:root {
  --bg: #f2f2f0;
  --surface: #fafaf8;
  --ink: #0a0a0a;
  --ink-soft: #5c5c57;
  --rule: #bebeb8;
  --signal: #a01824;
  --signal-soft: #d9a2a8;
  --futvia-red: rgb(202, 58, 50);

  --font-display: "Bebas Neue", sans-serif;
  --font-body: "Archivo", sans-serif;

  --fs-00: 0.72rem;
  --fs-0: 0.85rem;
  --fs-1: 1rem;
  --fs-2: 1.2rem;
  --fs-3: 1.6rem;
  --fs-4: 2.15rem;
  --fs-5: 3.1rem;
  --fs-6: 4.2rem;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.75rem;
  --space-8: 3.5rem;
  --space-9: 4.5rem;
  --space-10: 6rem;

  --rule-w: 1px;
  --rail-w: 240px;
  --max-content: 1440px;

  --dur-fast: 140ms;
  --dur-med: 200ms;
  --ease: linear;
  --top-nav-h: 4.4rem;
}

.brand-futvia {
  color: var(--futvia-red);
  font-weight: 700;
}

.cta .brand-futvia,
button .brand-futvia,
.futvia .chapter-head h1 .brand-futvia {
  color: inherit;
  font-weight: inherit;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.page-shell {
  width: 100%;
  padding-top: var(--top-nav-h);
}

.top-quick-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: var(--bg);
  border-bottom: var(--rule-w) solid var(--ink);
  transform: translateY(0);
  opacity: 1;
  transition: transform var(--dur-med) var(--ease), opacity var(--dur-med) var(--ease);
}

.top-quick-nav.is-hidden {
  transform: translateY(calc(-1 * var(--top-nav-h)));
  opacity: 0;
  pointer-events: none;
}

.top-quick-nav__inner {
  width: min(100%, var(--max-content));
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
}

.top-quick-nav__inner a {
  flex: 0 0 auto;
  border: var(--rule-w) solid var(--ink);
  background: #fff;
  color: var(--ink);
  min-height: 2.7rem;
  padding: 0.65rem 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  word-spacing: 0.16em;
  font-size: var(--fs-00);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  box-shadow: 3px 3px 0 var(--ink);
  transform: translate(0, 0);
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.top-quick-nav__inner a.is-call {
  background: var(--signal);
  border-color: var(--signal);
  color: #fff;
}

.top-quick-nav__inner a.is-live {
  position: relative;
  padding-left: 0.9rem;
  box-shadow: 3px 3px 0 var(--ink), 0 0 0 rgba(202, 58, 50, 0);
}

.top-quick-nav__inner a.is-live::after {
  content: "";
  position: relative;
  display: inline-block;
  margin-left: 0.38rem;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 999px;
  background: rgb(202, 58, 50);
  box-shadow: 0 0 0 rgba(202, 58, 50, 0.55);
  animation: livePulse 1.9s linear infinite;
  vertical-align: middle;
}

.top-quick-nav__inner a:hover,
.top-quick-nav__inner a:focus-visible {
  background: var(--surface);
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--ink);
}

.top-quick-nav__inner a.is-call:hover,
.top-quick-nav__inner a.is-call:focus-visible {
  background: #7f141d;
  border-color: #7f141d;
}

.top-quick-nav__inner a.is-live:hover,
.top-quick-nav__inner a.is-live:focus-visible {
  box-shadow: 5px 5px 0 var(--ink), 0 0 12px rgba(202, 58, 50, 0.28);
}

.top-quick-nav__inner a:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 var(--ink);
}

@keyframes livePulse {
  0% {
    box-shadow: 0 0 0 0 rgba(202, 58, 50, 0.58);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(202, 58, 50, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(202, 58, 50, 0);
  }
}

.chapter-rail {
  display: none;
}

.case-main {
  width: min(100%, var(--max-content));
  margin: 0 auto;
  padding: var(--space-4);
}

