:root {
  --demo-shell: min(1240px, calc(100vw - 48px));
}

.demo-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--nav-h) + 52px) 24px 28px;
}

.demo-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(
      circle at 18% 24%,
      rgba(88, 215, 255, 0.18),
      transparent 30%
    ),
    radial-gradient(
      circle at 84% 20%,
      rgba(181, 156, 255, 0.16),
      transparent 28%
    ),
    radial-gradient(
      circle at 50% 82%,
      rgba(123, 240, 190, 0.08),
      transparent 34%
    );
  pointer-events: none;
}

.demo-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(151, 190, 181, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(151, 190, 181, 0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent);
  pointer-events: none;
}

.demo-hero-inner {
  position: relative;
  z-index: 1;
  width: var(--demo-shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 24px;
  align-items: stretch;
}

.demo-hero-copy,
.demo-summary-panel,
.demo-context-card,
.demo-workspace {
  backdrop-filter: blur(18px);
}

.demo-hero-copy {
  background: linear-gradient(
    180deg,
    rgba(15, 24, 31, 0.88),
    rgba(12, 19, 26, 0.72)
  );
  border: 1px solid rgba(151, 190, 181, 0.14);
  border-radius: 28px;
  padding: 34px;
  box-shadow: var(--shadow-lg);
}

.demo-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid rgba(88, 215, 255, 0.2);
  background: rgba(88, 215, 255, 0.08);
  color: var(--teal);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.demo-kicker .live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
  flex-shrink: 0;
  animation: livePulse 2.4s ease infinite;
}

@keyframes livePulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.demo-title {
  font-size: clamp(2.3rem, 5vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  margin: 18px 0 18px;
}

.demo-sub {
  max-width: 60ch;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.82;
}

.demo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.demo-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.demo-chip {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(151, 190, 181, 0.14);
  background: rgba(17, 25, 34, 0.88);
  color: var(--muted);
  font-size: 0.78rem;
}

.demo-summary-panel {
  background: linear-gradient(
    180deg,
    rgba(12, 20, 28, 0.96),
    rgba(11, 18, 24, 0.78)
  );
  border: 1px solid rgba(151, 190, 181, 0.14);
  border-radius: 28px;
  padding: 26px;
  box-shadow: var(--shadow);
}

.demo-summary-head,
.demo-side-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim);
}

.demo-summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.demo-metric {
  min-height: 118px;
  padding: 14px;
  border-radius: 18px;
  background: rgba(20, 31, 40, 0.9);
  border: 1px solid rgba(151, 190, 181, 0.1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
}

.demo-metric-label {
  font-size: 0.72rem;
  color: var(--dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.demo-metric strong {
  font-size: 0.94rem;
  line-height: 1.5;
}

.demo-summary-note {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(88, 215, 255, 0.06);
  border: 1px solid rgba(88, 215, 255, 0.14);
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.75;
}

.demo-main {
  width: var(--demo-shell);
  margin: 0 auto;
  padding: 18px 0 72px;
}

.demo-main section {
  max-width: none;
  margin: 0;
  padding: 0;
}

.demo-context-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(280px, 0.82fr);
  gap: 24px;
}

.demo-context-card {
  background: rgba(15, 24, 31, 0.76);
  border: 1px solid rgba(151, 190, 181, 0.12);
  border-radius: 24px;
  padding: 30px;
  box-shadow: var(--shadow);
}

.demo-context-card .section-sub {
  max-width: 66ch;
  margin-bottom: 0;
}

.demo-flow-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.demo-flow-card {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid rgba(151, 190, 181, 0.1);
  background: rgba(19, 29, 38, 0.88);
}

.demo-flow-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(88, 215, 255, 0.12);
  border: 1px solid rgba(88, 215, 255, 0.24);
  color: var(--teal);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
}

.demo-flow-card h3 {
  margin-top: 14px;
  font-size: 1rem;
}

.demo-flow-card p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.7;
}

.demo-side-list {
  list-style: none;
  margin-top: 18px;
  display: grid;
  gap: 12px;
}

