/* ==========================================================================
   paper.css — the paper-and-ink theme for the document pages
   (/research, /education, /seminar). Loaded AFTER style.css; every rule is
   scoped to .page-doc so index.html keeps its scroll-snap design.
   Palette / type follow the "rollout" note — its dark variant only, so the
   page stays in the same register as the rest of the site: ink-on-slate,
   Kiwi Maru headings, Zen Kaku Gothic New body, IBM Plex Mono for labels
   and metadata.
   ========================================================================== */

html:has(.page-doc) {
  color-scheme: dark;
  --paper: #000;/*#111815;*/
  --panel: #18211D;
  --ink: #E8EEE9;
  --ink2: #9AA8A0;
  --rule: #2C3833;
  --imagine: #8CB7E3;
  --imagine-soft: rgba(140, 183, 227, .12);
  --pick: #E8B546;
  --pick-soft: rgba(232, 181, 70, .16);
  --shadow: 0 1px 0 rgba(0, 0, 0, .3);
}

/* --- page frame ----------------------------------------------------------- */

html:has(.page-doc) {
  scroll-snap-type: none;
  scroll-behavior: smooth;
  background: var(--paper);
}

body.page-doc {
  height: auto;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: "Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

/* --- top bar -------------------------------------------------------------- */

.page-doc .header {
  display: block;   /* style.css makes .header a flex row; the topbar owns the layout here */
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 0;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.page-doc .topbar {
  max-width: 940px;
  margin: 0 auto;
  padding: 0 clamp(18px, 5vw, 40px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
}

.page-doc .brand {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: lowercase;
  color: var(--ink);
  white-space: nowrap;
}

.page-doc .menu {
  position: static;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px 18px;
}

.page-doc .menu a {
  margin-left: 0;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink2);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}

.page-doc .menu a:hover {
  color: var(--ink);
  border-bottom-color: var(--rule);
}

.page-doc .menu a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-doc .menu a.lang-switch {
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 11px;
  color: var(--ink2);
}

.page-doc .menu a.lang-switch:hover {
  background: var(--imagine-soft);
  border-color: var(--imagine);
  color: var(--imagine);
}

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

.page-doc .content {
  max-width: 940px;
  margin: 0 auto;
  padding: clamp(36px, 6vw, 72px) clamp(18px, 5vw, 40px) 104px;
  display: flex;
  flex-direction: column;
  gap: clamp(44px, 6vw, 72px);
  scroll-snap-align: none;
}

.page-doc .content a {
  color: var(--imagine);
}

/* --- eyebrow (mono kicker + hairline) ------------------------------------- */

.page-doc .eyebrow {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink2);
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-doc .eyebrow::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}

/* --- page head ------------------------------------------------------------ */

.page-doc .page-head {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-doc .content h1 {
  font-family: "Kiwi Maru", "Hiragino Mincho ProN", serif;
  font-weight: 500;
  font-size: clamp(30px, 6vw, 48px);
  line-height: 1.3;
  letter-spacing: .01em;
  margin: 0;
  padding: 0;
  border: 0;
  text-wrap: balance;
}

.page-doc .affil {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-doc .affil li {
  position: relative;
  margin: 0;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink2);
}

.page-doc .affil li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .85em;
  width: 8px;
  height: 1px;
  background: var(--rule);
}

.page-doc .lead {
  margin: 0;
  font-size: clamp(16px, 2.2vw, 18px);
  line-height: 1.85;
  color: var(--ink2);
}

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

.page-doc .content section.rsection {
  max-width: none;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  scroll-margin-top: 76px;
}

.page-doc .content h2 {
  font-family: "Kiwi Maru", "Hiragino Mincho ProN", serif;
  font-weight: 500;
  font-size: clamp(21px, 3.4vw, 28px);
  line-height: 1.5;
  margin: 0;
  text-align: left;
  color: var(--ink);
  -webkit-text-stroke: 0;
  text-wrap: balance;
}

.page-doc .content h2 .count {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .1em;
  color: var(--ink2);
  vertical-align: .35em;
  margin-left: 10px;
}

/* --- publication list ----------------------------------------------------- */

.page-doc .pub-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: pub;
  border-top: 1px solid var(--rule);
}

.page-doc li.research-item {
  counter-increment: pub;
  display: grid;
  grid-template-columns: 3.2em minmax(0, 1fr);
  column-gap: 4px;
  row-gap: 3px;
  margin: 0;
  padding: 16px 6px 16px 0;
  border-bottom: 1px solid var(--rule);
  line-height: 1.85;
  transition: background-color .15s ease;
}

