:root{--border:#d9d5cd;--bg:#faf8f6;--card:#fff;--text:#2a221f;--muted:#6b675f;--accent:#8e1116;--danger:#b3261e;--ok:#1e7a34}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font:15px/1.5 -apple-system,Segoe UI,sans-serif}a{color:var(--accent)}.shell{min-height:100vh;display:flex}.nav{background:var(--card);border-right:1px solid var(--border);flex:none;width:200px;padding:16px 0}.nav .brand{padding:0 16px 12px;font-weight:700}.nav a{color:var(--text);padding:8px 16px;text-decoration:none;display:block}.nav a:hover,.nav a.active{background:var(--bg);color:var(--accent)}.main{flex:1;min-width:0;padding:28px 32px 60px}.main>*{max-width:1180px;margin:0 auto}.card{background:var(--card);border:1px solid var(--border);border-radius:8px;margin-bottom:16px;padding:16px}h1{margin:0 0 16px;font-size:21px}h2{margin:0 0 10px;font-size:16px}table{border-collapse:collapse;width:100%;font-size:13.5px}th,td{text-align:left;border-bottom:1px solid var(--border);padding:7px 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h2{margin:0;font-size:16px}.step{width:25px;height:25px;color:var(--accent);background:#f7e8e8;border-radius:6px;place-items:center;font-size:11px;font-weight:800;display:grid}.table-scroll{overflow-x:auto}.sheet-table{font-size:14px}.sheet-table th{color:#625b53;text-transform:uppercase;letter-spacing:.04em;white-space:nowrap;background:#f6f3ef;font-size:10.5px}.sheet-table th,.sheet-table td{border:1px solid #e5e0d8}.sheet-table input:not([type=checkbox]),.sheet-table select{background:0 0;border-color:#0000;width:100%;min-width:110px}.sheet-table input:focus,.sheet-table select:focus{border-color:var(--accent);background:#fff;outline:none}.sheet-table tfoot td{color:var(--accent);background:#fbf1f1;font-weight:800}.cell-number{text-align:right;font-variant-numeric:tabular-nums}.strong{font-weight:750}.positive{color:var(--ok)}.icon-button{padding:2px 8px;font-size:18px;line-height:1.2}.stat-row{flex-wrap:wrap;align-items:center;gap:14px;margin-bottom:12px;display:flex}.stat-row label{flex-direction:row;align-items:center;gap:8px;font-size:12.5px}.stat-row input{width:100px}.stat-chip{color:var(--muted);background:#f6f3ef;border-radius:7px;padding:7px 12px;font-size:12.5px}.stat-chip b{color:var(--accent);font-size:14.5px}.operating-grid{grid-template-columns:1fr 1fr;align-items:start;gap:16px;display:grid}.form-grid{gap:12px;display:grid}.form-grid.three{grid-template-columns:repeat(3,1fr)}.form-grid.four{grid-template-columns:repeat(4,1fr)}.form-grid input,.form-grid select{width:100%;min-height:38px}.result-inline,.settlement{justify-content:flex-end;align-items:baseline;gap:12px;padding-top:13px;display:flex}.result-inline strong,.settlement strong{color:var(--accent);font-size:20px}.synced-chip{color:var(--ok);background:#f1faf3;border:1px solid #cfe2d2;border-radius:999px;padding:8px 12px;font-size:12px}.required-tag{color:#765b19;text-transform:uppercase;background:#fff0bd;border-radius:4px;margin-left:7px;padding:2px 5px;font-size:9px}.tax-row{background:#f8f6f2;border-radius:8px;grid-template-columns:150px 1fr 1fr;align-items:end;gap:14px;margin-bottom:14px;padding:12px;display:grid}.tax-row>label:first-child{flex-direction:row;align-items:center;padding-bottom:9px}.tax-row>div{justify-content:space-between;padding-bottom:8px;display:flex}.calculator-layout{grid-template-columns:minmax(0,1fr) 320px;align-items:start;gap:18px;display:grid}.result-panel{color:var(--text);background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;position:sticky;top:18px}.profit-hero{flex-direction:column;padding:6px 0 18px;display:flex}.profit-hero strong{font-size:32px;line-height:1.15}.profit-hero strong.positive{color:var(--ok)}.profit-hero strong.error{color:var(--danger)}.result-panel dl{margin:0}.result-panel dl>div{border-top:1px solid var(--border);justify-content:space-between;gap:10px;padding:10px 0;display:flex}.result-panel dt{color:var(--muted)}.result-panel 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input.cell-editable:focus{border-color:var(--accent);background:#fff}.cell-computed{background:#f6f3ef;font-weight:700}.segmented{border:1px solid var(--border);border-radius:7px;width:100%;min-height:36px;display:flex;overflow:hidden}.segmented-option{color:var(--text);font:inherit;text-align:center;white-space:nowrap;background:#fff;border:0;border-radius:0;flex:1;padding:7px 12px}.segmented-option+.segmented-option{border-left:1px solid var(--border)}.segmented-option.active{background:var(--accent);color:#fff;font-weight:600}.segmented-option:disabled{color:var(--muted);cursor:not-allowed;background:#f6f3ef}.combobox{position:relative}.combobox-menu{z-index:30;border:1px solid var(--border);background:#fff;border-radius:8px;max-height:280px;padding:4px;position:absolute;top:calc(100% + 4px);left:0;right:0;overflow-y:auto;box-shadow:0 10px 24px #2a221f1f}.combobox-option{text-align:left;width:100%;font:inherit;background:0 0;border:0;border-radius:5px;padding:7px 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