/* Blueprint design system — schematic, dark, technical */
:root {
  /* Core palette — deep blueprint blues */
  --bp-void: #050b18;
  --bp-deep: #0a1628;
  --bp-paper: #0f1f3a;
  --bp-surface: #15294a;
  --bp-line: #1e3a5f;
  --bp-line-soft: rgba(120, 170, 230, 0.14);
  --bp-line-grid: rgba(120, 170, 230, 0.07);

  /* Ink */
  --bp-ink: #c8dcf5;
  --bp-ink-dim: #7c98c0;
  --bp-ink-faint: #4d6889;

  /* Accents — schematic markers */
  --bp-cyan: #5fc8e8;
  --bp-amber: #f0b75a;
  --bp-coral: #e87b6b;
  --bp-mint: #6fd6a8;
  --bp-lilac: #b08cdb;
  --bp-white: #f4f8ff;

  /* Stage hues */
  --stage-precheck: #e87b6b;
  --stage-foundations: #5fc8e8;
  --stage-services: #6fd6a8;
  --stage-intelligence: #b08cdb;
  --stage-polish: #f0b75a;

  /* Type */
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, monospace;
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* Spacing */
  --gutter: 32px;
  --rule: 1px solid var(--bp-line);
  --rule-soft: 1px dashed var(--bp-line-soft);
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bp-void);
  color: var(--bp-ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

body {
  background-image:
    linear-gradient(var(--bp-line-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bp-line-grid) 1px, transparent 1px),
    radial-gradient(ellipse at top, rgba(95, 200, 232, 0.06), transparent 60%);
  background-size: 32px 32px, 32px 32px, 100% 100%;
  background-position: -1px -1px, -1px -1px, 0 0;
  min-height: 100vh;
}

/* Type scale */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--bp-white);
  margin: 0;
}
h1 { font-size: clamp(40px, 5vw, 72px); line-height: 1; letter-spacing: -0.03em; }
h2 { font-size: 28px; line-height: 1.15; }
h3 { font-size: 18px; line-height: 1.2; text-transform: uppercase; letter-spacing: 0.08em; color: var(--bp-cyan); font-weight: 600; }
h4 { font-size: 15px; font-weight: 600; color: var(--bp-ink); }

p { margin: 0 0 1em; color: var(--bp-ink-dim); }
a { color: var(--bp-cyan); text-decoration: none; border-bottom: 1px dashed currentColor; }
a:hover { color: var(--bp-white); }

code, pre, .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
}
code { background: var(--bp-deep); padding: 1px 6px; border: 1px solid var(--bp-line); border-radius: 2px; color: var(--bp-cyan); }
pre {
  background: var(--bp-deep);
  border: 1px solid var(--bp-line);
  padding: 16px;
  overflow-x: auto;
  font-size: 13px;
  color: var(--bp-ink);
  position: relative;
}
pre::before {
  content: '';
  position: absolute; top: 0; left: 0; bottom: 0;
  width: 3px; background: var(--bp-cyan);
}

/* Layout */
.bp-page { max-width: 1320px; margin: 0 auto; padding: 32px 48px 96px; }
.bp-row { display: flex; gap: 24px; align-items: flex-start; }
.bp-col { flex: 1; min-width: 0; }
.bp-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.bp-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.bp-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

/* Top bar */
.bp-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 48px;
  border-bottom: var(--rule);
  background: rgba(5, 11, 24, 0.85);
  backdrop-filter: blur(10px);
  position: sticky; top: 0; z-index: 50;
  font-family: var(--font-mono); font-size: 12px;
}
.bp-topbar .brand {
  display: flex; align-items: center; gap: 12px;
  color: var(--bp-white); text-transform: uppercase; letter-spacing: 0.18em;
  border-bottom: none;
}
.bp-topbar .brand-mark {
  width: 24px; height: 24px;
  border: 1px solid var(--bp-cyan);
  position: relative;
  transform: rotate(45deg);
}
.bp-topbar .brand-mark::after {
  content: ''; position: absolute; inset: 4px;
  border: 1px solid var(--bp-cyan);
}
.bp-topbar nav { display: flex; gap: 24px; }
.bp-topbar nav a {
  color: var(--bp-ink-dim);
  border-bottom: none;
  text-transform: uppercase; letter-spacing: 0.14em;
}
.bp-topbar nav a:hover, .bp-topbar nav a.active { color: var(--bp-cyan); }
.bp-topbar .meta { color: var(--bp-ink-faint); }

