/* CSS Variables for theming */
:root {
    --bg-color: #ffffff;
    --text-color: rgba(0, 0, 0, 0.85);
    --text-muted: rgba(0, 0, 0, 0.55);
    --border-color: #e0e0e0;
    --border-hover: #333333;
    --accent-color: #4a9f6e;
    --accent-hover: #3d8a5c;
    --code-bg: #f6f8fa;
    --code-border: #e1e4e8;
    --inline-code-bg: rgba(0, 0, 0, 0.06);
    --line-number-color: rgba(0, 0, 0, 0.3);
    --line-number-border: rgba(0, 0, 0, 0.1);
    --toggle-bg: transparent;
    --toggle-hover: rgba(0, 0, 0, 0.08);
    --toggle-color: rgba(0, 0, 0, 0.5);
    --copy-btn-bg: rgba(0, 0, 0, 0.05);
    --copy-btn-hover: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #1c1c1c;
    --text-color: rgba(255, 255, 255, 0.9);
    --text-muted: rgba(255, 255, 255, 0.5);
    --border-color: #333333;
    --border-hover: #888888;
    --accent-color: #6abf8a;
    --accent-hover: #8ad4a6;
    --code-bg: #1e1e1e;
    --code-border: #333333;
    --inline-code-bg: rgba(255, 255, 255, 0.1);
    --line-number-color: rgba(255, 255, 255, 0.25);
    --line-number-border: rgba(255, 255, 255, 0.1);
    --toggle-bg: transparent;
    --toggle-hover: rgba(255, 255, 255, 0.1);
    --toggle-color: rgba(255, 255, 255, 0.5);
    --copy-btn-bg: rgba(255, 255, 255, 0.05);
    --copy-btn-hover: rgba(255, 255, 255, 0.1);
}

/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 18px;
    scroll-behavior: smooth;
}

@media (min-width: 768px) {
    html {
        font-size: 20px;
    }
}

body {
    font-family: Charter, 'Bitstream Charter', 'Sitka Text', Cambria, Georgia, serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* Container */
.container {
    max-width: 750px;
    margin: 0 auto;
    padding: 0 24px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Site header */
.site-header {
    padding: 60px 0 40px;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.site-name {
    font-size: 1.5rem;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.social-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.15s ease;
}

.social-link:hover {
    color: var(--accent-color);
}

/* Tagline */
.site-tagline {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
    max-width: 500px;
}

/* Theme toggle button */
.theme-toggle {
    background: var(--toggle-bg);
    border: none;
    border-radius: 6px;
    width: 34px;
    height: 34px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--toggle-color);
    transition: background-color 0.15s ease, color 0.15s ease;
}

.theme-toggle:hover {
    background: var(--toggle-hover);
    color: var(--text-color);
}

.icon-sun {
    display: none;
}

.icon-moon {
    display: block;
}

[data-theme="dark"] .icon-sun {
    display: block;
}

[data-theme="dark"] .icon-moon {
    display: none;
}

/* Main content */
main {
    flex: 1;
}

/* Posts list on homepage */
.posts-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.post-preview {
    border-left: 4px solid var(--border-color);
    margin-left: -24px;
    transition: border-color 0.15s ease;
}

.post-preview:hover {
    border-left-color: var(--accent-color);
}

.post-preview a {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
    padding: 12px 0 12px 20px;
    text-decoration: none;
    color: inherit;
}

.post-preview .post-title {
    font-size: 1rem;
    color: var(--text-color);
}

.post-preview time {
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Monaco, Consolas, monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* Article/Blog post page */
article.post {
    padding: 20px 0;
}

article.post .post-header {
    text-align: center;
    margin-bottom: 40px;
}

article.post .post-header h1 {
    font-size: 1.6rem;
    font-weight: 400;
    margin-bottom: 16px;
    line-height: 1.3;
}

article.post .post-header time {
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Monaco, Consolas, monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
}

article.post .post-content {
    text-align: left;
}

article.post .post-content p {
    margin-bottom: 1.4em;
}

article.post .post-content h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 2em;
    margin-bottom: 0.8em;
}

article.post .post-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 1.5em;
    margin-bottom: 0.6em;
}

article.post .post-content a {
    color: var(--accent-color);
    text-decoration: none;
}

article.post .post-content a:hover {
    text-decoration: underline;
}

article.post .post-content ul,
article.post .post-content ol {
    margin-bottom: 1.4em;
    padding-left: 1.5em;
}

article.post .post-content li {
    margin-bottom: 0.5em;
}

/* Images in posts */
article.post .post-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 2em auto;
    border-radius: 4px;
}

article.post .post-content figure {
    margin: 2em 0;
}

article.post .post-content figure img {
    margin: 0 auto 0.8em;
}

article.post .post-content figcaption {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Inline code */
code {
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Monaco, Consolas, monospace;
    font-size: 0.85em;
    background: var(--inline-code-bg);
    padding: 0.15em 0.4em;
    border-radius: 3px;
}

/* Code blocks with line numbers */
.code-block {
    position: relative;
    margin: 1.5em 0;
}

.code-block pre {
    margin: 0;
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 6px;
    padding: 0;
    overflow: hidden;
}

.code-block .code-content {
    display: flex;
    overflow-x: auto;
}

.code-block .line-numbers {
    flex-shrink: 0;
    padding: 16px 0;
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--line-number-border);
    background: var(--code-bg);
}

.code-block .line-numbers span {
    display: block;
    padding: 0 12px;
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Monaco, Consolas, monospace;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--line-number-color);
}

