:root {
  --bg: #0b0f14;
  --bg-secondary: #111820;
  --panel: #151e27;
  --ink: #f3f6f8;
  --muted: #9caab7;
  --line: #27333f;

  --signal: #e7b84b;
  --signal-ink: #10141a;
  --healthy: #54bf83;
  --warning: #e5a84b;
  --critical: #e06767;

  --action: var(--signal);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Space Grotesk", sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

.wrap {
  width: min(1080px, 92vw);
  margin: 0 auto;
}

.section {
  margin-top: 14px;
}

/* ---------- Header / navigation ---------- */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav-row {
  width: min(1080px, 92vw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-family: "IBM Plex Mono", monospace;
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--ink);
}

.brand-mark-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(231, 184, 75, 0.18);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--ink);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  padding: 8px 10px;
  cursor: pointer;
}

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    inset: 60px 0 0 0;
    background: var(--bg);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 12px 5vw 24px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
    border-top: 1px solid var(--line);
  }

  .nav-links[data-open="true"] {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-links a,
  .nav-links .nav-cta {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
  }

  .nav-toggle {
    display: inline-flex;
  }
}

/* ---------- Typography ---------- */

.eyebrow {
  margin: 0;
  color: var(--signal);
  font-size: 11px;
  letter-spacing: 0.14em;
  font-family: "IBM Plex Mono", monospace;
  text-transform: uppercase;
}

h1 {
  margin: 14px 0 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
}

h2 {
  margin: 0 0 10px;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  letter-spacing: -0.005em;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

p {
  margin: 8px 0;
  color: var(--muted);
  line-height: 1.55;
}

ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

li {
  margin: 6px 0;
}

.subhead {
  margin: 16px 0 22px;
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.6;
}

/* Monospace label + display value pattern, e.g. "PRODUCTION DECISION / ALLOW" */
.metric-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}

.metric-value {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--ink);
  margin: 4px 0 0;
}

/* ---------- Sections / containers ---------- */

.hero {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--line);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
}

.section-heading {
  max-width: 62ch;
  margin-bottom: 28px;
}

.section-block {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

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

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

.grid-5 {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

@media (max-width: 900px) {
  .grid,
  .grid-4,
  .grid-5 {
    grid-template-columns: 1fr;
  }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  text-decoration: none;
  border-radius: 999px;
  padding: 11px 20px;
  font-weight: 700;
  font-size: 14px;
  border: 1px solid transparent;
}

.btn-primary {
  color: var(--signal-ink);
  background: var(--signal);
}

.btn-secondary {
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--signal);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 22px;
}

.link-tertiary {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
}

.link-tertiary:hover,
.link-tertiary:focus-visible {
  color: var(--ink);
}

/* ---------- Product / lifecycle / principle cards ---------- */

.product-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.product-card h3 {
  font-size: 1.4rem;
  margin: 10px 0 8px;
}

.product-card .capability-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.product-card .capability-list li {
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 10px;
}

.lifecycle-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 4px;
  counter-reset: lifecycle;
}

.lifecycle-step {
  position: relative;
  padding: 18px 14px 14px;
  border-top: 2px solid var(--line);
}

.lifecycle-step[data-active="true"] {
  border-top-color: var(--signal);
}

.lifecycle-step .metric-label {
  color: var(--signal);
}

.lifecycle-step h3 {
  margin: 6px 0 6px;
  font-size: 1rem;
}

.lifecycle-step p {
  font-size: 0.92rem;
  margin: 0;
}

@media (max-width: 900px) {
  .lifecycle-row {
    grid-template-columns: 1fr;
  }

  .lifecycle-step {
    border-top: none;
    border-left: 2px solid var(--line);
    padding: 6px 0 18px 16px;
  }

  .lifecycle-step[data-active="true"] {
    border-left-color: var(--signal);
    border-top-color: transparent;
  }
}

.principle-card {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.principle-card h3 {
  font-size: 1rem;
}

.principle-card p {
  font-size: 0.94rem;
}

/* ---------- Proof strip ---------- */

.proof-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.proof-strip .metric-value {
  font-size: 1.25rem;
}

.proof-strip[data-loaded="false"] .proof-strip-numeric {
  display: none;
}

@media (max-width: 900px) {
  .proof-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- Code block ---------- */

.code-block {
  margin: 0;
  overflow: auto;
  border-radius: 10px;
  padding: 16px;
  border: 1px solid var(--line);
  background: var(--bg-secondary);
}

.code-block code,
code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.88em;
}

code {
  border-radius: 6px;
  padding: 2px 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--line);
  color: var(--ink);
}

.code-block code {
  background: transparent;
  border: 0;
  padding: 0;
  color: #d7e2ea;
}

/* ---------- SignalLine motif ---------- */

.signal-line {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--line);
  margin: 20px 0;
}

.signal-line svg {
  width: 100%;
  height: 20px;
  overflow: visible;
}

.signal-line line {
  stroke: var(--line);
  stroke-width: 1;
}

.signal-line circle {
  fill: var(--signal);
}

.signal-line .signal-pulse {
  animation: signal-pulse 2.6s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .signal-line .signal-pulse {
    animation: none;
  }
}

@keyframes signal-pulse {
  0%, 100% { opacity: 0.35; r: 3; }
  50% { opacity: 1; r: 4.5; }
}

/* ---------- Hero diagram ---------- */

.hero-diagram {
  margin-top: 40px;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 16px;
  background: var(--panel);
}

/* ---------- Footer ---------- */

.site-footer {
  padding: 48px 0 40px;
  border-top: 1px solid var(--line);
  margin-top: 8px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 24px;
}

.footer-grid h4 {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}

.footer-grid ul {
  list-style: none;
  padding: 0;
}

.footer-grid a {
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  line-height: 2.1;
}

.footer-grid a:hover,
.footer-grid a:focus-visible {
  color: var(--ink);
}

.footer-tagline {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

@media (max-width: 780px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- Cross-brand identifier (used on product surfaces) ---------- */

.provenance-mark {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}

/* ---------- Focus states ---------- */

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}