/* Academic Website Stylesheet - Inspired by Jiajun Wu's personal website */

header {
  width: 100%;
  height: 50px;
  margin-top: 0px;
  text-align: center;
  background-color: #003366;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}

body {
  margin: auto;
  padding: 0;
  color: #111;
  background: #fff;
  transition: all 0.2s ease;
  font-family: "Open Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14.5px;
  line-height: 170%;
  text-align: justify;
  font-weight: 400;
}

h1, h2, h3, h4, h5, h6, .title, span.title, .ftheader, span.venue, span.highlight {
  font-weight: 600;
}

h1, h2 {
  margin-top: 1.5em;
  margin-bottom: 0.8em;
  color: #003366;
  border-bottom: 1.5px solid #eaecef;
  padding-bottom: 0.3em;
}

h3 {
  margin-top: 1.2em;
  margin-bottom: 0.5em;
  color: #222;
}

ul, ol, dl {
  margin: 0;
  padding: 6px 10px 8px 24px;
}

li {
  margin-bottom: 6px;
}

img.img_responsive {
  width: 100%;
  height: auto;
  display: block;
}

.container a:link,
.container a:visited,
main a:link,
main a:visited {
  color: #0055AA;
  text-decoration: none;
}

.container a:hover,
main a:hover {
  text-decoration: underline;
}

.ftheader a:link,
.ftheader a:visited,
.ftsubheader a:link,
.ftsubheader a:visited {
  color: #FFFFFF;
  text-decoration: none;
}

.ftsubheader a {
  padding: 0 12px;
  font-size: 14px;
}

.ftsubheader a:hover {
  text-decoration: underline;
  opacity: 0.9;
}

.title a:link,
.title a:visited {
  color: #000000;
}

.authors {
  font-size: 100%;
  color: #555555;
  margin-top: 3px;
  margin-bottom: 3px;
}

.authors a:link,
.authors a:visited {
  color: #444444;
}

span.author-self {
  color: #000000;
  font-weight: 600;
  text-decoration: underline;
}

span.author, span.tag {
  white-space: nowrap;
}

.outercontainer {
  text-align: center;
  width: 100%;
}

.header-inner, .container, .content, main {
  text-align: left;
  margin-left: auto;
  margin-right: auto;
  max-width: 980px;
  width: 100%;
}

.header-inner {
  line-height: 50px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  box-sizing: border-box;
}

.ftheader {
  color: #FFF;
  font-size: 1.25em;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.ftsubheader {
  color: #FFF;
}

main.body {
  margin-top: 50px;
  padding: 25px 20px 60px 20px;
  box-sizing: border-box;
}

/* Heading section */
.heading {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  margin-top: 15px;
  margin-bottom: 25px;
}

.heading .img {
  flex-shrink: 0;
  width: 210px;
  margin-right: 35px;
}

.heading .img img {
  width: 100%;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
  display: block;
}

.heading .info {
  flex-grow: 1;
}

.heading .name {
  font-size: 26px;
  font-weight: 700;
  color: #111;
  margin-bottom: 4px;
}

.heading .name-zh {
  font-size: 22px;
  font-weight: 600;
  color: #444;
  margin-left: 8px;
}

.heading .role {
  font-size: 16px;
  font-weight: 600;
  color: #003366;
  margin-bottom: 6px;
}

.heading .affil {
  font-size: 14.5px;
  color: #333;
  line-height: 150%;
  margin-bottom: 12px;
}

.heading .links {
  margin-top: 12px;
  margin-bottom: 14px;
  font-size: 14px;
}

.heading .links a {
  margin-right: 14px;
  display: inline-block;
  font-weight: 600;
}

.heading .bio-text {
  margin-top: 10px;
  line-height: 175%;
}

/* Prospective students alert & collapsible */
.recruit-box {
  background: #f7f9fc;
  border-left: 4px solid #0055AA;
  padding: 14px 18px;
  margin: 24px 0;
  border-radius: 0 4px 4px 0;
}

