/* Styles for the reproducible-research tutorial pages.
 *
 * Two halves: (1) the .tutorial-body reading frame — the site's standard
 * body type (AvenirLTStd-Book at 20px/30px, per _sass/_type.scss) with
 * Cormorant display headings, on a wider measure to fit code; (2) the
 * interactive .pycell components, ported from torchlette's app.css (MIT),
 * whose palette already echoes this site. */

/* The site declares this face in assets/css/main.css, but head-dark pages
 * (this layout included) load only i.css — so declare it here too. URLs are
 * relative: ../fonts/ resolves to assets/fonts/. */
@font-face {
  font-family: 'AvenirLTStd-Book';
  src: url('../fonts/AvenirLTStd-Book_gdi.eot');
  src: url('../fonts/AvenirLTStd-Book_gdi.eot?#iefix') format('embedded-opentype'),
    url('../fonts/AvenirLTStd-Book_gdi.woff') format('woff'),
    url('../fonts/AvenirLTStd-Book_gdi.ttf') format('truetype'),
    url('../fonts/AvenirLTStd-Book_gdi.svg#AvenirLTStd-Book') format('svg');
  font-weight: normal;
  font-style: normal;
}

:root {
  --t-bg: #ffffff;
  --t-bg-soft: #f5f3ed;
  --t-bg-code: #1d1f21; /* Tomorrow Night background */
  --t-fg: #1a1a1a;
  --t-fg-muted: #aaaaaa;
  --t-fg-meta: #666666;
  --t-border: #eeeeee;
  --t-link: #569BBB;   /* site $link */
  --t-accent: #eebb66; /* site $highlight */
  --t-accent-hover: #dba049;
  --t-red: #aa0000;
  --t-sans: AvenirLTStd-Book, Avenir, "Avenir Next", -apple-system,
    BlinkMacSystemFont, Helvetica, Arial, sans-serif;
  --t-mono: Monaco, ui-monospace, "JetBrains Mono", "SF Mono",
    "Courier New", monospace;
}

/* ── reading frame ─────────────────────────────────────────────────────── */

/* Tutorial pages drop the site chrome (name, nav, mail) for a quieter
 * reading frame; the layout sets body_class: tutorial-page. */
.tutorial-page .site-header { display: none; }

.tutorial-body {
  max-width: 720px;
  margin: 0 auto;
  font-family: var(--t-sans);
  font-size: 20px;
  line-height: 30px;
  color: var(--t-fg);
}

.tutorial-body .post-header {
  margin-bottom: 2.4em;
}

.tutorial-body .post-header h1 {
  font-family: "Cormorant", Georgia, serif;
  font-weight: 600;
  font-size: 46px;
  line-height: 1.15;
  margin-bottom: 0;
}

.tutorial-body h2 {
  font-family: "Cormorant", Georgia, serif;
  font-weight: 600;
  font-size: 32px;
  line-height: 1.2;
  margin: 2.2em 0 0.5em;
}

.tutorial-body h3 {
  font-family: "Cormorant", Georgia, serif;
  font-weight: 600;
  font-size: 25px;
  line-height: 1.25;
  margin: 1.8em 0 0.4em;
}

.tutorial-body a {
  color: var(--t-link);
  text-decoration: none;
  border-bottom: 1px solid rgba(86, 155, 187, 0.35);
}
.tutorial-body a:hover { border-bottom-color: var(--t-link); }

.tutorial-body p { margin: 0 0 1em; }
.tutorial-body ul, .tutorial-body ol { margin: 0 0 1em; padding-left: 1.4em; }
.tutorial-body li { margin-bottom: 0.35em; }

.tutorial-body blockquote {
  margin: 1.4em 0;
  padding-left: 1.2em;
  border-left: 3px solid var(--t-accent);
  font-style: italic;
  color: #444;
}
.tutorial-body blockquote cite {
  display: block;
  margin-top: 0.4em;
  font-style: normal;
  font-size: 0.85em;
  color: var(--t-fg-meta);
}

.tutorial-body code {
  font-family: var(--t-mono);
  font-size: 0.78em;
  background: var(--t-bg-soft);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

.tutorial-body pre {
  background: var(--t-bg-soft);
  border: 1px solid var(--t-border);
  border-radius: 6px;
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  font-family: var(--t-mono);
  font-size: 15px;
  line-height: 1.55;
  margin: 0 0 1.2em;
}
.tutorial-body pre code {
  background: none;
  padding: 0;
  font-size: inherit;
  font-weight: normal;
  color: var(--t-fg);
}

/* Rouge (the GitHub Pages build) wraps fenced code as
 * div.highlight > pre.highlight > code, and the site-wide theme in i.css
 * styles .highlight as a dark block: black background, 12px padding, white
 * code, light token colors. On top of the tan pre above, that rendered as
 * white-on-tan inside a black frame. Neutralize the wrapper and recolor
 * the tokens for this light frame. (div.highlight, not .highlight: Rouge
 * puts the class on the pre too, whose look .tutorial-body pre defines.) */
.tutorial-body div.highlight {
  background: none;
  padding: 0;
  margin: 0;
  border-radius: 0;
  overflow-x: visible;
}
.tutorial-body .highlight code { color: var(--t-fg); }

