@import url("https://fonts.googleapis.com/css2?family=Forum&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Noto+Serif+HK:wght@300;400;500&display=swap");

:root {
  /* Inspired by https://daveholloway.uk/ (bold, high-contrast, modern) */
  /* All-gray background theme */
  /* Single unified gray used everywhere */
  /* Ocean palette (from your reference image) */
  --bg: #2A4D88; /* Deep Blue */
  --bg_light: #7C94B8; /* Ocean City */
  --bg_mid: #B1BCC8; /* Glacial Salt */
  --bg_foam: #D9D9D8; /* Concerto */
  --panel: #ffffff;
  --text: #0b0d12;
  --muted: rgba(11, 13, 18, 0.68);
  --line: rgba(11, 13, 18, 0.10);
  --line-strong: rgba(11, 13, 18, 0.16);
  --link: #0b2bd6;
  --link-hover: #081f9a;
  --accent: #0b2bd6;
  --main-bg: #ffffff;
  --nav-height: 52px;
  /* Keep this for image sizing/etc if needed */
  --profile-width: 240px;
  /* Actual fixed info-card width */
  --info-card-width: 240px;
  --content-gap: 64px;
  --page-pad: 88px;
  --card-top: 12px;
  --cards-top: calc(var(--nav-height) + var(--card-top));
  --card-pad-top: 22px;
  /* Main text block sizing */
  --main-pad: 80px;
  --text-max: 1180px;
}

/* Desktop: make side margins + column gap responsive to viewport width */
@media (min-width: 1025px) {
  :root {
    --page-pad: clamp(16px, 4.5vw, 72px);
    --content-gap: clamp(18px, 4vw, 72px);
    --info-card-width: clamp(220px, 22vw, 300px);
    --main-pad: clamp(24px, 5vw, 80px);
  }
}

html { scroll-behavior: smooth; height: 100%; }

body {
  margin: 0;
  min-height: 100%;
  background: transparent;
  color: var(--text);
  font-family: "Forum", "Noto Serif HK", ui-serif, Georgia, "Times New Roman", Times, serif;
  font-weight: 400;
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  z-index: 0;
}

/* Slightly larger typography inside the main content card */
.main-card .main-inner {
  font-size: 1.05rem;
  line-height: 1.7;
}

/* Forum for titles/headings */
h1, h2, h3, .top-nav .brand {
  font-family: "Forum", ui-serif, Georgia, "Times New Roman", Times, serif;
  font-weight: 400;
}

/* Full-page background layer stretched to DOCUMENT height */
body::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    url("images/background.png") center top / 100% var(--bg-doc-h, 100%) no-repeat,
    var(--bg);
}

/* Very subtle grain to avoid banding on large gradients */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 4px 4px;
  opacity: 0.045;
  mix-blend-mode: overlay;
}

/* Hide Quarto chrome to match reference repo. */
.quarto-title-banner,
#title-block-header,
.page-footer,
footer.footer,
.nav-footer {
  display: none !important;
}

#quarto-content,
#quarto-document-content,
.page-columns,
.page-row,
.page-layout-article,
.content,
main,
main.content {
  width: 100% !important;
  max-width: none !important;
  margin: 0 !important;
  padding-left: 0 !important;
  padding-right: 0 !important;
  background: transparent !important;
}

main.content { padding: 0 !important; }

.site-shell {
  min-height: 100vh;
}

/* Quarto sometimes centers page-full content; force full-bleed. */
.site-shell.page-columns,
.site-shell.page-full,
.site-shell.page-columns.page-full {
  width: 100% !important;
  max-width: none !important;
  margin: 0 !important;
}

/* Top navigation bar */
.top-nav {
  position: fixed;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0 var(--page-pad);
  /* Prevent main content from showing through.
     We render the *page background* inside a pseudo-element. */
  background: transparent;
  position: fixed;
  isolation: isolate;
  border-bottom: 0 !important;
  box-shadow: none !important;
  outline: 0;
  /* Make the bottom border span full viewport width even inside Quarto wrappers */
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  box-sizing: border-box;
}

