/* =========================================================
   SOST LABS — BUSINESS DIGITAL STRUCTURE SERIES
========================================================= */

.labs-series-hero {
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--header-height) + 110px);
  padding-bottom: 96px;
  border-bottom: 1px solid var(--line);
}

.labs-series-hero::after {
  position: absolute;
  top: 72px;
  right: -6vw;
  width: min(520px, 42vw);
  aspect-ratio: 1;
  border: 1px solid rgba(167,183,255,.08);
  border-radius: 50%;
  box-shadow:
    0 0 0 54px rgba(167,183,255,.025),
    0 0 0 108px rgba(167,183,255,.018);
  content: '';
  pointer-events: none;
}

.labs-series-hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(360px, .82fr);
  gap: clamp(60px, 8vw, 130px);
  align-items: end;
}

.labs-series-hero h1 {
  max-width: 900px;
  margin-top: 24px;
  font-size: clamp(48px, 5.15vw, 76px);
  font-weight: 470;
  line-height: 1.08;
  letter-spacing: -.057em;
}

.labs-series-hero h1 span {
  color: var(--point);
}

.labs-series-intro {
  padding-bottom: 8px;
}

.labs-series-intro > p {
  color: var(--text-soft);
  font-size: 18px;
  line-height: 1.85;
}

.labs-series-intro strong {
  color: var(--text);
  font-weight: 600;
}

.labs-series-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1px;
  margin-top: 34px;
  background: var(--line);
}

.labs-series-meta div {
  min-height: 96px;
  padding: 18px;
  background: var(--bg);
}

.labs-series-meta small {
  display: block;
  color: var(--text-muted);
  font-size: 10px;
  letter-spacing: .1em;
}

.labs-series-meta strong {
  display: block;
  margin-top: 10px;
  color: var(--point);
  font-size: 16px;
  font-weight: 590;
}

.labs-diagnostic {
  padding: 74px 0 78px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}

.labs-diagnostic-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 38px;
}

.labs-diagnostic-head h2 {
  margin-top: 10px;
  font-size: clamp(28px, 2.7vw, 40px);
  font-weight: 510;
  letter-spacing: -.04em;
}

.labs-diagnostic-head > p {
  max-width: 470px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.labs-diagnostic-track {
  display: grid;
  grid-template-columns: repeat(6, minmax(0,1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.labs-diagnostic-track a {
  position: relative;
  min-height: 175px;
  padding: 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background .25s ease, transform .25s ease;
}

.labs-diagnostic-track a:hover {
  z-index: 2;
  background: rgba(167,183,255,.045);
  transform: translateY(-3px);
}

.labs-diagnostic-track span {
  color: var(--point);
  font-size: 11px;
  letter-spacing: .08em;
}

.labs-diagnostic-track strong {
  display: block;
  margin-top: 52px;
  font-size: 15px;
  font-weight: 580;
  line-height: 1.45;
}

.labs-diagnostic-track small {
  display: block;
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 10px;
  letter-spacing: .05em;
}

.business-chapter {
  position: relative;
  padding: 120px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.business-chapter:nth-of-type(even) {
  background: var(--bg-soft);
}

.business-chapter-head {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: clamp(40px, 7vw, 110px);
  align-items: start;
}

.business-chapter-index {
  display: flex;
  gap: 12px;
  align-items: baseline;
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: .1em;
}

.business-chapter-index strong {
  color: var(--point);
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -.03em;
}

.business-chapter-title .eyebrow {
  color: var(--point);
}

.business-chapter-title h2 {
  max-width: 1030px;
  margin-top: 16px;
  font-size: clamp(34px, 3.8vw, 56px);
  font-weight: 490;
  line-height: 1.17;
  letter-spacing: -.052em;
}

.business-chapter-title > p {
  max-width: 870px;
  margin-top: 24px;
  color: var(--text-soft);
  font-size: 18px;
  line-height: 1.85;
}

.business-chapter-grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 18px;
  margin-top: 58px;
  margin-left: calc(170px + clamp(40px, 7vw, 110px));
}

.chapter-problem,
.chapter-solution {
  min-height: 390px;
  padding: 30px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.012);
}

.chapter-problem > span,
.chapter-solution > span,
.chapter-checklist > span {
  color: var(--point);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: .11em;
}

.chapter-problem h3,
.chapter-solution h3 {
  margin-top: 46px;
  font-size: 25px;
  font-weight: 540;
  line-height: 1.35;
  letter-spacing: -.035em;
}

.chapter-problem > p,
.chapter-solution > p {
  margin-top: 20px;
  color: var(--text-soft);
  font-size: 16px;
  line-height: 1.82;
}

.chapter-signals {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
}

.chapter-signals li {
  position: relative;
  padding: 15px 16px 15px 42px;
  background: var(--bg);
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.55;
}

