:root { color-scheme: light only; }
  *,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
  body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:15px;background:#f3f4f6;color:#1a1a1a;min-height:100vh}
  .page{max-width:1100px;margin:0 auto;padding:1.5rem 1.5rem 4rem}
  .page-header{margin-bottom:1.5rem;display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:10px}
  .sub-row{display:flex;align-items:center;gap:8px;margin-top:4px}
  .sub-row .sub{margin:0}
  .sub-row select{width:auto;min-width:96px;height:32px;padding:0 28px 0 10px;border:1px solid #d1d5db;border-radius:8px;font-size:13px;font-family:inherit;color:#1a1a1a;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E") no-repeat right 8px center;-webkit-appearance:none;appearance:none;cursor:pointer}
  .sub-row select:focus{outline:none;border-color:#6366f1;box-shadow:0 0 0 3px rgba(99,102,241,.12)}
  h1{font-size:22px;font-weight:500;margin-bottom:4px}
  .sub{font-size:13px;color:#666}
  .layout{display:grid;grid-template-columns:1fr;gap:1.5rem}
  @media(min-width:800px){.layout{grid-template-columns:1fr 1fr 1fr;align-items:start}}
  .sec-title{display:block;font-size:11px;font-weight:500;color:#888;text-transform:uppercase;letter-spacing:.06em;margin-bottom:10px}
  .card{background:#fff;border:1px solid #e2e4e8;border-radius:12px;padding:1rem;margin-bottom:10px}
  .card-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:0;gap:8px;cursor:pointer}
  .card-title{display:flex;align-items:center;gap:6px;font-size:14px;font-weight:500;flex:1;min-width:0}
  .card-title-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .card-body{overflow:hidden;transition:max-height .25s ease,opacity .2s ease;max-height:600px;opacity:1;margin-top:10px}
  .card-body.collapsed{max-height:0!important;opacity:0;margin-top:0}
  .chevron-btn{background:none;border:none;cursor:pointer;color:#aaa;padding:2px;display:flex;align-items:center;flex-shrink:0;border-radius:4px;transition:transform .2s}
  .chevron-btn:hover{color:#555}
  .chevron-btn.collapsed{transform:rotate(-90deg)}
  .remove-btn{background:none;border:none;cursor:pointer;color:#aaa;padding:2px;display:flex;align-items:center;flex-shrink:0;border-radius:4px}
  .remove-btn:hover{color:#b91c1c;background:#fef2f2}

  /* tooltip */
  .tip-wrap{display:inline-flex;align-items:center}
  .tip-btn{width:16px;height:16px;border-radius:50%;border:1px solid #c4c4c4;background:#f9fafb;color:#888;font-size:10px;font-weight:600;cursor:default;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;font-family:serif;line-height:1}
  .tip-box{display:none;position:fixed;background:#1a1a1a;color:#f5f5f5;font-size:12px;line-height:1.6;padding:8px 12px;border-radius:8px;width:220px;z-index:9999;pointer-events:none;box-shadow:0 4px 14px rgba(0,0,0,.18)}

  /* source blocks */
  .src-grid{display:flex;flex-direction:column;gap:6px}
  .src-block{background:#fff;border:1px solid #e2e4e8;border-radius:10px;overflow:hidden}
  .src-block-hdr{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;cursor:pointer;gap:8px}
  .src-block-hdr:hover{background:#fafafa}
  .src-block-title{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:500;color:#1a1a1a;flex:1}
  .src-block-body{padding:0 12px 12px;display:none}
  .src-block-body.open{display:block}
  .src-item{display:flex;align-items:center;justify-content:space-between;padding:7px 10px;border-radius:7px;margin-bottom:4px;border:1px solid #e2e4e8;background:#fafafa;cursor:pointer;transition:background .1s}
  .src-item:last-child{margin-bottom:0}
  .src-item:hover{background:#f0f0ff;border-color:#c7c7ff}
  .src-item.active{background:#eef2ff;border-color:#6366f1}
  .src-item-left{display:flex;align-items:center;gap:6px;font-size:13px;color:#1a1a1a;flex:1}
  .src-item-check{width:16px;height:16px;border-radius:4px;border:1.5px solid #d1d5db;background:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .1s}
  .src-item.active .src-item-check{background:#6366f1;border-color:#6366f1}
  .src-item-check svg{display:none}
  .src-item.active .src-item-check svg{display:block}
  .src-chv{color:#aaa;transition:transform .2s;flex-shrink:0}
  .src-block-hdr.open .src-chv{transform:rotate(180deg)}