.demo-side-list li {
  padding: 14px 14px 14px 42px;
  border-radius: 16px;
  background: rgba(19, 29, 38, 0.88);
  border: 1px solid rgba(151, 190, 181, 0.1);
  color: var(--muted);
  position: relative;
  line-height: 1.75;
}

.demo-side-list li::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 21px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--teal), var(--green));
  box-shadow: 0 0 0 6px rgba(88, 215, 255, 0.08);
}

.demo-workspace-heading {
  margin-top: 28px;
  padding: 0 4px;
}

.demo-workspace-heading .section-sub {
  margin-bottom: 0;
}

.demo-workspace {
  margin-top: 22px;
  padding: 28px;
  border-radius: 28px;
  background: linear-gradient(
    180deg,
    rgba(12, 19, 26, 0.94),
    rgba(12, 18, 24, 0.88)
  );
  border: 1px solid rgba(151, 190, 181, 0.12);
  box-shadow: var(--shadow-lg);
}

.demo-results-column {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

@media (max-width: 1080px) {
  .demo-hero-inner,
  .demo-context-grid {
    grid-template-columns: 1fr;
  }

  .demo-flow-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  :root {
    --demo-shell: calc(100vw - 28px);
  }

  .demo-hero {
    padding: calc(var(--nav-h) + 28px) 0 18px;
  }

  .demo-hero-copy,
  .demo-summary-panel,
  .demo-context-card,
  .demo-workspace {
    border-radius: 22px;
  }

  .demo-hero-copy,
  .demo-summary-panel,
  .demo-context-card,
  .demo-workspace {
    padding: 22px;
  }

  .demo-title {
    font-size: clamp(2rem, 12vw, 3rem);
  }

  .demo-summary-grid {
    grid-template-columns: 1fr;
  }

  .demo-actions {
    flex-direction: column;
  }

  .demo-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* ── Polish: hover, focus, micro-interactions ────────────────────────────── */
.demo-metric {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: default;
}
.demo-metric:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}
.demo-metric:hover .demo-metric-val {
  text-shadow: 0 0 16px rgba(88, 215, 255, 0.35);
}

.demo-context-card {
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.demo-context-card:hover {
  border-color: rgba(88, 215, 255, 0.2);
}

.demo-flow-card {
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.demo-flow-card:hover {
  border-color: rgba(123, 240, 190, 0.2);
  transform: translateY(-2px);
}

.demo-summary-card {
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.demo-summary-card:hover {
  border-color: rgba(88, 215, 255, 0.15);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

/* ── PPI network widget ──────────────────────────────────────────── */
.ppi-wrap {
  margin-top: 56px;
  padding: 32px 32px 28px;
  background: rgba(15, 24, 31, 0.76);
  border: 1px solid rgba(151, 190, 181, 0.12);
  border-radius: 24px;
}
.ppi-wrap .section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #7dd3fc;
  margin-bottom: 8px;
}
.ppi-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: #e9f0ec;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.ppi-sub {
  color: #a8b0c2;
  line-height: 1.75;
  font-size: 0.92rem;
  max-width: 680px;
  margin-bottom: 22px;
}
.ppi-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(260px, 1fr);
  gap: 18px;
  align-items: stretch;
}
@media (max-width: 860px) {
  .ppi-layout { grid-template-columns: 1fr; }
}
.ppi-graph-wrap {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ppi-graph {
  height: 460px;
  width: 100%;
  border: 1px solid rgba(125, 211, 252, 0.18);
  border-radius: 12px;
  background: rgba(10, 16, 22, 0.6);
}
.ppi-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.74rem;
  color: #a8b0c2;
}
.ppi-legend i {
  display: inline-block;
  margin-right: 6px;
  vertical-align: middle;
}
.ppi-legend .lg-node {
  width: 12px; height: 12px; border-radius: 50%;
  background: #58d7ff;
  border: 2px solid rgba(88, 215, 255, 0.35);
}
.ppi-legend .lg-edge {
  width: 18px; height: 2px;
  background: rgba(88, 215, 255, 0.5);
}
.ppi-hint { margin-left: auto; color: #6b7488; }
.ppi-side {
  padding: 18px;
  background: rgba(10, 16, 22, 0.6);
  border: 1px solid rgba(151, 190, 181, 0.1);
  border-radius: 12px;
  min-height: 460px;
  display: flex;
  flex-direction: column;
}
.ppi-side-head {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #6b7488;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(151, 190, 181, 0.1);
  margin-bottom: 14px;
}
.ppi-side-body { flex: 1; }
.ppi-placeholder {
  color: #6b7488;
  font-size: 0.86rem;
  line-height: 1.7;
  margin: 0;
}
.ppi-sym {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.4rem;
  font-weight: 700;
  color: #7dd3fc;
  margin-bottom: 2px;
}
.ppi-en {
  font-size: 0.82rem;
  color: #e9f0ec;
  margin-bottom: 10px;
}
.ppi-role {
  font-size: 0.82rem;
  font-family: 'JetBrains Mono', monospace;
  color: #7bf0be;
  padding: 4px 10px;
  background: rgba(123, 240, 190, 0.08);
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 12px;
}
.ppi-note {
  font-size: 0.86rem;
  color: #a8b0c2;
  line-height: 1.75;
  margin: 0;
}
.ppi-usage {
  margin-top: 22px;
  padding: 16px 20px;
  background: rgba(125, 211, 252, 0.06);
  border-left: 2px solid rgba(125, 211, 252, 0.35);
  border-radius: 4px;
  font-size: 0.86rem;
  color: #a8b0c2;
  line-height: 1.8;
}
.ppi-usage strong {
  color: #e9f0ec;
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
}
.ppi-usage ul {
  margin: 0;
  padding-left: 20px;
}

