/* ---------------- Tool layout (specific to Gradient Studio) ---------------- */
  .app{
    display:grid;
    grid-template-columns:1fr 380px 300px;
    grid-template-areas:"stage panel ads";
    min-height:calc(100vh - var(--header-h));
  }
  @media (max-width:1320px){
    .app{
      grid-template-columns:1fr 380px;
      grid-template-areas:"stage panel" "ads ads";
    }
  }
  @media (max-width:960px){
    .app{
      grid-template-columns:1fr;
      grid-template-areas:"stage" "panel" "ads";
    }
  }
  .stage{ grid-area:stage; }
  .panel{ grid-area:panel; }
  .ad-rail{ grid-area:ads; }

  /* ---------------- Stage (live preview) ---------------- */
  .stage{
    position:relative;
    display:flex;
    align-items:flex-end;
    min-height:420px;
    overflow:hidden;
    border-right:1px solid var(--border-soft);
  }
  @media (max-width:960px){ .stage{border-right:none; border-bottom:1px solid var(--border-soft); min-height:60vh;} }

  #canvasPreview{
    position:absolute;
    inset:0;
    width:100%;
    height:100%;
  }
  .grain-layer{
    position:absolute;
    inset:0;
    pointer-events:none;
    mix-blend-mode:overlay;
    opacity:0;
    transition:opacity .15s ease;
  }

  .mesh-layer{
    position:absolute;
    inset:0;
    display:none;
  }
  .mesh-point{
    position:absolute;
    width:22px;height:22px;
    margin:-11px 0 0 -11px;
    border-radius:50%;
    border:2px solid rgba(255,255,255,0.9);
    box-shadow:0 0 0 1px rgba(0,0,0,.35), 0 2px 8px rgba(0,0,0,.4);
    cursor:grab;
    touch-action:none;
  }
  .mesh-point:active{cursor:grabbing;}
  .mesh-point.selected{outline:2px solid #fff;outline-offset:2px;}

  .stage-topbar{
    position:absolute;
    top:16px;left:16px;right:16px;
    display:flex;
    justify-content:space-between;
    align-items:flex-start;
    gap:12px;
    z-index:5;
  }
  .modetabs{
    display:flex;
    gap:2px;
    background:rgba(12,13,17,0.55);
    backdrop-filter:blur(10px);
    border:1px solid rgba(255,255,255,0.08);
    border-radius:10px;
    padding:3px;
  }
  .modetabs button{
    background:none;border:none;
    font-family:var(--mono);
    font-size:12px;
    color:rgba(242,242,239,0.6);
    padding:7px 12px;
    border-radius:7px;
    transition:background .15s, color .15s;
  }
  .modetabs button.active{
    background:rgba(255,255,255,0.12);
    color:#fff;
  }
  .stage-actions{
    display:flex;gap:8px;
  }
  .icon-btn{
    width:34px;height:34px;
    display:flex;align-items:center;justify-content:center;
    background:rgba(12,13,17,0.55);
    backdrop-filter:blur(10px);
    border:1px solid rgba(255,255,255,0.08);
    border-radius:9px;
    color:#fff;
  }
  .icon-btn:hover{background:rgba(255,255,255,0.12);}

  .stops-dock{
    position:relative;
    z-index:5;
    width:100%;
    padding:20px 24px 24px;
    background:linear-gradient(to top, rgba(12,13,17,0.55), rgba(12,13,17,0));
  }
  .stops-track-wrap{
    position:relative;
    height:34px;
  }
  .stops-track{
    position:absolute;
    top:50%;left:0;right:0;
    height:12px;
    transform:translateY(-50%);
    border-radius:999px;
    border:1px solid rgba(255,255,255,0.25);
    box-shadow:0 2px 10px rgba(0,0,0,.4);
  }
  .stop-handle{
    position:absolute;
    top:50%;
    width:20px;height:20px;
    margin:-10px 0 0 -10px;
    border-radius:50%;
    border:3px solid #fff;
    box-shadow:0 2px 6px rgba(0,0,0,.5);
    cursor:grab;
    touch-action:none;
  }
  .stop-handle.selected{box-shadow:0 0 0 3px var(--accent), 0 2px 6px rgba(0,0,0,.5);}
  .stop-handle:active{cursor:grabbing;}
  .stops-hint{
    font-family:var(--mono);
    font-size:11px;
    color:rgba(242,242,239,0.55);
    margin-top:10px;
  }