  /* active source cards */
  .active-sources{display:flex;flex-direction:column;gap:8px;margin-top:8px}
  .asrc-card{background:#fff;border:1px solid #e2e4e8;border-radius:10px;padding:10px 12px}
  .asrc-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;gap:8px}
  .asrc-title{font-size:13px;font-weight:500;color:#1a1a1a;display:flex;align-items:center;gap:6px}
  .asrc-body.collapsed{display:none}

  .field{display:flex;flex-direction:column;gap:5px;margin-bottom:10px}
  .field:last-child{margin-bottom:0}
  .field label{font-size:13px;color:#555}
  input[type=number],input[type=text],select{width:100%;height:40px;padding:0 10px;border:1px solid #d1d5db;border-radius:8px;font-size:14px;font-family:inherit;color:#1a1a1a;background:#fff;-webkit-appearance:none;appearance:none}
  input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}
  input[type=number]{-moz-appearance:textfield}
  select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;padding-right:32px}
  input[type=number]:focus,input[type=text]:focus,select:focus{outline:none;border-color:#6366f1;box-shadow:0 0 0 3px rgba(99,102,241,.12)}
  .hint{font-size:12px;color:#888;margin-top:5px}

  /* lengvatos */
  .leng-list{display:flex;flex-direction:column;gap:6px}
  .leng-item{border:1px solid #e2e4e8;border-radius:8px;overflow:hidden}
  .leng-hdr{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;background:#fafafa}
  .leng-hdr-left{display:flex;align-items:center;gap:8px;font-size:13px;color:#1a1a1a}
  .leng-body{padding:10px 12px;display:none;border-top:1px solid #e2e4e8}
  .leng-body.open{display:block}
  .toggle{position:relative;width:38px;height:22px;flex-shrink:0;cursor:pointer;display:block}
  .toggle input{opacity:0;width:0;height:0;position:absolute}
  .tog-track{position:absolute;inset:0;background:#d1d5db;border-radius:22px;transition:background .2s}
  .tog-track::before{content:'';position:absolute;height:16px;width:16px;left:3px;top:3px;background:#fff;border-radius:50%;transition:transform .2s}
  .toggle input:checked+.tog-track{background:#10b981}
  .toggle input:checked+.tog-track::before{transform:translateX(16px)}

  .submit-btn{width:100%;padding:13px;font-size:15px;font-weight:500;border:1px solid #d1d5db;border-radius:10px;background:#f3f4f6;cursor:pointer;font-family:inherit;color:#1a1a1a;transition:background .15s;margin-top:1rem}
  .btn-row{display:flex;gap:10px;align-items:stretch}
  .btn-row .submit-btn{flex:2 1 0}
  .reset-btn{flex:1 1 0;padding:13px;font-size:15px;font-weight:500;border:1px solid #e2e4e8;border-radius:10px;background:#fff;cursor:pointer;font-family:inherit;color:#666;transition:background .15s,color .15s,border-color .15s;margin-top:1rem}
  .reset-btn:hover{background:#f9fafb;color:#1a1a1a;border-color:#d1d5db}
  .reset-btn:active{transform:scale(.99)}
  .submit-btn:hover{background:#e5e7eb}
  .submit-btn:active{transform:scale(.99)}

  /* view toggle */
  .vtog{display:inline-flex;align-items:center;gap:5px;padding:6px 14px;font-size:12px;font-family:inherit;border:1px solid #d1d5db;border-radius:8px;background:transparent;cursor:pointer;color:#666;transition:background .1s}
  .vtog+.vtog{margin-left:6px}
  .vtog:hover{background:#e5e7eb}
  .vtog.active{background:#e5e7eb;color:#1a1a1a;font-weight:500}