/* Card / panel */
.bp-panel {
  background: linear-gradient(180deg, var(--bp-paper) 0%, var(--bp-deep) 100%);
  border: 1px solid var(--bp-line);
  position: relative;
  padding: 24px;
}
.bp-panel.tight { padding: 16px; }
.bp-panel .corner {
  position: absolute; width: 8px; height: 8px;
  border: 1px solid var(--bp-cyan);
}
.bp-panel .corner.tl { top: -1px; left: -1px; border-right: none; border-bottom: none; }
.bp-panel .corner.tr { top: -1px; right: -1px; border-left: none; border-bottom: none; }
.bp-panel .corner.bl { bottom: -1px; left: -1px; border-right: none; border-top: none; }
.bp-panel .corner.br { bottom: -1px; right: -1px; border-left: none; border-top: none; }

/* Labels */
.bp-label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--bp-ink-faint);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.bp-label::before {
  content: ''; width: 12px; height: 1px; background: var(--bp-cyan);
}
.bp-label.no-tick::before { display: none; }

.bp-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 8px;
  border: 1px solid currentColor;
  color: var(--bp-cyan);
  background: rgba(95, 200, 232, 0.06);
}
.bp-tag.amber { color: var(--bp-amber); background: rgba(240, 183, 90, 0.06); }
.bp-tag.coral { color: var(--bp-coral); background: rgba(232, 123, 107, 0.06); }
.bp-tag.mint { color: var(--bp-mint); background: rgba(111, 214, 168, 0.06); }
.bp-tag.lilac { color: var(--bp-lilac); background: rgba(176, 140, 219, 0.06); }
.bp-tag.dim { color: var(--bp-ink-faint); }

/* Schematic dividers */
.bp-rule {
  height: 1px;
  background: var(--bp-line);
  margin: 32px 0;
  position: relative;
}
.bp-rule::before, .bp-rule::after {
  content: ''; position: absolute; top: -3px;
  width: 7px; height: 7px;
  background: var(--bp-cyan);
  transform: rotate(45deg);
}
.bp-rule::before { left: 0; }
.bp-rule::after { right: 0; }

/* Schematic ticks */
.bp-tick-row {
  display: flex; align-items: center; gap: 0;
  height: 16px;
  border-bottom: 1px solid var(--bp-line);
  position: relative;
}
.bp-tick-row::before {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0;
  background-image: linear-gradient(90deg, var(--bp-line) 1px, transparent 1px);
  background-size: 8px 100%;
  height: 4px;
  opacity: 0.5;
}

/* Checklist (persistent) */
.bp-check-list { list-style: none; padding: 0; margin: 0; }
.bp-check-list li {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--bp-line);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--bp-ink);
}
.bp-check-list li:last-child { border-bottom: none; }
.bp-check-list input[type="checkbox"] {
  appearance: none;
  width: 16px; height: 16px;
  border: 1px solid var(--bp-cyan);
  background: transparent;
  margin: 2px 0 0;
  flex-shrink: 0;
  cursor: pointer;
  position: relative;
}
.bp-check-list input[type="checkbox"]:checked {
  background: var(--bp-cyan);
}
.bp-check-list input[type="checkbox"]:checked::after {
  content: '✕';
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; color: var(--bp-deep);
}
.bp-check-list li.done { color: var(--bp-ink-faint); text-decoration: line-through; text-decoration-color: var(--bp-ink-faint); }
.bp-check-list .item-meta { color: var(--bp-ink-faint); margin-left: auto; padding-left: 12px; flex-shrink: 0; }

/* Stat */
.bp-stat { font-family: var(--font-mono); }
.bp-stat .num { font-size: 32px; color: var(--bp-white); font-weight: 500; letter-spacing: -0.02em; display: block; line-height: 1; }
.bp-stat .lbl { font-size: 10px; text-transform: uppercase; letter-spacing: 0.18em; color: var(--bp-ink-faint); margin-top: 8px; display: block; }

