/* ============================================================
   Celva Bio — Sub-page styles
   Layered on top of site.css + hub.css.
   Used by joint/iv/neuro/research sub-pages.
   ============================================================ */

/* ============ SUB HERO (simpler than hub-hero) ============ */
.sub-hero {
  position: relative;
  background: var(--hub-hero-bg, var(--surface-tint));
  padding: clamp(48px, 6vw, 88px) clamp(20px, 4vw, 56px) clamp(48px, 6vw, 80px);
  border-bottom: 1px solid var(--border);
}
.sub-hero--dark {
  background: var(--ink);
  border-bottom: 0;
}
.sub-hero__inner {
  max-width: 1240px; margin: 0 auto;
  display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(32px, 5vw, 80px);
  align-items: start;
}
.sub-hero__eyebrow {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--hub-accent); margin-bottom: 22px;
}
.sub-hero--dark .sub-hero__eyebrow { color: var(--hub-accent-ice); }
.sub-hero h1 {
  font-family: var(--font-display); font-weight: 300;
  font-size: clamp(2.5rem, 5vw, 4.8rem); line-height: 1.02;
  letter-spacing: -0.02em; color: var(--ink); margin: 0 0 24px;
  text-wrap: balance;
}
.sub-hero h1 em { font-style: italic; color: var(--hub-accent); font-weight: 400; }
.sub-hero--dark h1 { color: #fff; }
.sub-hero--dark h1 em { color: var(--hub-accent-ice); }
.sub-hero__lede {
  font-size: 18px; line-height: 1.65; color: var(--ink-soft);
  max-width: 54ch; margin: 0 0 28px;
}
.sub-hero--dark .sub-hero__lede { color: rgba(255,255,255,0.75); }
.sub-hero__answer {
  background: rgba(255,255,255,0.06);
  border-left: 2px solid var(--hub-accent-ice);
  padding: 18px 22px; margin: 0 0 28px;
}
.sub-hero__answer p { margin: 0; font-size: 15.5px; line-height: 1.65; color: rgba(255,255,255,0.88); max-width: 56ch; }
.sub-hero__actions {
  display: flex; gap: 24px; align-items: center; flex-wrap: wrap; margin-top: 8px;
}

/* Sub-hero right: fact stack OR image */
.sub-hero__facts {
  display: flex; flex-direction: column; gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.sub-hero--dark .sub-hero__facts { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.12); }
.sub-hero__fact { background: #fff; padding: 20px 22px; }
.sub-hero--dark .sub-hero__fact { background: rgba(255,255,255,0.04); }
.sub-hero__fact-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--hub-accent); margin-bottom: 8px;
}
.sub-hero--dark .sub-hero__fact-label { color: var(--hub-accent-ice); }
.sub-hero__fact-n {
  font-family: var(--font-display); font-weight: 300;
  font-size: 28px; line-height: 1.05; color: var(--ink); margin-bottom: 4px;
}
.sub-hero__fact-n em { font-style: italic; color: var(--hub-accent); font-weight: 400; }
.sub-hero--dark .sub-hero__fact-n { color: #fff; }
.sub-hero--dark .sub-hero__fact-n em { color: var(--hub-accent-ice); }
.sub-hero__fact-text { font-size: 13.5px; line-height: 1.5; color: var(--ink-muted); margin: 0; max-width: 38ch; }
.sub-hero--dark .sub-hero__fact-text { color: rgba(255,255,255,0.58); }

.sub-hero__image {
  aspect-ratio: 4 / 5; background: #e8e5dc; overflow: hidden; position: relative;
}
.sub-hero__image img { width: 100%; height: 100%; object-fit: cover; }
.sub-hero__image-cap {
  position: absolute; top: 18px; left: 18px;
  background: rgba(255,255,255,0.94); padding: 8px 12px;
  font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink);
}

/* ============ TWO-COL SECTION ============ */
.two-col {
  display: grid; grid-template-columns: 1fr 1.2fr;
  gap: clamp(32px, 6vw, 88px); align-items: start;
}
.two-col--even { grid-template-columns: 1fr 1fr; }
.two-col--flip { grid-template-columns: 1.2fr 1fr; }
.two-col p {
  font-size: 16px; line-height: 1.75; color: var(--ink-soft);
  margin: 0 0 18px; max-width: 56ch;
}
.two-col p:last-child { margin-bottom: 0; }
.hub-section--dark .two-col p { color: rgba(255,255,255,0.74); }

/* ============ CARD STACK (for options, variants, items) ============ */
.sub-stack {
  display: flex; flex-direction: column;
  gap: 1px; background: var(--border);
  border: 1px solid var(--border);
}
.sub-card {
  background: #fff; padding: 26px clamp(22px, 2.4vw, 32px);
  border-left: 3px solid transparent;
  transition: border-color 220ms, background 220ms;
}
.sub-card:hover { border-left-color: var(--hub-accent); background: var(--hub-accent-soft); }
.sub-card__label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--hub-accent); margin-bottom: 8px;
}
.sub-card__title {
  font-family: var(--font-display); font-weight: 400;
  font-size: 20px; line-height: 1.2; color: var(--ink); margin: 0 0 8px;
}
.sub-card__title em { font-style: italic; color: var(--hub-accent); }
.sub-card__text { font-size: 14.5px; line-height: 1.65; color: var(--ink-soft); margin: 0; }
.sub-card__meta {
  margin-top: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px; letter-spacing: 0.08em; color: var(--ink-muted);
}

