/* EEG/EMG Foundation Challenge 2026 — landing layout (Variation B: NeuroAI Docs).
   Sticky sidebar + main column on desktop, single-column flow on mobile. */

.preview-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 8px 16px;
  background: linear-gradient(90deg, rgba(34, 75, 141, 0.08), rgba(34, 75, 141, 0.04) 60%, rgba(34, 75, 141, 0.08));
  border-bottom: 1px solid rgba(34, 75, 141, 0.18);
  color: #1a3869;
  font-family: var(--bs-fontmono);
  font-size: 11px;
  letter-spacing: 0.6px;
  text-align: center;
  position: relative;
  z-index: 40;
}

.preview-banner .badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bs-link);
  color: white;
  font-weight: 700;
  letter-spacing: 1px;
  font-size: 9.5px;
  text-transform: uppercase;
}

.preview-banner strong {
  color: #6f3a23;
  font-weight: 600;
}

.placeholder-badge {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(34, 75, 141, 0.08);
  color: var(--bs-link);
  font-family: var(--bs-fontmono);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  vertical-align: middle;
  margin-left: 6px;
}

.placeholder-note {
  display: block;
  margin-top: 8px;
  font-family: var(--bs-fontmono);
  font-size: 11px;
  color: var(--bs-faint);
  letter-spacing: 0.4px;
}

@media (max-width: 600px) {
  .preview-banner {
    align-items: flex-start;
    justify-content: flex-start;
    font-size: 10.5px;
    padding: 8px 12px;
    line-height: 1.3;
    text-align: left;
  }

  .preview-banner .badge {
    flex: 0 0 auto;
  }

  .preview-banner span:not(.badge) {
    min-width: 0;
    flex: 1 1 180px;
  }

  .placeholder-badge {
    margin: 3px 0 0;
  }
}

.landing {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  background: var(--bs-bg);
  min-height: 100vh;
  min-width: 0;
}

/* Scrim is only used when the mobile sidebar is open. It must stay out of the
   grid flow at every breakpoint, otherwise it claims the second grid column on
   desktop and pushes main onto a new row. */
.sidebar-scrim {
  position: fixed;
  inset: 0;
  background: rgba(15, 19, 32, 0.36);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 20;
}

.sidebar-scrim.open {
  opacity: 1;
  pointer-events: auto;
}

/* ============================================================
   Sidebar
   ============================================================ */
.vb-sidebar {
  background: var(--bs-surface);
  border-right: 1px solid var(--bs-card-border);
  padding: 22px 18px;
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--bs-card-border) transparent;
}

.vb-sidebar::-webkit-scrollbar { width: 4px; }
.vb-sidebar::-webkit-scrollbar-thumb { background: var(--bs-card-border); border-radius: 999px; }

.vb-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 6px 18px;
  border-bottom: 1px solid var(--bs-card-border);
  text-decoration: none;
  color: var(--bs-text);
}

.vb-brand .glyph {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: var(--bs-code-bg);
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.vb-brand .title {
  font-weight: 700;
  font-size: 14px;
  line-height: 1.2;
}

.vb-brand .sub {
  font-family: var(--bs-fontmono);
  font-size: 10px;
  color: var(--bs-faint);
  letter-spacing: 0.4px;
}

.vb-nav {
  display: grid;
  gap: 22px;
  padding: 22px 0 0;
}

.vb-nav-section { display: grid; gap: 2px; }

.vb-nav-head {
  font-family: var(--bs-fontmono);
  font-size: 9px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--bs-faint);
  padding: 0 8px 6px;
}

.vb-nav a {
  display: block;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--bs-muted);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.15s ease;
}

.vb-nav a:hover {
  background: rgba(73, 78, 83, 0.06);
  color: var(--bs-text);
}

.vb-nav a.active {
  background: rgba(34, 75, 141, 0.1);
  color: var(--bs-link);
  font-weight: 600;
}

.vb-foot {
  margin-top: 26px;
  padding: 12px 8px;
  border-top: 1px solid var(--bs-card-border);
}

.vb-countdown {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 8px 0 10px;
  font-variant-numeric: tabular-nums;
}

.vb-cd-group {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
}

.vb-cd-num {
  font-family: var(--bs-fontmono);
  font-size: 22px;
  font-weight: 700;
  color: var(--bs-link);
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
}

