/* ==========================================================================
   Font Size System — only three sizes used site-wide
   ========================================================================== */

:root {
  --font-big: 20px;
  --font-md: 15px;
  --font-sm: 12px;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Roboto Slab', serif;
  font-weight: 300;
  color: #41484d;
  line-height: 1.6;
  font-size: var(--font-md);
  background: #fff;
}

a {
  color: indianred;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  border: 1px solid #888;
}

img.no-border,
.profile-icons img,
.profile-logos img {
  border: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 400;
  color: #41484d;
  line-height: 1.3;
  font-size: var(--font-big);
}

h1 { margin-bottom: 16px; }
h2 { margin-bottom: 12px; }
h3 { margin-bottom: 10px; }

p {
  margin-bottom: 12px;
}

hr {
  border: none;
  border-top: 1px solid #ddd;
  margin: 20px 0;
}

ul, ol {
  margin-left: 20px;
  margin-bottom: 12px;
}

/* ==========================================================================
   Layout Container
   ========================================================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

#page-wrapper {
  max-width: 1200px;
  margin: 0 auto;
}

/* ==========================================================================
   Header / Branding
   ========================================================================== */

#zone-branding {
  margin-top: 15px;
  padding: 15px 0 5px;
  border-bottom: 1px solid #eee;
  margin-left: 20px;
  margin-right: 20px;
}

#site-name {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

#site-name a {
  font-size: 39px;
  font-weight: 400;
  color: #41484d;
  text-decoration: none;
  letter-spacing: 0.5px;
}

#site-name a:hover {
  color: indianred;
  text-decoration: none;
}

#site-tagline {
  font-size: var(--font-md);
  color: #888;
  font-weight: 300;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

#zone-menu {
  margin: 0;
  padding: 0;
  margin-left: 20px;
  margin-right: 20px;
}

.menu-toggle {
  display: none;
  background: indianred;
  color: #fff;
  border: none;
  padding: 10px 20px;
  font-family: 'Roboto Slab', serif;
  font-size: var(--font-md);
  cursor: pointer;
  width: 100%;
  text-align: left;
}

#main-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0;
}

#main-menu li {
  margin: 0;
}

#main-menu li {
  margin: 0;
}

#main-menu li a {
  display: block;
  padding: 8px 16px;
  color: #41484d;
  font-weight: 400;
  font-size: var(--font-md);
  text-decoration: none;
  letter-spacing: 0.5px;
  border-bottom: 3px solid transparent;
  transition: border-color 0.2s;
}

#main-menu li:first-child a {
  padding-left: 0;
}

#main-menu li a:hover,
#main-menu li.active a {
  border-bottom-color: indianred;
  color: indianred;
  text-decoration: none;
}

/* ==========================================================================
   Content Layout (3-column on home, flexible on other pages)
   ========================================================================== */

#zone-content {
  padding: 20px;
}

#content-layout {
  display: grid;
  gap: 30px;
}

#content-layout.with-sidebars {
  grid-template-columns: 220px 1fr 240px;
}

#content-layout.wide-content {
  grid-template-columns: 220px 1fr;
}

#content-layout.full-width {
  grid-template-columns: 220px 1fr;
}

#content-layout.cv-layout-page {
  grid-template-columns: 220px 1fr;
}

/* ==========================================================================
   Sidebar (Left - Profile)
   ========================================================================== */

#sidebar-first {
  font-size: var(--font-sm);
}

.sidebar-profile {
  text-align: center;
}

.profile-photo {
  width: 200px;
  height: auto;
  border-radius: 4px;
  margin-bottom: 12px;
}

.profile-title {
  font-size: var(--font-md);
  margin-bottom: 2px;
}

.profile-dept {
  font-size: var(--font-md);
  color: #666;
  margin-bottom: 1px;
}

.profile-icons {
  margin: 15px 0;
  display: flex;
  justify-content: center;
  gap: 8px;
}

.profile-icons a img {
  width: 38px;
  height: 38px;
  opacity: 0.7;
  transition: opacity 0.2s;
  border-radius: 3px;
}

.profile-icons a img:hover {
  opacity: 1;
}

.profile-logos {
  margin-top: 15px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.profile-logos a {
  display: inline-block;
}

.logo-cil {
  width: 160px;
}

.logo-orcid {
  width: 110px;
}

/* ==========================================================================
   Sidebar (Right - News)
   ========================================================================== */

#sidebar-second {
  font-size: var(--font-sm);
}

.news-sidebar h3 {
  font-size: var(--font-md);
  margin-top: 25px;
  margin-bottom: 12px;
  color: #41484d;
}

.news-item {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid #eee;
}

.news-date {
  display: block;
  font-size: var(--font-sm);
  color: #888;
  margin-bottom: 3px;
}

