/* ============================================================
   Working Paper — components
   Depends on styles/tokens.css
   ============================================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--body);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 560;
  letter-spacing: -0.02em;
  line-height: 1.12;
  text-wrap: balance;
}

p {
  margin: 0;
}

p + p {
  margin-top: 1em;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 1px;
}

/* ---------- links: orange, underline slides in ---------- */

a {
  color: var(--accent);
  text-decoration: none;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0 1px;
  transition: background-size var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

a:hover,
a:focus-visible {
  color: var(--accent-hover);
  background-size: 100% 1px;
}

a.quiet {
  color: inherit;
  background-image: linear-gradient(var(--ink), var(--ink));
}

a.quiet:hover,
a.quiet:focus-visible {
  color: var(--ink);
}

/* ---------- layout primitives ---------- */

.wrap {
  width: min(var(--container), 100% - 2 * var(--gutter));
  margin-inline: auto;
}

.grid {
  display: grid;
  gap: var(--gutter);
}

.grid--split {
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  align-items: start;
}

.grid--half {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--thirds {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.kicker {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--muted);
}

.abstract {
  font-family: var(--font-serif);
  font-size: 1.21rem;
  line-height: 1.58;
  color: var(--ink);
  max-width: 62ch;
}

.prose {
  max-width: 68ch;
}

.prose h3 {
  font-size: 1.2rem;
  margin: 1.8em 0 0.5em;
}

.mono {
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: 0.01em;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 0.1em 0.4em;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
}

/* ---------- masthead ---------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--hairline);
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 3.5rem;
}

.masthead__name {
  font-weight: 620;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  background-image: none;
  margin-right: auto;
  white-space: nowrap;
}

.masthead__status {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.masthead__status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}

.masthead nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.masthead nav a {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--body);
  background-image: linear-gradient(var(--accent), var(--accent));
}

.masthead nav a:hover,
.masthead nav a:focus-visible,
.masthead nav a[aria-current="page"] {
  color: var(--ink);
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.6rem;
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--text-small);
  font-weight: 600;
  cursor: pointer;
  background-image: none;
  transition:
    border-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease);
}

.btn:hover,
.btn:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  background-color: transparent;
}

.btn--accent {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--accent:hover,
.btn--accent:focus-visible {
  background-color: var(--accent);
  color: var(--paper);
}

.btn--mono {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
}

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

.section {
  border-top: 1px solid var(--hairline);
  padding-block: var(--section-pad);
}

.section__head {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.section__marker {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--muted);
  flex: none;
}

.section__head h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.35rem);
}

.section__lede {
  margin-top: 0.9rem;
  max-width: 58ch;
  color: var(--muted);
}

/* ---------- figure chrome: the one media wrapper ---------- */

.figure {
  margin: 0;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.75rem;
}

.figure__body {
  position: relative;
  border-radius: 2px;
  overflow: hidden;
  background: var(--hover-tint);
}

.figure__body > img,
.figure__body > video {
  width: 100%;
}

.figure figcaption {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.7rem 0.15rem 0.05rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  letter-spacing: 0.02em;
  color: var(--muted);
  line-height: 1.5;
}

.fig-no {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  flex: none;
}

.fig-src {
  margin-left: auto;
  flex: none;
  white-space: nowrap;
}

/* play overlay for videos whose autoplay was blocked */
.figure__play {
  position: absolute;
  inset: 0;
  display: none;
  place-items: center;
  background: rgba(15, 17, 21, 0.35);
  border: 0;
  cursor: pointer;
  color: #fff;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
}

.figure__play.is-visible {
  display: grid;
}

/* ---------- crossfade (CAD -> as built) ---------- */

.crossfade {
  position: relative;
  cursor: pointer;
}

.crossfade img {
  width: 100%;
}

.crossfade img + img {
  position: absolute;
  inset: 0;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 380ms var(--ease);
}

.crossfade.is-b img + img {
  opacity: 1;
}

/* ---------- chaptered player ---------- */

.player__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.player__tab {
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  transition:
    color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease);
}

.player__tab:hover {
  color: var(--ink);
  border-color: var(--hairline-strong);
}

.player__tab.is-active {
  color: var(--accent);
  border-color: var(--accent);
}

.player__tab--warn.is-active {
  color: var(--amber);
  border-color: var(--amber);
}

.player__note {
  min-height: 1.5em;
}

/* ---------- stats ---------- */

.stat {
  border-top: 1px solid var(--hairline);
  padding-top: 0.8rem;
}

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
  line-height: 1.05;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.stat__label {
  margin-top: 0.45rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  letter-spacing: 0.04em;
  color: var(--muted);
  line-height: 1.5;
  max-width: 26ch;
}

/* ---------- metadata block (ROLE / METHOD / ARTIFACTS) ---------- */

.meta-list {
  margin: 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.55rem 1.4rem;
  font-size: var(--text-small);
}

.meta-list dt {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 0.15em;
}

.meta-list dd {
  margin: 0;
  color: var(--body);
}

/* ---------- tag chips ---------- */

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.tags li {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 0.22rem 0.55rem;
  white-space: nowrap;
}

/* ---------- index table (arXiv listing) ---------- */

.index-table {
  width: 100%;
  border-collapse: collapse;
}

.index-table a.row-link {
  color: inherit;
  background-image: none;
}

.index-table tr {
  border-top: 1px solid var(--hairline);
  transition: background-color var(--dur-fast) var(--ease);
}

.index-table tr:last-child {
  border-bottom: 1px solid var(--hairline);
}

.index-table tbody tr:hover {
  background: var(--hover-tint);
}

.index-table td {
  padding: 1.1rem 1rem 1.1rem 0;
  vertical-align: baseline;
}

.index-table .idx {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  letter-spacing: var(--track-mono);
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
  width: 4.5rem;
}