.page-doc li.research-item::before {
  content: counter(pub, decimal-leading-zero);
  grid-column: 1;
  grid-row: 1;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px;
  line-height: 2.1;
  letter-spacing: .06em;
  color: var(--ink2);
  opacity: .75;
}

.page-doc li.research-item > * {
  grid-column: 2;
}

.page-doc li.research-item:hover {
  background: var(--panel);
}

.page-doc .item_desc {
  font-weight: 500;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-doc .item_citation {
  font-size: 16px;
  line-height: 1.4;
  color: var(--ink2);
}

.page-doc .item_citation p.contact-desc {
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink2);
}

.page-doc .item_doi,
.page-doc .item_doi a {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink2);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.page-doc .item_doi a {
  color: var(--ink2);
  border-bottom: 1px solid var(--rule);
}

.page-doc .item_doi a:hover {
  color: var(--imagine);
  border-bottom-color: var(--imagine);
}

/* --- badges --------------------------------------------------------------- */

.page-doc .item-desc-badge,
.page-doc .item-desc-badge-2,
.page-doc .item-desc-badge-review {
  display: inline-block;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  line-height: 1.7;
  padding: 0 8px;
  border-radius: 4px;
  vertical-align: .12em;
  margin-right: .5em;
}

.page-doc .item-desc-badge {
  color: var(--pick);
  background: var(--pick-soft);
  border: 1px solid transparent;
}

.page-doc .item-desc-badge-2 {
  color: #FE8BEB;
  background: rgba(254, 139, 235, .14);
  border: 1px solid transparent;
}

.page-doc .item-desc-badge-review {
  color: var(--ink2);
  background: transparent;
  border: 1px solid var(--rule);
}

/* --- link pills ----------------------------------------------------------- */

.page-doc .item_links {
  margin-top: .5em;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  max-width: 100%;
}

.page-doc .item-link-btn {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11.5px;
  letter-spacing: .06em;
  line-height: 1.9;
  padding: 1px 10px;
  border: 1px solid var(--btn-accent, var(--rule));
  border-radius: 999px;
  background: var(--panel);
  color: var(--btn-accent, var(--ink2)) !important;
  box-shadow: var(--shadow);
  transition: color .15s ease, border-color .15s ease, background-color .15s ease;
}

/* color variants: add alongside the base class, e.g.
   class="item-link-btn item-link-btn-pink" */
.page-doc .item-link-btn-purple { --btn-accent: #8b7ec8; }
.page-doc .item-link-btn-pink { --btn-accent: #FE8BEB; }
.page-doc .item-link-btn-coral { --btn-accent: #EE7674; }
.page-doc .item-link-btn-orange { --btn-accent: #e0895f; }
.page-doc .item-link-btn-gold { --btn-accent: #d4a835; }
.page-doc .item-link-btn-green { --btn-accent: #7fbf8f; }
.page-doc .item-link-btn-teal { --btn-accent: #5fb8b8; }
.page-doc .item-link-btn-blue { --btn-accent: #6fa8dc; }
.page-doc .item-link-btn-red { --btn-accent: #C2245B; }

/* plain pills stay neutral; color variants keep their color and gain a soft
   tint on hover */
.page-doc .item-link-btn:hover {
  border-color: var(--btn-accent, var(--imagine));
  background: color-mix(in srgb, var(--btn-accent, var(--imagine)) 12%, transparent);
  color: var(--btn-accent, var(--imagine)) !important;
}


/* --- prose blocks (education / seminar) ----------------------------------- */

.page-doc .content h3 {
  font-family: "Kiwi Maru", "Hiragino Mincho ProN", serif;
  font-weight: 500;
  font-size: clamp(17px, 2.4vw, 20px);
  line-height: 1.6;
  color: var(--ink);
  margin: 16px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--rule);
}

.page-doc .content h3:first-of-type {
  margin-top: 6px;
}

.page-doc .content p.contact-desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--ink);
}

.page-doc .semi-bold {
  font-weight: 700;
  color: var(--ink);
}

/* figures inside seminar items */

.page-doc .research-item img {
  display: block;
  border: 1px solid var(--rule);
  border-radius: 12px;
  box-shadow: var(--shadow);
  margin-top: 6px;
}

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

.page-doc .page-foot {
  border-top: 1px solid var(--rule);
  padding-top: 18px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink2);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.page-doc .page-foot a {
  color: var(--ink2);
}

