/* ==========================================================
   Rightlander Engine — 5-stage diagram
   Used on homepage + /solutions/ecommerce.html
   ========================================================== */

.engine-section {
  padding: clamp(72px, 9vw, 120px) 0;
  background:
    radial-gradient(900px 500px at 15% 100%, rgba(14, 109, 255, .10), transparent 60%),
    radial-gradient(900px 500px at 85% 0%, rgba(75, 212, 255, .08), transparent 60%),
    var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.engine-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto clamp(48px, 6vw, 72px);
}
.engine-header .eyebrow { margin-bottom: 14px; }
.engine-header h2 {
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin: 0 0 18px;
  font-weight: 700;
}
.engine-header p {
  color: var(--color-ink-2);
  font-size: clamp(16px, 1.2vw, 18px);
  line-height: 1.6;
  margin: 0;
}

/* ---------- The diagram itself ---------- */
.engine-diagram {
  max-width: 1180px;
  margin: 0 auto;
  position: relative;
}

.engine-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  grid-template-rows: auto auto auto auto auto;
  gap: 24px 40px;
  align-items: center;
}

/* Stage pill — the 5 main nodes */
.stage {
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  border-radius: 14px;
  padding: 20px 22px;
  box-shadow: 0 1px 0 rgba(15, 23, 42, .04), 0 10px 30px -18px rgba(15, 23, 42, .18);
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.stage:hover {
  transform: translateY(-2px);
  box-shadow: 0 1px 0 rgba(15, 23, 42, .04), 0 18px 40px -18px rgba(14, 109, 255, .3);
  border-color: rgba(14, 109, 255, .4);
}
.stage .stage-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: .04em;
  display: flex;
  align-items: center;
  gap: 6px;
}
.stage .stage-num .money {
  color: var(--color-accent);
  font-size: 14px;
}
.stage h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0;
  letter-spacing: -0.01em;
}
.stage p {
  font-size: 14px;
  color: var(--color-ink-2);
  margin: 0;
  line-height: 1.5;
}
.stage.is-revenue {
  background: linear-gradient(135deg, rgba(14, 109, 255, .06), rgba(75, 212, 255, .04));
  border-color: rgba(14, 109, 255, .3);
}
[data-theme="dark"] .stage.is-revenue {
  background: linear-gradient(135deg, rgba(14, 109, 255, .15), rgba(75, 212, 255, .08));
  border-color: rgba(14, 109, 255, .45);
}

/* Signal chips — the side nodes (Retailer Links, Brand Mentions, etc.) */
.signal {
  background: var(--color-surface);
  border: 1px solid var(--color-accent);
  border-left-width: 3px;
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.signal .signal-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink);
}
.signal .signal-sub {
  font-size: 12px;
  color: var(--color-ink-3);
}
.signal-stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Grid placement (desktop) */
.engine-grid {
  grid-template-areas:
    ".         stage-1   ."
    "signals-l stage-2   signals-r-1"
    "signals-l stage-2   signals-r-2"
    "signals-l stage-2   signals-r-3"
    "stage-3   stage-4   stage-5";
}
.engine-grid .slot-signals-l { grid-area: signals-l; align-self: center; }
.engine-grid .slot-signals-r-1 { grid-area: signals-r-1; align-self: start; }
.engine-grid .slot-signals-r-2 { grid-area: signals-r-2; align-self: center; }
.engine-grid .slot-signals-r-3 { grid-area: signals-r-3; align-self: end; }
.engine-grid .slot-1 { grid-area: stage-1; }
.engine-grid .slot-2 { grid-area: stage-2; }
.engine-grid .slot-3 { grid-area: stage-3; }
.engine-grid .slot-4 { grid-area: stage-4; }
.engine-grid .slot-5 { grid-area: stage-5; }

/* Connector lines via SVG overlay */
.engine-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.engine-lines line,
.engine-lines path {
  stroke: var(--color-divider);
  stroke-width: 1.5;
  fill: none;
}
.engine-lines .is-primary {
  stroke: var(--color-accent);
  stroke-width: 2;
}

/* Legend */
.engine-legend {
  margin: 40px auto 0;
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--color-ink-2);
}
.engine-legend .legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.engine-legend .legend-dot {
  width: 10px; height: 10px; border-radius: 50%;
}
.engine-legend .legend-dot.revenue { background: var(--color-accent); }
.engine-legend .legend-dot.signal { background: transparent; border: 2px solid var(--color-accent); }

/* Responsive — mobile stack */
@media (max-width: 860px) {
  .engine-grid {
    grid-template-columns: 1fr;
    grid-template-areas: none;
    gap: 12px;
  }
  .engine-grid .slot-1,
  .engine-grid .slot-2,
  .engine-grid .slot-3,
  .engine-grid .slot-4,
  .engine-grid .slot-5,
  .engine-grid .slot-signals-l,
  .engine-grid .slot-signals-r-1,
  .engine-grid .slot-signals-r-2,
  .engine-grid .slot-signals-r-3 {
    grid-area: auto;
  }
  .signal-stack {
    flex-direction: row;
    overflow-x: auto;
    gap: 10px;
    padding-bottom: 8px;
    scrollbar-width: thin;
  }
  .signal {
    flex: 0 0 auto;
    min-width: 180px;
  }
  .engine-lines { display: none; }
  /* Vertical connector between stacked stages */
  .stage + .stage,
  .signal-stack + .stage,
  .stage + .signal-stack {
    position: relative;
  }
  .stage + .stage::before,
  .signal-stack + .stage::before {
    content: "";
    position: absolute;
    top: -14px;
    left: 50%;
    width: 2px;
    height: 10px;
    background: var(--color-divider);
    transform: translateX(-50%);
  }
}