.recruit-banner {
  font-size: 15px;
  font-weight: 600;
  color: #003366;
  cursor: pointer;
}

.recruit-banner span.toggle-arrow {
  display: inline-block;
  transition: transform 0.2s ease;
  font-size: 12px;
  margin-left: 6px;
}

.recruit-content {
  display: none;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed #d0d7de;
  font-size: 14px;
  line-height: 175%;
}

.recruit-content.active {
  display: block;
}

/* Research Directions Section */
.research-topic {
  display: flex;
  margin-bottom: 26px;
  padding-bottom: 20px;
  border-bottom: 1px solid #f0f0f0;
}

.research-topic:last-child {
  border-bottom: none;
}

.research-topic .thumb {
  flex-shrink: 0;
  width: 240px;
  margin-right: 25px;
  padding-top: 4px;
}

.research-topic .thumb img,
.research-topic .thumb .placeholder-thumb {
  width: 100%;
  border-radius: 4px;
  border: 1px solid #e1e4e8;
  display: block;
}

.research-topic .desc {
  flex-grow: 1;
}

.research-topic .desc h3 {
  margin-top: 0;
  font-size: 16px;
  color: #003366;
}

.research-topic .desc p {
  margin: 6px 0 0 0;
  line-height: 168%;
}

/* Publications Section */
.publication {
  display: flex;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid #f4f4f4;
}

.publication:last-child {
  border-bottom: none;
}

.publication .img {
  flex-shrink: 0;
  width: 240px;
  margin-right: 25px;
  padding-top: 4px;
}

.publication .img img,
.publication .img .pub-thumb {
  width: 100%;
  border-radius: 4px;
  border: 1px solid #e1e4e8;
  display: block;
}

.publication .text {
  flex-grow: 1;
}

.publication .title {
  font-size: 15px;
  font-weight: 600;
  line-height: 140%;
  color: #000;
}

.publication .authors {
  font-size: 13.8px;
}

.publication .venue {
  font-size: 13.8px;
  color: #222;
  font-style: italic;
}

.publication .links {
  margin-top: 5px;
  font-size: 13px;
}

.publication .links a {
  margin-right: 10px;
  font-weight: 600;
}

span.highlight {
  color: #BB2222;
  font-weight: 600;
}

/* Placeholder for visuals */
.visual-card {
  background: #f6f8fa;
  border: 1px solid #d0d7de;
  border-radius: 4px;
  height: 135px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: #656d76;
  font-size: 12px;
  text-align: center;
  padding: 8px;
  box-sizing: border-box;
}

.visual-card svg {
  margin-bottom: 6px;
  stroke: #0055AA;
}

/* Anchor offset for fixed header */
.anchor {
  scroll-margin-top: 65px;
}

/* Footer */
footer {
  margin-top: 50px;
  padding-top: 20px;
  border-top: 1px solid #eaecef;
  text-align: center;
  font-size: 13px;
  color: #777;
}

/* Responsive */
@media only screen and (max-width: 768px) {
  header {
    height: auto;
    position: relative;
  }
  .header-inner {
    flex-direction: column;
    line-height: normal;
    padding: 12px 15px;
  }
  .ftheader {
    margin-bottom: 8px;
  }
  .ftsubheader a {
    padding: 0 8px;
    font-size: 13px;
  }
  main.body {
    margin-top: 0;
    padding: 15px;
  }
  .heading {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .heading .img {
    margin-right: 0;
    margin-bottom: 20px;
    width: 170px;
  }
  .heading .links {
    margin-bottom: 18px;
  }
  .research-topic, .publication {
    flex-direction: column;
  }
  .research-topic .thumb, .publication .img {
    width: 100%;
    margin-right: 0;
    margin-bottom: 12px;
  }
  body {
    text-align: left;
  }
}