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

:root {
  --bg: #ffffff;
  --bg-secondary: #f7f7f7;
  --text: #1a1a1a;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border: #e0e0e0;
  --accent: #f28482;
  --accent-bg: #f28482;
  --link: #1a1a1a;
  --link-hover: #f28482;
  --nav-bg: #1a1a1a;
  --nav-text: #ffffff;
  --doodle-color: #973938;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Courier New', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Georgia', 'Times New Roman', serif;
  --max-width: 1200px;
  --content-width: 720px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--link);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

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

/* =========================================
   TOP NAVIGATION
   ========================================= */
.top-nav {
  background: var(--nav-bg);
  color: var(--nav-text);
  padding: 0 2rem;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-left a,
.nav-right a {
  color: var(--nav-text);
  text-transform: uppercase;
  padding: 0.25rem 0.5rem;
  border-radius: 3px;
  transition: background 0.15s ease, color 0.15s ease;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.nav-left a:hover,
.nav-right a:hover {
  background: rgba(255, 255, 255, 0.12);
}

.nav-left a.active {
  background: rgba(255, 255, 255, 0.15);
  font-weight: 600;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-weight: 700;
  font-size: 0.8rem;
  margin-right: 0.5rem;
}

.nav-logo .dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
}

.nav-right {
  display: flex;
  align-items: center;
}

/* =========================================
   HOMEPAGE LAYOUT
   ========================================= */
.page-header {
  padding: 3rem 2rem 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: 4.5rem;
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1;
}

.page-header .post-count {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  vertical-align: super;
  margin-left: 0.25rem;
}

.home-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  padding: 1.5rem 2rem 4rem;
}

/* =========================================
   SIDEBAR FILTERS
   ========================================= */
.sidebar {
  position: sticky;
  top: 60px;
  align-self: start;
}

.sidebar-section {
  margin-bottom: 2rem;
}

.sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  user-select: none;
}

.sidebar-title .chevron {
  transition: transform 0.2s ease;
  font-size: 0.6rem;
}

.sidebar-title.collapsed .chevron {
  transform: rotate(-90deg);
}

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

.filter-list li {
  margin-bottom: 0.15rem;
}

.filter-list label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.2rem 0;
  transition: color 0.15s ease;
}

.filter-list label:hover {
  color: var(--text);
}

.filter-list input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
  position: relative;
  flex-shrink: 0;
}

.filter-list input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.filter-list input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.6rem;
  color: #000;
  font-weight: 700;
}

.filter-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-left: auto;
}

/* =========================================
   BLOG LIST TABLE HEADER
   ========================================= */
.blog-list-header {
  display: grid;
  grid-template-columns: 100px 1fr 30px;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

/* =========================================
   BLOG LIST
   ========================================= */
.blog-list {
  list-style: none;
}

.blog-item {
  display: block;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s ease;
  position: relative;
}

.blog-item:hover {
  background: var(--accent-bg);
}

.blog-item:hover .blog-title a {
  color: var(--text);
}

.blog-item a.blog-item-link {
  display: grid;
  grid-template-columns: 100px 1fr 30px;
  align-items: center;
  padding: 0.6rem 0;
  width: 100%;
  color: inherit;
  text-decoration: none;
}

.blog-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.blog-date .dot {
  width: 6px;
  height: 6px;
  background: var(--text);
  border-radius: 0;
  display: inline-block;
  flex-shrink: 0;
}

.blog-item:hover .blog-date .dot {
  background: var(--text);
}

.blog-title {
  font-size: 0.92rem;
  font-weight: 400;
}

.blog-title a {
  color: var(--text);
}

.blog-expand {
  font-size: 1.1rem;
  color: var(--text-muted);
  text-align: center;
  font-weight: 300;
}

/* =========================================
   BLOG POST PAGE
   ========================================= */
.post-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.post-hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.post-meta .tag {
  background: var(--bg-secondary);
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.post-hero h1 {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 800px;
  margin-bottom: 1rem;
}

.post-hero .post-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.6;
}

.post-content-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 3rem;
  padding-bottom: 4rem;
}

.post-content-layout.full-width {
  grid-template-columns: 1fr;
  max-width: 860px;
}

/* =========================================
   ARTICLE CONTENT
   ========================================= */
.post-content {
  max-width: var(--content-width);
  font-size: 1.05rem;
  line-height: 1.8;
}

.post-content h2 {
  font-family: var(--font-sans);
  font-size: 1.6rem;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.01em;
}

.post-content h3 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
}

.post-content p {
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

.post-content p:first-of-type {
  color: var(--text);
}

.post-content a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--border);
  transition: text-decoration-color 0.15s ease;
}

