/* ---------------------------------------------------------------------------
   Garnet Liam Peet-Paré — site styles
   Single stylesheet; no build step, no framework.
   --------------------------------------------------------------------------- */

:root {
  --bg:            #fbfaf8;
  --bg-raised:     #ffffff;
  --bg-sunken:     #f2efea;
  --text:          #16202c;
  --text-muted:    #5b6673;
  --text-faint:    #8a939e;
  --accent:        #1a3a5c;
  --accent-soft:   #2e5a86;
  --rule:          #e2ddd5;
  --rule-strong:   #cfc8bd;

  --ok:            #2e7d32;
  --ok-bg:         #e8f5e9;
  --warn:          #b26a00;
  --warn-bg:       #fff6e2;
  --bad:           #b3261e;
  --bad-bg:        #fbe9e7;
  --info:          #4a5a6a;
  --info-bg:       #eceff2;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  color-scheme: light;

  --measure: 41rem;
  --wide: 68rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg:          #14171b;
    --bg-raised:   #1c2026;
    --bg-sunken:   #23282f;
    --text:        #e8e6e3;
    --text-muted:  #a8b0ba;
    --text-faint:  #7c848e;
    --accent:      #8fb8de;
    --accent-soft: #a9cbeb;
    --rule:        #2d333b;
    --rule-strong: #3d444d;

    --ok:   #86d492;  --ok-bg:   #16261a;
    --warn: #e8b569;  --warn-bg: #2a2114;
    --bad:  #f0928a;  --bad-bg:  #2c1a18;
    --info: #a3adb8;  --info-bg: #232830;
  }
}

/* The same palette when the visitor has forced dark with the header toggle. */
:root[data-theme="dark"] {
    color-scheme: dark;
    --bg:          #14171b;
    --bg-raised:   #1c2026;
    --bg-sunken:   #23282f;
    --text:        #e8e6e3;
    --text-muted:  #a8b0ba;
    --text-faint:  #7c848e;
    --accent:      #8fb8de;
    --accent-soft: #a9cbeb;
    --rule:        #2d333b;
    --rule-strong: #3d444d;

    --ok:   #86d492;  --ok-bg:   #16261a;
    --warn: #e8b569;  --warn-bg: #2a2114;
    --bad:  #f0928a;  --bad-bg:  #2c1a18;
    --info: #a3adb8;  --info-bg: #232830;
}

/* Engravings are drawn for a white ground; invert them on a dark one. */
:root[data-theme="dark"] .aiw {
  mix-blend-mode: screen;
  filter: invert(1);
  opacity: 0.62;
}


*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent-soft); }

/* Co-author names. Unadorned at rest so a citation line reads as a citation
   rather than as a row of links; underlined on hover to show they are links. */
a.name { text-decoration: none; }
a.name:hover,
a.name:focus { text-decoration: underline; }

/* --- Layout ------------------------------------------------------------- */

.wrap { width: 100%; max-width: var(--wide); margin: 0 auto; padding: 0 1.5rem; }
.prose { max-width: var(--measure); }

section { padding: 3.5rem 0; border-top: 1px solid var(--rule); }
section:first-of-type { border-top: 0; }

/* The intro carries no heading, so it should read as a continuation of the
   hero rather than as a separate band with a hole where a title would be. */
section.intro { padding-top: 0.5rem; }

/* --- Header / nav -------------------------------------------------------- */

.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 3.75rem;
}
.brand {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--serif);
  font-size: 1.0625rem; font-weight: 600; letter-spacing: 0.01em;
  color: var(--text); text-decoration: none; white-space: nowrap;
}
.brand:hover { color: var(--accent); }
.brand-mark {
  height: 2.35rem; width: auto; flex: none;
  transition: transform .18s ease;
}
.brand:hover .brand-mark { transform: translateY(-2px) rotate(-3deg); }

.nav { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.nav a {
  color: var(--text-muted); text-decoration: none;
  font-size: 0.9375rem; padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}

.nav a:hover, .nav a[aria-current="page"] { color: var(--text); border-bottom-color: var(--accent); }

