/* Bilingual switch: only the active locale's copy stays in the DOM flow, which
   also keeps the hidden language out of the accessibility tree. */
:root[data-locale="pt"] [data-lang="en"],
:root[data-locale="en"] [data-lang="pt"] {
  display: none;
}

.lang-switch {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}

.lang-switch button {
  padding: 0.35rem 0.75rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background-color 240ms var(--ease), color 240ms var(--ease);
}

.lang-switch button[aria-pressed="true"] {
  background: var(--grad);
  color: var(--accent-ink);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-soft);
  font-size: 0.88rem;
  font-weight: 500;
  transition: color 240ms var(--ease), gap 240ms var(--ease);
}

.back-link svg {
  width: 1rem;
  height: 1rem;
  transition: transform 240ms var(--ease);
}

.back-link:hover {
  color: var(--accent);
  gap: 0.7rem;
}

.back-link:hover svg {
  transform: translateX(-2px);
}

/* ------------------------------------------------------------------ hero -- */

.case-hero {
  padding-top: clamp(7rem, 13vw, 9.5rem);
  padding-bottom: clamp(2.5rem, 5vw, 4rem);
}

.case-title {
  max-width: 20ch;
  font-size: clamp(2.5rem, 6vw, 4.4rem);
  letter-spacing: -0.045em;
  line-height: 1;
}

.case-sub {
  max-width: 48rem;
  margin-top: 1.4rem;
  color: var(--text-soft);
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
}

.case-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 1.5rem;
  margin-top: 2.6rem;
  padding-top: 1.8rem;
  border-top: 1px solid var(--border);
}

.case-meta dt {
  margin-bottom: 0.3rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.case-meta dd {
  font-size: 0.92rem;
  font-weight: 500;
  line-height: 1.45;
}

.case-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 2.2rem;
}

/* --------------------------------------------------------------- content -- */

.case-section {
  padding-block: clamp(3rem, 6vw, 4.5rem);
}

.case-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.35fr) minmax(0, 0.65fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.case-layout > h2 {
  position: sticky;
  top: 6.5rem;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

.case-body {
  display: grid;
  gap: 1.15rem;
  color: var(--text-soft);
  font-size: 1.04rem;
}

.case-body > [data-lang] {
  display: grid;
  gap: 1.15rem;
}

.case-body strong {
  color: var(--text);
  font-weight: 600;
}

.case-body ul {
  display: grid;
  gap: 0.7rem;
  margin: 0.2rem 0 0;
  padding: 0;
  list-style: none;
}

.case-body li {
  position: relative;
  padding-left: 1.6rem;
}

.case-body li::before {
  position: absolute;
  top: 0.62em;
  left: 0.2rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.callout {
  padding: 1.3rem 1.5rem;
  border-left: 2px solid var(--accent);
  border-radius: var(--r-sm);
  background: var(--grad-soft);
  color: var(--text);
  font-size: 0.98rem;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 0.8rem;
  margin-top: 0.4rem;
}

.spec {
  padding: 1.1rem 1.2rem;
  border-radius: var(--r-md);
}

.spec h3 {
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}

.spec p {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.5;
}

/* ----------------------------------------------------------------- chart -- */

.chart-card {
  padding: clamp(1.4rem, 3vw, 2.2rem);
}

.chart-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.6rem;
}

.chart-head h3 {
  font-size: 1.15rem;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-soft);
  font-size: 0.82rem;
}

.legend-swatch {
  width: 0.85rem;
  height: 0.85rem;
  flex: none;
  border-radius: 3px;
}

/* Okabe-Ito pairing: orange vs. sky blue stays distinguishable under every
   common form of color vision deficiency, and each bar is labelled anyway. */
.legend-before {
  background: var(--c-before);
}

.legend-after {
  background: var(--c-after);
  background-image: repeating-linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.55) 0 2px,
    transparent 2px 5px
  );
}

:root {
  --c-before: #e69f00;
  --c-after: #56b4e9;
}

:root[data-theme="light"] {
  --c-before: #b45309;
  --c-after: #0072b2;
}

.chart-svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

/* The chart scales with its viewBox, so at phone widths the baked-in SVG font
   sizes render around 7px. Scale them back up to stay readable. */
@media (max-width: 680px) {
  .chart-svg .c-value {
    font-size: 26px;
  }

  .chart-svg .c-axis {
    font-size: 22px;
  }

  .chart-svg .c-cat {
    font-size: 27px;
  }
}

.chart-note {
  margin-top: 1.4rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.84rem;
}

.delta-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 0.8rem;
  margin-top: 1.4rem;
}

.delta {
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface-2);
}

.delta b {
  display: block;
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.delta span {
  color: var(--text-dim);
  font-size: 0.82rem;
}

/* ------------------------------------------------------------------- cta -- */

.case-cta {
  display: grid;
  gap: 1.4rem;
  justify-items: center;
  padding: clamp(2.2rem, 5vw, 3.6rem);
  text-align: center;
}

.case-cta h2 {
  max-width: 22ch;
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
}

.case-cta p {
  max-width: 44ch;
  color: var(--text-soft);
}

@media (max-width: 860px) {
  .case-layout {
    grid-template-columns: 1fr;
  }

  .case-layout > h2 {
    position: static;
  }
}