.vb-cd-unit {
  font-family: var(--bs-fontmono);
  font-size: 10px;
  color: var(--bs-faint);
}

.vb-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--bs-muted);
  margin-top: 6px;
}

.vb-status .dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--bs-success);
  box-shadow: 0 0 0 3px rgba(42, 140, 78, 0.18);
  animation: bs-pulse 2s infinite;
  flex-shrink: 0;
}

/* ============================================================
   Main column
   ============================================================ */
.vb-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  width: 100%;
  min-width: 0;
}

.vb-main > * {
  min-width: 0;
}

.vb-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 32px;
  border-bottom: 1px solid var(--bs-card-border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 5;
}

.vb-bread {
  font-family: var(--bs-fontmono);
  font-size: 12px;
  color: var(--bs-muted);
  display: flex;
  gap: 8px;
  align-items: center;
  min-width: 0;
}

.vb-bread a {
  color: var(--bs-faint);
  text-decoration: none;
}

.vb-bread a:hover { color: var(--bs-link); }

.vb-bread strong {
  color: var(--bs-text);
  font-weight: 600;
}

.vb-bread .sep { color: var(--bs-line); }

.vb-top-cta {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
}

.vb-top-cta .kbd {
  display: inline-block;
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid var(--bs-card-border);
  background: white;
  font-size: 10px;
  line-height: 14px;
  text-align: center;
  margin-right: 4px;
  font-family: var(--bs-fontmono);
}

.vb-mobile-burger {
  display: none;
  background: transparent;
  border: 1px solid var(--bs-card-border);
  border-radius: 6px;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--bs-text);
  padding: 0;
}

/* ============================================================
   Hero
   ============================================================ */
.vb-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  padding: 56px 32px 72px;
  border-bottom: 1px solid var(--bs-card-border);
}

.vb-hero-text { max-width: 540px; }

.vb-hero-text h1 {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: 0;
  margin: 18px 0 18px;
  text-wrap: balance;
}

.vb-hero-text p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--bs-muted);
  margin: 0 0 26px;
  max-width: 50ch;
  text-wrap: pretty;
}

.vb-hero-text p strong { color: var(--bs-text); }

.bs-hero-cta {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.vb-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 24px;
}

.vb-tags .bs-pill {
  padding: 4px 10px;
  font-size: 11px;
}

.vb-hero-side {
  display: grid;
  gap: 16px;
  align-content: start;
  min-width: 0;
}

.vb-hero-eeg {
  background: var(--bs-surface);
  border: 1px solid var(--bs-card-border);
  border-radius: var(--bs-radius-card);
  padding: 14px 16px;
}

.bs-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

/* ============================================================
   Stats banner
   ============================================================ */
.vb-stats {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border-bottom: 1px solid var(--bs-card-border);
}

.vb-stat {
  padding: 26px 24px;
  border-right: 1px solid var(--bs-card-border);
  display: grid;
  gap: 4px;
  min-width: 0;
}

.vb-stat:last-child { border-right: none; }

.vb-stat strong {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0;
  font-family: var(--bs-fontmono);
}

.vb-stat .bs-kicker { font-size: 9px; }

.vb-stat-delta {
  font-family: var(--bs-fontmono);
  font-size: 10px;
  color: var(--bs-success);
  margin-top: 2px;
  letter-spacing: 0.4px;
}

/* ============================================================
   Section wrappers
   ============================================================ */
.vb-section {
  padding: 80px 32px;
  border-bottom: 1px solid var(--bs-card-border);
}

.vb-section-cream { background: var(--bs-surface-soft); }

.vb-section-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
  align-items: end;
}

.vb-section-head h2 {
  font-size: 36px;
  line-height: 1.06;
  letter-spacing: 0;
  margin: 14px 0 12px;
  font-weight: 700;
  text-wrap: balance;
}

.vb-section-head p {
  font-size: 15px;
  color: var(--bs-muted);
  margin: 0;
  max-width: 56ch;
}

.vb-section-head .bs-eyebrow { margin-bottom: 0; }

.vb-section-side {
  display: grid;
  gap: 12px;
  min-width: 0;
}

/* ============================================================
   Tracks
   ============================================================ */
.vb-tracks-meta { display: grid; gap: 14px; }

.vb-tracks-meta > div {
  display: grid;
  gap: 4px;
  padding: 10px 14px;
  border-left: 2px solid var(--bs-link);
  background: rgba(34, 75, 141, 0.04);
}

