/* Blog Stylesheet for md2html-action */
/* Personal blog and article styling */

/* ─── Theme Variables ─────────────────────────────────────────────────── */
:root {
  /* Light theme */
  --body_background_color: #fff;
  --content_background_color: #ffffff;
  --header_background_color: #2c3e50;
  --sidebar_background_color: #f8f9fa;

  --text_color: #2c3e50;
  --heading_color: #2c3e50;
  --subheading_color: #5a6c7d;
  --link_color: #e74c3c;
  --link_hover_color: #c0392b;
  --border_color: #ecf0f1;
  --accent_color: #3498db;

  --toc_background_color: #f8f9fa;
  --toc_border_color: #dee2e6;
  --toc_link_color: #6c757d;
  --toc_link_hover_color: #e74c3c;

  --code_bg_color: #f8f9fa;
  --code_text_color: #495057;
  --inline_code_bg_color: #f1f3f4;
  --quote_color: #6c757d;

  /* Typography */
  --main_font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --heading_font: "Playfair Display", Georgia, serif;
  --mono_font: "JetBrains Mono", "Fira Code", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --body_background_color: #1a1a1a;
    --content_background_color: #2d2d2d;
    --header_background_color: #343a40;
    --sidebar_background_color: #3d4349;

    --text_color: #e8e9ea;
    --heading_color: #ffffff;
    --subheading_color: #adb5bd;
    --link_color: #fd79a8;
    --link_hover_color: #e84393;
    --border_color: #495057;
    --accent_color: #74b9ff;

    --toc_background_color: #3d4349;
    --toc_border_color: #495057;
    --toc_link_color: #adb5bd;
    --toc_link_hover_color: #fd79a8;

    --code_bg_color: #212529;
    --code_text_color: #f8f9fa;
    --inline_code_bg_color: #343a40;
    --quote_color: #adb5bd;
  }
}

/* ─── Google Fonts Import ──────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─── Base Styles ─────────────────────────────────────────────────────── */
html {
  height: 100%;
  scroll-padding-top: 100px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--main_font);
  font-size: 18px;
  line-height: 1.7;
  color: var(--text_color);
  background-color: var(--body_background_color);
  min-width: 320px;
  font-weight: 400;
}

/* ─── Layout ─────────────────────────────────────────────────────────── */
.main-content {
  margin: 0 auto;
  max-width: 800px;
  background-color: var(--content_background_color);
  padding: 60px 60px 80px 60px;
  padding-top: 140px;
  min-height: calc(100vh - 140px - 80px);
  box-shadow: 0 0 50px rgba(0,0,0,0.1);
  position: relative;
}

.page-content {
  clear: both;
  margin-top: 40px;
}

/* ─── Header ────────────────────────────────────────────────────────── */
header,
.site-header {
  background: linear-gradient(135deg, var(--header_background_color) 0%, #34495e 100%);
  color: white;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 2px 20px rgba(0,0,0,0.15);
}

.header-content {
  margin: 0 auto;
  padding: 20px 60px;
  max-width: 800px;
  text-align: center;
}

.site-title h1 {
  margin: 0;
  font-family: var(--heading_font);
  font-weight: 700;
  font-size: 32px;
  color: white;
  letter-spacing: -0.5px;
}

.site-title h1 a {
  text-decoration: none;
  color: white;
  transition: opacity 0.2s ease;
}

.site-title h1 a:hover {
  opacity: 0.8;
}

.site-nav {
  margin-top: 15px;
}

.site-nav .nav-link {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  margin: 0 20px;
  padding: 8px 16px;
  border-radius: 20px;
  transition: all 0.2s ease;
  font-weight: 500;
  font-size: 16px;
}

.site-nav .nav-link:hover,
.site-nav .nav-link.active {
  background-color: rgba(255,255,255,0.1);
  color: white;
}

/* ─── Typography ──────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--heading_font);
  font-weight: 600;
  color: var(--heading_color);
  margin-top: 2.5em;
  margin-bottom: 0.8em;
  line-height: 1.3;
  clear: both;
}

h1 { 
  font-size: 2.8em; 
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 0.5em;
  line-height: 1.2;
}

h2 { 
  font-size: 2.2em; 
  margin-top: 1.8em;
  position: relative;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent_color), var(--link_color));
  border-radius: 2px;
}

h3 { 
  font-size: 1.8em; 
  color: var(--subheading_color);
}

h4 { 
  font-size: 1.4em; 
  font-style: italic;
}

h5, h6 { 
  font-size: 1.2em; 
  font-weight: 500;
}

p {
  margin-bottom: 1.4em;
  line-height: 1.8;
}

/* Article meta */
.article-meta {
  margin: 2em 0;
  padding: 20px 0;
  border-top: 1px solid var(--border_color);
  border-bottom: 1px solid var(--border_color);
  font-size: 16px;
  color: var(--subheading_color);
  text-align: center;
}

