/* ============================================
   Personal Site — Clean, light, content-first
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   Custom Properties
   ============================================ */
:root {
    --bg: #faf9f6;
    --bg-code: #f3f1ed;
    --text: #2c2c2c;
    --text-secondary: #666;
    --text-muted: #999;
    --accent: #1a56db;
    --accent-hover: #1042a8;
    --border: #e5e3df;
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --content-width: 660px;
    --nav-height: 56px;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

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

img {
    max-width: 100%;
    height: auto;
}

/* ============================================
   Skip Link (a11y)
   ============================================ */
.skip-to-content {
    position: absolute;
    top: -100%;
    left: 16px;
    padding: 8px 16px;
    background: var(--text);
    color: var(--bg);
    z-index: 1000;
    font-size: 0.875rem;
    border-radius: 4px;
    text-decoration: none;
}

.skip-to-content:focus {
    top: 8px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    height: var(--nav-height);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-name {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1rem;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.site-name:hover {
    color: var(--text);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 24px;
}

.nav-links a {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
}

/* Hamburger */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    flex-direction: column;
    gap: 5px;
}

.hamburger-bar {
    width: 20px;
    height: 2px;
    background: var(--text);
    transition: transform 0.2s;
}

.hamburger.active .hamburger-bar:nth-child(1) {
    transform: rotate(45deg) translate(3px, 4px);
}
.hamburger.active .hamburger-bar:nth-child(2) {
    opacity: 0;
}
.hamburger.active .hamburger-bar:nth-child(3) {
    transform: rotate(-45deg) translate(3px, -4px);
}

/* Mobile menu */
.mobile-menu {
    display: none;
    position: fixed;
    inset: var(--nav-height) 0 0 0;
    background: var(--bg);
    z-index: 100;
    padding: 32px 24px;
}

.mobile-menu.active {
    display: block;
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mobile-nav-links a {
    font-size: 1.125rem;
    color: var(--text);
    text-decoration: none;
}

@media (max-width: 640px) {
    .nav-links { display: none; }
    .hamburger { display: flex; }
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
    flex: 1;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 48px 24px 80px;
    width: 100%;
}

/* ============================================
   Homepage
   ============================================ */
.intro {
    margin-bottom: 48px;
}

.intro p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text);
}

.intro p + p {
    margin-top: 12px;
}

.post-list {
    list-style: none;
}

.post-item {
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.post-item:first-child {
    border-top: 1px solid var(--border);
}

.post-title {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
}

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

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

.post-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.post-summary {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 4px;
    line-height: 1.5;
}

.view-all-posts {
    margin-top: 32px;
}

.view-all-link {
    font-size: 0.9rem;
}

/* Pagination */
.pagination {
    margin-top: 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.9rem;
}

.pagination-info {
    color: var(--text-muted);
}

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

/* ============================================
   Article (Blog Post)
   ============================================ */
.article-container,
.page-container {
    max-width: 100%;
}

.article-title,
.page-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.article-category {
    margin-left: 8px;
    padding: 2px 8px;
    background: var(--bg-code);
    border-radius: 3px;
    font-size: 0.75rem;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 32px;
}

.tag {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 2px 8px;
    border: 1px solid var(--border);
    border-radius: 3px;
}

.tag:hover {
    color: var(--text);
    border-color: var(--text-muted);
}

/* Article/Page body content */
.article-content,
.page-content {
    line-height: 1.7;
}

.article-content h2,
.page-content h2 {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.article-content h3,
.page-content h3 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 8px;
}

.article-content p,
.page-content p {
    margin-bottom: 16px;
}

.article-content ul,
.article-content ol,
.page-content ul,
.page-content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.article-content li,
.page-content li {
    margin-bottom: 4px;
}

.article-content blockquote,
.page-content blockquote {
    border-left: 3px solid var(--border);
    padding-left: 16px;
    color: var(--text-secondary);
    margin: 24px 0;
    font-style: italic;
}

.article-content code,
.page-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--bg-code);
    padding: 2px 5px;
    border-radius: 3px;
}

.article-content pre,
.page-content pre {
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
    margin: 24px 0;
    font-size: 0.85rem;
    line-height: 1.5;
}

.article-content pre code,
.page-content pre code {
    background: none;
    padding: 0;
}

.article-content table,
.page-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.9rem;
}

.article-content th,
.article-content td,
.page-content th,
.page-content td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.article-content th,
.page-content th {
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-secondary);
}

.article-content hr,
.page-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 40px 0;
}

.article-content img,
.page-content img {
    border-radius: 6px;
    margin: 24px 0;
}

/* Article footer */
.article-footer {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.back-link {
    font-size: 0.9rem;
}

/* ============================================
   Page-specific: Callout
   ============================================ */
.callout {
    background: var(--bg-code);
    border-left: 3px solid var(--accent);
    padding: 12px 16px;
    margin: 20px 0;
    font-size: 0.95rem;
    border-radius: 0 4px 4px 0;
}

/* ============================================
   Page-specific: Research cards
   ============================================ */
.research-card {
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
}

.research-card:first-of-type {
    border-top: 1px solid var(--border);
}

.research-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.research-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.research-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.paper-tag {
    font-size: 0.7rem;
    color: var(--text-muted);
    padding: 2px 6px;
    border: 1px solid var(--border);
    border-radius: 3px;
}