.mobile-index {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  padding: var(--space-3) 0;
  border-bottom: var(--rule-w) solid var(--ink);
  background: var(--bg);
}

.mobile-index a {
  flex: 0 0 auto;
  border: var(--rule-w) solid var(--ink);
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-00);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
}

.chapter {
  border-top: var(--rule-w) solid var(--ink);
  padding: var(--space-8) 0;
}

.chapter-head {
  margin-bottom: var(--space-6);
}

.chapter-kicker {
  margin: 0 0 var(--space-4);
  font-size: var(--fs-00);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--signal);
}

.chapter h1,
.chapter h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-6);
  line-height: 0.9;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.chapter h3 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-size: var(--fs-4);
  line-height: 0.92;
  text-transform: uppercase;
}

.chapter p,
.chapter li {
  font-size: var(--fs-1);
  color: var(--ink-soft);
}

.chapter p,
.chapter ul,
.chapter ol {
  max-width: 72ch;
}

.chapter p {
  margin: 0;
  line-height: 1.68;
}

.chapter p + p {
  margin-top: var(--space-4);
}

.chapter p + ul,
.chapter p + ol {
  margin-top: var(--space-3);
}

.chapter ul + p,
.chapter ol + p {
  margin-top: var(--space-3);
}

.chapter-subtitle {
  margin-top: var(--space-4);
  max-width: 56rem;
  color: var(--ink-soft);
  font-weight: 700;
  font-family: var(--font-body);
  font-size: var(--fs-2);
  line-height: 1.3;
  text-transform: none;
}

.futvia-grid,
.role-grid,
.stage-grid,
.context-grid,
.mvp-grid,
.research-band,
.trust-grid,
.validation-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.futvia {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}

.futvia .chapter-head {
  margin-bottom: var(--space-8);
}

.futvia .chapter-head h1 {
  font-size: clamp(7rem, 24vw, 19rem);
  line-height: 0.78;
  letter-spacing: 0;
}

.futvia .chapter-subtitle {
  margin-top: var(--space-3);
  max-width: 30rem;
  font-size: clamp(1.4rem, 4.8vw, 3.8rem);
  line-height: 1.03;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.futvia-grid {
  gap: var(--space-8);
}

.futvia-copy p + p {
  margin-top: var(--space-5);
}

.role-impact-line {
  margin-bottom: var(--space-4);
}

.role-word-stack {
  margin: 0 0 var(--space-6);
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.role-word-stack span {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 12vw, 5rem);
  line-height: 0.82;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

.stack-word-stack {
  margin: var(--space-4) 0 var(--space-5);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.stack-word-item strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 10vw, 4.2rem);
  line-height: 0.84;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

.stack-word-item small {
  display: block;
  margin-top: 0.2rem;
  font-size: var(--fs-0);
  color: var(--ink-soft);
  line-height: 1.35;
}

.futvia-cta-row {
  margin-top: var(--space-6);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  justify-content: start;
}

.futvia-cta-row .cta {
  letter-spacing: 0.09em;
  word-spacing: 0.34em;
}

.futvia-cta-row .cta-futvia {
  letter-spacing: 0.06em;
  word-spacing: 0.5em;
}

.reflection-cta-row {
  margin-top: var(--space-6);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  justify-content: start;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.35rem;
  border: var(--rule-w) solid var(--ink);
  padding: 0.95rem 1rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  word-spacing: 0.18em;
  font-size: 0.78rem;
  font-weight: 500;
  box-shadow: 3px 3px 0 var(--ink);
  transform: translate(0, 0);
  transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.cta-primary {
  background: var(--signal);
  color: #fff;
  border-color: var(--signal);
}

.cta-primary:hover,
.cta-primary:focus-visible {
  background: #7f141d;
  border-color: #7f141d;
}

.cta-secondary {
  background: #fff;
  color: var(--ink);
}

.cta-secondary:hover,
.cta-secondary:focus-visible {
  background: var(--surface);
}

