/* 
 * Terminal Theme for BSSG
 * Simulates an old teletype/terminal output with monospace text 
 * on a simple background, with a character-by-character "print" effect.
 * Enhanced with accessibility, performance, and compatibility improvements.
 */

/* Reduced motion support */
@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;
    }
    
    /* Disable all terminal effects for reduced motion */
    .tty-effect {
        animation: none !important;
        visibility: visible !important;
        opacity: 1 !important;
    }
    
    body::before,
    .container::before {
        display: none !important;
    }
}

:root {
    /* Colors - retro terminal */
    --terminal-black: #000000;
    --terminal-green: #e60073;
    --terminal-amber: #ffb000;
    --terminal-dim-green: #e60073;
    --terminal-gray: #808080;
    --terminal-light-gray: #c0c0c0;
    
    /* Theme color assignments */
    --bg-color: var(--terminal-black);
    --text-color: var(--terminal-green);
    --heading-color: var(--terminal-green);
    --link-color: var(--terminal-amber);
    --link-hover: var(--terminal-light-gray);
    --border-color: var(--terminal-dim-green);
    --code-bg: rgba(0, 85, 0, 0.3);
    --cursor-color: var(--terminal-green);
    
    /* Typography - system monospace fonts for terminal aesthetic */
    --font-main: 'Courier New', 'Liberation Mono', 'DejaVu Sans Mono', 'Consolas', 'Monaco', 'Andale Mono', 'Ubuntu Mono', monospace;
    --font-headings: 'Courier New', 'Liberation Mono', 'DejaVu Sans Mono', 'Consolas', 'Monaco', 'Andale Mono', 'Ubuntu Mono', monospace;
    --font-mono: 'Courier New', 'Liberation Mono', 'DejaVu Sans Mono', 'Consolas', 'Monaco', 'Andale Mono', 'Ubuntu Mono', monospace;
    
    /* Font sizes */
    --text-xs: 0.8rem;
    --text-sm: 0.9rem;
    --text-base: 1rem;
    --text-md: 1.1rem;
    --text-lg: 1.3rem;
    --text-xl: 1.5rem;
    
    /* Sizing */
    --content-width: 90%;
    --max-content-width: 900px;
    --line-height: 1.5;
    --line-height-tight: 1.3;
    --character-width: 0.6em; /* For cursor animation */
    --cursor-blink-speed: 0.8s;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.2s;
    --transition-medium: 0.3s;
}

/* Base elements */
html {
    background-color: var(--bg-color);
    font-size: 16px;
    scrollbar-color: var(--terminal-dim-green) var(--terminal-black);
    scrollbar-width: thin;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: var(--line-height);
    margin: 0;
    padding: var(--spacing-sm);
    position: relative;
}

/* Progressive enhancement for terminal effects */
@supports (background-image: linear-gradient(rgba(0, 255, 0, 0.03) 1px, transparent 1px)) {
    body {
        /* Terminal scanlines effect - reduced intensity */
        background-image: linear-gradient(
            rgba(0, 255, 0, 0.02) 1px, 
            transparent 1px
        );
        background-size: 100% 3px;
        /* CRT glow effect - reduced intensity */
        box-shadow: 0 0 10px rgba(0, 255, 0, 0.03) inset;
    }
}

/* Progressive enhancement for CRT vignette effect */
@supports (background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.2) 80%)) {
    body::before {
        content: "";
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: radial-gradient(
            ellipse at center,
            rgba(0, 0, 0, 0) 0%,
            rgba(0, 0, 0, 0.1) 80%,
            rgba(0, 0, 0, 0.2) 100%
        );
        pointer-events: none;
        z-index: 2;
        opacity: 0.5;
    }
}

/* Scrollbars - webkit */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--terminal-black);
}

::-webkit-scrollbar-thumb {
    background: var(--terminal-dim-green);
    border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--terminal-green);
}

.container {
    width: var(--content-width);
    max-width: var(--max-content-width);
    margin: var(--spacing-md) auto;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    position: relative;
    /* Simulate an old terminal window */
    overflow: hidden;
}