/* --- Hero ---------------------------------------------------------------- */

.hero { padding: 4.5rem 0 2rem; }
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.1rem, 5.2vw, 3.1rem);
  line-height: 1.12; letter-spacing: -0.015em;
  margin: 0 0 1rem;
}
.hero .standfirst {
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
  line-height: 1.5; color: var(--text-muted);
  max-width: 34rem; margin: 0 0 1.75rem;
}
.hero-grid {
  display: grid; grid-template-columns: 1fr; gap: 2.5rem; align-items: start;
}
@media (min-width: 56rem) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) 15rem; gap: 3.5rem; }
}
.portrait {
  width: 100%; max-width: 15rem; height: auto;
  border-radius: 4px;
  border: 1px solid var(--rule-strong);
  /* Shot on white, which would otherwise dissolve into the page ground. */
  background: #fff;
}
@media (min-width: 56rem) {
  /* Align the top of the portrait with the top of the opening paragraph, i.e.
     drop it past the h1. Measured at 71.5px below the grid top. */
  .portrait { margin-top: 4.47rem; }
}

/* --- Typography ---------------------------------------------------------- */

h2 {
  font-family: var(--serif);
  font-size: clamp(1.45rem, 3vw, 1.8rem); line-height: 1.22;
  letter-spacing: -0.01em; margin: 0 0 1.25rem;
}
h3 {
  font-size: 1.0625rem; font-weight: 650; letter-spacing: 0.005em;
  margin: 2rem 0 0.6rem;
}
p { margin: 0 0 1.1rem; }
.prose > p:last-child { margin-bottom: 0; }

.eyebrow {
  font-size: 0.75rem; font-weight: 650; letter-spacing: 0.11em;
  text-transform: uppercase; color: var(--text-faint);
  margin: 0 0 0.85rem;
}
.lede { font-size: 1.15rem; line-height: 1.55; color: var(--text-muted); }
.small { font-size: 0.9375rem; }
.muted { color: var(--text-muted); }

/* --- Theme toggle ---------------------------------------------------------- */

.header-right { display: flex; align-items: center; gap: 1.25rem; margin-left: auto; }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2rem; height: 2rem; padding: 0; flex: none;
  background: none; border: 1px solid transparent; border-radius: 50%;
  color: var(--text-muted); cursor: pointer;
  transition: color .15s ease, border-color .15s ease, background-color .15s ease;
}
.theme-toggle:hover { color: var(--text); border-color: var(--rule); background: var(--bg-sunken); }
.theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.theme-toggle svg { width: 1.0625rem; height: 1.0625rem; display: block; }

/* Show the icon for the theme you would switch TO. */
.theme-toggle .icon-sun { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* The brand (165px), nav (303px) and toggle (32px) plus padding and gaps need about
   584px to share a row. Below that, put the brand and the toggle on the first row and
   give the nav the second one to itself. */
@media (max-width: 38rem) {
  .site-header .wrap {
    flex-wrap: wrap; align-items: center;
    row-gap: 0.2rem; column-gap: 0.75rem;
    min-height: 0; padding-top: 0.5rem; padding-bottom: 0.5rem;
  }
  .header-right { display: contents; }
  .site-header .nav { order: 3; width: 100%; gap: 1.15rem; }
  .theme-toggle { order: 2; margin-left: auto; }
  .brand-mark { height: 1.9rem; }
  .brand { font-size: 1rem; }
}

/* --- Work cards ---------------------------------------------------------- */

.card-grid {
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
}
.card {
  display: flex; flex-direction: column;
  background: var(--bg-raised);
  border: 1px solid var(--rule); border-radius: 6px;
  overflow: hidden; text-decoration: none; color: inherit;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.card:hover {
  border-color: var(--rule-strong);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px -10px rgba(0,0,0,.28);
  color: inherit;
}
.card-thumb {
  display: block; width: 100%; aspect-ratio: 16 / 9;
  object-fit: cover; object-position: top left;
  background: var(--bg-sunken); border-bottom: 1px solid var(--rule);
}
.card-body { padding: 1.15rem 1.25rem 1.35rem; }
.card h3 { margin: 0 0 0.4rem; font-size: 1.0625rem; font-weight: 650; }
.card p { margin: 0; font-size: 0.9375rem; color: var(--text-muted); line-height: 1.55; }
.card .tag-row { margin-top: 0.9rem; }

.tag {
  display: inline-block; font-size: 0.6875rem; font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--text-muted); background: var(--bg-sunken);
  border: 1px solid var(--rule); border-radius: 100px;
  padding: 0.15rem 0.6rem; margin: 0 0.3rem 0.3rem 0;
}

