.pk-bs__stage {
        margin-top: 4px;
        padding: 36px 16px;
        background:
            linear-gradient(135deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01)),
            repeating-conic-gradient(rgba(255,255,255,0.025) 0 25%, transparent 0 50%) 0 0/20px 20px;
        border: 1px solid rgba(255,255,255,0.08);
        border-radius: 12px;
        display: flex; align-items: center; justify-content: center;
        min-height: 240px;
    }
    .pk-bs__card {
        width: 300px; max-width: 100%; height: 180px;
        border-radius: 14px;
        background: #ffffff;
        color: #04102B;
        display: flex; align-items: center; justify-content: center;
        font-weight: 700; font-size: 1rem;
        letter-spacing: .02em;
    }
    .pk-bs__count {
        display: inline-block;
        padding: 1px 8px;
        background: rgba(255,255,255,0.10);
        border-radius: 999px;
        font-size: 0.75rem; font-weight: 700;
        margin-left: 6px;
        color: var(--pk-fg-mut);
    }
    .pk-bs__layers { display: flex; flex-direction: column; gap: 12px; margin-top: 4px; }
    .pk-bs__layer {
        padding: 12px;
        background: rgba(0,0,0,0.20);
        border: 1px solid rgba(255,255,255,0.08);
        border-radius: 12px;
    }
    .pk-bs__layer-head {
        display: flex; align-items: center; justify-content: space-between;
        gap: 8px; margin-bottom: 10px;
    }
    .pk-bs__layer-title {
        font-weight: 700; font-size: 0.85rem; color: var(--pk-fg);
        display: inline-flex; align-items: center; gap: 8px;
    }
    .pk-bs__layer-title .pk-bs__num {
        display: inline-flex; align-items: center; justify-content: center;
        width: 24px; height: 24px;
        background: linear-gradient(135deg, var(--calc-accent-2), var(--calc-accent));
        color: #04102B; border-radius: 50%;
        font-size: 0.75rem; font-weight: 800;
    }
    .pk-bs__layer-actions { display: flex; gap: 4px; }
    .pk-bs__icon-btn {
        appearance: none; cursor: pointer;
        width: 30px; height: 30px;
        background: rgba(255,255,255,0.06);
        border: 1px solid rgba(255,255,255,0.12);
        color: var(--pk-fg);
        border-radius: 6px; font-size: 0.78rem;
    }
    .pk-bs__icon-btn:hover:not(:disabled) { background: rgba(92,221,210,0.10); border-color: var(--calc-accent); }
    .pk-bs__icon-btn:disabled { opacity: 0.35; cursor: not-allowed; }
    .pk-bs__icon-btn--danger { color: #FF8C8C; }
    .pk-bs__icon-btn--danger:hover:not(:disabled) {
        background: rgba(255,107,107,0.10); border-color: #FF8C8C;
    }
    .pk-bs__grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    .pk-bs__cell { display: flex; flex-direction: column; gap: 6px; }
    .pk-bs__cell label {
        font-size: 0.75rem; color: var(--pk-fg-mut);
        text-transform: uppercase; letter-spacing: .04em; font-weight: 700;
    }
    .pk-bs__cell input[type="number"] {
        padding: 8px 10px;
        background: rgba(0,0,0,0.30) !important;
        border: 1.5px solid rgba(255,255,255,0.12) !important;
        color: var(--pk-fg) !important;
        border-radius: 8px;
        font-size: 0.9rem;
        font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    }
    .pk-bs__cell input[type="range"] { width: 100%; accent-color: var(--calc-accent); }
    .pk-bs__color-row {
        display: grid; grid-template-columns: 50px 1fr; gap: 8px; align-items: center;
    }
    .pk-bs__color-row input[type="color"] {
        width: 100%; height: 38px; padding: 2px;
        background: rgba(0,0,0,0.30);
        border: 1.5px solid rgba(255,255,255,0.12);
        border-radius: 8px; cursor: pointer;
    }
    .pk-bs__alpha-wrap { display: flex; flex-direction: column; gap: 4px; }
    .pk-bs__alpha-wrap small {
        font-size: 0.7rem; color: var(--pk-fg-mut); font-family: ui-monospace, monospace;
    }
    .pk-bs__inset-row {
        display: flex; align-items: center; gap: 10px; padding-top: 4px;
    }
    .pk-bs__inset-row label {
        display: inline-flex; align-items: center; gap: 8px;
        font-size: 0.85rem; cursor: pointer; color: var(--pk-fg);
    }
    .pk-bs__inset-row input[type="checkbox"] { accent-color: var(--calc-accent); width: 16px; height: 16px; }
    @media (max-width: 540px) {
        .pk-bs__grid { grid-template-columns: 1fr; }
    }
    .pk-bs__code {
        margin: 8px 0 0;
        padding: 14px 16px;
        background: rgba(0,0,0,0.40);
        border: 1px solid rgba(255,255,255,0.10);
        border-radius: 10px;
        color: var(--calc-accent);
        font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
        font-size: 0.85rem;
        overflow-x: auto;
        white-space: pre-wrap;
        word-break: break-all;
        text-align: left;
        line-height: 1.55;
    }
    .pk-bs__actions { display: flex; flex-wrap: wrap; gap: 8px; }
    .pk-btn {
        appearance: none; cursor: pointer;
        background: rgba(255,255,255,0.06);
        border: 1px solid rgba(255,255,255,0.12);
        color: var(--pk-fg);
        padding: 10px 16px;
        border-radius: 10px;
        font-weight: 700; font-size: 0.85rem;
        display: inline-flex; align-items: center; gap: 8px;
        transition: background .12s ease, border-color .12s ease;
    }
    .pk-btn--primary {
        background: linear-gradient(135deg, var(--calc-accent-2), var(--calc-accent));
        color: #04102B; border-color: transparent;
    }
    .pk-btn.is-copied { background: rgba(45,190,122,0.20); border-color: #2DBE7A; color: #2DBE7A; }
    @media (max-width: 600px) {
        .pk-bs__actions .pk-btn { flex: 1 1 auto; justify-content: center; }
    }