:root {
  /* Color Scheme */
  --body-bg: #f9f9f9;
  --text-color: #333;
  --text-muted-color: #666;
  --link-color: #007bff;
  --link-hover-color: #0056b3;
  --border-color: #ddd;
  --header-footer-bg: #eee;
  --main-bg: #fff;
  --code-bg: #f5f5f5; /* For inline code maybe? */
  --button-bg: #ddd;
  --button-hover-bg: #ccc;
  --dropdown-bg: #f1f1f1;
  --dropdown-hover-bg: #ddd;
  --dropdown-shadow: rgba(0,0,0,0.2);
  --social-icon-color: #333;
  --social-icon-hover-color: #000;
  --video-loading-bg: #eee;
}

body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 2em;
    background-color: var(--body-bg);
    color: var(--text-color);
}

header, footer {
    background-color: var(--header-footer-bg);
    padding: 1em;
    border-radius: 5px;
    text-align: center;
}

main {
    background-color: var(--main-bg);
    padding: 1.5em;
    margin-top: 1em;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

h1, h2, h3 {
    color: var(--text-color);
}

/* Navigation Styles */
nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    background-color: var(--button-bg);
    border-radius: 5px;
    display: flex; /* Arrange items horizontally */
}

nav ul li {
    position: relative; /* Needed for absolute positioning of dropdown */
}

nav ul li a,
.nav-button {
    display: block;
    padding: 0.8em 1.2em;
    text-decoration: none;
    color: var(--text-color);
    background: none;
    border: none;
    cursor: pointer;
    font: inherit;
}

nav ul li a:hover,
.nav-button:hover {
    background-color: var(--button-hover-bg);
}

/* Dropdown Menu Styles */
.dropdown-menu {
    position: absolute;
    left: 0;
    top: 100%;
    background-color: var(--dropdown-bg);
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px var(--dropdown-shadow);
    z-index: 1;
    border-radius: 0 0 5px 5px;
    padding: 0; /* Reset padding */
    margin: 0; /* Reset margin */
    list-style: none; /* Remove list bullets */
    /* Ensure it doesn't inherit flex properties */
    display: block; 
}

.dropdown-menu li {
    display: block; /* Ensure list items stack vertically */
}

.dropdown-menu li a {
    padding: 12px 16px;
    display: block;
    white-space: nowrap; /* Prevent wrapping */
    color: var(--text-color); 
    background-color: transparent; /* Ensure clean background */
}

.dropdown-menu li a:hover {
    background-color: var(--dropdown-hover-bg);
}

/* Page Meta */
.page-meta {
    margin-top: 0.25em; /* Further reduce space above page title block */
    padding-top: 0.25em; /* Further reduce padding inside page title block */
    border-top: 1px solid var(--header-footer-bg); /* Use header bg for subtle border */
}

/* Reduce Header Element Spacing */
header h1 {
    margin-top: 0.25em;
    margin-bottom: 0.25em;
}

header .page-meta h2 {
    margin-top: 0.1em;
    margin-bottom: 0.1em;
}

header .page-meta p {
    margin-top: 0.1em;
    margin-bottom: 0.1em;
    color: var(--text-muted-color); /* Muted color for meta */
}

/* Back Link Style */
.back-link a {
    display: inline-block;
    margin-top: 1.5em;
    padding: 0.5em 1em;
    background-color: var(--button-bg);
    color: var(--text-color);
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.back-link a:hover {
    background-color: var(--button-hover-bg);
}

/* Index Page Layout */
.index-layout {
    display: flex;
    flex-wrap: wrap; /* Allow wrapping on smaller screens if needed */
    gap: 2em; /* Space between columns */
}

.post-list-column {
    flex: 1; 
    min-width: 200px; 
    padding-right: 1em;
    border-right: 1px solid var(--border-color);
}

.post-list-column h2 {
    margin-top: 0; 
}

.post-list-column ul {
    list-style: none;
    padding: 0;
}

.post-list-column li {
    margin-bottom: 0.5em;
}

.home-content-column {
    flex: 2; 
    min-width: 300px; 
}

.home-content-column > :first-child {
    margin-top: 0; 
}

/* Footer Social Links */
.social-links {
    margin-top: 1em;
    padding-top: 1em;
    border-top: 1px solid var(--border-color);
}

.social-links a {
    display: inline-block;
    margin: 0 0.5em;
    color: var(--social-icon-color);
    font-size: 1.5em;
    text-decoration: none;
    transition: color 0.2s ease;
}

.social-links a:hover {
    color: var(--social-icon-hover-color);
}

/* Responsive Video Embed */
.video-wrapper {
    position: relative; 
    overflow: hidden;
    max-width: 640px; 
    background: var(--video-loading-bg);
    margin: 0 auto 1em auto; 
    aspect-ratio: 16 / 9; 
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* Additions for Prism.js - Basic Adaption */
/* You might need more specific overrides depending on the theme */
code[class*="language-"],
pre[class*="language-"] {
    color: var(--text-color); /* Default text color */
    background: var(--code-bg); /* Light background for code blocks */
    text-shadow: none; /* Remove default shadow if present */
}

/* Override specific Prism theme elements if needed */
.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
    color: var(--text-muted-color); /* Muted color for comments */
}

/* (Add more .token overrides as needed based on your chosen Prism theme) */

a { /* Basic link styling */
    color: var(--link-color);
    text-decoration: none;
}

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

/* Responsive Adjustments */
@media (max-width: 768px) {
    nav ul {
        flex-wrap: wrap;
        justify-content: center; /* Center items when they wrap */
    }
    
    /* Optional: Add a little space below wrapped items */
    nav ul li {
        margin-bottom: 5px;
    }

    /* Position dropdown relative to the right edge on small screens */
    .dropdown-menu {
        left: auto;
        right: 0;
    }

    /* Adjust index page layout for single column */
    .index-layout {
        flex-direction: column;
    }

    .post-list-column {
        border-right: none; /* Remove border */
        padding-right: 0;
        margin-bottom: 1.5em; /* Add space below post list */
        border-bottom: 1px solid var(--border-color); /* Add bottom border */
        padding-bottom: 1.5em; /* Add padding below post list */
    }
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
  :root {
    /* Dark Scheme */
    --body-bg: #1a1a1a;
    --text-color: #e0e0e0;
    --text-muted-color: #888;
    --link-color: #58a6ff;
    --link-hover-color: #80bfff;
    --border-color: #444;
    --header-footer-bg: #2a2a2a;
    --main-bg: #242424;
    --code-bg: #333; 
    --button-bg: #444;
    --button-hover-bg: #555;
    --dropdown-bg: #3a3a3a;
    --dropdown-hover-bg: #4a4a4a;
    --dropdown-shadow: rgba(0,0,0,0.5);
    --social-icon-color: #ccc;
    --social-icon-hover-color: #fff;
    --video-loading-bg: #333;
  }

  /* Optional: Dark mode specific overrides */
  /* e.g., making images slightly less bright */
  /* img {
    filter: brightness(.85) contrast(1.1);
  } */

  /* Add specific dark overrides for Prism if needed */
  pre[class*="language-"] {
      background: var(--code-bg); 
  }
}