/* ============================================================
   style.css - Academic personal/research site
   Matches the look of the previous Squarespace site:
   serif headings, generous whitespace, image+text rows,
   simple carousel, clean publication list.
   ============================================================ */

:root {
  --color-text: #2b2b2b;
  --color-muted: #6b6b6b;
  --color-link: #1a4f8b;
  --color-link-hover: #0d2c4f;
  --color-bg: #ffffff;
  --color-border: #e3e3e3;
  --font-serif: Georgia, 'Times New Roman', Times, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --max-width: 920px;
  --gutter: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover, a:focus {
  color: var(--color-link-hover);
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

/* ---------------- Layout shells ---------------- */

.page-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 28px 0;
}

.site-header .page-container {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0;
}

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

.site-title a:hover {
  text-decoration: none;
}

.site-nav a {
  margin-left: 24px;
  font-size: 0.95rem;
  color: var(--color-text);
}

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

.site-nav {
  display: inline-flex;
  align-items: baseline;
}

.nav-dropdown {
  position: relative;
  display: inline-block;
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 24px;
  min-width: 220px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 8px 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  z-index: 10;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  margin: 0;
  padding: 8px 16px;
  white-space: nowrap;
  font-size: 0.9rem;
}

.site-footer {
  margin-top: 64px;
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.85rem;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-logo img {
  height: 48px;
  width: auto;
  display: block;
  opacity: 0.75;
}

.footer-logo:hover img {
  opacity: 1;
}

.footer-info {
  text-align: center;
  flex: 1;
}

.footer-info p {
  margin: 2px 0;
}

@media (max-width: 640px) {
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ---------------- Carousel ---------------- */

.carousel {
  position: relative;
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  overflow: hidden;
  background: #111;
}

.carousel-track {
  display: flex;
  transition: transform 0.5s ease;
}

.carousel-slide {
  min-width: 100%;
  position: relative;
}

.carousel-slide img {
  width: 100%;
  height: auto;
  display: block;
}

.carousel-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px var(--gutter);
  background: linear-gradient(to top, rgba(0,0,0,0.65), rgba(0,0,0,0));
  color: #fff;
  font-size: 0.95rem;
}

.carousel-caption a {
  color: #fff;
}

.carousel-caption em {
  font-style: italic;
}

.carousel-controls {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 12px;
  pointer-events: none;
}

.carousel-controls button {
  pointer-events: auto;
  background: rgba(0,0,0,0.35);
  border: none;
  color: #fff;
  font-size: 1.4rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.2s;
}

.carousel-controls button:hover {
  background: rgba(0,0,0,0.6);
}

.carousel-dots {
  position: absolute;
  bottom: 10px;
  right: 16px;
  display: flex;
  gap: 6px;
}

.carousel-dots button {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.45);
  cursor: pointer;
  padding: 0;
}

.carousel-dots button.active {
  background: #fff;
}

/* ---------------- Bio / Welcome section ---------------- */

.bio-section {
  display: flex;
  gap: 32px;
  padding: 48px 0;
  align-items: flex-start;
}

.bio-photo {
  flex: 0 0 200px;
}

.bio-photo img {
  border-radius: 4px;
  width: 200px;
  height: 200px;
  object-fit: cover;
}

.bio-text h1 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  margin-top: 0;
  margin-bottom: 16px;
}

.bio-text p {
  margin: 0 0 14px;
}

@media (max-width: 640px) {
  .bio-section {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .bio-photo img {
    width: 160px;
    height: 160px;
  }
}

/* ---------------- Publication entries ---------------- */

.pub-section h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 8px;
  margin-top: 48px;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 24px 0 48px;
}

.pub-entry {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  align-items: start;
}

.pub-entry .pub-thumb img {
  width: 140px;
  height: 105px;
  object-fit: cover;
  border: 1px solid var(--color-border);
  border-radius: 2px;
}

.pub-title {
  font-weight: 600;
  font-size: 1.02rem;
  margin: 0 0 4px;
}

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

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

.pub-authors {
  color: var(--color-muted);
  font-size: 0.92rem;
  margin: 0 0 2px;
}

.pub-venue {
  font-style: italic;
  font-size: 0.9rem;
  color: var(--color-muted);
  margin: 0 0 6px;
}

.pub-links a {
  font-size: 0.88rem;
  margin-right: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

@media (max-width: 640px) {
  .pub-entry {
    grid-template-columns: 100px 1fr;
    gap: 12px;
  }
  .pub-entry .pub-thumb img {
    width: 100px;
    height: 75px;
  }
}

/* ---------------- Project page ---------------- */

.project-header {
  padding: 48px 0 24px;
  text-align: center;
}

.project-header h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin: 0 0 12px;
}

.project-header .pub-authors,
.project-header .pub-venue {
  font-size: 1rem;
  justify-content: center;
}

.project-links {
  margin: 20px 0;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.project-links a {
  border: 1px solid var(--color-link);
  border-radius: 4px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.project-links a:hover {
  background: var(--color-link);
  color: #fff;
  text-decoration: none;
}

.project-video {
  margin: 32px 0;
}

.project-video .video-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  background: #000;
}

.project-video .video-wrapper iframe,
.project-video .video-wrapper video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.project-abstract h2,
.project-bibtex h2,
.project-video h2 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 6px;
  margin-top: 40px;
}

.project-abstract p {
  text-align: justify;
}

.bibtex-wrapper {
  position: relative;
}

.project-bibtex pre {
  background: #f7f7f7;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 16px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
}

.bibtex-copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 4px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  color: var(--color-muted);
  transition: color 0.15s, border-color 0.15s;
}

.bibtex-copy-btn:hover {
  color: var(--color-link);
  border-color: var(--color-link);
}

/* ---------------- Publications page filter/group ---------------- */

.year-heading {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  margin-top: 40px;
  color: var(--color-muted);
}

/* ---------------- Research pages ---------------- */

.research-intro {
  padding: 48px 0 24px;
}

.research-intro h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin: 0 0 16px;
}

.research-intro p {
  text-align: justify;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  padding: 16px 0 48px;
}

.research-card {
  display: block;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.research-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  text-decoration: none;
}

.research-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.research-card h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin: 0;
  padding: 12px 16px;
}

.research-highlights {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 48px;
}

.research-highlight {
  border-top: 1px solid var(--color-border);
  padding-top: 32px;
}

.research-highlight h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  margin: 0 0 16px;
}

.research-banner {
  width: 100%;
  max-height: 360px;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: 16px;
}

.research-citation {
  margin-bottom: 12px;
}

.research-abstract {
  text-align: justify;
  color: var(--color-text);
}

/* ---------------- Project teaser ---------------- */

.project-teaser img {
  width: 100%;
  border-radius: 4px;
  margin: 24px 0;
}