/* =====================
   TOKENS
===================== */

:root {
  --color-bg: #0a0c09;
  --color-bg-raised: #101309;
  --color-surface: #12150f;
  --color-surface-sunken: #0d0f0a;
  --color-border: rgba(242, 241, 233, 0.10);
  --color-border-strong: rgba(242, 241, 233, 0.20);

  --color-ink: #f2f1e9;
  --color-ink-secondary: #b7bbac;
  --color-ink-muted: #7d8274;
  --color-ink-faint: #565b4e;

  --color-accent: #c98b3f;
  --color-accent-soft: rgba(201, 139, 63, 0.14);

  --color-allow: #5b9c72;
  --color-allow-soft: rgba(91, 156, 114, 0.12);
  --color-escalate: #c98b3f;
  --color-escalate-soft: rgba(201, 139, 63, 0.14);
  --color-deny: #b8594c;
  --color-deny-soft: rgba(184, 89, 76, 0.14);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 28px 72px rgba(0, 0, 0, 0.45);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;

  --font-sans: -apple-system, "Segoe UI", Inter, system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Roboto Mono", Menlo, monospace;
  --max-width: 1240px;
  --max-width-narrow: 800px;

  color-scheme: dark;
}

/* =====================
   RESET / BASE
===================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

h1,
h2,
h3,
h4,
p,
ul,
ol {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--color-ink);
  color: var(--color-bg);
  padding: var(--space-3) var(--space-4);
  border-radius: 0 0 var(--radius-sm) 0;
  font-weight: 600;
}

.skip-link:focus {
  left: 0;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

html {
  scroll-behavior: smooth;
}

/* =====================
   LAYOUT PRIMITIVES
===================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.section-lede {
  max-width: 640px;
  color: var(--color-ink-secondary);
  font-size: 17px;
  margin-top: var(--space-3);
  margin-bottom: var(--space-8);
}

.mono {
  font-family: var(--font-mono);
}

/* =====================
   HEADER
===================== */

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
  background: rgba(10, 12, 9, 0.86);
  backdrop-filter: saturate(140%) blur(10px);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-5);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-ink);
}

.brand-mark {
  width: 24px;
  height: 24px;
  color: var(--color-ink);
  flex-shrink: 0;
}

.brand-name {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.005em;
}

.nav {
  display: flex;
  gap: var(--space-4);
}

.nav a {
  text-decoration: none;
  color: var(--color-ink-secondary);
  font-size: 14px;
  font-weight: 500;
  padding: var(--space-1) 0;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav a:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-border-strong);
}

.nav a[aria-current="page"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

.nav-cta {
  white-space: nowrap;
}

/* =====================
   BUTTONS
===================== */

.cta-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-6);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  font-size: 14.5px;
  border: 1px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
  min-height: 44px;
}

.btn.primary {
  background: var(--color-ink);
  color: var(--color-bg);
  box-shadow: var(--shadow-sm);
}

.btn.primary:hover {
  background: #ffffff;
  box-shadow: var(--shadow-md);
}

.btn.secondary {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-ink);
}

.btn.secondary:hover {
  background: var(--color-surface);
  border-color: var(--color-ink-muted);
}

.btn.large {
  padding: 14px 26px;
  font-size: 15.5px;
}

/* =====================
   HERO
===================== */

.hero {
  padding: var(--space-10) 0 var(--space-9);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 80% 60% at 30% 0%, black 40%, transparent 90%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 0.92fr 1.18fr;
  gap: var(--space-8);
  align-items: start;
}

.hero-content h1 {
  font-size: 58px;
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--color-ink);
  max-width: 13ch;
}

.hero-lede {
  margin-top: var(--space-5);
  font-size: 18px;
  color: var(--color-ink-secondary);
  max-width: 50ch;
}

.hero-lede-secondary {
  margin-top: var(--space-3);
  font-size: 15px;
  color: var(--color-ink-muted);
  max-width: 52ch;
}

.hero-media {
  min-width: 0;
}

/* =====================
   SYSTEM FLOW DIAGRAM (hero)
===================== */

.flow-diagram {
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
  padding: var(--space-5);
}

.flow-diagram-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
}

.flow-diagram-label .live-dot {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-allow);
}

.live-dot::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-allow);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.flow-stack {
  display: flex;
  flex-direction: column;
}

.flow-tier-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-2);
}

.flow-node-body {
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-raised);
}

.flow-node-body span {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--color-ink);
  font-weight: 600;
}

.flow-node-body.flow-node-sm {
  padding: var(--space-2) var(--space-3);
}

.flow-node-body.flow-node-sm span {
  font-size: 12px;
}

.flow-node-body.is-control {
  border-color: rgba(201, 139, 63, 0.45);
  background: var(--color-escalate-soft);
}

