/* Cole Harrison.
   Look and feel after Physical Intelligence: bone paper, black ink, system mono
   for everything, serif reserved for the wordmark and page headings. No accent
   colour — links are grey and underlined. */

:root {
  --paper:   #f5f4ef;
  --ink:     #000000;
  --muted:   #686868;
  --link:    #595959;
  --border:  #403e37;
  --divider: #e5e4dc;
  --fill:    #ebeae5;
  color-scheme: light;
}

/* PI ships light only, and so does this: light is the default regardless of the
   visitor's system setting, and dark is reached only through the toggle. */
:root[data-theme="dark"] {
  --paper:   #14140f;
  --ink:     #f5f4ef;
  --muted:   #918f86;
  --link:    #a9a69b;
  --border:  #6d6a5e;
  --divider: #2c2b25;
  --fill:    #1d1c17;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  /* PI's exact stack — no webfont, nothing to load. */
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 0.8125rem;
  line-height: 1.62;
}

/* Signifier is Klim's and licensed, so the wordmark and headings use whatever
   good serif is already on the machine. */
.serif {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Charter,
    "Source Serif 4", Georgia, serif;
  font-weight: 400;
}

a {
  color: var(--link);
  text-underline-offset: 3px;
}
a:hover { color: var(--ink); }

/* Keyboard users had no visible position: everything was :hover-only. */
:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
  border-radius: 1px;
}

.skip { position: absolute; left: -9999px; }
.skip:focus {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 10;
  padding: 0.5rem 0.75rem;
  background: var(--paper);
  border: 1px solid var(--ink);
}

p { margin: 0; }

.shell {
  width: min(50rem, calc(100% - 3rem));
  margin-left: clamp(1.5rem, 4vw, 3rem);
  padding: 3rem 0 6rem;
}

/* ---------- header ---------- */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.75rem 2.5rem;
  margin-bottom: 2.75rem;
}

h1 {
  margin: 0;
  font-size: 1.75rem;
  line-height: 1.1;
  letter-spacing: -0.005em;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  margin-left: auto;
}
nav a, #theme {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 1px;
}
nav a:hover, #theme:hover { border-bottom-color: var(--muted); color: var(--muted); }

/* Icon button: the glyph shows the theme you would switch TO, and CSS chooses
   it from the root attribute so the right one paints before any script runs. */
#theme {
  display: inline-flex;
  align-items: center;
  padding: 0;
  background: none;
  border: 0;
  color: var(--ink);
  cursor: pointer;
  line-height: 0;
}
#theme svg { width: 1rem; height: 1rem; display: block; }
#theme:hover { color: var(--muted); background: none; }

#theme .i-sun { display: none; }
:root[data-theme="dark"] #theme .i-moon { display: none; }
:root[data-theme="dark"] #theme .i-sun { display: block; }

/* ---------- intro ---------- */

/* The plate. On PI the boxed entries pull the eye straight past the intro, so
   the intro gets the strongest box on the page rather than none at all. */
.plate {
  padding: 1.1rem 1.2rem;
  background: var(--paper);
  border: 1px solid var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
}

.intro {
  margin-bottom: 3.5rem;
  font-size: 0.875rem;
}
.intro p + p { margin-top: 0.85rem; }
.intro a { color: var(--ink); }

/* Plain text, not a mailto: — an address spelled out this way survives casual
   harvesting while staying obvious to a person. */
.profile-links .email { color: var(--muted); }

.profile-links {
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--divider);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  font-size: 0.8125rem;
}

/* ---------- portrait ---------- */

/* Two separate objects side by side rather than a photo boxed inside the card:
   the portrait gets its own plate treatment and the text plate stays text. */
.intro-row {
  display: grid;
  grid-template-columns: 9.5rem minmax(0, 1fr);
  gap: 1.25rem;
  align-items: start;
  margin-bottom: 3.5rem;
}
.intro-row .intro { margin-bottom: 0; }

.portrait { margin: 0; }
.portrait img {
  display: block;
  width: 100%;
  height: auto;
  /* Colour at rest — a hover-only reveal would leave phone and tablet visitors,
     who never hover, with nothing but the lesser version. */
  border: 1px solid var(--ink);
  box-shadow: 4px 4px 0 var(--signal);
}

