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

:root {
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;

    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-link: #1a1a1a;
    --color-link-hover: #555555;
    --color-border: #e5e5e5;
    --color-nav-active: #f5f5f5;

    --sidebar-width: 240px;
    --content-max-width: 720px;
    --spacing-unit: 1rem;
}

html {
    font-size: 16px;
    line-height: 1.6;
}

body {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    padding: calc(var(--spacing-unit) * 2);
    border-right: 1px solid var(--color-border);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

/* Profile section */
.profile {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.profile-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.profile-title {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Navigation */
.nav {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.nav ul {
    list-style: none;
}

.nav li {
    margin-bottom: 0.5rem;
}

.nav-link {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--color-text);
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.15s ease;
}

.nav-link:hover,
.nav-link.active {
    background-color: var(--color-nav-active);
}

/* Social links */
.social {
    margin-top: auto;
}

.social-heading {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.social ul {
    list-style: none;
}

.social li {
    margin-bottom: 0.5rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--color-text);
    text-decoration: none;
    padding: 0.25rem 0;
}

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

.external-icon {
    font-size: 0.75rem;
    opacity: 0.5;
}

/* Main content */
.main {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: calc(var(--spacing-unit) * 3);
    max-width: calc(var(--content-max-width) + var(--sidebar-width) + var(--spacing-unit) * 6);
}

/* Intro section */
.intro {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.intro h2 {
    font-size: 1.5rem;
    font-weight: 500;
    line-height: 1.4;
}

.intro a {
    color: var(--color-text);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* Articles section */
.articles h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

/* Articles table */
.articles-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.articles-table th {
    text-align: left;
    font-weight: 400;
    color: var(--color-text-secondary);
    padding: 0.5rem 1rem 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
}

.articles-table td {
    padding: 0.75rem 1rem 0.75rem 0;
    vertical-align: top;
}

.col-year {
    width: 60px;
    color: var(--color-text-secondary);
}

.col-date {
    width: 60px;
    color: var(--color-text-secondary);
}

.col-title a {
    color: var(--color-text);
    text-decoration: none;
}

.col-title a:hover {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.no-articles {
    color: var(--color-text-secondary);
    font-style: italic;
}

/* Article page */
.article {
    max-width: var(--content-max-width);
}

.article-header {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.article-title {
    font-size: 1.75rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.5rem;
}

.article-date {
    display: block;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.article-tags {
    margin-top: 0.75rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background-color: var(--color-nav-active);
    border-radius: 4px;
}

/* Article content */
.article-content {
    line-height: 1.7;
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
    margin-top: calc(var(--spacing-unit) * 2);
    margin-bottom: var(--spacing-unit);
    font-weight: 600;
}

.article-content h2 {
    font-size: 1.375rem;
}

.article-content h3 {
    font-size: 1.125rem;
}

.article-content p {
    margin-bottom: var(--spacing-unit);
}

.article-content a {
    color: var(--color-text);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.article-content ul,
.article-content ol {
    margin-bottom: var(--spacing-unit);
    padding-left: 1.5rem;
}

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

.article-content pre {
    background-color: #f8f8f8;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: var(--spacing-unit);
    overflow-x: auto;
    margin-bottom: var(--spacing-unit);
    font-size: 0.875rem;
}

.article-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
}

.article-content p code,
.article-content li code {
    background-color: #f8f8f8;
    padding: 0.125rem 0.375rem;
    border-radius: 3px;
}

.article-content blockquote {
    border-left: 3px solid var(--color-border);
    padding-left: var(--spacing-unit);
    margin-bottom: var(--spacing-unit);
    color: var(--color-text-secondary);
    font-style: italic;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: calc(var(--spacing-unit) * 2) 0;
}

/* Article footer */
.article-footer {
    margin-top: calc(var(--spacing-unit) * 3);
    padding-top: calc(var(--spacing-unit) * 2);
    border-top: 1px solid var(--color-border);
}

.back-link {
    color: var(--color-text-secondary);
    text-decoration: none;
}

.back-link:hover {
    color: var(--color-text);
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-unit);
    }

    .nav ul {
        display: flex;
        gap: 0.5rem;
    }

    .social {
        display: none;
    }

    .main {
        margin-left: 0;
        padding: var(--spacing-unit);
    }

    .articles-table {
        font-size: 0.875rem;
    }

    .col-year,
    .col-date {
        width: auto;
    }

    .article-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .articles-table th,
    .articles-table td {
        padding: 0.5rem 0.5rem 0.5rem 0;
    }

    .col-year {
        display: none;
    }
}