.top-nav::before {
  content: "";
  position: absolute;
  /* Extend 1-2px below to avoid seam line */
  inset: 0 0 -2px 0;
  z-index: -1;
  pointer-events: none;
  /* Paint the same background image (opaque) so only it is visible */
  background-color: var(--bg);
  background-image: url("images/background.png");
  background-repeat: no-repeat;
  background-size: 100% var(--bg-doc-h, 100%);
  /* Scroll-sync so the navbar "sees" the moving background */
  background-position: center calc(0px - var(--bg-scroll-y, 0px));
}

.top-nav .brand,
.top-nav .nav-links a {
  color: #ffffff;
}

.top-nav .nav-links a:hover {
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
}

.top-nav .brand {
  font-weight: 700;
  text-decoration: none;
  margin-right: 0.25rem;
  letter-spacing: -0.01em;
}

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

/* Mobile-only hamburger button (hidden on desktop) */
.top-nav .nav-toggle {
  display: none;
  margin-left: auto;
  appearance: none;
  border: 0;
  background: transparent;
  padding: 8px 10px;
  border-radius: 10px;
  color: #ffffff;
}
.top-nav .nav-toggle:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.65);
  outline-offset: 2px;
}
.top-nav .nav-toggle-icon {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  position: relative;
}
.top-nav .nav-toggle-icon::before,
.top-nav .nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background: currentColor;
}
.top-nav .nav-toggle-icon::before { top: -7px; }
.top-nav .nav-toggle-icon::after { top: 7px; }

.top-nav .nav-links a {
  text-decoration: none;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: 10px;
  border: 0;
}

.top-nav .nav-links a:hover {
  border-color: transparent;
}

.top-nav .nav-links a:hover {
  color: rgba(255, 255, 255, 0.88);
}

/* Space below fixed navbar handled in .content-shell.page-columns padding */

/* Space below fixed navbar */
.site-shell {
  padding-top: 0;
}

/* Background gradient is on body */
.content-shell { background: transparent; }

/* Two floating cards on top of gradient */
.content-shell {
  display: flex;
  width: 100%;
  min-height: calc(100vh - var(--nav-height));
  padding-bottom: var(--card-top);
}

/* Quarto adds layout classes; force our own column layout. */
.content-shell.page-columns,
.content-shell.page-full,
.content-shell.page-columns.page-full {
  display: flex !important;
  gap: var(--content-gap) !important;
  width: 100% !important;
  max-width: none !important;
  margin: 0 !important;
  /* Desktop layout: two columns in normal flow */
  padding: var(--cards-top) var(--page-pad) 0 var(--page-pad) !important;
  box-sizing: border-box;
}

/* Desktop: keep both cards top-aligned (container padding/top handles spacing) */
.profile-card,
.main-card {
  margin-top: 0 !important;
}

.content-shell.page-columns > aside.profile-card {
  order: 0 !important;
}

.content-shell.page-columns > main.main-card {
  order: 1 !important;
}

/* Floating left info card (only as tall as its content) */
.profile-card {
  flex: 0 0 var(--info-card-width);
  width: var(--info-card-width);
  align-self: flex-start;
  margin: 0;
  position: sticky;
  top: var(--cards-top);
  max-height: calc(100vh - var(--cards-top) - var(--card-top));
  overflow: auto;
  background: var(--panel);
  border: 0;
  border-radius: 0;
  padding: var(--card-pad-top) 28px 16px 28px;
  box-sizing: border-box;
  backdrop-filter: none;
  box-shadow: none;
}

/* Floating main content card (full height) */
.main-card {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  background: var(--main-bg) !important;
  border: 0;
  border-radius: 0;
  box-sizing: border-box;
  backdrop-filter: none;
  min-height: calc(100vh - var(--nav-height) - 48px);
  /* Let the PAGE scroll, so the background spans full document height */
  overflow: visible;
  box-shadow: none;
}