  /* results */
  .r-tabs{display:flex;border:1px solid #e2e4e8;border-radius:8px;overflow:hidden;margin-bottom:12px}
  .r-tab{flex:1;padding:7px 6px;font-size:12px;text-align:center;cursor:pointer;border:none;border-right:1px solid #e2e4e8;background:transparent;font-family:inherit;color:#666}
  .r-tab:last-child{border-right:none}
  .r-tab.active{background:#f3f4f6;color:#1a1a1a;font-weight:500}
  .r-tab-panel{display:none}
  .r-tab-panel.active{display:block}
  .metrics{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:8px}
  .metric{background:#f9fafb;border-radius:8px;padding:12px}
  .metric-lbl{font-size:11px;color:#888;display:block;margin-bottom:4px}
  .metric-val{font-size:20px;font-weight:500;color:#1a1a1a}
  .r-row{display:flex;justify-content:space-between;font-size:13px;padding:5px 0;border-bottom:1px solid #f0f0f0;color:#555}
  .r-row:last-child{border-bottom:none}
  .r-row span:last-child{font-weight:500;color:#1a1a1a}
  .rgroup-title{display:block;font-size:11px;font-weight:500;color:#888;text-transform:uppercase;letter-spacing:.05em;margin:12px 0 6px}
  .rgroup-title:first-child{margin-top:0}
  .r-breakdown{display:none;padding:2px 0 4px 14px;border-bottom:1px solid #f0f0f0}
  .r-breakdown.open{display:block}
  .r-breakdown .r-brow{display:flex;justify-content:space-between;font-size:12px;padding:3px 0;color:#777}
  .r-breakdown .r-brow span:last-child{font-weight:500;color:#444}
  .neg{color:#b91c1c!important}
  .r-divider{height:1px;background:#e2e4e8;margin:10px 0}
  .bracket-row{display:flex;align-items:center;gap:8px;padding:5px 0;border-bottom:1px solid #f0f0f0;font-size:13px}
  .bracket-row:last-child{border-bottom:none}
  .bracket-row.dim{opacity:.3}
  .bracket-rate{width:52px;font-weight:500;color:#1a1a1a;flex-shrink:0;white-space:nowrap}
  .bracket-bar-wrap{flex:1;height:5px;background:#e2e4e8;border-radius:3px;overflow:hidden}
  .bracket-bar{height:100%;background:#E24B4A;border-radius:3px}
  .bracket-amt{font-size:12px;font-weight:500;color:#1a1a1a;min-width:72px;text-align:right}
  .bracket-total{display:flex;justify-content:space-between;font-size:13px;font-weight:500;color:#1a1a1a;padding:8px 0 0;border-top:1px solid #d1d5db;margin-top:4px}
  .acc-item{border-bottom:1px solid #f0f0f0}
  .acc-item:last-child{border-bottom:none}
  .acc-hdr{display:flex;justify-content:space-between;align-items:center;padding:9px 0;cursor:pointer}
  .acc-title{font-size:13px;font-weight:500;color:#1a1a1a}
  .acc-badge{font-size:12px;font-weight:500;color:#666;margin-right:6px}
  .acc-chv{color:#aaa;font-size:13px;transition:transform .2s}
  .acc-chv.open{transform:rotate(180deg)}
  .acc-body{display:none;padding-bottom:8px}
  .acc-body.open{display:block}
  .acc-row{display:flex;justify-content:space-between;font-size:13px;padding:4px 0;border-bottom:1px solid #f5f5f5;color:#555}
  .acc-row:last-child{border-bottom:none}
  .acc-row span:last-child{font-weight:500;color:#1a1a1a}

  .acc-src-add{margin-top:8px;background:none;border:1px dashed #c4c4c4;border-radius:6px;padding:5px 10px;font-size:12px;color:#666;cursor:pointer;font-family:inherit;width:100%}
  .acc-src-add:hover{background:#f0f0f0}
  .acc-src-rem{background:none;border:none;font-size:12px;color:#aaa;cursor:pointer;padding:0;font-family:inherit}
  .acc-src-rem:hover{color:#b91c1c}
  /* src view toggle */
  .sv-tog{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border:1px solid #d1d5db;border-radius:6px;background:transparent;cursor:pointer;color:#888;transition:all .15s}
  .sv-tog:hover{background:#e5e7eb;color:#1a1a1a}
  .sv-tog.active{background:#e5e7eb;color:#1a1a1a;border-color:#aaa}

  /* version B: accordion source list */
  .acc-src-list{display:flex;flex-direction:column;gap:0;border:1px solid #e2e4e8;border-radius:10px;overflow:hidden}
  .acc-src-item{border-bottom:1px solid #e2e4e8}
  .acc-src-item:last-child{border-bottom:none}
  .acc-src-hdr{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;cursor:pointer;background:#fff;transition:background .1s;gap:8px}
  .acc-src-hdr:hover{background:#fafafa}
  .acc-src-hdr.open{background:#f5f5ff;border-bottom:1px solid #e2e4e8}
  .acc-src-title{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:500;color:#1a1a1a;flex:1}
  .acc-src-chv{color:#aaa;transition:transform .2s;flex-shrink:0}
  .acc-src-hdr.open .acc-src-chv{transform:rotate(180deg)}
  .acc-src-body{display:none;padding:10px 12px;background:#fafafe;border-top:1px solid #eeeeff}
  .acc-src-body.open{display:block}
  /* multiple instances indicator */
  .acc-src-count{font-size:11px;background:#6366f1;color:#fff;border-radius:100px;padding:1px 7px;font-weight:500}