/* Dark variant (used inside hub-section--dark) */
.hub-section--dark .sub-stack { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.12); }
.hub-section--dark .sub-card { background: rgba(255,255,255,0.03); }
.hub-section--dark .sub-card:hover { background: rgba(255,255,255,0.06); border-left-color: var(--hub-accent-ice); }
.hub-section--dark .sub-card__label { color: var(--hub-accent-ice); }
.hub-section--dark .sub-card__title { color: #fff; }
.hub-section--dark .sub-card__title em { color: var(--hub-accent-ice); }
.hub-section--dark .sub-card__text { color: rgba(255,255,255,0.65); }
.hub-section--dark .sub-card__meta { color: rgba(255,255,255,0.5); }

/* ============ STEP LIST ============ */
.sub-steps { display: flex; flex-direction: column; }
.sub-step {
  display: grid; grid-template-columns: 72px 1fr;
  gap: 20px; padding: 22px 0; border-top: 1px solid var(--border);
  align-items: start;
}
.sub-step:last-child { border-bottom: 1px solid var(--border); }
.sub-step__n {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--hub-accent); padding-top: 4px;
}
.sub-step h4 {
  font-family: var(--font-display); font-weight: 400;
  font-size: 20px; line-height: 1.22; color: var(--ink); margin: 0 0 8px;
}
.sub-step p { font-size: 15px; line-height: 1.65; color: var(--ink-soft); margin: 0 0 8px; max-width: 64ch; }
.sub-step__meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px; letter-spacing: 0.08em; color: var(--ink-muted);
}
.hub-section--dark .sub-step { border-color: rgba(255,255,255,0.12); }
.hub-section--dark .sub-step__n { color: var(--hub-accent-ice); }
.hub-section--dark .sub-step h4 { color: #fff; }
.hub-section--dark .sub-step p { color: rgba(255,255,255,0.72); }

/* ============ TIMELINE (vertical, checkpoint-style) ============ */
.sub-timeline {
  position: relative; padding-left: 32px;
  border-left: 1px solid var(--border);
}
.sub-timeline__pt { padding: 0 0 32px 16px; position: relative; }
.sub-timeline__pt:last-child { padding-bottom: 0; }
.sub-timeline__pt::before {
  content: '';
  position: absolute; left: -22px; top: 6px;
  width: 10px; height: 10px; border-radius: 50%;
  background: #fff; border: 2px solid var(--hub-accent);
}
.sub-timeline__pt--emphasis::before { background: var(--hub-accent); }
.sub-timeline__when {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--hub-accent); margin-bottom: 6px;
}
.sub-timeline__pt h5 {
  font-family: var(--font-display); font-weight: 400;
  font-size: 18px; line-height: 1.22; color: var(--ink); margin: 0 0 6px;
}
.sub-timeline__pt p { font-size: 14.5px; line-height: 1.65; color: var(--ink-muted); margin: 0; max-width: 54ch; }

/* Dark variant (used inside hub-section--dark) */
.hub-section--dark .sub-timeline { border-left-color: rgba(255,255,255,0.18); }
.hub-section--dark .sub-timeline__pt::before { background: var(--navy-brand); border-color: var(--hub-accent-ice); }
.hub-section--dark .sub-timeline__pt--emphasis::before { background: var(--hub-accent-ice); }
.hub-section--dark .sub-timeline__when { color: var(--hub-accent-ice); }
.hub-section--dark .sub-timeline__pt h5 { color: #fff; }
.hub-section--dark .sub-timeline__pt p { color: rgba(255,255,255,0.74); }

/* ============ HONEST BOX (inline emphasis) ============ */
.sub-note {
  background: var(--navy-brand);
  border-left: 3px solid var(--hub-accent-ice);
  padding: 24px clamp(22px, 2.4vw, 32px);
  color: #fff;
  margin: 24px 0;
}
.sub-note__label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--hub-accent-ice); margin-bottom: 10px;
}
.sub-note p { margin: 0; font-size: 15.5px; line-height: 1.7; color: rgba(255,255,255,0.78); max-width: 62ch; }
.sub-note p + p { margin-top: 10px; }

.sub-note--light {
  background: var(--surface-tint); color: var(--ink);
  border-left-color: var(--hub-accent);
}
.sub-note--light .sub-note__label { color: var(--hub-accent); }
.sub-note--light p { color: var(--ink-soft); }

