/* ============================================================
   Unified stylesheet: base + index + about + dark mode
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,wght@0,300;0,400;1,400&family=DM+Sans:wght@300;400&display=swap');

/* Design tokens (light) */
:root {
  --primary:       #5a67d8;
  --accent:        #5a67d8;
  --accent-light:  #ebedfa;
  --secondary:     #718096;
  --success:       #48bb78;
  --background:    #f5f6fa;
  --background-secondary: #ffffff;
  --text:          #2d2d3a;
  --ink:           #2d2d3a;
  --muted:         #888;
  --border:        #e0e0ec;
  --shadow:        rgba(90, 103, 216, 0.07);
  --radius:        10px;
}

/* Design tokens (dark) */
[data-quarto-color-scheme="dark"],
body.quarto-dark {
  --primary:              #667eea;
  --accent:               #667eea;
  --accent-light:         rgba(102, 126, 234, 0.15);
  --primary-dark:         #5a67d8;
  --primary-light:        #a3bffa;
  --background:           #0d0f14;
  --background-secondary: #161820;
  --background-tertiary:  #1e2030;
  --text:                 #e8e0d0;
  --ink:                  #e8e0d0;
  --muted:                #9993b4;
  --border:               rgba(102, 126, 234, 0.2);
  --shadow:               rgba(0, 0, 0, 0.35);
  --code-bg:              #1e2030;
  --code-text:            #e2e8f0;
  --link:                 #90cdf4;
  --link-hover:           #63b3ed;
}

/* ============================================================
   BASE
   ============================================================ */

html { overflow-y: scroll; }

body {
  display: flex;
  flex-direction: column;
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
  background-color: var(--background);
  color: var(--text);
  transition: background-color 0.3s ease, color 0.3s ease;
}

body.modal-open {
  overflow: hidden;
  padding-right: 0;
}

#quarto-content {
  flex: 1 0 auto;
  overflow: hidden;
}

/* Typography */
h1, h2, h3, h4,
.title, .subtitle {
  font-family: 'Source Serif 4', Georgia, serif;
  font-weight: 400;
}

.quarto-title h1.title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 300;
  color: var(--ink);
  margin-bottom: 0.3rem;
}

.quarto-title .subtitle {
  font-size: 0.92rem;
  color: var(--muted);
  font-style: italic;
  line-height: 1.6;
}

strong { color: #4c5b9e; }
em     { color: #8a6c9c;   }

body.quarto-dark strong { color: #8f9ef0; }
body.quarto-dark em     { color: #b79fd0; }

/* ============================================================
   NAVBAR
   ============================================================ */

.navbar {
  background-color: #5a67d8;
  min-height: 60px;
  height: 60px;
  border-bottom: 1px solid transparent;
}

.navbar-container {
  display: flex;
  align-items: center;
  height: 100%;
}

.navbar-brand img { max-height: 40px; width: auto; }

.navbar .search-input {
  height: 32px;
  margin-top: auto;
  margin-bottom: auto;
}

.navbar-title,
.navbar-nav .nav-link {
  color: rgba(255, 255, 255, 0.9) !important;
}

.navbar-nav .nav-link {
  position: relative;
  transition: color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.navbar-nav .nav-link::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background: linear-gradient(90deg, #ffd700, #ffed4e);
  border-radius: 1px;
  transition: width 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.navbar-nav .nav-link:hover::after { width: 100%; }
.navbar-nav .nav-link:hover { color: #ffd700 !important; }

.nav-link:hover {
  opacity: 0.8;
  transform: translateY(-2px);
  transition: all 0.2s ease-in-out;
}

/* Navbar icons */
.navbar .quarto-navigation-tool,
.navbar .quarto-search-toggle,
.navbar .quarto-color-scheme-toggle,
.navbar .bi,
.navbar svg {
  color: white;
  fill: white;
}

#quarto-search .bi-search,
.quarto-search-toggle .bi-search { fill: white; }
.quarto-search-pwa-close { color: white; }

