/* ---- School Science Lessons: design tokens -------------------------- */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,600;9..144,700&display=swap');

:root {
  --md-primary-fg-color: #14614e;        /* eucalyptus green */
  --md-primary-fg-color--light: #3d8a75;
  --md-primary-fg-color--dark: #0c4638;
  --md-accent-fg-color: #b95f14;         /* warm ochre */
  --ssl-paper: #f7f4ec;                  /* aged-paper tint for cards/figures */
  --ssl-card-border: rgba(20, 97, 78, 0.18);
}

[data-md-color-scheme="slate"] {
  --ssl-paper: #23282e;
  --ssl-card-border: rgba(120, 190, 170, 0.25);
}

/* Headings in a warm editorial serif */
.md-typeset h1,
.md-typeset h2,
.md-typeset h3,
.md-typeset h4 {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.md-typeset h1 { color: var(--md-primary-fg-color); }
[data-md-color-scheme="slate"] .md-typeset h1 { color: #7fc4ae; }

/* Dense reference content: tighter paragraph rhythm */
.md-typeset p { margin: 0.35em 0; }
.md-typeset h2 { margin-top: 1.8em; }
.md-typeset h3 { margin-top: 1.2em; }

/* ---- Left sidebar: current section header --------------------------- */

@media screen and (min-width: 76.25em) {
  .md-nav--lifted > .md-nav__list > .md-nav__item--active > .md-nav__link {
    font-family: "Fraunces", Georgia, serif;
    font-size: 0.85rem;
    color: var(--md-primary-fg-color);
  }
  [data-md-color-scheme="slate"] .md-nav--lifted > .md-nav__list
    > .md-nav__item--active > .md-nav__link {
    color: #7fc4ae;
  }
}

/* ---- Left sidebar: make the current page unmistakable ---------------- */

.md-nav .md-nav__link--active,
.md-nav .md-nav__link--active code {
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 0.25em;
  text-decoration-thickness: 2px;
  color: var(--md-primary-fg-color);
}
[data-md-color-scheme="slate"] .md-nav .md-nav__link--active {
  color: #7fc4ae;
}

/* ---- Figures (John's diagrams, inlined) ----------------------------- */

.ssl-figure {
  margin: 1rem auto;
  padding: 0.8rem 0.8rem 0.5rem;
  max-width: min(560px, 100%);
  background: var(--ssl-paper);
  border: 1px solid var(--ssl-card-border);
  border-radius: 10px;
  text-align: center;
}
.ssl-figure img {
  max-width: 100%;
  height: auto;
  background: #ffffff;
  border-radius: 4px;
}
.ssl-figure figcaption {
  font-size: 0.72rem;
  margin-top: 0.4rem;
  color: var(--md-default-fg-color--light);
  font-style: italic;
}

/* ---- Tables from legacy content -------------------------------------
   Tables size to their content and shrink (wrapping cell text) up to the
   page width; the wrapper only scrolls when a table genuinely cannot fit. */

.md-typeset .ssl-table-wrap { overflow-x: auto; }
.md-typeset table.ssl-table {
  display: table;
  width: max-content;
  max-width: 100%;
  border-collapse: collapse;
  font-size: 0.72rem;
}
.md-typeset table.ssl-table td,
.md-typeset table.ssl-table th {
  border: 1px solid var(--ssl-card-border);
  padding: 0.25rem 0.6rem;
}

/* Images anywhere in content shrink to fit rather than overflow */
.md-typeset img { max-width: 100%; height: auto; }

/* Links in running text are underlined (accessibility: never rely on
   colour alone). Navigation, cards, ToC etc. stay underline-free. */
.md-typeset p a,
.md-typeset li a,
.md-typeset td a,
.md-typeset th a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: rgba(20, 97, 78, 0.45);
}
.md-typeset p a:hover,
.md-typeset li a:hover,
.md-typeset td a:hover,
.md-typeset th a:hover {
  text-decoration-color: currentColor;
}
[data-md-color-scheme="slate"] .md-typeset p a,
[data-md-color-scheme="slate"] .md-typeset li a,
[data-md-color-scheme="slate"] .md-typeset td a,
[data-md-color-scheme="slate"] .md-typeset th a {
  text-decoration-color: rgba(127, 196, 174, 0.5);
}
/* ...but not the tiny "source" popups' neighbours or figure image links */
.md-typeset .ssl-figure a,
.md-typeset .ssl-src { text-decoration: none; }

/* Leading enumeration markers ("1.", "2a.", "(a)") in body lines */
.md-typeset b.ssl-num {
  font-size: 1.12em;
  font-weight: 700;
}

/* Page-top shortcut index, collapsed by default ------------------------ */

.md-typeset details.ssl-quicklinks {
  border: 1px solid var(--ssl-card-border);
  border-radius: 10px;
  background: var(--ssl-paper);
  padding: 0.4rem 0.9rem;
  margin: 0.8rem 0 1.2rem;
}
.md-typeset details.ssl-quicklinks summary {
  cursor: pointer;
  font-family: "Fraunces", Georgia, serif;
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--md-primary-fg-color);
}
[data-md-color-scheme="slate"] .md-typeset details.ssl-quicklinks summary {
  color: #7fc4ae;
}
.md-typeset details.ssl-quicklinks[open] {
  padding-bottom: 0.7rem;
}
.md-typeset details.ssl-quicklinks p {
  margin: 0.15rem 0;
  font-size: 0.72rem;
}
@media screen and (min-width: 60em) {
  .md-typeset details.ssl-quicklinks[open] > p:first-of-type,
  .md-typeset details.ssl-quicklinks[open] {
    column-width: 15rem;
    column-gap: 2rem;
  }
  .md-typeset details.ssl-quicklinks[open] summary {
    column-span: all;
    margin-bottom: 0.4rem;
  }
}

