/* ============================================================
 * AI4EBITDA - HOME PAGE STYLES
 * Causal chain, philosophy, stats row, proof cards, CTA section.
 * Used only on index.php.
 * ============================================================ */

/* ===================== CAUSAL CHAIN ===================== */
.chain-section { padding: 5.5rem 0; background: var(--void2); }
.chain-map {
  --chain-gap: 4.4rem;
  display: grid;
  grid-template-columns:
    minmax(0, 1fr) var(--chain-gap)
    minmax(0, 1fr) var(--chain-gap)
    minmax(0, 1fr) var(--chain-gap)
    minmax(0, 1fr);
  column-gap: 0;
  row-gap: 0;
  width: 100%;
  margin: 0 0 4.9rem;
  position: relative;
}
.chain-map::before {
  display: none;
}
.chain-marker {
  position: relative;
  align-self: end;
  min-height: 4.1rem;
  padding-bottom: 1.45rem;
  color: var(--navy);
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .2em;
  line-height: 1.4;
  text-transform: uppercase;
  white-space: nowrap;
  z-index: 1;
}
.chain-marker::after {
  content: '\21E7';
  position: absolute;
  bottom: .05rem;
  color: var(--teal);
  font-size: 2.45rem;
  font-weight: 800;
  line-height: 1;
  transform: rotate(180deg);
  filter: drop-shadow(0 0 9px rgba(51,190,202,.7));
  animation: markerDrop 1.9s ease-in-out infinite;
  z-index: 3;
}
.chain-marker-start {
  grid-column: 1 / 4;
  grid-row: 1;
  justify-self: start;
}
.chain-marker-start::after { left: 0; }
.chain-marker-end {
  grid-column: 5 / 8;
  grid-row: 1;
  justify-self: end;
  text-align: right;
}
.chain-marker-end::after { right: 0; }
.chain-marker-end::after {
  animation-delay: .35s;
}
.chain-node-1 { grid-column: 1; grid-row: 2; }
.chain-node-2 { grid-column: 3; grid-row: 2; }
.chain-node-3 { grid-column: 5; grid-row: 2; }
.chain-node-4 { grid-column: 7; grid-row: 2; }
.chain-flow {
  display: contents;
  pointer-events: none;
}
.chain-flow span {
  display: grid;
  justify-items: center;
  justify-self: stretch;
  align-self: center;
  gap: 0;
  color: var(--navy);
  font-size: .52rem;
  font-weight: 800;
  letter-spacing: .08em;
  line-height: 1;
  text-transform: uppercase;
  z-index: 8;
}
.chain-flow span:nth-child(1) {
  grid-column: 2;
  grid-row: 2;
}
.chain-flow span:nth-child(2) {
  grid-column: 4;
  grid-row: 2;
}
.chain-flow span:nth-child(3) {
  grid-column: 6;
  grid-row: 2;
}
.chain-flow span::after {
  content: '';
  width: 1.05rem;
  height: 1.05rem;
  border-top: 3px solid var(--teal);
  border-right: 3px solid var(--teal);
  filter: drop-shadow(0 0 6px rgba(51,190,202,.35));
  transform: rotate(45deg);
}
.chain-flow strong {
  display: none;
}
.chain-dependent {
  grid-column: 1 / 8;
  grid-row: 3;
  height: 1.55rem;
  margin: 1rem 2rem 0;
  border-right: 2px solid rgba(33,89,104,.42);
  border-bottom: 2px solid rgba(33,89,104,.42);
  border-left: 2px solid rgba(33,89,104,.42);
  position: relative;
}
.chain-dependent::before {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 2px;
  height: .65rem;
  background: rgba(33,89,104,.42);
  transform: translate(-50%, 100%);
}
.chain-dependent span {
  position: absolute;
  left: 50%;
  bottom: -1.9rem;
  padding: 0 .75rem;
  background: var(--light);
  color: var(--navy);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .18em;
  line-height: 1;
  text-transform: uppercase;
  transform: translateX(-50%);
  white-space: nowrap;
}
.cn {
  background: var(--panel); border: 1px solid var(--g3); border-top: 3px solid var(--g3);
  min-height: 20.5rem;
  padding: 1.4rem 1.2rem;
  position: relative;
  transition: transform .2s ease, box-shadow .2s ease;
  z-index: 2;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.cn:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 32px rgba(7,9,13,.12);
}
.cn.hl { border-top-color: var(--teal); border-color: var(--teal); background: rgba(51,190,202,.06); }
.cn.hl .cn-title { color: var(--teal); }
.cn-num { font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--g2); margin-bottom: .5rem; font-weight: 600; }
.cn-title { font-size: 1rem; font-weight: 700; color: var(--white); margin-bottom: .5rem; }
.cn-desc {
  margin-bottom: 1rem;
  font-size: .9rem;
  color: var(--g2);
  font-weight: 300;
  line-height: 1.65;
}
.cn-determines {
  margin: auto -1.2rem -1.4rem;
  min-height: 3.1rem;
  padding: .45rem 1.2rem;
  background: #a8c4d8;
  color: var(--white);
  font-size: .62rem;
  font-weight: 800;
  letter-spacing: .12em;
  line-height: 1.45;
  text-transform: uppercase;
}
.cn.hl .cn-determines { color: var(--white); }
.cn-determines-empty {
  color: transparent;
}
.chain-footnote {
  display: block;
  width: 100%;
  margin: -2.15rem auto 0;
  padding: .45rem .9rem;
  border: 1px solid rgba(168,196,216,.75);
  background: rgba(255,255,255,.5);
  color: var(--navy);
  text-align: center;
  font-size: .7rem;
  letter-spacing: .09em;
  line-height: 1.45;
  font-weight: 800;
  text-transform: uppercase;
}

