/* 1. CSS Variables for Easy Customization */
:root {
    --primary-color: #419fa4;
    --primary-light: #5cb3b8;
    --text-color: #2b2c2d;
    --text-light: #666666;
    --background-color: #f8fafb;
    --content-bg: #e2e9e9;
    --border-color: #d0d6d6;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 16px rgba(0, 0, 0, 0.12);
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-heading: 'Georgia', 'Garamond', serif;
}

/* 2. Global Reset and Body Styling */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--background-color);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 3. Header Styling */
.site-header {
    background-color: var(--primary-color);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.site-header h1 a {
    color: rgb(220, 220, 221);
    text-decoration: none;
    font-size: 1.5em;
    font-family: var(--font-heading);
    font-weight: 600;
    letter-spacing: -0.5px;
}

.site-header nav a {
    color: rgb(219, 224, 224);
    text-decoration: none;
    margin-left: 24px;
    font-weight: 500;
    font-size: 15px;
    position: relative;
    transition: color 0.3s ease;
}

.site-header nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: rgb(220, 220, 221);
    transition: width 0.3s ease;
}

.site-header nav a:hover {
    color: #ffffff;
}

.site-header nav a:hover::after {
    width: 100%;
}

/* 4. Main Layout (Using Grid for Content + Sidebar) */
.content-container {
    max-width: 1000px;
    margin: 60px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 2.5fr 1fr;
    gap: 48px;
}

/* 5. Post List Styling (Home Page) */
.post-list h2 {
    font-size: 2.2em;
    margin-bottom: 32px;
    color: var(--text-color);
    font-weight: 600;
    letter-spacing: -0.5px;
}

.blog-post-card {
    background: var(--content-bg);
    padding: 28px;
    margin-bottom: 28px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.blog-post-card:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.blog-post-card h3 {
    font-size: 1.5em;
    margin-bottom: 8px;
    font-weight: 600;
}

.blog-post-card h3 a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
    font-family: var(--font-heading);
}

.blog-post-card h3 a:hover {
    color: var(--primary-light);
}

.post-meta {
    font-size: 0.9em;
    color: var(--text-light);
    margin: 8px 0 16px 0;
    font-weight: 500;
}

.post-summary {
    font-size: 1em;
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 16px;
}

.read-more-btn {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    margin-top: 12px;
    padding: 8px 0;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.read-more-btn:hover {
    border-bottom-color: var(--primary-color);
}

#articleCat {
    font-weight: 500;
    color: var(--primary-color);
}
/* 6. Sidebar Styling */
.categories {
    font-family: var(--font-body);
    color: var(--text-color);
}

.sidebar {
    padding: 24px;
    background: var(--content-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    height: fit-content;
    position: sticky;
    top: 100px;
}

.sidebar h4 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
    margin-bottom: 16px;
    color: var(--primary-color);
    font-size: 1.1em;
    font-weight: 600;
}

.sidebar ul {
    list-style: none;
}

.sidebar ul li {
    margin-bottom: 8px;
}

.sidebar ul li a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
}

.sidebar ul li a:hover {
    color: var(--primary-light);
}

/* 7. Single Post View Adjustments */
.single-post {
    margin-top: 40px;
}

.full-article {
    background: var(--content-bg);
    padding: 40px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.full-article h2 {
    font-size: 2em;
    margin-bottom: 12px;
    color: var(--text-color);
    font-weight: 600;
}

.full-article h3 {
    margin: 28px 0 12px 0;
    font-family: var(--font-heading);
    font-size: 1.4em;
    color: var(--text-color);
    font-weight: 600;
}

.full-article h4 {
    margin: 20px 0 10px 0;
    font-size: 1.15em;
    color: var(--text-color);
    font-weight: 600;
}

.article-body {
    line-height: 1.9;
    font-size: 1.05em;
}

.article-body p {
    margin-bottom: 16px;
    color: var(--text-color);
}

/* Code Formatting */
.article-body pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 16px;
    overflow-x: auto;
    border-radius: 6px;
    margin: 24px 0;
    font-size: 0.95em;
    line-height: 1.5;
}

.post-footer {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.post-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.post-footer a:hover {
    color: var(--primary-light);
}

/* 8. Footer */
.site-footer {
    text-align: center;
    padding: 32px 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    background-color: var(--content-bg);
    font-size: 0.9em;
    margin-top: 60px;
}

.about-author {
    font-family: var(--font-body);
    font-size: 1.05em;
    color: var(--text-color);
    max-width: 600px;
    margin: 0 auto;
    padding: 40px 20px;
}

.about-author h4 {
    font-size: 1.8em;
    margin-bottom: 20px;
    color: var(--text-color);
    font-weight: 600;
}

.about-author p {
    line-height: 1.9;
    margin-bottom: 20px;
    color: var(--text-color);
}

.about-author button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 16px;
}

.about-author button:hover {
    background: var(--primary-light);
    box-shadow: var(--shadow-hover);
}

/* 9. Basic Responsiveness (Crucial for a Real Site) */
@media (max-width: 900px) {
    .header-container {
        padding: 0 16px;
    }

    .site-header nav a {
        margin-left: 16px;
        font-size: 14px;
    }

    .content-container {
        grid-template-columns: 1fr;
        gap: 32px;
        margin: 40px auto;
    }

    .sidebar {
        position: static;
        top: auto;
    }
}

@media (max-width: 640px) {
    .site-header {
        padding: 12px 0;
    }

    .site-header h1 a {
        font-size: 1.1em;
    }

    .site-header nav {
        display: flex;
        flex-direction: row;
        gap: 12px;
    }

    .site-header nav a {
        margin-left: 0;
        font-size: 12px;
        padding: 4px 0;
    }

    .header-container {
        padding: 0 12px;
        gap: 12px;
    }

    .content-container {
        padding: 0 16px;
        gap: 24px;
    }

    .post-list h2 {
        font-size: 1.6em;
        margin-bottom: 24px;
    }

    .blog-post-card {
        padding: 20px;
        margin-bottom: 20px;
    }

    .blog-post-card h3 {
        font-size: 1.2em;
    }

    .full-article {
        padding: 20px;
    }

    .full-article h2 {
        font-size: 1.5em;
    }

    .full-article h3 {
        font-size: 1.2em;
    }

    .article-body {
        font-size: 1em;
    }

    .about-author {
        padding: 20px 16px;
    }

    .about-author h4 {
        font-size: 1.5em;
    }
}