.main-card .main-inner {
  padding: var(--card-pad-top) var(--main-pad) 2rem var(--main-pad);
  background: transparent;
}

/* Constrain text line length inside main column */
.main-inner {
  max-width: var(--text-max) !important;
  width: 100%;
  margin: 0 auto;
}

.profile-avatar {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 50%;
  border: 8px solid rgba(255, 255, 255, 0.75);
  display: block;
  margin: 0 auto 14px;
}

.profile-name {
  text-align: center;
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0.35rem 0 0;
  border: 0 !important;
  color: #002FA7; /* match section headings */
}

.profile-sub {
  text-align: center;
  color: var(--muted);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0.1rem 0 0.9rem;
  /* Ensure Chinese renders with the intended CJK serif */
  font-family: "Noto Serif HK", "Forum", ui-serif, Georgia, "Times New Roman", Times, serif;
}

/* Quarto may add anchored heading decorations—disable them for the name. */
.profile-name.anchored::after,
.profile-name .anchorjs-link {
  display: none !important;
}

.profile-links {
  margin: 0.4rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.profile-links a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

.profile-links a.no-click {
  pointer-events: none;
  cursor: default;
}

.corner-copyright {
  position: fixed;
  left: 16px;
  bottom: 12px;
  z-index: 1200;
  color: rgba(255, 255, 255, 0.92);
  font-size: 12px;
  line-height: 1.2;
  background: transparent;
  border: 0;
  pointer-events: none;
}

.profile-links a:hover {
  color: var(--link-hover);
}

.profile-links i.bi {
  width: 22px;
  text-align: center;
  font-size: 1.1rem;
  color: #2d3e56;
}

/* Make headings match the clean style. */
h2, h3 { font-family: "Crimson Text", serif; }
h2 {
  margin: 0 0 0.7rem;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #002FA7; /* Klein blue */
  border-bottom: 0 !important;
  box-shadow: none !important;
  padding-bottom: 0 !important;
}

/* Add space between sections (space appears after previous section) */
.main-inner h2 {
  margin-top: 2rem;
}
.main-inner h2:first-of-type {
  margin-top: 0;
}

/* Light divider line after each section heading */
h2::after {
  content: "";
  display: block;
  height: 1px;
  background: rgba(11, 13, 18, 0.10);
  margin-top: 0.55rem;
}

.anchored .anchorjs-link { display: none !important; }

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

/* Headings + body copy contrast like the inspiration */
h2, h3 {
  letter-spacing: -0.02em;
}

p, li, .showcase-authors, .showcase-venue {
  color: rgba(11, 13, 18, 0.92);
}

/* Make each paper/project title bold */
.showcase-title {
  font-weight: 700;
}

/* Space between papers/projects */
.showcase-item {
  margin: 0 0 1.15rem 0;
  border-left: 2px solid rgba(11, 13, 18, 0.12);
  padding-left: 0.9rem;
}
.showcase-item:last-child {
  margin-bottom: 0;
}

/* Education: degree like title, school like authors */
.edu-item {
  margin: 0 0 1.15rem 0;
  border-left: 2px solid rgba(11, 13, 18, 0.12);
  padding-left: 0.9rem;
}
.edu-item:last-child {
  margin-bottom: 0;
}

/* Space between education list and the following paragraph */
.edu-list {
  margin-bottom: 1.25rem;
}
.edu-degree {
  font-weight: 700; /* like .showcase-title */
}
.edu-school {
  font-style: italic; /* like .showcase-authors */
}
.edu-time,
.edu-note {
}

.showcase-authors {
  font-style: italic;
}

/* Paper/project links: comma-separated, colored, underline on hover */
.showcase-links a {
  color: #78A2D2;
  text-decoration: none;
}
.showcase-links a:hover {
  text-decoration: underline;
}

