/* ============================================================
   CORRELATING RESONANCE — landing page
   Brand alignment (CD input v0.1 Part A): palette and type stack
   adopted from ebono_au_site's root theme (see ebono_brand/tokens.css
   for the canonical values) rather than the app pages' own paper/ink
   scheme. This file is landing-page-only — the four phase tool pages
   keep their existing light theme; Part A scopes the dark ground to
   the landing page specifically.
   ============================================================ */
/* Palette and typefaces come from /ebono_brand.css, which every page loading
   this file also loads, and loads first. They were duplicated here — the same
   eight names and values as ebono.au/styles.css, down to the mixed casing of
   #ffcBA4 — until 24 Aug 2026. The header comment above already pointed at a
   canonical brand file; this is that file, finally written.

   --hover-artie is not carried over: it is a corporate-site strand colour and
   was used nowhere on this surface. */

:root {
  /* Semantic roles for the landing surface — a dark mapping of the brand.
     Components below refer only to these, never to --ebono-* directly. */
  --ground:         var(--ebono-black);
  --ground-edge:    var(--ebono-navy-edge);
  --body-text:      var(--ebono-silver);
  --body-dim:       var(--ebono-silver-dim);
  --heading:        var(--ebono-white);
  --highlight:      var(--ebono-ice);
  --highlight-wash: var(--ebono-ice-dim);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--ground);
  color: var(--body-text);
  font-family: var(--ebono-font-display);
  line-height: 1.7;
  min-height: 100vh;
}

/* ── Grain overlay ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.035'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 100;
  opacity: 0.6;
}

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  border-bottom: 2px solid var(--ground-edge);
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 900px 600px at 50% -10%, rgba(22,38,74,0.35), transparent 60%),
    linear-gradient(180deg, var(--ground) 0%, #06090d 100%);
}

/* Background rule lines — like manuscript paper, dimmed for dark ground */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent,
    transparent 39px,
    var(--ground-edge) 39px,
    var(--ground-edge) 40px
  );
  opacity: 0.35;
  pointer-events: none;
}

.hero-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 4rem 3rem;
  position: relative;
  z-index: 2;
  max-width: 900px;
}

.hero-eyebrow {
  font-family: var(--ebono-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--highlight);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hero-eyebrow::before {
  content: '';
  width: 2rem;
  height: 1px;
  background: var(--highlight);
}

.hero-title {
  font-family: var(--ebono-font-display);
  font-weight: 380;
  font-size: clamp(3rem, 7vw, 6rem);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--heading);
  margin-bottom: 0.2em;
}

.hero-title em {
  font-style: italic;
  font-weight: 380;
  color: var(--highlight);
}

.hero-subtitle {
  font-family: var(--ebono-font-body);
  font-weight: 300;
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  color: var(--body-text);
  letter-spacing: 0.01em;
  margin-bottom: 2.5rem;
  font-style: italic;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--body-dim);
  max-width: 640px;
  line-height: 1.75;
  margin-bottom: 3rem;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: linear-gradient(135deg, var(--highlight), var(--body-text));
  color: var(--ground);
  text-decoration: none;
  padding: 0.85rem 2rem;
  font-family: var(--ebono-font-body);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: transform 0.2s, gap 0.2s, box-shadow 0.2s;
  border-radius: 999px;
}

.hero-cta:hover { transform: translateY(-1px); gap: 1.1rem; box-shadow: 0 10px 30px -8px rgba(169,220,239,0.35); }

.hero-cta-arrow { font-size: 1.1rem; }

.hero-footer {
  padding: 1.5rem 4rem;
  border-top: 1px solid var(--ground-edge);
  display: flex;
  gap: 3rem;
  position: relative;
  z-index: 2;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.hero-stat-num {
  font-family: var(--ebono-font-body);
  font-weight: 700;
  font-size: 1.8rem;
  color: var(--heading);
  line-height: 1;
}

.hero-stat-label {
  font-family: var(--ebono-font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--body-dim);
}