.vb-tracks-meta strong {
  font-size: 14px;
  font-weight: 600;
}

.vb-tracks {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  min-width: 0;
}

.vb-track {
  min-width: 0;
  padding: 26px;
  border-radius: var(--bs-radius-card);
  background: white;
  border: 1px solid var(--bs-card-border);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.vb-track.full-width {
  grid-column: 1 / -1;
}

@media (min-width: 901px) {
  .vb-track.full-width {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    grid-template-rows: auto auto 1fr auto auto;
    grid-template-areas:
      "head stats"
      "title stats"
      "desc lead"
      "tags lead"
      "cta cta";
    column-gap: 40px;
    row-gap: 12px;
  }
  .vb-track.full-width .track-head { grid-area: head; }
  .vb-track.full-width h3 { grid-area: title; margin-top: 0; }
  .vb-track.full-width p { grid-area: desc; }
  .vb-track.full-width .vb-track-paradigms { grid-area: tags; align-self: end; }
  .vb-track.full-width .track-stats { grid-area: stats; border-top: none; padding-top: 0; }
  .vb-track.full-width .vb-track-lead { grid-area: lead; align-self: start; margin-top: 0; }
  .vb-track.full-width .vb-track-cta { grid-area: cta; border-top: 1px solid var(--bs-card-border); padding-top: 16px; margin-top: 4px; }
}

.vb-track .track-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.vb-track h3 {
  font-size: 22px;
  margin: 4px 0 0;
  letter-spacing: 0;
  font-weight: 700;
  line-height: 1.15;
}

.vb-track p {
  font-size: 14px;
  color: var(--bs-muted);
  margin: 0;
  line-height: 1.55;
}

.vb-track-paradigms {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  padding-bottom: 4px;
}

.vb-track-paradigms .bs-pill {
  font-size: 10px;
  padding: 3px 8px;
}

.vb-track .track-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 16px;
  padding-top: 14px;
  border-top: 1px solid var(--bs-card-border);
}

.vb-track .track-stats > div { display: grid; gap: 2px; }

.vb-track .track-stats strong {
  font-size: 16px;
  font-family: var(--bs-fontmono);
  font-weight: 700;
}

.vb-track-lead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  min-width: 0;
  padding: 12px 14px;
  margin-top: 4px;
  background: var(--bs-code-bg);
  color: var(--bs-code-fg);
  border-radius: var(--bs-radius-md);
  font-family: var(--bs-fontmono);
}

.vb-track-lead > div {
  min-width: 0;
}

.vb-track-lead .bs-kicker {
  color: var(--bs-code-faint);
  display: block;
  margin-bottom: 2px;
}

.vb-track-lead .lead-name {
  display: block;
  font-size: 12px;
  color: var(--bs-code-fg);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.vb-track-lead .lead-score {
  font-size: 22px;
  font-weight: 700;
  color: var(--bs-accent);
  letter-spacing: 0;
  font-family: var(--bs-fontmono);
}

.vb-track-cta {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 4px;
  padding-top: 14px;
  border-top: 1px solid var(--bs-card-border);
  flex-wrap: wrap;
}

.track-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--bs-link);
  text-decoration: none;
}

.track-link:hover {
  color: var(--bs-link-hover);
  text-decoration: underline;
}

/* Featured track (Track 03) */
.vb-track.featured {
  background: linear-gradient(180deg, var(--bs-code-bg) 0%, var(--bs-code-bg-soft) 100%);
  color: var(--bs-code-fg);
  border-color: var(--bs-code-line);
}

.vb-track.featured h3 { color: white; }
.vb-track.featured p { color: #b9bcc8; }
.vb-track.featured .bs-kicker { color: var(--bs-code-faint); }
.vb-track.featured .track-head .bs-kicker { color: var(--bs-accent); }
.vb-track.featured .track-stats { border-top-color: rgba(255, 255, 255, 0.08); }
.vb-track.featured .track-stats strong { color: white; }

.vb-track.featured .vb-track-paradigms .bs-pill {
  background: rgba(255, 255, 255, 0.06);
  color: var(--bs-code-fg);
  border-color: rgba(255, 255, 255, 0.1);
}

.vb-track.featured .vb-track-paradigms .bs-pill:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.vb-track.featured .vb-track-lead { background: rgba(255, 255, 255, 0.04); }
.vb-track.featured .vb-track-lead .lead-score { color: var(--bs-accent); }

