/* --- CSS Custom Properties for Neon Colors --- */
:root {
    --neon-blue: #2dd9fe; /* Primary color: Cyan/Blue */
    --neon-blue-glow: #00a3d5; 
    --neon-pink: #ff008d; /* Secondary color: Magenta/Pink */
    --neon-pink-glow: #e10361;
    --dark-bg: #10101a; /* Very dark background */
    --text-color: #f0f0f0; /* Light text */
    --valid-color: #00ff66; /* Bright Green for success/valid states */
}

/* --- Global Styles: Dark Background and Font --- */
body {
    font-size: 1.2rem;
    background-color: var(--dark-bg);
    color: var(--text-color);
    font-family: 'Times New Roman', Times, serif,Arial, Helvetica, sans-serif,'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif,Georgia, 'Times New Roman', Times, serif;
    margin: 0;
    padding: 0;
    line-height: 1.8; /* Increased line-height for readability */
}

/* --- Header and Logo --- */
header {
    background-color: #0d0d15;
    border-bottom: 2px solid var(--neon-blue);
    margin-bottom: 20px;
}

header img {
    display: block;
    margin: 0 auto;
    width: 80px;
    filter: drop-shadow(0 0 10px var(--neon-pink)); /* Apply glow to logo */
    padding-top: 20px;
}

/* Main Header Neon Glow */
header h1, header h3 {
    text-align: center;
    text-transform: uppercase;
    padding: 10px 0;
    margin: 0;
    /* Stacked text-shadows for the glow effect */
    text-shadow: 
        0 0 5px #fff,
        0 0 10px #fff,
        0 0 20px var(--neon-blue),
        0 0 40px var(--neon-blue),
        0 0 80px var(--neon-blue-glow);
}

header h1 {
    color: #fff;
    font-size: 3em;
}

header h3 {
    color: var(--neon-blue);
    font-size: 1.5em;
    padding-bottom: 20px;
}


/* --- Typography and Structure --- */
.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 20px;
}

.large {
    display: block;
    font-size: 1.7em;
    color: var(--neon-blue);
    text-shadow: 0 0 5px var(--neon-blue-glow);
    margin-top: 20px;
    font-weight: bold;
}

.larger {
    display: block;
    font-size: 2em;
    color: var(--neon-pink);
    text-shadow: 0 0 5px var(--neon-pink-glow);
    margin-top: 30px;
    font-weight: bold;
}

ul {
    list-style-type: none;
    padding-left: 0;
}

li::before {
    content: "⚡ ";
    color: var(--neon-pink);
}

/* --- Code and Examples --- */
.example {
    background-color: #1a1a2e;
    border: 1px solid var(--neon-blue);
    box-shadow: 0 0 10px rgba(45, 217, 254, 0.5);
    padding: 15px;
    margin: 15px 0;
    white-space: pre-wrap;
    font-size: 0.9em;
    color: #f8f8ff;
    border-radius: 5px;
}

/* --- Tables --- */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    box-shadow: 0 0 15px rgba(255, 0, 141, 0.3);
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #333;
}

th {
    background-color: var(--neon-pink);
    color: var(--dark-bg);
    font-weight: bold;
    text-shadow: none;
    text-transform: uppercase;
}

tr:nth-child(even) {
    background-color: #131320; /* Subtle stripe effect */
}

/* --- Separator Line --- */
hr {
    border: none;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--neon-blue-glow), transparent);
    margin: 40px 0;
}

/* =======================================
   ⚡ PSEUDO-ELEMENT SPECIFIC STYLES ⚡
   ======================================= */

/* 1. ::before & ::after (Content Generation) */
.content-ex::before {
  content: "👉 ";
  color: var(--neon-blue);
}
.content-ex::after {
  content: " 💡";
  color: var(--neon-pink);
}

/* 2. ::first-line (Text Formatting) */
.first-line-output::first-line {
  font-variant: small-caps;
  color: var(--neon-pink);
}

/* 3. ::first-letter (Text Formatting) */
.first-letter-output::first-letter {
  font-size: 3em;
  color: var(--neon-blue);
  float: left;
  margin-right: 10px;
} 

/* 4. ::selection (User Interaction) */
.selection-output::selection { 
  background: var(--neon-pink); 
  color: var(--dark-bg); 
} 

/* 5. ::marker (List Styling) */
.marker-output li::marker { 
  content: "★ "; 
  color: var(--neon-blue); 
  font-size: 1.2em; 
} 

/* 6. ::placeholder (Form Styling) */
.placeholder-output::placeholder { 
  color: var(--neon-pink); 
  opacity: 0.8; 
  font-style: italic; 
} 