/* ============ COMPARE TABLE (option vs option grid) ============ */
.sub-compare {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--border); border: 1px solid var(--border);
}
.sub-compare__cell { background: #fff; padding: 28px clamp(22px, 2.2vw, 28px); display: flex; flex-direction: column; }
.sub-compare__cell-h {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--hub-accent); margin-bottom: 14px;
}
.sub-compare__cell-t {
  font-family: var(--font-display); font-weight: 400;
  font-size: 22px; line-height: 1.2; color: var(--ink); margin: 0 0 12px;
}
.sub-compare__cell-p { font-size: 14px; line-height: 1.65; color: var(--ink-muted); margin: 0 0 16px; flex: 1; }
.sub-compare__cell ul {
  list-style: none; padding: 14px 0 0; margin: 0;
  border-top: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 8px;
  font-size: 13px; color: var(--ink-soft);
}
.sub-compare__cell li { padding-left: 14px; position: relative; line-height: 1.5; }
.sub-compare__cell li::before { content: '—'; position: absolute; left: 0; color: var(--hub-accent); }
.sub-compare__cell--primary { background: var(--hub-accent-soft); }
.sub-compare__cell--primary .sub-compare__cell-t { color: var(--hub-accent); }

/* ============ DOWNLOAD CARD (for the checklist PDF) ============ */
.sub-dl {
  display: grid; grid-template-columns: 1.1fr 1fr;
  gap: clamp(28px, 4vw, 56px); align-items: center;
  padding: clamp(36px, 5vw, 56px);
  background: var(--surface-tint);
  border: 1px solid var(--border);
  position: relative; overflow: hidden;
}
.sub-dl::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--hub-accent);
}
.sub-dl__label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--hub-accent); margin-bottom: 14px;
}
.sub-dl h3 {
  font-family: var(--font-display); font-weight: 300;
  font-size: clamp(1.75rem, 2.8vw, 2.4rem); line-height: 1.1;
  color: var(--ink); margin: 0 0 14px;
  letter-spacing: -0.012em;
}
.sub-dl h3 em { font-style: italic; color: var(--hub-accent); font-weight: 400; }
.sub-dl p { font-size: 15.5px; line-height: 1.65; color: var(--ink-soft); margin: 0 0 22px; max-width: 52ch; }

.sub-dl__card {
  background: #fff; border: 1px solid var(--border);
  padding: 28px;
  display: flex; flex-direction: column; gap: 14px;
  position: relative;
}
.sub-dl__card-head {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 14px;
  padding-bottom: 16px; border-bottom: 1px solid var(--border);
}
.sub-dl__card-title { font-family: var(--font-display); font-weight: 400; font-size: 18px; line-height: 1.22; color: var(--ink); margin: 0; }
.sub-dl__card-meta { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-muted); margin-top: 4px; }
.sub-dl__card-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; background: var(--hub-accent-soft);
  border-radius: 2px;
  font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 0.1em;
  color: var(--hub-accent); flex-shrink: 0;
}
.sub-dl__card ul {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 6px;
  font-size: 13.5px; color: var(--ink-soft);
}
.sub-dl__card li { padding-left: 18px; position: relative; line-height: 1.5; }
.sub-dl__card li::before {
  content: ''; position: absolute; left: 0; top: 7px;
  width: 10px; height: 6px;
  border-left: 2px solid var(--hub-accent);
  border-bottom: 2px solid var(--hub-accent);
  transform: rotate(-45deg);
}
.sub-dl__card-foot { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--border); display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }

/* ============ RELATED ROW ============ */
.sub-related {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--border); border: 1px solid var(--border);
}
.sub-related__card {
  background: #fff; padding: 28px; display: block;
  border: 0; color: var(--ink);
  border-top: 2px solid transparent;
  transition: border-color 220ms, background 220ms;
}
.sub-related__card:hover { border-top-color: var(--hub-accent); background: var(--hub-accent-soft); color: var(--ink); }
.sub-related__card:hover .sub-related__arrow { transform: translateX(4px); color: var(--hub-accent); }
.sub-related__label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--hub-accent); margin-bottom: 10px;
}
.sub-related__title {
  font-family: var(--font-display); font-weight: 400;
  font-size: 20px; line-height: 1.22; color: var(--ink); margin: 0 0 8px;
}
.sub-related__text { font-size: 14px; line-height: 1.6; color: var(--ink-muted); margin: 0 0 18px; }
.sub-related__arrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-muted); display: inline-block;
  transition: transform 220ms, color 220ms;
}

/* ============ MID CTA (link back to hub) ============ */
.sub-back {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-muted); border: 0;
}
.sub-back:hover { color: var(--hub-accent); }
.sub-back::before { content: '←'; }

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .sub-hero__inner { grid-template-columns: 1fr; gap: 40px; }
  .two-col, .two-col--even, .two-col--flip { grid-template-columns: 1fr; gap: 40px; }
  .sub-compare { grid-template-columns: 1fr; }
  .sub-dl { grid-template-columns: 1fr; }
  .sub-related { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .sub-step { grid-template-columns: 1fr; gap: 8px; padding: 18px 0; }
  .sub-timeline { padding-left: 24px; }
}