custom.scss

/*-- scss:functions --*/

// Latin subset only. Matches the ranges Google Fonts serves for `latin`,
// so the browser skips these files entirely for text outside the range.
$latin-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
  U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+2074, U+20AC, U+2122, U+2191,
  U+2193, U+2212, U+2215, U+FEFF, U+FFFD;

/*-- scss:defaults --*/

// Palette — mirrors _brand.yml so SCSS can reach the roles brand does not expose.
$paper:    #FDFBF7 !default;
$surface:  #F5F1E8 !default;
$rule:     #EAE3D8 !default;
$ink:      #1F1D1A !default;
$muted:    #6B6459 !default;
$oxblood:  #8A3446 !default;

$serif: "Fraunces", Georgia, "Times New Roman", serif;
$sans:  "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
$mono:  "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

// Measure. See spec §2 — the margin column collapses so body text is
// genuinely centred rather than centred-minus-a-gutter.
$measure: 640px;

$body-bg:    $paper;
$body-color: $ink;
$link-color: $oxblood;
$link-hover-color: darken($oxblood, 8%);
$border-color: $rule;

$font-family-sans-serif: $sans;
$font-family-monospace:  $mono;
$headings-font-family:   $serif;
$headings-font-weight:   600;

$navbar-bg: $paper;
$navbar-fg: $ink;
$navbar-hl: $oxblood;

$code-block-bg: $surface;
$code-color: $ink;

$toc-color: $ink;
$toc-active-border: $oxblood;

/*-- scss:rules --*/

// ---------------------------------------------------------------------------
// Fonts — declared here rather than via brand `fonts:` so the variable weight
// axis survives. Quarto's `source: file` hard-codes `font-weight: normal`,
// which would leave every heading faux-bolded.
// ---------------------------------------------------------------------------
@font-face {
  font-family: "Fraunces";
  src: url("/assets/fonts/Fraunces-normal-latin.woff2") format("woff2");
  font-weight: 300 900;
  font-style: normal;
  font-display: swap;
  unicode-range: $latin-range;
}
@font-face {
  font-family: "Fraunces";
  src: url("/assets/fonts/Fraunces-italic-latin.woff2") format("woff2");
  font-weight: 300 900;
  font-style: italic;
  font-display: swap;
  unicode-range: $latin-range;
}
@font-face {
  font-family: "Source Sans 3";
  src: url("/assets/fonts/SourceSans3-normal-latin.woff2") format("woff2");
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
  unicode-range: $latin-range;
}
@font-face {
  font-family: "Source Sans 3";
  src: url("/assets/fonts/SourceSans3-italic-latin.woff2") format("woff2");
  font-weight: 300 700;
  font-style: italic;
  font-display: swap;
  unicode-range: $latin-range;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/JetBrainsMono-normal-latin.woff2") format("woff2");
  font-weight: 400 600;
  font-style: normal;
  font-display: swap;
  unicode-range: $latin-range;
}

// ---------------------------------------------------------------------------
// Type
// ---------------------------------------------------------------------------
body {
  font-family: $sans;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6,
.quarto-title h1.title {
  font-family: $serif;
  font-variation-settings: "SOFT" 50, "WONK" 1;
  font-weight: 600;
  letter-spacing: -0.012em;
  line-height: 1.16;
}

// ---------------------------------------------------------------------------
// Navbar — paper-coloured with a single hairline, no Bootstrap slab.
// ---------------------------------------------------------------------------
.navbar {
  // Colour comes from $navbar-bg / $navbar-fg / $navbar-hl in defaults.
  border-bottom: 1px solid $rule;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;

  .navbar-brand {
    font-family: $serif;
    font-variation-settings: "SOFT" 40, "WONK" 1;
    font-weight: 600;
    letter-spacing: -0.005em;
  }

}

// ---------------------------------------------------------------------------
// Title blocks — banner replaced with date / title / hairline.
// ---------------------------------------------------------------------------
// `title-block-banner` is removed at source (blog/posts/_metadata.yml and both
// listing pages) rather than hidden here — in banner mode the title itself
// lives inside the banner, so hiding it hides the title too.

