.usecase-intel {
  background:
    radial-gradient(circle at 12% 8%, rgba(99, 91, 255, 0.12), transparent 34%),
    var(--bg-soft);
}

.signal-grid,
.impact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.signal-card,
.impact-card,
.stakeholder-card,
.decision-step {
  border: 1px solid rgba(10, 37, 64, 0.08);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow);
}

.signal-card,
.impact-card,
.stakeholder-card {
  padding: 24px;
}

.signal-card span,
.impact-card span,
.stakeholder-card span {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.signal-card h3,
.impact-card h3,
.stakeholder-card h3,
.decision-step h3 {
  color: var(--primary-dark);
  font-size: 20px;
  line-height: 1.25;
}

.signal-card p,
.impact-card p,
.stakeholder-card p,
.decision-step p {
  margin-top: 10px;
  color: var(--muted);
  font-size: 14px;
}

.decision-flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.decision-step {
  position: relative;
  min-height: 220px;
  padding: 26px;
  overflow: hidden;
}

.decision-step strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 18px;
  border-radius: 50%;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.impact-card strong {
  display: block;
  color: var(--primary-dark);
  font-family: "Oswald", sans-serif;
  font-size: 38px;
  line-height: 1;
}

.stakeholder-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 24px;
  align-items: stretch;
}

.stakeholder-panel {
  padding: 36px;
  border-radius: var(--radius);
  color: #ffffff;
  background:
    radial-gradient(circle at 14% 0%, rgba(255, 255, 255, 0.24), transparent 34%),
    linear-gradient(135deg, var(--primary-dark), var(--primary));
  box-shadow: 0 34px 78px rgba(10, 37, 64, 0.18);
}

.stakeholder-panel h3 {
  color: #ffffff;
  font-size: 30px;
}

.stakeholder-panel p {
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.78);
}

.stakeholder-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

body.dark .usecase-intel {
  background: #0b1220;
}

body.dark .signal-card,
body.dark .impact-card,
body.dark .stakeholder-card,
body.dark .decision-step {
  border-color: rgba(255, 255, 255, 0.09);
  background: rgba(17, 24, 39, 0.86);
  box-shadow: 0 24px 54px rgba(0, 0, 0, 0.28);
}

body.dark .signal-card h3,
body.dark .impact-card h3,
body.dark .stakeholder-card h3,
body.dark .decision-step h3,
body.dark .impact-card strong {
  color: #ffffff;
}

@media (max-width: 1100px) {
  .signal-grid,
  .impact-grid,
  .decision-flow,
  .stakeholder-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .stakeholder-list {
    grid-template-columns: 1fr;
  }

  .signal-card,
  .impact-card,
  .stakeholder-card,
  .decision-step,
  .stakeholder-panel {
    padding: 22px;
  }
}

/* Architecture Grid - Premium Style */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 32px;
}

.arch-layer {
  position: relative;
  padding: 28px;
  border-radius: 16px;
  background: linear-gradient(145deg, rgba(100, 80, 200, 0.08) 0%, rgba(100, 80, 200, 0.02) 100%);
  border: 1px solid rgba(99, 91, 255, 0.15);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.arch-layer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 16px 16px 0 0;
  opacity: 0.8;
}

.arch-layer:hover {
  transform: translateY(-8px);
  border-color: rgba(99, 91, 255, 0.3);
  box-shadow: 
    0 12px 24px rgba(99, 91, 255, 0.15),
    0 0 40px rgba(99, 91, 255, 0.1);
}

.arch-layer h3 {
  color: var(--primary-dark);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(99, 91, 255, 0.1);
  letter-spacing: 0.5px;
}

.arch-layer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.arch-layer li {
  position: relative;
  padding: 10px 0 10px 22px;
  color: #555;
  font-size: 13px;
  line-height: 1.5;
  border-bottom: 1px solid rgba(99, 91, 255, 0.05);
}

.arch-layer li:last-child {
  border-bottom: none;
}

.arch-layer li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-size: 10px;
  top: 12px;
  font-weight: 600;
}

