/* Brain2Face project page.
 * Hand-written CSS, no build step. Colours are tokens on :root, with a dark set for the system
 * theme and for the manual toggle. Media always sits on a dark "stage" because every avatar render
 * has a black background.
 * Shape rule: media, cards and panels use --radius; buttons, chips and segmented controls are pills.
 */

@font-face {
  font-family: "Geist";
  src: url("../fonts/geist-latin-wght.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("../fonts/geist-mono-latin-wght.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light;
  --font-sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --bg: #f3f4f5;
  --bg-raise: #fbfbfc;
  --bg-sunk: #e7e9ec;
  --ink: #121417;
  --ink-2: #454b54;
  --ink-3: #626973;
  --hair: rgba(18, 20, 23, 0.1);
  --hair-strong: rgba(18, 20, 23, 0.2);
  --accent: #0b746b;
  --accent-strong: #075b54;
  --accent-wash: rgba(11, 116, 107, 0.1);
  --on-accent: #f3fbfa;
  --shadow: 0 1px 2px rgba(18, 20, 23, 0.05), 0 10px 30px -12px rgba(18, 20, 23, 0.18);

  /* Media stage: identical in both themes. */
  --stage: #0b0c0e;
  --stage-raise: #16181b;
  --stage-ink: #eceef1;
  --stage-ink-2: #a1a8b2;
  --stage-hair: rgba(255, 255, 255, 0.1);
  --stage-accent: #4cc4b3;

  /* Chart series (dataviz default slots 1 and 2), plus de-emphasis gray. */
  --frozen: #2a78d6;
  --tuned: #eb6834;
  --scratch: #8b9099;
  --chart-grid: #e1e3e6;
  --chart-axis: #c4c8ce;

  --eeg-dim: rgba(18, 20, 23, 0.22);
  --eeg-bright: rgba(18, 20, 23, 0.82);
  --eeg-window: rgba(11, 116, 107, 0.14);
  --eeg-head: #0b746b;

  --radius: 14px;
  --radius-sm: 10px;
  --pill: 999px;
  --maxw: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  --nav-h: 60px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0d0e10;
    --bg-raise: #15171a;
    --bg-sunk: #1d2024;
    --ink: #eceef1;
    --ink-2: #b6bcc5;
    --ink-3: #8f96a0;
    --hair: rgba(255, 255, 255, 0.08);
    --hair-strong: rgba(255, 255, 255, 0.17);
    --accent: #4cc4b3;
    --accent-strong: #74d8c9;
    --accent-wash: rgba(76, 196, 179, 0.13);
    --on-accent: #04201c;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -14px rgba(0, 0, 0, 0.6);
    --frozen: #3987e5;
    --tuned: #d95926;
    --scratch: #8f949c;
    --chart-grid: #26292d;
    --chart-axis: #3a3e44;
    --eeg-dim: rgba(236, 238, 241, 0.22);
    --eeg-bright: rgba(236, 238, 241, 0.86);
    --eeg-window: rgba(76, 196, 179, 0.16);
    --eeg-head: #4cc4b3;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0d0e10;
  --bg-raise: #15171a;
  --bg-sunk: #1d2024;
  --ink: #eceef1;
  --ink-2: #b6bcc5;
  --ink-3: #8f96a0;
  --hair: rgba(255, 255, 255, 0.08);
  --hair-strong: rgba(255, 255, 255, 0.17);
  --accent: #4cc4b3;
  --accent-strong: #74d8c9;
  --accent-wash: rgba(76, 196, 179, 0.13);
  --on-accent: #04201c;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px -14px rgba(0, 0, 0, 0.6);
  --frozen: #3987e5;
  --tuned: #d95926;
  --scratch: #8f949c;
  --chart-grid: #26292d;
  --chart-axis: #3a3e44;
  --eeg-dim: rgba(236, 238, 241, 0.22);
  --eeg-bright: rgba(236, 238, 241, 0.86);
  --eeg-window: rgba(76, 196, 179, 0.16);
  --eeg-head: #4cc4b3;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  font-feature-settings: "ss01" on;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img,
video,
svg { display: block; max-width: 100%; }
[hidden] { display: none !important; }
img { height: auto; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }

h2 {
  font-size: clamp(1.7rem, 2.9vw, 2.45rem);
  line-height: 1.12;
  font-weight: 620;
  letter-spacing: -0.025em;
  text-wrap: balance;
}
h3 {
  font-size: 1.05rem;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -0.01em;
}
sub, sup { font-size: 0.72em; line-height: 0; }
i { font-style: italic; }

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

.i { width: 1.1em; height: 1.1em; flex: none; fill: currentColor; }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 30;
  padding: 8px 14px;
  border-radius: var(--pill);
  background: var(--ink);
  color: var(--bg);
}
.skip:focus { top: 12px; }

.section { padding-block: clamp(56px, 8vw, 104px); }
.section + .section { border-top: 1px solid var(--hair); }

.lead {
  margin-top: 16px;
  color: var(--ink-2);
  font-size: clamp(1rem, 1.25vw, 1.0875rem);
  line-height: 1.65;
}
.caption {
  margin-top: 14px;
  color: var(--ink-3);
  font-size: 0.875rem;
  line-height: 1.55;
  max-width: 90ch;
}

