:root{--bg: #f0f2f5;--surface: #ffffff;--text: #1a1a2e;--text-secondary: #5a5a7a;--primary: #4f6ef7;--primary-hover: #3b5de7;--danger: #ef4444;--danger-hover: #dc2626;--green: #16a34a;--red: #dc2626;--border: #e2e4e9;--chip-bg: #eef1ff;--chip-text: #4f6ef7;--radius: 10px;--shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .07)}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{min-height:100vh;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}.app{max-width:860px;margin:0 auto;padding:1.5rem 1rem 3rem}.app-header{text-align:center;margin-bottom:2rem}.app-header h1{font-size:1.75rem;font-weight:700;letter-spacing:-.03em;color:var(--text)}.subtitle{color:var(--text-secondary);font-size:.95rem;margin-top:.25rem}.app-body{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}@media(max-width:700px){.app-body{grid-template-columns:1fr}}.section{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.25rem 1.5rem;margin-bottom:1.5rem}.section h2{font-size:1.1rem;font-weight:650;margin-bottom:1rem;letter-spacing:-.01em}.section h3{font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--text-secondary);margin-bottom:.5rem;margin-top:1rem}.input-row{display:flex;gap:.5rem;margin-bottom:.75rem}.input{flex:1;padding:.55rem .75rem;border:1px solid var(--border);border-radius:8px;font-size:.9rem;background:var(--bg);color:var(--text);outline:none;transition:border-color .15s}.input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f6ef71f}.input-sm{width:100px;flex:none}select.input{cursor:pointer}.btn{padding:.55rem 1rem;border:none;border-radius:8px;font-size:.875rem;font-weight:600;cursor:pointer;transition:background .15s,opacity .15s}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-danger{background:transparent;color:var(--danger);border:1px solid var(--danger)}.btn-danger:hover{background:var(--danger);color:#fff}.btn-full{width:100%;margin-top:.5rem}.chip-list{display:flex;flex-wrap:wrap;gap:.4rem}.chip{display:inline-flex;align-items:center;gap:.35rem;background:var(--chip-bg);color:var(--chip-text);font-size:.82rem;font-weight:600;padding:.3rem .6rem;border-radius:20px}.chip-x{background:none;border:none;color:var(--chip-text);font-size:1rem;cursor:pointer;line-height:1;padding:0;opacity:.6}.chip-x:hover{opacity:1}.expense-form{display:flex;flex-direction:column;gap:.6rem}.split-toggle{display:flex;gap:0;border:1px solid var(--border);border-radius:8px;overflow:hidden}.toggle-btn{flex:1;padding:.45rem;border:none;background:var(--bg);color:var(--text-secondary);font-size:.82rem;font-weight:600;cursor:pointer;transition:all .15s}.toggle-btn.active{background:var(--primary);color:#fff}.split-config{background:var(--bg);border-radius:8px;padding:.75rem}.split-label{font-size:.8rem;font-weight:600;color:var(--text-secondary);margin-bottom:.4rem}.check-list{display:flex;flex-wrap:wrap;gap:.3rem 1rem;margin-bottom:.5rem}.check-item{display:flex;align-items:center;gap:.35rem;font-size:.85rem;cursor:pointer}.check-item input[type=checkbox]{accent-color:var(--primary);width:15px;height:15px}.custom-split-row{display:flex;align-items:center;gap:.5rem;margin-bottom:.35rem}.custom-split-name{font-size:.85rem;min-width:70px;color:var(--text-secondary)}.expense-list{display:flex;flex-direction:column;gap:.5rem}.expense-card{position:relative;padding:.75rem .9rem;background:var(--bg);border-radius:8px}.expense-header{display:flex;justify-content:space-between;align-items:center}.expense-desc{font-weight:600;font-size:.95rem}.expense-amount{font-weight:700;font-size:1rem;color:var(--primary)}.expense-meta{font-size:.78rem;color:var(--text-secondary);margin-top:.15rem}.btn-remove{position:absolute;top:.5rem;right:.5rem;background:none;border:none;color:var(--text-secondary);font-size:1.1rem;cursor:pointer;opacity:0;transition:opacity .15s;line-height:1;padding:.15rem}.expense-card:hover .btn-remove{opacity:.6}.btn-remove:hover{opacity:1!important;color:var(--danger)}.summary-total{background:var(--bg);padding:.75rem 1rem;border-radius:8px;font-size:.95rem;margin-bottom:.25rem}.summary-total strong{color:var(--primary);font-size:1.1rem}.balance-list{margin-bottom:.5rem}.balance-row{display:flex;justify-content:space-between;padding:.35rem 0;font-size:.9rem;border-bottom:1px solid var(--border)}.balance-row:last-child{border-bottom:none}.pos{font-weight:600;color:var(--green)}.neg{font-weight:600;color:var(--red)}.settlement-list{margin-top:.5rem}.settlement-row{display:flex;align-items:center;gap:.5rem;padding:.5rem .75rem;background:var(--bg);border-radius:8px;margin-bottom:.4rem;font-size:.9rem}.settlement-from{font-weight:600}.settlement-arrow{color:var(--text-secondary);font-size:1.1rem}.settlement-to{font-weight:600}.settlement-amount{margin-left:auto;font-weight:700;color:var(--primary)}.empty-hint{color:var(--text-secondary);font-size:.85rem;font-style:italic}.app-footer{text-align:center;margin-top:1rem}