/* ── Overview section (currently unused by index.html; kept in sync
   in case it comes back into use — not deleted, see brief report) ── */
.overview {
  padding: 6rem 4rem;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  border-bottom: 1px solid var(--ground-edge);
  max-width: 1200px;
  margin: 0 auto;
}

.overview-label {
  font-family: var(--ebono-font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--body-dim);
  padding-top: 0.4rem;
}

.overview-body h2 {
  font-family: var(--ebono-font-body);
  font-weight: 400;
  font-size: 2rem;
  color: var(--heading);
  margin-bottom: 1.25rem;
  line-height: 1.2;
}

.overview-body p {
  font-size: 0.95rem;
  color: var(--body-dim);
  margin-bottom: 1rem;
  max-width: 640px;
}

/* Concept types */
.concept-types {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.concept-type {
  background: var(--ebono-navy);
  border: 1px solid var(--ground-edge);
  border-radius: 3px;
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
}

.concept-type::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
}

.ct-differentiating::before { background: var(--highlight); }
.ct-bridging::before { background: var(--body-text); }
.ct-boundary::before { background: var(--ground-edge); }

.concept-type-name {
  font-family: var(--ebono-font-body);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--heading);
  margin-bottom: 0.5rem;
}

.concept-type-desc {
  font-size: 0.78rem;
  color: var(--body-dim);
  line-height: 1.5;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 300;
}

/* ── Phase steps ── */
.phases {
  padding: 6rem 4rem;
  border-bottom: 1px solid var(--ground-edge);
}

.phases-header {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  max-width: 1200px;
  margin: 0 auto 4rem;
}

.phases-header-label {
  font-family: var(--ebono-font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--body-dim);
  padding-top: 0.4rem;
}

.phases-header h2 {
  font-family: var(--ebono-font-body);
  font-weight: 400;
  font-size: 2rem;
  color: var(--heading);
  line-height: 1.2;
}

.phases-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.phase-card {
  background: var(--ebono-navy);
  border: 1px solid var(--ground-edge);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
  text-decoration: none;
  color: inherit;
  animation: fadeUp 0.5s ease both;
}

.phase-card:nth-child(1) { animation-delay: 0.1s; }
.phase-card:nth-child(2) { animation-delay: 0.2s; }
.phase-card:nth-child(3) { animation-delay: 0.3s; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.phase-card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.45);
  border-color: var(--highlight);
  transform: translateY(-2px);
}

.phase-card-top {
  padding: 1.75rem 1.75rem 1.25rem;
  border-bottom: 1px solid var(--ground-edge);
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.phase-num {
  font-family: var(--ebono-font-body);
  font-weight: 700;
  font-size: 3rem;
  line-height: 1;
  color: var(--ground-edge);
  flex-shrink: 0;
  margin-top: -0.1em;
  transition: color 0.2s;
}

.phase-card:hover .phase-num { color: var(--highlight); }

.phase-card-meta {}

.phase-tag-label {
  font-family: var(--ebono-font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--body-dim);
  margin-bottom: 0.3rem;
}

.phase-name {
  font-family: var(--ebono-font-body);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--heading);
  line-height: 1.2;
}

.phase-card-body {
  padding: 1.25rem 1.75rem;
  flex: 1;
}

.phase-desc {
  font-size: 0.85rem;
  color: var(--body-dim);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.phase-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.phase-steps li {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--ebono-font-mono);
  font-size: 0.68rem;
  color: var(--body-dim);
  letter-spacing: 0.02em;
}

.phase-steps li::before {
  content: '→';
  color: var(--highlight);
  flex-shrink: 0;
}

.phase-card-footer {
  padding: 1rem 1.75rem;
  border-top: 1px solid var(--ground-edge);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.phase-io {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.io-chip {
  font-family: var(--ebono-font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.15rem 0.45rem;
  border-radius: 2px;
}

.io-in  { background: var(--ground-edge); color: var(--body-dim); }
.io-out { background: var(--highlight-wash); color: var(--highlight); }

.phase-link-arrow {
  font-size: 1rem;
  color: var(--body-dim);
  transition: color 0.2s, transform 0.2s;
}