/* Progressive enhancement for container scanlines */
@supports (background: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.1) 1px)) {
    .container::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: repeating-linear-gradient(
            0deg,
            rgba(0, 0, 0, 0.05),
            rgba(0, 0, 0, 0.05) 1px,
            rgba(0, 0, 0, 0) 1px,
            rgba(0, 0, 0, 0) 3px
        );
        pointer-events: none;
        z-index: 1;
        opacity: 0.2;
    }
}

/* Terminal header */
header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px dashed var(--border-color);
}

/* Terminal prompt in header */
.site-title {
    font-size: var(--text-xl);
    margin: 0 0 var(--spacing-xs) 0;
    position: relative;
    padding-left: 1.2em;
}

.site-title::before {
    content: ">";
    position: absolute;
    left: 0;
    color: var(--terminal-green);
}

.site-title a {
    color: var(--text-color);
    text-decoration: none;
    display: inline-block;
    /* Simulate typewriter effect */
    white-space: nowrap;
    overflow: hidden;
    border-right: 0.1em solid var(--cursor-color);
    animation: typing 3.5s steps(40, end), 
               blink-caret var(--cursor-blink-speed) step-end infinite;
}

/* Site description */
header p {
    font-size: var(--text-base);
    margin: var(--spacing-sm) 0;
    max-width: 600px;
    padding-left: 1.2em;
    opacity: 0.9;
}

/* Terminal-style navigation */
nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
    padding-left: 1.2em;
}

nav::before {
    content: "$ ";
    color: var(--terminal-green);
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    padding: 0.2em 0.4em;
    margin-right: var(--spacing-xs);
    position: relative;
    transition: all var(--transition-fast);
}

nav a:hover, 
nav a.active {
    color: var(--terminal-amber);
    background-color: rgba(0, 0, 0, 0.3);
}

nav a::before {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--terminal-dim-green);
    transform: scaleX(0);
    transition: transform var(--transition-medium) ease;
}

nav a:hover::before, 
nav a.active::before {
    transform: scaleX(1);
}

/* Main content */
main {
    min-height: 50vh;
    padding-bottom: var(--spacing-lg);
    /* Prepare for the typewriter effect on content */
    position: relative;
}

/* Typography for terminal */
h1, h2, h3 {
    font-weight: normal;
    margin: var(--spacing-md) 0 var(--spacing-xs) 0;
    line-height: 1.3;
    position: relative;
    padding-left: 2em; /* Sufficient padding for 1-3 # symbols */
}

h4, h5, h6 {
    font-weight: normal;
    margin: var(--spacing-md) 0 var(--spacing-xs) 0;
    line-height: 1.3;
    position: relative;
    padding-left: 3.5em; /* Increased padding for 4-6 # symbols */
}

h1::before, h2::before, h3::before {
    position: absolute;
    left: 0;
    top: 0;
    color: var(--terminal-amber);
    width: 1.8em; /* Sufficient width for 1-3 # symbols */
}

h4::before, h5::before, h6::before {
    position: absolute;
    left: 0;
    top: 0;
    color: var(--terminal-amber);
    width: 3.2em; /* Sufficient width for 4-6 # symbols */
}

h1::before { content: "#"; }
h2::before { content: "##"; }
h3::before { content: "###"; }
h4::before { content: "####"; }
h5::before { content: "#####"; }
h6::before { content: "######"; }

h1 {
    font-size: var(--text-xl);
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: var(--spacing-xs);
}

h2 {
    font-size: var(--text-lg);
}

h3 {
    font-size: var(--text-md);
}

p {
    margin: var(--spacing-sm) 0;
    position: relative;
    padding-left: 1.2em;
}

p::before {
    content: ">";
    position: absolute;
    left: 0;
    color: var(--terminal-dim-green);
}

/* Links with command-like styling */
a {
    color: var(--link-color);
    text-decoration: none;
    border-bottom: 1px dotted var(--link-color);
    position: relative;
    transition: all var(--transition-fast);
}

a:hover {
    color: var(--link-hover);
    background-color: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--link-hover);
}