.vb-track.featured .bs-badge {
  background: rgba(77, 134, 247, 0.15);
  color: var(--bs-accent);
}

.vb-track.featured .vb-track-cta {
  border-top-color: rgba(255, 255, 255, 0.08);
}

.vb-track.featured .track-link { color: var(--bs-accent); }

/* ============================================================
   Timeline (phase strip)
   ============================================================ */
.vb-timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.phase-card {
  position: relative;
  padding: 22px 20px;
  border-radius: var(--bs-radius-card);
  background: white;
  border: 1px solid var(--bs-card-border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.phase-card .phase-rail {
  position: absolute;
  top: -6px;
  left: 20px;
  right: -34px;
  z-index: 1;
  height: 2px;
  background: var(--bs-card-border);
}

.phase-card:last-child .phase-rail {
  right: 20px;
}

.phase-card .phase-rail::after {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--bs-link);
  box-shadow: 0 0 0 3px rgba(34, 75, 141, 0.18);
}

.phase-card.done .phase-rail { background: var(--bs-link); }
.phase-card.done .phase-rail::after { background: var(--bs-link); }

.phase-card.active .phase-rail::after {
  background: var(--bs-accent);
  box-shadow: 0 0 0 3px rgba(77, 134, 247, 0.22);
  animation: bs-pulse calc(2.4s / var(--bs-anim-speed)) ease-in-out infinite;
}

.phase-card.upcoming .phase-rail::after {
  background: white;
  border: 2px solid var(--bs-card-border);
  width: 8px;
  height: 8px;
  box-shadow: none;
}

.phase-card .phase-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--bs-fontmono);
  font-size: 9px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--bs-faint);
}

.phase-card .phase-tag .badge {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 8.5px;
  letter-spacing: 0.8px;
  background: var(--bs-card-border);
  color: var(--bs-muted);
}

.phase-card.active .phase-tag .badge { background: rgba(77, 134, 247, 0.16); color: var(--bs-accent); }
.phase-card.done .phase-tag .badge { background: rgba(42, 140, 78, 0.14); color: var(--bs-success); }

.phase-card h3 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0;
  line-height: 1.2;
}

.phase-card .phase-date {
  font-family: var(--bs-fontmono);
  font-size: 12px;
  color: var(--bs-link);
  font-weight: 500;
}

.phase-card .phase-desc {
  font-size: 13px;
  color: var(--bs-muted);
  margin: 0;
  line-height: 1.5;
}

.phase-card .phase-meta {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--bs-card-border);
  display: grid;
  gap: 4px;
  font-family: var(--bs-fontmono);
  font-size: 11px;
  color: var(--bs-muted);
}

.phase-card .phase-meta .row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  min-width: 0;
}

/* ============================================================
   Leaderboard preview
   ============================================================ */
.vb-leader-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.vb-leader {
  background: white;
  border: 1px solid var(--bs-card-border);
  border-radius: var(--bs-radius-card);
  overflow: hidden;
  margin-bottom: 16px;
}

.vb-leader-row {
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr) 60px 60px 50px;
  gap: 14px;
  align-items: center;
  padding: 13px 18px;
  border-bottom: 1px solid var(--bs-card-border);
  font-size: 13px;
  transition: background 0.15s;
}

.vb-leader-row > span {
  min-width: 0;
}

.vb-leader-row:last-child { border-bottom: none; }
.vb-leader-row:hover:not(.head) { background: var(--bs-surface); }

.vb-leader-row.head {
  background: var(--bs-surface);
  font-family: var(--bs-fontmono);
  font-size: 9px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--bs-faint);
  padding: 10px 18px;
}

.vb-leader-row.hl {
  background: linear-gradient(90deg, rgba(34, 75, 141, 0.08), transparent);
}

.vb-leader-row.hl .nm { color: var(--bs-link); }

.vb-leader-row .rk {
  font-family: var(--bs-fontmono);
  color: var(--bs-faint);
  font-size: 12px;
}

.vb-leader-row .nm {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.vb-leader-row .tk {
  font-family: var(--bs-fontmono);
  font-size: 10px;
  color: var(--bs-link);
  background: rgba(34, 75, 141, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  width: fit-content;
  font-weight: 600;
}

