/* ==========================================================
   Void Messenger — Feature Sections
   ========================================================== */

/* ── Section Base ── */
.feature-section {
  padding: var(--section-padding-y) 0;
}

.feature-section .container {
  max-width: var(--content-max-width);
}

/* ── Identity Section ── */
#identity .section-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.entropy-ring {
  width: clamp(160px, 20vw, 220px);
  height: clamp(160px, 20vw, 220px);
}

.entropy-ring__circle {
  fill: none;
  stroke: #FF2D78;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transform: rotate(-90deg);
  transform-origin: center;
  transform-box: fill-box;
  animation: ring-loop 6s ease-in-out infinite;
}

.entropy-ring__track {
  fill: none;
  stroke: var(--void-outline);
  stroke-width: 1.5;
}

/* ── Decay Section ── */
#decay .section-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.decay-demo {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: clamp(240px, 80%, 320px);
}

.decay-bubble {
  background: var(--void-surface-variant);
  border: 1px solid var(--void-outline);
  border-radius: var(--radius-md) var(--radius-md) var(--radius-md) var(--radius-xs);
  padding: 12px 16px;
  font-size: 0.9rem;
  color: var(--text-primary);
  animation: message-decay 8s ease-in-out infinite;
  position: relative;
}

.decay-bubble--partner {
  border-radius: var(--radius-md) var(--radius-md) var(--radius-xs) var(--radius-md);
  align-self: flex-end;
}

.decay-bubble__ember-label {
  position: absolute;
  bottom: -28px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--ember-gold);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 600;
  opacity: 0;
  animation: ember-label 8s ease-in-out infinite;
}

@keyframes ember-label {
  0%, 55% { opacity: 0; }
  65%, 90% { opacity: 1; }
  100% { opacity: 0; }
}

/* ── Trust Section ── */
#trust .section-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.trust-diagram {
  width: 100%;
  max-width: 450px;
  height: auto;
}

.trust-diagram__flow-line {
  stroke-dasharray: 12 6;
  animation: data-flow 2s linear infinite;
}

.trust-diagram__flow-line--reverse {
  stroke-dasharray: 12 6;
  animation: data-flow-reverse 2s linear infinite;
}

.trust-diagram__node-label {
  font-family: var(--font-family);
  font-size: 11px;
  fill: var(--text-secondary);
  text-anchor: middle;
}

.trust-diagram__node-glow {
  filter: drop-shadow(0 0 8px rgba(255, 45, 120, 0.4));
}

.trust-diagram__server-icon {
  fill: var(--text-tertiary);
}

/* ── Transparency Section ── */
#transparency {
  text-align: center;
}

#transparency .section-headline {
  margin-bottom: 3rem;
}

.transparency-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 700px;
  margin: 0 auto;
}

.transparency-card {
  background: var(--void-surface-variant);
  border: 1px solid var(--void-outline);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 3vw, 36px);
  text-align: left;
  transition: border-color var(--transition-normal),
              box-shadow var(--transition-normal),
              transform var(--transition-fast);
}

.transparency-card:hover {
  border-color: rgba(255, 45, 120, 0.3);
  box-shadow: 0 0 30px rgba(255, 45, 120, 0.08);
  transform: translateY(-2px);
}

.transparency-card__title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.transparency-card__text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Mobile ── */
@media (max-width: 768px) {
  .two-col .section-visual {
    order: -1;
  }

  .transparency-grid {
    grid-template-columns: 1fr;
  }

  .decay-demo {
    width: 100%;
  }
}