.index-table .title {
  font-weight: 620;
  color: var(--ink);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.index-table .claim {
  color: var(--muted);
  font-size: var(--text-small);
}

.index-table .year {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  color: var(--muted);
  white-space: nowrap;
  text-align: right;
}

.index-table .arrow {
  width: 2rem;
  text-align: right;
  color: var(--muted);
  transition: color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.index-table tbody tr:hover .arrow {
  color: var(--accent);
}

/* ---------- experience ---------- */

.xp {
  border-top: 1px solid var(--hairline);
  padding: 1.6rem 0;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 3fr);
  gap: var(--gutter);
}

.xp:last-of-type {
  border-bottom: 1px solid var(--hairline);
}

.xp h3 {
  font-size: 1.15rem;
}

.xp__meta {
  margin-top: 0.4rem;
}

.xp ul {
  margin: 0;
  padding-left: 1.1rem;
}

.xp li + li {
  margin-top: 0.5rem;
}

.xp li::marker {
  color: var(--muted);
}

/* ---------- skills ---------- */

.skills {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gutter);
}

.skills h3 {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.7rem;
}

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

.hero {
  padding-block: clamp(3rem, 8vw, 5.5rem);
}

.hero h1 {
  font-size: clamp(2.3rem, 5.2vw, 4rem);
  max-width: 17ch;
}

.hero__intro {
  margin-top: 1.4rem;
  font-family: var(--font-serif);
  font-size: 1.18rem;
  line-height: 1.58;
  color: var(--body);
  max-width: 52ch;
}

.hero__links {
  margin-top: 1.9rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 1.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono);
}

.hero .kicker {
  margin-bottom: 1.3rem;
}

/* ---------- scroll cue ---------- */

.scroll-cue {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--muted);
}

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

.footer {
  border-top: 1px solid var(--hairline);
  padding-block: var(--section-pad) 2.5rem;
}

.footer__mailto {
  display: inline-block;
  font-weight: 620;
  font-size: clamp(1.6rem, 4.6vw, 3.2rem);
  letter-spacing: -0.025em;
  color: var(--ink);
  background-image: linear-gradient(var(--accent), var(--accent));
  background-size: 0 2px;
}

.footer__mailto:hover,
.footer__mailto:focus-visible {
  color: var(--ink);
  background-size: 100% 2px;
}

.footer__row {
  margin-top: 2.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  color: var(--muted);
}

.footer__row nav {
  display: flex;
  gap: 1.4rem;
}

.colophon {
  margin-top: 1.2rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  color: var(--muted);
}

/* ---------- click-to-load gate for heavy interactives ---------- */

.viewer-gate {
  position: relative;
  cursor: pointer;
  height: 100%;
}

.viewer-gate img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.viewer-gate::after {
  content: attr(data-label);
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  padding: 0.55rem 0.9rem;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: var(--radius);
  background: rgba(15, 17, 21, 0.55);
  color: #fff;
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  font-weight: 500;
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  white-space: nowrap;
}

.viewer-gate:hover::after {
  border-color: #fff;
}

/* ---------- demo control rows ---------- */

.demo-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.4rem;
  padding: 0.8rem 0.15rem 0.1rem;
  align-items: center;
}

.demo-controls label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.demo-controls input[type="range"] {
  accent-color: var(--accent);
  width: 110px;
}

/* ---------- artifact cards (PDFs, repos) ---------- */

.artifacts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gutter);
}

a.artifact {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.75rem;
  color: inherit;
  background-image: none;
  transition: border-color var(--dur-fast) var(--ease);
}

a.artifact:hover,
a.artifact:focus-visible {
  border-color: var(--accent);
  color: inherit;
}

.artifact img {
  width: 100%;
  border: 1px solid var(--hairline);
  border-radius: 2px;
}

.artifact__title {
  margin-top: 0.75rem;
  font-weight: 620;
  font-size: 0.98rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.artifact__meta {
  margin-top: 0.3rem;
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  letter-spacing: 0.04em;
  color: var(--muted);
}

.hero--case h1 {
  font-size: clamp(1.9rem, 4.2vw, 3.1rem);
  max-width: 22ch;
}

@media (max-width: 760px) {
  .artifacts {
    grid-template-columns: 1fr;
  }
}

/* ---------- breadcrumb (case pages) ---------- */

.crumb {
  font-family: var(--font-mono);
  font-size: var(--text-mono-s);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
}

/* ---------- reveal (section heads only) ---------- */

@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    opacity: 0;
    transform: translateY(4px);
    transition: opacity var(--dur-med) var(--ease), transform var(--dur-med) var(--ease);
  }

  .js .reveal.is-in {
    opacity: 1;
    transform: none;
  }
}

/* ---------- responsive ---------- */

@media (max-width: 1040px) {
  .grid--split,
  .grid--thirds {
    grid-template-columns: 1fr;
  }

  .skills {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .xp {
    grid-template-columns: 1fr;
    gap: 0.9rem;
  }

  .masthead__status {
    display: none;
  }
}

@media (max-width: 760px) {
  .grid--half {
    grid-template-columns: 1fr;
  }

  .skills {
    grid-template-columns: 1fr;
  }

  .masthead__inner {
    flex-wrap: wrap;
    padding-block: 0.6rem;
    row-gap: 0.35rem;
  }

  .masthead nav {
    width: 100%;
    flex-wrap: wrap;
    gap: 0.75rem 1rem;
  }

  .index-table .claim,
  .index-table .year {
    display: none;
  }

  .section__head {
    flex-direction: column;
    gap: 0.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}