/* --- Variables & Global Styles --- */
:root {
    --font-primary: 'JetBrains Mono', monospace;
    --color-background: #0d1117;
    --color-surface: #161b22;
    --color-text: #c9d1d9;
    --color-text-muted: #8b949e;
    --color-primary: #58a6ff;
    --color-accent: #f778ba; 
    --color-border: #30363d;
    --container-width: 1200px;
    --glow-color: rgba(88, 166, 255, 0.5);
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 16px;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease, text-shadow 0.3s ease;
}

a:hover {
    color: #fff;
    text-shadow: 0 0 8px var(--glow-color);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

article:hover img {
    opacity: 1;
}

/* --- Header & Navigation --- */
.site-header {
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
    background-color: rgba(13, 17, 23, 0.8);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-size: 1.8rem;
    font-weight: 700;
}
.site-title a {
    color: #fff;
    text-shadow: 0 0 10px var(--glow-color);
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
}

.main-nav a {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-text-muted);
    position: relative;
    padding: 5px 0;
}
.main-nav a.active, .main-nav a:hover {
    color: var(--color-primary);
}
.main-nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-primary);
    transition: width 0.3s ease;
}
.main-nav a:hover::after, .main-nav a.active::after {
    width: 100%;
}

/* --- Main Content Layout --- */
main.container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 40px;
    padding-bottom: 40px;
}

@media (min-width: 992px) {
    main.container {
        grid-template-columns: 2.5fr 1fr;
    }
}

/* --- Article Styles --- */
article {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
article:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 20px rgba(88, 166, 255, 0.2);
}

.article-content {
    padding: 15px;
}

.category-tag {
    display: inline-block;
    background-color: var(--color-primary);
    color: var(--color-background);
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.featured-article .article-content {
    padding: 30px;
}

.featured-article h2 {
    font-size: 2.2rem;
    margin-bottom: 15px;
}
.featured-article h2 a {
    color: #fff;
}

.featured-article p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--color-text-muted);
}

.section-title {
    font-size: 1.8rem;
    padding-bottom: 10px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-primary);
}

.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

@media (min-width: 768px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.grid-item {
    display: flex;
    flex-direction: column;
}

.grid-item .article-content {
    padding: 20px;
    flex-grow: 1;
}

.grid-item h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.grid-item h3 a {
    color: var(--color-text);
}

.grid-item p {
    margin-bottom: 15px;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}


/* --- Sidebar --- */
.sidebar {
    position: sticky;
    top: 120px;
    align-self: start;
}

.widget-box {
    background-color: var(--color-surface);
    padding: 25px;
    margin-bottom: 30px;
    border: 1px solid var(--color-border);
}

.sidebar h3 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--color-primary);
}

.sidebar p {
    color: var(--color-text-muted);
    line-height: 1.6;
}

.sidebar ul {
    list-style: none;
}

.sidebar ul li {
    margin-bottom: 10px;
}

.sidebar ul a {
    font-weight: 400;
    color: var(--color-text);
}
.sidebar ul a:hover {
    color: var(--color-primary);
}


/* --- Article Page --- */
.article-page main.container {
    display: block;
    max-width: 800px;
}

.article-page article {
    padding: 40px;
}

.article-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-border);
}

.article-header h1 {
    font-size: 2.8rem;
    line-height: 1.2;
    color: #fff;
    text-shadow: 0 0 15px var(--glow-color);
}

.article-header .article-meta {
    margin-top: 20px;
    font-size: 1rem;
}

.article-body {
    font-size: 1.1rem;
}

.article-body img {
    margin: 30px 0;
    border: 1px solid var(--color-border);
}

.article-body p {
    margin-bottom: 1.5em;
    color: var(--color-text-muted);
}
.article-body p:first-of-type {
    color: var(--color-text);
}


.article-body h2 {
    font-size: 1.8rem;
    margin-top: 2em;
    margin-bottom: 1em;
    color: var(--color-primary);
    border-left: 3px solid var(--color-primary);
    padding-left: 15px;
}

.article-body h3 {
    font-size: 1.4rem;
    margin-top: 1.5em;
    margin-bottom: 1em;
    color: var(--color-accent);
}

/* --- Footer --- */
.site-footer {
    background-color: var(--color-surface);
    color: var(--color-text-muted);
    text-align: center;
    padding: 25px 0;
    margin-top: 40px;
    border-top: 1px solid var(--color-border);
    font-size: 0.9rem;
}