/* ── IBM Plex Sans, self-hosted ──────────────────────────────
   One variable file per subset, downloaded from Google Fonts.
   The published site makes no external request for fonts. */

@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url(fonts/plex-latin.woff2) format('woff2');
  unicode-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+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'IBM Plex Sans';
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
  src: url(fonts/plex-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* ===========================================================
   Personal portfolio — one stylesheet, no framework.
   Monochrome, system fonts, no animation.
   =========================================================== */

:root {
  --ink: #111112;
  --paper: #fcfcfb;
  --muted: #767679;
  --line: #e2e2df;
  --stone: #f1f1ef;

  --measure: 64ch;
  --gutter: 1.5rem;
  --wide: 88rem;
}

@media (min-width: 48em) {
  :root { --gutter: 2.5rem; }
}

/* --- reset ------------------------------------------------ */

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

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

body,
h1, h2, h3, p, figure, blockquote, ul, ol, dl, dd { margin: 0; }

ul, ol { padding: 0; list-style: none; }

img, svg { display: block; max-width: 100%; }

/* An author `display` rule beats the browser's built-in [hidden] rule, so
   img { display: block } above would make hidden elements visible anyway.
   This puts hidden back in charge. */
[hidden] { display: none !important; }

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

a { color: inherit; text-decoration: none; }

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

body {
  font-family: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--ink); color: var(--paper); }

:focus-visible { outline: 1px solid var(--ink); outline-offset: 3px; }

.wrap {
  max-width: var(--wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: var(--gutter);
  top: 1rem;
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1rem;
}

/* --- type ------------------------------------------------- */

h1, h2, h3 { font-weight: 500; letter-spacing: -0.03em; line-height: 1.1; }

.display {
  font-size: clamp(2.5rem, 10vw, 8rem);
  line-height: 0.92;
  letter-spacing: -0.045em;
}

.heading { font-size: clamp(2.4rem, 5.2vw, 4rem); }

.meta {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.lede { color: var(--muted); max-width: 34rem; }

.link {
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
}
.link:hover { border-color: var(--ink); }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(252, 252, 251, 0.55);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* On the home page the header sits over the hero photo instead of above it,
   fully transparent, with light text so it stays readable on the image. */
.site-header--over {
  position: absolute;
  inset-inline: 0;
  background: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  color: #fff;
}
.site-header--over a { color: #fff; }
.site-header--over .site-nav .contact { color: rgba(255, 255, 255, 0.7); }
.site-header--over .nav-toggle { color: #fff; }

@media (max-width: 47.99em) {
  .site-header--over .site-nav { background: var(--paper); }
  .site-header--over .site-nav a { color: var(--ink); }
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.75rem;
}

.site-nav ul { display: flex; gap: 1.75rem; }
.site-nav a:hover { opacity: 0.6; }
.site-nav .contact { color: var(--muted); }

.nav-toggle { display: none; font-size: 0.875rem; }

@media (max-width: 47.99em) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: var(--paper);
    color: var(--ink);
    padding: 0 var(--gutter) 1rem;
  }
  .site-nav[data-open="true"] { display: block; }
  .site-nav ul { display: block; }
  .site-nav a { display: block; padding: 0.75rem 0; }
}

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

.hero {
  position: relative;
  min-height: 30rem;
  height: 100svh;
  background: var(--ink);
  color: #fff;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1200ms ease-in-out;
}
.hero img:first-of-type { opacity: 1; }

/* Most of these are phone photos in portrait, so a wide screen crops them
   hard. Centre is the default; the ones below need a different part of the
   frame kept. A higher percentage moves the photo down in the frame; a lower
   one moves it up. */
.hero img { object-position: center center; }
/* 65% moved from slot 2 to slot 1, following the photo that was swapped. */
.hero img:nth-of-type(1) { object-position: center 65%; }
/* The four of us in the lab: keep faces in frame. */
.hero img:nth-of-type(7) { object-position: center 35%; }
.hero img:nth-of-type(8) { object-position: center 30%; }

/* Flat wash so the name stays readable on any photo. */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.32);
}

.hero .wrap { position: relative; z-index: 1; width: 100%; }

/* A panel behind the name and intro so both stay legible over any photo,
   on top of the flat wash above. */
.hero-content {
  display: inline-block;
  max-width: 36rem;
  padding: clamp(1.25rem, 4vw, 2.25rem) clamp(1.5rem, 5vw, 2.5rem);
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 1rem;
}

.hero-foot { margin-top: 2rem; }
.hero-foot p { max-width: 30rem; font-size: 1.125rem; color: rgba(255, 255, 255, 0.85); }
.hero-foot strong { color: #fff; font-weight: 600; }
.hero-foot .meta { margin-top: 1.25rem; }
.hero-foot .meta { color: rgba(255, 255, 255, 0.55); }

