/* site.css — the whole look of francisco-kim.github.io.
   Org exports semantic HTML (org-html-head-include-default-style is nil in
   build-site.el, so this file owns every rule). Layout contract: prose sits in
   a readable centred column (--prose); figures, scores, plots and tables may
   use the full window width. */

:root {
  --prose: 850px;
  --header-h: 3.25rem;
  --bg: #faf8f4;
  --ink: #211d1a;
  --muted: #6f675f;
  --accent: #7a2e2e;
  --accent-dark: #571f1f;
  --rule: #e3ddd3;
  --code-bg: #f2eee6;
  --serif: "Charter", "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "DejaVu Sans Mono", monospace;
}

* { box-sizing: border-box; }

html {
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
}

/* ---------- Site header (org-html-preamble in build-site.el) ---------- */

#preamble {
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
  font-family: var(--sans);
}

.site-nav {
  max-width: var(--prose);
  margin: 0 auto;
  padding: 0 1.25rem;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-name {
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
}

.site-links {
  display: flex;
  gap: 1.4rem;
}

.site-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
}

.site-name:hover,
.site-links a:hover {
  color: var(--accent);
}

/* ---------- Content column ---------- */

#content {
  padding: 2.5rem 1.25rem 4rem;
}

/* Prose lives in a centred column; block elements that hold text share it. */
#content p,
#content ul,
#content ol,
#content dl,
#content blockquote,
#content .org-src-container,
#content pre.example,
#content h1,
#content h2,
#content h3,
#content h4,
#content h5,
#content h6 {
  max-width: var(--prose);
  margin-inline: auto;
}

/* ---------- Headings & text ---------- */

h1.title {
  font-size: 2.1rem;
  line-height: 1.2;
  font-weight: 700;
  margin: 0 auto 0.5rem;
}

h1.title + .subtitle { color: var(--muted); }

h2 { font-size: 1.55rem; margin-top: 2.6rem; }
h3 { font-size: 1.25rem; margin-top: 2rem; }
h4, h5, h6 { font-size: 1.05rem; margin-top: 1.6rem; }

h2, h3, h4, h5, h6 {
  font-weight: 650;
  line-height: 1.25;
}

.section-number-2, .section-number-3, .section-number-4, .section-number-5 {
  color: var(--muted);
  font-weight: 500;
  margin-right: 0.35em;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent);
  text-underline-offset: 2px;
}

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

blockquote {
  border-left: 3px solid var(--rule);
  padding-left: 1.1rem;
  color: var(--muted);
  font-style: italic;
}

hr {
  border: none;
  border-top: 1px solid var(--rule);
  max-width: var(--prose);
  margin: 2.5rem auto;
}

audio {
  display: block;
  width: 100%;
  max-width: var(--prose);
  margin: 1.2rem auto;
}

/* ---------- Figures & images (may exceed the prose column) ---------- */

.figure {
  text-align: center;
  margin: 2.2rem auto;
}

#content .figure p {
  max-width: none;
}

/* Images may exceed the prose column a little, but stay close to it:
   full-window-width figures make the surrounding text uncomfortable to read. */
.figure img,
#content img {
  max-width: min(100%, 960px);
  height: auto;
}

.figure-number,
.table-number,
.figure p:last-child {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
}

/* Call-to-action link ("Read the full analysis …") rendered as a button. */
a.cta {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #fff;
  background: var(--accent);
  padding: 0.55rem 1.15rem;
  border-radius: 6px;
  text-decoration: none;
}

a.cta:hover {
  background: var(--accent-dark);
  color: #fff;
}

/* Clickable preview of a PDF (links to the full document), centred on the
   text column and sized like one page of the score pair on the home page. */
.pdf-thumb {
  display: block;
  width: min(420px, 100%);
  margin-inline: auto;
  border: 1px solid var(--rule);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

/* Images wrapped by the click-to-zoom script in common.setup. */
.img-zoom img { cursor: zoom-in; }

/* Contact row under the homepage intro. */
.contact-links {
  font-family: var(--sans);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

.contact-links svg {
  vertical-align: -2px;
  margin-right: 0.35em;
}

.contact-links a {
  color: var(--accent);
  text-decoration: none;
}

.contact-links a:hover { text-decoration: underline; }

/* Two score pages shown side by side (stacking on narrow screens); each
   links to the full-size image. */
.score-pair {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  max-width: var(--prose);
  margin: 1.6rem auto;
}

.score-pair a {
  flex: 1 1 300px;
  min-width: 0;
}

.score-pair img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

/* ---------- Tables (may exceed the prose column) ---------- */

table {
  margin: 1.8rem auto;
  border-collapse: collapse;
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
}

caption {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

th, td {
  padding: 0.35rem 0.8rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

thead th, th {
  font-family: var(--sans);
  font-weight: 600;
  border-bottom: 2px solid var(--ink);
}