/* Accessibility: Focus outlines for all interactive elements */
a:focus,
nav a:focus,
.tags a:focus,
.pagination a:focus {
    outline: 2px solid var(--terminal-amber);
    outline-offset: 2px;
    background-color: rgba(255, 176, 0, 0.1);
}

/* Article styling */
article {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

/* Text browser fallback for article header */
article::before {
    content: "Article:";
    color: var(--terminal-green);
    display: block;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px dashed var(--border-color);
}

/* Progressive enhancement for terminal command */
@supports (content: "cat article.txt") {
    article::before {
        content: "cat article.txt";
    }
}

article h1 {
    margin-top: var(--spacing-sm);
}

/* Article metadata */
article .meta {
    font-size: var(--text-sm);
    color: var(--terminal-dim-green);
    margin: var(--spacing-xs) 0 var(--spacing-md);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    padding-left: 1.2em;
}

/* Reading time */
.reading-time {
    display: flex;
    align-items: center;
    gap: 0.3em;
}

/* Text browser fallback for reading time */
.reading-time::before {
    content: "Time: ";
    font-size: var(--text-base);
}

/* Progressive enhancement for decorative symbol */
@supports (content: "⧗") {
    .reading-time::before {
        content: "⧗";
    }
}

/* Tags */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    justify-content: center;
}

.tags a {
    color: var(--terminal-amber);
    background-color: rgba(0, 0, 0, 0.2);
    padding: 0.1em 0.4em;
    border: 1px solid var(--terminal-dim-green);
    text-decoration: none;
    font-size: var(--text-xs);
}

.tags a:hover {
    background-color: rgba(0, 0, 0, 0.4);
    color: var(--terminal-light-gray);
}

/* Code blocks */
pre, code {
    font-family: var(--font-mono);
    background-color: var(--code-bg);
    border: 1px solid var(--border-color);
}

code {
    padding: 0.1em 0.3em;
    font-size: var(--text-sm);
}

pre {
    padding: var(--spacing-sm);
    margin: var(--spacing-sm) 0;
    overflow-x: auto;
    line-height: var(--line-height-tight);
    position: relative;
}

/* Text browser fallback for code header */
pre::before {
    content: "Code:";
    color: var(--terminal-green);
    display: block;
    margin-bottom: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px dashed var(--border-color);
}

/* Progressive enhancement for terminal command */
@supports (content: "$ cat code.txt") {
    pre::before {
        content: "$ cat code.txt";
    }
}

pre code {
    background-color: transparent;
    padding: 0;
    border: none;
}

/* Blockquote */
blockquote {
    margin: var(--spacing-md) 0;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: rgba(0, 0, 0, 0.2);
    border-left: 3px solid var(--terminal-amber);
    position: relative;
}

/* Text browser fallback for blockquote decorations */
blockquote::before {
    content: "Quote: ";
    position: absolute;
    top: 0;
    left: 0;
    font-size: var(--text-xs);
    color: var(--terminal-gray);
    padding: 0.2em 0.4em;
}

blockquote::after {
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    font-size: var(--text-xs);
    color: var(--terminal-gray);
    padding: 0.2em 0.4em;
}

/* Progressive enhancement for terminal command */
@supports (content: "echo '") {
    blockquote::before {
        content: "echo '";
    }
    
    blockquote::after {
        content: "'";
    }
}

blockquote p {
    margin: var(--spacing-xs) 0;
    padding-left: 0;
}

blockquote p::before {
    content: none;
}

/* Lists with proper spacing to prevent overlap */
ul, ol {
    margin: var(--spacing-sm) 0;
    padding-left: 4em; /* Increased to prevent overlap */
    position: relative;
}

ul::before, ol::before {
    position: absolute;
    left: 0;
    top: 0;
    color: var(--terminal-dim-green);
    width: 3.5em; /* Ensure sufficient width */
}

