/* ============================================
   CGI INTELLIGENCE ECOSYSTEM PAGE
   ============================================ */

/* Ecosystem hero */
.eco-hero {
  background: var(--ink);
  color: var(--mist);
  padding: 8rem 0 5rem;
  position: relative;
  overflow: hidden;
}
.eco-hero::before {
  content: '';
  position: absolute;
  top: 50%; right: -8%;
  transform: translateY(-50%);
  width: 600px; height: 600px;
  background-image: url('assets/cgi-logo-full.png');
  background-size: contain;
  background-repeat: no-repeat;
  opacity: 0.16;
  pointer-events: none;
}
.eco-hero .container { position: relative; z-index: 1; }
.eco-hero h1 { color: var(--mist); margin: 1rem 0 1.5rem; max-width: 18ch; }
.eco-hero p { color: var(--silver); max-width: 56ch; font-size: 1.1rem; }

.eco-hero-stats {
  display: flex;
  gap: 3rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}
.eco-hero-stats .ehs {
  border-left: 2px solid var(--signal);
  padding-left: 1rem;
}
.eco-hero-stats .ehs .n {
  font-size: 1.9rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  color: var(--mist);
  line-height: 1;
}
.eco-hero-stats .ehs .l {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver);
  margin-top: 0.4rem;
}

/* Visible-layer statement band */
.visible-layer {
  background: var(--paper);
  padding: clamp(4rem, 7vw, 6rem) 0;
}
.visible-layer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
}
.visible-layer h2 { margin-bottom: 1.25rem; }
.visible-layer .vl-statement {
  font-family: var(--sans);
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--ink);
  padding: 1.75rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

/* Two-layer split */
.layer-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  margin-top: 2.5rem;
}
.layer-col { padding: 1.85rem 1.6rem; }
.layer-col.public { background: var(--mist); border-right: 1px solid var(--line); }
.layer-col.private { background: var(--ink); }
.layer-col .lc-tag {
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.layer-col.public .lc-tag { color: var(--steel); }
.layer-col.private .lc-tag { color: var(--signal); }
.layer-col h4 { margin-bottom: 0.6rem; font-size: 1rem; }
.layer-col.private h4 { color: var(--mist); }
.layer-col p { font-size: 0.86rem; margin: 0; }
.layer-col.private p { color: var(--silver); }

@media (max-width: 760px) {
  .visible-layer-grid { grid-template-columns: 1fr; }
  .layer-split { grid-template-columns: 1fr; }
  .layer-col.public { border-right: none; border-bottom: 1px solid var(--line); }
}

/* Ecosystem modules section */
.eco-modules { background: var(--mist); padding: clamp(5rem, 9vw, 8rem) 0; }

/* Roadmap section */
.eco-roadmap { background: var(--paper); padding: clamp(5rem, 9vw, 8rem) 0; }

/* Decision tree section */
.eco-decision { background: var(--mist); padding: clamp(5rem, 9vw, 8rem) 0; border-top: 1px solid var(--line); }

/* Private extension list */
.private-extends {
  background: var(--ink);
  color: var(--mist);
  padding: clamp(5rem, 9vw, 8rem) 0;
}
.private-extends h2 { color: var(--mist); margin: 1rem 0 1.25rem; }
.private-extends .pe-lead { color: var(--silver); max-width: 60ch; margin-bottom: 3rem; font-size: 1.05rem; }
.pe-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem 2.5rem;
}
.pe-grid li {
  list-style: none;
  font-size: 0.88rem;
  color: var(--silver);
  padding: 0.6rem 0 0.6rem 1.1rem;
  border-bottom: 1px solid var(--line-dark);
  position: relative;
}
.pe-grid li::before {
  content: '';
  position: absolute;
  left: 0; top: 1rem;
  width: 6px; height: 1px;
  background: var(--signal);
}
@media (max-width: 760px) {
  .pe-grid { grid-template-columns: 1fr; }
}

/* ---- Phase accordion ---- */
.gpt-phase { margin-bottom: 1rem; }

button.gpt-phase-header {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.5rem 1.5rem;
  background: var(--mist);
  border: 1px solid var(--line);
  cursor: pointer;
  text-align: left;
  font-family: var(--sans);
  transition: border-color 0.18s, background 0.18s;
}

button.gpt-phase-header:hover { border-color: var(--signal); }
button.gpt-phase-header[aria-expanded="true"] {
  border-color: var(--ink);
  border-bottom-color: var(--line);
}

.gpt-phase-count {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--silver);
  white-space: nowrap;
}

.gpt-phase-chev {
  width: 11px; height: 11px;
  border-right: 1.5px solid var(--steel);
  border-bottom: 1.5px solid var(--steel);
  transform: rotate(45deg);
  transition: transform 0.22s;
  flex-shrink: 0;
  margin-top: -3px;
}
button.gpt-phase-header[aria-expanded="true"] .gpt-phase-chev {
  transform: rotate(-135deg);
  margin-top: 3px;
  border-color: var(--signal);
}

.gpt-panel {
  display: none;
  border: 1px solid var(--line);
  border-top: none;
}
.gpt-panel.open {
  display: block;
}
.gpt-panel > .gpt-grid {
  gap: 1.25rem;
  padding: 1.5rem;
}

/* keep phase header text rhythm */
button.gpt-phase-header .gpt-phase-num { color: var(--signal); }
button.gpt-phase-header .gpt-phase-title { color: var(--ink); }

@media (max-width: 600px) {
  button.gpt-phase-header { flex-wrap: wrap; gap: 0.5rem 0.85rem; padding: 1.15rem; }
  .gpt-phase-count { margin-left: 0; width: 100%; order: 3; }
  .gpt-phase-chev { position: absolute; right: 1.15rem; }
  button.gpt-phase-header { position: relative; }
}

/* Phase spacing */
.gpt-phase { margin-bottom: 0.6rem; }