:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#172033;background:#f3f6fb;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}.app-shell{width:min(1100px,calc(100% - 32px));margin:0 auto;padding:32px 0 64px}.hero{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:24px;padding:28px;color:#fff;border-radius:24px;background:linear-gradient(135deg,#172033,#31476f);box-shadow:0 20px 50px #1720332e}.hero h1{margin:4px 0 8px;font-size:clamp(2rem,5vw,3.5rem);line-height:1}.eyebrow,.section-kicker{margin:0;font-size:.75rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.hero-copy{max-width:620px;margin:0;color:#dfe7f5}.panel{margin-top:20px;padding:24px;border:1px solid #e1e7f0;border-radius:20px;background:#fff;box-shadow:0 10px 35px #1720330f}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.section-heading h2{margin:4px 0 0;font-size:1.35rem}.section-kicker{color:#64748b}.grid{display:grid;gap:16px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.span-two{grid-column:span 2}label,fieldset{display:grid;gap:8px;font-size:.9rem;font-weight:700;color:#364153}input{width:100%;min-height:44px;padding:10px 12px;border:1px solid #cfd8e6;border-radius:12px;color:#172033;background:#fff;outline:none}input:focus{border-color:#315da8;box-shadow:0 0 0 3px #315da824}.button,.icon-button{border:0;border-radius:12px;font-weight:800}.button{min-height:42px;padding:0 16px;color:#fff;background:#315da8}.button:hover{background:#284d8b}.button-secondary{color:#172033;background:#fff}.button-secondary:hover{background:#edf2f8}.icon-button{min-height:38px;padding:0 12px;color:#667085;background:#eef2f7}.stack,.expense-list{display:grid;gap:12px}.participant-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(160px,220px) auto;gap:12px;align-items:center}.money-input{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;border:1px solid #cfd8e6;border-radius:12px;background:#fff}.money-input:focus-within{border-color:#315da8;box-shadow:0 0 0 3px #315da824}.money-input input{border:0;box-shadow:none}.money-input span{padding-right:12px;color:#64748b}.expense-card{padding:18px;border:1px solid #e1e7f0;border-radius:16px;background:#fbfcfe}.expense-card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}fieldset{margin:16px 0 0;padding:0;border:0}legend{margin-bottom:10px}.chip-list{display:flex;flex-wrap:wrap;gap:8px}.chip{display:inline-flex;grid-auto-flow:column;align-items:center;gap:8px;padding:9px 12px;border:1px solid #cfd8e6;border-radius:999px;background:#fff}.chip.selected{border-color:#315da8;color:#244c8b;background:#edf4ff}.chip input{width:16px;min-height:16px;padding:0}.empty-state{padding:28px;border:1px dashed #b8c4d6;border-radius:16px;text-align:center;color:#64748b;background:#f8fafc}.warning-text{margin:12px 0 0;color:#c0342b;font-weight:700}.result-panel{border-color:#d6e0ef}.summary-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.summary-card{display:grid;gap:6px;padding:18px;border-radius:16px;background:#edf4ff}.summary-card span{color:#52637c;font-size:.86rem;font-weight:700}.summary-card strong{font-size:1.4rem}.summary-card.danger{color:#a52820;background:#fff0ee}.result-table-wrap{margin-top:18px;overflow-x:auto}table{width:100%;border-collapse:collapse}th,td{padding:14px 12px;border-bottom:1px solid #e5eaf1;text-align:right;white-space:nowrap}th:first-child,td:first-child{text-align:left}th{color:#64748b;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em}.negative{color:#c0342b;font-weight:900}.positive{color:#1d7a4d;font-weight:900}.balance-notes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:18px}.balance-note{display:flex;justify-content:space-between;gap:12px;padding:14px;border-radius:14px}.needs-payment{color:#a52820;background:#fff0ee}.has-refund{color:#17603d;background:#ecf9f2}.check-line{margin:18px 0 0;color:#64748b;font-size:.88rem}@media (max-width: 760px){.app-shell{width:min(100% - 20px,1100px);padding-top:10px}.hero,.section-heading{align-items:stretch;flex-direction:column}.hero{padding:22px;border-radius:18px}.panel{padding:18px;border-radius:16px}.grid.two,.grid.three,.summary-cards,.balance-notes{grid-template-columns:1fr}.span-two{grid-column:auto}.participant-row{grid-template-columns:1fr;padding:14px;border:1px solid #e1e7f0;border-radius:14px}.button{width:100%}}