/* Token palette: site-adjacent hues, ≥4.5:1 contrast on --t-bg-soft. */
.tutorial-body .highlight .c,
.tutorial-body .highlight .c1,
.tutorial-body .highlight .cm,
.tutorial-body .highlight .ch,
.tutorial-body .highlight .lineno { color: var(--t-fg-meta); font-style: italic; }
.tutorial-body .highlight .k,
.tutorial-body .highlight .kn,
.tutorial-body .highlight .kd,
.tutorial-body .highlight .kr,
.tutorial-body .highlight .nt { color: #24536b; font-weight: bold; } /* site $accent */
.tutorial-body .highlight .s,
.tutorial-body .highlight .s1,
.tutorial-body .highlight .s2,
.tutorial-body .highlight .sb,
.tutorial-body .highlight .sh,
.tutorial-body .highlight .si,
.tutorial-body .highlight .sd { color: #8a4d0f; } /* dark amber, kin to --t-accent */
.tutorial-body .highlight .m,
.tutorial-body .highlight .mf,
.tutorial-body .highlight .mi { color: #106e63; }
.tutorial-body .highlight .nb,
.tutorial-body .highlight .nf,
.tutorial-body .highlight .nl,
.tutorial-body .highlight .nn,
.tutorial-body .highlight .nv,
.tutorial-body .highlight .na,
.tutorial-body .highlight .py { color: #445588; }
.tutorial-body .highlight .err { color: inherit; background: none; }

.tutorial-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4em 0;
  font-family: var(--t-sans);
  font-size: 15px;
  line-height: 1.45;
}
.tutorial-body th {
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--t-fg);
  padding: 0.4em 0.7em 0.4em 0;
}
.tutorial-body td {
  border-bottom: 1px solid var(--t-border);
  padding: 0.45em 0.7em 0.45em 0;
  vertical-align: top;
}

.tutorial-body hr {
  border: none;
  border-top: 1px solid var(--t-border);
  margin: 2.5em auto;
  width: 40%;
}

/* Small-caps section kicker, e.g. "Part 2" */
.tutorial-kicker {
  font-family: var(--t-sans);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--t-fg-meta);
  display: block;
  margin-bottom: 0.2em;
}

/* Main-page section link lists */
.tutorial-body .section-links {
  list-style: none;
  padding-left: 0;
}
.tutorial-body .section-links > li {
  margin-bottom: 0.55em;
  padding-left: 1.3em;
  text-indent: -1.3em;
}
.tutorial-body .section-links > li::before {
  content: "→";
  color: var(--t-accent-hover);
  padding-right: 0.55em;
}

/* Group-discussion questions at the end of each part */
.tutorial-discussion {
  border: 1px solid var(--t-border);
  border-left: 3px solid var(--t-link);
  border-radius: 0 6px 6px 0;
  padding: 1.1rem 1.5rem 0.9rem;
  margin: 2.2em 0;
}
.tutorial-discussion h2 {
  margin: 0 0 0.5em;
  font-size: 26px;
}
.tutorial-discussion ol { margin-bottom: 0.4em; }
.tutorial-discussion li { margin-bottom: 0.6em; }

/* Callout box for teaching asides */
.tutorial-callout {
  background: var(--t-bg-soft);
  border-left: 3px solid var(--t-accent);
  border-radius: 0 6px 6px 0;
  padding: 0.9rem 1.2rem;
  margin: 1.5em 0;
  font-size: 0.92em;
}
.tutorial-callout > :last-child { margin-bottom: 0; }

/* Disclosure for lab answers and expected output */
.tutorial-body details {
  margin: 1em 0 1.5em;
  border: 1px solid var(--t-border);
  border-radius: 6px;
  padding: 0.55rem 1rem;
  font-size: 0.95em;
}
.tutorial-body details summary {
  cursor: pointer;
  font-family: var(--t-sans);
  font-size: 14px;
  color: var(--t-fg-meta);
}
.tutorial-body details[open] summary { margin-bottom: 0.6rem; }

/* ── pycell: the interactive unit ──────────────────────────────────────── */

.pycell {
  margin: 1.6em 0 2em;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.editor-frame { position: relative; }

.cm-host {
  border: 1px solid var(--t-border);
  border-radius: 6px;
  overflow: hidden;
  font-size: 0.9rem;
  background: var(--t-bg-code);
}
.cm-host .cm-editor { padding: 0.25rem 0; }
/* Chunky accent caret. CodeMirror's base theme sets a hairline black caret;
 * override width and recentre. !important defends against base-theme
 * regeneration when extensions reorder. */
.cm-host .cm-cursor,
.cm-host .cm-dropCursor {
  border-left-width: 3px !important;
  border-left-color: var(--t-accent) !important;
  margin-left: -1.5px !important;
}

