/*
 * LPVI — Symptom Engine v5
 * 06-engine.css
 */

/* ═══════════════════════════════════════════════════════
   SECTION WRAPPER
═══════════════════════════════════════════════════════ */

.engine-section {
  padding-top: var(--space-24);
  padding-bottom: var(--space-0);
  position: relative;
  overflow: hidden;
}

/* Atmospheric background — blobs drift slowly */
.engine-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 8% 65%,  rgba(107,191,154,0.14) 0%, transparent 50%),
    radial-gradient(ellipse at 92% 10%, rgba(120,161,187,0.18) 0%, transparent 48%),
    radial-gradient(ellipse at 50% 95%, rgba(26,43,60,0.07)    0%, transparent 40%),
    #F6FBFF;
  animation: engine-bg-drift 14s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes engine-bg-drift {
  0%   { transform: scale(1)    translate(0, 0); }
  50%  { transform: scale(1.03) translate(10px, -6px); }
  100% { transform: scale(1)    translate(-8px, 4px); }
}

.engine-section__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--section-pad-x);
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  z-index: 1;
}

/* ═══════════════════════════════════════════════════════
   INTRO BLOCK
═══════════════════════════════════════════════════════ */

.engine-section__intro {
  text-align: center;
  margin-bottom: var(--space-10);
  max-width: 640px;
}

.engine-section__eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-support);
  display: block;
  margin-bottom: var(--space-4);
}

.engine-section__heading {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: var(--weight-black);
  color: var(--color-text-primary);
  letter-spacing: -0.04em;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-5);
}

.engine-section__subheading {
  font-size: var(--text-md);
  color: var(--color-text-body);
  line-height: var(--leading-normal);
  max-width: 52ch;
  margin-inline: auto;
}

/* ═══════════════════════════════════════════════════════
   ENGINE CARD WRAPPER — bottom overlap
═══════════════════════════════════════════════════════ */

.engine-card-wrapper {
  width: 100%;
  max-width: 1100px;
  position: relative;
  z-index: var(--z-raised);
  margin-bottom: 0;
  padding-inline: var(--section-pad-x);
}

/* ═══════════════════════════════════════════════════════
   ENGINE CARD — light glassmorphic
═══════════════════════════════════════════════════════ */

.engine-card {
  width: 100%;
  background: rgba(255, 255, 255, 0.85);
  animation: engine-float 5s ease-in-out infinite;
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: 28px;
  box-shadow:
    0 4px 6px  rgba(0, 0, 0, 0.02),
    0 20px 60px rgba(0, 0, 0, 0.11),
    0 2px 0 rgba(255,255,255,0.95) inset;
  overflow: hidden;
  position: relative;
  transition: box-shadow var(--duration-slow) var(--ease-out);
}

.engine-card:hover {
  box-shadow:
    0 4px 6px  rgba(0, 0, 0, 0.02),
    0 28px 70px rgba(0, 0, 0, 0.11),
    0 2px 0 rgba(255,255,255,0.95) inset;
}

/* Top specular highlight */
.engine-card::before {
  content: '';
  position: absolute;
  top: 0; left: 8%; right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,1), transparent);
  pointer-events: none;
}

.engine-card__body {
  padding: var(--space-10) var(--space-12);
}

/* ═══════════════════════════════════════════════════════
   PROGRESS BAR — fluid vascular fill
═══════════════════════════════════════════════════════ */

.engine-progress {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}

.engine-progress__dot {
  height: 4px;
  flex: 1;
  border-radius: var(--radius-full);
  background: rgba(26, 43, 60, 0.10);
  overflow: hidden;
  position: relative;
}

.engine-progress__dot.is-done {
  background: rgba(107, 191, 154, 0.35);
}

.engine-progress__dot.is-active {
  background: rgba(26, 43, 60, 0.10);
}

.engine-progress__dot.is-active::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    var(--color-action) 0%,
    rgba(107, 191, 154, 0.80) 50%,
    var(--color-action) 100%
  );
  background-size: 200% 100%;
  animation: vascular-fill 2s ease-in-out infinite;
}

