/* Study Visual System v2 — MOBILE FIRST */
.study-v2 {
  --sticky-h: 64px;
  padding-bottom: calc(var(--sticky-h) + 1.25rem);
  background: var(--white);
  color: var(--ink-text);
}

/* Compact mobile header (body class — header is outside main) */
.study-v2-page .site-header--solid {
  padding: .7rem 0;
}
.study-v2-page .site-header--solid .nav,
.study-v2-page .site-header--solid .btn-ghost {
  display: none;
}
.study-v2-page .header-actions {
  gap: .55rem;
}
.study-v2-page .header-search {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border: 1px solid rgba(244,247,251,.35);
  border-radius: 50%;
  color: #fff;
}
.study-v2-page .brand-logo { height: 44px; max-width: min(240px, 62vw); }
@media (min-width: 768px) {
  .study-v2-page .brand-logo { height: 52px; max-width: 280px; }
}

/* Hero — compact, optional visual */
.sv2-hero {
  position: relative;
  background: var(--ink-deep);
  color: var(--ivory);
  padding: 1.15rem 0 1.25rem;
  overflow: hidden;
}
.sv2-hero-copy { position: relative; z-index: 2; }
.sv2-hero-visual {
  display: none;
}
.sv2-crumb {
  margin: 0 0 .65rem;
  font-size: .68rem;
  letter-spacing: .04em;
  color: rgba(244,247,251,.55);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sv2-crumb a { color: rgba(244,247,251,.7); }
.sv2-crumb a:hover { color: #fff; }
.sv2-area {
  display: inline-block;
  margin: 0 0 .45rem;
  font-size: .62rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--slate-soft);
}
.sv2-hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.55rem, 5.5vw, 1.95rem);
  line-height: 1.15;
  letter-spacing: -.02em;
  margin: 0 0 .55rem;
  max-width: 22ch;
}
.sv2-lead {
  margin: 0 0 1rem;
  font-size: .92rem;
  line-height: 1.45;
  color: rgba(244,247,251,.78);
  max-width: 42ch;
}
.sv2-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem .75rem;
  margin-bottom: 1rem;
  font-size: .78rem;
  color: rgba(244,247,251,.72);
}
.sv2-hero-meta strong {
  color: #fff;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  font-size: .62rem;
  display: block;
  margin-bottom: .12rem;
}
.sv2-hero-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .55rem;
}
.sv2-hero-actions .btn-primary {
  margin: 0;
  padding: .75rem .6rem;
  font-size: .72rem;
  background: #fff;
  color: var(--ink-navy);
  border: 1px solid #fff;
}
.sv2-hero-actions .btn-primary:hover {
  background: var(--ivory);
  color: var(--ink-deep);
}
.sv2-hero-actions .btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-color: rgba(244,247,251,.4);
  color: #fff;
  border-radius: 9px;
  padding: .75rem .6rem;
  font-size: .72rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  font-weight: 600;
}

/* Quick facts — 2×2 mobile */
.sv2-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-bottom: 1px solid var(--line-light);
  background: var(--mist);
}
.sv2-fact {
  padding: .9rem 1rem;
  border-right: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
  min-height: 4.5rem;
}
.sv2-fact:nth-child(2n) { border-right: 0; }
.sv2-fact:nth-last-child(-n+2) { border-bottom: 0; }
.sv2-fact .lbl {
  display: block;
  font-size: .58rem;
  letter-spacing: .11em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--slate);
  margin-bottom: .3rem;
}
.sv2-fact .val {
  font-size: .92rem;
  line-height: 1.35;
  color: var(--ink-navy);
  font-weight: 600;
}

/* Sections */
.sv2-wrap {
  width: min(100% - 1.35rem, var(--max));
  margin-inline: auto;
}
.sv2-section {
  padding: 1.35rem 0 0;
}
.sv2-section h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.25rem;
  color: var(--ink-navy);
  margin: 0 0 .75rem;
  letter-spacing: -.01em;
}
.sv2-section p {
  margin: 0 0 .75rem;
  font-size: .95rem;
  line-height: 1.55;
  color: var(--ink-text);
  max-width: 62ch;
}

