm);
  border-top: 0.5px solid var(--border-color);
}

/* Background */
#bg {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
  /* Fallback background to prevent completely black page */
  background-color: #1a1a1a;
  /* Default background image for immediate display */
  background-image: url('../jpg/bg-night.webp');
  transition: opacity var(--transition-bg);
  filter: brightness(0.45) contrast(1.05);
  opacity: 1;
}

#bg.loaded {
  opacity: 1;
}

#bg.loading {
  opacity: 0.7;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-lg); }

/* Custom Components */

/* Footnotes (for blog posts that use them) */
.footnotes {
  margin-top: var(--spacing-2xl);
  padding-top: var(--spacing-lg);
  border-top: 0.5px solid var(--border-color);
  font-size: var(--font-size-sm);
}

.footnotes ol {
  padding-left: var(--spacing-lg);
}

/* Responsive Design */
@media (max-width: 767px) {
  .container {
    width: 100%;
  }
  
  .markdown-body {
    padding: calc(var(--spacing-2xl) + 10px) var(--spacing-md) var(--spacing-lg) var(--spacing-md);
  }
  
  .home-link {
    top: 10px;
    left: 10px;
    font-size: 14px;
    padding: 6px 12px;
  }
  
  .markdown-body table {
    font-size: var(--font-size-sm);
  }
  
  .markdown-body pre {
    padding: var(--spacing-sm);
  }
  
  /* Mobile background switcher: see bg-switcher.css */

  .bg-switcher-tooltip {
    right: 60px;
    bottom: 20px;
    font-size: 12px;
  }
}

/* Tablet Breakpoint */
@media (min-width: 768px) and (max-width: 1024px) {
  .container {
    max-width: 90%;
  }
  
  .markdown-body {
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
  }
}

/* Text Selection with Animation */
::selection {
  background-color: var(--link-color);
  color: var(--bg-primary);
  text-shadow: none;
}

::-moz-selection {
  background-color: var(--link-color);
  color: var(--bg-primary);
  text-shadow: none;
}

/* Enhanced text selection for different elements */
.markdown-body h1::selection,
.markdown-body h2::selection,
.markdown-body h3::selection {
  background-color: rgba(77, 177, 255, 0.8);
  color: #000;
}

.markdown-body code::selection {
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
}

.markdown-body blockquote::selection {
  background-color: rgba(77, 177, 255, 0.6);
  color: var(--bg-primary);
}

/* Floating Table of Contents */
.table-of-contents {
  position: fixed;
  bottom: 20px;
  left: 20px;
  background: rgba(0, 0, 0, 0.85);
  border: 0.5px solid var(--border-light);
  border-radius: var(--border-radius-lg);
  max-width: 280px;
  height: auto;
  max-height: calc(100vh - 120px);
  overflow: hidden;
  z-index: 100;
  transition: all var(--transition-fast);
}

.table-of-contents.collapsed {
  max-height: 45px;
}

.toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 0.5px solid var(--border-light);
  background: rgba(255, 255, 255, 0.02);
}

.toc-title {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.toc-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all var(--transition-fast);
  font-size: 16px;
  line-height: 1;
}

.toc-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.toc-list {
  list-style: none;
  padding: var(--spacing-sm) 0;
  margin: 0;
  height: auto;
  max-height: calc(100vh - 200px);
  overflow-y: auto;
  overflow-x: hidden;
}

.toc-list::-webkit-scrollbar {
  width: 4px;
}

.toc-list::-webkit-scrollbar-track {
  background: transparent;
}

.toc-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 2px;
}

.toc-list::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}

.toc-item {
  margin: 0;
}

.toc-link {
  display: block;
  padding: 4px var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all var(--transition-fast);
  line-height: 1.4;
}

.toc-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.toc-link.active {
  color: var(--link-color);
  border-left-color: var(--link-color);
  background: rgba(77, 177, 255, 0.1);
}

.toc-h2 .toc-link {
  padding-left: calc(var(--spacing-md) + 12px);
}

.toc-h3 .toc-link {
  padding-left: calc(var(--spacing-md) + 24px);
  font-size: 13px;
}

@media (max-width: 1200px) {
  .table-of-contents {
    max-width: 250px;
    bottom: 15px;
    left: 15px;
  }
}

@media (max-width: 767px) {
  .table-of-contents {
    display: none;
  }
}

/* Focus States for Accessibility */
a:focus,
button:focus,
[tabindex]:focus {
  outline: 2px solid var(--link-color);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .home-link,
  #change,
  .footer {
    display: none;
  }
  
  .markdown-body {
    padding: 0;
    max-width: 100%;
  }
  
  .markdown-body a {
    color: #0366d6;
  }
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}

/* View Transitions API */
@view-transition {
  navigation: auto;
}

::view-transition-old(root) {
  animation: slide-out 0.3s ease-in-out;
}

::view-transition-new(root) {
  animation: slide-in 0.3s ease-in-out;
}

@keyframes slide-out {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(-20px);
  }
}

@keyframes slide-in {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Loading Skeleton */
.skeleton-loader {
  animation: skeleton-loading 1.2s ease-in-out infinite;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.05) 25%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0.05) 75%
  );
  background-size: 200% 100%;
  border-radius: var(--border-radius);
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Skeleton Elements */
.skeleton-title {
  height: var(--font-size-h1);
  width: 80%;
  margin-bottom: var(--spacing-lg);
  background-color: rgba(255, 255, 255, 0.08);
}

.skeleton-meta {
  height: var(--font-size-base);
  width: 200px;
  margin-bottom: var(--spacing-xl);
  background-color: rgba(255, 255, 255, 0.06);
}

.skeleton-paragraph {
  height: var(--font-size-base);
  margin-bottom: var(--spacing-sm);
  background-color: rgba(255, 255, 255, 0.05);
}

.skeleton-paragraph:nth-child(odd) {
  width: 100%;
}

.skeleton-paragraph:nth-child(even) {
  width: 85%;
}

.skeleton-paragraph:last-child {
  width: 60%;
}

/* Content Loading States */
.markdown-body.loading {
  opacity: 0;
  transition: opacity var(--transition-base);
}

.markdown-body.loaded {
  opacity: 1;
  animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 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;
  }
}