/* ==========================================================================
   MAVI — growth-engine.css
   The animated, interactive 6-step Growth Engine loop diagram (home page).
   ========================================================================== */

.engine {
  padding-block: clamp(56px, 8vw, 96px) clamp(80px, 10vw, 140px);
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

/* Ambient looping background video behind the diagram — blurred + dimmed so
   it reads as atmosphere, not content. */
.engine-bg-video {
  position: absolute;
  inset: -20px;
  width: calc(100% + 40px);
  height: calc(100% + 40px);
  object-fit: cover;
  filter: blur(7px);
  opacity: .32;
  z-index: 0;
  pointer-events: none;
}
.engine-bg-scrim {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    linear-gradient(180deg, var(--bg) 0%, rgba(7,11,20,.55) 18%, rgba(7,11,20,.55) 82%, var(--bg) 100%),
    radial-gradient(70% 60% at 50% 45%, transparent 0%, rgba(7,11,20,.5) 100%);
}
.engine > .wrap { position: relative; z-index: 1; }
@media (prefers-reduced-motion: reduce) {
  .engine-bg-video { opacity: .2; }
}

.engine-head { max-width: 680px; margin-bottom: clamp(36px, 5vw, 56px); }
.engine-head-title {
  margin-top: 14px;
  color: var(--fg);
}
.engine-head .lede { margin-top: 16px; }

.engine-stage {
  display: flex;
  align-items: center;
  gap: clamp(24px, 4vw, 64px);
}

.engine-circle-wrap {
  position: relative;
  flex: 0 0 auto;
  width: min(560px, 88vw);
  aspect-ratio: 1 / 1;
  margin-inline: auto;
  padding: 54px;
}

.engine-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}
.engine-track {
  fill: none;
  stroke: var(--border);
  stroke-width: 1.5;
}
.engine-progress {
  fill: none;
  stroke: var(--accent-bright);
  stroke-width: 2.25;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 300px 300px;
  filter: drop-shadow(0 0 6px rgba(79,179,255,.55));
}
.engine-dot {
  fill: var(--accent-bright);
  filter: drop-shadow(0 0 8px rgba(79,179,255,.9));
  opacity: 0;
  transition: opacity .4s var(--ease-out);
}
.engine-dot.is-live { opacity: 1; }

.engine-center {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 40%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}
.engine-center-mark { width: 84px; height: 84px; }
.engine-center-mark img { width: 100%; height: 100%; object-fit: contain; display: block; }
.engine-center-label {
  font-family: var(--font-display);
  font-size: 14px;
  line-height: 1.35;
  color: var(--muted);
  letter-spacing: .01em;
}

.engine-node {
  position: absolute;
  top: var(--y);
  left: var(--x);
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  z-index: 3;
}
.engine-node--upper { flex-direction: column-reverse; }

.engine-node-dot {
  width: 58px; height: 58px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border-bright);
  color: var(--muted);
  transition: transform .35s var(--ease-out), border-color .35s var(--ease-out), color .35s var(--ease-out), background-color .35s var(--ease-out), box-shadow .35s var(--ease-out);
}
.engine-node-dot svg { width: 24px; height: 24px; }
.engine-node-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--muted-2);
  white-space: nowrap;
  transition: color .3s var(--ease-out);
}

.engine-node.is-passed .engine-node-dot {
  border-color: var(--accent);
  color: var(--accent-bright);
}
.engine-node.is-active .engine-node-dot,
.engine-node:hover .engine-node-dot,
.engine-node:focus-visible .engine-node-dot {
  background: linear-gradient(160deg, rgba(47,111,237,.35), rgba(79,179,255,.1));
  border-color: var(--accent-bright);
  color: var(--fg);
  transform: scale(1.12);
  box-shadow: 0 0 0 6px rgba(79,179,255,.1), 0 0 24px rgba(79,179,255,.45);
}
.engine-node.is-active .engine-node-label,
.engine-node:hover .engine-node-label,
.engine-node:focus-visible .engine-node-label {
  color: var(--fg);
}

.engine-panel {
  flex: 1 1 340px;
  min-width: 0;
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}
.engine-panel-top { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.engine-panel-num {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--bg);
  background: var(--accent-bright);
  width: 30px; height: 30px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.engine-panel-sub { font-size: 12.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted-2); }
.engine-panel-title { color: var(--fg); margin-bottom: 12px; }
.engine-panel-desc { color: var(--muted); font-size: 15px; line-height: 1.65; min-height: 4.9em; }
.engine-panel-link {
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

@media (max-width: 980px) {
  .engine-stage { flex-direction: column; }
  .engine-circle-wrap { padding: 40px; }
  .engine-node-dot { width: 50px; height: 50px; }
  .engine-node-dot svg { width: 20px; height: 20px; }
  .engine-node-label { font-size: 11.5px; }
  .engine-panel { width: 100%; }
}
@media (max-width: 480px) {
  .engine-node-label { display: none; }
}