/* Chemical-formula lines: "source" reveals John's original text -------- */

.md-typeset .ssl-src {
  position: relative;
  font-size: 0.58rem;
  color: var(--md-default-fg-color--lighter);
  cursor: help;
  margin-left: 0.35em;
  border-bottom: 1px dotted var(--md-default-fg-color--lighter);
  user-select: none;
}
.md-typeset .ssl-src:hover,
.md-typeset .ssl-src:focus {
  color: var(--md-accent-fg-color);
}
.md-typeset .ssl-src:hover::after,
.md-typeset .ssl-src:focus::after {
  content: attr(data-src);
  position: absolute;
  left: 0;
  bottom: 1.6em;
  z-index: 20;
  width: max-content;
  max-width: min(34rem, 80vw);
  padding: 0.5em 0.8em;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  border: 1px solid var(--ssl-card-border);
  border-radius: 8px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.62rem;
  white-space: pre-wrap;
}

/* "Experiments" pseudo-headings inside sections */
.md-typeset .ssl-minihead {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 700;
  font-size: 0.85rem;
  margin-top: 1.1em;
  color: var(--md-primary-fg-color);
}
[data-md-color-scheme="slate"] .md-typeset .ssl-minihead { color: #7fc4ae; }

/* ---- Per-page provenance footer ------------------------------------- */

.ssl-source {
  margin-top: 2.5rem;
  padding-top: 0.8rem;
  border-top: 1px dashed var(--ssl-card-border);
  font-size: 0.7rem;
  color: var(--md-default-fg-color--light);
}

/* ---- Landing page ---------------------------------------------------- */

.ssl-hero {
  text-align: center;
  padding: 2.5rem 0 1.5rem;
}
.ssl-hero h1 {
  font-family: "Fraunces", Georgia, serif;
  font-size: 2.6rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  color: var(--md-primary-fg-color);
}
[data-md-color-scheme="slate"] .ssl-hero h1 { color: #7fc4ae; }
.ssl-hero p.ssl-tagline {
  font-size: 1.05rem;
  max-width: 34rem;
  margin: 0 auto;
  color: var(--md-default-fg-color--light);
}
.ssl-stats {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
  margin: 1.6rem 0 0.5rem;
}
.ssl-stats .ssl-stat { text-align: center; }
.ssl-stats .ssl-stat b {
  display: block;
  font-family: "Fraunces", Georgia, serif;
  font-size: 1.6rem;
  color: var(--md-primary-fg-color);
}
[data-md-color-scheme="slate"] .ssl-stats .ssl-stat b { color: #7fc4ae; }
.ssl-stats .ssl-stat span {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--md-default-fg-color--light);
}

/* Visitor counter at the bottom of the home page */
.md-typeset .ssl-counter {
  text-align: center;
  margin: 1.6rem 0 0.4rem;
  font-size: 0.72rem;
}
.md-typeset .ssl-counter a { color: var(--md-default-fg-color--light) !important; }
.md-typeset .ssl-counter img {
  height: 1.6rem;
  vertical-align: middle;
  margin-right: 0.4rem;
}

/* Recently updated list on the home page */
.md-typeset h2.ssl-updates-title {
  margin-top: 2rem;
  margin-bottom: 0.2rem;
}
.md-typeset .ssl-updates-note {
  color: var(--md-default-fg-color--light);
  font-size: 0.75rem;
  margin: 0 0 0.8rem;
}
.ssl-updates {
  max-height: 17rem;
  overflow-y: auto;
  border: 1px solid var(--ssl-card-border);
  border-radius: 12px;
  background: var(--md-default-bg-color);
  margin-bottom: 1.5rem;
}
.md-typeset a.ssl-update {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: 0.45rem 1rem;
  color: var(--md-default-fg-color) !important;
  border-bottom: 1px solid var(--ssl-card-border);
  font-size: 0.75rem;
}
.md-typeset a.ssl-update:last-child { border-bottom: 0; }
.md-typeset a.ssl-update:hover {
  background: var(--ssl-paper);
  color: var(--md-primary-fg-color) !important;
}
.md-typeset a.ssl-update time {
  flex: 0 0 6.2rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.68rem;
  color: var(--md-primary-fg-color);
  white-space: nowrap;
}
[data-md-color-scheme="slate"] .md-typeset a.ssl-update time { color: #7fc4ae; }

.ssl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
a.ssl-card {
  display: block;
  border: 1px solid var(--ssl-card-border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color) !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
a.ssl-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 18px rgba(20, 97, 78, 0.18);
}
.ssl-card .ssl-card-img {
  aspect-ratio: 16 / 10;
  background: var(--ssl-paper);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.ssl-card .ssl-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  mix-blend-mode: multiply;   /* lets the paper tint show through engravings */
}
[data-md-color-scheme="slate"] .ssl-card .ssl-card-img img {
  mix-blend-mode: normal;
}
.ssl-card .ssl-card-img .ssl-card-glyph {
  font-family: "Fraunces", Georgia, serif;
  font-size: 3rem;
  color: var(--md-primary-fg-color);
  opacity: 0.55;
}
.ssl-card .ssl-card-body {
  padding: 0.7rem 0.9rem 0.9rem;
}
.ssl-card .ssl-card-body b {
  font-family: "Fraunces", Georgia, serif;
  font-size: 0.95rem;
}
.ssl-card .ssl-card-body span {
  display: block;
  font-size: 0.72rem;
  color: var(--md-default-fg-color--light);
  margin-top: 0.15rem;
}