/* ------------------------------------------------------------------ buttons and controls */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 16px;
  border-radius: var(--pill);
  border: 1px solid var(--hair-strong);
  background: var(--bg-raise);
  color: var(--ink);
  font-weight: 560;
  font-size: 0.95rem;
  white-space: nowrap;
  text-decoration: none;
  transition: transform 0.15s var(--ease), background-color 0.2s, border-color 0.2s;
}
.btn:hover { text-decoration: none; border-color: var(--ink-3); }
.btn:active { transform: translateY(1px) scale(0.985); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn--primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn--ghost { background: transparent; }
.btn--sm { height: 34px; padding: 0 12px; font-size: 0.85rem; }
.btn--soon { color: var(--ink-3); border-style: dashed; background: transparent; cursor: default; }
.btn--soon:hover { border-color: var(--hair-strong); }
.btn--soon:active { transform: none; }
.soon {
  margin-left: 2px;
  padding: 1px 7px;
  border-radius: var(--pill);
  background: var(--bg-sunk);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--ink-3);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--pill);
  color: var(--ink-2);
  transition: background-color 0.2s, color 0.2s;
}
.icon-btn:hover { background: var(--bg-sunk); color: var(--ink); }

.seg {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  min-width: 0;
  max-width: 100%;
  border-radius: var(--pill);
  background: var(--bg-sunk);
  overflow-x: auto;
  scrollbar-width: none;
}
.seg::-webkit-scrollbar { display: none; }
.seg button {
  padding: 6px 13px;
  border-radius: var(--pill);
  font-size: 0.85rem;
  font-weight: 520;
  color: var(--ink-2);
  white-space: nowrap;
  transition: background-color 0.2s, color 0.2s, box-shadow 0.2s;
}
.seg button:hover { color: var(--ink); }
.seg button[aria-checked="true"] {
  background: var(--bg-raise);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12), 0 0 0 1px var(--hair);
}

.media-btn {
  position: absolute;
  right: 10px;
  bottom: 10px;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: var(--pill);
  color: #f2f4f6;
  background: rgba(10, 11, 13, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: transform 0.15s var(--ease), background-color 0.2s;
}
.media-btn:hover { background: rgba(10, 11, 13, 0.82); }
.media-btn:active { transform: scale(0.94); }
.media-btn .i--play { display: none; }
.is-paused > .media-btn .i--play,
.is-paused .media-btn .i--play { display: block; }
.is-paused > .media-btn .i--pause,
.is-paused .media-btn .i--pause { display: none; }

/* ------------------------------------------------------------------ navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s;
}
.nav.is-stuck { border-bottom-color: var(--hair); }
.nav__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: var(--nav-h);
}
.nav__brand {
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-size: 1.05rem;
}
.nav__brand:hover { text-decoration: none; }
.js .nav__brand {
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0s linear 0.3s;
}
.js .nav.is-stuck .nav__brand {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0s;
}
.nav__links { display: none; gap: 2px; margin-left: auto; }
.nav__links a {
  padding: 6px 11px;
  border-radius: var(--pill);
  color: var(--ink-2);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav__links a:hover { color: var(--ink); background: var(--bg-sunk); text-decoration: none; }
.nav__links a[aria-current="true"] { color: var(--ink); background: var(--bg-sunk); }
.nav__end { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav__links + .nav__end { margin-left: 0; }

[data-theme-toggle] .i--sun { display: none; }
:root[data-theme="dark"] [data-theme-toggle] .i--sun { display: block; }
:root[data-theme="dark"] [data-theme-toggle] .i--moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) [data-theme-toggle] .i--sun { display: block; }
  :root:not([data-theme="light"]) [data-theme-toggle] .i--moon { display: none; }
}

.nav__sheet {
  display: grid;
  gap: 2px;
  padding: 8px var(--gutter) 16px;
  border-bottom: 1px solid var(--hair);
  background: var(--bg);
}
.nav__sheet[hidden] { display: none; }
.nav__sheet a {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--ink);
  font-weight: 500;
}
.nav__sheet a:hover { background: var(--bg-sunk); text-decoration: none; }

@media (min-width: 900px) {
  .nav__links { display: flex; }
  .nav__menu-btn { display: none; }
  .nav__sheet { display: none !important; }
}

/* ------------------------------------------------------------------ hero */
.hero { padding-block: clamp(28px, 5vw, 60px) clamp(28px, 4vw, 48px); }
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4.5vw, 60px);
  align-items: center;
}
.hero__title {
  font-size: clamp(2.9rem, 5.4vw, 4.75rem);
  line-height: 0.98;
  font-weight: 660;
  letter-spacing: -0.045em;
}
.hero__subtitle {
  margin-top: 18px;
  max-width: 28ch;
  font-size: clamp(1.15rem, 1.7vw, 1.45rem);
  line-height: 1.35;
  font-weight: 450;
  color: var(--ink-2);
  text-wrap: balance;
}
.authors {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-top: 26px;
  font-size: 0.97rem;
  font-weight: 500;
}
.authors a { color: var(--ink); }
.authors a:hover { color: var(--accent); }
.authors sup { margin-left: 1px; color: var(--ink-3); }
.affils {
  display: grid;
  gap: 2px;
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--ink-3);
}
.affils sup { margin-right: 3px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.hero__soon { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.nowrap { white-space: nowrap; }

@media (min-width: 1000px) {
  .hero__grid { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
}

