:root {
    --primary-bg: #0a0e1a;
    --secondary-bg: #1a1f36;
    --card-bg: #101528;
    --border-color: #2a3150;
    --primary-text: #e0e0e0;
    --secondary-text: #a0a0c0;
    --accent-color: #00bfff;
    --accent-hover: #00a0cc;
    --font-family: 'Inter', sans-serif;
}

/* --- General Reset & Typography --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

h1, h2, h3, h4 {
    color: var(--accent-color);
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.2rem; }

p {
    margin-bottom: 1rem;
    color: var(--secondary-text);
}

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

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

img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
}

/* --- Layout & Structure --- */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.main-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem 0;
}

@media (min-width: 992px) {
    .main-layout {
        grid-template-columns: 3fr 1fr;
    }
}

/* --- Header & Navigation --- */
.site-header {
    background-color: var(--secondary-bg);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.site-title a {
    font-size: 1.8rem;
    font-weight: bold;
    color: #fff;
    text-decoration: none;
}
.site-title a:hover {
    color: var(--accent-color);
}

.main-nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.main-nav a {
    color: var(--primary-text);
    font-weight: 500;
    padding: 0.5rem;
}

.main-nav a:hover, .main-nav a.active {
    color: var(--accent-color);
    text-decoration: none;
}

/* --- Main Content & Articles --- */
.main-content, .article-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.page-intro h1 {
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.blog-articles-section {
    margin-top: 3rem;
}

.article-preview {
    background-color: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-preview:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 191, 255, 0.1);
}

.read-more-btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--primary-bg);
    padding: 0.6rem 1.2rem;
    border-radius: 5px;
    font-weight: bold;
    text-decoration: none;
    margin-top: 1rem;
    transition: background-color 0.3s ease;
}

.read-more-btn:hover {
    background-color: var(--accent-hover);
    color: #fff;
}

/* --- Article Detail Page --- */
.article-header {
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.article-meta {
    font-size: 0.9rem;
    color: var(--secondary-text);
    margin-top: 0.5rem;
}

.article-content h2, .article-content h3 {
    margin-top: 2rem;
}

.article-content ul {
    list-style-position: inside;
    padding-left: 1rem;
    margin-bottom: 1rem;
}

.article-content li {
    margin-bottom: 0.5rem;
    color: var(--secondary-text);
}

.cta-box {
    background-color: var(--secondary-bg);
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
}
.cta-box p {
    margin-bottom: 0.5rem;
}
.cta-box a {
    font-weight: bold;
}

/* --- Sidebar --- */
.sidebar {
    position: sticky;
    top: 2rem;
}

.widget {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.widget-title {
    font-size: 1.3rem;
    color: #fff;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

.widget ul {
    list-style: none;
}

.widget ul li {
    margin-bottom: 0.75rem;
}

.widget ul li a {
    color: var(--secondary-text);
}

.widget ul li a:hover {
    color: var(--accent-color);
}

.promo-widget p {
    background-color: var(--secondary-bg);
    padding: 1rem;
    border-radius: 5px;
    font-weight: 500;
    text-align: center;
    color: var(--primary-text);
}

/* --- Footer --- */
.site-footer {
    background-color: var(--secondary-bg);
    color: var(--secondary-text);
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
}

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }

    .main-content, .article-content, .widget {
        padding: 1.5rem;
    }
}