.code-block code {
    display: block;
    padding: 16px 16px 16px 16px;
    background: none;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-color);
    white-space: pre;
    flex: 1;
}

/* Copy button */
.code-block .copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 6px 10px;
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Monaco, Consolas, monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
    background: var(--copy-btn-bg);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.code-block:hover .copy-btn {
    opacity: 1;
}

.code-block .copy-btn:hover {
    background: var(--copy-btn-hover);
    color: var(--text-color);
}

.code-block .copy-btn.copied {
    color: var(--accent-color);
}

/* Fallback for pre without wrapper */
pre {
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    border-radius: 6px;
    padding: 16px 20px;
    overflow-x: auto;
    margin: 1.5em 0;
    line-height: 1.5;
}

pre code {
    background: none;
    padding: 0;
    font-size: 0.8rem;
    color: var(--text-color);
}

/* Syntax highlighting - highlight.js classes */
.hljs-comment,
.hljs-quote {
    color: #6a737d;
    font-style: italic;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-type {
    color: #d73a49;
}

.hljs-string,
.hljs-attr,
.hljs-symbol,
.hljs-bullet,
.hljs-addition {
    color: #22863a;
}

.hljs-number,
.hljs-literal {
    color: #005cc5;
}

.hljs-title,
.hljs-section,
.hljs-built_in,
.hljs-function .hljs-title {
    color: #6f42c1;
}

.hljs-meta,
.hljs-meta .hljs-keyword,
.hljs-meta .hljs-string {
    color: #005cc5;
}

.hljs-deletion {
    color: #d73a49;
}

.hljs-variable,
.hljs-template-variable {
    color: #e36209;
}

/* Dark mode syntax highlighting */
[data-theme="dark"] .hljs-comment,
[data-theme="dark"] .hljs-quote {
    color: #8b949e;
}

[data-theme="dark"] .hljs-keyword,
[data-theme="dark"] .hljs-selector-tag,
[data-theme="dark"] .hljs-type {
    color: #ff7b72;
}

[data-theme="dark"] .hljs-string,
[data-theme="dark"] .hljs-attr,
[data-theme="dark"] .hljs-symbol,
[data-theme="dark"] .hljs-bullet,
[data-theme="dark"] .hljs-addition {
    color: #a5d6ff;
}

[data-theme="dark"] .hljs-number,
[data-theme="dark"] .hljs-literal {
    color: #79c0ff;
}

[data-theme="dark"] .hljs-title,
[data-theme="dark"] .hljs-section,
[data-theme="dark"] .hljs-built_in,
[data-theme="dark"] .hljs-function .hljs-title {
    color: #d2a8ff;
}

[data-theme="dark"] .hljs-meta,
[data-theme="dark"] .hljs-meta .hljs-keyword,
[data-theme="dark"] .hljs-meta .hljs-string {
    color: #79c0ff;
}

[data-theme="dark"] .hljs-deletion {
    color: #ff7b72;
}

[data-theme="dark"] .hljs-variable,
[data-theme="dark"] .hljs-template-variable {
    color: #ffa657;
}

/* Legacy manual classes (for hand-written HTML posts) */
.code-comment { color: #6a737d; }
.code-keyword { color: #d73a49; }
.code-string { color: #22863a; }
.code-number { color: #005cc5; }
.code-function { color: #6f42c1; }
.code-operator { color: #d73a49; }

[data-theme="dark"] .code-comment { color: #8b949e; }
[data-theme="dark"] .code-keyword { color: #ff7b72; }
[data-theme="dark"] .code-string { color: #a5d6ff; }
[data-theme="dark"] .code-number { color: #79c0ff; }
[data-theme="dark"] .code-function { color: #d2a8ff; }
[data-theme="dark"] .code-operator { color: #ff7b72; }

/* Blockquotes with accent */
blockquote {
    border-left: 3px solid var(--accent-color);
    margin: 1.5em 0;
    padding: 0 0 0 1.5em;
    color: var(--text-muted);
    font-style: italic;
}

blockquote p {
    margin: 0;
}

/* Horizontal rule */
hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2em 0;
}

/* Post navigation - compact section with prev/home/next */
.post-nav {
    margin-top: 0;
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.post-nav-links {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.post-nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.15s ease;
}

.post-nav a:hover {
    color: var(--accent-color);
}

.post-nav .nav-prev,
.post-nav .nav-next {
    flex: 1;
}

.post-nav .nav-prev {
    text-align: left;
}

.post-nav .nav-prev::before {
    content: '\2190 ';
}

.post-nav .nav-next {
    text-align: right;
}

.post-nav .nav-next::after {
    content: ' \2192';
}

.post-nav .nav-home {
    flex: 1;
    text-align: center;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

/* Footer */
footer {
    padding: 40px 0;
    margin-top: 0;
    border-top: 1px solid var(--border-color);
}

footer p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Selection highlight with accent */
::selection {
    background: rgba(74, 159, 110, 0.2);
}

[data-theme="dark"] ::selection {
    background: rgba(106, 191, 138, 0.3);
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .site-header {
        padding: 40px 0 30px;
    }

    .header-top {
        flex-wrap: wrap;
        gap: 12px;
    }

    .post-preview {
        margin-left: -16px;
    }

    .post-preview a {
        flex-direction: column;
        gap: 4px;
        padding-left: 12px;
    }

    article.post .post-header h1 {
        font-size: 1.4rem;
    }

    .code-block pre,
    pre {
        border-radius: 0;
        border-left: none;
        border-right: none;
        margin-left: -24px;
        margin-right: -24px;
    }

    .code-block .copy-btn {
        opacity: 1;
    }
}