  /* ---------------- Control panel ---------------- */
  .panel{
    background:var(--surface);
    border-left:1px solid var(--border-soft);
    padding:22px 20px 40px;
    overflow-y:auto;
    max-height:calc(100vh - var(--header-h));
  }
  @media (max-width:960px){ .panel{border-left:none; max-height:none;} }

  .color-list{display:flex;flex-direction:column;gap:8px;}
  .color-row{
    display:flex;align-items:center;gap:10px;
    background:var(--surface-2);
    border:1px solid var(--border-soft);
    border-radius:9px;
    padding:8px 10px;
  }
  .color-row input[type=color]{
    width:28px;height:28px;
    border:none;border-radius:7px;
    padding:0;background:none;
    cursor:pointer;
  }
  .color-row input[type=color]::-webkit-color-swatch-wrapper{padding:0;}
  .color-row input[type=color]::-webkit-color-swatch{border:1px solid rgba(255,255,255,.15);border-radius:7px;}
  .color-row input[type=text]{
    flex:1;
    background:none;border:none;outline:none;
    font-family:var(--mono);font-size:12px;
    color:var(--text);
    min-width:0;
  }
  .color-row .pos{
    font-family:var(--mono);
    font-size:11px;
    color:var(--text-faint);
    width:34px;text-align:right;
  }
  .color-row .rm{
    background:none;border:none;color:var(--text-faint);
    font-size:16px;line-height:1;padding:2px 4px;
  }
  .color-row .rm:hover{color:#f0729b;}

  .harmony-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:8px;
  }
  .harmony-grid button{
    text-align:left;
    padding:9px 10px;
    background:var(--surface-2);
    border:1px solid var(--border-soft);
    border-radius:9px;
    font-size:12px;
    color:var(--text-dim);
  }
  .harmony-grid button:hover{color:var(--text);border-color:var(--border);}
  .harmony-grid .dots{
    display:flex;gap:3px;margin-bottom:6px;
  }
  .harmony-grid .dot{width:9px;height:9px;border-radius:50%;}

  .code-box{
    position:relative;
    background:var(--surface-2);
    border:1px solid var(--border-soft);
    border-radius:9px;
    padding:12px 12px 12px;
  }
  .code-box pre{
    margin:0;
    font-family:var(--mono);
    font-size:11.5px;
    line-height:1.6;
    white-space:pre-wrap;
    word-break:break-all;
    max-height:140px;
    overflow-y:auto;
  }
  .code-box .copy{
    position:absolute;top:8px;right:8px;
    font-family:var(--mono);
    font-size:10.5px;
    padding:4px 8px;
    background:var(--surface-3);
    border:1px solid var(--border);
    border-radius:6px;
    color:var(--text-dim);
  }
  .code-box .copy:hover{color:var(--text);}
  .code-tabs{display:flex;gap:6px;margin-bottom:8px;}
  .code-tabs button{
    font-size:11px;font-family:var(--mono);
    background:none;border:1px solid var(--border-soft);
    color:var(--text-faint);
    padding:4px 9px;border-radius:6px;
  }
  .code-tabs button.active{color:var(--accent);border-color:var(--accent-dim);}

  .panel h2{
    font-family:var(--display);
    font-size:18px;
    font-weight:600;
    margin:0 0 4px;
  }
  .panel .sub{
    font-size:12.5px;
    color:var(--text-faint);
    margin:0 0 22px;
    line-height:1.5;
  }

  .checkbox-row{
    display:flex;align-items:center;justify-content:space-between;
  }
  .switch{
    position:relative;width:36px;height:20px;
    background:var(--surface-3);
    border:1px solid var(--border-soft);
    border-radius:999px;
    cursor:pointer;
  }
  .switch::after{
    content:'';position:absolute;top:1px;left:1px;
    width:16px;height:16px;border-radius:50%;
    background:var(--text-dim);
    transition:transform .15s ease, background .15s ease;
  }
  .switch.on{background:var(--accent-soft);border-color:var(--accent-dim);}
  .switch.on::after{transform:translateX(16px);background:var(--accent);}

  .mode-panel{display:none;}
  .mode-panel.active{display:block;}

  .share-box{
    display:none;
    align-items:center;
    gap:8px;
    margin-top:10px;
    background:var(--surface-2);
    border:1px solid var(--border-soft);
    border-radius:9px;
    padding:6px 6px 6px 12px;
  }
  .share-box input{
    flex:1;
    background:none;border:none;outline:none;
    font-family:var(--mono);font-size:11.5px;
    color:var(--text-dim);
    min-width:0;
  }
  .share-status{
    font-size:11px;
    color:var(--text-faint);
    margin:8px 0 0;
    min-height:14px;
  }
  .share-status.error{color:#f0729b;}