.chapter-signals li::before {
  position: absolute;
  top: 18px;
  left: 17px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--point);
  content: '';
}

.chapter-solution-flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 10px;
  margin-top: 30px;
}

.chapter-solution-flow div {
  position: relative;
  min-height: 118px;
  padding: 17px;
  border: 1px solid var(--line);
  background: var(--bg);
}

.chapter-solution-flow div:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -16px;
  z-index: 3;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--bg);
  color: var(--point);
  content: '→';
  transform: translateY(-50%);
}

.chapter-solution-flow small {
  color: var(--text-muted);
  font-size: 9px;
  letter-spacing: .09em;
}

.chapter-solution-flow strong {
  display: block;
  margin-top: 20px;
  font-size: 14px;
  font-weight: 570;
  line-height: 1.5;
}

.chapter-checklist {
  margin-top: 18px;
  margin-left: calc(170px + clamp(40px, 7vw, 110px));
  padding: 28px 30px;
  border: 1px solid rgba(167,183,255,.25);
  background: rgba(167,183,255,.035);
}

.chapter-checklist h3 {
  margin-top: 10px;
  font-size: 20px;
  font-weight: 560;
}

.chapter-checklist ul {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 10px 28px;
  margin-top: 20px;
}

.chapter-checklist li {
  position: relative;
  padding-left: 22px;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.65;
}

.chapter-checklist li::before {
  position: absolute;
  top: 7px;
  left: 0;
  width: 10px;
  height: 10px;
  border: 1px solid rgba(167,183,255,.55);
  content: '';
}

.labs-series-closing {
  padding: 110px 0;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 76% 22%, rgba(167,183,255,.08), transparent 30%),
    var(--bg-soft);
}

.labs-series-closing-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(330px, .8fr);
  gap: 80px;
  align-items: end;
}

.labs-series-closing h2 {
  max-width: 900px;
  margin-top: 16px;
  font-size: clamp(38px, 4.3vw, 62px);
  font-weight: 480;
  line-height: 1.18;
  letter-spacing: -.055em;
}

.labs-series-closing p:not(.eyebrow) {
  max-width: 760px;
  margin-top: 24px;
  color: var(--text-soft);
  font-size: 17px;
  line-height: 1.82;
}

.labs-series-closing-actions {
  display: grid;
  gap: 12px;
}

.labs-series-closing-actions a {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  padding: 0 22px;
  border: 1px solid var(--line-strong);
  color: var(--text-soft);
  font-size: 15px;
  font-weight: 600;
  transition: background .25s ease, border-color .25s ease, transform .25s ease;
}

.labs-series-closing-actions a:first-child {
  border-color: var(--point);
  background: var(--point);
  color: #08090b;
}

.labs-series-closing-actions a:hover {
  transform: translateY(-3px);
}

@media (max-width: 1100px) {
  .labs-series-hero-grid,
  .labs-series-closing-grid {
    grid-template-columns: 1fr;
  }

  .labs-diagnostic-track {
    grid-template-columns: repeat(3, 1fr);
  }

  .business-chapter-head {
    grid-template-columns: 120px minmax(0,1fr);
  }

  .business-chapter-grid,
  .chapter-checklist {
    margin-left: calc(120px + clamp(40px, 7vw, 110px));
  }

  .business-chapter-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .labs-series-hero {
    padding-top: calc(var(--header-height) + 74px);
    padding-bottom: 70px;
  }

  .labs-series-hero-grid {
    gap: 40px;
  }

  .labs-series-hero h1 {
    font-size: 44px;
  }

  .labs-series-intro > p {
    font-size: 16px;
  }

  .labs-diagnostic {
    padding: 58px 0;
  }

  .labs-diagnostic-head {
    display: block;
  }

  .labs-diagnostic-head > p {
    margin-top: 16px;
  }

  .labs-diagnostic-track {
    grid-template-columns: repeat(2, 1fr);
  }

  .labs-diagnostic-track a {
    min-height: 150px;
  }

  .business-chapter {
    padding: 80px 0;
  }

  .business-chapter-head {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .business-chapter-grid,
  .chapter-checklist {
    margin-left: 0;
  }

  .business-chapter-grid {
    margin-top: 38px;
  }

  .business-chapter-title h2 {
    font-size: 34px;
  }

  .business-chapter-title > p {
    font-size: 16px;
  }

  .chapter-problem,
  .chapter-solution {
    min-height: 0;
    padding: 24px;
  }

  .chapter-solution-flow {
    grid-template-columns: 1fr;
  }

  .chapter-solution-flow div:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -20px;
    content: '↓';
    transform: translateX(50%);
  }

  .chapter-checklist ul {
    grid-template-columns: 1fr;
  }

  .labs-series-closing {
    padding: 78px 0;
  }

  .labs-series-closing h2 {
    font-size: 38px;
  }
}