/* --- Lists --------------------------------------------------------------- */

.stack { list-style: none; margin: 1.25rem 0 0; padding: 0; }
.stack > li {
  padding: 1.1rem 0; border-top: 1px solid var(--rule);
}
.stack > li:first-child { border-top: 0; padding-top: 0; }
.stack .title { font-weight: 620; }
.stack .meta { color: var(--text-muted); font-size: 0.9375rem; }

.bullets { padding-left: 1.15rem; margin: 0 0 1.1rem; }
.bullets li { margin-bottom: 0.45rem; }

/* --- Case study ---------------------------------------------------------- */

.case-header { padding: 3.25rem 0 1rem; }
.case-header h1 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 4.4vw, 2.6rem); line-height: 1.15;
  letter-spacing: -0.015em; margin: 0 0 0.85rem;
}

.factbox {
  display: grid; gap: 1.25rem 2rem;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  padding: 1.4rem 1.5rem;
  background: var(--bg-raised);
  border: 1px solid var(--rule); border-radius: 6px;
  margin: 2rem 0;
}
.factbox dt {
  font-size: 0.7rem; font-weight: 650; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--text-faint); margin-bottom: 0.3rem;
}
.factbox dd { margin: 0; font-size: 0.9375rem; line-height: 1.5; }

figure { margin: 2.25rem 0; }
figure img {
  display: block; width: 100%;
  border: 1px solid var(--rule); border-radius: 6px;
  background: var(--bg-raised);
}
figcaption {
  margin-top: 0.7rem; font-size: 0.875rem; line-height: 1.5;
  color: var(--text-muted);
}

.callout {
  border-left: 3px solid var(--rule-strong);
  padding: 0.15rem 0 0.15rem 1.15rem;
  margin: 1.75rem 0; color: var(--text-muted);
}
.callout strong { color: var(--text); }

/* --- Archived essays ----------------------------------------------------- */

.post { max-width: var(--measure); }
.post p { margin: 0 0 1.15rem; }
.post h2 {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2.6vw, 1.55rem); line-height: 1.25;
  margin: 2.75rem 0 1rem;
}
.post h3 { margin: 2rem 0 0.6rem; }
.post ul, .post ol { padding-left: 1.25rem; margin: 0 0 1.15rem; }
.post li { margin-bottom: 0.45rem; }
.post img {
  display: block; width: 100%; height: auto;
  margin: 1.75rem auto 0.5rem;
  border: 1px solid var(--rule); border-radius: 4px;
}
.post .caption, .post figcaption {
  display: block; text-align: center;
  font-size: 0.875rem; color: var(--text-muted);
  margin: 0 0 1.75rem;
}
.post blockquote {
  margin: 1.75rem 0; padding: 0.15rem 0 0.15rem 1.15rem;
  border-left: 3px solid var(--rule-strong); color: var(--text-muted);
}
.post hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }
.post a { overflow-wrap: anywhere; }
/* Display equations can be wider than the measure on small screens. */
.post mjx-container[display="true"],
.post .MathJax_Display { overflow-x: auto; overflow-y: hidden; max-width: 100%; }

/* --- Data tables --------------------------------------------------------- */

.table-scroll { overflow-x: auto; margin: 1.75rem 0; }
table.data {
  border-collapse: collapse; width: 100%;
  font-size: 0.875rem; line-height: 1.45;
}
table.data th, table.data td {
  text-align: left; vertical-align: top;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--rule);
}
table.data th {
  font-size: 0.6875rem; font-weight: 650; letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--text-faint);
  border-bottom: 1px solid var(--rule-strong); white-space: nowrap;
}
table.data td { color: var(--text-muted); }
table.data td:first-child { color: var(--text); font-weight: 550; white-space: nowrap; }

.pill {
  display: inline-block; white-space: nowrap;
  font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.04em;
  border-radius: 100px; padding: 0.12rem 0.55rem;
}
.pill-ok   { color: var(--ok);   background: var(--ok-bg); }
.pill-warn { color: var(--warn); background: var(--warn-bg); }
.pill-bad  { color: var(--bad);  background: var(--bad-bg); }
.pill-info { color: var(--info); background: var(--info-bg); }

