/* ==========================================================================
   Xing Xu website custom styles for Quarto
   Works with:
   theme:
     light: cosmo
     dark: darkly
   ========================================================================== */

/* ---------- Typography ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --xx-font-sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", sans-serif;

  /* Light mode palette */
  --xx-text: #1f2328;
  --xx-heading: #111827;
  --xx-muted: #5f6b7a;
  --xx-accent: #1a73e8;
  --xx-border: #e5e7eb;
  --xx-paper-bg: #f8fbff;
  --xx-paper-border: #dbe8ff;
  --xx-navbar-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --xx-img-radius: 8px;
}

/* Dark mode: tie to Bootstrap/Quarto actual theme state */
html[data-bs-theme="dark"] {
  --xx-text: #e8eaed;
  --xx-heading: #f5f7fa;
  --xx-muted: #b7c0cc;
  --xx-accent: #8ab4f8;
  --xx-border: #2b3138;
  --xx-paper-bg: #161b22;
  --xx-paper-border: #334155;
  --xx-navbar-shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
}

/* ---------- Base ---------- */
body {
  font-family: var(--xx-font-sans);
  line-height: 1.65;
}

/* Limit custom text overrides to main content areas */
main,
.page-columns,
.content {
  color: var(--xx-text);
}

/* ---------- Headings ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--xx-font-sans);
  font-weight: 600;
  letter-spacing: 0.1px;
  color: var(--xx-heading);
}

h1 {
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}

h2, h3 {
  margin-top: 1.4rem;
}

/* ---------- Paragraphs & small text ---------- */
p {
  margin-bottom: 0.9rem;
}

.text-muted,
small,
.small,
.paper .meta {
  color: var(--xx-muted) !important;
}

/* ---------- Navbar ---------- */
.navbar {
  box-shadow: var(--xx-navbar-shadow);
}

.navbar .navbar-brand,
.navbar .nav-link {
  font-weight: 500;
}

/* Slightly cleaner spacing */
.navbar-nav .nav-link {
  padding-left: 0.7rem;
  padding-right: 0.7rem;
}

/* Email button in navbar */
.navbar .nav-link[href^="mailto:"] {
  border: 1px solid var(--xx-accent);
  border-radius: 8px;
  padding: 0.3rem 0.7rem;
  margin-left: 0.2rem;
  font-weight: 500;
  transition: all 0.18s ease;
}

.navbar .nav-link[href^="mailto:"]:hover {
  background: var(--xx-accent);
  color: #fff !important;
  text-decoration: none;
}

/* ---------- Links ---------- */
a {
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

main a,
.content a,
.page-columns a {
  color: var(--xx-accent);
}

/* Keep navbar/repo icons from underlining weirdly */
.navbar a:hover,
.sidebar a:hover {
  text-decoration: none;
}

/* ---------- Images & figures ---------- */
img,
figure img {
  border-radius: var(--xx-img-radius);
}

figure {
  margin-top: 1rem;
  margin-bottom: 1rem;
}

figcaption {
  color: var(--xx-muted);
  font-size: 0.95rem;
}

/* ---------- Research / paper blocks ---------- */
.paper {
  border-left: 4px solid var(--xx-paper-border);
  background: var(--xx-paper-bg);
  padding: 0.95rem 1.05rem;
  margin: 1rem 0;
  border-radius: 0 8px 8px 0;
}

.paper p:last-child {
  margin-bottom: 0;
}

.paper .meta {
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* ---------- Lists ---------- */
ul, ol {
  margin-top: 0.4rem;
  margin-bottom: 0.9rem;
  padding-left: 1.4rem;
}

li {
  margin-bottom: 0.2rem;
}

/* ---------- Tables ---------- */
table {
  border-radius: 6px;
  overflow: hidden;
}

table.table {
  border: 1px solid var(--xx-border);
}

th, td {
  vertical-align: middle;
}

/* ---------- Code ---------- */
code {
  font-size: 0.95em;
}

pre code {
  font-size: 0.93rem;
}

.code-copy-button {
  opacity: 0.85;
}

/* ---------- TOC ---------- */
#TOC,
.toc-active {
  font-size: 0.96rem;
}

.sidebar nav[role="doc-toc"] a {
  color: var(--xx-muted);
}

.sidebar nav[role="doc-toc"] a.active,
.sidebar nav[role="doc-toc"] a:hover {
  color: var(--xx-accent);
}

/* ---------- Footer ---------- */
.quarto-page-footer {
  border-top: 1px solid var(--xx-border);
  margin-top: 2rem;
  color: var(--xx-muted);
  font-size: 0.95rem;
}

/* Fix footer email link if plain markdown looks odd */
.quarto-page-footer a {
  color: var(--xx-accent);
}

/* ---------- Utilities ---------- */
/* Slightly nicer blockquotes */
blockquote {
  border-left: 4px solid var(--xx-border);
  padding-left: 1rem;
  color: var(--xx-muted);
  margin-left: 0;
}

/* Better horizontal rules */
hr {
  border: 0;
  border-top: 1px solid var(--xx-border);
  opacity: 1;
}

/* ---------- Mobile tweaks ---------- */
@media (max-width: 768px) {
  h1 {
    font-size: 1.9rem;
  }

  h2 {
    font-size: 1.45rem;
  }

  .paper {
    padding: 0.85rem 0.9rem;
  }

  .navbar .nav-link[href^="mailto:"] {
    display: inline-block;
    margin-top: 0.2rem;
  }
}