/* ── Store + Calculator Split Layout ── */
    .store-shell {
      display: flex;
      flex: 1;
      overflow: hidden;
      height: calc(100vh - 52px);
    }

    /* Left: catalog */
    .store-catalog {
      flex: 1;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
    }

    /* Right: Calculator panel — always visible, never replaces catalog */
    .calc-panel {
      width: 380px;
      flex-shrink: 0;
      border-left: 1px solid var(--border);
      background: var(--bg2);
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }

    .calc-panel-header {
      padding: 1rem 1.25rem .75rem;
      border-bottom: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-shrink: 0;
      background: var(--accent-dim);
    }
    .calc-panel-title {
      display: flex;
      align-items: center;
      gap: .55rem;
      font-size: .9rem;
      font-weight: 700;
      color: var(--text);
      letter-spacing: -.01em;
    }
    .calc-panel-title svg { color: var(--accent); flex-shrink: 0; }
    .calc-panel-sub {
      font-size: .7rem;
      color: var(--muted);
      margin-top: 2px;
    }

    .calc-panel-body {
      flex: 1;
      overflow-y: auto;
      padding: 1rem 1.1rem;
      display: flex;
      flex-direction: column;
      gap: .65rem;
    }

    .calc-panel-footer {
      padding: .85rem 1.1rem;
      border-top: 1px solid var(--border);
      background: var(--accent-dim);
      flex-shrink: 0;
    }

    /* Override calc-shell styles for the panel */
    .calc-panel .calc-step {
      background: var(--bg3);
      border-radius: 8px;
      padding: .85rem .9rem;
      margin-bottom: 0;
    }

    .calc-panel .calc-step-header {
      margin-bottom: .65rem;
    }

    .calc-panel .calc-step-num {
      width: 22px;
      height: 22px;
      font-size: .72rem;
    }

    .calc-panel .calc-step-label {
      font-size: .78rem;
    }

    .calc-panel .calc-recommend {
      font-size: .65rem;
    }

    .calc-panel .calc-row-group {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: .65rem;
    }

    .calc-panel .calc-vps-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: .4rem;
    }

    .calc-panel .calc-vps-btn strong {
      font-size: .9rem;
    }

    .calc-panel .calc-vps-btn .calc-vps-spec {
      font-size: .58rem;
    }

    .calc-panel .calc-vps-btn em {
      font-size: .75rem;
    }

    .calc-panel .calc-llm-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: .4rem;
    }

    .calc-panel .calc-llm-head {
      font-size: .78rem;
    }

    .calc-panel .calc-llm-sub {
      font-size: .58rem;
    }

    .calc-panel .calc-addon-btn {
      font-size: .68rem;
      padding: .35rem .4rem;
    }

    .calc-panel .calc-profile-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: .4rem;
    }

    .calc-panel .calc-prof-btn {
      flex: unset;
      font-size: .73rem;
      padding: .4rem .5rem;
      min-width: unset;
    }

    .calc-total-display {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: .75rem;
    }

    .calc-total-label {
      font-size: .78rem;
      color: var(--muted);
      font-weight: 500;
    }

    .calc-total-value {
      font-size: 1.6rem;
      font-weight: 900;
      color: var(--text);
      letter-spacing: -.04em;
    }

    .calc-total-value sup {
      font-size: .85rem;
      font-weight: 600;
      vertical-align: super;
    }

    .calc-total-period {
      font-size: .75rem;
      color: var(--muted);
      font-weight: 400;
    }

    .calc-savings-strip {
      background: var(--accent-dim);
      border: 1px solid var(--border-hover);
      border-radius: 8px;
      padding: .55rem .8rem;
      margin-bottom: .75rem;
      font-size: .75rem;
      color: var(--accent2);
      font-weight: 600;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .calc-cta-btn {
      width: 100%;
      padding: .75rem;
      background: var(--accent);
      border: none;
      border-radius: 10px;
      color: #fff;
      font-family: inherit;
      font-size: .88rem;
      font-weight: 700;
      cursor: pointer;
      letter-spacing: -.01em;
      transition: all .2s;
      box-shadow: var(--shadow-accent);
    }

    .calc-cta-btn:hover {
      transform: translateY(-1px);
      filter: brightness(1.1);
    }

    @media (prefers-color-scheme: dark) {
      .calc-cta-btn {
        color: #000;
      }
    }

    .calc-trust-strip {
      display: flex;
      justify-content: center;
      gap: .65rem;
      font-size: .65rem;
      color: var(--muted);
      margin-top: .6rem;
      text-align: center;
    }

    .calc-compare-panel {
      background: var(--bg3);
      border-radius: 8px;
      padding: .65rem .8rem;
      margin-bottom: .65rem;
      display: flex;
      flex-direction: column;
      gap: .35rem;
    }
    .calc-compare-panel .calc-compare-row {
      display: flex;
      justify-content: space-between;
      font-size: .74rem;
    }
    .calc-compare-panel .calc-compare-label { color: var(--muted); }
    .calc-compare-panel .calc-compare-old {
      text-decoration: line-through;
      color: var(--muted);
      font-weight: 600;
    }
    .calc-compare-panel .calc-compare-new {
      color: var(--text);
      font-weight: 700;
    }
    .calc-compare-panel .calc-compare-save {
      color: var(--accent2);
      font-weight: 700;
      font-size: .74rem;
    }

    /* Responsive: stack on small screens */
    @media (max-width: 1100px) {
      .calc-panel { width: 320px; }
    }
    @media (max-width: 860px) {
      .store-shell { flex-direction: column; height: auto; }
      .calc-panel {
        width: 100%;
        border-left: none;
        border-top: 1px solid var(--border);
        max-height: 70vh;
      }
    }