@keyframes vascular-fill {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ═══════════════════════════════════════════════════════
   STEP HEADER
═══════════════════════════════════════════════════════ */

.engine-step__eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-action-text);
  display: block;
  margin-bottom: var(--space-4);
}

.engine-step__heading {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: var(--weight-black);
  color: var(--color-navy);
  line-height: var(--leading-snug);
  letter-spacing: -0.03em;
  margin-bottom: var(--space-3);
  text-align: center;
  width: 100%;
}

.engine-step__guidance {
  font-size: var(--text-base);
  color: #2D3748;
  line-height: var(--leading-normal);
  margin-bottom: var(--space-8);
  max-width: 100%;
  text-align: center;
}

/* ═══════════════════════════════════════════════════════
   LEVEL 1 — GATEWAY CARDS (4 pillars)
═══════════════════════════════════════════════════════ */

.engine-gateways {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.engine-gateway {
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(107, 191, 154, 0.50);
  border-radius: 20px;
  padding: var(--space-6) var(--space-4);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-3);
  transition:
    transform    0.4s cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow   0.4s cubic-bezier(0.2, 0.8, 0.2, 1),
    background   0.3s var(--ease-out),
    border-color 0.3s var(--ease-out);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  overflow: hidden;
}

.engine-gateway::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at var(--click-x, 50%) var(--click-y, 50%),
    rgba(107, 191, 154, 0.22) 0%,
    transparent 70%
  );
  opacity: 0;
  transition: opacity 0.5s var(--ease-out);
}

.engine-gateway:hover {
  transform: translateY(-6px);
  background: var(--color-navy);
  border-color: var(--color-navy);
  color: white;
  box-shadow:
    0 12px 30px rgba(26, 43, 60, 0.25),
    0 4px 12px rgba(26, 43, 60, 0.15);
}

.engine-gateway:hover .gateway-svg {
  stroke: var(--color-action);
  stroke-width: 2.25;
  filter: drop-shadow(0 0 6px rgba(107, 191, 154, 0.70));
}

.engine-gateway.is-selected {
  background: var(--color-navy);
  border-color: var(--color-navy);
  color: white;
  transform: translateY(-4px);
  box-shadow:
    0 12px 30px rgba(26, 43, 60, 0.25),
    0 4px 10px rgba(26, 43, 60, 0.15);
}

.engine-gateway.is-selected::after {
  opacity: 1;
}

.engine-gateway__icon {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-bottom: var(--space-2);
}

.gateway-img {
  width: 160px;
  height: 160px;
  object-fit: contain;
  display: block;
  transition: filter 0.3s var(--ease-out);
}

.engine-gateway:hover .gateway-img,
.engine-gateway.is-selected .gateway-img {
  filter: brightness(0) invert(1);
}

.gateway-svg {
  width: 100%;
  height: 100%;
  stroke: #1A2B3C;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke 0.3s var(--ease-out), stroke-width 0.3s var(--ease-out);
}

.engine-gateway:hover .gateway-svg { stroke: var(--color-action); }
.engine-gateway.is-selected .gateway-svg { stroke: var(--color-action); }

.engine-gateway__title {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  color: var(--color-navy);
  line-height: 1.25;
  transition: color 0.3s var(--ease-out);
}

.engine-gateway:hover .engine-gateway__title { color: white; }
.engine-gateway.is-selected .engine-gateway__title { color: white; }

.engine-gateway__benefit {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: #2D3748;
  line-height: 1.5;
  transition: color 0.3s var(--ease-out);
}

.engine-gateway:hover .engine-gateway__benefit { color: rgba(255,255,255,0.88); }
.engine-gateway.is-selected .engine-gateway__benefit { color: rgba(255,255,255,0.88); }

/* ═══════════════════════════════════════════════════════
   LEVEL 2 — SPECIFIC TREATMENT CARDS
═══════════════════════════════════════════════════════ */

.engine-specifics {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
  overflow: hidden;
}