/* Accordion targets */
.sv2-acc {
  border-top: 1px solid var(--line-light);
}
.sv2-acc-item { border-bottom: 1px solid var(--line-light); }
.sv2-acc-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  min-height: 48px;
  padding: .85rem 0;
  border: 0;
  background: transparent;
  font: inherit;
  text-align: left;
  cursor: pointer;
  color: var(--ink-navy);
}
.sv2-acc-btn:focus-visible { outline: 2px solid var(--clinical); outline-offset: 2px; }
.sv2-acc-btn .left { display: flex; flex-direction: column; gap: .15rem; }
.sv2-acc-btn .k {
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  font-weight: 700;
}
.sv2-acc-btn .n {
  font-size: .82rem;
  color: var(--slate);
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
}
.sv2-acc-btn .chev {
  width: 28px; height: 28px;
  border: 1px solid var(--line-light);
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: .75rem;
  flex-shrink: 0;
  transition: transform .2s ease;
}
.sv2-acc-item.is-open .chev { transform: rotate(90deg); }
.sv2-acc-panel {
  display: none;
  padding: 0 0 1rem;
}
.sv2-acc-item.is-open .sv2-acc-panel { display: block; }
.sv2-chipgrid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .4rem .55rem;
}
.sv2-chipblock { margin: 0 0 1.1rem; }
.sv2-chipblock h3 {
  margin: 0 0 .55rem;
  font-size: .62rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--slate);
  font-weight: 700;
}
.sv2-req {
  margin: 0 0 1.15rem;
  padding-bottom: .85rem;
  border-bottom: 1px solid rgba(15,40,70,.08);
}
.sv2-req:last-child { border-bottom: 0; }
.sv2-req h3 {
  margin: 0 0 .55rem;
  font-size: .95rem;
  color: var(--ink-navy);
  font-weight: 600;
}
.sv2-muted {
  color: var(--slate);
  font-size: .86rem;
  line-height: 1.45;
}
.sv2-probe-search {
  margin: 0 0 1rem;
}
.sv2-probe-search input {
  width: 100%;
  max-width: 22rem;
  box-sizing: border-box;
  border: 1px solid rgba(15, 40, 70, .16);
  border-radius: 8px;
  padding: .65rem .85rem;
  font: inherit;
  font-size: .9rem;
  color: var(--ink-text);
  background: #fff;
}
.sv2-probe-search input:focus {
  outline: 2px solid rgba(47, 111, 237, .35);
  outline-offset: 1px;
}
.sv2-probe-count {
  margin: .45rem 0 0;
  font-size: .78rem;
  color: var(--slate);
}
.sv2-chipgrid span[hidden] { display: none !important; }
.sv2-chipblock[hidden] { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}
.sv2-chipgrid span {
  font-size: .8rem;
  line-height: 1.35;
  color: var(--ink-text);
  padding: .35rem 0;
  border-bottom: 1px solid rgba(15,40,70,.06);
}

/* Modality chooser (TB) */
.sv2-modes { display: grid; gap: .65rem; }
.sv2-mode {
  display: block;
  border: 1px solid var(--line-light);
  border-radius: 10px;
  padding: 1rem 1.05rem;
  background: var(--white);
  min-height: 44px;
}
.sv2-mode:hover { border-color: rgba(47,111,237,.35); }
.sv2-mode .num {
  font-size: .62rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--slate);
  margin-bottom: .25rem;
}
.sv2-mode h3 {
  margin: 0 0 .3rem;
  font-size: 1rem;
  color: var(--ink-navy);
  font-weight: 700;
}
.sv2-mode p {
  margin: 0;
  font-size: .86rem;
  color: var(--slate);
  line-height: 1.4;
  max-width: none;
}

/* Sample / method blocks */
.sv2-kv {
  display: grid;
  gap: .65rem;
  margin: 0;
}
.sv2-kv div {
  padding-bottom: .65rem;
  border-bottom: 1px solid var(--line-light);
}
.sv2-kv dt {
  font-size: .58rem;
  letter-spacing: .11em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--slate);
  margin-bottom: .2rem;
}
.sv2-kv dd {
  margin: 0;
  font-size: .92rem;
  line-height: 1.4;
  color: var(--ink-text);
}

/* Related */
.sv2-related { list-style: none; margin: 0; padding: 0; }
.sv2-related li { border-top: 1px solid var(--line-light); }
.sv2-related a {
  display: block;
  padding: .85rem 0;
  min-height: 44px;
  font-size: .92rem;
  font-weight: 600;
  color: var(--ink-text);
}
.sv2-related a:hover { color: var(--clinical); }

