/* Product Deep Dive Base Styles
   Shared, reusable styles for all deep-dive pages.
   Topic pages define these semantic variables in their own dd-{topic}.css:
   --dd-primary, --dd-secondary, --dd-accent, --dd-bg, --dd-border,
   --dd-text, --dd-muted, --dd-node-bg, --dd-node-border, --dd-connector
*/

:root {
  --dd-primary: #2563eb;
  --dd-secondary: #4f46e5;
  --dd-accent: #6366f1;
  --dd-bg: #eff6ff;
  --dd-border: #bfdbfe;
  --dd-text: #1e3a8a;
  --dd-muted: #475569;
  --dd-node-bg: #ffffff;
  --dd-node-border: #93c5fd;
  --dd-connector: #94a3b8;
  --dd-success-bg: #ecfdf5;
  --dd-success-border: #86efac;
  --dd-warning-bg: #fffbeb;
  --dd-warning-border: #fcd34d;
  --dd-danger-bg: #fef2f2;
  --dd-danger-border: #fca5a5;
  --dd-surface: #ffffff;
  --dd-surface-muted: #f8fafc;
  --dd-heading: #0f172a;
  --dd-body: #475569;
  --dd-faint: #94a3b8;
}

.dark {
  --dd-bg: #172554;
  --dd-border: #1d4ed8;
  --dd-text: #93c5fd;
  --dd-muted: #94a3b8;
  --dd-node-bg: #1e293b;
  --dd-node-border: #334155;
  --dd-connector: #475569;
  --dd-success-bg: #052e16;
  --dd-success-border: #166534;
  --dd-warning-bg: #451a03;
  --dd-warning-border: #92400e;
  --dd-danger-bg: #450a0a;
  --dd-danger-border: #7f1d1d;
  --dd-surface: var(--color-bg-secondary, #1e293b);
  --dd-surface-muted: #1e293b;
  --dd-heading: #f1f5f9;
  --dd-body: #94a3b8;
  --dd-faint: #64748b;
}

html {
  scroll-padding-top: 120px;
}

.dd-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 36px 0 56px;
}

.dd-section {
  padding-bottom: 8px;
}

.dd-divider {
  border: none;
  border-top: 1px solid var(--dd-node-border);
  margin: 44px 0;
}

.dd-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 999px;
  padding: 5px 12px;
  margin-bottom: 10px;
  background: var(--dd-bg);
  color: var(--dd-text);
  border: 1px solid var(--dd-border);
}

.dd-section-header {
  margin-bottom: 24px;
}

.dd-section-header h2 {
  font-size: 27px;
  font-weight: 700;
  color: var(--dd-heading);
}

.dd-section-header p {
  margin-top: 8px;
  font-size: 15px;
  max-width: 760px;
  color: var(--dd-body);
}

.dd-prose {
  color: var(--dd-body);
  font-size: 15px;
  line-height: 1.8;
  max-width: 760px;
}

.dd-prose p + p {
  margin-top: 10px;
}

.dd-prose strong {
  color: var(--dd-heading);
}

.dd-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.dd-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.dd-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.dd-card {
  background: var(--dd-surface);
  border: 2px solid var(--dd-node-border);
  border-radius: 14px;
  padding: 18px;
}

.dd-card h3,
.dd-card h4 {
  color: var(--dd-heading);
  font-weight: 700;
}

.dd-card p,
.dd-card li {
  color: var(--dd-body);
  font-size: 14px;
  line-height: 1.65;
}

.dd-callout {
  margin-top: 18px;
  border-radius: 12px;
  border: 2px solid var(--dd-border);
  background: var(--dd-bg);
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--dd-text);
}

.dd-callout strong {
  color: var(--dd-heading);
}

.dd-subnav {
  position: sticky;
  top: 64px;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding: 12px 24px;
  background: var(--color-bg-secondary, #f8fafc);
  border-bottom: 1px solid var(--color-border, #e2e8f0);
}

.dd-subnav-link {
  display: inline-block;
  white-space: nowrap;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary, #64748b);
  transition: all 0.2s ease;
}

.dd-subnav-link:hover {
  background: var(--color-bg-tertiary, #f1f5f9);
  color: var(--color-text-primary, #0f172a);
}

.dd-subnav-link.active {
  background: var(--dd-primary);
  color: #ffffff;
  font-weight: 600;
}

.dd-mode-visual {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.dd-mode-panel {
  border-radius: 14px;
  border: 2px solid var(--dd-node-border);
  background: var(--dd-surface);
  padding: 18px;
}

.dd-mode-panel h3 {
  color: var(--dd-heading);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.dd-mode-panel .dd-mode-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  color: var(--dd-text);
}

.dd-mode-panel p {
  color: var(--dd-body);
  font-size: 14px;
}

.dd-flow-wrap {
  border: 2px solid var(--dd-node-border);
  border-radius: 16px;
  background: linear-gradient(180deg, var(--dd-surface) 0%, var(--dd-surface-muted) 100%);
  padding: 20px;
  overflow: hidden;
}

.dd-flow-svg {
  width: 100%;
  height: auto;
  display: block;
}

.dd-flow-path {
  fill: none;
  stroke: var(--dd-connector);
  stroke-width: 2;
  stroke-dasharray: 8 5;
}