/* --- Tenniel illustrations ----------------------------------------------- */

/* The engravings are black line art on a white ground. `multiply` drops that
   white into the page colour so they sit on the paper instead of in a box;
   in dark mode the image is inverted and screened for the same effect. */
/* Sizing is left to each usage so the header mark can size independently. */
.aiw {
  display: block;
  mix-blend-mode: multiply;
  opacity: 0.9;
}
/* Cap the height too: a tall engraving would otherwise set the header row's
   height and leave a hole under a short title block. */
.case-motif img.aiw {
  max-width: 100%; max-height: 13.5rem;
  width: auto; margin-left: auto;
}
/* Screenshots get a framed card; the engravings must not — the generic
   `figure img` border would draw a box around the blended-out white ground. */
figure img.aiw { border: 0; border-radius: 0; background: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .aiw {
    mix-blend-mode: screen;
    filter: invert(1);
    opacity: 0.62;
  }
}

/* Case-study header: title block with a motif alongside it. Unlabelled, so it
   reads as part of the page rather than as an exhibit. */
.case-head-grid { display: grid; gap: 1.25rem; grid-template-columns: 1fr; }
@media (min-width: 56rem) {
  .case-head-grid {
    grid-template-columns: minmax(0, 1fr) 11rem;
    gap: 3.5rem; align-items: center;
  }
}
.case-motif { max-width: 11rem; }
@media (max-width: 55.99rem) {
  /* On narrow screens it would only push the text down; keep it small and left. */
  .case-motif { max-width: 7.5rem; }
}

/* Ornament — beside the education block on wide screens, below it on narrow */
.ornament { text-align: center; }
.ornament img { width: min(100%, 20rem); margin: 0 auto; }

.edu-grid { display: grid; gap: 2rem; grid-template-columns: 1fr; }
@media (min-width: 56rem) {
  .edu-grid {
    grid-template-columns: minmax(0, 1fr) minmax(14rem, 20rem);
    gap: 3rem; align-items: center;
  }
  .edu-grid .ornament img { width: 100%; }
}

/* --- Education ----------------------------------------------------------- */

.edu { list-style: none; margin: 0; padding: 0; max-width: var(--measure); }
.edu > li {
  display: grid; gap: 0.15rem 1.5rem;
  grid-template-columns: 1fr;
  padding: 0.9rem 0; border-top: 1px solid var(--rule);
}
.edu > li:first-child { border-top: 0; padding-top: 0; }
@media (min-width: 40rem) {
  .edu > li { grid-template-columns: minmax(0, 1fr) 4rem; align-items: baseline; }
  .edu .edu-year { text-align: right; }
}
.edu .edu-degree { font-weight: 620; }
.edu .edu-year { color: var(--text-faint); font-size: 0.9375rem; font-variant-numeric: tabular-nums; }
.edu .edu-school { color: var(--text-muted); font-size: 0.9375rem; grid-column: 1; }

/* --- Pipeline diagram ---------------------------------------------------- */

.diagram { margin: 2.25rem 0; }
.diagram svg { display: block; width: 100%; height: auto; }

/* --- Buttons / links ----------------------------------------------------- */

.btn-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.5rem; }
.btn {
  display: inline-block; text-decoration: none;
  font-size: 0.9375rem; font-weight: 560;
  padding: 0.55rem 1.1rem; border-radius: 4px;
  border: 1px solid var(--accent); color: var(--accent);
  background: transparent; transition: background .15s ease, color .15s ease;
}
.btn:hover { background: var(--accent); color: var(--bg-raised); }
.btn-primary { background: var(--accent); color: var(--bg-raised); }
.btn-primary:hover { background: var(--accent-soft); border-color: var(--accent-soft); color: var(--bg-raised); }

.backlink {
  display: inline-block; font-size: 0.875rem;
  color: var(--text-muted); text-decoration: none; margin-bottom: 1.5rem;
}
.backlink:hover { color: var(--accent); }

/* Employer disclaimer. Closes the bio, at full body size rather than as fine
   print, with a rule above it so it reads as a separate statement. */
p.disclaimer {
  margin-top: 1.75rem; padding-top: 1.25rem;
  border-top: 1px solid var(--rule-strong);
  color: var(--text);
}

/* --- Footer -------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0 3.5rem;
  font-size: 0.9375rem; color: var(--text-muted);
}
.site-footer .wrap {
  display: flex; flex-wrap: wrap; gap: 1rem 2rem;
  align-items: baseline; justify-content: space-between;
}
.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--accent); }

/* --- Utility ------------------------------------------------------------- */

.skip {
  position: absolute; left: -9999px;
  background: var(--bg-raised); color: var(--text);
  padding: 0.6rem 1rem; border: 1px solid var(--rule); border-radius: 4px;
}
.skip:focus { left: 1rem; top: 0.6rem; z-index: 50; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}