.org-right  { text-align: right; }
.org-left   { text-align: left; }
.org-center { text-align: center; }

/* ---------- Code (htmlize exports class-based highlighting) ---------- */

code, kbd, samp {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--code-bg);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

pre {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
}

.org-src-container { margin: 1.4rem auto; }
.org-src-container pre { margin: 0; }

pre.example {
  background: transparent;
  border-left: 3px solid var(--rule);
  border-top: none; border-right: none; border-bottom: none;
  border-radius: 0;
  color: var(--muted);
}

/* htmlize faces (see org-html-htmlize-output-type 'css in build-site.el) */
.org-keyword           { color: #7a2e2e; font-weight: 600; }
.org-builtin           { color: #5b3a8e; }
.org-function-name     { color: #205e8c; }
.org-variable-name     { color: #7c5218; }
.org-string            { color: #3d6b35; }
.org-doc               { color: #3d6b35; font-style: italic; }
.org-constant          { color: #205e8c; }
.org-type              { color: #2a6f6f; }
.org-comment,
.org-comment-delimiter { color: #8f867c; font-style: italic; }
.org-operator          { color: inherit; }
.org-warning           { color: #a33a3a; font-weight: 600; }

/* ---------- Footnotes ---------- */

#footnotes {
  max-width: var(--prose);
  margin: 3rem auto 0;
  font-size: 0.92rem;
  color: var(--muted);
}

h2.footnotes {
  font-size: 1.1rem;
  border-top: 1px solid var(--rule);
  padding-top: 1.2rem;
}

.footpara { display: inline; }
.footdef  { margin-bottom: 0.5rem; }
sup { line-height: 0; }

/* ---------- MathJax: centre display equations on the text column ---------- */

mjx-container[display="true"] {
  max-width: var(--prose);
  margin-inline: auto !important;
  overflow-x: auto;
  overflow-y: hidden;
}

/* ---------- Table of contents ----------
   Narrow screens: collapsed by default, the heading toggles .toc-open
   (tiny script in common.setup). Wide screens: fixed sidebar left of the
   text column, always expanded. */

/* On narrow screens (no room for the sidebar) the TOC is a collapsed,
   tap-to-expand control — boxed so it clearly looks tappable. */
#table-of-contents {
  max-width: var(--prose);
  margin: 0 auto 2rem;
  font-family: var(--sans);
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--code-bg);
  padding: 0.7rem 1rem;
}

#table-of-contents h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  margin: 0;
  cursor: pointer;
  user-select: none;
}

#table-of-contents.toc-open h2 { margin-bottom: 0.7rem; }

#table-of-contents h2::before {
  content: "▸ ";
  display: inline-block;
  transition: transform 0.15s;
}

#table-of-contents.toc-open h2::before { transform: rotate(90deg); }

#text-table-of-contents { display: none; }
#table-of-contents.toc-open #text-table-of-contents { display: block; }

#text-table-of-contents ul {
  list-style: none;
  margin: 0;
  padding-left: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

#text-table-of-contents ul ul { padding-left: 1rem; }

#text-table-of-contents li { margin: 0.25rem 0; }

#text-table-of-contents a {
  color: var(--muted);
  text-decoration: none;
}

#text-table-of-contents a:hover { color: var(--accent); }

@media (min-width: 1360px) {
  /* Reserve the sidebar's width so full-width images/tables never run under it. */
  body:has(#table-of-contents) #content {
    margin-left: 290px;
  }

  #table-of-contents {
    position: fixed;
    left: 0;
    top: var(--header-h);
    width: 250px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    margin: 0;
    padding: 1.6rem 1.25rem 2rem;
    border: none;
    border-right: 1px solid var(--rule);
    border-radius: 0;
    background: transparent;
  }

  #table-of-contents h2 { margin-bottom: 0.6rem; }

  #table-of-contents h2 { cursor: default; }
  #table-of-contents h2::before { content: none; }
  #text-table-of-contents { display: block; }
}

/* ---------- Footer (org-html-postamble in build-site.el) ---------- */

#postamble {
  border-top: 1px solid var(--rule);
  margin-top: 2rem;
}

.site-footer {
  max-width: var(--prose);
  margin: 0 auto;
  padding: 1.4rem 1.25rem 2.2rem;
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--muted);
}

.site-footer p { margin: 0.2rem 0; }

.site-footer a { color: inherit; }

/* ---------- Small screens ---------- */

@media (max-width: 560px) {
  body { font-size: 1rem; }
  h1.title { font-size: 1.7rem; }
  .site-links { gap: 0.9rem; }
  .site-links a { font-size: 0.78rem; letter-spacing: 0.06em; }
}