.news-item p {
  margin: 0;
  font-size: var(--font-md);
}

.news-item a {
  font-size: var(--font-md);
}

.news-link-bracket {
  font-size: var(--font-sm) !important;
  color: indianred;
}

.news-link-icon {
  display: inline-flex;
  align-items: center;
  color: #666;
  border: 1px solid #ccc;
  border-radius: 3px;
  padding: 1px 4px;
  vertical-align: middle;
  margin-left: 2px;
  transition: all 0.15s;
}

.news-link-icon:hover {
  background: #eee;
  border-color: #999;
  color: #333;
  text-decoration: none;
}

.sidebar-section {
  margin-top: 25px;
  padding-top: 15px;
  border-top: 1px solid #eee;
}

.sidebar-section:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.sidebar-section h3 {
  font-size: var(--font-md);
  font-weight: 400;
  margin-bottom: 10px;
  color: #41484d;
}

.sidebar-recent-pubs {
  text-align: left;
  margin-bottom: 25px;
}

.sidebar-recent-pubs .sidebar-list li {
  font-size: var(--font-sm);
  line-height: 1.4;
}

.sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-list li {
  margin-bottom: 10px;
  font-size: var(--font-md);
  line-height: 1.5;
}

.sidebar-list li a {
  color: indianred;
  text-decoration: none;
}

.sidebar-list li a:hover {
  text-decoration: underline;
}

.travel-item {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid #eee;
}

.travel-city {
  font-size: var(--font-md);
  font-weight: 300;
  color: #41484d;
}

.travel-title {
  font-size: var(--font-md);
}

.more-link {
  margin-top: 15px;
  text-align: center;
}

.more-link a {
  font-size: var(--font-sm);
  font-weight: 400;
  color: indianred;
}

/* News full page */
.news-full-item {
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid #eee;
}

.news-full-item .news-date {
  font-size: var(--font-sm);
  color: #888;
}

.news-full-item p {
  font-size: var(--font-md);
  margin-bottom: 4px;
}

.news-detail {
  font-size: var(--font-sm) !important;
  color: #666;
}

/* ==========================================================================
   Main Content Area
   ========================================================================== */

#region-content {
  max-width: 900px;
  width: 100%;
  line-height: 1.7;
}

#region-content h1 {
  font-size: var(--font-big);
  margin-bottom: 20px;
}

.front #region-content {
  max-width: 710px;
  padding-right: 18px;
}

/* Highlight author name */
.myeong {
  text-decoration: underline;
}

/* Citation highlight */
.citation-highlight {
  background-color: #FBDC84;
  padding: 2px 4px;
}

/* ==========================================================================
   Badges (Awards, Status)
   ========================================================================== */

.badge {
  display: inline-block;
  font-size: var(--font-sm);
  padding: 2px 8px;
  border-radius: 4px;
  color: #fff;
  font-weight: 400;
  margin-left: 5px;
  vertical-align: middle;
}

.badge-award {
  background-color: #AD4E00;
}

.badge-ongoing {
  background-color: #99CCFF;
  color: #333;
}

.badge-funded {
  background-color: #ff6666;
}

.badge-fellowship {
  background-color: #e6ac00;
}

.badge-entrepreneurship {
  background-color: #8cd9b3;
  color: #333;
}

/* ==========================================================================
   Publications Page
   ========================================================================== */

.pub-subnav {
  margin-bottom: 25px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.pub-subnav a {
  display: inline-block;
  padding: 4px 10px;
  font-size: var(--font-sm);
  border: 1px solid #ddd;
  border-radius: 3px;
  color: #41484d;
  transition: all 0.2s;
}

.pub-subnav a:hover,
.pub-subnav a.active {
  background: indianred;
  color: #fff;
  border-color: indianred;
  text-decoration: none;
}

.pub-year-heading {
  font-size: var(--font-big);
  font-weight: 400;
  margin: 30px 0 15px 0;
  padding-bottom: 5px;
  border-bottom: 1px solid #eee;
}

.pub-year-heading:first-of-type {
  margin-top: 10px;
}

.pub-entry {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 20px;
  min-height: 100px;
}

.pub-thumbnail {
  flex-shrink: 0;
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: 3px;
}

.pub-thumbnail-placeholder {
  flex-shrink: 0;
  width: 120px;
  height: 120px;
  background: #f0f0f0;
  border-radius: 3px;
}

.pub-details {
  flex: 1;
}

.pub-title {
  font-size: var(--font-md);
  font-weight: 400;
  margin-bottom: 2px;
  line-height: 1.35;
  padding-top: 0;
  color: indianred;
}