.gap-worth-heading {
  margin: 0 auto 1.4rem;
  color: var(--navy);
  text-align: center;
  font-size: clamp(1.45rem, 2.6vw, 2.35rem);
  font-weight: 900;
  letter-spacing: .12em;
  line-height: 1.15;
  text-transform: uppercase;
}

@keyframes markerDrop {
  0%, 100% { transform: rotate(180deg) translateY(0); opacity: .72; }
  50% { transform: rotate(180deg) translateY(-5px); opacity: 1; }
}

@keyframes markerRise {
  0%, 100% { transform: rotate(0deg) translateY(0); opacity: .72; }
  50% { transform: rotate(0deg) translateY(-5px); opacity: 1; }
}

@media (max-width: 1024px) {
  .chain-map {
    --chain-gap: 3rem;
  }
  .chain-map::before {
    display: none;
  }
  .chain-marker-start {
    grid-column: 1 / 4;
    grid-row: 1;
  }
  .chain-node-1 {
    grid-column: 1;
    grid-row: 2;
  }
  .chain-node-2 {
    grid-column: 3;
    grid-row: 2;
  }
  .chain-node-3 {
    grid-column: 5;
    grid-row: 2;
  }
  .chain-node-4 {
    grid-column: 7;
    grid-row: 2;
  }
  .chain-dependent {
    grid-column: 1 / 8;
    grid-row: 3;
    margin-top: 0;
  }
  .chain-marker-end {
    grid-column: 5 / 8;
    grid-row: 1;
    justify-self: end;
    text-align: right;
  }
  .chain-marker-end::after {
    top: auto;
    bottom: .05rem;
    animation-name: markerDrop;
  }
}

/* ===================== PHILOSOPHY ===================== */
.wif-stack { display: flex; flex-direction: column; gap: 3px; }
.wif-card {
  background: var(--panel); border: 1px solid var(--g3); padding: 1.4rem 1.6rem;
  position: relative; overflow: hidden;
}
.wif-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--lime); transform: scaleY(0); transform-origin: top; transition: transform .3s;
}
.wif-card:hover::before { transform: scaleY(1); }
.wif-q { font-size: .75rem; letter-spacing: .2em; text-transform: uppercase; color: var(--teal); margin-bottom: .5rem; font-weight: 700; }
.wif-txt { font-size: 1rem; font-style: italic; font-weight: 300; color: var(--white); line-height: 1.6; }

/* ===================== STATS ROW ===================== */
.stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; margin-top: 3rem; }
.stat-box { background: var(--void2); border: 1px solid var(--g3); padding: 2rem 1.5rem; text-align: center; }
.stat-num { display: block; font-size: 2.4rem; font-weight: 800; color: var(--teal); line-height: 1; }
.stat-lbl { display: block; font-size: .75rem; letter-spacing: .14em; color: var(--g1); margin-top: .5rem; font-weight: 600; text-transform: uppercase; }
.capability-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr);
  gap: 3.5rem;
  align-items: start;
}
.capability-copy {
  max-width: 640px;
}
.capability-stats {
  grid-template-columns: 1fr;
  margin-top: .25rem;
}
.capability-stats .stat-box {
  padding: 1.7rem 1.5rem;
}
.capability-close {
  max-width: none;
  margin: 3rem 0 0;
  padding: 2.4rem 1rem;
  border-top: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
  color: var(--white);
  font-size: clamp(1.55rem, 3vw, 2.7rem);
  font-style: italic;
  font-weight: 300;
  line-height: 1.45;
  text-align: center;
}
.capability-close strong {
  color: var(--teal);
  font-style: normal;
  font-weight: 800;
}

/* ===================== PROOF CARDS ===================== */
.proof-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px; margin-top: 3rem; }
.proof-card { background: var(--panel); border: 1px solid var(--g3); padding: 2rem 2rem 2.4rem; transition: background .2s; }
.proof-card:hover { background: var(--bdr); }
.pc-sector { font-size: .72rem; letter-spacing: .2em; text-transform: uppercase; color: var(--teal); margin-bottom: .8rem; display: flex; align-items: center; gap: .6rem; font-weight: 700; }
.pc-sector::before { content: ''; display: block; width: 1.5rem; height: 2px; background: var(--teal); }
.pc-client { font-size: 1.1rem; font-weight: 700; color: var(--white); margin-bottom: 1.2rem; }
.pc-row { display: flex; align-items: baseline; gap: .75rem; margin-bottom: .5rem; }
.pc-num { font-size: 1.6rem; font-weight: 800; color: var(--teal); white-space: nowrap; }
.pc-lbl { font-size: .9rem; color: var(--g1); font-weight: 300; }
.pc-status { margin-top: 1.3rem; display: flex; align-items: center; gap: .5rem; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--lime); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.3} }
.status-lbl { font-size: .72rem; letter-spacing: .16em; text-transform: uppercase; color: var(--lime); font-weight: 700; }

/* ===================== WHAT WE DO ===================== */
.what-do-grid {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 2px; margin-top: 2.5rem; text-align: left;
}
.what-do-card {
  min-width: 0;
  background: #fff; border: 1px solid #c8dce8; border-top: 3px solid var(--teal);
  padding: 1.8rem;
}
.what-do-kicker {
  font-size: .78rem; letter-spacing: .2em; text-transform: uppercase;
  color: var(--teal); font-weight: 700; margin-bottom: .7rem;
}
.what-do-title {
  font-size: 1.05rem; font-weight: 700; color: #0d1520; margin-bottom: .5rem;
}
.what-do-card p { color: #2a3a4a; font-size: .95rem; }