/* machine.learning.bio
   One stylesheet. No framework, no build step.
   Warm paper, near-black ink, one muted accent. Type does the work. */

/* ---------------------------------------------------------------- fonts */

@font-face {
  font-family: "Instrument Serif";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/instrumentserif-400.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/inter-400.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/fonts/inter-600.woff2") format("woff2");
}

/* --------------------------------------------------------------- tokens */

:root {
  --paper: #faf8f4;
  --ink: #1a1815;
  --muted: #6b655c;
  --accent: #3d6b63;
  --rule: #ddd8ce;

  --serif: "Instrument Serif", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --measure: 68ch;
  --column: 44rem; /* 704px */

  --step-0: 1.125rem; /* 18px  body            */
  --step-1: 1.25rem; /*  20px small headings  */
  --step-2: 1.75rem; /*  28px h2              */
  --step-3: 2.2rem; /*   35px h1              */

  --space-xs: 0.5rem;
  --space-s: 1rem;
  --space-m: 2rem;
  --space-l: 4rem;
  --space-xl: 7rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14130f;
    --ink: #ede9e1;
    --muted: #9c958a;
    --accent: #8fbdaf;
    --rule: #33302a;
  }
}

/* --------------------------------------------------------------- base */

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

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

body {
  margin: 0;
  padding: 0 1.5rem;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.65;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
}

/* One centred column. Nothing wider, ever. */
header,
main,
footer {
  max-width: var(--column);
  margin-inline: auto;
}

main {
  padding-bottom: var(--space-xl);
}

p,
li,
dd,
blockquote {
  max-width: var(--measure);
}

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

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 0;
}

/* The single permitted motion on the site. */
@media (prefers-reduced-motion: no-preference) {
  a {
    transition: text-decoration-thickness 120ms ease;
  }
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1.5rem;
  top: 1rem;
  z-index: 10;
  padding: 0.5rem 0.75rem;
  background: var(--paper);
  border: 1px solid var(--rule);
}

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

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.005em;
  text-wrap: balance;
  margin: 0 0 var(--space-s);
}

h1 {
  font-size: var(--step-3);
}
h2 {
  font-size: var(--step-2);
}
h3 {
  font-size: var(--step-1);
  line-height: 1.3;
}

h2 {
  margin-top: var(--space-l);
}
h3 {
  margin-top: var(--space-m);
}

/* Quiet sans label above a block. */
.label {
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 var(--space-s);
}

/* --------------------------------------------------- masthead & footer */

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-xs) var(--space-m);
  padding: var(--space-m) 0 var(--space-s);
}

.wordmark {
  font-family: var(--serif);
  font-size: var(--step-1);
  color: var(--ink);
  text-decoration: none;
}
.wordmark:hover {
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

.masthead nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9375rem;
}

.masthead nav a {
  color: var(--muted);
  text-decoration: none;
}
.masthead nav a:hover,
.masthead nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

footer {
  border-top: 1px solid var(--rule);
  padding: var(--space-m) 0 var(--space-l);
  font-size: 0.9375rem;
  color: var(--muted);
}
footer p {
  margin: 0 0 var(--space-xs);
}
footer a {
  color: var(--muted);
}

/* ---------------------------------------------------------------- hero */

.hero {
  padding: var(--space-xl) 0 var(--space-l);
  border-bottom: 1px solid var(--rule);
}

.hero h1 {
  font-size: clamp(2rem, 1.2rem + 3.6vw, 2.9rem);
  line-height: 1.1;
  margin: 0 0 var(--space-m);
  max-width: 20ch;
}

.hero p {
  font-size: var(--step-1);
  color: var(--muted);
  margin: 0;
}

/* -------------------------------------------------------------- blocks */

section {
  padding-top: var(--space-l);
}

.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: var(--space-l) 0 0;
}

.lead {
  font-size: var(--step-1);
  line-height: 1.5;
}

.note {
  font-size: 0.9375rem;
  color: var(--muted);
}

/* Boxless "card": a hairline above, text below. Never a box. */
.entry {
  padding-top: var(--space-m);
  margin-top: var(--space-m);
  border-top: 1px solid var(--rule);
}
.entry:first-of-type {
  margin-top: var(--space-s);
}
.entry h3 {
  margin-top: 0;
}
.entry p {
  margin: 0 0 var(--space-xs);
}