.flow-node-body.is-control span {
  color: var(--color-accent);
}

.flow-node-body.is-terminal {
  background: var(--color-allow-soft);
  border-color: rgba(91, 156, 114, 0.45);
  padding: var(--space-4);
  text-align: center;
}

.flow-node-body.is-terminal span {
  color: var(--color-allow);
  font-size: 14px;
}

/* source node: deliberately smaller/muted — this is where the pipeline begins */
.flow-tier-source .flow-node-body {
  max-width: 62%;
  border-style: dashed;
  background: transparent;
}

.flow-tier-source .flow-node-body span {
  color: var(--color-ink-secondary);
  font-weight: 500;
}

/* processing cluster: grouped sub-stages, visually subordinate to source/control/decision */
.flow-cluster {
  position: relative;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-3) var(--space-3);
}

.flow-cluster .flow-tier-tag {
  position: absolute;
  top: -8px;
  left: var(--space-3);
  background: var(--color-surface);
  padding: 0 6px;
  margin-bottom: 0;
}

.flow-cluster-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-left: var(--space-4);
  border-left: 1px solid var(--color-border);
  margin-left: 2px;
}

/* vertical rail connector between stacked tiers */
.rail-connector {
  width: 1px;
  height: 20px;
  background: var(--color-border-strong);
  margin: 0 0 0 1px;
}

/* one node branching into two (policy engine -> outcome paths) */
.rail-branch {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  padding-top: 20px;
  margin-top: 20px;
}

.rail-branch::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 25%;
  right: 25%;
  height: 1px;
  background: var(--color-border-strong);
}

.rail-branch::after {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 20px;
  background: var(--color-border-strong);
}

.rail-branch-item {
  position: relative;
  padding-top: 20px;
}

.rail-branch-item::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 50%;
  width: 1px;
  height: 20px;
  background: var(--color-border-strong);
}

/* two branches converging back into one node (outcome paths -> auditable decision) */
.rail-merge {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  padding-bottom: 20px;
  margin-bottom: 20px;
}

.rail-merge::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 1px;
  height: 20px;
  background: var(--color-border-strong);
}

.rail-merge::before {
  content: "";
  position: absolute;
  bottom: 20px;
  left: 25%;
  right: 25%;
  height: 1px;
  background: var(--color-border-strong);
}

.rail-merge-item {
  position: relative;
  min-height: 1px;
}

.rail-merge-item::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 1px;
  height: 20px;
  background: var(--color-border-strong);
}

/* =====================
   CREDIBILITY STRIP
===================== */

.strip {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-raised);
}

.strip-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--color-ink-muted);
  letter-spacing: 0.02em;
}

/* =====================
   SECTIONS (generic)
===================== */

.section {
  padding: var(--space-9) 0;
}

.section-alt {
  background: var(--color-bg-raised);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section h2 {
  font-size: 33px;
  line-height: 1.2;
  letter-spacing: -0.015em;
  font-weight: 700;
  max-width: 22ch;
}

.section-head {
  max-width: var(--max-width-narrow);
}

/* =====================
   SYSTEM STATEMENT (editorial)
===================== */

.statement {
  padding: var(--space-9) 0;
  text-align: center;
}

.statement-inner {
  max-width: 900px;
  margin: 0 auto;
}

.statement h2 {
  font-size: 40px;
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.015em;
  max-width: none;
  margin: 0 auto;
}

.statement p {
  margin: var(--space-6) auto 0;
  max-width: 620px;
  color: var(--color-ink-secondary);
  font-size: 16.5px;
}

.statement p + p {
  margin-top: var(--space-4);
}

/* =====================
   CAPABILITY BLOCKS
===================== */

.capability-block {
  padding: var(--space-9) 0;
  border-bottom: 1px solid var(--color-border);
}

.capability-block:last-child {
  border-bottom: none;
}

.capability-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: var(--space-8);
  align-items: start;
}

.capability-block:nth-child(even) .capability-grid,
.capability-block.is-reversed .capability-grid {
  direction: rtl;
}

.capability-block:nth-child(even) .capability-grid > *,
.capability-block.is-reversed .capability-grid > * {
  direction: ltr;
}

.capability-index-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-3);
}

.capability-copy h3 {
  font-size: 25px;
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.012em;
  max-width: 16ch;
  margin-bottom: var(--space-5);
}

.capability-copy p {
  color: var(--color-ink-secondary);
  font-size: 15.5px;
  max-width: 48ch;
}