/* Put venue on same row as meta tags */
.showcase-meta {
  display: block;
}

.showcase-venue {
  white-space: normal;
  font-style: normal;
}

.showcase-venue em {
  font-style: normal;
}

@media (max-width: 720px) {
  .showcase-venue {
    white-space: normal;
  }
}

/* Research interest tag colors */
.topic-mm { color: #FFBF65; font-weight: 700; }
.topic-gen { color: #FD8973; font-weight: 700; }
.topic-health { color: #56A5DD; font-weight: 700; }

/* (legacy) profile-column styles removed; using .profile-card now */

/* Make the icon/link list feel more “UI” */
.profile-links a {
  padding: 0.15rem 0;
}

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

.profile-links i.bi {
  color: #2d3e56;
}

/* Keep your existing section anchors usable with the rail nav. */
#about,
#research-interests,
#publications,
#projects,
#education,
#visitor-map {
  scroll-margin-top: calc(var(--nav-height) + 14px);
}

/* Visitor map (ClustrMaps) */
.visitor-map-frame {
  margin: 0.25rem 0 0 0;
  padding: 0.75rem 0 0 0;
  border-top: 1px solid var(--line);
  position: relative;
  z-index: 1;
  min-height: 120px;
}

.visitor-map-frame img,
.visitor-map-frame canvas {
  max-width: 100%;
  height: auto;
}

@media (max-width: 980px) {
  :root {
    --profile-width: 280px;
    --info-card-width: 300px;
  }
}

@media (max-width: 1024px) {
  /* Avoid compositing seams on mobile/tablet */
  body::after { display: none; }
  .top-nav { transform: translateZ(0); }

  .top-nav {
    padding: 0 16px;
    height: auto;
    align-items: stretch;
    gap: 0.5rem;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  /* Mobile navbar: brand + hamburger (links live below the nav) */
  .top-nav .brand {
    align-self: center;
    white-space: nowrap;
  }
  .top-nav .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .top-nav .nav-links {
    display: none; /* hide desktop links on mobile */
  }

  /* Mobile menu block that expands BELOW the fixed navbar */
  .mobile-nav-links {
    padding: 0 16px 0 16px; /* no hidden spacing when closed */
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    transition:
      max-height 260ms ease,
      opacity 200ms ease,
      transform 260ms ease;
  }
  .mobile-nav-links.is-open {
    padding: calc(var(--nav-height) + 8px) 16px 0 16px;
    /* Large enough to show all items; keeps transition smooth */
    max-height: 600px;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .mobile-nav-links a {
    display: block;
    /* Transparent menu over background (no white box) */
    color: rgba(255, 255, 255, 0.96);
    padding: 10px 0;
    border-radius: 0;
    background: transparent;
    backdrop-filter: none;
    margin-bottom: 6px;
    text-decoration: none;
    font-weight: 600;
  }
  .mobile-nav-links a:hover {
    background: transparent;
    text-decoration: underline;
  }

  /* Remove desktop fixed-sidebar offset padding on mobile */
  .content-shell.page-columns,
  .content-shell.page-full,
  .content-shell.page-columns.page-full {
    display: block !important; /* override desktop flex !important */
    /* Tighter spacing between navbar and first card on mobile */
    padding: calc(var(--nav-height) + 4px) 16px 0 16px !important;
    gap: 16px !important;
  }

  .content-shell {
    display: block;
  }
  .profile-card {
    position: static !important; /* ensure not fixed on mobile */
    left: auto !important;
    top: auto !important;
    max-height: none;
    margin: 16px 0 0 0 !important;
    width: auto !important;
    flex: none !important;
  }
  .main-card {
    margin: 16px 0 16px 0 !important;
    min-height: auto;
    width: auto !important;
  }
  .main-card .main-inner {
    padding: 1.25rem 1.25rem;
  }

  /* Mobile: profile links in 3 columns, centered rows */
  .profile-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    justify-items: center;
    text-align: center;
    column-gap: 8px;
    row-gap: 12px;
  }
  .profile-links a {
    flex-direction: column;
    justify-content: center;
    gap: 0.25rem;
  }
  .profile-links i.bi {
    width: auto;
  }
}