/* EEG-to-avatar stage */
.stage {
  position: relative;
  padding: clamp(14px, 1.8vw, 20px);
  border-radius: var(--radius);
  background: var(--stage);
  color: var(--stage-ink);
  box-shadow: var(--shadow);
  --eeg-dim: rgba(236, 238, 241, 0.2);
  --eeg-bright: rgba(236, 238, 241, 0.9);
  --eeg-window: rgba(76, 196, 179, 0.18);
  --eeg-head: #f2f4f6;
}
.stage__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.stage__label {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 0.8rem;
  color: var(--stage-ink-2);
}
.stage__label span {
  font-weight: 600;
  color: var(--stage-ink);
}
.stage__eeg { display: flex; flex-direction: column; min-width: 0; }
.stage__arrow { display: grid; place-items: center; color: var(--stage-ink-2); }
.stage__arrow .i { width: 22px; height: 22px; transform: rotate(90deg); }
.stage__avatar { min-width: 0; }
.stage__video {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: #000;
}
.stage__video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  -webkit-mask-image: linear-gradient(to bottom, #000 80%, transparent 99%);
  mask-image: linear-gradient(to bottom, #000 80%, transparent 99%);
  transition: opacity 0.35s ease;
}
.stage__video.is-looping video { opacity: 0; }
.stage__caption {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--stage-hair);
  font-size: 0.85rem;
  color: var(--stage-ink-2);
}
.stage__now { color: var(--stage-ink); }
.stage__now strong { font-weight: 600; margin-right: 4px; }
.stage__type {
  padding: 1px 9px;
  border-radius: var(--pill);
  background: rgba(76, 196, 179, 0.14);
  color: #9fe3d8;
  font-size: 0.78rem;
}
.stage__note { flex-basis: 100%; font-size: 0.8rem; color: var(--stage-ink-2); }

@media (min-width: 640px) {
  .stage__cols { grid-template-columns: minmax(0, 0.92fr) 22px minmax(0, 1.08fr); align-items: stretch; }
  .stage__arrow { padding-top: 26px; }
  .stage__arrow .i { transform: none; width: 20px; height: 20px; }
}

/* Fig. 1 of the paper as vector art. On phones it keeps a readable size and
   scrolls sideways, with the hidden side fading out. */
.fig1 { margin-top: clamp(44px, 6vw, 80px); }
.fig1__svg { width: 100%; height: auto; aspect-ratio: 672.791 / 202.524; }
@media (max-width: 699px) {
  .fig1__scroll {
    margin-inline: calc(-1 * var(--gutter));
    padding-inline: var(--gutter);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
  }
  .fig1__scroll::-webkit-scrollbar { display: none; }
  .fig1__svg { width: 760px; max-width: none; }
  .fig1__scroll.can-right { -webkit-mask-image: linear-gradient(to right, #000 calc(100% - 56px), transparent); mask-image: linear-gradient(to right, #000 calc(100% - 56px), transparent); }
  .fig1__scroll.can-left { -webkit-mask-image: linear-gradient(to right, transparent, #000 56px); mask-image: linear-gradient(to right, transparent, #000 56px); }
  .fig1__scroll.can-left.can-right {
    -webkit-mask-image: linear-gradient(to right, transparent, #000 56px, #000 calc(100% - 56px), transparent);
    mask-image: linear-gradient(to right, transparent, #000 56px, #000 calc(100% - 56px), transparent);
  }
}

/* EEG traces (drawn by main.js) */
.eeg {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  gap: 8px;
  min-height: 0;
}
.eeg--hero { flex: 1; min-height: 200px; }
.eeg__names {
  display: flex;
  flex-direction: column;
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1;
  color: var(--stage-ink-2);
  text-align: right;
}
.eeg__names li { flex: 1; display: flex; align-items: center; justify-content: flex-end; }
.eeg__plot { width: 100%; height: 100%; min-height: 0; overflow: visible; }
.eeg__plot .trace { fill: none; stroke-width: 1; vector-effect: non-scaling-stroke; stroke-linejoin: round; }
.eeg__plot .trace--dim { stroke: var(--eeg-dim); }
.eeg__plot .trace--bright { stroke: var(--eeg-bright); }
.eeg__plot .window { fill: var(--eeg-window); }
.eeg__plot .head { stroke: var(--eeg-head); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.eeg__axis {
  display: flex;
  white-space: nowrap;
  justify-content: space-between;
  gap: 8px;
  margin-top: 8px;
  padding-left: 34px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--stage-ink-2);
}
.eeg__key { color: #9fe3d8; text-align: center; }

.eeg--strip { height: 112px; }
.eeg--strip .eeg__names { color: var(--ink-3); font-size: 9px; }

/* ------------------------------------------------------------------ abstract */
.abstract {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  max-width: 76ch;
}
.abstract p { color: var(--ink-2); font-size: 1.02rem; line-height: 1.75; }
.abstract p:first-of-type { color: var(--ink); font-size: clamp(1.08rem, 1.4vw, 1.2rem); line-height: 1.6; }

/* ------------------------------------------------------------------ media */
.cinema,
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--stage);
}
.cinema { margin-top: 28px; aspect-ratio: 16 / 9; box-shadow: var(--shadow); }
.cinema video::cue { font-family: var(--font-sans); line-height: 1.35; color: #f3f4f5; background: rgba(8, 9, 10, 0.72); }
.cinema video,
.media video { width: 100%; height: 100%; object-fit: cover; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--triple { aspect-ratio: 3 / 1; }
.media--mosaic { aspect-ratio: 1938 / 822; }
.media video[data-src]:not([src]) { opacity: 0.001; }

/* ------------------------------------------------------------------ dataset bento */
.bento {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 36px;
}
.tile {
  min-width: 0;
  padding: 14px;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
}
.tile figcaption {
  margin-top: 12px;
  color: var(--ink-3);
  font-size: 0.85rem;
  line-height: 1.5;
}
.tile--multiview {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--stage);
  border-color: transparent;
  color: var(--stage-ink);
  --eeg-dim: rgba(236, 238, 241, 0.2);
  --eeg-bright: rgba(236, 238, 241, 0.88);
  --eeg-window: transparent;
  --eeg-head: #f2f4f6;
}
.tile--multiview .media { border-radius: var(--radius-sm); }
.tile--multiview .eeg { flex: 1; min-height: 112px; }
.tile--multiview .eeg__names { color: var(--stage-ink-2); }
.tile--multiview figcaption { margin-top: 0; color: var(--stage-ink-2); }
.tile--photo { display: flex; flex-direction: column; padding: 0; overflow: hidden; }
.tile--photo img { flex: 1 1 auto; width: 100%; min-height: 220px; aspect-ratio: auto; object-fit: cover; }
.tile--photo figcaption { margin: 0; padding: 12px 14px 14px; }

