/* === Base (paper + ink) === */
body {
  max-width: 720px;
  margin: 2em auto;
  padding: 0 1.2em;
  line-height: 1.7;

  background-color: #f7f3e8; /* warm paper */
  color: #2c2a28;            /* soft ink */

  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               "Hiragino Mincho ProN", "Yu Mincho", serif;
}

/* === Headings === */
h1, h2, h3, h4 {
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  color: #1f1c1a;
  letter-spacing: 0.02em;
}

h1 {
  font-size: 2em;
  border-bottom: 2px solid #b23a2b; /* muted vermillion */
  padding-bottom: 0.3em;
  margin-top: 1.5em;
}

h2 {
  font-size: 1.5em;
  border-left: 4px solid #b23a2b;
  padding-left: 0.5em;
  margin-top: 1.8em;
}

h3 {
  font-size: 1.2em;
  margin-top: 1.5em;
}

/* === Paragraphs === */
p {
  margin: 0.7em 0;
}

/* === Links === */
a {
  color: #8c2f39; /* deep faded red */
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 47, 57, 0.4);
}

a:hover {
  color: #b23a2b;
  border-bottom: 1px solid #b23a2b;
}

/* === Lists === */
ul, ol {
  padding-left: 1.4em;
  margin: 0.8em 0;
}

li {
  margin: 0.3em 0;
}

/* === Code === */
code {
  background: #eee7d8;
  padding: 0.15em 0.35em;
  border-radius: 4px;
  font-size: 0.95em;
}

pre {
  background: #eee7d8;
  padding: 1em;
  border-radius: 6px;
  overflow-x: auto;
  border: 1px solid #ddd2b6;
}

/* === Blockquotes === */
blockquote {
  border-left: 3px solid #b23a2b;
  padding-left: 1em;
  margin: 1.2em 0;
  color: #5a5652;
  font-style: italic;
}

/* === Tables === */
table {
  border-collapse: collapse;
  margin: 1.2em 0;
  width: 100%;
  font-size: 0.95em;
}

th, td {
  border: 1px solid #d8ccb0;
  padding: 0.5em 0.7em;
}

th {
  background: #efe6d3;
}

/* === Horizontal rule === */
hr {
  border: none;
  border-top: 1px solid #d8ccb0;
  margin: 2em 0;
}

/* === Org-specific tweaks === */

/* TODO / DONE keywords */
.todo {
  color: #b23a2b;
  font-weight: bold;
}

.done {
  color: #4a6b50;
  font-weight: bold;
}

/* Tags */
.tag {
  background: #e8dcc7;
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.8em;
}

/* Source block label */
.org-src-name {
  font-size: 0.85em;
  color: #6b645c;
  margin-bottom: 0.2em;
}

/* Footnotes */
.footpara {
  font-size: 0.9em;
  color: #5a5652;
}

/* === Subtle fade-in (optional polish) === */
body {
  animation: fadeIn 0.4s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* === Collapsible TOC (pure CSS) === */

.toc-wrapper {
  background: #efe6d3;
  border: 1px solid #d8ccb0;
  border-radius: 6px;
  padding: 0.6em 0.8em;
  margin: 1.5em 0;
}

.toc-wrapper summary {
  cursor: pointer;
  font-weight: bold;
  color: #8c2f39;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  outline: none;
}

.toc-wrapper[open] summary {
  margin-bottom: 0.5em;
}

/* TOC list styling */
.toc-wrapper ul {
  margin: 0.4em 0;
  padding-left: 1.2em;
}

.toc-wrapper li {
  margin: 0.25em 0;
}

/* Optional: subtle hover */
.toc-wrapper a:hover {
  text-decoration: underline;
}