.capability-copy p + ul {
  margin-top: var(--space-5);
}

.spec-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.spec-list li {
  position: relative;
  padding-left: var(--space-5);
  font-size: 14.5px;
  color: var(--color-ink-secondary);
  line-height: 1.5;
}

.spec-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--color-accent);
}

.capability-note {
  margin-top: var(--space-6);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-left: 2px solid var(--color-ink-faint);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--color-ink-muted);
  max-width: 48ch;
}

/* --- visual panel shell shared by all product visuals --- */

.panel {
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.panel-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-sunken);
}

.panel-bar-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-muted);
}

.panel-bar-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.panel-body {
  padding: var(--space-5);
}

/* evidence graph (Tender Intelligence) */

.evidence-graph-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: var(--space-2);
}

.evidence-graph-node {
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  background: var(--color-bg-raised);
}

.evidence-graph-node-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-2);
}

.evidence-graph-node-value {
  font-size: 13px;
  color: var(--color-ink);
  line-height: 1.4;
}

.evidence-graph-arrow {
  color: var(--color-ink-faint);
  font-size: 14px;
}

.evidence-graph-row + .evidence-graph-row {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.evidence-status-line {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-muted);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.status-chip.allow { background: var(--color-allow-soft); color: var(--color-allow); }
.status-chip.deny { background: var(--color-deny-soft); color: var(--color-deny); }
.status-chip.escalate { background: var(--color-escalate-soft); color: var(--color-escalate); }
.status-chip.neutral { background: var(--color-border); color: var(--color-ink-secondary); }

/* commercial analysis table */

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.data-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-faint);
  font-weight: 600;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border-strong);
}

.data-table td {
  padding: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-ink-secondary);
  vertical-align: middle;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table td:first-child {
  color: var(--color-ink);
  font-weight: 600;
}

/* policy matrix */

.policy-matrix {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.policy-rule {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-bg-raised);
}

.policy-rule-id {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-ink);
}

.policy-rule-desc {
  display: block;
  font-size: 12px;
  color: var(--color-ink-muted);
  margin-top: 2px;
}

/* review panel */

.review-field {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 13px;
}

.review-field:last-child {
  border-bottom: none;
}

.review-field-label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-ink-faint);
}

.review-field-value {
  color: var(--color-ink-secondary);
}

.review-field-value strong {
  color: var(--color-ink);
  font-weight: 600;
}

/* =====================
   DECISION PROVENANCE
===================== */

.provenance-questions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-9);
}

.provenance-questions-spaced {
  margin-top: var(--space-7);
}

.provenance-question {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

.provenance-question-num {
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: 13px;
  margin-bottom: var(--space-3);
  display: block;
}

.provenance-question p {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.4;
}

.provenance-rail {
  height: 1px;
  margin-bottom: var(--space-5);
  background: repeating-linear-gradient(
    90deg,
    var(--color-border-strong) 0,
    var(--color-border-strong) 1px,
    transparent 1px,
    transparent 40px
  );
}

.provenance-flow {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-5);
  align-items: stretch;
}

.provenance-node {
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  padding: var(--space-5) var(--space-3);
  text-align: center;
  position: relative;
}

.provenance-node:not(.is-final)::after {
  content: "→";
  position: absolute;
  top: 50%;
  right: -18px;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-ink-faint);
  z-index: 1;
}

.provenance-node-title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--color-ink);
  font-weight: 700;
}

.provenance-node-sub {
  margin-top: var(--space-2);
  font-size: 11.5px;
  color: var(--color-ink-muted);
  line-height: 1.4;
}

.provenance-node.is-final {
  background: var(--color-allow-soft);
  border-color: rgba(91, 156, 114, 0.4);
}

.provenance-node.is-final .provenance-node-title {
  color: var(--color-allow);
}

.provenance-flow-arrow {
  display: none;
}

.provenance-copy {
  margin-top: var(--space-7);
  max-width: 640px;
  color: var(--color-ink-secondary);
  font-size: 15.5px;
}

.provenance-copy p + p {
  margin-top: var(--space-3);
}

/* =====================
   FAIL-CLOSED PRINCIPLES
===================== */

.principles-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-4);
}

.principle-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-4);
  background: var(--color-bg-raised);
}

.principle-index {
  font-family: var(--font-mono);
  color: var(--color-ink-faint);
  font-size: 12px;
  display: block;
  margin-bottom: var(--space-4);
}

.principle-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: var(--space-2);
  line-height: 1.35;
}

.principle-card p {
  font-size: 13px;
  color: var(--color-ink-muted);
  line-height: 1.5;
}

/* =====================
   ARCHITECTURE (layer diagram)
===================== */