#title-block-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid $rule;

  // Date above the title, in letterspaced small caps.
  display: flex;
  flex-direction: column;

  .quarto-title-meta {
    order: -1;
    margin: 0 0 0.55rem;
    color: $muted;
    font-size: 0.72rem;
    letter-spacing: 0.13em;
    text-transform: uppercase;
    border: none;
    padding: 0;

    .quarto-title-meta-heading { display: none; }
    .quarto-title-meta-contents { display: inline; }
    > div { display: inline; }
  }

  .quarto-title h1.title {
    font-size: clamp(1.9rem, 4.2vw, 2.35rem);
    margin: 0 0 0.3rem;
  }

  .quarto-categories {
    margin-top: 0.6rem;
    gap: 0.55rem;

    .quarto-category {
      background: none;
      border: none;
      padding: 0;
      opacity: 1;
      color: $oxblood;
      font-size: 0.78rem;
      letter-spacing: 0.04em;
      text-transform: none;
    }
  }
}

// Bootstrap underlines h2 by default; the design uses space, not rules.
h2 {
  border-bottom: none;
  padding-bottom: 0;
  margin-top: 2.2rem;
}

.subtitle, p.subtitle {
  font-family: $sans;
  color: $muted;
  font-size: 1.02rem;
}

// ---------------------------------------------------------------------------
// Links, code, rules
// ---------------------------------------------------------------------------
a {
  color: $oxblood;
  text-decoration: none;
  border-bottom: 1px solid rgba($oxblood, 0.32);
  transition: border-color 0.18s ease;
  &:hover { border-bottom-color: $oxblood; }
}

.navbar a, .nav-link, a.quarto-grid-link, #TOC a, .anchorjs-link,
.no-rule, h1 a, h2 a, h3 a { border-bottom: none; }

code:not(.sourceCode) {
  color: $oxblood;
  background: $surface;
  padding: 0.1em 0.34em;
  border-radius: 3px;
  font-size: 0.88em;
}

div.sourceCode, pre.sourceCode {
  background: $surface;
  border: none;
  border-left: 2px solid $oxblood;
  border-radius: 0 3px 3px 0;
}

blockquote {
  border-left: 2px solid $rule;
  padding-left: 1.1rem;
  color: $muted;
  font-style: italic;
}

// ---------------------------------------------------------------------------
// Measure — `grid: margin-width: 0px` alone does not reclaim the track, so the
// body still sits left of centre. Span the full page and centre explicitly.
// ---------------------------------------------------------------------------
// Measure is Quarto's job: `grid: body-width` in _quarto.yml sets the
// body-content track, and the symmetric 5fr gutters either side centre it.
// Nothing needed here.

// ---------------------------------------------------------------------------
// Contents rail — pure CSS over Quarto's own TOC markup. Quarto's scroll-spy
// toggles `.active`; nothing here needs JavaScript.
// ---------------------------------------------------------------------------
// Quarto's stylesheet rules here are class-level (`.sidebar.margin-sidebar`),
// so an ID selector outranks them. The !important on top/max-height is not
// specificity: Quarto's JS writes `style="top: 66px; max-height: ..."` inline
// at runtime to clear the fixed navbar, and inline styles beat any selector.
#quarto-margin-sidebar {
  position: fixed;
  top: 50% !important;
  max-height: none !important;
  bottom: auto;
  right: 0;
  left: auto;
  transform: translateY(-50%);
  width: auto;
  max-width: 15rem;
  height: auto;
  z-index: 20;
  padding: 1.1rem 1.25rem 1.1rem 1rem;
  overflow: visible;

  // Frosted backing, so labels never sit unbacked on prose.
  &::before {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba($paper, 0.72);
    -webkit-backdrop-filter: blur(7px);
    backdrop-filter: blur(7px);
    border-left: 1px solid rgba($rule, 0.7);
    opacity: 0;
    transition: opacity 0.26s ease;
    pointer-events: none;
  }
  &:hover::before { opacity: 1; }