/* Dark/light mode toggle icon */
.quarto-color-scheme-toggle .bi::before { display: none; }
.quarto-color-scheme-toggle .bi::after {
  display: inline-block;
  font-family: 'bootstrap-icons';
  font-style: normal;
  font-weight: normal;
  font-variant: normal;
  text-transform: none;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 1.2rem;
  vertical-align: middle;
}
body.quarto-light .quarto-color-scheme-toggle .bi::after {
  content: "\F497";
  color: #ffffff;
}
body.quarto-dark .quarto-color-scheme-toggle .bi::after {
  content: "\F5A2";
  color: #ffffff;
  text-shadow: 0 0 10px rgba(255, 202, 40, 0.5);
}

/* nav-link color in dark mode */
[data-quarto-color-scheme="dark"] .nav-link,
body.quarto-dark .nav-link { color: rgba(255,255,255,0.85); }

/* ============================================================
   FOOTER
   ============================================================ */

.nav-footer {
  background-color: var(--primary);
  color: white;
  padding: 0;
  border-top: none;
  min-height: 60px;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-footer .nav-footer-center {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.25rem 0.4rem;
  padding: 0.9rem 1rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.02em;
  white-space: normal;
  text-align: center;
  line-height: 1.6;
}

.nav-footer a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  transition: color 0.2s ease;
  padding-bottom: 1px;
}

.nav-footer a:not(:has(i, .bi)) {
  border-bottom: 1px dashed rgba(255, 255, 255, 0.4);
}

.nav-footer a:hover {
  color: #ffd700;
  border-bottom-color: #ffd700;
}
.nav-footer i,
.nav-footer .bi {
  font-size: 1.2rem;
  vertical-align: middle;
  margin-right: 5px;
}

/* ============================================================
   PAGE LAYOUT
   ============================================================ */

.column-page,
#listing-listing,
.quarto-listing {
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.column-page hr {
  margin-left: -1.5rem;
  margin-right: -1.5rem;
  border: none;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  margin-bottom: 2rem;
}

h2 {
  font-size: 1.1rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

#recent-posts { white-space: nowrap; }

/* ============================================================
   FEATURE CARDS  (index.qmd welcome grid)
   ============================================================ */

.g-col-12,
.g-col-md-4 {
  background: var(--background-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  margin-bottom: 1.2rem;
  box-shadow: 0 2px 16px var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  color: var(--ink);
}

.g-col-12:hover,
.g-col-md-4:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(90, 103, 216, 0.13);
}

.g-col-12 h3,
.g-col-md-4 h3 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1rem;
  font-weight: 400;
  margin-top: 0;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.g-col-12 p,
.g-col-md-4 p {
  font-size: 0.875rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0;
}

/* ============================================================
   LISTING CARDS  (Quarto-generated post grid)
   ============================================================ */

.quarto-listing .quarto-post {
  margin-bottom: 1em;
  padding-top: 0;
}

.quarto-post .card,
.quarto-listing-cols-3 .card,
.quarto-grid-item {
  background: var(--background-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 2px 16px var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  overflow: hidden;
}

.quarto-post .card:hover,
.quarto-listing-cols-3 .card:hover,
.quarto-grid-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(90, 103, 216, 0.13);
}

.quarto-grid-item .card-title,
.listing-title {
  font-family: 'Source Serif 4', Georgia, serif;
  font-weight: 400;
  color: var(--ink);
}

.listing-date,
.listing-author,
.card-text.listing-description {
  font-size: 0.8rem !important;
  color: var(--muted);
}

.quarto-listing-container-default .metadata { width: 80px; flex-basis: 80px; }

.quarto-listing-container-default .quarto-post .listing-author,
.quarto-listing-container-default .quarto-post .listing-date {
  font-size: 13px;
  font-weight: 400;
  line-height: 1.2;
}

.listing-categories .listing-category {
  background: var(--accent-light);
  color: var(--accent);
  border: none;
  border-radius: 4px;
  font-size: 0.7rem;
  padding: 0.15em 0.6em;
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */

/* Profile image */
.about-image img,
img.about-image {
  border-radius: var(--radius) !important;
  border: 1px solid var(--border);
  box-shadow: 0 2px 16px var(--shadow);
}