.architecture {
  padding: var(--space-9) 0;
  background: var(--color-bg-raised);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.architecture-inner {
  max-width: 1000px;
}

.arch-diagram {
  display: flex;
  flex-direction: column;
  margin-top: var(--space-7);
}

.arch-layer {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-5);
  padding: var(--space-5) var(--space-6);
  align-items: start;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.arch-layer.is-decision {
  background: rgba(201, 139, 63, 0.06);
  border-color: rgba(201, 139, 63, 0.35);
}

.arch-layer-name {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
}

.arch-layer-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink-faint);
}

.arch-layer-name h3 {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--color-ink);
}

.arch-layer-items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.arch-layer-note {
  grid-column: 1 / -1;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-ink-muted);
}

.arch-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-secondary);
  border: 1px solid var(--color-border-strong);
  border-radius: 999px;
  padding: 5px 12px;
  background: var(--color-bg-raised);
}

.arch-chip.is-decision-state {
  color: var(--color-accent);
  border-color: rgba(201, 139, 63, 0.4);
}

.arch-chip.is-review {
  color: var(--color-ink-secondary);
  background: transparent;
  border-style: dashed;
}

/* vertical connector between stacked layers */
.arch-connector {
  width: 1px;
  height: 28px;
  background: var(--color-border-strong);
  margin: 0 0 0 40px;
}

.arch-connector-center {
  height: 28px;
  margin: 0 auto;
}

/* Reasoning <-> Control: side-by-side, interacting rather than sequential */
.arch-interact {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: var(--space-4);
}

.arch-interact .arch-layer-half {
  border-radius: var(--radius-md);
}

.arch-interact-connector {
  position: relative;
  width: 56px;
  align-self: center;
}

.arch-interact-connector::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 4px;
  right: 4px;
  height: 1px;
  background: var(--color-border-strong);
}

.arch-interact-connector::after {
  content: "◂▸";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  text-align: center;
  transform: translateY(-50%);
  font-size: 8px;
  letter-spacing: 22px;
  color: var(--color-ink-faint);
}

.arch-interact-label {
  position: absolute;
  top: -20px;
  left: 0;
  right: 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--color-ink-faint);
  white-space: nowrap;
}

.arch-merge {
  margin-left: 40px;
  margin-right: 40px;
}

.arch-branch-chip-group {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 3px 10px 3px 3px;
  border: 1px dashed var(--color-border-strong);
  border-radius: 999px;
}

.arch-branch-arrow {
  color: var(--color-ink-faint);
  font-size: 11px;
}

/* =====================
   USE CASES
===================== */

.use-case-grid {
  margin-top: var(--space-2);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.use-case {
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.use-case h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--color-ink);
}

.use-case p {
  font-size: 13.5px;
  color: var(--color-ink-muted);
}

/* =====================
   PRODUCT SCOPE
===================== */

.scope-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3) var(--space-6);
  margin-bottom: var(--space-7);
}

.scope-grid-spaced {
  margin-top: var(--space-7);
}

.scope-item {
  display: flex;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14.5px;
  color: var(--color-ink-secondary);
}

.scope-item::before {
  content: "✓";
  color: var(--color-allow);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.scope-boundary {
  border: 1px solid var(--color-border-strong);
  border-left: 2px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: var(--space-5);
  background: var(--color-bg-raised);
}

.scope-boundary p {
  font-size: 14.5px;
  color: var(--color-ink-secondary);
  line-height: 1.6;
}

.scope-boundary p + p {
  margin-top: var(--space-3);
}

.scope-boundary-label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
  display: block;
}

/* =====================
   FINAL CTA
===================== */

.cta-section {
  padding: var(--space-9) 0;
  text-align: center;
}

.cta-section h2 {
  font-size: 36px;
  max-width: 22ch;
  margin: 0 auto;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.cta-section p {
  margin: var(--space-4) auto var(--space-6);
  color: var(--color-ink-secondary);
  font-size: 16px;
  max-width: 48ch;
}

.cta-section .cta-row {
  justify-content: center;
  margin-top: 0;
}

/* =====================
   FOOTER
===================== */

.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-7) 0 var(--space-5);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: var(--space-6);
}

.footer-brand .brand {
  margin-bottom: var(--space-3);
}

.footer-brand p {
  font-size: 13.5px;
  color: var(--color-ink-muted);
  max-width: 34ch;
}

.footer-status {
  margin-top: var(--space-3) !important;
  color: var(--color-ink-faint) !important;
  font-family: var(--font-mono);
  font-size: 11.5px !important;
}

.footer-col-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  margin-bottom: var(--space-4);
}

