@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:wght@400;600&display=swap');

:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --text: #000000;
  --muted: #5d6779;
  --line: #dde3ee;
  --line-strong: #cfd7e5;
  --link: #3a74ea;
  --link-hover: #173a7b;
  --rail-width: 130px;
}

html[data-theme="dark"] {
  --bg: #12161d;          /* deep gray, not pure black */
  --panel: #12161d;       /* match background */
  --text: #f4f6f8;        /* near-white text */
  --muted: #b3bccb;
  --line: #2a3342;
  --line-strong: #3b465a;
  --link: #8bb3ff;
  --link-hover: #b8d0ff;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Crimson Text", serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.quarto-title-banner,
#title-block-header,
.navbar {
  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;
}

main.content {
  padding: 0 !important;
}

.site-shell {
  display: grid;
  grid-template-columns: var(--rail-width) minmax(0, 1fr);
  min-height: 100vh;
}

.profile-rail {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 2rem 0.8rem;
  box-sizing: border-box;
  text-align: right;
}

.rail-topbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
}

.rail-brand {
  margin: 0;
  padding-right: 0.65rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  text-align: right;
}

.rail-topbar-actions {
  display: none;
  align-items: center;
  gap: 0.1rem;
}

.rail-nav {
  margin-top: 0.5rem;
  display: grid;
  gap: 0;
}

.rail-nav a {
  display: block;
  border-radius: 10px;
  padding: 0.42rem 0.65rem;
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  font-family: "Crimson Text", serif;
  font-size: 1rem;
  letter-spacing: 0.01em;
  text-align: right;
}

.rail-nav a:hover {
  color: var(--text);
  background: transparent;
}

.rail-theme-toggle {
  margin-top: 0.25rem;
  justify-self: end;
  width: fit-content;
  border: 0;
  background: transparent;
  padding: 0.38rem 0.55rem;
  border-radius: 10px;
  color: var(--muted);
  text-align: right;
  cursor: pointer;
}

.rail-theme-toggle:hover {
  color: var(--text);
}

.rail-theme-toggle:focus-visible {
  outline: 2px solid var(--line-strong);
  outline-offset: 2px;
}

.rail-theme-toggle i {
  font-size: 1rem;
  line-height: 1;
}

.rail-menu-toggle {
  border: 0;
  background: transparent;
  padding: 0.38rem 0.55rem;
  border-radius: 10px;
  color: var(--muted);
  cursor: pointer;
  display: none;
}

.rail-menu-toggle:hover {
  color: var(--text);
}

.rail-menu-toggle:focus-visible {
  outline: 2px solid var(--line-strong);
  outline-offset: 2px;
}

.rail-menu-toggle i {
  font-size: 1.1rem;
  line-height: 1;
}

.rail-footer {
  position: absolute;
  right: 1rem;
  bottom: 0.5rem;
  color: #babec4;
  font-size: 0.6rem;
  text-align: right;
}

.main-column {
  min-width: 0;
  width: 100%;
  padding: 1.5rem 0 2rem 1.5rem;
  box-sizing: border-box;
}

.content-card {
  margin: 0 0 2.1rem;
}

.content-card h2,
.content-card h3 {
  font-family: "Crimson Text", serif;
}

.content-card h2 {
  margin: 0 0 0.7rem;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

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

.content-card h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.content-card p {
  margin: 0.35rem 0 0;
  color: var(--text);
}

.content-card ul {
  margin: 0.6rem 0 0;
  padding-left: 1.2rem;
}

.content-card li + li {
  margin-top: 0.45rem;
}

.content-card p.project-meta {
  color: var(--muted);
}

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

.content-card a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.content-card a.paper-link {
  color: var(--text);
}

.content-card a.paper-link:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.about-layout {
  display: grid;
  gap: 1rem;
}

.about-intro {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
}

.profile-avatar {
  width: 96px;
  height: 96px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid #e5ebf5;
}

html[data-theme="dark"] .profile-avatar {
  border-color: var(--line);
}

.about-meta {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.about-meta p {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  align-items: center;
}

.about-meta a {
  color: inherit;
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.meta-item i {
  font-size: 0.85rem;
}

.meta-sep {
  color: var(--line-strong);
}

.rail-nav-theme-toggle {
  display: inline-flex;
  align-items: center;
  margin-top: 0.35rem;
  padding: 0.42rem 0.65rem;
}

.item-list {
  display: grid;
  gap: 0.9rem;
}

.item-list article {
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
}

.item-list article:first-child {
  padding-top: 0;
  border-top: 0;
}

#about,
#projects {
  scroll-margin-top: 20px;
}

.page-footer,
footer.footer,
.nav-footer {
  display: none !important;
}

@media (max-width: 980px) {
  :root {
    --rail-width: 150px;
  }

  .profile-rail {
    padding: 1.5rem 0.85rem;
  }

  .rail-brand {
    font-size: 1rem;
  }

  .main-column {
    padding: 1.5rem 0.75rem 2rem 0.75rem;
  }

  .about-layout {
    gap: 0.85rem;
  }

  .about-intro {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  :root {
    --rail-width: 120px;
  }

  .site-shell {
    display: block;
  }

  .profile-rail {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: auto;
    padding: 0.5rem 0.6rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    text-align: left;
    z-index: 20;
  }

  .rail-brand {
    font-size: 0.95rem;
    margin-left: 0.2rem;
    padding-right: 0;
  }

  .rail-menu-toggle {
    display: inline-flex;
    align-items: center;
    padding: 0.38rem 0;
  }

  .rail-topbar {
    justify-content: space-between;
  }

  .rail-topbar-actions {
    display: flex;
  }

  .rail-nav {
    margin-top: 0.25rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
  }

  .rail-nav.open {
    max-height: 200px; /* enough for 4 links */
  }

  .rail-nav a {
    padding: 0.3rem 0;
    font-size: 0.95rem;
    text-align: left;
  }

  .rail-theme-toggle {
    margin-top: 0;
  }

  .rail-nav-theme-toggle {
    position: fixed;
    top: 0.45rem;
    right: 2.4rem;
    margin-top: 0;
    padding: 0.38rem 0.45rem;
    z-index: 25;
  }

  .main-column {
    padding: 3.2rem 0.6rem 1.5rem 0.6rem;
  }

  .content-card {
    margin-bottom: 1.4rem;
  }

  .content-card h2 {
    font-size: 1.55rem;
  }

  .content-card h3 {
    font-size: 1rem;
  }

  .rail-footer {
    display: none;
  }

  .main-column::after {
    content: "© 2026 Jiakai Chen";
    display: block;
    margin-top: 1rem;
    color: #babec4;
    font-size: 0.6rem;
    text-align: left;
  }

}