.page-doc .page-foot a:hover {
  color: var(--imagine);
}

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

@media (max-width: 768px) {
  .page-doc .header {
    padding: 0;
  }
  .page-doc .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 10px clamp(16px, 5vw, 24px) 12px;
  }
  .page-doc .menu {
    position: static;
    top: auto;
    right: auto;
    justify-content: flex-start;
    gap: 4px 14px;
  }
  .page-doc .menu a {
    margin-left: 0;
    font-size: 11.5px;
  }
  .page-doc .content {
    padding: 28px 18px 72px;
  }
  .page-doc .content p,
  .page-doc .content li {
    line-height: 1.85;
  }
  .page-doc li.research-item {
    grid-template-columns: 2.4em minmax(0, 1fr);
    padding: 14px 2px;
  }
  .page-doc .item-link-btn {
    padding: 3px 12px;
    font-size: 12px;
  }
  .page-doc .item_links {
    gap: 8px;
    margin-top: .6em;
  }
}

/* --- project page (/world-models) ----------------------------------------- */
/* Also holds the research-page callout that links to it (.page-research). */

/* page head: subtitle under the h1, pull quote */

.page-project .content .project-sub {
  margin: -8px 0 0;
  font-family: "Kiwi Maru", "Hiragino Mincho ProN", serif;
  font-weight: 400;
  font-size: clamp(17px, 2.6vw, 21px);
  line-height: 1.5;
  color: var(--ink2);
}

.page-project .project-quote {
  margin: 4px 0 0;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--pick);
}

.page-project .content .project-quote p {
  margin: 0;
  font-family: "Kiwi Maru", "Hiragino Mincho ProN", serif;
  font-weight: 400;
  font-size: clamp(17px, 2.3vw, 19px);
  line-height: 1.7;
  color: var(--ink);
}

.page-project .project-quote cite {
  display: block;
  margin-top: 6px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px;
  font-style: normal;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--ink2);
}

/* V–M–C coverage table: each module cell is a tile whose border / fill
   encodes its state (is-full / is-partial / is-next / is-none) */

.page-project .vmc-wrap {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 4px;
}

.page-project .vmc-table {
  width: 100%;
  min-width: 720px;
  table-layout: fixed;
  border-collapse: separate;
  border-spacing: 5px;
  font-size: 13.5px;
  line-height: 1.6;
}

.page-project .vmc-col-num { width: 3.2em; }
.page-project .vmc-col-paper { width: 23%; }
.page-project .vmc-col-v { width: 20%; }
.page-project .vmc-col-m { width: 17%; }
.page-project .vmc-col-c { width: 15%; }

.page-project .vmc-table thead th {
  padding: 2px 10px 6px;
  border-bottom: 1px solid var(--rule);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  text-align: left;
  white-space: nowrap;
  color: var(--ink2);
}

.page-project .vmc-table td,
.page-project .vmc-table tbody th {
  padding: 10px;
  vertical-align: top;
  text-align: left;
  font-weight: 400;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 6px;
}

.page-project .vmc-table td.vmc-num {
  padding-left: 2px;
  padding-right: 2px;
  border-color: transparent;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink2);
}

.page-project .vmc-table tbody th.vmc-paper {
  padding-left: 2px;
  border-color: transparent;
  font-weight: 500;
}

.page-project .vmc-table .vmc-paper a {
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
  transition: color .15s ease, border-color .15s ease;
}

.page-project .vmc-table .vmc-paper a:hover {
  color: var(--imagine);
  border-bottom-color: var(--imagine);
}

.page-project .vmc-venue {
  display: block;
  margin-top: 3px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--ink2);
}

/* cell states (shared by the table and the legend swatches) */

.page-project .vmc-table td.is-full,
.page-project .vmc-swatch.is-full {
  background: var(--imagine-soft);
  border: 1px solid color-mix(in srgb, var(--imagine) 38%, var(--rule));
}

.page-project .vmc-table td.is-partial,
.page-project .vmc-swatch.is-partial {
  background: transparent;
  border: 1px dashed var(--imagine);
}

.page-project .vmc-table td.is-next,
.page-project .vmc-swatch.is-next {
  background: transparent;
  border: 1px dashed var(--pick);
  color: var(--pick);
}

.page-project .vmc-table td.is-none {
  text-align: center;
  color: color-mix(in srgb, var(--ink2) 60%, transparent);
}