/* Social link buttons — override Quarto trestles default */
.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

div.quarto-about-trestles .about-entity .about-link,
.quarto-about-trestles .btn-outline-dark {
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 0.8rem;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 0.35em 0.9em;
  background: transparent;
  text-decoration: none;
  transition: background 0.15s, color 0.15s, box-shadow 0.15s;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

div.quarto-about-trestles .about-entity .about-link:hover,
.quarto-about-trestles .btn-outline-dark:hover {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 12px rgba(90, 103, 216, 0.25);
}

/* About body text */
#hero-heading p {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 1.6rem;
}

/* About section headings */
#hero-heading h2 {
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 1.8rem;
  margin-bottom: 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

#hero-heading ul {
  list-style: none;
  padding: 0;
  margin: 0 0 0.5rem;
}

#hero-heading li {
  font-size: 0.9rem;
  color: var(--ink);
  line-height: 1.7;
  padding: 0.15rem 0;
}

#hero-heading li em,
#hero-heading p em {
  color: var(--muted);
  font-style: italic;
  font-size: 0.85rem;
}

/* ============================================================
   MATH / LaTeX
   ============================================================ */

.math.display {
  background: rgba(90, 103, 216, 0.05);
  border-left: 4px solid var(--accent);
  padding: 1rem;
  margin: 1.2rem 0;
  border-radius: 4px;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  box-sizing: border-box;
}

.mjx-chtml.MJXc-display { margin: 0; }

mjx-container[display="true"] {
  width: 100%;
  margin: 1em 0;
  text-align: center;
}

/* ============================================================
   CODE BLOCKS
   ============================================================ */

pre.sourceCode, .cell-output pre {
  background: rgba(16, 185, 129, 0.05);
  border-left: 4px solid #10b981;
  padding: 1.5rem;
  margin: 0;
  border-radius: 4px;
  font-family: 'SFMono-Regular', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
  font-size: 0.9em;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
  box-sizing: border-box;
  width: 100%;
  position: relative;
}

.code-with-title { margin-top: 1.5rem; }
.code-title {
  background: #10b981;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 4px 4px 0 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 0.85em;
  font-weight: 600;
}
.code-title + pre {
  border-radius: 0 0 4px 4px;
  border-top: none;
  margin-top: 0;
}

pre.sourceCode button.code-copy,
.cell-output pre button.code-copy,
div.sourceCode button.code-copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: #f8f9fa;
  color: #495057;
  border: 1px solid #dee2e6;
  border-radius: 3px;
  padding: 0.25rem 0.5rem;
  font-size: 0.75em;
  cursor: pointer;
  transition: all 0.2s ease;
  z-index: 10;
  opacity: 0.8;
}
pre.sourceCode button.code-copy:hover,
.cell-output pre button.code-copy:hover,
div.sourceCode button.code-copy:hover {
  background: #e9ecef;
  border-color: #10b981;
  opacity: 1;
}

/* ============================================================
   DARK MODE OVERRIDES
   ============================================================ */

[data-quarto-color-scheme="dark"] body,
body.quarto-dark {
  background-color: var(--background);
}

/* Cards */
[data-quarto-color-scheme="dark"] .g-col-12,
[data-quarto-color-scheme="dark"] .g-col-md-4,
[data-quarto-color-scheme="dark"] .quarto-grid-item,
[data-quarto-color-scheme="dark"] .card,
body.quarto-dark .g-col-12,
body.quarto-dark .g-col-md-4,
body.quarto-dark .quarto-grid-item,
body.quarto-dark .card {
  background: var(--background-secondary);
  box-shadow: 0 4px 6px var(--shadow);
}

/* Code */
[data-quarto-color-scheme="dark"] pre,
body.quarto-dark pre {
  background-color: var(--code-bg);
  color: var(--code-text);
  border-color: var(--border);
}

[data-quarto-color-scheme="dark"] pre.sourceCode,
[data-quarto-color-scheme="dark"] .cell-output pre,
body.quarto-dark pre.sourceCode,
body.quarto-dark .cell-output pre {
  border-left: 4px solid #10b981;
}

[data-quarto-color-scheme="dark"] :not(pre) > code,
body.quarto-dark :not(pre) > code {
  background-color: var(--background-tertiary);
  color: #a3bffa;
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

