/* ==========================================================================
   Design System & Theme Variables
   ========================================================================== */
:root {
  --bg-color: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --border-color: #94a3b8;
  --border-hover: #475569;
  --text-main: #111827;
  --text-muted: #4b5563;
  --text-subtle: #6b7280;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --badge-bg: #eff6ff;
  --badge-text: #1e40af;
  --badge-gold-bg: #fef9c3;
  --badge-gold-text: #854d0e;
  --shadow-sm: 0 2px 6px 0 rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.12), 0 2px 4px -1px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --radius-sm: 6px;
  --transition-speed: 0.2s;
  --sidebar-width: 310px;
}

[data-theme="dark"] {
  --bg-color: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #161b22;
  --border-color: #30363d;
  --border-hover: #484f58;
  --text-main: #f0f6fc;
  --text-muted: #8b949e;
  --text-subtle: #6e7681;
  --accent-color: #58a6ff;
  --accent-hover: #79c0ff;
  --badge-bg: #1c2d42;
  --badge-text: #79c0ff;
  --badge-gold-bg: #342a08;
  --badge-gold-text: #fde047;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-color: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #161b22;
    --border-color: #30363d;
    --border-hover: #484f58;
    --text-main: #f0f6fc;
    --text-muted: #8b949e;
    --text-subtle: #6e7681;
    --accent-color: #58a6ff;
    --accent-hover: #79c0ff;
    --badge-bg: #1c2d42;
    --badge-text: #79c0ff;
    --badge-gold-bg: #342a08;
    --badge-gold-text: #fde047;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  }
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-color);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color var(--transition-speed);
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

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

/* ==========================================================================
   Main Grid Layout
   ========================================================================== */
.site-container {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 3rem;
  flex: 1;
}

/* ==========================================================================
   Sidebar Styles
   ========================================================================== */
.sidebar {
  position: sticky;
  top: 2rem;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.profile-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.avatar-container {
  width: 100%;
  max-width: 270px;
  height: 220px;
  margin-bottom: 1.25rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 3px solid var(--border-color);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-speed);
}

.avatar-container:hover {
  transform: scale(1.03);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-name {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
  color: var(--text-main);
}

.profile-tagline {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-color);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.profile-bio {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.25rem;
  text-align: left;
  width: 100%;
}

.profile-nav {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  text-align: left;
}

.nav-divider {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 0.5rem 0;
  width: 100%;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.93rem;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

.nav-link i, .nav-link span.icon {
  width: 1.25rem;
  text-align: center;
  font-size: 1.1rem;
  color: var(--accent-color);
}

.nav-link:hover {
  background-color: var(--bg-secondary);
  color: var(--accent-color);
  text-decoration: none;
}

.nav-link-subtext {
  font-weight: 300;
  color: var(--text-subtle);
  font-size: 0.85em;
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.6rem;
  margin-top: 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.theme-toggle-btn:hover {
  border-color: var(--border-hover);
}

/* ==========================================================================
   Main Content Area
   ========================================================================== */
.main-content {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  min-width: 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.equal-contrib-note {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-muted);
  font-style: italic;
  text-transform: none;
  letter-spacing: normal;
}

/* ==========================================================================
   Scrollable Container Component (News, Publications, Projects)
   ========================================================================== */
.box-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.scrollable-box {
  overflow-y: auto;
  overflow-anchor: none;
  border: 2.5px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: max-height 0.35s ease-in-out;
}

.news-box {
  max-height: 200px;
}

.preprints-box {
  max-height: 660px;
}

.proceedings-box {
  max-height: 660px;
}

.workshops-box {
  max-height: 660px;
}

.projects-box {
  max-height: 620px;
}

.scrollable-box.expanded {
  max-height: none !important;
  overflow-y: visible !important;
}

/* Custom Scrollbar */
.scrollable-box::-webkit-scrollbar {
  width: 6px;
}
.scrollable-box::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 4px;
}
.scrollable-box::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 4px;
}

.box-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.25rem;
}

.btn-toggle-scroll {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.4rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-speed);
}

.btn-toggle-scroll:hover {
  background: var(--border-color);
}

/* ==========================================================================
   Video Container with Max Size Constraint
   ========================================================================== */
.video-container-max {
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

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

/* ==========================================================================
   Publication Items & Subsections
   ========================================================================== */
.pub-sub-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.25rem;
  margin-bottom: 0.75rem;
}

.pub-sub-header:first-child,
.pub-sub-section:first-child .pub-sub-header {
  margin-top: 0;
}

.pub-section-subtitle {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-main);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pub-section-subtitle::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 1.1rem;
  background-color: var(--accent-color);
  border-radius: 2px;
  flex-shrink: 0;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pub-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.25rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  overflow-anchor: none;
}

.pub-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.pub-thumb {
  width: 100%;
  height: 120px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  transition: border-color var(--transition-speed);
}

.pub-thumb:hover {
  border-color: var(--accent-color);
}

.pub-thumb a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.pub-thumb img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  transition: transform var(--transition-speed);
}

.pub-thumb:hover img {
  transform: scale(1.02);
}

.pub-details {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.pub-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-main);
}

.pub-title a {
  color: var(--text-main);
  text-decoration: none;
  transition: color var(--transition-speed);
}

