/* Coded stack diagram — uses each proposal's --accent, --surface, --mono, etc. */

.stack-diagram {
  position: relative;
  margin-top: 24px;
  padding: 36px 20px 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  overflow: hidden;
}

.stack-diagram::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 55% 45% at 50% 52%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%);
  pointer-events: none;
}

.stack-layers {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  max-width: 280px;
  position: relative;
  z-index: 1;
}

.stack-layer {
  width: 100%;
  position: relative;
}

/* corner anchors + spine */
.stack-layer::before,
.stack-layer::after {
  content: "";
  position: absolute;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 70%, var(--muted));
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  opacity: 0.85;
}
.stack-layer::before { left: -14px; }
.stack-layer::after { right: -14px; }

.stack-spine {
  position: absolute;
  left: 50%;
  top: 18%;
  bottom: 18%;
  width: 0;
  border-left: 1px dashed color-mix(in srgb, var(--accent) 45%, var(--border-strong));
  transform: translateX(-50%);
  z-index: 0;
  pointer-events: none;
}

.stack-plate {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 12px 18px;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  background: var(--surface-2);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.02em;
  text-transform: lowercase;
  box-shadow: 0 3px 0 var(--border);
}

.stack-glyph {
  font-size: 14px;
  color: var(--muted);
  line-height: 1;
  flex-shrink: 0;
}

.stack-glyph svg {
  display: block;
  width: 16px;
  height: 16px;
}

.stack-name {
  white-space: nowrap;
}

/* middle sandbox layer */
.stack-layer-sandbox {
  z-index: 2;
}

.stack-plate-sandbox {
  background: var(--bg);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border-strong));
  color: var(--accent);
  box-shadow:
    0 0 28px color-mix(in srgb, var(--accent) 28%, transparent),
    0 4px 0 color-mix(in srgb, var(--accent) 35%, var(--border));
}

.stack-plate-sandbox .stack-glyph {
  color: var(--accent);
}

.stack-plate-sandbox .stack-glyph svg {
  stroke: currentColor;
  fill: none;
}

/* connectors between layers */
.stack-connector {
  width: 0;
  height: 18px;
  margin: -4px auto;
  border-left: 1px dashed color-mix(in srgb, var(--accent) 40%, var(--muted-2, var(--muted)));
  opacity: 0.7;
  list-style: none;
}

@media (min-width: 720px) {
  .how-grid:has(.stack-diagram) {
    display: grid;
    grid-template-columns: 1fr min(300px, 42%);
    gap: 32px;
    align-items: start;
  }

  .how-grid:has(.stack-diagram) .stack-diagram {
    margin-top: 0;
  }
}