:root{--primary: #0284c7;--primary-dark: #0369a1;--primary-light: #e0f2fe;--primary-subtle: #f0f9ff;--success: #10b981;--success-dark: #059669;--success-light: #d1fae5;--success-subtle: #ecfdf5;--danger: #ef4444;--danger-dark: #dc2626;--danger-light: #fee2e2;--danger-subtle: #fef2f2;--bg-app: #f1f5f9;--bg-surface: #ffffff;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #94a3b8;--border: #e2e8f0;--border-subtle: #f1f5f9;--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--radius-xl: 26px;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-card: 0 2px 8px -2px rgba(15, 23, 42, .06), 0 1px 3px -1px rgba(15, 23, 42, .04);--shadow-float: 0 10px 25px -5px rgba(15, 23, 42, .12), 0 8px 10px -6px rgba(15, 23, 42, .04);--shadow-fab: 0 8px 20px -4px rgba(2, 132, 199, .45)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;font-weight:400;letter-spacing:-.012em;background-color:var(--bg-app);color:var(--text-primary);min-height:100vh;min-height:-webkit-fill-available;display:flex;flex-direction:column;overflow-x:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{display:flex;flex-direction:column;min-height:100vh;width:100%}.app-shell{display:flex;flex-direction:column;min-height:100vh;width:100%;max-width:540px;margin:0 auto;background:var(--bg-app);position:relative;padding-top:52px}.ios-nav-bar{position:fixed;top:0;left:0;right:0;z-index:40;background:#fffffff0;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:.5px solid rgba(0,0,0,.12);display:flex;justify-content:center;padding-top:env(safe-area-inset-top)}.ios-nav-bar-inner{width:100%;height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 16px}@media (min-width: 640px){.ios-nav-bar-inner{padding:0 24px}}.nav-icon-btn{width:34px;height:34px;border-radius:9px;border:none;background:var(--primary-light);color:var(--primary);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s ease;flex-shrink:0}.nav-icon-btn:hover{background:#bae6fd;color:var(--primary-dark)}.nav-icon-btn:active{transform:scale(.92)}.nav-title-group{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;flex:1;min-width:0;padding:0 8px}.nav-title{font-size:1.05rem;font-weight:700;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;width:100%}.nav-subtitle{font-size:.725rem;color:var(--text-muted);display:flex;align-items:center;gap:4px}.live-dot{width:6px;height:6px;border-radius:50%;background-color:var(--success);display:inline-block}.content-area{flex:1;padding:14px 16px 100px;width:100%}.segmented-control{display:flex;background:#e2e8f0;padding:3px;border-radius:12px;margin-bottom:16px;-webkit-user-select:none;user-select:none}.segmented-option{flex:1;text-align:center;padding:8px 12px;font-size:.875rem;font-weight:600;color:var(--text-secondary);border-radius:9px;cursor:pointer;border:none;background:transparent;transition:all .18s cubic-bezier(.4,0,.2,1);display:flex;align-items:center;justify-content:center;gap:6px}.segmented-option.active{background:#fff;color:var(--text-primary);box-shadow:0 1px 3px #0000001f,0 1px 2px #00000014}.mobile-hero-card{background:linear-gradient(135deg,#0284c7,#0369a1);color:#fff;border-radius:var(--radius-lg);padding:20px;margin-bottom:16px;box-shadow:0 10px 20px -5px #0284c759;position:relative;overflow:hidden}.hero-total-label{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px;opacity:.85}.hero-total-amount{font-size:2.1rem;font-weight:700;letter-spacing:-.5px;margin:4px 0 14px}.hero-stats-row{display:flex;align-items:center;gap:16px;padding-top:12px;border-top:1px solid rgba(255,255,255,.2)}.hero-stat{display:flex;align-items:center;gap:6px;font-size:.85rem;font-weight:600}.search-filter-box{display:flex;gap:8px;margin-bottom:12px}.search-input-wrapper{position:relative;flex:1}.search-input-wrapper svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-muted);pointer-events:none}.search-input{width:100%;padding:9px 12px 9px 36px;font-size:.875rem;border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-surface);color:var(--text-primary);outline:none}.search-input:focus{border-color:var(--primary)}.filter-chips-row{display:flex;gap:6px;overflow-x:auto;padding-bottom:6px;margin-bottom:12px;scrollbar-width:none;-webkit-overflow-scrolling:touch}.filter-chips-row::-webkit-scrollbar{display:none}.filter-chip{padding:6px 12px;border-radius:var(--radius-full);font-size:.775rem;font-weight:600;border:1px solid var(--border);background:var(--bg-surface);color:var(--text-secondary);cursor:pointer;white-space:nowrap;transition:all .15s}.filter-chip.active{background:var(--text-primary);color:#fff;border-color:var(--text-primary)}.participant-list{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}.participant-item{background:var(--bg-surface);border-radius:var(--radius-md);border:1px solid var(--border);box-shadow:var(--shadow-sm);padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer;transition:background .1s}.participant-item:active{background:#f8fafc}.participant-avatar{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.95rem;flex-shrink:0}.participant-meta{flex:1;min-width:0}.participant-name{font-size:.975rem;font-weight:700;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:flex;align-items:center;gap:6px}.participant-sub{font-size:.775rem;color:var(--text-secondary);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.balance-pill{display:inline-flex;flex-direction:column;align-items:flex-end;flex-shrink:0}.balance-pill-amount{font-size:.95rem;font-weight:600}.balance-pill-label{font-size:.675rem;font-weight:600;text-transform:uppercase;letter-spacing:.3px}.balance-positive{color:var(--success-dark)}.balance-negative{color:var(--danger-dark)}.balance-zero{color:var(--text-muted)}.participant-breakdown{padding:12px 14px 14px;background:#f8fafc;border-top:1px dashed var(--border);border-radius:0 0 var(--radius-md) var(--radius-md);margin-top:-8px;margin-bottom:8px;font-size:.8rem;animation:fadeIn .15s ease-out}.breakdown-row{display:flex;justify-content:space-between;padding:4px 0;color:var(--text-secondary)}.settlement-card{background:var(--bg-surface);border-radius:var(--radius-md);border:1px solid var(--border);padding:14px 16px;margin-bottom:8px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow-sm)}.settlement-parties{display:flex;align-items:center;gap:8px;font-size:.925rem}.ios-list-group{background:var(--bg-surface);border-radius:var(--radius-md);border:1px solid var(--border);box-shadow:var(--shadow-sm);overflow:hidden}.ios-list-item{padding:11px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer;border-bottom:1px solid #f1f5f9;background:var(--bg-surface);transition:background .12s ease}.ios-list-item:last-child{border-bottom:none}.ios-list-item:active{background:#f8fafc}.fab-add{position:fixed;bottom:74px;right:20px;z-index:35;width:54px;height:54px;border-radius:50%;background:var(--primary);color:#fff;border:none;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-fab);cursor:pointer;transition:transform .15s ease,background .15s ease}.fab-add:active{transform:scale(.92);background:var(--primary-dark)}@media (min-width: 541px){.fab-add{right:calc(50% - 250px)}}.ios-bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:30;background:#fffffff0;backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-top:.5px solid rgba(0,0,0,.12);display:flex;justify-content:center;padding-bottom:max(6px,env(safe-area-inset-bottom))}.ios-bottom-nav-inner{width:100%;display:flex;height:52px;padding:0 16px}@media (min-width: 640px){.ios-bottom-nav-inner{padding:0 24px}}.ios-tab-btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;border:none;background:transparent;color:var(--text-muted);cursor:pointer;font-size:.725rem;font-weight:600;transition:all .18s ease;position:relative}.tab-icon-wrap{width:44px;height:26px;border-radius:13px;display:inline-flex;align-items:center;justify-content:center;transition:all .18s ease;position:relative}.ios-tab-btn.active{color:var(--primary);font-weight:700}.ios-tab-btn.active .tab-icon-wrap{background:var(--primary-light);color:var(--primary)}.tab-badge{position:absolute;top:-2px;right:-6px;background:var(--primary);color:#fff;font-size:.65rem;font-weight:800;min-width:16px;height:16px;border-radius:8px;display:flex;align-items:center;justify-content:center;padding:0 4px;border:2px solid #ffffff}.sheet-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;background:#0f172a99;backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);display:flex;align-items:flex-end;justify-content:center;animation:fadeIn .18s ease-out}.sheet-backdrop-top{z-index:60}.sheet-container{background:#fff;width:100%;max-width:540px;border-radius:28px 28px 0 0;box-shadow:var(--shadow-float);overflow:hidden;max-height:88vh;display:flex;flex-direction:column;animation:slideUp .22s cubic-bezier(.16,1,.3,1);padding-bottom:max(16px,env(safe-area-inset-bottom))}.sheet-drag-handle{width:38px;height:5px;background:#cbd5e1;border-radius:var(--radius-full);margin:10px auto 4px;flex-shrink:0}.sheet-header{padding:12px 18px 14px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.sheet-header h3{font-size:1.15rem;font-weight:700;color:var(--text-primary)}.sheet-body{padding:16px 18px;overflow-y:auto;flex:1}.sheet-footer{padding:12px 18px;border-top:1px solid var(--border);display:flex;gap:10px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:11px 18px;border-radius:var(--radius-md);font-size:.925rem;font-weight:600;border:1px solid transparent;cursor:pointer;transition:all .15s;text-decoration:none}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:#fff;border-color:var(--border);color:var(--text-primary)}.btn-secondary:hover{background:#f8fafc}.btn-danger{background:var(--danger);color:#fff}.btn-icon{width:38px;height:38px;padding:0;border-radius:50%;display:inline-flex;align-items:center;justify-content:center}.btn-sm{padding:6px 12px;font-size:.825rem;border-radius:10px}.form-group{margin-bottom:14px}.form-group label{display:block;font-size:.825rem;font-weight:600;color:var(--text-secondary);margin-bottom:6px}.form-control{width:100%;padding:12px 14px;font-size:.95rem;font-family:inherit;border:1.5px solid var(--border);border-radius:var(--radius-md);background:#fff;color:var(--text-primary);outline:none;transition:border-color .15s}.form-control:focus{border-color:var(--primary)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}