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  padding: 6px;
}
.stats dt { order: 2; font-size: 0.8rem; font-weight: 560; color: var(--ink-2); }
.stats dd {
  font-size: clamp(1.6rem, 2.4vw, 2rem);
  line-height: 1.05;
  font-weight: 620;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.stats div { display: flex; flex-direction: column; gap: 3px; }
.stats p { order: 3; font-size: 0.78rem; color: var(--ink-3); line-height: 1.35; }

.targets {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 4px;
}
.targets__head {
  padding-bottom: 4px;
  font-size: 0.72rem;
  font-weight: 560;
  color: var(--ink-3);
  text-align: center;
  white-space: nowrap;
}
.targets img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 6px;
  background: #000;
}

.tile--note {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 20px;
  background: var(--accent-wash);
  border-color: transparent;
}
.tile--note p { color: var(--ink-2); font-size: 0.93rem; line-height: 1.65; }

@media (min-width: 900px) {
  .bento { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .tile--multiview { grid-column: span 8; grid-row: span 2; }
  .tile--photo { grid-column: span 4; }
  .tile--stats { grid-column: span 4; }
  .tile--targets { grid-column: span 7; }
  .tile--note { grid-column: span 5; }
}

/* ------------------------------------------------------------------ protocol groups */
.groups {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 34px;
}
.group {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
}
.group__head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.group__id { font-size: 1.15rem; line-height: 1; color: var(--ink-2); }
.group__id i { font-style: italic; }
.group__id sub { font-size: 0.68em; margin-left: 1px; }
.group__count { font-size: 1.5rem; font-weight: 620; letter-spacing: -0.03em; }
.group__count small { margin-left: 4px; font-size: 0.8rem; font-weight: 500; color: var(--ink-3); letter-spacing: 0; }
.group h3 { font-size: 0.98rem; }
.roles { display: grid; gap: 6px; }
.roles div { display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 0.82rem; color: var(--ink-2); }
.role {
  padding: 2px 10px;
  border-radius: var(--pill);
  font-size: 0.75rem;
  font-weight: 560;
  white-space: nowrap;
}
.role--train { background: var(--bg-sunk); color: var(--ink-2); }
.role--seen { background: var(--accent-wash); color: var(--accent); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent); }
.role--unseen { background: var(--ink); color: var(--bg); }
.chips { display: flex; flex-wrap: wrap; gap: 5px; }
.chip {
  padding: 3px 9px;
  border-radius: var(--pill);
  border: 1px solid var(--hair);
  font-size: 0.76rem;
  line-height: 1.4;
  color: var(--ink-2);
  background: var(--bg);
}
.chips__more { color: var(--accent); font-size: 0.8rem; font-weight: 560; padding: 3px 4px; }

@media (min-width: 640px) {
  .groups { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1000px) {
  .groups { grid-template-columns: minmax(0, 1.55fr) repeat(3, minmax(0, 1fr)); }
}

/* ------------------------------------------------------------------ method */
.flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 36px;
}
.flow__node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
}
.flow__node p { font-size: 0.85rem; line-height: 1.5; color: var(--ink-2); }
.flow__arrow {
  position: absolute;
  left: 50%;
  bottom: -23px;
  color: var(--ink-3);
  transform: translateX(-50%) rotate(90deg);
}
.flow__arrow .i { width: 18px; height: 18px; }
.flow__visual { display: flex; flex-wrap: wrap; gap: 6px; min-height: 30px; align-items: center; }
.flow__visual--eeg { height: 46px; }
.flow__visual--eeg svg { width: 100%; height: 100%; }
.flow__visual--eeg path { fill: none; stroke: var(--ink-3); stroke-width: 1; vector-effect: non-scaling-stroke; }
.flow__visual--codes { display: inline-flex; align-items: center; gap: 3px; }
.flow__visual--codes span {
  display: block;
  width: 10px;
  height: 28px;
  border-radius: 3px;
  background: linear-gradient(to bottom, var(--accent), color-mix(in srgb, var(--accent) 25%, transparent));
}
.flow__visual--codes span:nth-child(2n) { opacity: 0.7; }
.flow__visual--codes span:nth-child(3n) { opacity: 0.5; }
.flow__node--out { background: var(--bg); }

/* Output stack: the output frames of the paper's Fig. 1, drawn from the figure above. */
.stack { width: 100%; max-width: 230px; margin: 0 auto; }
.stack__svg { width: 100%; height: auto; }
@media (prefers-reduced-motion: no-preference) {
  .js .stack__svg { opacity: 0; transform: translate(-12px, 8px); transition: opacity 0.6s var(--ease), transform 0.7s var(--ease); }
  .js .is-in .stack__svg { opacity: 1; transform: none; }
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 9px 2px 7px;
  border-radius: var(--pill);
  font-size: 0.74rem;
  font-weight: 560;
  white-space: nowrap;
}
.badge .i { width: 13px; height: 13px; }
.badge--frozen { color: var(--frozen); background: color-mix(in srgb, var(--frozen) 12%, transparent); }
.badge--tuned { color: var(--tuned); background: color-mix(in srgb, var(--tuned) 12%, transparent); }

