/* 1. Imports & Variables */
:root {
  /* Spacing Scale */
  --space-2xs: 0.25em;
  --space-xs: 0.5em;
  --space-sm: 1em;
  --space-md: 1.5em;
  --space-lg: 2em;

  /* Border Properties */
  --radius-base: 3px;
  --border-base: 1px;

  /* Color Palette - Light mode (default) */
  --color-text-primary: #333;
  --color-background: #fff;
  --color-code-background: #f6f8fa;
  --color-code-inline: rgba(27, 31, 35, 0.05);
  --color-border-base: #eaecef;
  --color-border-quote: #dfe2e5;
  --color-text-quote: #6a737d;
  --color-border-table: #dfe2e5;
  --color-border-table-row: #c6cbd1;
  --color-background-table-alt: #f6f8fa;
  --color-border-hr: #e1e4e8;
  --color-link: #0366d6;
  --color-focus-ring: #0366d6;
  --color-hover-background: rgba(27, 31, 35, 0.05);
}

/* Dark mode color palette */
@media (prefers-color-scheme: dark) {
  :root {
    --color-text-primary: #e1e4e8;
    --color-background: #0d1117;
    --color-code-background: #161b22;
    --color-code-background-rgb: 22, 27, 34;
    --color-code-inline: rgba(110, 118, 129, 0.4);
    --color-border-base: #30363d;
    --color-border-quote: #30363d;
    --color-text-quote: #8b949e;
    --color-border-table: #30363d;
    --color-border-table-row: #21262d;
    --color-background-table-alt: #161b22;
    --color-border-hr: #21262d;
    --color-link: #58a6ff;
    --color-focus-ring: #58a6ff;
    --color-hover-background: rgba(110, 118, 129, 0.1);
  }
}

/* 2. Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  margin: 0;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: 'Open Sans', Helvetica, sans-serif;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-lg);
  overflow-wrap: break-word;
  height: 100vh; /* ensures it covers full screen */
}

@media (prefers-color-scheme: dark) {
  body {
    background: 
      radial-gradient(
        ellipse at top center,
        #002850 0%, 
        #000000 60%
      ) no-repeat,
      #000000;
    background-size: 100% 100%;
    background-attachment: fixed;
  }
}

/* 3. Typography */
/* Headings */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  font-weight: 300;
}

h1:first-of-type {
  margin-top: var(--space-xs);
}

h1 { font-size: 3.998rem; }
h2 { font-size: 2.827rem; }
h3 { font-size: 1.999rem; }
h4 { font-size: 1.414rem; }
h5 { font-size: 1.121rem; }
h6 { font-size: .88rem; }

/* Text Elements */
p, blockquote {
  margin-top: 0;
  margin-bottom: var(--space-md);
}

strong {
  font-weight: 700;
}

em {
  font-style: italic;
}

sup, sub {
  vertical-align: baseline;
  position: relative;
  font-size: 0.75em;
  line-height: 0;
}

sup { top: -0.4em; }
sub { top: 0.3em; }

mark {
  border-radius: var(--radius-base);
  padding: var(--space-2xs) var(--space-xs);
}

/* 4. Links */
a {
  color: var(--color-link);
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  text-decoration: underline;
}

a:focus {
  outline: none;
}

/* 5. Code & Preformatted Text */

/* Prism (code blocks) */
pre, pre[class*="language-"] {
  background-color: rgba(var(--color-code-background-rgb), 0.5) !important;
  padding: var(--space-md) !important;
  margin: var(--space-sm) 0 !important;
  border-radius: var(--radius-base) !important;
  overflow: auto !important;
}

/* Inline code */
code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9em;
  /*background-color: var(--color-code-inline);*/
  background-color: rgba(var(--color-code-background-rgb), 0.5) !important;
  border-radius: var(--radius-base);
  padding: var(--space-2xs) var(--space-xs);
}

/* Reset inline code styles inside pre blocks */
pre code {
  background-color: transparent;
  padding: 0;
  border-radius: 0;
}

/* 6. Block Elements */
blockquote {
  padding: 0 var(--space-sm);
  color: var(--color-text-quote);
  border-left: 0.25em solid var(--color-border-quote);
}

blockquote > :first-child { margin-top: 0; }
blockquote > :last-child { margin-bottom: 0; }

hr {
  height: 2px;
  padding: 0;
  margin: var(--space-lg) 0;
  background-color: var(--color-border-hr);
  border: 0;
}

/* 7. Tables */
table {
  display: block;
  width: 100%;
  overflow: auto;
  margin-top: 0;
  margin-bottom: var(--space-md);
  border-spacing: 0;
  border-collapse: collapse;
}

table th {
  font-weight: 600;
  padding: var(--space-xs) var(--space-md);
  border: var(--border-base) solid var(--color-border-table);
}

table td {
  padding: var(--space-xs) var(--space-md);
  border: var(--border-base) solid var(--color-border-table);
}

table tr {
  border-top: var(--border-base) solid var(--color-border-table-row);
}

table tr:nth-child(2n) {
  background-color: var(--color-background-table-alt);
}

/* 8. Media */
img {
  max-width: 100%;
  background-color: var(--color-background);
}

/* 9. Custom Styles */
header {
  margin-bottom: var(--space-lg);
}
footer {
  margin-top: var(--space-lg);
  font-size: 0.8rem;
}

.back-link {
  margin-bottom: var(--space-sm);
}

.back-link a {
  color: var(--color-text-primary);
  opacity: 0.8;
  transition: opacity 0.2s ease;
}

.back-link a:hover {
  opacity: 1;
  text-decoration: none;
}

header .avatar {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: 50%;
  margin-right: 0.5rem; 
  vertical-align: middle;
}

header h1 {
  margin: 0;
}

.header-name {
  display: inline-block;
  vertical-align: middle;
}

.header-links {
  font-size: 1rem;
  font-weight: normal;
}

.header-links a {
  color: var(--color-accent);
  opacity: 0.8;
  transition: opacity 0.2s ease;
}

.header-links a:hover {
  opacity: 1;
}

/* Post List */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-item {
  padding: var(--space-md) var(--space-md);
  /*border-bottom: var(--border-base) solid var(--color-border-base);*/
  border-left: 4px solid var(--color-border-base);
  transition: all 0.2s ease;
  margin-left: var(--space-xs);
  margin-bottom: var(--space-sm);
  background-color: var(--color-hover-background);
}

.post-link {
  display: block;
  color: var(--color-text-primary);
  text-decoration: none;
}

.post-link:hover {
  text-decoration: none;
}

.post-item:hover {
  border-left-color: var(--color-link);
}

@media (prefers-color-scheme: dark) {
  .post-item:hover {
    background-color: rgba(110, 118, 129, 0.1);
  }
}

.post-link h5 {
  margin-top: 0;
  margin-bottom: var(--space-sm);
}

.post-link p {
  margin-bottom: 0;
}