/* ─────────────────────────────────────────────────────────────
 * Architecture section — three-layer pipeline, principle cards
 * ───────────────────────────────────────────────────────────── */

/* Code layer blocks: equal height on desktop */
@media (min-width: 1024px) {
  .arch-pipeline {
    align-items: stretch;
  }
  .arch-layer {
    display: flex;
    flex-direction: column;
  }
  .arch-layer-code {
    flex: 1;
  }
}

/* Principle cards — per-card accent borders */
.pc-indigo { border-color: rgba(99, 102, 241, 0.4); }
.pc-indigo:hover { border-color: rgba(99, 102, 241, 0.8); }

.pc-sky { border-color: rgba(56, 189, 248, 0.4); }
.pc-sky:hover { border-color: rgba(56, 189, 248, 0.8); }

.pc-green { border-color: rgba(74, 222, 128, 0.4); }
.pc-green:hover { border-color: rgba(74, 222, 128, 0.8); }

.pc-amber { border-color: rgba(251, 191, 36, 0.4); }
.pc-amber:hover { border-color: rgba(251, 191, 36, 0.8); }

/* Principle card icon — spin/scale on hover */
.pc-icon {
  transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1),
              background 0.2s ease,
              border-color 0.2s ease;
}
.group:hover .pc-icon {
  transform: scale(1.15) rotate(8deg);
}

/* Principle card — active press feedback */
.group.principle-card:active {
  transform: scale(0.98);
  transition: transform 100ms ease-out;
}

/* Code panel window dot glow — staggered on hover */
.code-dot {
  transition: box-shadow 0.15s ease-out;
}
.code-panel pre {
  margin: 0;
}
.code-panel:hover .code-dot-close {
  box-shadow: 0 0 6px rgba(255, 95, 87, 0.8);
  transition-delay: 0ms;
}
.code-panel:hover .code-dot-minimize {
  box-shadow: 0 0 6px rgba(254, 188, 46, 0.8);
  transition-delay: 40ms;
}
.code-panel:hover .code-dot-maximize {
  box-shadow: 0 0 6px rgba(40, 200, 64, 0.8);
  transition-delay: 80ms;
}