/* Both cards answer together, from anywhere in the row, so the gesture doesn't
   depend on finding the photo. */
.intro-row .intro,
.intro-row .portrait img {
  transition: transform 220ms ease, box-shadow 220ms ease;
}
.intro-row:hover .intro,
.intro-row:hover .portrait img {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--signal);
}

@media (prefers-reduced-motion: reduce) {
  .intro-row .intro,
  .intro-row .portrait img { transition: none; }
  /* keep the shadow cue, drop the movement */
  .intro-row:hover .intro,
  .intro-row:hover .portrait img { transform: none; }
}

/* ---------- page headings ---------- */

h2 {
  margin: 0 0 1.25rem;
  font-size: 3rem;
  line-height: 1;
  letter-spacing: -0.015em;
}

section + section { margin-top: 4.5rem; }

/* ---------- the index ---------- */

.index {
  position: relative;
  margin: 0;
  padding: 0 0 0 2rem;
  list-style: none;
}

/* the spine */
.index::before {
  content: "";
  position: absolute;
  top: 0.6rem;
  bottom: 0.6rem;
  left: 3px;
  width: 1px;
  background: var(--border);
}

.item {
  position: relative;
  /* the same inline padding as a plate, so plated and unplated entries share one
     left edge for text and one right edge for media */
  padding: 0.85rem 1rem;
}

.item::before {
  content: "";
  position: absolute;
  top: 1.15rem;
  left: -2rem;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border-radius: 50%;
}

/* a flagged entry gets the plate — set "highlight": true in the JSON */
.item.plate {
  padding: 0.9rem 1rem;
  box-shadow: 3px 3px 0 var(--ink);
}
.item.plate::before { top: 1.4rem; }

/* Two plates in a row would otherwise stack their borders into a 2px seam, and
   the lower one's opaque background would paint over the upper one's offset
   shadow — merging them into a single tall box. A gap keeps each a distinct
   object with its own shadow. */
.item.plate + .item.plate { margin-top: 0.85rem; }

/* Grid, not flex: paper titles are long, and wrapping must not drop the date
   onto its own left-aligned line. */
.item-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0 1.5rem;
  align-items: baseline;
}

.item-title {
  grid-column: 1;
  grid-row: 1 / -1;
  font-weight: 700;
  line-height: 1.4;
}
.item-title a { color: inherit; text-decoration: none; }
.item-title a:hover { text-decoration: underline; }

.item-date {
  grid-column: 2;
  grid-row: 1;
  color: var(--muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

/* ---------- affiliation marks ---------- */

/* Under the date, so "when" and "where" read as one right-hand rail. */
.item-orgs {
  grid-column: 2;
  grid-row: 2;
  justify-self: end;
  margin: 0.1rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.3rem 0.4rem;
}

.org {
  padding: 0 0.35rem;
  border: 1px solid var(--divider);
  color: var(--muted);
  font-size: 0.6875rem;
  line-height: 1.5;
  white-space: nowrap;
}
.org a { color: inherit; text-decoration: none; }
.org:hover { border-color: var(--muted); }
.org a:hover { color: var(--ink); background: none; }

/* With a real mark the chip is just a frame — drop the border and let the logo
   sit on the page. */
.org.has-logo {
  padding: 0;
  border: 0;
  color: var(--muted);
}

/* Each mark is fitted to a common box at build time, so the row is the same
   height whatever it contains. Inline SVGs paint with currentColor directly;
   rasters are painted as a mask to the same effect — so one colour rule drives
   both. */
.org-logo {
  display: block;
  width: var(--logo-w);
  height: var(--logo-h);
  color: inherit;
}

span.org-logo {
  background: currentColor;
  -webkit-mask: var(--logo) no-repeat center / contain;
  mask: var(--logo) no-repeat center / contain;
}

/* every mark sits in the same band, centred, so marks of different heights
   still produce identical row spacing */
.org.has-logo a {
  display: flex;
  align-items: center;
  height: var(--org-band, 1.4rem);
  transition: color 140ms ease;
}

/* Hovering returns a mark to its own colour. Resting monochrome keeps the page
   quiet; the brand only appears on intent. */
.org.has-logo a:hover { color: var(--brand, var(--ink)); }
:root[data-theme="dark"] .org.has-logo a:hover {
  color: var(--brand-dk, var(--brand, var(--ink)));
}