.objective {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 18px;
}
.objective__eq {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
  color: var(--ink);
}
.objective__eq p { font-size: 0.88rem; color: var(--ink-2); line-height: 1.55; }
.objective__title { font-weight: 600; color: var(--ink) !important; font-size: 0.9rem !important; }
.objective__eq .eq {
  padding: 8px 0 4px;
  font-size: clamp(14px, 1.45vw, 18px);
  color: var(--ink);
  line-height: 1;
  white-space: nowrap;
  overflow-x: auto;
  overflow-y: hidden;
}
.objective__eq .eq--narrow { display: none; font-size: clamp(11.5px, 3.4vw, 15px); padding-bottom: 6px; }
.objective__eq .eq-weights { color: var(--ink-2); font-size: 0.95rem; }
.objective__eq .eq-weights .tex { color: var(--ink); }
@media (max-width: 899px) {
  .objective__eq .eq--wide { display: none; }
  .objective__eq .eq--narrow { display: block; }
}
.losses { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.losses div {
  display: grid;
  align-content: start;
  gap: 4px;
  padding: 14px;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
}
.losses dt { font-size: 1.05rem; line-height: 1.2; }
.losses dd { font-size: 0.84rem; color: var(--ink-2); line-height: 1.45; }

.method-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 22px;
}
.method-foot p { max-width: 70ch; color: var(--ink-2); font-size: 0.93rem; }

@media (min-width: 1040px) {
  .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr)) minmax(0, 1.7fr);
    gap: 24px;
  }
  .flow__arrow { left: auto; right: -21px; top: 50%; bottom: auto; transform: translateY(-50%); }
  .losses { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (max-width: 519px) {
  .losses { grid-template-columns: minmax(0, 1fr); }
}

/* ------------------------------------------------------------------ results viewer */
.viewer { margin-top: 32px; }
.viewer__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}
.viewer__screen {
  padding: clamp(10px, 1.4vw, 16px);
  border-radius: var(--radius);
  background: var(--stage);
  color: var(--stage-ink);
  box-shadow: var(--shadow);
  --eeg-dim: rgba(236, 238, 241, 0.2);
  --eeg-bright: rgba(236, 238, 241, 0.88);
  --eeg-window: rgba(76, 196, 179, 0.2);
  --eeg-head: #f2f4f6;
}
.viewer__labels {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 2px 4px 10px;
  font-size: 0.8rem;
  color: var(--stage-ink-2);
  text-align: center;
}
.viewer__labels .is-accent { color: #9fe3d8; font-weight: 560; }
.viewer__media {
  position: relative;
  aspect-ratio: 3 / 1;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: #000;
}
.viewer__media video { width: 100%; height: 100%; object-fit: cover; object-position: 100% 50%; transition: opacity 0.25s ease; }
.viewer__media.is-loading video { opacity: 0.35; }
.viewer__error {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 0.9rem;
  color: var(--stage-ink-2);
  background: rgba(0, 0, 0, 0.6);
}
.viewer__error[hidden] { display: none; }
.eeg--viewer { height: 104px; margin-top: 12px; }
.eeg--viewer .eeg__names { color: var(--stage-ink-2); }
.viewer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 16px;
  margin-top: 12px;
  padding: 10px 4px 2px;
  border-top: 1px solid var(--stage-hair);
}
.viewer__title { font-weight: 600; font-size: 1rem; }
.viewer__facts { font-size: 0.84rem; color: var(--stage-ink-2); }
.viewer__facts b { font-weight: 600; color: var(--stage-ink); font-variant-numeric: tabular-nums; }
.viewer__thumbs {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}
.thumb {
  display: grid;
  gap: 7px;
  padding: 6px;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
  text-align: left;
  transition: border-color 0.2s, transform 0.15s var(--ease);
}
.thumb:hover { border-color: var(--hair-strong); }
.thumb:active { transform: scale(0.985); }
.thumb[aria-checked="true"] { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.thumb img { width: 100%; aspect-ratio: 1; object-fit: cover; border-radius: 8px; background: #000; }
.thumb span { padding: 0 2px 2px; font-size: 0.78rem; line-height: 1.3; color: var(--ink-2); }
.thumb[aria-checked="true"] span { color: var(--ink); }

@media (max-width: 639px) {
  .viewer__media { aspect-ratio: 2 / 1; }
  .viewer__labels { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .viewer__label--camera { display: none; }
  .viewer__thumbs { grid-template-columns: repeat(5, 92px); overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 4px; }
  .thumb { scroll-snap-align: start; }
}

/* ------------------------------------------------------------------ analysis and charts */
.analysis { margin-top: 30px; }
.analysis__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.tabs { display: inline-flex; gap: 2px; padding: 3px; border-radius: var(--pill); background: var(--bg-sunk); min-width: 0; max-width: 100%; overflow-x: auto; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tabs button {
  padding: 8px 16px;
  border-radius: var(--pill);
  font-weight: 560;
  font-size: 0.92rem;
  color: var(--ink-2);
  white-space: nowrap;
  transition: background-color 0.2s, color 0.2s;
}
.tabs button:hover { color: var(--ink); }
.tabs button[aria-selected="true"] { background: var(--bg-raise); color: var(--ink); box-shadow: 0 1px 2px rgba(0, 0, 0, 0.12), 0 0 0 1px var(--hair); }

.panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}
.panel[hidden] { display: none; }
.panel__text { display: grid; grid-template-columns: minmax(0, 1fr); align-content: start; gap: 12px; }
.panel__text > p { color: var(--ink-2); font-size: 0.97rem; }
.panel__scope { color: var(--ink-3) !important; font-size: 0.85rem !important; }
.panel__video { margin-top: 6px; }

@media (min-width: 980px) {
  .panel { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); align-items: start; }
}