.engine-specific {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  background: var(--color-bg-white);
  border: 2px solid rgba(107, 191, 154, 0.50);
  border-radius: 18px;
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  transition:
    background    0.4s cubic-bezier(0.2, 0.8, 0.2, 1),
    border-color  0.3s var(--ease-out),
    transform     0.4s cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow    0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  text-align: left;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 2px 12px rgba(26, 43, 60, 0.06);
}

.engine-specific:hover {
  background: var(--color-navy);
  border-color: var(--color-navy);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(26, 43, 60, 0.25);
}

.engine-specific.is-selected {
  background: var(--color-navy);
  border-color: var(--color-navy);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(26, 43, 60, 0.25);
}

.engine-specific__dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(107, 191, 154, 0.40);
  border: 2px solid rgba(107, 191, 154, 0.70);
  flex-shrink: 0;
  transition: background 0.3s var(--ease-out), transform 0.3s var(--ease-bounce);
}

.engine-specific:hover .engine-specific__dot,
.engine-specific.is-selected .engine-specific__dot {
  background: var(--color-action);
  border-color: white;
  transform: scale(1.4);
}

.engine-specific__label {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  color: var(--color-navy);
  flex: 1;
  line-height: 1.3;
  transition: color 0.3s var(--ease-out);
}

.engine-specific:hover .engine-specific__label,
.engine-specific.is-selected .engine-specific__label { color: white; }

.engine-specific__sub {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  display: block;
  margin-top: 3px;
  font-weight: var(--weight-regular);
  transition: color 0.3s var(--ease-out);
}

.engine-specific:hover .engine-specific__sub,
.engine-specific.is-selected .engine-specific__sub { color: rgba(255,255,255,0.70); }

/* ═══════════════════════════════════════════════════════
   LEVELS 3-5 — DURATION, IMPACT & AGE CARDS
═══════════════════════════════════════════════════════ */

.engine-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.engine-option {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  background: var(--color-bg-white);
  border: 2px solid rgba(107, 191, 154, 0.50);
  border-radius: 18px;
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  transition:
    background    0.4s cubic-bezier(0.2, 0.8, 0.2, 1),
    border-color  0.3s var(--ease-out),
    transform     0.4s cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow    0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  text-align: left;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 2px 12px rgba(26, 43, 60, 0.06);
}

.engine-option:hover {
  background: var(--color-navy);
  border-color: var(--color-navy);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(26, 43, 60, 0.25);
}

.engine-option.is-selected {
  background: var(--color-navy);
  border-color: var(--color-navy);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(26, 43, 60, 0.25);
}

.engine-option__icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: rgba(107, 191, 154, 0.10);
  border: 1.5px solid rgba(107, 191, 154, 0.35);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: background 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}

.engine-option__icon svg {
  width: 18px; height: 18px;
  stroke: var(--color-action-text);
  transition: stroke 0.3s var(--ease-out);
}

.engine-option:hover .engine-option__icon,
.engine-option.is-selected .engine-option__icon {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.30);
}

.engine-option:hover .engine-option__icon svg,
.engine-option.is-selected .engine-option__icon svg { stroke: white; }

.engine-option__text { flex: 1; }

.engine-option__label {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  color: var(--color-navy);
  display: block;
  margin-bottom: 3px;
  transition: color 0.3s var(--ease-out);
}

.engine-option:hover .engine-option__label,
.engine-option.is-selected .engine-option__label { color: white; }

.engine-option__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.4;
  transition: color 0.3s var(--ease-out);
}

.engine-option:hover .engine-option__desc,
.engine-option.is-selected .engine-option__desc { color: rgba(255,255,255,0.70); }

/* ═══════════════════════════════════════════════════════
   CTA BUTTON
═══════════════════════════════════════════════════════ */

.engine-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--color-action-text);
  background: var(--color-action);
  border: none;
  border-radius: var(--radius-full);
  padding: var(--space-4) var(--space-8);
  cursor: pointer;
  transition:
    background  0.2s var(--ease-out),
    transform   0.2s var(--ease-out),
    box-shadow  0.3s var(--ease-out);
}

