:root{--bg: #f4f7fb;--surface: #ffffff;--text: #1a2332;--muted: #5c6b7a;--border: #d8e0ea;--primary: #1e6b9c;--primary-hover: #155a84;--danger: #c0392b;--positive: #1a7f4b;--negative: #c0392b;--shadow: 0 2px 8px rgba(26, 35, 50, .08);font-family:Segoe UI,system-ui,-apple-system,sans-serif;line-height:1.5;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-height:100vh}.app{max-width:960px;margin:0 auto;padding:1.5rem 1rem 3rem}header{margin-bottom:1.5rem}.header-row{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:.75rem}.save-status{font-size:.9rem;min-height:1.5rem}.saved{color:var(--positive);font-weight:600}header h1{margin:0 0 .25rem;font-size:1.75rem}.subtitle{margin:0;color:var(--muted)}main{display:flex;flex-direction:column;gap:1rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.25rem;box-shadow:var(--shadow)}.card h2{margin:0 0 .75rem;font-size:1.15rem}.card-header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem;margin-bottom:.75rem}.card-header h2{margin:0}.hint{color:var(--muted);margin:0}.error{color:var(--danger);margin:.5rem 0 0}.people-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:.5rem}.field{display:flex;flex-direction:column;gap:.25rem;font-size:.9rem}.field.inline{flex-direction:row;align-items:center;gap:.5rem}.field span{color:var(--muted);font-size:.85rem}input[type=text],input[type=number],select{padding:.5rem .65rem;border:1px solid var(--border);border-radius:8px;font:inherit;background:#fff}input:focus,select:focus{outline:2px solid rgba(30,107,156,.25);border-color:var(--primary)}.expense-form{display:flex;flex-direction:column;gap:.75rem}.split-mode,.participants,.custom-shares{border:1px solid var(--border);border-radius:8px;padding:.75rem;margin:0}.split-mode legend,.participants legend,.custom-shares legend{padding:0 .25rem;font-size:.85rem;color:var(--muted)}.split-mode label{margin-right:1rem}.checkbox-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:.35rem}.custom-shares{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:.5rem}.actions{display:flex;flex-wrap:wrap;gap:.5rem}.btn{padding:.45rem .85rem;border:1px solid var(--border);border-radius:8px;background:#fff;font:inherit;cursor:pointer}.btn:hover:not(:disabled){background:var(--bg)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--primary);color:#fff;border-color:var(--primary);align-self:flex-start}.btn.primary:hover{background:var(--primary-hover)}.btn.danger{color:var(--danger);border-color:#f0c9c5}.btn.small{padding:.25rem .5rem;font-size:.85rem}.form-actions{display:flex;flex-wrap:wrap;gap:.5rem}.row-actions{display:flex;flex-wrap:wrap;gap:.35rem}.row-editing{background:#eef6fb}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:.95rem}th,td{text-align:left;padding:.55rem .65rem;border-bottom:1px solid var(--border)}th{color:var(--muted);font-weight:600;font-size:.85rem}.split-cell{font-size:.85rem;color:var(--muted)}.positive{color:var(--positive);font-weight:600}.negative{color:var(--negative);font-weight:600}.zero{color:var(--muted)}.mode-toggle{display:flex;gap:1rem;margin-bottom:.75rem}.summary{margin:0 0 .75rem;font-weight:600}.transfer-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.5rem}.transfer-list li{display:flex;align-items:center;gap:.5rem;padding:.65rem .85rem;background:var(--bg);border-radius:8px;flex-wrap:wrap}.transfer-from,.transfer-to{font-weight:600}.arrow{color:var(--muted)}.transfer-amount{margin-left:auto;font-weight:600;font-variant-numeric:tabular-nums}@media(max-width:600px){.transfer-amount{margin-left:0;width:100%}}.expense-filter{margin-bottom:.75rem;padding:.85rem;background:var(--bg);border-radius:10px;border:1px solid var(--border)}.filter-row{display:flex;flex-wrap:wrap;gap:.75rem;align-items:flex-end}.filter-row .field{min-width:180px}.filter-summary{margin:.5rem 