.vb-leader-row .sc {
  font-family: var(--bs-fontmono);
  font-weight: 700;
  color: var(--bs-link);
}

.vb-leader-row .dl {
  font-family: var(--bs-fontmono);
  font-size: 11px;
  color: var(--bs-muted);
  text-align: right;
}

.ds-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

/* ============================================================
   Datasets table
   ============================================================ */
.ds-table {
  background: white;
  border: 1px solid var(--bs-card-border);
  border-radius: var(--bs-radius-card);
  overflow: hidden;
}

.ds-row {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr) 50px 50px 60px 50px 70px 120px;
  gap: 14px;
  align-items: center;
  padding: 12px 18px;
  border-bottom: 1px solid var(--bs-card-border);
  font-size: 13px;
  transition: background 0.15s;
}

.ds-row > span {
  min-width: 0;
}

.ds-row:last-child { border-bottom: none; }
.ds-row:hover:not(.head) { background: var(--bs-surface); }

.ds-row.head {
  background: var(--bs-surface);
  font-family: var(--bs-fontmono);
  font-size: 9px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--bs-faint);
  padding: 10px 18px;
}

.ds-row .id {
  font-family: var(--bs-fontmono);
  color: var(--bs-link);
  font-size: 12px;
  font-weight: 500;
}

.ds-row .nm {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ds-row .mod {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 10px;
  font-family: var(--bs-fontmono);
  font-weight: 700;
  letter-spacing: 0.4px;
  text-align: center;
  width: fit-content;
}

.ds-row .mod-eeg { background: rgba(34, 75, 141, 0.1); color: var(--bs-link); }
.ds-row .mod-meg { background: rgba(0, 54, 159, 0.12); color: var(--bs-accent-2); }
.ds-row .mod-ieeg { background: rgba(238, 95, 91, 0.12); color: #b33b3a; }

.ds-row .num {
  font-family: var(--bs-fontmono);
  color: var(--bs-muted);
  font-size: 12px;
}

.ds-row .bar {
  height: 5px;
  background: var(--bs-card-border);
  border-radius: 999px;
  overflow: hidden;
  display: block;
}

.ds-row .bar .fill {
  display: block;
  height: 100%;
  background: var(--bs-link);
  animation: bs-bar-grow 0.9s ease-out both;
  transform-origin: left;
}

/* ============================================================
   Models grid
   ============================================================ */
.vb-models {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.model-card {
  padding: 18px;
  border-radius: var(--bs-radius-card);
  background: white;
  border: 1px solid var(--bs-card-border);
}

.model-card .model-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
}

.model-card h4 {
  font-size: 18px;
  margin: 12px 0 4px;
  letter-spacing: 0;
  font-weight: 700;
}

.model-spec {
  font-size: 12px;
  color: var(--bs-muted);
  font-family: var(--bs-fontmono);
}

.model-stats {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--bs-card-border);
}

.model-stats > div { display: grid; gap: 2px; }

.model-stats strong {
  font-size: 18px;
  font-family: var(--bs-fontmono);
  font-weight: 700;
}

.model-bar {
  height: 4px;
  background: var(--bs-card-border);
  border-radius: 999px;
  margin-top: 12px;
  overflow: hidden;
}

.model-bar .fill {
  height: 100%;
  background: var(--bs-link);
  animation: bs-bar-grow 1s ease-out both;
  transform-origin: left;
}

.model-matrix {
  display: grid;
  gap: 1.5px;
  width: fit-content;
}

.model-matrix .cell {
  width: 4px;
  height: 4px;
  border-radius: 1px;
  background: var(--bs-link);
}

/* ============================================================
   Sponsors / organizing institutions strip
   ============================================================ */
.vb-sponsors {
  padding: 56px 32px;
  border-bottom: 1px solid var(--bs-card-border);
  background: white;
}

.vb-sponsors-grid {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.vb-sponsors-side h2,
.vb-sponsors-side h3 {
  font-size: 18px;
  margin: 8px 0 8px;
  letter-spacing: 0;
  font-weight: 700;
  line-height: 1.25;
}

.vb-sponsors-side p {
  font-size: 13px;
  color: var(--bs-muted);
  margin: 0 0 12px;
  line-height: 1.5;
}

.vb-logo-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 32px;
  margin-top: 12px;
}

.vb-logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  width: auto;
  min-width: 60px;
  transition: opacity 0.2s ease;
}

