/* ===== CSS Custom Properties ===== */
:root {
  --bg-primary: #F5F0E8;
  --bg-card: #EDE8DD;
  --text-primary: #2D2D2D;
  --text-secondary: #5A5A5A;
  --text-heading: #1A1A1A;
  --accent: #C4613C;
  --accent-hover: #A8472A;
  --accent-sub: #8B6F47;
  --border: #D5CFC4;
  --highlight: #FFF8E7;
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Inter', 'Lato', Helvetica, sans-serif;
  --max-width: 900px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

/* ===== Typography ===== */
h1 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.2;
}

h2.section-heading {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}

h3.pub-category {
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent-sub);
  margin: 2rem 0 1rem;
}

h4.paper-title {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 0.25rem;
  display: inline;
}

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

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

p {
  margin-bottom: 0.75rem;
}

strong {
  font-weight: 600;
}

em {
  color: var(--text-secondary);
}

span.highlight {
  background-color: var(--highlight);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

/* ===== Layout ===== */
.site-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem 3rem;
}

section {
  margin-bottom: 3rem;
}

/* ===== Navigation ===== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.85rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.nav-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-heading);
}

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

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

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

/* ===== Hero / Banner ===== */
.hero {
  text-align: center;
  padding: 2.5rem 0 1.5rem;
}

.hero h1 {
  margin-bottom: 0.75rem;
}

.hero-banner {
  margin-top: 1.5rem;
}

.hero-banner img {
  width: 100%;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.hero-banner figcaption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  font-style: italic;
}

/* ===== Bio Section ===== */
.bio-content {
  display: flex;
  align-items: flex-start;
  gap: 2.5rem;
}

.bio-text {
  flex: 1;
}

.bio-text p {
  text-align: justify;
}

.bio-photo {
  flex-shrink: 0;
}

.bio-photo img {
  width: 220px;
  height: 220px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

/* ===== Publications ===== */
.pub-entry {
  display: flex;
  gap: 1.5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.pub-entry:last-child {
  border-bottom: none;
}

.pub-image {
  flex: 0 0 170px;
  position: relative;
  overflow: hidden;
}

.pub-image img {
  max-width: 100%;
  height: auto;
  display: block;
}

.pub-img-hover {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.25s ease-in-out;
}

.pub-entry:hover .pub-img-hover {
  opacity: 1;
}

.pub-details {
  flex: 1;
  min-width: 0;
}

.pub-details .paper-authors {
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
  color: var(--text-primary);
}

.pub-details .paper-venue {
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
}

.pub-details .paper-links {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.pub-details .paper-links a {
  font-weight: 500;
}

.pub-details .paper-abstract {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.pub-details .paper-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===== Experience ===== */
.experience-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.experience-item {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  transition: background-color 0.15s ease;
}

.experience-item:hover {
  background-color: var(--bg-card);
}

.company-logo {
  width: 50px;
  height: auto;
  flex-shrink: 0;
}

.experience-details {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  align-items: baseline;
}

.experience-details .company-name {
  font-weight: 600;
  color: var(--accent);
}

.experience-details .role {
  color: var(--text-primary);
}

.experience-details .dates {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-style: italic;
}

/* ===== Talks ===== */
.talks-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

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

.talk-item .talk-title {
  font-weight: 500;
}

.talk-item .talk-venue {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.talk-item .talk-links {
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

/* ===== Resources ===== */
.resources-list {
  list-style: none;
  padding: 0;
}

.resources-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  line-height: 1.6;
}

.resources-list li:last-child {
  border-bottom: none;
}

/* ===== Open Source ===== */
.opensource-content {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.opensource-content img {
  width: 140px;
  height: 140px;
  flex-shrink: 0;
  border-radius: 8px;
}

.opensource-text {
  flex: 1;
}

.opensource-text .project-title {
  font-weight: 600;
  color: var(--text-heading);
}

/* ===== Teaching ===== */
.teaching-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.teaching-item {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.teaching-item img {
  width: 100px;
  height: 100px;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: 8px;
}

.teaching-details {
  flex: 1;
}

.course-list {
  list-style: none;
  padding: 0;
  margin-top: 0.5rem;
}

.course-list li {
  padding: 0.2rem 0;
  font-weight: 500;
}

/* ===== Education ===== */
.education-content {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.education-content img {
  width: 120px;
  height: 120px;
  object-fit: contain;
  flex-shrink: 0;
}

.education-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.education-entry {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

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

.education-logo {
  width: 80px;
  height: 80px;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: 6px;
}

.education-entry .institution {
  font-weight: 600;
  color: var(--text-heading);
}

.education-entry .degree {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ===== Footer ===== */
.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--border);
  text-align: right;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===== Secondary Pages ===== */
.page-header {
  padding: 2rem 0 1rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--border);
}

.page-header h1 {
  margin-bottom: 0.5rem;
}

.page-header .back-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.content-section {
  margin-bottom: 2.5rem;
}

.content-section h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

.content-section h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-sub);
  margin: 1rem 0 0.5rem;
}

.content-section ol,
.content-section ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.content-section li {
  margin-bottom: 0.4rem;
}

.content-section blockquote {
  font-style: italic;
  border-left: 4px solid var(--border);
  padding-left: 1rem;
  margin: 1rem 0;
  color: var(--text-secondary);
}

.content-section figure img {
  width: 100%;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.content-section figcaption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  font-style: italic;
}

.content-section .faq-item {
  margin-bottom: 1.5rem;
}

.content-section .faq-item strong {
  display: block;
  margin-bottom: 0.3rem;
}

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

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2.section-heading {
    font-size: 1.4rem;
  }

  .site-wrapper {
    padding: 0 1.25rem 2rem;
  }

  .nav-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.75rem 1.25rem;
  }

  .nav-links {
    gap: 0.75rem;
  }

  .bio-content {
    flex-direction: column-reverse;
    gap: 1.5rem;
  }

  .bio-photo {
    align-self: center;
  }

  .bio-photo img {
    width: 180px;
    height: 180px;
  }

  .pub-entry {
    flex-direction: column;
    gap: 1rem;
  }

  .pub-image {
    flex: none;
    max-width: 200px;
  }

  .experience-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .opensource-content {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .teaching-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .education-content {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.6rem;
  }

  .nav-links {
    gap: 0.6rem;
    font-size: 0.85rem;
  }

  .bio-photo img {
    width: 150px;
    height: 150px;
  }

  .pub-image {
    max-width: 160px;
  }
}