.pub-title a {
  color: indianred;
}

.pub-venue {
  font-size: var(--font-md);
  color: #555;
  margin-bottom: 3px;
  line-height: 1.35;
}

.pub-authors {
  font-size: var(--font-sm);
  color: #666;
}

.pub-tags {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
  flex-wrap: wrap;
}

.pub-tags .badge {
  margin-left: 0;
}

.pub-type-tag {
  font-size: var(--font-xs, 0.75rem);
  font-weight: 400;
  color: #888;
}

a.pub-entry-link {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
  padding: 8px;
  margin: -8px;
  border-radius: 4px;
}

a.pub-entry-link:hover {
  background: #f8f8f8;
  text-decoration: none;
}

a.pub-entry-link .pub-title {
  color: indianred;
}

/* ==========================================================================
   Projects Page
   ========================================================================== */

.tag-filters {
  margin-bottom: 25px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px;
}

.project-categories {
  margin-bottom: 25px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-categories a {
  display: inline-block;
  padding: 6px 14px;
  font-size: var(--font-sm);
  border: 1px solid #ddd;
  border-radius: 3px;
  color: #41484d;
  transition: all 0.2s;
  flex: 1 1 auto;
  text-align: center;
  min-width: fit-content;
}

.project-categories a:hover,
.project-categories a.active {
  background: indianred;
  color: #fff;
  border-color: indianred;
  text-decoration: none;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

.project-card {
  max-width: 270px;
}

.project-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 3px;
  margin-bottom: 4px;
}

.project-card h3 {
  font-size: var(--font-md);
  font-weight: 400;
  margin-bottom: 6px;
}

.project-card h3 a {
  color: indianred;
}

.project-card p {
  font-size: var(--font-sm);
  color: #555;
  line-height: 1.5;
}

.project-status {
  margin-bottom: 8px;
}

.project-status .badge {
  font-size: var(--font-sm);
  border-radius: 3px;
  margin-left: 0;
  margin-right: 4px;
}

/* ==========================================================================
   Teaching Page
   ========================================================================== */

.teaching-section {
  margin-bottom: 30px;
}

.teaching-section h2 {
  font-size: var(--font-big);
  margin-bottom: 15px;
  border-bottom: 1px solid #eee;
  padding-bottom: 5px;
}

.course-item {
  margin-bottom: 16px;
  padding-left: 10px;
  border-left: 3px solid indianred;
}

.course-item h3 {
  font-size: var(--font-md);
  margin-bottom: 4px;
}

.course-item p {
  font-size: var(--font-sm);
  color: #555;
}

.course-item h3 a {
  font-size: var(--font-md);
}

/* ==========================================================================
   Media Page
   ========================================================================== */

.media-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.media-item {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid #eee;
}

.media-date {
  font-size: var(--font-sm);
  color: #888;
}

.media-outlet {
  font-size: var(--font-sm);
  color: #666;
  font-weight: 400;
}

.media-title {
  font-size: var(--font-md);
}

/* ==========================================================================
   CV Page
   ========================================================================== */

.cv-section {
  margin-bottom: 25px;
}

.cv-section h2 {
  font-size: var(--font-big);
  border-bottom: 1px solid #eee;
  padding-bottom: 5px;
  margin-bottom: 12px;
}

.cv-entry {
  margin-bottom: 10px;
  padding-left: 10px;
}

.cv-entry strong {
  font-weight: 400;
}

/* ==========================================================================
   Publication & Project Detail Pages
   ========================================================================== */

.pub-detail-image {
  text-align: center;
}

.pub-detail-image img,
.project-detail-image img {
  max-width: 640px;
  width: 100%;
  height: auto;
  border-radius: 4px;
  margin: 15px 0;
}

.project-detail-image {
  text-align: center;
}

.project-detail-video {
  text-align: center;
  margin: 15px 0;
}

.project-detail-video video {
  max-width: 640px;
  width: 100%;
  border-radius: 4px;
}

.pub-detail-body,
.project-detail-body {
  margin: 15px 0;
  line-height: 1.7;
}

.pub-detail-fields,
.project-detail-fields {
  margin-top: 20px;
  padding: 15px;
  background: #f9f9f9;
  border-radius: 4px;
  font-size: var(--font-sm);
}

.pub-detail-fields p,
.project-detail-fields p {
  margin-bottom: 8px;
}

.pub-cite-icons {
  display: inline-flex;
  gap: 3px;
  vertical-align: middle;
  margin-left: 4px;
}

.cite-btn {
  display: inline-flex;
  align-items: center;
  background: none;
  border: 1px solid #ccc;
  border-radius: 3px;
  padding: 2px 5px;
  cursor: pointer;
  color: #666;
  vertical-align: middle;
  margin-left: 2px;
  transition: all 0.15s;
}

