/* ============================================================
   ARDUINO & ESP32 — placa de circuito: negro, plateado, turquesa
   ============================================================ */
.esp32 {
  background-image:
    linear-gradient(90deg, rgba(184,194,201,0.05) 1px, transparent 1px),
    linear-gradient(0deg, rgba(184,194,201,0.05) 1px, transparent 1px);
  background-size: 36px 36px;
  color: var(--esp32-text);
  position: relative;
  overflow: hidden;
}

.esp32__title { color: var(--esp32-text); }
.esp32__eyebrow { color: var(--esp32-silver); }

.esp32__intro {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.esp32-board-badge {
  width: min(280px, 40%);
  filter: drop-shadow(0 25px 35px rgba(0,0,0,0.6));
  border-radius: 10px;
  flex-shrink: 0;
  transition: transform 0.05s linear;
  will-change: transform;
}
@media (max-width: 760px) {
  .esp32__intro { flex-direction: column; align-items: flex-start; }
  .esp32-board-badge { width: 70%; margin: 0 auto; }
}

.circuit-card {
  background: linear-gradient(155deg, #1a1c1f 0%, #0d0e10 55%, #15171a 100%);
  border: 1px solid rgba(184,194,201,0.28);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
}
.circuit-card::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 90px; height: 90px;
  background: radial-gradient(circle at top right, rgba(184,194,201,0.18), transparent 70%);
}
.circuit-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 40%, rgba(255,255,255,0.04) 50%, transparent 60%);
  pointer-events: none;
}
.circuit-card__video,
.circuit-card__video-placeholder {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  display: block;
  background: #08090a;
}
.circuit-card__video-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--esp32-turquoise);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-align: center;
  padding: 1rem;
  background:
    repeating-linear-gradient(135deg, #0c1011, #0c1011 10px, #0e1416 10px, #0e1416 20px);
}
.circuit-card__body { padding: 1.4rem 1.5rem 1.6rem; }
.circuit-card__title {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--esp32-text);
  margin: 0 0 0.5rem;
}
.circuit-card__desc {
  font-size: 0.92rem;
  color: var(--esp32-silver);
  line-height: 1.6;
}
.circuit-card .tech-pill-row { margin-top: 1rem; }
.circuit-card .tech-pill { border-color: rgba(184,194,201,0.35); color: var(--esp32-silver); }
.circuit-card .btn-demo { background: var(--esp32-silver); color: #0a0a0a; border-color: var(--esp32-silver); }
.circuit-card .btn-repo { color: var(--esp32-text); border-color: rgba(184,194,201,0.4); }
.circuit-card .btn-repo:hover { background: var(--esp32-text); color: #08090a; }

/* Bloque "riesgo" ESP32 (Jammer) dentro de Ciberseguridad usa este mismo acento */
.esp32-risk-note {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--esp32-turquoise);
  opacity: 0.85;
}