/* 10. ::file-selector-button (Form Styling) */
.file-selector-output::file-selector-button {
  background-color: var(--neon-blue);
  color: var(--dark-bg);
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.file-selector-output::file-selector-button:hover {
    background-color: var(--neon-blue-glow);
}

/* 14. ::-webkit-autofill (Form Styling - Vendor Prefixed) */
/* Crucial for overriding the browser's default yellow/white background */
.autofill-output:-webkit-autofill,
.autofill-output:-webkit-autofill:hover,
.autofill-output:-webkit-autofill:focus,
.autofill-output:-webkit-autofill:active {
  -webkit-box-shadow: 0 0 0 1000px #2b2b1a inset !important; /* Dark background color */
  -webkit-text-fill-color: var(--valid-color) !important; /* Bright green text */
}
.autofill-output {
    background-color: #2b2b1a; /* Ensure the default state matches the autofill style */
    border: 1px solid var(--neon-blue);
    padding: 8px;
    color: var(--text-color);
}

/* 15. ::-webkit-slider-thumb / ::-webkit-slider-runnable-track (Form Styling - Vendor Prefixed) */
.slider-output {
    
    width: 100%;
    height: 8px;
    background: #333;
    outline: none;
    margin: 10px 0;
}

.slider-output::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--neon-pink);
    cursor: pointer;
    box-shadow: 0 0 10px var(--neon-pink-glow);
    margin-top: -6px; /* Center thumb on track */
}

.slider-output::-webkit-slider-runnable-track {
    background: linear-gradient(to right, var(--neon-blue), #555);
    border-radius: 4px;
    box-shadow: 0 0 5px rgba(45, 217, 254, 0.5);
}

/* 17. ::-webkit-search-decoration (Form Styling - Vendor Prefixed) */
.search-output::-webkit-search-decoration,
.search-output::-webkit-search-cancel-button {
  display: none; /* Hides the magnifying glass and clear button for a custom look */
}
.search-output {
    padding: 10px;
    background-color: #1a1a2e;
    border: 1px solid var(--neon-blue);
    color: var(--text-color);
    box-shadow: 0 0 5px var(--neon-blue-glow);
}

/* 19. ::grammar-error & 20. ::spelling-error (Error Highlighting - Vendor Prefixed) */
/* Applying non-prefixed versions for documentation, but vendor prefixes (like -webkit- for Chrome) are usually needed in practice. */
::grammar-error { 
  border-bottom: 2px dotted var(--neon-blue); 
  background-color: rgba(45, 217, 254, 0.1); 
} 

::spelling-error { 
  background-color: rgba(255, 0, 141, 0.2); 
  border-bottom: 2px dashed var(--neon-pink); 
} 

/* --- Footer --- */
footer {
    background-color: #0d0d15;
    padding: 20px;
    text-align: center;
    border-top: 3px solid var(--neon-blue);
    margin-top: 50px;
}

.footer-nav h3 {
    color: var(--neon-pink);
    text-shadow: 0 0 5px var(--neon-pink);
    margin: 20px 0 10px;
}

/* Footer Navigation Buttons */
.footer-nav button {
    background: transparent;
    border: 2px solid var(--neon-blue);
    padding: 10px 20px;
    box-shadow: 0 0 10px var(--neon-blue-glow);
    transition: all 0.3s;
    cursor: pointer;
    margin: 5px;
}

.footer-nav button:hover {
    background: var(--neon-blue);
    box-shadow: 0 0 15px var(--neon-blue-glow), 0 0 20px var(--neon-blue);
}

.footer-nav button a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: bold;
}

.footer-nav button:hover a {
    color: var(--dark-bg);
}

/* Footer Topic List */
.footer-nav nav ol {
    list-style: none;
    padding: 0;
    margin: 0;
    column-count: 2; /* Two columns for the long list */
    column-gap: 30px;
    text-align: left;
    max-width: 600px;
    margin: 20px auto;
}

.footer-nav nav ol li {
    padding: 5px 0;
    border-bottom: 1px dotted #222;
}

.footer-nav nav ol li::before {
    content: "::"; /* Different marker for the list */
    color: var(--neon-pink);
    margin-right: 5px;
}

.footer-nav nav ol li a {
    color: #aaa;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-nav nav ol li a:hover {
    color: var(--neon-blue);
    text-shadow: 0 0 3px var(--neon-blue-glow);
}

/* Footer Bottom */
.footer-bottom {
    margin-top: 20px;
    padding-top: 10px;
    border-top: 1px dotted #333;
}

.footer-links a {
    color: #666;
    text-decoration: none;
    margin: 0 10px;
    font-size: 0.9em;
}

.footer-links a:hover {
    color: var(--neon-pink);
}

.copyright {
    color: #444;
    font-size: 0.8em;
}

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
    .footer-nav nav ol {
        column-count: 1;
        max-width: none;
    }
}