/* Bump wordmark-only or visually small logos so they read at parity with
   logos that have thicker glyphs or stacked two-line marks. */
.vb-logo-mark--lg {
  height: 56px;
}

.vb-logo-mark--xl {
  height: 64px;
}

.vb-logo-mark:hover {
  opacity: 0.8;
}

.vb-logo-mark img {
  max-height: 100%;
  max-width: 140px;
  width: auto;
  object-fit: contain;
}

.vb-logo-mark--lg img,
.vb-logo-mark--xl img {
  max-width: 180px;
}

/* Fallback for when logos are missing or just text is preferred */
.org-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.org-mark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--bs-card-border);
  border-radius: var(--bs-radius-md);
  background: var(--bs-surface);
  font-size: 12px;
  font-weight: 600;
  color: var(--bs-text);
  font-family: var(--bs-fontmono);
  letter-spacing: 0.4px;
  transition: all 0.2s ease;
  max-width: 100%;
  min-width: 0;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.org-mark:hover {
  background: white;
  border-color: var(--bs-line-strong);
}

.org-mark .dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--bs-link);
  flex-shrink: 0;
}

.org-mark.sponsor {
  background: var(--bs-code-bg);
  color: white;
  border-color: var(--bs-code-line);
  padding: 12px 18px;
  font-size: 13px;
}

.org-mark.sponsor .dot { background: var(--bs-accent); }

/* ============================================================
   CTA
   ============================================================ */
.vb-cta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 96px 32px;
}

.vb-cta h2 {
  font-size: 40px;
  line-height: 1.05;
  letter-spacing: 0;
  margin: 16px 0 16px;
  font-weight: 700;
}

.vb-cta p {
  font-size: 16px;
  color: var(--bs-muted);
  margin: 0 0 28px;
  max-width: 50ch;
}

/* ============================================================
   Footer
   ============================================================ */
.vb-footer {
  padding: 32px;
  border-top: 1px solid var(--bs-card-border);
  background: var(--bs-surface);
}

.vb-footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.vb-footer-meta {
  font-size: 11px;
  color: var(--bs-faint);
  font-family: var(--bs-fontmono);
  letter-spacing: 0.4px;
}

.vb-footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.vb-footer-links a {
  font-size: 12px;
  color: var(--bs-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.vb-footer-links a:hover { color: var(--bs-link); }

.vb-footer .vb-footer-row + .vb-footer-row {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--bs-card-border);
}

/* ============================================================
   Live EEG strip (vanilla JS-rendered SVG)
   ============================================================ */
.bs-eeg-channel {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 8px;
  align-items: center;
}

.bs-eeg-channel + .bs-eeg-channel { margin-top: 6px; }

.bs-eeg-channel .label {
  font-family: var(--bs-fontmono);
  font-size: 9px;
  color: var(--bs-faint);
  letter-spacing: 0.6px;
}

.bs-eeg-channel .strip {
  overflow: hidden;
  position: relative;
  height: 18px;
}

.bs-eeg-channel .strip svg {
  /* width and height are set as attributes by eeg.js based on measured strip
     pixel width — width is exactly 2x the strip width so the duplicated path
     tiles seamlessly and translateX(-50%) advances by one strip width. */
  display: block;
  animation: bs-eeg-scroll calc(var(--bs-eeg-speed, 16s) / var(--bs-anim-speed)) linear infinite;
}

.bs-eeg-channel .strip svg path {
  fill: none;
  stroke: var(--bs-link);
  stroke-width: 1.1;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ============================================================
   Responsive — collapse to mobile-B layout below 900px
   ============================================================ */
@media (max-width: 1100px) {
  .vb-hero { gap: 32px; padding: 48px 24px 56px; }
  .vb-hero-text h1 { font-size: 40px; }
  .vb-section { padding: 64px 24px; }
  .vb-section-head h2 { font-size: 30px; }
  .vb-cta h2 { font-size: 32px; }
  .vb-cta { padding: 72px 24px; }
  .vb-stats { grid-template-columns: repeat(3, 1fr); }
  .vb-stat:nth-child(3n) { border-right: none; }
  .vb-stat:nth-child(n+4) { border-top: 1px solid var(--bs-card-border); }
  .vb-models { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .vb-timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .phase-card:nth-child(2n) .phase-rail { right: 20px; }
  .vb-sponsors-grid { grid-template-columns: 1fr; gap: 28px; }
  .vb-sponsors { padding: 48px 24px; }
}