/* Scoped under .tutorial-body so the dark background outranks the tan
 * .tutorial-body pre above — unscoped, that rule wins and renders this
 * light-gray text on tan. */
.tutorial-body .pycell-fallback-code {
  background: var(--t-bg-code);
  color: #c5c8c6;
  border-radius: 6px;
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  font-family: var(--t-mono);
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 0;
}

.pycell-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--t-sans);
}

/* The .btn display rule would otherwise defeat the hidden attribute. */
.pycell-actions [hidden] { display: none !important; }

.pycell-fresh-note {
  font-size: 12.5px;
  color: var(--t-fg-muted);
  font-style: italic;
  margin-right: auto;
}

/* Run button, ported intact: fixed geometry so idle, hover, running, and
 * disabled states are byte-for-byte identical in size. */
.btn {
  font-family: var(--t-sans);
  font-size: 0.9rem;
  padding: 0 1.2rem;
  background: transparent;
  color: var(--t-fg);
  border: 1.5px solid var(--t-fg);
  border-radius: 999px;
  cursor: pointer;
  min-width: 6rem;
  height: 2.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  line-height: 1;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    box-shadow 160ms ease;
}
.btn:hover {
  background: var(--t-fg);
  border-color: var(--t-fg);
  color: var(--t-bg);
}
.btn:active:not(:disabled) {
  box-shadow: inset 0 0 0 99px rgba(238, 187, 102, 0.25);
}
.btn:focus-visible {
  outline: 2px solid var(--t-accent);
  outline-offset: 2px;
}

.btn-running {
  cursor: progress;
  background: transparent;
  border-color: var(--t-fg);
  color: var(--t-fg);
  opacity: 0.65;
}
.btn-running:hover,
.btn-running:focus,
.btn-running:active:not(:disabled) {
  background: transparent;
  border-color: var(--t-fg);
  color: var(--t-fg);
  box-shadow: none;
}
.btn-running-dots {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.btn-running-dots .dot {
  width: 6px;
  height: 6px;
  background: currentColor;
  border-radius: 50%;
  opacity: 0.25;
  transform: scale(0.85);
  animation: dot-wave 1.4s ease-in-out infinite;
}
.btn-running-dots .dot:nth-child(2) { animation-delay: 0.16s; }
.btn-running-dots .dot:nth-child(3) { animation-delay: 0.32s; }
@keyframes dot-wave {
  0%, 80%, 100% { opacity: 0.25; transform: scale(0.85); }
  40%           { opacity: 1;    transform: scale(1);    }
}

.btn-stop {
  min-width: 5rem;
  border-color: var(--t-red);
  color: var(--t-red);
}
.btn-stop:hover {
  background: var(--t-red);
  border-color: var(--t-red);
  color: #fff;
}

/* Output panel */
.output-panel {
  background: var(--t-bg-soft);
  color: var(--t-fg);
  border: 1px solid var(--t-border);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-family: var(--t-mono);
  font-size: 0.85rem;
  line-height: 1.55;
  min-height: 2.5rem;
  white-space: pre-wrap;
  overflow-x: auto;
  margin: 0;
}
.output-end-sentinel {
  display: block;
  height: 0;
  scroll-margin-bottom: 40vh;
}
.output-stderr { color: var(--t-red); }
.output-error { color: var(--t-red); display: block; margin-top: 0.5rem; }
.output-note { color: var(--t-fg-meta); font-style: italic; }

/* Expected-output disclosure attached to a cell */
.pycell-expected {
  margin: -0.5rem 0 0;
  border: 1px dashed var(--t-border);
  border-radius: 6px;
  padding: 0.45rem 0.9rem;
}
.pycell-expected summary {
  cursor: pointer;
  font-family: var(--t-sans);
  font-size: 13px;
  color: var(--t-fg-muted);
}
.pycell-expected pre {
  margin: 0.5rem 0 0.25rem;
  font-family: var(--t-mono);
  font-size: 0.8rem;
  white-space: pre-wrap;
}

/* Boot indicator pill */
.pycell-boot {
  position: fixed;
  bottom: 1.2rem;
  right: 1.2rem;
  z-index: 50;
  background: var(--t-bg-code);
  color: #f5f3ed;
  font-family: var(--t-sans);
  font-size: 13px;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
  animation: pycell-boot-in 300ms ease;
}
.pycell-boot-done { background: #2e5a2e; }
.pycell-boot-failed { background: var(--t-red); }
@keyframes pycell-boot-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 800px) {
  .tutorial-body { font-size: 18px; line-height: 27px; }
  .tutorial-body .post-header h1 { font-size: 36px; }
  .tutorial-body h2 { font-size: 27px; }
  .tutorial-body table { font-size: 13.5px; }
}

@media print {
  .pycell-actions, .pycell-boot { display: none; }
}