.cta:hover,
.cta:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--ink);
}

.cta:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 var(--ink);
}

.meta-block {
  border: var(--rule-w) solid var(--ink);
  background: var(--surface);
  padding: var(--space-5);
}

.meta-block h2 {
  font-size: var(--fs-4);
  margin-bottom: var(--space-4);
}

.meta-block ul,
.chapter ul,
.chapter ol {
  margin: 0;
  padding-left: 1.35rem;
}

.chapter ul,
.chapter ol {
  margin-top: 0;
  margin-bottom: 0;
  line-height: 1.62;
}

.chapter li + li {
  margin-top: 0.45rem;
}

.chapter article h3 {
  margin-top: var(--space-6);
}

.chapter article > h3:first-child {
  margin-top: 0;
}

.meta-note,
.callout {
  margin-top: var(--space-4);
  border-left: 2px solid var(--signal);
  padding-left: var(--space-4);
  color: var(--ink);
}

.thesis-layout {
  display: grid;
  gap: var(--space-5);
  padding: 0;
}

.thesis-layout blockquote {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-4);
  line-height: 0.98;
  color: var(--ink);
  text-transform: uppercase;
}

.surface-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-top: var(--space-5);
}

.mvp-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.surface-grid > article {
  border: var(--rule-w) solid var(--ink);
  padding: var(--space-4);
  background: var(--surface);
}

.surfaces .surface-grid > article {
  border: 0;
  padding: 0;
  background: transparent;
}

.surfaces .surface-grid + p {
  margin-top: var(--space-7);
}

.logic-strip {
  list-style: none;
  padding: 0;
  margin: var(--space-5) 0;
  border: var(--rule-w) solid var(--ink);
}

.logic-strip li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--space-4);
  padding: var(--space-4);
  border-top: var(--rule-w) solid var(--rule);
}

.logic-strip li:first-child {
  border-top: 0;
}

.logic-strip span {
  font-family: var(--font-display);
  color: var(--signal);
  font-size: var(--fs-3);
  line-height: 1;
}

.stack-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-5);
}

.stack-grid article {
  border: var(--rule-w) solid var(--ink);
  background: var(--surface);
  padding: var(--space-4);
}

.capability-grid {
  margin-top: var(--space-5);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.capability-grid > div {
  border: var(--rule-w) solid var(--ink);
  background: var(--surface);
  padding: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--fs-0);
  font-weight: 700;
  color: var(--ink);
}

.scope-diagram {
  border: var(--rule-w) solid var(--ink);
  background: var(--surface);
  padding: var(--space-4);
}

.scope-diagram ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-2);
}

.scope-diagram li {
  display: grid;
  grid-template-columns: 1.8rem 1fr;
  gap: var(--space-3);
  border: var(--rule-w) solid var(--rule);
  background: #fff;
  padding: var(--space-3);
  color: var(--ink);
  text-transform: uppercase;
  font-size: var(--fs-0);
  font-weight: 700;
  letter-spacing: 0.07em;
}

.scope-diagram span {
  font-family: var(--font-display);
  font-size: var(--fs-3);
  line-height: 1;
  color: var(--signal);
}

.evidence-grid {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-5);
}

.evidence {
  margin-top: var(--space-6);
  border: var(--rule-w) solid var(--ink);
  background: var(--surface);
  padding: var(--space-4);
}

.evidence-head {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.evidence-label {
  font-size: var(--fs-00);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--ink);
}

.evidence-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.evidence-controls button {
  border: var(--rule-w) solid var(--ink);
  background: #fff;
  color: var(--ink);
  font-size: var(--fs-00);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
}

.evidence-controls button[data-action="hide"] {
  display: none;
}

.evidence[data-evidence-state="expanded"] .evidence-controls button[data-action="hide"] {
  display: inline-block;
}

.evidence[data-evidence-state="expanded"] .evidence-controls button[data-action="expand"] {
  display: none;
}