  // Without backdrop-filter a translucent panel is no panel at all.
  @supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    &::before { background: $paper; }
  }
}

nav#TOC {
  position: relative;
  z-index: 1;

  #toc-title {
    position: absolute;
    width: 1px; height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.62rem;
  }
  ul ul { margin-top: 0.62rem; }

  a.nav-link {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.62rem;
    padding: 0;
    border: none;
    font-size: 0.8rem;
    line-height: 1.3;
    white-space: nowrap;
    // Label invisible but still occupying width, so nothing reflows on reveal.
    color: transparent;
    transition: color 0.26s ease;

    &::after {
      content: "";
      display: block;
      flex: none;
      width: 0.95rem;
      height: 2px;
      border-radius: 2px;
      background: rgba($ink, 0.28);
      transition: width 0.26s ease, background-color 0.26s ease;
    }

    // Quarto colours the active TOC link; it must stay hidden until hover
    // like every other label, or one label floats unbacked over the prose.
    &.active {
      color: transparent !important;
      &::after {
        width: 1.65rem;
        background: $oxblood;
      }
    }
  }

  // h3 and below: shorter marks
  ul ul a.nav-link::after { width: 0.55rem; }
  ul ul a.nav-link.active::after { width: 1.1rem; }
}

#quarto-margin-sidebar:hover nav#TOC {
  a.nav-link { color: rgba($ink, 0.68) !important; }
  a.nav-link:hover { color: $ink !important; }
  a.nav-link.active { color: $oxblood !important; }
}

// Above 1200px the rail sits in empty margin, so it needs no backing.
@media (min-width: 1200px) {
  #quarto-margin-sidebar::before { display: none; }
}

// Quarto already hides #quarto-margin-sidebar below 900px, which is exactly
// the breakpoint the design wants — no rule needed here.

// ---------------------------------------------------------------------------
// Anchor motif — the favicon carried through the site. Hierarchy is by colour,
// not size: the end mark is the only accent-coloured anchor and the only one
// not sitting on a rule, so it reads as terminal against the grey structural
// marks above and below it. Drawn with mask-image so one shape serves all
// four uses and each can take its own colour.
// ---------------------------------------------------------------------------
$anchor-svg: "data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'%3E%3Cg fill='none' stroke='%23000' stroke-width='2.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='16' cy='6' r='2.9'/%3E%3Cpath d='M16 9 L16 27'/%3E%3Cpath d='M9.5 13 L22.5 13'/%3E%3Cpath d='M6 19 Q6 27.5 16 27.5 Q26 27.5 26 19'/%3E%3C/g%3E%3C/svg%3E";

// Background images cannot take currentColor, so bake the stroke colour into
// the data URI. Opacity is mixed against the paper rather than applied
// separately, which keeps it opaque and lets both palettes drive it.
// `mix()` returns rgb(...) with fractional channels, not a hex string, so
// interpolating it directly yielded `%23gb(177.52, ...)`. ie-hex-str always
// gives #AARRGGBB; drop the leading "#FF" to get the six hex digits.
@function anchor-url($colour) {
  $hex: str-slice(ie-hex-str($colour), 4);
  @return url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'%3E%3Cg fill='none' stroke='%23#{$hex}' stroke-width='2.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='16' cy='6' r='2.9'/%3E%3Cpath d='M16 9 L16 27'/%3E%3Cpath d='M9.5 13 L22.5 13'/%3E%3Cpath d='M6 19 Q6 27.5 16 27.5 Q26 27.5 26 19'/%3E%3C/g%3E%3C/svg%3E");
}

@mixin anchor-mark($size, $colour, $alpha) {
  content: "";
  display: block;
  flex: none;
  width: $size;
  height: $size;
  background-color: $colour;
  opacity: $alpha;
  -webkit-mask: url($anchor-svg) no-repeat center / contain;
  mask: url($anchor-svg) no-repeat center / contain;
}