.chart-card {
  position: relative;
  padding: 18px 18px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
}
.chart-card--flat { margin-top: 12px; }
.chart { position: relative; min-height: 120px; }
.chart svg { width: 100%; height: auto; overflow: visible; }
.chart text { font-family: var(--font-sans); fill: var(--ink-3); font-size: 12px; }
.chart .t-strong { fill: var(--ink); font-weight: 600; }
.chart .t-label { fill: var(--ink-2); font-size: 12.5px; }
.chart .t-value { font-family: var(--font-mono); font-size: 11.5px; fill: var(--ink-2); }
.chart .t-value.t-strong { fill: var(--ink); font-weight: 650; }
.chart .t-facet { fill: var(--ink); font-size: 12.5px; font-weight: 600; }
.chart .grid { stroke: var(--chart-grid); stroke-width: 1; shape-rendering: crispEdges; }
.chart .axis { stroke: var(--chart-axis); stroke-width: 1; shape-rendering: crispEdges; }
.chart .link { stroke: var(--chart-axis); stroke-width: 2; stroke-linecap: round; }
.chart .series { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart .dot { stroke: var(--bg-raise); stroke-width: 2; }
.chart .hit { fill: transparent; cursor: default; }
.chart .bar { shape-rendering: geometricPrecision; }
.chart .zero { stroke: var(--ink-3); stroke-width: 1; shape-rendering: crispEdges; }
.chart .t-note { font-size: 11.5px; fill: var(--ink-3); }
.chart a.chart-link { cursor: pointer; }
.chart a.chart-link:hover text,
.chart a.chart-link:focus-visible text { fill: var(--accent); text-decoration: underline; }
.chart a.chart-link:focus-visible { outline: none; }
.section-note { margin-top: 26px; font-size: 0.85rem; color: var(--ink-3); }
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin-bottom: 10px;
  font-size: 0.82rem;
  color: var(--ink-2);
}
.chart-legend span { display: inline-flex; align-items: center; gap: 7px; }
.chart-legend i { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.chart-legend i.line { width: 16px; height: 2px; border-radius: 2px; }
.chart-tip {
  position: absolute;
  z-index: 5;
  pointer-events: none;
  padding: 7px 10px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--bg);
  font-size: 0.78rem;
  line-height: 1.35;
  white-space: nowrap;
  box-shadow: var(--shadow);
  transform: translate(-50%, calc(-100% - 10px));
}
.chart-tip b { font-family: var(--font-mono); font-weight: 600; }
.chart-tip[hidden] { display: none; }

.table-view { margin-top: 10px; border-top: 1px solid var(--hair); padding-top: 10px; }
.table-view summary {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 560;
  color: var(--ink-2);
  list-style: none;
}
.table-view summary::-webkit-details-marker { display: none; }
.table-view summary:hover { color: var(--ink); }
.table-scroll { overflow-x: auto; margin-top: 10px; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
.data-table th,
.data-table td { padding: 7px 10px; text-align: right; white-space: nowrap; }
.data-table th:first-child,
.data-table td:first-child { text-align: left; }
.data-table thead th { font-weight: 600; color: var(--ink-2); border-bottom: 1px solid var(--hair-strong); }
.data-table tbody td { font-family: var(--font-mono); font-variant-numeric: tabular-nums; color: var(--ink-2); }
.data-table tbody td:first-child { font-family: var(--font-sans); color: var(--ink); }
.data-table tbody tr + tr td { border-top: 1px solid var(--hair); }
.data-table .best { color: var(--ink); font-weight: 650; }
.data-table .group-row td { font-family: var(--font-sans); font-style: italic; color: var(--ink-3); border-top: 1px solid var(--hair-strong); padding-top: 12px; }
.table-note { margin-top: 8px; font-size: 0.78rem; color: var(--ink-3); }

/* ------------------------------------------------------------------ channel masking */
.masking {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 32px;
}
.masking__map { display: grid; grid-template-columns: minmax(0, 1fr); align-content: start; gap: 14px; }
.seg--masks { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-radius: var(--radius); gap: 4px; padding: 4px; }
.seg--masks button { display: grid; justify-items: center; gap: 4px; padding: 8px 4px; border-radius: var(--radius-sm); font-size: 0.8rem; white-space: normal; text-align: center; line-height: 1.2; }
.seg--masks svg { width: 34px; height: 34px; }
.seg--masks small { font-size: 0.72rem; color: var(--ink-3); font-weight: 500; }
.scalp-card {
  display: grid;
  justify-items: center;
  gap: 12px;
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
}
.scalp { width: min(100%, 340px); }
.scalp svg { width: 100%; height: auto; overflow: visible; }
.scalp text { font-family: var(--font-mono); font-size: 7.5px; fill: var(--ink-3); }
.scalp .zeroed-label { fill: var(--ink); font-weight: 600; }
.scalp-card figcaption { text-align: center; font-size: 0.84rem; color: var(--ink-2); line-height: 1.5; max-width: 46ch; }
.scalp-card figcaption b { font-weight: 600; color: var(--ink); }
.head-outline { fill: var(--bg); stroke: var(--ink-3); stroke-width: 1.2; }
.electrode { fill: var(--bg-raise); stroke: var(--ink-3); stroke-width: 1; }
.electrode.is-zeroed { fill: var(--accent); stroke: var(--accent); }
.seg--masks .electrode { stroke-width: 0; fill: var(--ink-3); opacity: 0.45; }
.seg--masks .electrode.is-zeroed { fill: var(--accent); opacity: 1; }
.seg--masks .head-outline { fill: none; stroke-width: 6; }
.seg--bad button { padding: 5px 10px; font-size: 0.78rem; }
.masking__chart { display: grid; grid-template-columns: minmax(0, 1fr); align-content: start; gap: 12px; }
.masking__chart > p { color: var(--ink-2); font-size: 0.97rem; }
.masking__head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; }
.masking__video { margin-top: 30px; }
.masking__video figcaption { margin-top: 10px; color: var(--ink-3); font-size: 0.85rem; }

@media (min-width: 980px) {
  .masking { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
}