[data-quarto-color-scheme="dark"] pre.sourceCode button.code-copy,
[data-quarto-color-scheme="dark"] .cell-output pre button.code-copy,
[data-quarto-color-scheme="dark"] div.sourceCode button.code-copy,
body.quarto-dark pre.sourceCode button.code-copy,
body.quarto-dark .cell-output pre button.code-copy,
body.quarto-dark div.sourceCode button.code-copy {
  background: var(--background-secondary);
  color: var(--text);
  border: 1px solid var(--border);
}
[data-quarto-color-scheme="dark"] pre.sourceCode button.code-copy:hover,
body.quarto-dark pre.sourceCode button.code-copy:hover {
  background: var(--background-tertiary);
  border-color: #10b981;
}

/* Tables */
[data-quarto-color-scheme="dark"] table,
body.quarto-dark table {
  background-color: var(--background-secondary);
  border-color: var(--border);
}
[data-quarto-color-scheme="dark"] th,
[data-quarto-color-scheme="dark"] td,
body.quarto-dark th,
body.quarto-dark td { border-color: var(--border); }
[data-quarto-color-scheme="dark"] thead,
body.quarto-dark thead { background-color: var(--background-tertiary); }

/* Images */
[data-quarto-color-scheme="dark"] img,
body.quarto-dark img { opacity: 0.9; filter: brightness(0.9) contrast(1.1); }

body.quarto-dark img[src$=".svg"] { filter: invert(1) hue-rotate(180deg) brightness(1.5); }

/* Listing text */
[data-quarto-color-scheme="dark"] .quarto-listing-container-default .listing-author,
[data-quarto-color-scheme="dark"] .quarto-listing-container-default .listing-date,
body.quarto-dark .quarto-listing-container-default .listing-author,
body.quarto-dark .quarto-listing-container-default .listing-date {
  color: var(--muted);
}

/* ============================================================
   MOBILE
   ============================================================ */

@media (max-width: 768px) {
  .nav-footer .nav-footer-left,
  .nav-footer .nav-footer-right,
  div.nav-footer-left,
  div.nav-footer-right {
    display: none;
    height: 0;
    margin: 0;
    padding: 0;
    min-height: 0;
  }

  .nav-footer {
    flex-direction: column;
    padding: 0;
  }

  .nav-footer .nav-footer-center {
    width: 100%;
    padding: 0.85rem 1rem;
  }

  .navbar { padding-top: 0.5rem; padding-bottom: 0.5rem; }

  .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
  }

  .navbar-toggler {
    border-color: rgba(255, 255, 255, 0.3);
    background-color: var(--primary);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    -webkit-tap-highlight-color: transparent;
  }

  .navbar-toggler:focus {
    box-shadow: 0 0 0 0.25rem rgba(255, 255, 255, 0.4);
    outline: none;
    border-radius: 8px;
  }
  .navbar-toggler:-moz-focusring { outline: none; }

  .navbar-collapse {
    background-color: var(--primary);
    padding: 10px;
    border-radius: 8px;
    margin-top: 10px;
    max-width: 160px;
    margin-right: auto;
  }

  .navbar-nav .nav-item { border-bottom: 1px solid rgba(255, 255, 255, 0.3); }
  .navbar-nav .nav-item:last-child { border-bottom: none; }

  .quarto-listing-cols > div .listing-item img,
  .quarto-post .thumbnail img,
  .listing-item .thumbnail img {
    aspect-ratio: 9 / 4 !important;
    width: 100%;
    height: auto;
    object-fit: cover;
    object-position: center;
    border-radius: 8px;
    margin-bottom: 10px;
  }

  .math.display,
  .katex-display,
  .mjx-container {
    text-align: left;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 10px 0;
    display: block;
    width: 100%;
  }
  .math.display { padding-left: 10px !important; }

  pre.sourceCode, code.sourceCode {
    white-space: pre;
    overflow-x: auto;
    word-break: normal;
    display: block;
    width: 100%;
  }

  pre.sourceCode::-webkit-scrollbar { height: 4px; }
  pre.sourceCode::-webkit-scrollbar-thumb {
    background: rgba(90, 103, 216, 0.5);
    border-radius: 10px;
  }

  .quarto-container table,
  .table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-collapse: collapse;
  }
  .quarto-container table th,
  .quarto-container table td {
    white-space: nowrap;
    padding: 8px 12px;
    font-size: 0.85rem;
  }
}