.page-project .ebm-tag {
  display: inline-block;
  margin-left: 6px;
  padding: 0 5px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: .1em;
  line-height: 1.6;
  white-space: nowrap;
  vertical-align: .12em;
  color: var(--pick);
  background: var(--pick-soft);
  border-radius: 3px;
}

/* legend + note */

.page-project .vmc-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11.5px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--ink2);
}

.page-project .vmc-key {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-project .vmc-key .ebm-tag {
  margin-left: 0;
  vertical-align: baseline;
}

.page-project .vmc-swatch {
  display: inline-block;
  width: 20px;
  height: 12px;
  border-radius: 3px;
}

.page-project .content p.vmc-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink2);
}

/* research arc: phases, with the paper cards numbered 01–05 across them */

.page-project .pub-list {
  counter-reset: none;
}

.page-project #arc {
  counter-reset: pub;
}

.page-project #related .pub-list {
  counter-reset: pub;
}

.page-project .phase {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 18px;
}

.page-project .phase-num {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  line-height: 1.6;
  color: var(--imagine);
}

.page-project .content .phase h3 {
  margin: 0;
}

.page-project .phase .pub-list {
  margin-top: 4px;
}

/* phase 04: not implemented yet */
.page-project .phase.is-upcoming {
  padding: 16px 0 18px 18px;
  border-left: 2px dashed var(--pick);
  background: linear-gradient(90deg, color-mix(in srgb, var(--pick-soft) 60%, transparent), transparent 75%);
}

.page-project .phase.is-upcoming .phase-num {
  color: var(--pick);
}

.page-project .content .phase.is-upcoming h3 {
  padding-left: 0;
  border-left: 0;
}

/* cards reached from the table */
.page-project li.research-item[id] {
  scroll-margin-top: 80px;
}

.page-project li.research-item:target {
  background: var(--panel);
  box-shadow: inset 2px 0 0 var(--imagine);
}

/* research page: callout linking to /world-models */

.page-research .content a.project-callout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 18px;
  row-gap: 2px;
  margin-top: 6px;
  padding: 18px 20px;
  color: var(--ink2);
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: border-color .15s ease;
}

.page-research .content a.project-callout:hover {
  border-color: var(--imagine);
}

.page-research .project-callout .callout-eyebrow,
.page-research .project-callout .callout-title,
.page-research .project-callout .callout-text {
  display: block;
  grid-column: 1;
}

.page-research .project-callout .callout-eyebrow {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 11.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  line-height: 1.6;
  color: var(--ink2);
}

.page-research .project-callout .callout-title {
  font-family: "Kiwi Maru", "Hiragino Mincho ProN", serif;
  font-weight: 500;
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink);
}

.page-research .project-callout .callout-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink2);
}

.page-research .project-callout .callout-arrow {
  grid-column: 2;
  grid-row: 1 / span 3;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 20px;
  line-height: 1;
  color: var(--ink2);
  transition: color .15s ease, transform .15s ease;
}

.page-research .content a.project-callout:hover .callout-arrow {
  color: var(--imagine);
  transform: translateX(3px);
}

@media (max-width: 768px) {
  .page-project li.research-item[id] {
    scroll-margin-top: 110px;
  }
  .page-project .project-quote {
    padding-left: 14px;
  }
  .page-project .phase.is-upcoming {
    padding-left: 14px;
  }
  .page-research .content a.project-callout {
    column-gap: 12px;
    padding: 16px;
  }
}

/* --- inline media panel (research items) ---------------------------------- */
/* A pill <button class="item-link-btn item-media-toggle"> opens the
   .item-media panel below it; media.js injects the YouTube iframe on first
   open so nothing is loaded until the visitor asks for it. */

.page-doc button.item-link-btn {
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  margin: 0;
}

.page-doc .item-media-toggle::after {
  content: "▸";
  display: inline-block;
  margin-left: .45em;
  transition: transform .2s ease;
}

.page-doc .item-media-toggle[aria-expanded="true"]::after {
  transform: rotate(90deg);
}

.page-doc .item-media {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .3s ease;
}

.page-doc .item-media.is-open {
  grid-template-rows: 1fr;
}

.page-doc .item-media-inner {
  min-height: 0;
  overflow: hidden;
}

.page-doc .item-media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  max-width: 720px;
  margin-top: 10px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  background: #000;
}

.page-doc .item-media-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  .page-doc .item-media,
  .page-doc .item-media-toggle::after {
    transition: none;
  }
}