.footer-nav,
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: 14px;
}

.footer-nav a,
.footer-contact a {
  text-decoration: none;
  color: var(--color-ink-secondary);
}

.footer-nav a:hover,
.footer-contact a:hover {
  color: var(--color-ink);
}

.footer-bottom {
  margin-top: var(--space-7);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-size: 12.5px;
  color: var(--color-ink-faint);
}

/* =====================
   PAGE HEADER (subpages)
===================== */

.page-header {
  padding: var(--space-8) 0 var(--space-7);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 42px;
  line-height: 1.12;
  letter-spacing: -0.01em;
  max-width: 760px;
  margin-bottom: var(--space-4);
}

.page-header-lede {
  max-width: 640px;
  color: var(--color-ink-secondary);
  font-size: 17px;
}

.breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-ink-muted);
  text-decoration: none;
  margin-bottom: var(--space-5);
}

.breadcrumb:hover {
  color: var(--color-ink);
}

/* =====================
   HOMEPAGE CAPABILITY TEASERS
===================== */

.teaser-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.teaser-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  transition: border-color 0.15s ease;
}

.teaser-card:hover {
  border-color: var(--color-border-strong);
}

.teaser-index-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.teaser-card h3 {
  font-size: 19px;
  letter-spacing: -0.005em;
}

.teaser-card p {
  color: var(--color-ink-secondary);
  font-size: 14.5px;
}

.teaser-link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--color-ink);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
}

.teaser-link:hover {
  color: var(--color-accent);
}

/* =====================
   HOMEPAGE ARCHITECTURE TEASER
===================== */

.arch-teaser {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-border);
}

.arch-teaser-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin: var(--space-6) 0;
}

.arch-teaser-arrow {
  color: var(--color-ink-faint);
}

/* =====================
   RESPONSIVE
===================== */

@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-content h1 {
    max-width: none;
  }

  .capability-grid,
  .capability-block:nth-child(even) .capability-grid,
  .capability-block.is-reversed .capability-grid {
    grid-template-columns: 1fr;
    direction: ltr;
  }

  .provenance-questions {
    grid-template-columns: repeat(2, 1fr);
  }

  .provenance-flow {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
  }

  .principles-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .use-case-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .arch-layer {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .arch-interact {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .arch-interact-connector {
    width: 1px;
    height: 32px;
    margin: 0 auto;
  }

  .arch-interact-connector::before {
    top: 0;
    bottom: 0;
    left: 50%;
    right: auto;
    width: 1px;
    height: 100%;
    background: var(--color-border-strong);
  }

  .arch-interact-connector::after {
    content: "▾";
    top: auto;
    bottom: -6px;
    left: 0;
    right: 0;
    letter-spacing: 0;
    font-size: 10px;
    transform: none;
  }

  .arch-interact-label {
    position: static;
    display: block;
    margin-bottom: var(--space-1);
  }

  .arch-connector,
  .arch-merge {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .hero {
    padding: var(--space-8) 0 var(--space-7);
  }

  .hero-content h1 {
    font-size: 34px;
  }

  .section,
  .architecture,
  .statement,
  .capability-block,
  .cta-section {
    padding: var(--space-8) 0;
  }

  .section h2,
  .cta-section h2 {
    font-size: 26px;
    max-width: none;
  }

  .statement h2 {
    font-size: 28px;
  }

  .provenance-questions {
    grid-template-columns: 1fr;
  }

  .provenance-flow {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .provenance-node:not(.is-final)::after {
    content: "↓";
    top: auto;
    bottom: -17px;
    right: 50%;
    transform: translateX(50%);
  }

  .provenance-rail {
    display: none;
  }

  .principles-grid {
    grid-template-columns: 1fr;
  }

  .use-case-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .scope-grid {
    grid-template-columns: 1fr;
  }

  .evidence-graph-row {
    grid-template-columns: 1fr;
  }

  .evidence-graph-arrow {
    display: none;
  }

  .capability-copy h3 {
    max-width: none;
  }

  .teaser-grid {
    grid-template-columns: 1fr;
  }

  .page-header h1 {
    font-size: 30px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }

  .hero-content h1 {
    font-size: 27px;
  }

  .cta-row {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-row .btn,
  .cta-section .btn {
    width: 100%;
  }

  .review-field,
  .arch-layer,
  .policy-rule {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .rail-branch,
  .rail-merge {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .rail-branch::before,
  .rail-merge::before {
    display: none;
  }

  .rail-branch::after {
    left: 50%;
  }

  .rail-merge::after {
    left: 50%;
  }

  .rail-branch-item::before,
  .rail-merge-item::after {
    left: 50%;
  }
}