/* Text browser fallbacks for list headers */
ul::before {
    content: "List:";
}

ol::before {
    content: "List:";
}

/* Progressive enhancement for terminal commands */
@supports (content: "ls:") {
    ul::before {
        content: "ls:";
    }
    
    ol::before {
        content: "seq:";
    }
}

li {
    margin-bottom: var(--spacing-xs);
    position: relative;
}

ul li::before {
    content: "- ";
    color: var(--terminal-dim-green);
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--border-color);
    filter: grayscale(50%) sepia(20%) hue-rotate(80deg) brightness(1.1) contrast(1.2);
    image-rendering: pixelated;
}

figure {
    margin: var(--spacing-md) 0;
    position: relative;
}

/* Text browser fallback for figure header */
figure::before {
    content: "Image:";
    color: var(--terminal-green);
    display: block;
    margin-bottom: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px dashed var(--border-color);
}

/* Progressive enhancement for terminal command */
@supports (content: "cat image.jpg") {
    figure::before {
        content: "cat image.jpg";
    }
}

figcaption {
    font-size: var(--text-sm);
    padding: var(--spacing-xs);
    color: var(--terminal-gray);
    text-align: center;
}

/* Post list */
.posts-list article {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px dashed var(--border-color);
}

.posts-list article::before {
    content: "cat post_" attr(data-index) ".txt";
    display: block;
    margin-bottom: var(--spacing-xs);
}

.posts-list h2,
.posts-list h3 {
    margin-top: 0;
    font-size: var(--text-md);
    padding-left: 1.5em; /* Increased to prevent overlap */
    position: relative;
}

.posts-list h2::before,
.posts-list h3::before {
    position: absolute;
    left: 0;
    top: 0;
    color: var(--terminal-amber);
    content: "##";
    width: 1.3em; /* Ensure sufficient width */
}

.posts-list article p:last-child {
    margin-bottom: 0;
}

/* Terminal footer */
footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-sm);
    border-top: 1px dashed var(--border-color);
    font-size: var(--text-sm);
    text-align: center;
    position: relative;
}

/* Text browser fallback for footer */
footer::before {
    content: "End";
    color: var(--terminal-green);
    display: block;
    text-align: left;
    margin-bottom: var(--spacing-sm);
}

/* Progressive enhancement for terminal command */
@supports (content: "exit") {
    footer::before {
        content: "exit";
    }
}

footer p {
    margin: var(--spacing-xs) 0;
    padding-left: 0;
}

footer p::before {
    content: none;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-sm);
    border-top: 1px dashed var(--border-color);
}

.pagination a {
    color: var(--text-color);
    text-decoration: none;
    padding: 0.3em 0.6em;
    border: 1px solid var(--terminal-dim-green);
    background-color: rgba(0, 0, 0, 0.2);
    transition: all var(--transition-fast);
}

.pagination a:hover {
    border-color: var(--terminal-amber);
    background-color: rgba(0, 0, 0, 0.4);
    color: var(--terminal-amber);
}

/* Terminal typing and cursor animations */
@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}

@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: var(--cursor-color) }
}

/* Apply a simulated delayed "typing" effect on page load */
.tty-effect {
    visibility: hidden;
    opacity: 0;
    animation: appear 0.1s forwards;
    animation-delay: calc(var(--tty-index) * 0.05s);
}

@keyframes appear {
    to {
        visibility: visible;
        opacity: 1;
    }
}

/* Responsive styles */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .container {
        width: 95%;
        padding: var(--spacing-sm);
    }

    nav {
        flex-direction: column;
        align-items: flex-start;
    }

    nav a {
        margin-bottom: var(--spacing-xs);
    }

    h1, h2, h3, p {
        padding-left: 1.5em; /* Reduced but still sufficient padding for mobile */
    }
    
    h4, h5, h6 {
        padding-left: 2.5em; /* Reduced but still sufficient padding for mobile */
    }
    
    h1 {
        font-size: var(--text-lg);
    }
    
    h2 {
        font-size: var(--text-md);
    }
    
    h3 {
        font-size: var(--text-base);
    }
}

/* Print styles */
@media print {
    body {
        background: white;
        color: black;
    }

    .container {
        max-width: 100%;
        border: none;
        padding: 0;
    }

    a {
        color: #006600;
        text-decoration: underline;
    }

    nav, footer {
        display: none;
    }
}

/* Center tags listings */
.tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* Ensure tag/archive headings are properly aligned */
.tag-title,
.archive-title {
    text-align: center;
}