.engine-btn:hover {
  background: var(--color-action-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(107, 191, 154, 0.40);
}

.engine-btn:active { transform: scale(0.99); }

.engine-btn:disabled {
  opacity: 0.40;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.engine-btn svg {
  width: 16px; height: 16px;
  transition: transform 0.3s var(--ease-bounce);
}

.engine-btn:hover:not(:disabled) svg { transform: translateX(3px); }

.engine-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-bottom: var(--space-5);
  transition: color 0.2s var(--ease-out);
}
.engine-back:hover { color: var(--color-text-primary); }

/* ═══════════════════════════════════════════════════════
   LOADING
═══════════════════════════════════════════════════════ */

@keyframes shimmer {
  0%   { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    rgba(26, 43, 60, 0.05) 25%,
    rgba(26, 43, 60, 0.10) 50%,
    rgba(26, 43, 60, 0.05) 75%
  );
  background-size: 400px 100%;
  animation: shimmer 1.4s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.skeleton--text { height: 14px; margin-bottom: 8px; }
.skeleton--title { height: 28px; margin-bottom: 12px; width: 70%; }
.skeleton--block { height: 80px; }

.engine-processing {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  padding: var(--space-12) var(--space-4);
}

.engine-processing__pulse {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: rgba(107, 191, 154, 0.12);
  border: 2px solid rgba(107, 191, 154, 0.25);
  display: flex; align-items: center; justify-content: center;
  animation: pulse-ring 1.6s ease-in-out infinite;
}

@keyframes pulse-ring {
  0%, 100% { transform: scale(1);    box-shadow: 0 0 0 0 rgba(107,191,154,0.20); }
  50%       { transform: scale(1.08); box-shadow: 0 0 0 12px rgba(107,191,154,0); }
}

.engine-processing__pulse svg {
  width: 20px; height: 20px;
  stroke: var(--color-action);
}

.engine-processing__lines {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  text-align: center;
}

.engine-processing__line {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  opacity: 0;
  transform: translateY(6px);
  animation: line-appear 0.5s var(--ease-out) forwards;
}

.engine-processing__line:nth-child(1) { animation-delay: 0.2s; }
.engine-processing__line:nth-child(2) { animation-delay: 0.9s; }
.engine-processing__line:nth-child(3) { animation-delay: 1.6s; }

@keyframes line-appear {
  to { opacity: 1; transform: translateY(0); }
}

/* ═══════════════════════════════════════════════════════
   RESULT — THEATER EFFECT
═══════════════════════════════════════════════════════ */

.engine-card.is-result {
  background: var(--color-navy);
  border-color: rgba(120, 161, 187, 0.25);
  box-shadow:
    0 4px 6px  rgba(0,0,0,0.05),
    0 32px 80px rgba(0,0,0,0.30),
    0 2px 0 rgba(255,255,255,0.08) inset;
}

.engine-card.is-result::before {
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
}

.engine-result {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

.engine-result__finding {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.engine-result__label {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: rgba(255,255,255,0.40);
  display: block;
}

.engine-result__condition {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-black);
  color: white;
  line-height: var(--leading-snug);
  letter-spacing: -0.02em;
}

.engine-result__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-action);
  background: rgba(107,191,154,0.14);
  border: 0.5px solid rgba(107,191,154,0.35);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  align-self: flex-start;
}

.engine-result__badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-action);
}

.engine-result__description {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.68);
  line-height: var(--leading-normal);
  border-top: 0.5px solid rgba(255,255,255,0.08);
  padding-top: var(--space-4);
}

.engine-result__stats {
  display: flex;
  gap: var(--space-4);
  padding-top: var(--space-4);
  flex-wrap: wrap;
}

.engine-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.engine-stat__value {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-black);
  color: var(--color-action);
  line-height: 1;
}

.engine-stat__label {
  font-size: 10px;
  color: rgba(255,255,255,0.40);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.engine-result__action {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-6);
  background: rgba(255,255,255,0.05);
  border: 0.5px solid rgba(255,255,255,0.10);
  border-radius: var(--radius-lg);
}