/* Closing CTA */
.sv2-close {
  margin: 1.75rem 0 0;
  padding: 1.25rem 0 1.5rem;
  border-top: 1px solid var(--line-light);
}
.sv2-close h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.2rem;
  margin: 0 0 .85rem;
  color: var(--ink-navy);
}
.sv2-close-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: .55rem;
}

/* Sticky bottom bar — mobile */
.sv2-sticky {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 40;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line-light);
  padding: .55rem .85rem calc(.55rem + env(safe-area-inset-bottom, 0px));
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .5rem;
}
.sv2-sticky a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border-radius: 9px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  text-align: center;
  padding: .55rem .4rem;
}
.sv2-sticky .primary {
  background: var(--ink-navy);
  color: #fff;
}
.sv2-sticky .secondary {
  border: 1px solid var(--line-light);
  color: var(--ink-navy);
  background: var(--white);
}

/* Local nav — hidden on mobile */
.sv2-localnav { display: none; }

@media (prefers-reduced-motion: reduce) {
  .sv2-acc-btn .chev { transition: none; }
}

/* ===== Tablet+ expand ===== */
@media (min-width: 768px) {
  .study-v2 { padding-bottom: 2rem; }
  .sv2-sticky { display: none; }
  .study-v2-page .site-header--solid .nav { display: flex; }
  .study-v2-page .site-header--solid .btn-ghost { display: inline-flex; }
  .study-v2-page .header-search { display: none; }
  .sv2-hero { padding: 2rem 0 1.75rem; }
  .sv2-hero h1 { font-size: clamp(1.9rem, 3vw, 2.55rem); max-width: 26ch; }
  .sv2-hero-actions { grid-template-columns: auto auto; max-width: 28rem; }
  .sv2-facts { grid-template-columns: repeat(4, 1fr); }
  .sv2-fact { border-bottom: 0; min-height: 5rem; padding: 1.1rem 1.15rem; }
  .sv2-fact:nth-child(2n) { border-right: 1px solid var(--line-light); }
  .sv2-fact:last-child { border-right: 0; }
  .sv2-chipgrid { grid-template-columns: repeat(3, 1fr); }
  .sv2-modes { grid-template-columns: 1fr 1fr; }
  .sv2-close-actions { grid-template-columns: auto auto; justify-content: start; }
  .sv2-localnav {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding: .75rem 0;
    border-bottom: 1px solid var(--line-light);
    position: sticky;
    top: 0;
    background: rgba(255,255,255,.96);
    z-index: 15;
    font-size: .72rem;
    letter-spacing: .06em;
    text-transform: uppercase;
    font-weight: 600;
  }
  .sv2-localnav a { color: var(--slate); white-space: nowrap; padding: .35rem 0; }
  .sv2-localnav a:hover { color: var(--ink-navy); }
}

/* Hero with family image — absolute right image; text stays in centered wrap */
@media (min-width: 900px) {
  .sv2-hero--visual {
    position: relative;
    display: block;
    min-height: 380px;
    padding: 2.4rem 0 2.35rem;
  }
  .sv2-hero--visual .sv2-wrap {
    position: relative;
    z-index: 2;
    display: block;
    /* keep site alignment: same as .wrap / header */
    width: min(100% - 2.75rem, var(--max, 1200px));
    max-width: var(--max, 1200px);
    margin-inline: auto;
    padding: 0;
    box-sizing: border-box;
  }
  .sv2-hero--visual .sv2-hero-copy {
    position: relative;
    z-index: 2;
    max-width: min(34rem, 48%);
    width: 100%;
  }
  .sv2-hero--visual .sv2-hero-visual {
    display: block;
    position: absolute;
    inset: 0 0 0 44%;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
  }
  .sv2-hero--visual .sv2-hero-visual picture,
  .sv2-hero--visual .sv2-hero-visual img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center right;
  }
  .sv2-hero--visual .sv2-hero-visual-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
      90deg,
      var(--ink-deep) 0%,
      rgba(7, 22, 40, .9) 16%,
      rgba(7, 22, 40, .5) 48%,
      rgba(7, 22, 40, .12) 100%
    );
    pointer-events: none;
  }
}
@media (max-width: 899px) {
  .sv2-hero--visual {
    display: flex;
    flex-direction: column;
    padding-bottom: 0;
  }
  .sv2-hero--visual .sv2-wrap {
    width: min(100% - 1.35rem, var(--max, 1200px));
    margin-inline: auto;
  }
  .sv2-hero--visual .sv2-hero-visual {
    display: block;
    order: 2;
    position: relative;
    height: 118px;
    margin: .35rem 0 0;
    overflow: hidden;
  }
  .sv2-hero--visual .sv2-hero-visual picture,
  .sv2-hero--visual .sv2-hero-visual img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 35%;
  }
  .sv2-hero--visual .sv2-hero-visual-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
      180deg,
      rgba(7, 22, 40, .55) 0%,
      rgba(7, 22, 40, .15) 55%,
      rgba(7, 22, 40, .7) 100%
    );
    pointer-events: none;
  }
}