/* Plain-language one-liner under a title. */
.gloss {
  color: var(--muted);
}

/* --------------------------------------------------------------- lists */

.plain {
  list-style: none;
  padding: 0;
  margin: 0;
}

.plain > li + li {
  margin-top: var(--space-m);
}

/* Publications, grouped by year. */
.pubs {
  list-style: none;
  padding: 0;
  margin: 0;
}

.pubs > li {
  padding: var(--space-m) 0;
  border-top: 1px solid var(--rule);
}

.pubs .title {
  display: block;
  font-family: var(--serif);
  font-size: var(--step-1);
  line-height: 1.3;
  margin-bottom: var(--space-xs);
}

.authors {
  margin: 0 0 var(--space-xs);
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.55;
}
.authors strong {
  color: var(--ink);
  font-weight: 600;
}

.venue {
  margin: 0 0 var(--space-xs);
  font-size: 0.9375rem;
}

/* Artifact links, separated by hairline pipes rather than pills. */
.links {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.875rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-s);
}
.links li + li {
  border-left: 1px solid var(--rule);
  padding-left: var(--space-s);
}

/* Affiliation / venue tag: letterspaced caps, no pill, no colour fill. */
.tag {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

/* ---------------------------------------------------- people & defs */

dl.people {
  margin: 0;
}
dl.people dt {
  font-family: var(--serif);
  font-size: var(--step-1);
  line-height: 1.3;
  margin-top: var(--space-m);
}
dl.people dd {
  margin: var(--space-xs) 0 0;
  color: var(--muted);
}
dl.people dd a {
  color: var(--accent);
}

/* News: date, then one line. */
dl.news {
  margin: 0;
}
dl.news dt {
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: var(--space-m);
  padding-top: var(--space-m);
  border-top: 1px solid var(--rule);
}
dl.news dd {
  margin: var(--space-xs) 0 0;
}

/* ------------------------------------------------------------- filters */

/* Rendered only when filter.js runs; the list works fine without it. */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-s);
  margin: var(--space-m) 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.9375rem;
}

.filters button {
  font: inherit;
  color: var(--muted);
  background: none;
  border: 0;
  border-bottom: 1px solid transparent;
  padding: 0 0 2px;
  cursor: pointer;
}
.filters button:hover {
  color: var(--ink);
}
.filters button[aria-pressed="true"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

[hidden] {
  display: none !important;
}

/* Two spacing utilities, so no rule ever needs to live in a style attribute. */
.mt {
  margin-top: var(--space-m);
}
.mt0 {
  margin-top: 0;
}

/* --------------------------------------------------------------- misc */

blockquote {
  margin: var(--space-m) 0;
  padding-left: var(--space-s);
  border-left: 1px solid var(--rule);
  color: var(--ink);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
}

address {
  font-style: normal;
  color: var(--muted);
}

abbr {
  text-decoration: none;
}

ul.bullets,
ol.numbers {
  padding-left: 1.2em;
}
ul.bullets li,
ol.numbers li {
  margin-bottom: var(--space-xs);
}

/* --------------------------------------------------------------- small */

@media (max-width: 32rem) {
  body {
    padding: 0 1.125rem;
  }
  :root {
    --space-xl: 4.5rem;
    --space-l: 3rem;
  }
  .masthead {
    display: block;
  }
  .masthead nav ul {
    margin-top: var(--space-xs);
  }
}

/* --------------------------------------------------------------- print */

@media print {
  :root {
    --paper: #fff;
    --ink: #000;
    --muted: #444;
    --accent: #000;
    --rule: #bbb;
  }
  .masthead nav,
  .filters,
  .skip {
    display: none;
  }
  a {
    text-decoration: none;
  }
}