/* Collapsible */
.bp-disclose summary {
  cursor: pointer; list-style: none;
  padding: 12px 16px;
  border: 1px solid var(--bp-line);
  background: var(--bp-paper);
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--font-mono); font-size: 12px;
  text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--bp-ink);
}
.bp-disclose summary::-webkit-details-marker { display: none; }
.bp-disclose summary::after {
  content: '+'; font-size: 18px; color: var(--bp-cyan);
}
.bp-disclose[open] summary::after { content: '−'; }
.bp-disclose .body {
  padding: 16px; border: 1px solid var(--bp-line); border-top: none;
  background: var(--bp-deep);
}

/* Tabs */
.bp-tabs { display: flex; gap: 0; border-bottom: 1px solid var(--bp-line); margin-bottom: 16px; }
.bp-tabs button {
  background: transparent; border: 1px solid var(--bp-line); border-bottom: none;
  color: var(--bp-ink-dim);
  padding: 10px 18px; font-family: var(--font-mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.14em; cursor: pointer;
  margin-right: -1px; margin-bottom: -1px;
}
.bp-tabs button.active {
  background: var(--bp-paper); color: var(--bp-cyan);
  border-bottom: 1px solid var(--bp-paper);
  position: relative; z-index: 2;
}
.bp-tab-pane { display: none; padding: 16px 0; }
.bp-tab-pane.active { display: block; }

/* Stage cards */
.bp-stage-card {
  background: linear-gradient(180deg, var(--bp-paper) 0%, var(--bp-deep) 100%);
  border: 1px solid var(--bp-line);
  padding: 24px;
  position: relative;
  display: block;
  border-bottom: none;
  text-decoration: none;
  color: var(--bp-ink);
  transition: transform 0.15s, border-color 0.15s;
}
.bp-stage-card:hover { transform: translateY(-2px); border-color: var(--stage-color, var(--bp-cyan)); }
.bp-stage-card .index {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--stage-color, var(--bp-cyan));
  letter-spacing: 0.18em; text-transform: uppercase;
}
.bp-stage-card .title {
  font-family: var(--font-display); font-size: 24px;
  color: var(--bp-white); margin: 6px 0 12px;
}
.bp-stage-card .desc { color: var(--bp-ink-dim); font-size: 13px; }
.bp-stage-card .accent {
  position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--stage-color, var(--bp-cyan));
}

/* Schematic helpers */
.bp-schema-frame {
  border: 1px solid var(--bp-line);
  background: var(--bp-deep);
  padding: 24px;
  position: relative;
}
.bp-schema-frame .axis-label {
  position: absolute;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--bp-ink-faint); letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* SVG strokes */
.svg-bg { fill: none; }
.svg-grid { stroke: var(--bp-line-grid); stroke-width: 1; }
.svg-line { stroke: var(--bp-line); stroke-width: 1; fill: none; }
.svg-axis { stroke: var(--bp-ink-faint); stroke-width: 1; }
.svg-edge { stroke: var(--bp-cyan); stroke-width: 1.5; fill: none; }
.svg-edge.amber { stroke: var(--bp-amber); }
.svg-edge.coral { stroke: var(--bp-coral); }
.svg-edge.mint { stroke: var(--bp-mint); }
.svg-edge.lilac { stroke: var(--bp-lilac); }
.svg-node-bg { fill: var(--bp-paper); stroke: var(--bp-line); }
.svg-text { fill: var(--bp-ink); font-family: var(--font-mono); font-size: 11px; }
.svg-text-dim { fill: var(--bp-ink-faint); font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; }
.svg-text-bright { fill: var(--bp-white); font-family: var(--font-display); font-size: 13px; }

/* Footer */
.bp-footer {
  margin-top: 96px; padding: 32px 48px;
  border-top: var(--rule);
  font-family: var(--font-mono); font-size: 11px;
  color: var(--bp-ink-faint);
  display: flex; justify-content: space-between;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Crosshair */
.crosshair { position: relative; }
.crosshair::before, .crosshair::after {
  content: ''; position: absolute;
  background: var(--bp-cyan);
  pointer-events: none;
}
.crosshair::before { width: 1px; height: 16px; left: 50%; top: -8px; }
.crosshair::after { height: 1px; width: 16px; top: 50%; left: -8px; }

/* Print */
@media print {
  body { background: white; color: black; }
  .bp-topbar, .bp-footer { display: none; }
}