:root{--primary: #0f766e;--primary-dark: #115e59;--primary-light: #ccfbf1;--danger: #dc2626;--danger-light: #fef2f2;--success: #16a34a;--success-light: #f0fdf4;--bg: #f8fafc;--surface: #ffffff;--text: #0f172a;--muted: #64748b;--border: #e2e8f0;--radius: 14px;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .04)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased}#root{max-width:480px;margin:0 auto;min-height:100vh;background:var(--bg)}.screen{min-height:100vh;display:flex;flex-direction:column}.app-header{background:var(--primary);color:#fff;padding:18px 16px;display:flex;align-items:center;gap:12px;position:sticky;top:0;z-index:10}.app-header h1{font-size:1.3rem;font-weight:600}.header-action{margin-left:auto}.header-action .btn-clear{color:#fff;border-color:#fff6;padding:6px 12px;font-size:.85rem}.auth-intro{margin-bottom:20px}.auth-links{display:flex;flex-direction:column;gap:8px;margin-top:16px}.row-actions{display:flex;gap:14px;margin-top:6px}.link-btn{background:none;border:none;padding:0;font-size:.8rem;color:var(--primary);text-decoration:underline;cursor:pointer}.link-btn.danger{color:#b91c1c}.btn-danger{background:#b91c1c;color:#fff}.confirm-block{margin-bottom:20px}.item-line{display:flex;gap:8px;align-items:center;margin-bottom:8px}.item-line .item-desc{flex:1 1 auto;min-width:0}.item-line .item-price{flex:0 0 100px;text-align:right}.item-remove{flex:0 0 auto;font-size:1rem;padding:4px 6px;text-decoration:none}.item-remove:disabled{opacity:.3;cursor:not-allowed}.sale-total{display:flex;justify-content:space-between;align-items:baseline;margin:14px 0;padding-top:12px;border-top:1px solid var(--border, #e5e7eb);font-size:1.05rem}.locked-value{padding:12px;background:#f3f4f6;border-radius:8px;font-weight:600}.item-list{margin:10px 0 4px;padding-left:12px;border-left:2px solid var(--border, #e5e7eb)}.item-row{display:flex;justify-content:space-between;gap:10px;font-size:.85rem;padding:3px 0}.item-name{flex:1 1 auto;min-width:0}.item-amounts{flex:0 0 auto;white-space:nowrap}.item-left{margin-left:8px}.item-left.due{color:#b91c1c}.item-left.paid{color:#047857}.confirm-subject{font-weight:600;font-size:1.05rem;margin:10px 0}.stale-banner{position:fixed;bottom:0;left:0;right:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;background:#92400e;color:#fff;font-size:.85rem}.stale-banner .btn-clear{color:#fff;border-color:#ffffff80;padding:4px 10px;font-size:.8rem}.back-btn{background:#ffffff2e;color:#fff;border:none;padding:8px 14px;border-radius:10px;font-size:.95rem;font-weight:500;cursor:pointer;transition:background .15s}.back-btn:hover{background:#ffffff4d}.content{flex:1;padding:16px;display:flex;flex-direction:column;gap:16px}.action-row{display:flex;gap:10px}.btn{border:none;padding:14px 18px;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:transform .1s,opacity .15s;flex:1;text-align:center}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:var(--surface);color:var(--primary);border:2px solid var(--primary)}.btn-payment{background:var(--success-light);color:var(--success);border:2px solid var(--success);flex:0 0 auto;padding:10px 16px;font-size:.9rem}.btn-large{padding:18px;font-size:1.1rem;margin-top:8px}.card-list{list-style:none;display:flex;flex-direction:column;gap:10px}.card{background:var(--surface);border-radius:var(--radius);padding:16px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow);cursor:pointer;transition:transform .1s;border:1px solid var(--border)}.card:active{transform:scale(.98)}.card-name{font-size:1.1rem;font-weight:600}.card-sub{font-size:.9rem;margin-top:2px}.card-balance{font-size:1.25rem;font-weight:700;white-space:nowrap}.card-balance.due{color:var(--danger)}.card-balance.paid{color:var(--success)}.balance-block{background:var(--surface);border-radius:var(--radius);padding:24px 20px;text-align:center;box-shadow:var(--shadow);border:1px solid var(--border)}.balance-label{font-size:.95rem;color:var(--muted);margin-bottom:6px}.balance-amount{font-size:2.6rem;font-weight:800;line-height:1.1}.balance-amount.due{color:var(--danger)}.balance-amount.paid{color:var(--success)}.section-title{font-size:1.05rem;font-weight:600;margin-top:4px;padding-left:2px}.history-list{list-style:none;display:flex;flex-direction:column;gap:8px}.history-item{background:var(--surface);border-radius:10px;padding:14px 16px;display:flex;align-items:center;justify-content:space-between;border:1px solid var(--border)}.hist-desc{font-size:.98rem;font-weight:500}.hist-date{font-size:.85rem;margin-top:2px}.hist-amount{font-size:1.15rem;font-weight:700;white-space:nowrap}.hist-amount.sale{color:var(--danger)}.hist-amount.payment{color:var(--success)}.sale-item{background:var(--surface);border-radius:10px;padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid var(--border)}.sale-desc{font-weight:600;font-size:1rem}.sale-bal{margin-top:4px;font-size:.9rem;font-weight:600}.sale-bal.due{color:var(--danger)}.sale-bal.paid{color:var(--success)}.field{display:flex;flex-direction:column;gap:6px}.field-label{font-size:.9rem;font-weight:600;color:var(--text)}.input{padding:14px;border:2px solid var(--border);border-radius:12px;font-size:1.05rem;background:var(--surface);color:var(--text);outline:none;transition:border-color .15s;width:100%}.input:focus{border-color:var(--primary)}.info-box{background:var(--primary-light);color:var(--primary-dark);padding:14px 16px;border-radius:10px;font-size:1rem}.error-msg{background:var(--danger-light);color:var(--danger);padding:12px 16px;border-radius:10px;font-size:.95rem;font-weight:500}.empty{text-align:center;padding:40px 20px;color:var(--muted)}.empty p{margin-bottom:6px}.muted{color:var(--muted)}.search-bar{margin-bottom:4px}.section-header{display:flex;align-items:center;justify-content:space-between;gap:12px}.filter-toggle{background:var(--surface);color:var(--primary);border:2px solid var(--primary);padding:8px 16px;border-radius:10px;font-size:.9rem;font-weight:600;cursor:pointer;transition:background .15s}.filter-toggle:hover{background:var(--primary-light)}.filter-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;display:flex;flex-direction:column;gap:12px;box-shadow:var(--shadow)}.filter-row{display:flex;gap:10px}.filter-row .field{flex:1}.btn-clear{background:transparent;color:var(--danger);border:2px solid var(--danger);padding:10px 16px;border-radius:10px;font-size:.9rem;font-weight:600;cursor:pointer;flex:0 0 auto;transition:background .15s}.btn-clear:hover{background:var(--danger-light)}.filter-count{font-size:.88rem;padding-left:2px}