// 1 — section break. Grey, on a rule. The two ::before/::after segments are
// the rule; the anchor is a centred background showing through the gap.
main.content hr {
  border: none;
  height: 1.1rem;
  opacity: 1;
  margin: 2.3rem 0;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  background: anchor-url(mix($ink, $paper, 34%)) no-repeat center / 0.88rem 0.88rem;

  &::before,
  &::after {
    content: "";
    flex: 1;
    height: 1px;
    background: $rule;
  }
}

// 2 — end of post. Accent, floating, no rule. Scoped by `body-classes: post`
// in blog/posts/_metadata.yml, so listings and standalone pages never get it.
body.post main.content::after {
  @include anchor-mark(1.2rem, $oxblood, 0.45);
  margin: 2.6rem auto 0.5rem;
}

// 3 — page footer. Grey, small, at the end of the footer rule.
.nav-footer::after {
  @include anchor-mark(0.62rem, $ink, 0.3);
}

// 4 — 404 watermark. Set on the page itself; see 404.qmd.
.error-watermark {
  @include anchor-mark(9.5rem, $ink, 0.06);
  position: absolute;
  right: 4vw;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

// ---------------------------------------------------------------------------
// Landing page and 404 — baseline poster. The wordmark sits on the baseline
// bottom-left; all the air above it is `.landing-stage`, reserved for the
// animation that comes later.
// ---------------------------------------------------------------------------
body.landing {
  main.content { max-width: none; padding-inline: clamp(1.2rem, 5vw, 4rem); }

  #title-block-header,
  #quarto-margin-sidebar { display: none; }

  .landing {
    position: relative;
    min-height: calc(100vh - 11rem);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
  }

  .landing-stage {
    display: block;
    flex: 1 1 auto;
    min-height: 2rem;
  }

  h1.wordmark {
    font-family: $serif;
    font-optical-sizing: none;
    font-variation-settings: "opsz" 144, "SOFT" 30, "WONK" 1;
    font-weight: 700;
    font-size: clamp(2.8rem, 13vw, 9rem);
    line-height: 0.94;
    letter-spacing: -0.042em;
    margin: 0;
    white-space: nowrap;
    border: none;

    .wm-tail {
      font-style: italic;
      font-weight: 400;
      color: $oxblood;
      font-variation-settings: "opsz" 144, "SOFT" 80, "WONK" 1;
    }
  }

  .tagline {
    display: block;
    margin-top: 1rem;
    color: $muted;
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
  }

  .error-home {
    display: inline-block;
    margin-top: 1.1rem;
    font-size: 0.92rem;
  }

  // Fraunces' figures at opsz 144 are so high-contrast that the 4's thin
  // diagonal all but disappears and the glyph reads as broken. Drop the
  // optical size and soften the terminals; WONK is a lettering axis and does
  // the numerals no favours either.
  &.error h1.wordmark {
    font-variation-settings: "opsz" 40, "SOFT" 60, "WONK" 0;
    font-variant-numeric: lining-nums;
    letter-spacing: -0.02em;

    .wm-tail { font-variation-settings: "opsz" 40, "SOFT" 90, "WONK" 0; }
  }

  // Below this the wordmark would overflow its line.
  @media (max-width: 26rem) {
    h1.wordmark { white-space: normal; }
  }
}

// ---------------------------------------------------------------------------
// Blog index — one line per post: date, title, categories. An archive rather
// than a feed. Posts carry a `subtitle` this layout deliberately drops.
// ---------------------------------------------------------------------------
.index-row {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid $rule;
}

.index-date {
  flex: none;
  width: 6.4rem;
  color: $muted;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.index-title {
  flex: 1;
  font-family: $serif;
  font-variation-settings: "SOFT" 45, "WONK" 1;
  font-weight: 600;
  font-size: 1.08rem;
  line-height: 1.3;
  letter-spacing: -0.012em;
  color: $ink;
  border-bottom: none;