.phase-card:hover .phase-link-arrow { color: var(--highlight); transform: translateX(4px); }

/* ── Workflow diagram ── */
.workflow {
  padding: 5rem 4rem;
  background: var(--ebono-navy);
  color: var(--body-text);
  border-bottom: 2px solid var(--ground-edge);
}

.workflow-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.workflow-label {
  font-family: var(--ebono-font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--body-dim);
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.workflow-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--ground-edge);
}

.workflow-flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.flow-step {
  flex: 1;
  min-width: 140px;
  padding: 1.5rem;
  border-right: 1px solid var(--ground-edge);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.flow-step:last-child { border-right: none; }

.flow-step-phase {
  font-family: var(--ebono-font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--highlight);
}

.flow-step-name {
  font-family: var(--ebono-font-body);
  font-weight: 600;
  font-size: 1rem;
  color: var(--heading);
  line-height: 1.2;
}

.flow-step-desc {
  font-size: 0.75rem;
  color: var(--body-dim);
  line-height: 1.5;
  font-family: var(--ebono-font-body);
  font-weight: 300;
  flex: 1;
}

.flow-step-output {
  font-family: var(--ebono-font-mono);
  font-size: 0.6rem;
  color: var(--highlight);
  letter-spacing: 0.05em;
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--ground-edge);
}

/* ── Output types (currently unused by index.html; kept in sync,
   see brief report) ── */
.outputs-section {
  padding: 6rem 4rem;
  border-bottom: 1px solid var(--ground-edge);
  max-width: 1200px;
  margin: 0 auto;
}

.outputs-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
}

.outputs-label {
  font-family: var(--ebono-font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--body-dim);
  padding-top: 0.4rem;
}

.outputs-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.output-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1rem 0;
  border-bottom: 1px solid var(--ground-edge);
}

.output-item:last-child { border-bottom: none; }

.output-stage {
  font-family: var(--ebono-font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--ground-edge);
  color: var(--body-dim);
  padding: 0.2rem 0.5rem;
  border-radius: 2px;
  white-space: nowrap;
  margin-top: 0.15rem;
}

.output-name {
  font-family: var(--ebono-font-body);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--heading);
  margin-bottom: 0.2rem;
}

.output-desc {
  font-size: 0.8rem;
  color: var(--body-dim);
  line-height: 1.5;
}

/* ── Footer ── */
footer {
  padding: 2.5rem 4rem;
  border-top: 2px solid var(--ground-edge);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-wordmark {
  font-family: var(--ebono-font-display);
  font-style: italic;
  font-size: 1rem;
  color: var(--heading);
}

.footer-meta {
  font-family: var(--ebono-font-mono);
  font-size: 0.65rem;
  color: var(--body-dim);
  letter-spacing: 0.08em;
}

/* Entity footer (CD input v0.1 Part B item 1) */
.footer-entity {
  width: 100%;
  padding-top: 1.25rem;
  margin-top: 1.25rem;
  border-top: 1px solid var(--ground-edge);
  font-family: var(--ebono-font-mono);
  font-size: 0.65rem;
  color: var(--body-dim);
  letter-spacing: 0.04em;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  justify-content: space-between;
}

.footer-entity a {
  color: var(--body-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.footer-entity a:hover { color: var(--highlight); border-color: var(--highlight); }

.footer-legal-links { display: flex; gap: 1.25rem; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .hero-body, .hero-footer { padding-left: 2rem; padding-right: 2rem; }
  .overview, .phases, .phases-header, .phases-grid,
  .workflow, .outputs-section { padding-left: 2rem; padding-right: 2rem; }
  .overview, .outputs-grid { grid-template-columns: 1fr; gap: 2rem; }
  .phases-header { grid-template-columns: 1fr; gap: 1rem; }
  .phases-grid { grid-template-columns: 1fr; }
  .concept-types { grid-template-columns: 1fr; }
  .hero-footer { gap: 1.5rem; }
  footer { padding: 2rem; flex-direction: column; align-items: flex-start; }
  .footer-entity { flex-direction: column; gap: 0.6rem; }
}