.evidence-frame {
  position: relative;
  height: 12rem;
  overflow: hidden;
  border: var(--rule-w) solid var(--ink);
  background: #fff;
  transition: height var(--dur-med) var(--ease);
}

.evidence[data-evidence-state="expanded"] .evidence-frame {
  height: 26rem;
}

.evidence-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.annotations {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.annotation {
  position: absolute;
  width: 10.5rem;
  font-size: var(--fs-00);
  color: var(--ink);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
}

.evidence[data-evidence-state="expanded"] .annotation {
  opacity: 1;
}

.annotation-line {
  display: block;
  width: 2.2rem;
  border-top: var(--rule-w) solid var(--ink);
  margin-bottom: var(--space-2);
}

.annotation-tag {
  display: inline-block;
  background: #fff;
  border: var(--rule-w) solid var(--ink);
  padding: 0.1rem 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.annotation p {
  margin: 0;
  color: var(--ink);
  line-height: 1.4;
  background: #fff;
  border: var(--rule-w) solid var(--ink);
  padding: 0.3rem 0.45rem;
}

.evidence-caption {
  display: none !important;
}

.evidence-caption:empty {
  display: none;
}

.evidence--complete .evidence-frame {
  border: 0;
  height: auto;
  max-height: none;
  overflow: visible;
  background: transparent;
  cursor: zoom-in;
}

.evidence--complete .evidence-frame img {
  height: auto;
  max-height: 21rem;
  object-fit: contain;
  background: #fff;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.08);
}

.evidence--complete .annotations {
  display: none;
}

.evidence--complete {
  border: 0;
  background: transparent;
  padding: 0;
}

.evidence--complete .evidence-frame:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 6px;
}

.futvia .evidence--complete {
  margin-top: var(--space-9);
}

@media (max-width: 767px) {
  .evidence--complete .evidence-frame {
    height: 16rem;
    overflow: hidden;
  }

  .evidence--complete .evidence-frame img {
    width: 100%;
    height: 100%;
    max-height: none;
    object-fit: cover;
    object-position: top center;
    background: transparent;
  }
}

.page-footer {
  border-top: var(--rule-w) solid var(--ink);
  margin-top: var(--space-10);
  padding: var(--space-5) 0;
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-size: var(--fs-0);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.screen-modal {
  border: var(--rule-w) solid var(--ink);
  background: var(--surface);
  color: var(--ink);
  width: min(95vw, 1200px);
  max-height: 92vh;
  padding: var(--space-4);
}

.screen-modal::backdrop {
  background: rgba(0, 0, 0, 0.65);
}

.modal-close {
  border: var(--rule-w) solid var(--ink);
  background: #fff;
  width: 2.2rem;
  height: 2.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: var(--fs-1);
  font-weight: 700;
  cursor: pointer;
}

#modal-image {
  width: 100%;
  max-height: 72vh;
  object-fit: contain;
  border: var(--rule-w) solid var(--ink);
  margin-top: var(--space-4);
  background: #fff;
}

#modal-caption {
  display: none;
}

.floating-top {
  position: fixed;
  right: var(--space-4);
  bottom: var(--space-4);
  z-index: 40;
  border: var(--rule-w) solid var(--ink);
  background: #fff;
  color: var(--ink);
  padding: 0.7rem 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  word-spacing: 0.16em;
  font-size: var(--fs-00);
  font-weight: 600;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  box-shadow: 3px 3px 0 var(--ink);
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.floating-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.floating-top:hover,
.floating-top:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--ink);
}

.floating-top:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 var(--ink);
}

@media (min-width: 768px) {
  :root {
    --fs-4: 2.6rem;
    --fs-5: 4rem;
    --fs-6: 5.2rem;
  }