/* ============================================
   Page-specific: Tech badges
   ============================================ */
.tech-badge {
    display: inline-block;
    font-size: 0.8rem;
    padding: 2px 8px;
    background: var(--bg-code);
    border-radius: 3px;
    margin: 2px;
}

/* ============================================
   Page-specific: Quick facts, stats bar
   ============================================ */
.quick-facts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    margin: 24px 0;
}

.fact {
    font-size: 0.9rem;
}

.fact strong {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 2px;
}

.stats-bar {
    display: flex;
    gap: 32px;
    margin: 24px 0;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* ============================================
   Page-specific: CTA (simplified)
   ============================================ */
.page-cta {
    margin: 32px 0;
    padding: 24px;
    background: var(--bg-code);
    border-radius: 6px;
}

.page-cta h3 {
    font-size: 1rem;
    margin-bottom: 4px;
}

.page-cta p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.btn-primary,
.btn-secondary {
    display: inline-block;
    font-size: 0.85rem;
    padding: 8px 16px;
    border-radius: 4px;
    text-decoration: none;
    margin-right: 8px;
}

.btn-primary {
    background: var(--text);
    color: var(--bg);
}

.btn-primary:hover {
    background: #444;
    color: var(--bg);
}

.btn-secondary {
    background: none;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--text-muted);
}

/* ============================================
   Page-specific: Resume actions
   ============================================ */
.resume-actions {
    margin: 16px 0 24px;
}

/* ============================================
   Archives
   ============================================ */
.archives-list {
    list-style: none;
}

.archives-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
}

.archives-list a {
    color: var(--text);
    text-decoration: none;
}

.archives-list a:hover {
    color: var(--accent);
}

.archives-list time {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* ============================================
   Tags page
   ============================================ */
.tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 24px 0;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding: 24px 0;
}

.footer-container {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-social {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.footer-social a {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-decoration: none;
}

.footer-social a:hover {
    color: var(--text);
}

.footer-copyright {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ============================================
   Syntax Highlighting (Pygments — light)
   ============================================ */
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #6a737d } /* Comment */
.highlight .k { color: #d73a49 } /* Keyword */
.highlight .o { color: #d73a49 } /* Operator */
.highlight .cm { color: #6a737d } /* Comment.Multiline */
.highlight .cp { color: #d73a49 } /* Comment.Preproc */
.highlight .c1 { color: #6a737d } /* Comment.Single */
.highlight .cs { color: #6a737d } /* Comment.Special */
.highlight .gd { color: #cb2431 } /* Generic.Deleted */
.highlight .gi { color: #22863a } /* Generic.Inserted */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #6f42c1 } /* Generic.Subheading */
.highlight .kc { color: #005cc5 } /* Keyword.Constant */
.highlight .kd { color: #d73a49 } /* Keyword.Declaration */
.highlight .kn { color: #d73a49 } /* Keyword.Namespace */
.highlight .kp { color: #d73a49 } /* Keyword.Pseudo */
.highlight .kr { color: #d73a49 } /* Keyword.Reserved */
.highlight .kt { color: #6f42c1 } /* Keyword.Type */
.highlight .m { color: #005cc5 } /* Literal.Number */
.highlight .s { color: #032f62 } /* Literal.String */
.highlight .na { color: #6f42c1 } /* Name.Attribute */
.highlight .nb { color: #005cc5 } /* Name.Builtin */
.highlight .nc { color: #6f42c1 } /* Name.Class */
.highlight .no { color: #005cc5 } /* Name.Constant */
.highlight .nd { color: #6f42c1 } /* Name.Decorator */
.highlight .nf { color: #6f42c1 } /* Name.Function */
.highlight .nn { color: #005cc5 } /* Name.Namespace */
.highlight .nt { color: #22863a } /* Name.Tag */
.highlight .nv { color: #e36209 } /* Name.Variable */
.highlight .ow { color: #d73a49 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mf { color: #005cc5 } /* Literal.Number.Float */
.highlight .mh { color: #005cc5 } /* Literal.Number.Hex */
.highlight .mi { color: #005cc5 } /* Literal.Number.Integer */
.highlight .mo { color: #005cc5 } /* Literal.Number.Oct */
.highlight .sb { color: #032f62 } /* Literal.String.Backtick */
.highlight .sc { color: #032f62 } /* Literal.String.Char */
.highlight .sd { color: #032f62 } /* Literal.String.Doc */
.highlight .s2 { color: #032f62 } /* Literal.String.Double */
.highlight .se { color: #032f62 } /* Literal.String.Escape */
.highlight .sh { color: #032f62 } /* Literal.String.Heredoc */
.highlight .si { color: #032f62 } /* Literal.String.Interpol */
.highlight .sx { color: #032f62 } /* Literal.String.Other */
.highlight .sr { color: #032f62 } /* Literal.String.Regex */
.highlight .s1 { color: #032f62 } /* Literal.String.Single */
.highlight .ss { color: #032f62 } /* Literal.String.Symbol */
.highlight .il { color: #005cc5 } /* Literal.Number.Integer.Long */

/* ============================================
   Print
   ============================================ */
@media print {
    .navbar, .footer, .hamburger, .mobile-menu { display: none; }
    body { background: white; color: black; }
    a { color: black; text-decoration: underline; }
}