@media (max-width: 900px) {
  .vb-main {
    overflow-x: hidden;
  }

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

  .vb-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(84vw, 320px);
    max-width: calc(100vw - 44px);
    height: 100dvh;
    z-index: 30;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: 8px 0 32px rgba(15, 19, 32, 0.18);
  }

  .vb-sidebar.open { transform: translateX(0); }

  .vb-mobile-burger { display: inline-flex; }
  .vb-top-cta .desktop-only { display: none; }
  .vb-top { padding: 12px 18px; gap: 12px; }
  .vb-bread { font-size: 11px; gap: 6px; flex: 1; min-width: 0; overflow: hidden; }
  .vb-bread a,
  .vb-bread .sep { display: none; }
  .vb-bread strong {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .vb-hero {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 18px 40px;
  }
  .vb-hero-text h1 { font-size: 32px; }
  .vb-hero-text p { font-size: 14px; }

  .bs-card-head {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .vb-stats { grid-template-columns: repeat(2, 1fr); }
  .vb-stat { padding: 18px 16px; }
  .vb-stat:nth-child(2n) { border-right: none; }
  .vb-stat:nth-child(n+3) { border-top: 1px solid var(--bs-card-border); }
  .vb-stat:nth-child(n+4) { border-top: 1px solid var(--bs-card-border); }

  .vb-section { padding: 48px 18px; }
  .vb-section-head { grid-template-columns: 1fr; gap: 18px; align-items: start; }
  .vb-section-head h2 { font-size: 26px; }
  .vb-section-side { justify-self: stretch; }
  .vb-leader-tabs { justify-content: flex-start; }

  .vb-tracks { grid-template-columns: 1fr; }
  .vb-track { padding: 22px; }
  .vb-track h3 { font-size: 20px; }

  .vb-leader-row {
    grid-template-columns: 36px minmax(0, 1fr) 50px 56px 40px;
    padding: 12px 14px;
    gap: 10px;
    font-size: 12px;
  }
  .vb-leader-row.head { padding: 10px 14px; }

  .ds-table-wrap {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .ds-row { grid-template-columns: 80px 200px 50px 50px 60px 50px 70px 120px; min-width: 720px; }

  .vb-models { grid-template-columns: 1fr; }
  .vb-timeline { grid-template-columns: 1fr; gap: 18px; }
  .phase-card { padding: 18px; }
  .phase-card .phase-rail { display: none; }

  .vb-cta {
    grid-template-columns: 1fr;
    padding: 56px 18px;
    gap: 28px;
  }
  .vb-cta h2 { font-size: 28px; }

  .vb-footer { padding: 24px 18px; }
}

@media (max-width: 480px) {
  .vb-top {
    padding: 10px 12px;
  }

  .vb-top-cta .bs-pill.solid {
    padding: 7px 10px;
    font-size: 11px;
  }

  .vb-hero {
    padding: 28px 14px 36px;
  }

  .vb-section {
    padding: 40px 14px;
  }

  .vb-section-head h2 {
    font-size: 24px;
  }

  .vb-stats { grid-template-columns: 1fr; }
  .vb-stat { border-right: none; border-bottom: 1px solid var(--bs-card-border); padding: 16px 18px; }
  .vb-stat:last-child { border-bottom: none; }
  .vb-stat:nth-child(n) { border-top: none; }

  .vb-track-cta { flex-direction: column; align-items: stretch; }
  .vb-track-cta .bs-btn { justify-content: center; }
  .vb-track-cta .track-link { text-align: center; }

  .vb-track {
    padding: 18px;
  }

  .bs-hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .bs-hero-cta .bs-btn {
    width: 100%;
    justify-content: center;
  }

  .vb-leader-row {
    grid-template-columns: 32px minmax(0, 1fr) 42px 48px;
  }

  .vb-leader-row > span:nth-child(5) {
    display: none;
  }

  .vb-sponsors {
    padding: 40px 14px;
  }

  .org-mark {
    width: 100%;
  }

  .vb-cta {
    padding: 44px 14px;
  }
}

.ds-row .mod-emg { background: rgba(204, 73, 0, 0.12); color: #cc4900; }
.ds-row .mod-sleep { background: rgba(126, 63, 152, 0.12); color: #7e3f98; }