.pub-title a:hover {
  color: var(--accent-color);
  text-decoration: underline;
}

.pub-venue {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
}

.pub-venue a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-speed);
}

.pub-venue a:hover {
  color: var(--accent-color);
  text-decoration: underline;
}

.pub-venue .award,
.pub-awards .award {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--badge-gold-text);
  background: var(--badge-gold-bg);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  margin-left: 0;
}

.pub-venue > .award {
  margin-left: 0.35rem;
}

.pub-awards {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.25rem;
}

.award.award-accepted {
  color: #15803d;
  background: #dcfce7;
}

.award.award-accepted i {
  color: #15803d;
}

[data-theme="dark"] .award.award-accepted {
  color: #4ade80;
  background: rgba(34, 197, 94, 0.18);
}

[data-theme="dark"] .award.award-accepted i {
  color: #4ade80;
}

.pub-authors {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.pub-authors b {
  color: var(--text-main);
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.4rem;
}

.pub-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.82rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--accent-color);
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
}

.pub-link-btn:hover {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
  text-decoration: none;
}

.bibtex-block {
  display: none;
  overflow-anchor: none;
  margin-top: 0.5rem;
  padding: 0.6rem 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.73rem;
  line-height: 1.35;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text-main);
}

.bibtex-block.active {
  display: block;
}

/* ==========================================================================
   News List Styles
   ========================================================================== */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.news-item {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  font-size: 0.95rem;
}

.news-date {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-subtle);
  min-width: 90px;
}

.news-text {
  color: var(--text-main);
  line-height: 1.5;
}

/* ==========================================================================
   Projects Grid & Card Styling
   ========================================================================== */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-speed), border-color var(--transition-speed);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}

.card-img-wrapper {
  width: 100%;
  height: 160px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  overflow: hidden;
}

.card-img-wrapper a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.card-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  transition: transform var(--transition-speed);
}

.card-img-wrapper:hover .card-img {
  transform: scale(1.03);
}

.card-body {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
}

.card-with {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.2rem;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.45;
  flex: 1;
}

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

/* ==========================================================================
   Math Notes & Demos List
   ========================================================================== */
.math-notes-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-left: 1.2rem;
  font-size: 0.93rem;
  color: var(--text-main);
}

.math-notes-list li {
  line-height: 1.45;
}

.math-notes-subtext {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-style: italic;
  display: inline;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-subtle);
  margin-top: auto;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 868px) {
  .site-container {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 1rem 0.75rem;
  }

  .sidebar {
    position: static;
  }

  .profile-card {
    display: grid;
    grid-template-columns: 84px 1fr;
    grid-template-areas:
      "avatar name"
      "avatar bio"
      "nav nav"
      "theme theme";
    gap: 0.4rem 1rem;
    padding: 1rem;
    text-align: left;
    align-items: center;
  }

  .avatar-container {
    grid-area: avatar;
    width: 84px;
    height: 68px;
    margin-bottom: 0;
  }

  .profile-name {
    grid-area: name;
    font-size: 1.3rem;
    margin-bottom: 0;
  }

  .profile-bio {
    grid-area: bio;
    font-size: 0.84rem;
    margin-bottom: 0;
    line-height: 1.35;
  }

  .profile-nav {
    grid-area: nav;
    display: flex;
    flex-direction: row;
    overflow-x: auto;
    white-space: nowrap;
    gap: 0.4rem;
    padding: 0.4rem 0 0.5rem 0;
    width: 100%;
    -webkit-overflow-scrolling: touch;
    cursor: grab;
    user-select: none;
  }

  .profile-nav.active-drag {
    cursor: grabbing;
  }

  .nav-divider {
    display: inline-block;
    width: 2px;
    height: 22px;
    border: none;
    background-color: var(--border-hover);
    margin: 0 0.5rem;
    align-self: center;
    flex-shrink: 0;
    border-radius: 1px;
  }

  .nav-link {
    padding: 0.35rem 0.65rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    font-size: 0.8rem;
    flex-shrink: 0;
  }

  .theme-toggle-btn {
    grid-area: theme;
    margin-top: 0.25rem;
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
    justify-self: start;
    width: auto;
  }

  .section-title {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
  }

  .equal-contrib-note {
    font-size: 0.8rem;
    margin-top: 0.1rem;
  }

  .pub-item {
    grid-template-columns: 1fr;
  }

  .pub-thumb {
    width: 100%;
    max-width: 320px;
  }
}

/* ==========================================================================
   Project Subpage Styles
   ========================================================================== */
.project-page {
  display: block;
}

.project-page > h1 {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.project-page > h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.project-page > h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  margin-top: 1rem;
}

.project-page > p,
.project-page-cont {
  margin-bottom: 1.25rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-main);
}

.project-media-cont,
.project-page div[style*="width"] {
  display: inline-block !important;
  vertical-align: top;
  margin-bottom: 1rem;
  box-sizing: border-box;
}

.project-media-cont img,
.project-media-cont video,
.project-media-cont iframe,
.project-page div[style*="width"] img,
.project-page div[style*="width"] video,
.project-page div[style*="width"] iframe {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

@media (max-width: 768px) {
  .project-media-cont,
  .project-page div[style*="width"] {
    width: 100% !important;
    display: block !important;
    margin: 0.75rem 0;
  }
}