/* ── Project hero ── */

.project-hero {
  padding: 3.5rem 0 2rem;
}

.back-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted-fg);
  margin-bottom: 1.5rem;
}

.back-link:hover {
  color: var(--primary);
  text-decoration: none;
}

.project-banner {
  margin: 0 0 2rem;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.project-banner img {
  width: 100%;
  height: auto;
  display: block;
}

.project-hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.95rem);
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.project-hero > .container > p {
  margin-top: 0.95rem;
  max-width: 68ch;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.project-hero-meta {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ── Confidentiality notice ── */

.confidentiality-note {
  margin-top: 2rem;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--card) 90%, var(--accent) 5%);
}

.confidentiality-title {
  margin: 0 0 0.6rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
}

.confidentiality-note p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.confidentiality-note strong {
  color: var(--foreground);
}

/* ── Case study sections ── */

.case-section {
  padding: 3rem 0;
}

.case-section + .case-section {
  padding-top: 0;
}

/* ── Table of contents ── */

.toc {
  padding: 1.25rem 1.5rem;
}

.toc-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--secondary);
  margin: 0 0 0.75rem;
}

.toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.toc-list a {
  color: var(--muted-fg);
  font-size: 0.9rem;
  font-weight: 500;
}

.toc-list a:hover {
  color: var(--primary);
  text-decoration: none;
}

/* ── Content grids ── */

.case-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.case-grid h3 {
  margin-top: 0;
  margin-bottom: 0.7rem;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.case-grid p,
.case-grid ul {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.case-grid ul {
  padding-left: 1.15rem;
  display: grid;
  gap: 0.4rem;
}

.case-grid code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  color: var(--secondary);
  background: var(--muted);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

/* ── Flow blocks ── */

.flow-block {
  margin-bottom: 2.5rem;
}

.flow-block:last-child {
  margin-bottom: 0;
}

.flow-block h3 {
  margin: 0 0 0.6rem;
  font-size: 1.1rem;
}

.flow-block > p {
  margin: 0 0 1.25rem;
  color: var(--text-muted);
  max-width: 68ch;
}

.flow-block code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--secondary);
  background: var(--muted);
  padding: 0.12em 0.4em;
  border-radius: 4px;
}

/* ── Tables ── */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table th,
.data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--muted);
}

.data-table td {
  color: var(--text-muted);
}

.data-table td:first-child {
  color: var(--foreground);
  font-weight: 500;
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table tbody tr:hover td {
  background: color-mix(in srgb, var(--muted) 50%, transparent);
}

/* ── Diagrams ── */

.diagram-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--card) 95%, var(--primary) 3%);
  padding: 1.5rem;
}

.mermaid {
  display: flex;
  justify-content: center;
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
}

/* ── Case nav ── */

.case-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* ── Responsive ── */

@media (max-width: 900px) {
  .case-grid {
    grid-template-columns: 1fr;
  }

  .toc-list {
    flex-direction: column;
    gap: 0.4rem;
  }
}

@media (max-width: 560px) {
  .case-nav {
    flex-direction: column;
  }

  .case-nav .button {
    width: 100%;
  }
}