.arch-layer li strong {
  color: var(--primary-dark);
  font-weight: 600;
}

/* Layer-specific accent colors */
.arch-layer:nth-child(1)::before {
  background: linear-gradient(90deg, #00d4aa, #00b894);
}

.arch-layer:nth-child(2)::before {
  background: linear-gradient(90deg, #6c5ce7, #a29bfe);
}

.arch-layer:nth-child(3)::before {
  background: linear-gradient(90deg, #fd79a8, #e84393);
}

.arch-layer:nth-child(4)::before {
  background: linear-gradient(90deg, #fdcb6e, #f39c12);
}

/* Dark mode styles for architecture grid */
body.dark .arch-layer {
  background: linear-gradient(145deg, rgba(99, 91, 255, 0.15) 0%, rgba(99, 91, 255, 0.05) 100%);
  border-color: rgba(255, 255, 255, 0.12);
}

body.dark .arch-layer:hover {
  border-color: rgba(99, 91, 255, 0.4);
  box-shadow: 
    0 20px 40px rgba(0, 0, 0, 0.3),
    0 0 60px rgba(99, 91, 255, 0.2);
}

body.dark .arch-layer h3 {
  color: #ffffff;
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

body.dark .arch-layer li {
  color: rgba(255, 255, 255, 0.75);
  border-bottom-color: rgba(255, 255, 255, 0.05);
}

body.dark .arch-layer li::before {
  color: var(--accent);
}

body.dark .arch-layer li strong {
  color: #ffffff;
}

@media (max-width: 1024px) {
  .arch-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .arch-grid {
    grid-template-columns: 1fr;
  }

  .arch-layer {
    padding: 22px;
  }
}

/* ============================================
   PREMIUM SUBMENU STYLING FOR USECASE PAGES
   ============================================ */
.nav-item {
  position: relative;
}

.nav-item.has-submenu {
  position: relative;
}

.nav-parent {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.dropdown-icon {
  font-size: 10px;
  transition: transform 0.3s ease;
  display: inline-block;
}

.nav-item.has-submenu:hover .dropdown-icon {
  transform: rotate(180deg);
}

.submenu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: white;
  border: 1px solid rgba(10, 37, 64, 0.1);
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 8px 0;
  margin-top: 8px;
  z-index: 1000;
}

.nav-item.has-submenu:hover .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.submenu a {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  color: #4b5563;
  text-decoration: none;
  transition: all 0.2s ease;
  border-left: 3px solid transparent;
}

.submenu a:first-child {
  border-radius: 8px 8px 0 0;
}

.submenu a:last-child {
  border-radius: 0 0 8px 8px;
}

.submenu a:hover {
  background: #f9fafb;
  color: var(--primary);
  border-left-color: var(--primary);
  padding-left: 20px;
}

body.dark .submenu {
  background: #1a1f2e;
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

body.dark .submenu a {
  color: rgba(255, 255, 255, 0.75);
}

body.dark .submenu a:hover {
  background: rgba(99, 91, 255, 0.1);
  color: #ffffff;
  border-left-color: var(--accent);
}

@media(max-width: 768px) {
  .submenu {
    position: static;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transform: none;
    border: none;
    box-shadow: none;
    background: transparent;
    padding: 0;
    margin: 0;
    transition: all 0.3s ease;
  }

  .nav-item.has-submenu.active .submenu {
    opacity: 1;
    visibility: visible;
    max-height: 500px;
    padding: 8px 0;
    background: #f9fafb;
    border-top: 1px solid #e5e7eb;
    border-bottom: 1px solid #e5e7eb;
    margin: 8px 0;
  }

  body.dark .nav-item.has-submenu.active .submenu {
    background: #111827;
    border-color: #2d3748;
  }

  .submenu a {
    padding-left: 32px;
  }

  .submenu a:hover {
    padding-left: 36px;
  }

  .dropdown-icon {
    font-size: 9px;
  }

  .nav-item.has-submenu.active .dropdown-icon {
    transform: rotate(180deg);
  }
}