  .case-main {
    padding: var(--space-6);
  }

  .top-quick-nav__inner {
    padding: var(--space-3) var(--space-6);
  }

  .floating-top {
    right: var(--space-6);
    bottom: var(--space-6);
  }

  .role-grid,
  .stage-grid,
  .context-grid,
  .mvp-grid,
  .research-band,
  .trust-grid,
  .validation-grid {
    grid-template-columns: 1fr 1fr;
  }

  .role-word-stack span {
    font-size: clamp(2.6rem, 6.5vw, 5.8rem);
  }

  .stack-word-item strong {
    font-size: clamp(2.2rem, 4.6vw, 4.8rem);
  }

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

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

  .evidence-grid-two {
    grid-template-columns: 1fr 1fr;
  }

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

  .evidence-frame {
    height: 14rem;
  }

  .evidence[data-evidence-state="expanded"] .evidence-frame {
    height: 30rem;
  }

  .futvia .chapter-head {
    margin-bottom: var(--space-9);
  }

  .futvia .chapter-head h1 {
    font-size: clamp(10rem, 22vw, 22rem);
  }

  .futvia .chapter-subtitle {
    font-size: clamp(1.6rem, 4vw, 4.2rem);
  }

  .futvia-grid {
    gap: var(--space-9);
  }

  .futvia-cta-row {
    grid-template-columns: auto auto;
    justify-content: start;
  }

  .futvia-cta-row .cta {
    min-width: 15rem;
  }

  .reflection-cta-row {
    grid-template-columns: auto auto;
    justify-content: start;
  }

  .reflection-cta-row .cta {
    min-width: 15rem;
  }

  .evidence--complete .evidence-frame img {
    max-height: 28rem;
  }
}

@media (min-width: 1024px) {
  :root {
    --fs-6: 6.3rem;
  }

  .page-shell {
    display: grid;
    grid-template-columns: var(--rail-w) 1fr;
    min-height: 100vh;
  }

  .top-quick-nav__inner {
    width: calc(100% - var(--rail-w));
    max-width: none;
    margin-left: var(--rail-w);
    overflow: hidden;
    justify-content: flex-start;
    gap: var(--space-4);
  }

  .top-quick-nav__inner a {
    flex: 0 0 auto;
  }

  .chapter-rail {
    display: block;
    border-right: var(--rule-w) solid var(--ink);
    padding: var(--space-6) var(--space-4);
    position: sticky;
    top: 0;
    height: 100vh;
    background: var(--bg);
  }

  .rail-brand {
    font-family: var(--font-display);
    font-size: var(--fs-3);
    line-height: 1;
    letter-spacing: 0.04em;
    margin-bottom: var(--space-3);
  }

  .chapter-rail .rail-brand {
    display: block;
    border: 0;
    padding: 0;
    margin-bottom: var(--space-3);
    font-family: var(--font-display);
    font-size: clamp(1.9rem, 2.5vw, 2.5rem);
    line-height: 0.95;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: var(--ink);
    font-weight: 700;
  }

.rail-doc {
  font-size: var(--fs-00);
  letter-spacing: 0.08em;
  text-transform: none;
  margin-bottom: var(--space-6);
  color: var(--ink);
  font-weight: 700;
}

  .chapter-rail nav {
    display: grid;
    gap: var(--space-2);
  }

  .chapter-rail a {
    border: var(--rule-w) solid transparent;
    padding: var(--space-2) var(--space-2);
    font-size: var(--fs-00);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--ink-soft);
  }

  .chapter-rail a.is-active {
    border-color: var(--ink);
    color: var(--ink);
    background: #fff;
  }

  .mobile-index {
    display: none;
  }

  .chapter {
    padding: var(--space-9) 0;
  }

  .mvp-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    column-gap: var(--space-8);
  }

  .mvp-layout .evidence {
    margin-top: 0;
  }
}

@media (min-width: 1280px) {
  :root {
    --fs-6: 7.1rem;
  }

  .chapter h1,
  .chapter h2 {
    max-width: 22ch;
  }

  .case-main {
    padding: var(--space-7);
  }
}