.article-date {
  font-style: italic;
}

.article-author {
  font-weight: 500;
  margin-left: 10px;
}

/* ─── Table of Contents ────────────────────────────────────────────────── */
.table-of-contents {
  background-color: var(--toc_background_color);
  border: 1px solid var(--toc_border_color);
  border-radius: 12px;
  margin: 40px 0;
  padding: 30px;
  font-size: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.table-of-contents h2 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 20px 0;
  text-align: center;
  color: var(--heading_color);
  font-family: var(--main_font);
}

.table-of-contents h2::after {
  display: none;
}

.table-of-contents ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.table-of-contents ul ul {
  padding-left: 20px;
  margin-top: 8px;
}

.table-of-contents li {
  margin-bottom: 8px;
}

.table-of-contents a {
  color: var(--toc_link_color);
  text-decoration: none;
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  transition: all 0.2s ease;
  line-height: 1.4;
  font-weight: 400;
}

.table-of-contents a:hover {
  background-color: var(--link_color);
  color: white;
  transform: translateX(4px);
}

/* ─── Links ──────────────────────────────────────────────────────────── */
a {
  color: var(--link_color);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ─── Lists ──────────────────────────────────────────────────────────── */
ul, ol {
  margin-bottom: 1.4em;
  padding-left: 2em;
}

li {
  margin-bottom: 0.6em;
  line-height: 1.7;
}

/* ─── Code ─────────────────────────────────────────────────────────────── */
code, pre, kbd, samp {
  font-family: var(--mono_font);
}

pre {
  background-color: var(--code_bg_color);
  color: var(--code_text_color);
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border_color);
  overflow-x: auto;
  line-height: 1.5;
  margin: 2em 0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

code {
  background-color: var(--inline_code_bg_color);
  color: var(--code_text_color);
  padding: 3px 6px;
  border-radius: 6px;
  font-size: 0.9em;
  font-weight: 500;
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-weight: 400;
}

/* ─── Blockquotes ──────────────────────────────────────────────────────── */
blockquote {
  margin: 2.5em 0;
  padding: 1.5em 2em;
  background: linear-gradient(135deg, var(--sidebar_background_color) 0%, rgba(52, 152, 219, 0.05) 100%);
  border-left: 4px solid var(--accent_color);
  border-radius: 0 12px 12px 0;
  font-style: italic;
  font-size: 1.1em;
  color: var(--quote_color);
  position: relative;
}

blockquote p {
  margin: 0;
}

blockquote::before {
  content: '\201C';
  font-size: 4em;
  color: var(--accent_color);
  position: absolute;
  left: 0.2em;
  top: 0.1em;
  font-family: var(--heading_font);
  opacity: 0.3;
}

/* ─── Tables ──────────────────────────────────────────────────────────── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 2em 0;
  font-size: 16px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

th, td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border_color);
}

th {
  background: linear-gradient(135deg, var(--sidebar_background_color) 0%, var(--border_color) 100%);
  font-weight: 600;
  color: var(--heading_color);
  font-family: var(--main_font);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover {
  background-color: rgba(52, 152, 219, 0.02);
}

/* ─── Images ──────────────────────────────────────────────────────────── */
img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

figure {
  margin: 3em 0;
  text-align: center;
}

figcaption {
  font-size: 16px;
  color: var(--subheading_color);
  font-style: italic;
  margin-top: 1em;
  line-height: 1.5;
}

/* ─── Special Elements ─────────────────────────────────────────────────── */
.highlight {
  background: linear-gradient(120deg, rgba(255,255,0,0.3) 0%, rgba(255,255,0,0.1) 100%);
  padding: 2px 4px;
  border-radius: 4px;
}

.dropcap {
  float: left;
  font-family: var(--heading_font);
  font-size: 4em;
  line-height: 0.8;
  padding-right: 8px;
  padding-top: 4px;
  color: var(--accent_color);
}

/* ─── Footer ──────────────────────────────────────────────────────────── */
footer,
.site-footer {
  background: linear-gradient(135deg, var(--sidebar_background_color) 0%, var(--border_color) 100%);
  padding: 40px 0;
  margin-top: 60px;
  font-size: 16px;
  color: var(--subheading_color);
  text-align: center;
}

.footer-content {
  margin: 0 auto;
  max-width: 800px;
  padding: 0 60px;
}

/* ─── Responsive Design ────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .main-content {
    padding: 120px 40px 60px 40px;
    box-shadow: none;
  }
  
  .header-content,
  .footer-content {
    padding: 20px 40px;
  }
  
  .site-nav .nav-link {
    margin: 0 10px;
    font-size: 14px;
  }
  
  body {
    font-size: 16px;
  }
  
  h1 { font-size: 2.2em; }
  h2 { font-size: 1.8em; }
  h3 { font-size: 1.5em; }
  
  .table-of-contents {
    padding: 20px;
    margin: 30px 0;
  }
  
  .dropcap {
    font-size: 3em;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 100px 20px 40px 20px;
  }
  
  .header-content,
  .footer-content {
    padding: 15px 20px;
  }
  
  .site-title h1 {
    font-size: 24px;
  }
  
  .table-of-contents {
    padding: 16px;
    margin: 20px 0;
  }
  
  blockquote {
    padding: 1em 1.5em;
    margin: 2em 0;
  }
}