.lineas {
  background: var(--white);
  position: relative;
}

.lineas-tab-nav {
  display: flex;
  gap: 4px;
  background: var(--black);
  border-radius: var(--radius);
  padding: 4px;
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto 40px;
}
.lineas-tab-btn {
  flex: 1;
  padding: 14px 20px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--silver-light);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  text-align: center;
  letter-spacing: 0.3px;
}
.lineas-tab-btn:hover {
  color: var(--amber);
  background: rgba(198,40,40,0.08);
}
.lineas-tab-btn.active {
  background: var(--graphite);
  color: var(--gray-light);
  font-weight: 700;
  box-shadow: inset 0 -3px 0 var(--red-metallic);
}

.lineas-tab-panels {
  position: relative;
  z-index: 1;
}
.lineas-tab-panel {
  display: none;
  animation: fadeInTab 0.4s ease;
}
.lineas-tab-panel.active {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: stretch;
}
.lineas-tab-panel--full.active {
  display: block;
}

@keyframes fadeInTab {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.lineas-tab-left {
  display: flex;
  flex-direction: column;
  position: relative;
  background-image: url('../assets/images/gallery/collage-equipos-seguridad.webp');
  background-size: cover;
  background-position: center;
  border-radius: var(--radius);
  padding: 40px;
  min-height: 360px;
  overflow: hidden;
  justify-content: center;
}
.lineas-tab-left::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 0;
}
.lineas-tab-left > * {
  position: relative;
  z-index: 1;
}
.lineas-tab-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--gradient-red);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 1.8rem;
  color: var(--white);
}
.lineas-tab-left h3 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
  line-height: 1.3;
}
.lineas-tab-left p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
  margin-bottom: 24px;
}
.lineas-tab-left .btn {
  align-self: flex-start;
}

.lineas-tab-full {
  position: relative;
  background-size: 100%;
  background-position: center;
  border-radius: var(--radius);
  padding: 60px 48px;
  height: 60vh;
  min-height: 380px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
#tab-seguridad .lineas-tab-full {
  background-image: url('../assets/images/gallery/collage-equipos-seguridad.webp');
}
#tab-metal .lineas-tab-full {
  background-image: url('../assets/images/gallery/collage-soluciones-metalmecanicas.webp');
}
#tab-acero .lineas-tab-full {
  background-image: url('../assets/images/gallery/cristal_blindado_cuarto_operacion.webp');
}

.lineas-tab-full::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 0;
}
.lineas-tab-full > * {
  position: relative;
  z-index: 1;
  max-width: 640px;
}
.lineas-tab-full h3 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 20px;
}
.lineas-tab-full p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.75);
  line-height: 1.8;
  margin-bottom: 28px;
}
.lineas-tab-full p strong {
  color: var(--white);
  font-weight: 600;
}
.lineas-tab-full .btn {
  align-self: flex-start;
}

.lineas-tab-right {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  position: relative;
  border-radius: var(--radius);
  padding: 16px;
  min-height: 280px;
  overflow: hidden;
}
.lineas-chip {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 10px;
  padding: 16px;
  transition: all var(--transition);
  cursor: default;
  position: relative;
  z-index: 1;
}
.lineas-chip:hover {
  background: rgba(255,255,255,0.96);
  border-color: var(--red-metallic);
  box-shadow: 0 4px 20px rgba(198,40,40,0.2);
}
.lineas-chip-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(198,40,40,0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--red-metallic);
  flex-shrink: 0;
}
.lineas-chip span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--graphite);
  line-height: 1.3;
}

@media (max-width: 768px) {
  .lineas-tab-nav {
    flex-direction: column;
    gap: 4px;
    max-width: 100%;
  }
  .lineas-tab-panel.active {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .lineas-tab-right {
    grid-template-columns: 1fr 1fr;
  }
  .lineas-tab-left h3 {
    font-size: 1.35rem;
  }
  .lineas-tab-full {
    padding: 40px 28px;
    height: 50vh;
    min-height: 280px;
    background-size: 160%;
  }
  .lineas-tab-full h3 {
    font-size: 1.5rem;
  }
  .lineas-tab-full p {
    font-size: 0.95rem;
  }
}

@media (max-width: 480px) {
  .lineas-tab-right {
    grid-template-columns: 1fr;
  }
}