.hero-current { margin-top: 0.75rem; display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: baseline; }
.hero-current .meta { margin-top: 0; }
.rotator { position: relative; color: rgba(255, 255, 255, 0.85); }
.rotator [data-rotator-item] { transition: opacity 300ms ease; }

.hero-dots {
  position: absolute;
  z-index: 1;
  right: var(--gutter);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.hero-dots button {
  width: 1px;
  height: 1.5rem;
  background: rgba(255, 255, 255, 0.35);
}
.hero-dots button[aria-current="true"] { background: #fff; }

@media (max-width: 47.99em) {
  .hero-dots { display: none; }
}

/* --- sections --------------------------------------------- */

.section { padding-block: 5rem; }

@media (min-width: 48em) {
  .section { padding-block: 8rem; }
}

.section-head-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2.5rem;
}

.section-head h2 { max-width: 32rem; }

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

.intro-grid {
  display: grid;
  gap: 3rem;
  margin-top: 3.5rem;
}

@media (min-width: 48em) {
  .intro-grid {
    grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.62fr);
    align-items: start;
    gap: 5rem;
    margin-top: 5rem;
  }
}

/* Portrait with the education block sitting under it. */
.intro-side { display: grid; gap: 2rem; }

.intro-text p { max-width: var(--measure); font-size: 1.0625rem; color: #3d3d40; }
.intro-text p + p { margin-top: 1.25rem; }
.intro-text strong, .looking strong { color: var(--ink); font-weight: 600; }
.intro-text .actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  margin-top: 2.75rem;
}
.intro-text p .link, .looking .link {
  color: var(--ink);
  font-weight: 500;
  border-bottom: 1px solid var(--ink);
}
.intro-text p .link:hover, .looking .link:hover { border-bottom-width: 2px; }

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.72rem 1.35rem;
  font-size: 0.9375rem;
  line-height: 1;
  color: var(--ink);
  border: 1px solid var(--line);
  transition: border-color 220ms ease, background-color 220ms ease, color 220ms ease;
}
.button:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

/* The arrow slides a touch on hover. Small enough to feel like a response
   rather than an animation. */
.button .arrow {
  font-size: 0.9em;
  transform: translateX(0);
  transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
}
.button:hover .arrow { transform: translateX(0.2em); }

/* Secondary: no box until you touch it. */
.button--quiet {
  padding-inline: 0;
  border-color: transparent;
  color: var(--muted);
}
.button--quiet:hover {
  background: none;
  border-color: transparent;
  color: var(--ink);
}

.stack { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; margin-top: 2rem; }
.stack li { font-size: 0.9375rem; color: var(--muted); }

.looking { margin-top: 2.5rem; }
.looking .meta { margin-bottom: 0.75rem; }
.looking p { max-width: var(--measure); font-size: 1.0625rem; color: var(--ink); }

.education .meta { margin-bottom: 0.9rem; color: var(--muted); }
.education .school { font-size: 1.0625rem; line-height: 1.35; color: var(--ink); }
.education .where { margin-top: 0.2rem; font-size: 0.9375rem; color: var(--muted); }
.education .awards {
  margin-top: 0.9rem;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--muted);
}

.portrait {
  aspect-ratio: 4 / 5;
  background: var(--stone);
}
.portrait img { width: 100%; height: 100%; object-fit: cover; }

/* On a narrow screen the side column dissolves into the grid so the photo can
   lead and the education block can fall below the text. */
@media (max-width: 47.99em) {
  .intro-side { display: contents; }
  .intro-grid .portrait { order: -1; }
}

/* --- projects (horizontal, native scroll) ----------------- */

.projects-count { display: flex; align-items: center; gap: 1.5rem; font-size: 0.9375rem; }
.projects-count .tally { color: var(--muted); font-variant-numeric: tabular-nums; }
.projects-arrows { display: flex; gap: 1rem; }
.projects-arrows button:hover { opacity: 0.6; }
.projects-arrows button[disabled] { opacity: 0.25; cursor: default; }

.projects-track {
  display: flex;
  gap: 0;
  margin-top: 2rem;
  padding-inline: var(--gutter);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}
.projects-track::-webkit-scrollbar { display: none; }

@media (min-width: 48em) {
  .projects-track { margin-top: 2.5rem; }
}

.project {
  position: relative;
  flex: 0 0 auto;
  width: 88vw;
  aspect-ratio: 4 / 3;
  background: var(--stone);
  scroll-snap-align: start;
  overflow: hidden;
}

@media (min-width: 40em) { .project { width: 64vw; } }
@media (min-width: 64em) { .project { width: 46vw; } }

.project-cover { position: absolute; inset: 0; }
/* Screenshots vary a lot in shape — anchor the crop to the top so the
   useful part of each one stays visible. */
.project img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }

.project-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.42);
}

/* Card buttons. They sit outside the card link so each one is its own
   anchor, stacked in the middle of the card and revealed on hover. */
.open-actions {
  position: absolute;
  z-index: 3;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}
.project:hover .open-actions,
.project:focus-within .open-actions { display: flex; }

.open {
  display: block;
  padding: 1rem 2rem;
  font-size: 1.125rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  white-space: nowrap;
  color: var(--ink);
  background: var(--paper);
  transition: background-color 200ms ease, color 200ms ease;
}
.open::after { content: "  \2192"; }
.open:hover { background: var(--ink); color: var(--paper); }

/* The card dims behind the buttons so they cannot be missed. */
.project:hover .project-cover::after,
.project:focus-within .project-cover::after { background: rgba(0, 0, 0, 0.72); }

/* Touch has no hover, so show them permanently, smaller, above the title. */
@media (hover: none) {
  .open-actions {
    display: flex;
    left: 2rem;
    top: auto;
    bottom: 5.5rem;
    transform: none;
    align-items: flex-start;
    gap: 0.5rem;
  }
  .open { padding: 0.55rem 1.1rem; font-size: 0.9375rem; }
  .project:hover .project-cover::after { background: rgba(0, 0, 0, 0.42); }
}

.project-label {
  position: absolute;
  z-index: 1;
  inset-inline: 0;
  bottom: 0;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem;
  color: #fff;
}
.project-label h3 { font-size: 1.5rem; }
.project-label .meta { color: rgba(255, 255, 255, 0.65); }

/* Ongoing marker. A small filled dot that slowly breathes, so a live project
   reads as live without shouting. Frozen under reduced motion by the global
   rule further down. */
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  white-space: nowrap;
}
.status .dot {
  width: 0.5em;
  height: 0.5em;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.project-label .meta.status { color: #fff; }
.post-header .status { margin-left: 0.85em; color: var(--ink); }

/* Lets the last card scroll to the left edge. */
.projects-track .spacer { flex: 0 0 var(--gutter); }

.filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.75rem;
  margin-top: 2.5rem;
}
.filters button {
  font-size: 1rem;
  color: var(--muted);
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
}
.filters button:hover { color: var(--ink); }
.filters button[aria-pressed="true"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* --- post cards ------------------------------------------- */

.card-grid {
  display: grid;
  gap: 3rem;
  margin-top: 3.5rem;
}

@media (min-width: 48em) {
  .card-grid { grid-template-columns: repeat(3, 1fr); gap: 2.5rem; margin-top: 5rem; }
}

.card-thumb { aspect-ratio: 4 / 3; background: var(--stone); }
.card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.card .meta { margin-top: 1.5rem; }
.card h3 { margin-top: 0.75rem; font-size: 1.25rem; line-height: 1.3; }
.card p { margin-top: 0.6rem; color: var(--muted); font-size: 1rem; }
.card a:hover h3 { opacity: 0.6; }

/* --- testimonials ----------------------------------------- */

.quote blockquote { max-width: var(--measure); font-size: 1.0625rem; color: #3d3d40; }
.quote figcaption { margin-top: 1.5rem; font-size: 0.9375rem; line-height: 1.45; }
.quote .who { display: block; }
.quote .role { display: block; color: var(--muted); }

/* --- life gallery ----------------------------------------- */

/* Photos keep their own shape. A column layout lets tall and wide shots sit
   next to each other without cropping either to a common ratio. */
.gallery {
  columns: 2;
  column-gap: 0.75rem;
  margin-top: 3rem;
}

@media (min-width: 48em) {
  .gallery { columns: 3; column-gap: 1rem; margin-top: 4rem; }
}

@media (min-width: 78em) {
  .gallery { columns: 4; }
}

.gallery li {
  break-inside: avoid;
  margin-bottom: 0.75rem;
}

@media (min-width: 48em) {
  .gallery li { margin-bottom: 1rem; }
}

.gallery figure { position: relative; background: var(--stone); }
.gallery img { display: block; width: 100%; height: auto; }

/* Same idea as the project cards: the image dims and the caption
   appears. No fade, it is simply there or not. */
.gallery figure::after {
  content: "";
  position: absolute;
  inset: 0;
}
.gallery li:hover figure::after { background: rgba(0, 0, 0, 0.72); }

.caption {
  display: none;
  position: absolute;
  z-index: 1;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 86%;
  text-align: center;
  font-size: 1.0625rem;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: #fff;
}
.gallery li:hover .caption { display: block; }

/* Touch has no hover, so the caption sits under the photo instead. */
@media (hover: none) {
  .gallery figure { background: none; }
  .gallery li:hover figure::after { background: none; }
  .caption {
    display: block;
    position: static;
    transform: none;
    width: auto;
    margin-top: 0.6rem;
    text-align: left;
    font-size: 0.9375rem;
    font-weight: 400;
    color: var(--muted);
  }
}