/* ------------------------------------------------------------------ limitations */
.fails {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 30px;
}
.fail figcaption { margin-top: 10px; font-size: 0.88rem; color: var(--ink-2); line-height: 1.55; }
.fail figcaption strong { color: var(--ink); font-weight: 600; }
.limits {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px 40px;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--hair);
}
.limits li { color: var(--ink-2); font-size: 0.95rem; line-height: 1.6; }
.limits strong { display: block; color: var(--ink); font-weight: 600; }
@media (min-width: 900px) {
  .fails { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .limits { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ------------------------------------------------------------------ citation */
.bibtex {
  position: relative;
  margin-top: 26px;
  max-width: 860px;
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
}
.bibtex pre {
  margin: 0;
  padding: 22px 22px 22px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--ink-2);
}
.bibtex__copy { position: absolute; top: 12px; right: 12px; background: var(--bg-raise); }
.bibtex__copy .i--check { display: none; }
.bibtex__copy.is-done .i--check { display: block; color: var(--accent); }
.bibtex__copy.is-done .i--copy { display: none; }

/* ------------------------------------------------------------------ footer */
.footer { border-top: 1px solid var(--hair); padding: 34px 0 48px; }
.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.footer__logos { display: flex; flex-wrap: wrap; align-items: center; gap: 22px 30px; }
.logo {
  display: block;
  background-color: var(--ink-2);
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: left center;
  mask-position: left center;
  -webkit-mask-size: contain;
  mask-size: contain;
  transition: background-color 0.2s;
}
.logo:hover { background-color: var(--ink); }
.logo--mpi { width: 190px; height: 42px; -webkit-mask-image: url("../images/logos/mpi-inf.svg"); mask-image: url("../images/logos/mpi-inf.svg"); }
.logo--sic { width: 150px; height: 30px; -webkit-mask-image: url("../images/logos/sic.png"); mask-image: url("../images/logos/sic.png"); }
.logo--dfki { width: 76px; height: 34px; -webkit-mask-image: url("../images/logos/dfki.png"); mask-image: url("../images/logos/dfki.png"); }
.footer__links { display: flex; gap: 18px; font-size: 0.88rem; }
.footer__links a { color: var(--ink-2); }
.footer__links a:hover { color: var(--ink); }

/* ------------------------------------------------------------------ lightbox */
.lightbox {
  width: min(96vw, 1500px);
  max-width: none;
  max-height: 94vh;
  padding: 16px;
  border: 0;
  border-radius: var(--radius);
  background: #fbfbfc;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
}
.lightbox::backdrop { background: rgba(8, 9, 10, 0.72); }
.lightbox img { width: 100%; height: auto; }
.lightbox__close { position: absolute; top: 8px; right: 8px; color: #333; background: rgba(255, 255, 255, 0.85); }
.lightbox__close:hover { background: #fff; color: #000; }

/* ------------------------------------------------------------------ motion */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  }
  .js [data-reveal].is-in { opacity: 1; transform: none; }
  .js .hero__text > * { animation: rise 0.9s var(--ease) both; }
  .js .hero__text > :nth-child(2) { animation-delay: 0.06s; }
  .js .hero__text > :nth-child(3) { animation-delay: 0.12s; }
  .js .hero__text > :nth-child(4) { animation-delay: 0.16s; }
  .js .hero__text > :nth-child(5) { animation-delay: 0.2s; }
  .js .hero__text > :nth-child(6) { animation-delay: 0.24s; }
  .js .stage { animation: rise 1s 0.1s var(--ease) both; }
}
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

@media print {
  .nav, .media-btn, .bibtex__copy, .lightbox { display: none !important; }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; }
}

/* Panel labels above the failure clips. */
.fail__labels {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 6px;
  font-size: 0.76rem;
  color: var(--ink-3);
  text-align: center;
}
.fail__labels span:last-child { color: var(--accent); font-weight: 560; }
.flow__visual--decoder { justify-content: space-between; }

@media (max-width: 639px) {
  .targets__word { display: none; }
}

/* In the dark theme the media stages need a faint edge to separate them from the page. */
:root[data-theme="dark"] :is(.stage, .viewer__screen, .tile--multiview, .cinema, .media) {
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.07);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) :is(.stage, .viewer__screen, .tile--multiview, .cinema, .media) {
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.07);
  }
}

/* ------------------------------------------------------------------ inline math (the paper's glyphs) */
.tex { display: inline-block; line-height: 0; white-space: nowrap; }
svg.tex__svg { display: inline-block; max-width: none; overflow: visible; }
h3 .tex { margin-left: 2px; color: var(--ink-2); }
.chart .tex-in-chart { color: var(--ink-3); }
.chart .tex-in-chart.is-label { color: var(--ink-2); }
.chart .tex-in-chart.is-strong { color: var(--ink); }
.data-table th .tex { margin-left: 3px; color: var(--ink-3); }

