:root {
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    
    /* Color Palette */
    --color-primary: #007bff;      /* A nice, standard blue */
    --color-primary-dark: #0056b3; /* A darker blue for hovers */
    --color-brand-bg: #2c3e50;    /* A deep, dark slate for the header */
    --color-brand-text: #ecf0f1;   /* A soft white for header text */
    --color-text: #333;
    --color-bg: #fff;
    --color-border: #ddd;
    --container-width: 800px;
}

body {
    font-family: var(--font-sans);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    margin: 0;
    padding: 20px;
}

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

h1, h2, h3 {
    line-height: 1.2;
    margin-top: 2rem;
}

h1 {
    font-size: 2.2rem;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

hr {
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: 2rem 0;
}

nav {
    margin-top: 2rem;
    display: flex;
    justify-content: space-between;
}

/* Responsive styles */
@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    .container {
        padding: 10px;
    }
    h1 {
        font-size: 1.8rem;
    }
}

mark {
    background-color: #ffde7d;
    padding: 0.1em 0.2em;
    border-radius: 3px;
}

/* ==========================================================================
   Header and Navigation Styles
   ========================================================================== */

.site-header {
    background-color: var(--color-brand-bg);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    
    /* Extend header outside the main container */
    margin-left: -2rem;
    margin-right: -2rem;
    margin-top: -2rem;
    margin-bottom: 2rem;
}

.site-title a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--color-brand-text);
    text-decoration: none;
}

.site-title a:hover {
    color: var(--color-primary);
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 1.5rem; /* Space between nav items */
}

.main-nav a {
    color: var(--color-brand-text);
    text-decoration: none;
    font-size: 1rem;
}

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

/* ==========================================================================
   Post List Styles
   ========================================================================== */
   
.post-list {
    list-style: none;
    padding: 0;
}

.post-list li {
    margin-bottom: 1rem;
}

.post-list .post-date {
    color: #777;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

/* ==========================================================================
   Pagination Styles
   ========================================================================== */

.pagination {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
}

/* ==========================================================================
   Responsive Header
   ========================================================================== */
   
@media (max-width: 600px) {
    .site-header {
        flex-direction: column;
        gap: 1rem;
        padding: 1.5rem;
        margin-left: -1rem;
        margin-right: -1rem;
        margin-top: -1rem;
    }

    body {
        padding: 1rem;
    }
    
    .container {
        padding: 0;
    }
}

/* ==========================================================================
   Footer Styles (Corrected)
   ========================================================================== */

footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.9em;
    color: #777;
}

.footer-nav {
    /* Override the general 'nav' rule */
    display: block; /* Change from flex to block */
    text-align: center;
    margin-top: 0; /* Reset the top margin */
}

.footer-nav a {
    color: var(--color-text);
    margin: 0 0.5rem;
}

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

/* ==========================================================================
   Content Typography Styles
   ========================================================================== */

.content-area p {
    margin-bottom: 1.5rem;
}

.content-area h2,
.content-area h3 {
    margin-top: 3rem;
    margin-bottom: 1.5rem;
}

.content-area ul,
.content-area ol {
    padding-left: 2rem;
    margin-bottom: 1.5rem;
}

.content-area li {
    margin-bottom: 0.5rem;
}

.content-area blockquote {
    margin-left: 0;
    padding-left: 1.5rem;
    border-left: 4px solid var(--color-border);
    font-style: italic;
    color: #555;
}

.content-area code {
    font-family: var(--font-mono);
    background-color: #f4f4f4;
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
}

.content-area pre {
    background-color: #f4f4f4;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 1rem;
    overflow-x: auto; /* Allow horizontal scrolling for long code lines */
}

.content-area pre code {
    background-color: transparent;
    padding: 0;
}

/* ==========================================================================
   Mermaid Diagram Styles
   ========================================================================== */

.mermaid {
    text-align: center;
}

.mermaid svg {
    max-width: 100%; /* Never allow the SVG to be wider than its container */
    height: auto;    /* Scale the height automatically to maintain aspect ratio */
}