.dd-flow-node {
  fill: var(--dd-node-bg);
  stroke: var(--dd-node-border);
  stroke-width: 2;
}

.dd-flow-label {
  fill: var(--dd-heading);
  font-size: 12px;
  font-weight: 700;
  text-anchor: middle;
}

.dd-flow-dot {
  fill: var(--dd-accent);
  filter: drop-shadow(0 0 5px var(--dd-accent));
}

.dd-flow-node.pulse-1 { animation: nodeHighlight 8s ease-in-out infinite; animation-delay: 0s; }
.dd-flow-node.pulse-2 { animation: nodeHighlight 8s ease-in-out infinite; animation-delay: 1s; }
.dd-flow-node.pulse-3 { animation: nodeHighlight 8s ease-in-out infinite; animation-delay: 2s; }
.dd-flow-node.pulse-4 { animation: nodeHighlight 8s ease-in-out infinite; animation-delay: 3s; }
.dd-flow-node.pulse-5 { animation: nodeHighlight 8s ease-in-out infinite; animation-delay: 4s; }
.dd-flow-node.pulse-6 { animation: nodeHighlight 8s ease-in-out infinite; animation-delay: 5s; }
.dd-flow-node.pulse-7 { animation: nodeHighlight 8s ease-in-out infinite; animation-delay: 6s; }

@keyframes nodeHighlight {
  0%, 100% {
    filter: none;
    stroke-width: 2;
  }
  20% {
    filter: drop-shadow(0 0 8px color-mix(in srgb, var(--dd-accent) 60%, transparent));
    stroke-width: 2.5;
  }
  30% {
    filter: none;
    stroke-width: 2;
  }
}

.dd-flow-legend {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}

.dd-flow-legend-item {
  border-left: 3px solid var(--dd-primary);
  background: var(--dd-surface);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--dd-body);
}

.dd-flow-legend-item strong {
  color: var(--dd-heading);
}

.dd-comparison-wrap {
  overflow-x: auto;
  border: 2px solid var(--dd-node-border);
  border-radius: 14px;
  background: var(--dd-surface);
}

.dd-comparison-table {
  width: 100%;
  min-width: 980px;
  border-collapse: collapse;
}

.dd-comparison-table th,
.dd-comparison-table td {
  border-bottom: 1px solid var(--dd-node-border);
  border-right: 1px solid var(--dd-node-border);
  padding: 12px;
  vertical-align: top;
  font-size: 13px;
  line-height: 1.6;
}

.dd-comparison-table th:last-child,
.dd-comparison-table td:last-child {
  border-right: none;
}

.dd-comparison-table thead th {
  background: var(--dd-bg);
  color: var(--dd-text);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.dd-comparison-table tbody td:first-child {
  width: 180px;
  font-weight: 700;
  color: var(--dd-heading);
  background: var(--dd-surface-muted);
}

.dd-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.dd-metric-card {
  border-radius: 14px;
  border: 2px solid var(--dd-node-border);
  background: var(--dd-surface);
  padding: 16px;
}

.dd-metric-card h3 {
  font-size: 16px;
  margin-bottom: 10px;
  color: var(--dd-heading);
}

.dd-metric-row {
  font-size: 13px;
  line-height: 1.6;
  color: var(--dd-body);
}

.dd-metric-row strong {
  color: var(--dd-heading);
}

.dd-architecture {
  border: 2px solid var(--dd-node-border);
  border-radius: 14px;
  background: var(--dd-surface);
  padding: 18px;
}

.dd-arch-layer {
  border-radius: 10px;
  border: 1.5px solid var(--dd-border);
  background: var(--dd-bg);
  padding: 12px 14px;
  margin-bottom: 10px;
}

.dd-arch-layer:last-child {
  margin-bottom: 0;
}

.dd-arch-layer h4 {
  margin-bottom: 6px;
  font-size: 14px;
  color: var(--dd-text);
}

.dd-arch-layer p {
  font-size: 13px;
  color: var(--dd-body);
}

.dd-challenge-grid,
.dd-company-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.dd-challenge-card,
.dd-company-card {
  border-radius: 14px;
  border: 2px solid var(--dd-node-border);
  background: var(--dd-surface);
  padding: 18px;
}

.dd-challenge-card h3,
.dd-company-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--dd-heading);
}

.dd-chip {
  display: inline-block;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--dd-bg);
  color: var(--dd-text);
  border: 1px solid var(--dd-border);
  margin-bottom: 8px;
}

.dd-footer-note {
  text-align: center;
  padding: 24px 0;
  font-size: 12px;
  color: var(--color-text-tertiary, #94a3b8);
}

@media (max-width: 1024px) {
  .dd-grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .dd-grid-3,
  .dd-grid-2,
  .dd-mode-visual,
  .dd-metric-grid,
  .dd-challenge-grid,
  .dd-company-grid {
    grid-template-columns: 1fr;
  }

  .dd-section-header h2 {
    font-size: 24px;
  }

  .dd-page {
    padding-top: 28px;
  }

  .dd-subnav {
    top: 56px;
    padding: 10px 16px;
  }
}