/* ------------------------------------------------------------------ split diagram */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 32px;
  padding: clamp(16px, 2.2vw, 26px);
  border-radius: var(--radius);
  border: 1px solid var(--hair);
  background: var(--bg-raise);
}
.split__grid {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 9fr) repeat(3, minmax(0, 5fr));
  gap: 6px;
  align-items: stretch;
}
.split__colhead { display: flex; align-items: baseline; gap: 6px; padding: 0 2px 2px; font-size: 1rem; color: var(--ink-2); }
.split__colhead small { font-size: 0.74rem; color: var(--ink-3); }
.split__rowhead { display: flex; align-items: center; padding-right: 6px; font-size: 0.8rem; font-weight: 560; color: var(--ink-2); white-space: nowrap; }
.split__cell {
  display: grid;
  align-content: space-between;
  gap: 8px;
  min-width: 0;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: box-shadow 0.25s var(--ease);
}
.split__cell--train { background: var(--bg-sunk); }
.split__cell--seen { background: var(--accent-wash); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 30%, transparent); }
.split__cell--unseen { background: color-mix(in srgb, var(--ink) 9%, transparent); }
.sq-grid { display: grid; grid-template-columns: repeat(var(--cols, 5), minmax(0, 1fr)); gap: 3px; }
.split__cell[data-g="b1"] .sq-grid { --cols: 9; }
.sq {
  aspect-ratio: 1;
  border-radius: 2px;
  transition: opacity 0.2s ease, transform 0.25s var(--ease), box-shadow 0.2s ease;
}
.split__cell--train .sq { background: color-mix(in srgb, var(--ink-3) 42%, transparent); }
.split__cell--seen .sq { background: var(--accent); }
.split__cell--unseen .sq { background: var(--ink); }
.split__role { font-size: 0.72rem; font-weight: 600; letter-spacing: 0.01em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.split__cell--train .split__role { color: var(--ink-2); }
.split__cell--seen .split__role { color: var(--accent); }
.split__cell--unseen .split__role { color: var(--ink); }
.split.is-focus .sq:not(.is-hit),
.split[data-hl] .sq:not(.is-role) { opacity: 0.22; }
.split .sq.is-hit { transform: scale(1.35); box-shadow: 0 0 0 2px var(--bg-raise), 0 0 0 3.5px var(--ink); }
.split__tip {
  position: absolute;
  z-index: 4;
  max-width: 260px;
  padding: 8px 11px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--bg);
  font-size: 0.78rem;
  line-height: 1.4;
  pointer-events: none;
  box-shadow: var(--shadow);
  transform: translate(-50%, calc(-100% - 10px));
}
.split__tip b { font-weight: 600; }
.split__tip[hidden] { display: none; }
.split__side { display: grid; align-content: start; gap: 14px; }
.split__hint { font-size: 0.88rem; line-height: 1.55; color: var(--ink-2); }
.split__legend { display: grid; gap: 6px; }
.split__key {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--hair);
  background: var(--bg);
  text-align: left;
  transition: border-color 0.2s, transform 0.15s var(--ease);
}
.split__key:hover,
.split__key:focus-visible,
.split__key[aria-pressed="true"] { border-color: var(--ink-3); }
.split__key:active { transform: scale(0.985); }
.split__key i { width: 14px; height: 14px; border-radius: 3px; }
.split__key[data-role="train"] i { background: color-mix(in srgb, var(--ink-3) 42%, transparent); }
.split__key[data-role="seen"] i { background: var(--accent); }
.split__key[data-role="unseen"] i { background: var(--ink); }
.split__key span { font-size: 0.85rem; font-weight: 560; color: var(--ink); }
.split__key small { font-family: var(--font-mono); font-size: 0.76rem; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.split__note { font-size: 0.78rem; color: var(--ink-3); }
.group.is-linked { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
@media (min-width: 760px) {
  .split__grid { grid-template-columns: auto minmax(0, 15fr) repeat(3, minmax(0, 5fr)); }
  .split__cell[data-g="b1"] .sq-grid { --cols: 15; }
}
@media (min-width: 1040px) {
  .split { grid-template-columns: minmax(0, 8fr) minmax(0, 3fr); align-items: start; }
}
@media (prefers-reduced-motion: no-preference) {
  .js .split .sq { opacity: 0; transform: scale(0.4); }
  .js .split.is-built .sq { animation: sq-in 0.5s var(--ease) both; animation-delay: calc(var(--k) * 9ms + var(--s) * 140ms); }
  .js .split.is-built.is-settled .sq { animation: none; opacity: 1; transform: none; }
  .js .split.is-built.is-settled.is-focus .sq:not(.is-hit),
  .js .split.is-built.is-settled[data-hl] .sq:not(.is-role) { opacity: 0.22; }
  .js .split.is-built.is-settled .sq.is-hit { transform: scale(1.35); }
}
@keyframes sq-in { from { opacity: 0; transform: scale(0.4); } to { opacity: 1; transform: none; } }

/* ------------------------------------------------------------------ axis range slider */
.range { display: grid; gap: 8px; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--hair); }
.range__head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.range__title { font-size: 0.85rem; font-weight: 560; color: var(--ink-2); }
.range__readout { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.range__slider { position: relative; height: 28px; }
.range__track { position: absolute; left: 0; right: 0; top: 50%; height: 4px; margin-top: -2px; border-radius: var(--pill); background: var(--bg-sunk); }
.range__fill { position: absolute; top: 0; bottom: 0; border-radius: var(--pill); background: var(--accent); }
.range__input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 28px;
  margin: 0;
  background: none;
  pointer-events: none;
  -webkit-appearance: none;
  appearance: none;
}
.range__input:focus { outline: none; }
.range__input::-webkit-slider-runnable-track { background: none; border: 0; height: 28px; }
.range__input::-moz-range-track { background: none; border: 0; height: 28px; }
.range__input::-webkit-slider-thumb {
  -webkit-appearance: none;
  pointer-events: auto;
  width: 18px;
  height: 18px;
  margin-top: 5px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg-raise);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  cursor: grab;
}
.range__input::-moz-range-thumb {
  pointer-events: auto;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg-raise);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  cursor: grab;
}
.range__input:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 3px var(--accent-wash), 0 0 0 5px var(--accent); }
.range__input:focus-visible::-moz-range-thumb { box-shadow: 0 0 0 3px var(--accent-wash), 0 0 0 5px var(--accent); }
.range__actions { display: flex; flex-wrap: wrap; gap: 8px; }
.range__actions .btn[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }
.split__role-short { display: none; }
@media (max-width: 759px) {
  .split__cell:not([data-g="b1"]) .split__role-long { display: none; }
  .split__cell:not([data-g="b1"]) .split__role-short { display: inline; }
}