:root {
    --bg: #ffffff;
    --fg: #000000;
    --border: #e5e5e5;
    --muted: #666666;
    --accent: #000000;
}

/* Load Google Fonts: Inter (main text) and Roboto Mono (monospace) */
/* @import url('https://fonts.googleapis.com/css2?family=Inter:wght@100..900&family=Roboto+Mono:wght@400;700&display=swap'); */

html {
    scroll-behavior: smooth;
}

body {
    /* Prioritize Inter, falling back to system sans-serif fonts */
    font-family: 'Inter', sans-serif; 
     /* -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', */
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    margin-top: 40px;
    font-size: 16px;
}

.mono {
    /* Prioritize Roboto Mono, falling back to system monospace fonts */
    font-family: 'Roboto Mono',  monospace;
    /* 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Courier New', */
    font-size: 0.9em;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.nav-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: max-width 0.3s ease, padding 0.3s ease;
}

/* Wide nav for blog posts */
nav.wide .nav-content {
    max-width: 1200px;
    padding: 16px 60px;
}

.nav-logo {
    font-weight: 600;
    font-size: 1.1rem;
    transition: opacity 0.2s ease;
}

.nav-logo:hover {
    opacity: 0.6;
    cursor: pointer;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: var(--fg);
    text-decoration: none;
    transition: opacity 0.3s ease, transform 0.2s ease;
    display: inline-block;
}

.nav-links a:hover {
    opacity: 0.6;
    transform: translateY(-1px);
}

/* Container */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 100px 24px 60px;
    animation: fadeIn 0.6s ease-out;
}

/* Blog Layout with TOC */
.blog-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 60px 60px;
    display: grid;
    grid-template-columns: 1fr 250px;
    gap: 80px;
    animation: fadeIn 0.6s ease-out;
}

.blog-content {
    min-width: 0;
}

#blog-content .katex-display {
    overflow-x: auto;
    overflow-y: hidden;
    padding: 1rem 0;
}

#blog-content .katex {
    font-size: 1em;
}

/* For mobile */
@media (max-width: 768px) {
    #blog-content .katex-display {
        font-size: 0.9em;
    }
}

/* Header */
header {
    margin-bottom: 80px;
    animation: fadeIn 0.6s ease-out;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
    transition: color 0.3s ease;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 32px;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: color 0.3s ease;
}

h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    font-weight: 600;
    transition: color 0.3s ease;
}

.tagline {
    font-size: 1.1rem;
    color: var(--muted);
    margin-bottom: 8px;
}

.links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.links a {
    color: var(--fg);
    text-decoration: none;
    border-bottom: 1px solid var(--fg);
    transition: opacity 0.3s ease, border-color 0.3s ease;
    padding-bottom: 1px;
}

.links a:hover {
    opacity: 0.6;
    border-color: var(--muted);
}

/* Sections */
section {
    margin-bottom: 80px;
    animation: fadeIn 0.8s ease-out;
    animation-fill-mode: both;
}

section:nth-child(2) {
    animation-delay: 0.1s;
}

section:nth-child(3) {
    animation-delay: 0.2s;
}

section:nth-child(4) {
    animation-delay: 0.3s;
}

/* Cards */
.featured-card {
    padding: 32px;
    border: 2px solid var(--fg);
    border-radius: 8px;
    margin-bottom: 24px;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    background: var(--bg);
}

.featured-card:hover {
    box-shadow: 8px 8px 0 var(--fg);
    transform: translate(-4px, -4px);
}

.featured-label {
    display: inline-block;
    padding: 4px 12px;
    background: var(--fg);
    color: var(--bg);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    font-weight: 600;
}

.card-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.card-meta {
    color: var(--muted);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.card-description {
    margin-bottom: 16px;
    line-height: 1.7;
}

.card-link {
    color: var(--fg);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 2px solid var(--fg);
    padding-bottom: 2px;
    display: inline-block;
    transition: opacity 0.3s ease, transform 0.2s ease;
}

.card-link:hover {
    opacity: 0.6;
    transform: translateX(4px);
}

/* Posts Grid */
.posts-grid {
    display: grid;
    gap: 24px;
}

.post-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-decoration: none;
    color: inherit;
    display: block;
}

.post-card:hover {
    border-color: var(--fg);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transform: translateY(-4px);
}

.post-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.post-excerpt {
    color: var(--muted);
    margin-bottom: 12px;
    line-height: 1.6;
}

.post-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.tag {
    padding: 4px 10px;
    background: #f5f5f5;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--muted);
}

/* Resume specific */
.about-content {
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-content p {
    margin-bottom: 16px;
}

.about-snippet {
    padding: 32px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fafafa;
}

.about-snippet p {
    margin-bottom: 16px;
    line-height: 1.7;
}

.highlight {
    background: #f0f0f0;
    padding: 2px 6px;
    border-radius: 3px;
}

.item {
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border);
}

.item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.item-header {
    margin-bottom: 12px;
}

.item-meta {
    color: var(--muted);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.item-description {
    margin-top: 8px;
    color: var(--fg);
}

ul {
    list-style: none;
    padding-left: 0;
}

li {
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--muted);
}

/* Skills */
.skills-section {
    display: grid;
    gap: 32px;
}

.skill-category {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all 0.3s;
}

.skill-category:hover {
    border-color: var(--fg);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.skill-category h3 {
    margin-bottom: 16px;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.skills {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-tag {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.85rem;
    background: var(--bg);
    transition: all 0.2s;
}

