/* ── Operating Signal ribbon ─────────────────────── */
#signal {
  background: var(--color-hero-bg);
  padding: 96px 0;
}

.signal-header {
  margin-bottom: 56px;
}

.signal-header .section-pill {
  color: #fff;
  border-color: rgba(255,255,255,0.55);
}

.signal-header .section-title {
  color: #FFFFFF;
}

.signal-header .section-intro {
  color: rgba(255,255,255,0.80);
  margin-top: 14px;
}

/* ── 2x2 grid: white cards on dark bg ──────────── */
.signal-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.signal-block {
  background: #FFFFFF;
  border: 1.5px solid #FFFFFF;
  padding: 40px 36px;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease), box-shadow var(--transition);
}

.signal-block:hover {
  box-shadow: 0 8px 32px rgba(5,13,31,0.18);
}

.signal-block.visible {
  opacity: 1;
  transform: none;
}

.signal-block:nth-child(1) { transition-delay: 0s; }
.signal-block:nth-child(2) { transition-delay: 0.10s; }
.signal-block:nth-child(3) { transition-delay: 0.20s; }
.signal-block:nth-child(4) { transition-delay: 0.30s; }

.signal-accent-bar {
  width: 28px;
  height: 3px;
  background: var(--color-accent);
  margin-bottom: 20px;
}

.signal-headline {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.025em;
  line-height: 1.32;
  margin-bottom: 14px;
}

.signal-desc {
  font-size: 14px;
  color: var(--color-ink-secondary);
  line-height: 1.75;
  margin-bottom: 22px;
  font-weight: 400;
}

.signal-quote {
  font-size: 13px;
  font-style: italic;
  color: var(--color-ink-secondary);
  line-height: 1.65;
  padding-left: 14px;
  border-left: 2px solid var(--color-accent);
  opacity: 0.75;
}

/* ── Closing punchline ───────────────────────────── */
.signal-closer {
  margin-top: 52px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.12);
  text-align: center;
}

.signal-closer-text {
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  color: rgba(255,255,255,0.90);
  letter-spacing: -0.03em;
  line-height: 1.4;
  max-width: 700px;
  margin: 0 auto;
}

.signal-closer-sub {
  font-size: 12px;
  font-weight: 500;
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 14px;
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 860px) {
  .signal-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .signal-block { padding: 32px 24px; }
}


/* ── Contact: identity declaration ──────────────── */
#contact {
  background: var(--color-bg);
  padding: 104px 0;
  border-top: 1px solid var(--color-border);
}

.contact-inner {
  max-width: none;
}

.contact-statement {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: -0.04em;
  line-height: 1.14;
  margin-bottom: 24px;
  max-width: none;
}

.contact-statement em {
  font-style: normal;
  color: var(--color-accent);
}

.contact-sub {
  font-size: 17px;
  color: var(--color-ink-secondary);
  line-height: 1.78;
  margin-bottom: 44px;
  max-width: none;
  font-weight: 400;
}

.contact-cta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}