/* Desktop PRO — editorial shell */
@media (min-width: 1100px) {
  .sv2-hero {
    padding: 2.6rem 0 2.2rem;
    background:
      radial-gradient(ellipse 70% 80% at 92% 18%, rgba(47,111,237,.18), transparent 55%),
      linear-gradient(165deg, #071428 0%, var(--ink-deep) 48%, #0c1f3a 100%);
  }
  .sv2-hero--visual {
    padding: 2.6rem 0 2.4rem;
    min-height: 420px;
    background: var(--ink-deep);
  }
  .sv2-hero--visual .sv2-hero-copy {
    max-width: min(36rem, 46%);
  }
  .sv2-hero--visual .sv2-hero-visual {
    inset: 0 0 0 46%;
  }
  .sv2-hero:not(.sv2-hero--visual) .sv2-wrap {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(240px, .75fr);
    gap: 2.5rem;
    align-items: end;
  }
  .sv2-hero-side {
    display: block;
    border-left: 1px solid rgba(244,247,251,.14);
    padding-left: 1.5rem;
  }
  .sv2-hero-side .row {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: .35rem .85rem;
    padding: .55rem 0;
    border-bottom: 1px solid rgba(244,247,251,.1);
    font-size: .86rem;
  }
  .sv2-hero-side .row:last-child { border-bottom: 0; }
  .sv2-hero-side .row span {
    font-size: .58rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    font-weight: 700;
    color: rgba(244,247,251,.5);
    align-self: center;
  }
  .sv2-hero-side .row strong {
    color: #fff;
    font-weight: 600;
    line-height: 1.35;
  }
  .sv2-facts {
    border-bottom: 0;
    outline: 1px solid var(--line-light);
    outline-offset: -1px;
  }
  .sv2-fact .val { font-size: 1rem; }
  .sv2-section { padding: 1.85rem 0 0; }
  .sv2-section h2 { font-size: 1.55rem; margin-bottom: 1rem; }
  .sv2-shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 2.75rem;
    align-items: start;
    padding: 1.25rem 0 2rem;
  }
  .sv2-aside {
    position: sticky;
    top: 4.25rem;
    border: 1px solid var(--line-light);
    border-radius: 10px;
    padding: 1.35rem 1.25rem;
    background: linear-gradient(180deg, var(--mist), var(--white));
  }
  .sv2-aside h2 {
    margin: 0 0 .85rem;
    font-family: var(--sans);
    font-size: .62rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--ink-navy);
  }
  .sv2-aside .sv2-kv { margin-bottom: 1rem; }
  .sv2-aside .btn-primary {
    margin-top: .35rem;
    width: 100%;
    text-align: center;
    justify-content: center;
  }
  .sv2-aside .text-link {
    display: block;
    margin-top: .75rem;
    font-size: .82rem;
  }
  .sv2-modes { grid-template-columns: 1fr; gap: .75rem; }
  .sv2-mode {
    padding: 1.15rem 1.2rem;
    transition: border-color .2s ease, background .2s ease;
  }
  .sv2-mode:hover { background: var(--mist); }
  .sv2-chipgrid { grid-template-columns: repeat(4, 1fr); gap: .2rem .85rem; }
  .sv2-close {
    margin-top: 2.5rem;
    padding: 2rem 0 2.25rem;
    background: var(--mist);
    border-top: 0;
  }
  .sv2-close .sv2-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
  }
  .sv2-close h2 { margin: 0; font-size: 1.45rem; }
  .sv2-close-actions { margin: 0; }
  .sv2-related a { padding: 1rem 0; font-size: 1rem; }
}

/* hide desktop hero side on small */
.sv2-hero-side { display: none; }
@media (min-width: 1100px) {
  .sv2-hero-side { display: block; }
}