.cite-btn:hover {
  background: #eee;
  border-color: #999;
  color: #333;
}

.cite-tooltip {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #333;
  color: #fff;
  padding: 6px 14px;
  border-radius: 4px;
  font-size: var(--font-sm);
  z-index: 1000;
  animation: fadeInOut 1.5s ease;
}

@keyframes fadeInOut {
  0% { opacity: 0; }
  15% { opacity: 1; }
  75% { opacity: 1; }
  100% { opacity: 0; }
}

/* ==========================================================================
   CV Page with Side Menu
   ========================================================================== */


.cv-side-menu {
  position: sticky;
  top: 20px;
  align-self: start;
  font-size: var(--font-md);
}

.cv-side-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.cv-side-menu li {
  margin-bottom: 3px;
}

.cv-side-menu a {
  color: #666;
  text-decoration: none;
  padding: 3px 0;
  display: block;
  border-left: 3px solid transparent;
  padding-left: 10px;
  transition: all 0.2s;
}

.cv-side-menu a:hover,
.cv-side-menu a.active {
  color: indianred;
  border-left-color: indianred;
}

.cv-main {
  max-width: 900px;
  width: 100%;
}

@media (max-width: 767px) {
  #content-layout.cv-layout-page {
    grid-template-columns: 1fr;
  }

  .cv-side-menu {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
    padding-bottom: 15px;
  }

  .cv-side-menu ul {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
  }

  .cv-side-menu a {
    border-left: none;
    padding: 4px 8px;
    border: 1px solid #ddd;
    border-radius: 3px;
    font-size: var(--font-sm);
  }
}

/* ==========================================================================
   Homepage specific
   ========================================================================== */

.home-section {
  margin-bottom: 25px;
}

.home-section h2 {
  font-size: var(--font-md);
  margin-bottom: 10px;
}

.research-focus-img {
  max-width: 100%;
  margin: 15px 0;
}

/* ==========================================================================
   Footer
   ========================================================================== */

#zone-footer {
  padding: 10px 20px 30px;
  text-align: center;
  font-size: var(--font-sm);
  color: #888;
}

#zone-footer a {
  color: indianred;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Tablet: 768px - 979px */
@media (max-width: 979px) {
  #content-layout.with-sidebars {
    grid-template-columns: 200px 1fr;
    grid-template-rows: auto auto;
  }

  #sidebar-second {
    grid-column: 1 / -1;
    border-top: 1px solid #eee;
    padding-top: 20px;
  }

  .news-sidebar {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .news-sidebar h3 {
    grid-column: 1 / -1;
  }

  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .project-card {
    max-width: none;
  }

  #content-layout.wide-content {
    grid-template-columns: 200px 1fr;
  }

  #content-layout.cv-layout-page {
    grid-template-columns: 200px 1fr;
  }
}

/* Mobile: < 768px */
@media (max-width: 767px) {
  #zone-branding {
    text-align: center;
  }

  /* Mobile nav */
  .menu-toggle {
    display: block;
  }

  #main-menu {
    display: none;
    flex-direction: column;
  }

  #main-menu.open {
    display: flex;
  }

  #main-menu li a {
    padding: 10px 16px;
    border-bottom: 1px solid #eee;
  }

  #main-menu li a:hover,
  #main-menu li.active a {
    border-bottom: 1px solid #eee;
    background: #f9f9f9;
  }

  /* Stack layout */
  #content-layout.with-sidebars,
  #content-layout.wide-content,
  #content-layout.full-width,
  #content-layout.cv-layout-page {
    grid-template-columns: 1fr;
  }

  #sidebar-first {
    display: none;
  }

  .front #sidebar-first {
    display: block;
    text-align: center;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
  }

  .profile-photo {
    width: 130px;
  }

  .profile-icons {
    justify-content: center;
  }

  #region-content {
    max-width: none;
  }

  .front #region-content {
    max-width: none;
    padding-right: 0;
  }

  /* Publications responsive */
  .pub-entry,
  a.pub-entry-link {
    flex-direction: column;
    gap: 10px;
  }

  .pub-thumbnail,
  .pub-thumbnail-placeholder {
    display: none;
  }

  #main-menu li:first-child a {
    padding-left: 16px;
  }

  /* Projects responsive */
  .project-grid {
    grid-template-columns: 1fr;
  }

  .project-card {
    max-width: none;
  }

  .project-card img {
    height: 200px;
  }

  /* News sidebar responsive */
  .news-sidebar {
    display: block;
  }

  /* Categories wrap */
  .project-categories {
    gap: 4px;
  }
}

/* Wide: >= 1220px */
@media (min-width: 1220px) {
  .container {
    max-width: 1180px;
  }
}