/* --- post page -------------------------------------------- */

.post { padding-block: 4rem 6rem; }
.post .wrap { max-width: var(--measure); }

.post-header { margin-top: 3rem; }
.post-header h1 { margin-top: 2rem; font-size: clamp(2.4rem, 5.2vw, 4rem); }
.post-header .lede { margin-top: 1.25rem; }
.post-links { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-top: 1.5rem; font-size: 0.9375rem; }

.post-cover { aspect-ratio: 4 / 3; background: var(--stone); margin-top: 3rem; }
.post-cover img { width: 100%; height: 100%; object-fit: cover; }

.post-body { margin-top: 3rem; font-size: 1.0625rem; color: #3d3d40; }
.post-body > * + * { margin-top: 1.4em; }
.post-body h2 { margin-top: 3em; font-size: 1.0625rem; color: var(--ink); }
.post-body strong { font-weight: 500; color: var(--ink); }
.post-body ul { list-style: disc; padding-left: 1.2em; }
.post-body ol { list-style: decimal; padding-left: 1.2em; }
.post-body li + li { margin-top: 0.45em; }
.post-body li::marker { color: var(--muted); }
.post-body blockquote { padding-left: 1.5em; border-left: 1px solid var(--line); color: var(--ink); }

/* Markdown extras: italics, rules, images, code blocks, tables. */
.post-body em { font-style: italic; }
.post-body hr { border: 0; border-top: 1px solid var(--line); margin-block: 3em; }
.post-body img { display: block; width: 100%; margin-block: 2em; }
.post-body video {
  display: block;
  width: 100%;
  margin-block: 2em;
  background: var(--ink);
}

.post-body code {
  font-size: 0.9em;
  background: var(--stone);
  padding: 0.12em 0.35em;
}
.post-body pre {
  overflow-x: auto;
  background: var(--stone);
  padding: 1.25rem 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.6;
}
.post-body pre code { background: none; padding: 0; font-size: inherit; }

/* Wide tables scroll inside their own box rather than the page. */
.post-body table {
  display: block;
  overflow-x: auto;
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}
.post-body th,
.post-body td {
  text-align: left;
  padding: 0.7rem 1.25rem 0.7rem 0;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.post-body th { font-weight: 500; color: var(--ink); }

/* KaTeX: keep a long display formula from widening the page. */
.post-body .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding-block: 0.5em;
}

.post-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-top: 2.5rem;
}

.post-nav {
  display: grid;
  gap: 2rem;
  margin-top: 5rem;
}
@media (min-width: 40em) {
  .post-nav { grid-template-columns: 1fr 1fr; }
  .post-nav .next { text-align: right; }
}
.post-nav span { display: block; }
.post-nav .title { margin-top: 0.75rem; }
.post-nav a:hover .title { opacity: 0.6; }

/* --- page header (blog index / posts) --------------------- */

.page-head { padding-block: 4rem 0; }
.page-head h1 { max-width: 32rem; }
.page-head .lede { margin-top: 1.25rem; }

/* --- timeline --------------------------------------------- */

.timeline { margin-top: 3.5rem; }

@media (min-width: 48em) {
  .timeline { margin-top: 5rem; }
}

.timeline li { display: grid; gap: 0.5rem; }
.timeline li + li { margin-top: 3rem; }

@media (min-width: 40em) {
  .timeline li {
    grid-template-columns: 8rem 1fr;
    gap: 2.5rem;
    align-items: baseline;
  }
  .timeline li + li { margin-top: 3.5rem; }
}

.timeline .when { padding-top: 0.35rem; }
.timeline h2 { font-size: 1.375rem; }
.timeline .where { color: var(--muted); font-size: 0.9375rem; }
.timeline p { max-width: var(--measure); color: #3d3d40; margin-top: 0.75rem; }
.timeline .points { max-width: var(--measure); margin-top: 1rem; color: #3d3d40; }
.timeline .points li { display: list-item; list-style: disc; margin-left: 1.1em; }
.timeline .points li + li { margin-top: 0.5rem; }

/* --- 404 -------------------------------------------------- */

.notfound { padding-block: 8rem 10rem; }
.notfound h1 { margin-top: 2rem; max-width: 24rem; }
.notfound .lede { margin-top: 1.5rem; }
.notfound-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  margin-top: 3rem;
  font-size: 0.9375rem;
}

/* --- footer ----------------------------------------------- */

.site-footer { padding-block: 2rem 3rem; }

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem 2.5rem;
}
.footer-top h2 { max-width: 28rem; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem 2rem;
  margin-top: 5rem;
  font-size: 0.9375rem;
  color: var(--muted);
}
.footer-bottom ul { display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; }
.footer-bottom a:hover { color: var(--ink); }