@media (prefers-reduced-motion: reduce) {
  .org.has-logo a { transition: none; }
}

.item-authors,
.item-note {
  margin-top: 0.2rem;
  color: var(--muted);
  max-width: 36rem;
}

/* a shorter measure than the title and links, so the citation reads as a
   subordinate block instead of another full-width line */
.item-authors { max-width: 24rem; }

/* ---------- media ---------- */

/* Inline, not stacked: the figure takes a column beside the text so an entry
   stays one band tall instead of becoming a hero image. The text is wrapped so
   the figure occupies a single grid row — spanning rows would stretch them and
   open a gap between the title and the authors. */
.item.has-media {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16rem;
  column-gap: 1.5rem;
  align-items: start;
}

.item-media { margin: 0.75rem 0 0; }
.item.has-media .item-media { margin: 0; }
.item-media a { display: block; }

/* One ratio for every figure, so the column is flush whatever the source is.
   contain rather than cover: the videos are all ~16:9, but AnyMug's still is 2:1
   and cropping a multi-panel diagram would cut panels off. */
.item-media img,
.item-media video {
  display: block;
  width: 100%;
  height: auto;          /* required — else the HTML height attribute wins */
  aspect-ratio: 16 / 9;
  object-fit: contain;
  border: 1px solid var(--divider);
  background: var(--fill);
}
.item-media a:hover img,
.item-media a:hover video {
  border-color: var(--ink);
  box-shadow: 3px 3px 0 var(--signal);
}

.item-links {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1.25rem;
}

/* ---------- code ---------- */

.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.plain-list li {
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--divider);
}
.plain-list li:first-child { border-top: 1px solid var(--divider); }

/* ---------- news ---------- */

/* A bulleted log, not cards: one dated line per item, links inline in the
   sentence. Reads as a running feed and stays short as it grows. */
.news-list {
  margin: 0;
  padding: 0 0 0 1.1rem;
  list-style: disc;
}
.news-list li {
  margin-bottom: 0.55rem;
  padding: 0;
  border: 0;
  max-width: 40rem;
}
.news-list li::marker { color: var(--divider); }
.news-list li:last-child { margin-bottom: 0; }

.news-date {
  font-weight: 700;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

/* ---------- signal ----------
   One colour, borrowed from PI's own infographic highlight token and given a
   job they don't give it: the plate shadow, the beads, and a marker-pen link
   hover. It is the only hue on the page. */

:root { --signal: #fbd45b; }
:root[data-theme="dark"] { --signal: #f0c64a; }

.plate { box-shadow: 4px 4px 0 var(--signal); }
.item.plate { box-shadow: 3px 3px 0 var(--signal); }

.item::before {
  background: var(--signal);
  box-shadow: 0 0 0 1px var(--ink);
}

.index::before { background: var(--divider); }

a:hover {
  background: var(--signal);
  color: #151a19;
  text-decoration-color: transparent;
}
nav a:hover, #theme:hover {
  background: var(--signal);
  color: #151a19;
  border-bottom-color: var(--ink);
}

/* ---------- narrow ---------- */

@media (max-width: 46rem) {
  .item-head { grid-template-columns: minmax(0, 1fr); }
  .item-title, .item-date, .item-orgs { grid-column: 1; grid-row: auto; }
  .item-date { margin-top: 0.1rem; }
  .item-orgs { justify-self: start; justify-content: flex-start; }

  /* no room for a side column — the figure goes back under the text */
  .item.has-media { display: block; }
  .item.has-media .item-media { margin-top: 0.75rem; max-width: 22rem; }
}

@media (max-width: 40rem) {
  /* stack: portrait above the text, at a size that still reads as a portrait */
  .intro-row { grid-template-columns: minmax(0, 1fr); row-gap: 1.1rem; }
  .portrait { max-width: 8rem; }

  .shell {
    width: calc(100% - 2.5rem);
    margin-inline: auto;
    padding-top: 2.25rem;
  }
  h2 { font-size: 2.25rem; }
  nav { margin-left: 0; width: 100%; }
  .index { padding-left: 1.4rem; }
  .item::before { left: -1.4rem; }
  .item.plate { padding-inline: 0.75rem; }
}

@media print {
  .shell { width: auto; margin: 0; }
  nav, #theme { display: none; }
  .plate { box-shadow: none; }
}