.post-content a:hover {
  text-decoration-color: var(--accent);
}

.post-content ul,
.post-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

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

.post-content blockquote {
  border-left: 3px solid var(--accent);
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  background: var(--bg-secondary);
  border-radius: 0 4px 4px 0;
}

.post-content blockquote p {
  margin-bottom: 0;
  font-style: italic;
  color: var(--text-secondary);
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--bg-secondary);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
}

.post-content pre {
  background: var(--nav-bg);
  color: #e0e0e0;
  padding: 1.25rem 1.5rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.88rem;
  line-height: 1.6;
}

.post-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.post-content img {
  border-radius: 6px;
  margin: 1.5rem 0;
  border: 1px solid var(--border);
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* =========================================
   INTERACTIVE / VISUAL EMBED BLOCKS
   ========================================= */
.embed-block {
  margin: 2rem 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.embed-block iframe {
  width: 100%;
  border: none;
  display: block;
}

.embed-block.full-bleed {
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
  border-radius: 0;
  border-left: none;
  border-right: none;
  max-width: 100vw;
}

.embed-caption {
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.visual-container {
  margin: 2rem 0;
  padding: 2rem;
  background: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid var(--border);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* =========================================
   TABLE OF CONTENTS (SIDEBAR)
   ========================================= */
.toc {
  position: sticky;
  top: 60px;
  align-self: start;
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.toc-list {
  list-style: none;
  border-left: 1px solid var(--border);
  padding-left: 1rem;
}

.toc-list li {
  margin-bottom: 0.5rem;
}

.toc-list a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color 0.15s ease;
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--text);
}

/* =========================================
   ABOUT PAGE
   ========================================= */
.about-page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.site-hero {
  padding: 4rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
  text-align: center;
}

.hero-doodles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 5rem;
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.75rem;
}

.site-tagline {
  font-size: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.about-hero {
  padding: 4rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
}

.about-hero h1 {
  font-family: var(--font-serif);
  font-size: 3.5rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.about-hero .subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  padding-bottom: 4rem;
}

.about-text {
  max-width: 520px;
}

.about-text p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.about-text h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
  color: var(--text);
}

.about-links {
  list-style: none;
  margin-top: 1.5rem;
}

.about-links li {
  margin-bottom: 0.6rem;
}

.about-links a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

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

.about-links .arrow {
  font-size: 0.75rem;
  transition: transform 0.15s ease;
}

.about-links a:hover .arrow {
  transform: translateX(3px);
}

.experience-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}

.experience-list li {
  margin-bottom: 1rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.experience-list strong {
  color: var(--text);
  font-weight: 600;
}

.publication {
  margin-bottom: 1.75rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border);
}

.publication:last-of-type {
  border-bottom: none;
}

.pub-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.35rem;
  line-height: 1.4;
}

.pub-venue {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
  font-style: italic;
}

.pub-authors {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.pub-links {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}

.pub-links a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

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

.pub-links .arrow {
  font-size: 0.7rem;
  transition: transform 0.15s ease;
}

.pub-links a:hover .arrow {
  transform: translateX(3px);
}

.about-photo {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.about-photo .photo-placeholder {
  width: 100%;
  max-width: 380px;
  aspect-ratio: 3/4;
  background: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* =========================================
   FOOTER
   ========================================= */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  margin-top: 2rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-muted);
}

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

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 900px) {
  .home-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1rem;
  }

  .sidebar-section {
    margin-bottom: 0;
  }

  .page-header h1 {
    font-size: 3rem;
  }

  .post-content-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    margin-bottom: 2rem;
    order: -1;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-photo {
    order: -1;
  }

  .post-hero h1 {
    font-size: 2rem;
  }
}

@media (max-width: 600px) {
  .top-nav {
    padding: 0 1rem;
    overflow-x: auto;
  }

  .nav-left {
    gap: 0.25rem;
  }

  .page-header {
    padding: 2rem 1rem 0.5rem;
  }

  .page-header h1 {
    font-size: 2.5rem;
  }

  .home-layout {
    padding: 1rem;
  }

  .blog-item a.blog-item-link {
    grid-template-columns: 85px 1fr 20px;
  }

  .blog-list-header {
    grid-template-columns: 85px 1fr 20px;
  }

  .blog-date {
    font-size: 0.7rem;
  }

  .blog-title {
    font-size: 0.85rem;
  }

  .post-page,
  .about-page {
    padding: 0 1rem;
  }

  .embed-block.full-bleed {
    margin-left: -1rem;
    margin-right: -1rem;
  }
}