/* ==================== RESPONSIVE DESIGN ==================== */

/* Large screens (default) — no changes needed */

/* Medium screens: collapse right sidebar */
@media (max-width: 1200px) {
  :root { --sb-w: 240px }
  .stage-bar-l .si:first-child { display: none }
}

/* Tablet / small laptop */
@media (max-width: 1024px) {
  :root { --sb-w: 220px }
  .ms { width: 800px; height: 500px }
  .lay-grid { grid-template-columns: repeat(3, 1fr) }
  .bg-grid { grid-template-columns: repeat(5, 1fr) }
}

/* Below 900px: hide right sidebar, make left sidebar overlay-able */
@media (max-width: 900px) {
  body { flex-direction: column; position: relative }
  
  .sb.left {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 200;
    transform: translateX(-100%);
    transition: transform .3s cubic-bezier(.4,0,.2,1);
    border-right: 1px solid var(--border);
    flex-direction: row;
  }
  .sb.left.open { transform: translateX(0) }
  .sb-panel { width: 220px; min-width: 220px }
  
  .sb.right {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    z-index: 200;
    transform: translateX(100%);
    transition: transform .3s cubic-bezier(.4,0,.2,1);
    border-left: 1px solid var(--border);
    width: 270px;
    min-width: 270px;
  }
  .sb.right.open { transform: translateX(0) }
  
  .stage-wrap { width: 100%; flex: 1 }
  
  /* Mobile sidebar overlay backdrop */
  .sb-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 199;
  }
  .sb-overlay.show { display: block }
  
  /* Mobile toolbar buttons to open sidebars */
  .mobile-toggle {
    display: flex !important;
    width: 28px;
    height: 28px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 5px;
    color: var(--dim);
    cursor: pointer;
    font-size: 12px;
    align-items: center;
    justify-content: center;
    transition: all .15s;
  }
  .mobile-toggle:hover { border-color: var(--accent); color: var(--text) }
  
  .ms { width: 700px; height: 438px }
}

/* Phone */
@media (max-width: 600px) {
  .stage-bar { padding: 0 6px; height: 34px; min-height: 34px }
  .stage-bar-l { gap: 4px }
  .stage-bar-r { gap: 2px }
  .zd { font-size: 8px; padding: 2px 4px }
  .zb { width: 20px; height: 20px; font-size: 10px }
  
  .ms { width: 500px; height: 312px }
  
  .sb.left, .sb.right { width: 100%; min-width: 100% }
  
  .lay-grid { grid-template-columns: repeat(3, 1fr) }
  .bg-grid { grid-template-columns: repeat(6, 1fr) }
  .theme-grid { grid-template-columns: repeat(3, 1fr) }
  .tpl-grid { grid-template-columns: 1fr }
}

/* Utility: hidden by default, shown via JS on mobile */
.mobile-toggle { display: none }