.skill-tag:hover {
    border-color: var(--fg);
    background: #fafafa;
}

/* Education */
.education-grid {
    display: grid;
    gap: 24px;
}

.edu-item {
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all 0.3s;
}

.edu-item:hover {
    border-color: var(--fg);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

/* Blog CTA */
.blog-cta {
    padding: 32px;
    border: 1px solid var(--border);
    border-radius: 6px;
    text-align: center;
    transition: all 0.3s;
}

.blog-cta:hover {
    border-color: var(--fg);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.blog-cta a {
    color: var(--fg);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
    border-bottom: 2px solid var(--fg);
    padding-bottom: 2px;
}

/* CTA Button */
.cta-button {
    display: inline-block;
    padding: 12px 24px;
    background: var(--fg);
    color: var(--bg);
    text-decoration: none;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.3s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

/* Table of Contents */
.toc-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    padding-left: 24px;
    border-left: 2px solid var(--border);
    transition: border-color 0.3s ease;
}

.toc-sidebar:hover {
    border-color: var(--fg);
}

.toc-title {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
    color: var(--muted);
}

.toc-list {
    list-style: none;
    padding: 0;
}

.toc-list li {
    padding: 0;
    margin-bottom: 8px;
}

.toc-list li:before {
    content: none;
}

.toc-list a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease, transform 0.2s ease, padding-left 0.3s ease;
    display: block;
    padding: 4px 0 4px 12px;
    border-left: 2px solid transparent;
    margin-left: -14px;
}

.toc-list a:hover {
    color: var(--fg);
    padding-left: 16px;
    border-left-color: var(--fg);
}

.toc-list a.active {
    color: var(--fg);
    border-left-color: var(--fg);
    font-weight: 500;
}

.toc-list .toc-h3 {
    padding-left: 28px;
    font-size: 0.85rem;
}

.toc-list .toc-h3:hover {
    padding-left: 32px;
}

/* Blog Post Styling */
.blog-post {
    line-height: 1.8;
}

.blog-post h1 {
    margin-top: 48px;
    margin-bottom: 24px;
}

.blog-post h2 {
    margin-top: 48px;
    margin-bottom: 24px;
    font-size: 1.8rem;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.blog-post h3 {
    margin-top: 36px;
    margin-bottom: 16px;
    font-size: 1.3rem;
}

.blog-post p {
    margin-bottom: 24px;
    transition: opacity 0.3s ease;
}

.blog-post img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 40px auto;
    /* box-shadow: 0 4px 20px rgba(0,0,0,0.08); */
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: block;
}

.blog-post img:hover {
    transform: scale(1.02);
    /* box-shadow: 0 8px 30px rgba(0,0,0,0.12); */
}

.blog-post pre {
    background: #f5f5f5;
    padding: 24px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 32px 0;
    border: 1px solid var(--border);
    transition: border-color 0.3s ease;
}

.blog-post pre:hover {
    border-color: var(--muted);
}
.blog-post pre code,
.blog-post code[class*="language-"] {
    font-family: 'Roboto Mono', monospace !important;
    font-size: 0.8rem !important;
}

.code-language-label {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.7rem;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

pre[class*="language-"] {
    padding-top: 2.5rem !important;
}

.blog-post p code {
    font-family: 'Roboto Mono', monospace !important;
    font-size: 0.8rem !important;
    background: #f5f5f5;
    padding: 3px 8px;
    border-radius: 4px;
    border: 1px solid var(--border);
    transition: background 0.2s ease;
}

.blog-post p code:hover {
    background: #ebebeb;
}

.blog-post blockquote {
    border-left: 4px solid var(--fg);
    padding-left: 24px;
    margin: 32px 0;
    color: var(--muted);
    font-style: italic;
    background: #fafafa;
    padding: 20px 24px 0.5px;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.blog-post blockquote:hover {
    background: #f5f5f5;
}

.blog-post ul,
.blog-post ol {
    margin-bottom: 24px;
    padding-left: 28px;
}

.blog-post ul {
    list-style: disc;
}

.blog-post ol {
    list-style: decimal;
}

.blog-post li {
    margin-bottom: 12px;
    line-height: 1.7;
}

.blog-post li:before {
    content: none;
}

.blog-post a {
    color: var(--fg);
    text-decoration: none;
    border-bottom: 1px solid var(--muted);
    transition: border-color 0.3s ease, opacity 0.3s ease;
}

.blog-post a:hover {
    opacity: 0.6;
    border-bottom-color: var(--fg);
}

/* Footer */
footer {
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
}

/* Scroll to top */
.scroll-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--fg);
    color: var(--bg);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.scroll-top:hover {
    transform: scale(1.15) rotate(5deg);
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 1024px) {
    .blog-container {
        grid-template-columns: 1fr;
        padding: 100px 40px 60px;
        gap: 40px;
    }
    
    .toc-sidebar {
        display: none;
    }
    
    nav.wide .nav-content {
        max-width: 720px;
        padding: 16px 40px;
    }
}

@media (max-width: 640px) {
    h1 {
        font-size: 2rem;
    }
    
    .container,
    .blog-container {
        padding: 80px 20px 40px;
    }
    
    .nav-content,
    nav.wide .nav-content {
        padding: 16px 20px;
    }
    
    .nav-links {
        gap: 16px;
    }
    
    .blog-post h2 {
        font-size: 1.5rem;
    }
    
    .blog-post h3 {
        font-size: 1.2rem;
    }
}