0 0}.expense-row{cursor:pointer}.expense-row:hover{background:#f8fbfd}.row-selected{background:#eef6fb}.expense-description{font-weight:600}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#1a233273;display:flex;align-items:center;justify-content:center;padding:1rem;z-index:100}.modal{width:min(560px,100%);max-height:calc(100vh - 2rem);overflow-y:auto;background:var(--surface);border-radius:14px;border:1px solid var(--border);box-shadow:0 12px 40px #1a23322e;padding:1.25rem}.modal-header{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:1rem}.modal-header h2{margin:0;font-size:1.35rem}.modal-subtitle{margin:.25rem 0 0;font-size:1.1rem;font-weight:600;color:var(--primary)}.icon-btn{font-size:1.5rem;line-height:1;padding:.15rem .55rem}.detail-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:.75rem;margin-bottom:1rem}.detail-item{background:var(--bg);border-radius:8px;padding:.75rem;display:flex;flex-direction:column;gap:.25rem}.detail-label{font-size:.85rem;color:var(--muted)}.detail-value{font-weight:600}.detail-section{margin-bottom:1rem}.detail-section h3{margin:0 0 .6rem;font-size:1rem}.detail-hint{margin:.5rem 0 0}.badge{display:inline-block;margin-left:.4rem;padding:.1rem .4rem;border-radius:999px;background:#dbeaf5;color:var(--primary);font-size:.75rem;font-weight:600}.transfer-list.compact li{padding:.5rem .75rem}.modal-actions{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.5rem}.graph-wrap{position:relative;margin-top:.75rem;overflow:hidden;border:1px solid var(--border);border-radius:12px;background:linear-gradient(180deg,#f8fbfe,#fff)}.graph-zoom{position:absolute;top:.65rem;right:.65rem;z-index:2;display:flex;align-items:center;gap:.35rem;background:#ffffffeb;border:1px solid var(--border);border-radius:8px;padding:.25rem .35rem}.graph-zoom-label{min-width:3.2rem;text-align:center;font-size:.85rem;font-variant-numeric:tabular-nums;color:var(--muted)}.debt-graph{display:block;width:100%;height:auto;touch-action:none;-webkit-user-select:none;user-select:none;cursor:grab}.debt-graph.is-panning{cursor:grabbing}.graph-edge{cursor:pointer}.graph-edge-line{pointer-events:stroke;stroke-linecap:round}.graph-edge-label{font-size:11px;fill:var(--text);paint-order:stroke;stroke:#fff;stroke-width:3px;pointer-events:none}.graph-node{cursor:grab}.graph-node:active{cursor:grabbing}.graph-node-label{font-size:11px;font-weight:700;fill:var(--text);pointer-events:none}.graph-detail{margin-top:.75rem;padding:.85rem;background:var(--bg);border-radius:10px;display:flex;flex-direction:column;gap:.35rem}.graph-detail ul{margin:.25rem 0 0;padding-left:1.1rem}.graph-overlay-open{overflow:hidden}.graph-card.is-fullscreen{position:fixed;top:0;right:0;bottom:0;left:0;z-index:80;max-width:none;border-radius:0;margin:0;display:flex;flex-direction:column;height:100vh;overflow:hidden}.graph-card.is-fullscreen .graph-wrap{flex:1;min-height:0;margin-bottom:0}.graph-card.is-fullscreen .debt-graph{height:100%}.graph-card.is-fullscreen .graph-detail{margin-bottom:0}.pair-page{position:fixed;top:0;right:0;bottom:0;left:0;z-index:90;background:var(--bg);overflow:auto;padding:1.5rem 1rem 3rem}.pair-page-inner{max-width:860px;margin:0 auto}.pair-page-header{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:.75rem;margin-bottom:1.25rem}.pair-page-header h2{margin:.15rem 0 0}.pair-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:.75rem;margin-bottom:1.25rem}.pair-direction{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1rem;margin-bottom:1rem;box-shadow:var(--shadow)}.pair-direction h3{margin:0;font-size:1.05rem}.pair-direction-head{display:flex;justify-content:space-between;align-items:baseline;gap:.75rem;margin-bottom:.75rem}.pair-direction tfoot th{border-bottom:none;padding-top:.75rem}