body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 30px 30px;
  pointer-events: none;
  z-index: -1;
}
.page-hero {
  padding: 9rem 3rem 4rem;
  max-width: 1160px;
  margin: 0 auto;
}
.page-hero-back {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 2rem;
  transition: color var(--t);
}
.page-hero-back:hover { color: var(--dim); }

/* ── Stack cards ── */
.stacks {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 3rem 6rem;
}
.stack-card {
  background: var(--surf);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  border-left-width: 3px;
}
.stack-card:hover {
  border-color: rgba(255,255,255,0.1);
  box-shadow: 0 20px 50px rgba(0,0,0,0.35);
}

/* ── Couleurs par stack (cohérence avec les apps) ── */
.stack-hydro {
  border-left-color: var(--blue);
}
.stack-hydro:hover {
  border-color: var(--blue-bd);
  box-shadow: 0 20px 50px rgba(69,128,255,0.18);
}
.stack-hydro .stack-cta:hover        { color: var(--blue); border-color: var(--blue-bd); }
.stack-hydro.open .stack-toggle      { color: var(--blue); }
.stack-hydro .stack-toggle:hover     { color: var(--blue); }
.stack-hydro .pf-tag.accent          { color: var(--blue); border-color: var(--blue-bd); background: var(--blue-bg); }

.stack-urban {
  border-left-color: var(--accent);
}
.stack-urban:hover {
  border-color: var(--accent-bd);
  box-shadow: 0 20px 50px rgba(0,212,180,0.15);
}
.stack-urban .stack-cta:hover        { color: var(--accent); border-color: var(--accent-bd); }
.stack-urban.open .stack-toggle      { color: var(--accent); }
.stack-urban .stack-toggle:hover     { color: var(--accent); }

.stack-env {
  border-left-color: var(--green);
}
.stack-env:hover {
  border-color: var(--green-bd);
  box-shadow: 0 20px 50px rgba(34,197,94,0.15);
}
.stack-env .stack-cta:hover          { color: var(--green); border-color: var(--green-bd); }
.stack-env.open .stack-toggle        { color: var(--green); }
.stack-env .stack-toggle:hover       { color: var(--green); }

.stack-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 2rem;
  padding: 2.5rem 2.5rem 2rem;
}
.stack-num {
  font-family: var(--font-h);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}
.stack-num.teal   { color: var(--accent); }
.stack-num.blue   { color: var(--blue); }
.stack-num.violet { color: var(--violet); }
.stack-num.green  { color: var(--green); }

.stack-header h2 {
  font-size: 1.6rem;
  margin-bottom: 0.6rem;
}
.stack-header p {
  font-size: 0.88rem;
  color: var(--dim);
  line-height: 1.7;
  max-width: 560px;
}
.stack-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.stack-badge.online  { background: rgba(0,212,180,0.1); border: 1px solid var(--accent-bd); color: var(--accent); }
.stack-badge.dev     { background: rgba(245,158,11,0.1); border: 1px solid rgba(245,158,11,0.25); color: var(--amber); }
.stack-badge.planned { background: rgba(129,140,248,0.1); border: 1px solid var(--violet-bd); color: var(--violet); }
.stack-badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ── Modules ── */
.stack-modules {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}
.stack-module {
  padding: 1.75rem 2rem;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: background var(--t);
}
.stack-module:last-child,
.stack-module:nth-child(3n) { border-right: none; }
.stack-module:nth-last-child(-n+3) { border-bottom: none; }
.stack-module:hover { background: var(--surf2); }

.module-icon {
  width: 36px; height: 36px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.9rem;
  flex-shrink: 0;
}
.module-icon svg { width: 17px; height: 17px; }
.module-icon.teal   { background: var(--accent-bg); border: 1px solid var(--accent-bd); color: var(--accent); }
.module-icon.blue   { background: var(--blue-bg);   border: 1px solid var(--blue-bd);   color: var(--blue); }
.module-icon.violet { background: var(--violet-bg); border: 1px solid var(--violet-bd); color: var(--violet); }
.module-icon.amber  { background: var(--amber-bg);  border: 1px solid rgba(245,158,11,.25); color: var(--amber); }
.module-icon.green  { background: var(--green-bg);  border: 1px solid var(--green-bd);  color: var(--green); }

.stack-module h4 { margin-bottom: 0.4rem; font-size: 0.9rem; }
.stack-module p  { font-size: 0.8rem; color: var(--dim); line-height: 1.65; }

/* ── Tech footer ── */
.stack-tech {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.25rem 2.5rem;
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,0.15);
}
.stack-tech-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  flex-shrink: 0;
}
.stack-tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  flex: 1;
}

/* ── Accordéon toggle ── */
.stack-header {
  border-bottom: none;
}
.stack-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0.65rem 1rem;
  border: none;
  border-top: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color var(--t), background var(--t);
  font-family: var(--font-b);
}
.stack-toggle:hover {
  color: var(--dim);
  background: rgba(255,255,255,0.02);
}
.stack-card.open .stack-toggle {
  color: var(--accent);
  border-bottom: 1px solid var(--border);
}
.toggle-chevron {
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.stack-card.open .toggle-chevron {
  transform: rotate(180deg);
}

/* ── Corps accordéon ── */
.stack-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.36s ease;
}
.stack-card.open .stack-body {
  grid-template-rows: 1fr;
}
.stack-body-inner {
  overflow: hidden;
  min-height: 0;
}

/* ── Lien démo ── */
.stack-cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  border: 1px solid var(--border-2);
  color: var(--dim);
  transition: all var(--t);
  flex-shrink: 0;
}
.stack-cta:hover { border-color: var(--accent-bd); color: var(--accent); }

@media (max-width: 900px) {
  .page-hero { padding: 7rem 1.5rem 3rem; }
  .stacks { padding: 0 1.5rem 4rem; }
  .stack-header { grid-template-columns: 1fr; gap: 1rem; }
  .stack-modules { grid-template-columns: repeat(2, 1fr); }
  .stack-module:nth-child(3n)   { border-right: 1px solid var(--border); }
  .stack-module:nth-child(2n)   { border-right: none; }
  .stack-module:nth-last-child(-n+2) { border-bottom: none; }
  .stack-module:nth-last-child(-n+3) { border-bottom: 1px solid var(--border); }
}
@media (max-width: 600px) {
  .page-hero { padding: 6rem 1.25rem 2.5rem; }
  .stacks { padding: 0 1.25rem 3rem; }
  .stack-header { padding: 1.75rem 1.5rem 1.5rem; }
  .stack-modules { grid-template-columns: 1fr; }
  .stack-module { border-right: none !important; border-bottom: 1px solid var(--border) !important; }
  .stack-module:last-child { border-bottom: none !important; }
  .stack-tech { padding: 1rem 1.5rem; flex-wrap: wrap; }
}