.engine-result__action-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: rgba(255,255,255,0.40);
}

.engine-result__treatment {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.72);
  line-height: var(--leading-normal);
}

.engine-result__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--color-action-text);
  background: var(--color-action);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-full);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition:
    background   0.2s var(--ease-out),
    transform    0.2s var(--ease-out),
    box-shadow   0.3s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.engine-result__cta:hover {
  background: var(--color-action-hover);
  transform: translateY(-3px);
  box-shadow:
    0 10px 30px rgba(107,191,154,0.45),
    0 4px 12px rgba(107,191,154,0.30);
}

.engine-result__cta:active { transform: scale(0.99); }

.engine-result__verified {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 11px;
  color: rgba(255,255,255,0.35);
  justify-content: center;
}

.engine-result__verified svg {
  width: 12px; height: 12px;
  stroke: var(--color-action);
  opacity: 0.70;
}

.engine-result__restart {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.30);
  background: none;
  border: none;
  cursor: pointer;
  text-align: center;
  display: block;
  width: 100%;
  padding: var(--space-3) 0 0;
  transition: color 0.2s var(--ease-out);
}
.engine-result__restart:hover { color: rgba(255,255,255,0.60); }

/* ═══════════════════════════════════════════════════════
   DISCLAIMER
═══════════════════════════════════════════════════════ */

.engine-card__disclaimer {
  font-size: var(--text-xs);
  color: #718096;
  line-height: var(--leading-normal);
  font-style: italic;
  text-align: center;
  padding: var(--space-5) var(--space-12) var(--space-8);
  border-top: 1px solid rgba(26,43,60,0.08);
  background: rgba(26,43,60,0.02);
}

.engine-card.is-result .engine-card__disclaimer {
  color: rgba(255,255,255,0.25);
  border-top-color: rgba(255,255,255,0.06);
}

.engine-step { animation: step-in 0.4s var(--ease-out) both; }
@keyframes step-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes engine-float {
  0%   { transform: translateY(0px); }
  50%  { transform: translateY(-8px); }
  100% { transform: translateY(0px); }
}

/* ═══════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════ */

@media (max-width: 860px) {
  .engine-gateways { grid-template-columns: repeat(2, 1fr); }
  .engine-result { grid-template-columns: 1fr; gap: var(--space-6); }
}

@media (max-width: 640px) {
    .engine-section { padding-bottom: var(--space-16); }
  .engine-card-wrapper { margin-bottom: -56px; }
  .conditions-section { padding-top: calc(var(--space-16) + 56px); }
  .engine-card__body { padding: var(--space-6); }
  .engine-gateways { grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
  .engine-gateway { padding: var(--space-4) var(--space-3); }
  .engine-gateway__icon { width: 40px; height: 40px; }
  .engine-step__heading { font-size: var(--text-xl); }
  .engine-step__guidance { display: none; }
  .engine-card__disclaimer { padding: var(--space-4) var(--space-6); }
  .engine-result__stats { gap: var(--space-5); }
}

/* ═══════════════════════════════════════════════════════
   ABOUT STEP — Age + Gender (v5 addition)
═══════════════════════════════════════════════════════ */

.engine-about__age,
.engine-about__gender {
  margin-bottom: var(--space-6);
}

.engine-about__sublabel {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  text-align: center;
}

.engine-about__optional {
  font-weight: var(--weight-normal);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.engine-gender-row {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

.engine-gender-btn {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-body);
  background: var(--color-bg-white);
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-full);
  padding: var(--space-2-5) var(--space-6);
  cursor: pointer;
  min-height: 44px;
  transition:
    border-color var(--duration-fast) var(--ease-out),
    background   var(--duration-fast) var(--ease-out),
    color        var(--duration-fast) var(--ease-out);
}

.engine-gender-btn:hover {
  border-color: var(--color-action);
  color: var(--color-action-text);
}

.engine-gender-btn.is-selected {
  background: var(--color-action);
  border-color: var(--color-action);
  color: white;
  font-weight: var(--weight-semibold);
}