  &:hover { color: $oxblood; }
}

.index-cats { flex: none; }

.index-cat {
  color: $oxblood;
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  margin-left: 0.5rem;
}

// The date column has nowhere to go on a phone; stack instead.
@media (max-width: 34rem) {
  .index-row { flex-direction: column; gap: 0.2rem; align-items: stretch; }
  .index-date { width: auto; }
  .index-cat { margin: 0 0.6rem 0 0; }
}

// ---------------------------------------------------------------------------
// Projects — stacked entries. No dates and no images, so the index row's left
// column would sit empty; the description gets its own line instead.
// ---------------------------------------------------------------------------
.stack-row {
  padding: 1rem 0;
  border-bottom: 1px solid $rule;
}

.stack-title {
  font-family: $serif;
  font-variation-settings: "SOFT" 45, "WONK" 1;
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: -0.012em;
  color: $ink;
  border-bottom: none;

  &:hover { color: $oxblood; }
}

.stack-ext {
  color: $oxblood;
  font-size: 0.78em;
  margin-left: 0.34em;
  vertical-align: 0.08em;
}

.stack-desc {
  color: $muted;
  font-size: 0.95rem;
  margin-top: 0.12rem;
}

// ---------------------------------------------------------------------------
// About — Quarto's `trestles` template emits the right pieces but nests the
// title inside the left column under the portrait. `display: contents` on
// .about-entity promotes its children into the outer grid so each can be
// placed: portrait and links left, name heading the text column.
//
// Quarto's own rules here are `div.quarto-about-trestles .about-entity .x`,
// so these selectors match that depth rather than reaching for !important.
// The two exceptions are `display`, which Quarto itself marks !important.
// ---------------------------------------------------------------------------
div.quarto-about-trestles {
  display: grid !important;
  grid-template-columns: 158px minmax(0, 1fr);
  column-gap: 2.4rem;
  row-gap: 0;
  align-items: start;
  // Without this the grid stretches its rows to fill the container height,
  // opening a ~200px gap between the portrait and the links below it.
  align-content: start;
  padding-top: 1.5em !important;

  .about-entity { display: contents !important; }

  .about-entity .about-image {
    grid-column: 1;
    grid-row: 1;
    border-radius: 50%;
    object-fit: cover;
    margin: 0;
  }

  #title-block-header {
    grid-column: 2;
    grid-row: 1;
    margin: 0;
    padding: 0;
    border-bottom: none;

    h1.title { font-size: clamp(1.7rem, 4vw, 2.1rem); margin: 0; }
  }

  .about-entity .about-links {
    grid-column: 1;
    grid-row: 2;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    row-gap: 0.45em;
    width: auto;
    margin-top: 1.1rem;
    padding-bottom: 0;
  }

  .about-entity .about-link {
    border: none;
    border-radius: 0;
    padding: 0;
    text-align: left;
    color: $oxblood;
    font-size: 0.86em;
    letter-spacing: 0.03em;

    &::before { content: "\2192\00a0"; opacity: 0.5; }
    i.bi { display: none; }
  }

  .about-contents {
    grid-column: 2;
    grid-row: 2;
    padding: 0;
    border-left: none;
  }

  .about-contents main.content { max-width: none; padding: 0; margin: 0; }

  // One column on a phone; the portrait leads.
  @media (max-width: 34rem) {
    grid-template-columns: minmax(0, 1fr);

    .about-entity .about-image { grid-column: 1; grid-row: 1; }
    #title-block-header        { grid-column: 1; grid-row: 2; margin-top: 1.1rem; }
    .about-contents            { grid-column: 1; grid-row: 3; }
    .about-entity .about-links { grid-column: 1; grid-row: 4; }
  }
}

// The surname, set like the landing wordmark's tail.
.nm-tail {
  font-style: italic;
  font-weight: 400;
  color: $oxblood;
  font-variation-settings: "SOFT" 80, "WONK" 1;
}