/* ── Enhanced PPI section ── */
.ppi-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  max-width: var(--demo-shell);
  margin: 0 auto 14px;
  padding: 0 24px;
}
.ppi-tab {
  padding: 7px 16px;
  border-radius: 20px;
  border: 1px solid rgba(88,215,255,0.25);
  background: rgba(88,215,255,0.05);
  color: var(--muted);
  font-size: .8rem;
  cursor: pointer;
  transition: all .2s;
}
.ppi-tab:hover { border-color: rgba(88,215,255,0.5); color: var(--fg); }
.ppi-tab.active { background: rgba(88,215,255,0.15); border-color: rgba(88,215,255,0.6); color: #58d7ff; font-weight: 600; }
.ppi-toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  max-width: var(--demo-shell);
  margin: 0 auto 12px;
  padding: 0 24px;
}
.ppi-search-input {
  flex: 1;
  min-width: 160px;
  padding: 7px 12px;
  background: var(--surface);
  border: 1px solid rgba(88,215,255,0.2);
  border-radius: 8px;
  color: var(--fg);
  font-size: .82rem;
  outline: none;
}
.ppi-search-input:focus { border-color: rgba(88,215,255,0.5); }
.ppi-select {
  padding: 7px 10px;
  background: var(--surface);
  border: 1px solid rgba(88,215,255,0.2);
  border-radius: 8px;
  color: var(--muted);
  font-size: .8rem;
  cursor: pointer;
}
.ppi-btn {
  padding: 7px 14px;
  background: rgba(88,215,255,0.08);
  border: 1px solid rgba(88,215,255,0.25);
  border-radius: 8px;
  color: #58d7ff;
  font-size: .8rem;
  cursor: pointer;
  white-space: nowrap;
}
.ppi-btn:hover { background: rgba(88,215,255,0.15); }
.ppi-role-legend {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  max-width: var(--demo-shell);
  margin: 0 auto 14px;
  padding: 0 24px;
}
.ppi-role-filter {
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid color-mix(in srgb, var(--rc) 40%, transparent);
  background: color-mix(in srgb, var(--rc) 8%, transparent);
  color: var(--rc);
  font-size: .75rem;
  cursor: pointer;
  transition: all .2s;
}
.ppi-role-filter.active {
  background: color-mix(in srgb, var(--rc) 20%, transparent);
  border-color: var(--rc);
  font-weight: 600;
}
.ppi-stats-bar {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 8px 14px;
  background: rgba(88,215,255,0.05);
  border-top: 1px solid rgba(88,215,255,0.1);
  font-size: .78rem;
  color: var(--muted);
}
.ppi-stats-bar strong { color: var(--fg); }