/* Case studies extend the portfolio's shared layout and theme tokens. */
.study-skip:focus-visible {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  width: auto;
  height: auto;
  padding: 0.5rem 0.75rem;
  clip: auto;
  background: var(--bg);
}

.study-back {
  min-width: 78px;
  height: 36px;
  padding: 0 9px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.study-back:hover {
  background: var(--card-hover);
  border-color: var(--border-strong);
  transform: translateX(-2px);
}

.study-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 1.5rem 0;
  font-size: 12.5px;
  color: var(--fg-subtle);
}

.study-breadcrumb a:hover,
.study-contents a:hover {
  color: var(--accent);
}

.study-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}

.study-hero h1 {
  margin: 0.5rem 0 0.75rem;
  font-size: clamp(32px, 5vw, 46px);
  line-height: 1.15;
  letter-spacing: -0.045em;
  color: var(--fg-heading);
}

.study-lead {
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.65;
  color: var(--fg-muted);
}

.study-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 1.25rem;
}

.study-actions:empty {
  display: none;
}

.study-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem 2rem;
  margin-top: 2rem;
  padding: 1.35rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-bg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 6px 16px -4px rgba(0, 0, 0, 0.03);
}

.study-facts dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 4px;
}

.study-facts dd {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--fg);
  font-weight: 500;
}

.study-contents {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  padding-top: 1.25rem;
  color: var(--fg-muted);
  font-size: 12.5px;
}

.study-screenshot {
  margin-top: 2rem;
}

.study-screenshot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
}

.study-screenshot figcaption {
  margin-top: 0.75rem;
  font-size: 12.5px;
  color: var(--fg-subtle);
  text-align: center;
  line-height: 1.5;
}

.study-section {
  margin-top: 3rem;
}

.study-section-body {
  padding-top: 1.25rem;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fg-muted);
}

.study-section-body > p + p {
  margin-top: 1rem;
}

.study-list {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

.study-list li + li {
  margin-top: 0.65rem;
}

.study-list li::marker,
.study-flow li::marker {
  color: var(--accent);
}

.study-flow {
  padding-left: 1.6rem;
}

.study-flow li {
  padding: 0.85rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.study-flow li:hover {
  transform: translateY(-1.5px);
  border-color: var(--border-strong);
}

.study-flow li + li {
  margin-top: 0.85rem;
}

.study-flow li::marker {
  font-family: var(--font-mono);
  font-size: 12px;
}

.study-section h3 {
  margin-bottom: 0.35rem;
  font-size: 16px;
  line-height: 1.5;
  font-weight: 650;
  letter-spacing: -0.015em;
  color: var(--fg-heading);
}

.study-decision {
  padding: 1.25rem 1.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.study-decision + .study-decision {
  margin-top: 1.25rem;
}

.study-section code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--badge-bg);
  border: 1px solid var(--border-subtle);
  overflow-wrap: anywhere;
  color: var(--accent);
}

.study-reference {
  margin-top: 0.65rem;
  font-size: 12.5px;
}

.study-reference a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.study-note {
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  border-left: 2px solid var(--accent);
  background: var(--card-bg);
  border-radius: 0 8px 8px 0;
  border-top: 1px solid var(--border);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  color: var(--fg);
}

.study-sources {
  list-style: none;
  margin-top: 1rem;
}

.study-sources a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  margin-bottom: 0.5rem;
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.study-sources a:hover {
  transform: translateY(-1.5px);
  border-color: var(--accent);
  background: var(--card-hover);
  color: var(--accent);
}

.study-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.study-next a {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 14px;
  padding: 1.25rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.study-next a:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: var(--card-hover);
  box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.1);
}

.study-next a:hover > span:last-child {
  color: var(--accent);
}

.study-next a:last-child {
  text-align: right;
}

@media (max-width: 479px) {
  .study-back {
    min-width: 36px;
  }

  .study-back-label {
    display: none;
  }

  .study-facts {
    grid-template-columns: 1fr;
    gap: 0.85rem;
    padding: 1rem;
  }

  .study-next {
    grid-template-columns: 1fr;
  }

  .study-next a:last-child {
    text-align: left;
  }
}