*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f7f8fc;--surface: #ffffff;--surface-2: #f0f2f8;--border: #e8eaef;--border-light: #f0f2f8;--text-primary: #0f1117;--text-secondary: #5f6b8a;--text-tertiary: #9ba5be;--accent: #5b5ef4;--accent-hover: #4547d4;--accent-light: #eeeeff;--accent-soft: #f0f0ff;--green: #059669;--green-bg: #ecfdf5;--red: #dc2626;--red-bg: #fef2f2;--amber: #d97706;--amber-bg: #fffbeb;--r-sm: 8px;--r-md: 12px;--r-lg: 16px;--r-xl: 20px;--r-full: 9999px;--shadow-sm: 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, .08), 0 2px 4px rgba(0, 0, 0, .04);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .1), 0 4px 8px rgba(0, 0, 0, .05);--sidebar-width: 228px;--header-h: 64px;--t: all .18s ease}html,body{height:100%}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text-primary);font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased}#root{height:100%}a{color:inherit;text-decoration:none}button{cursor:pointer;font-family:inherit;border:none;outline:none}input,textarea,select{font-family:inherit;outline:none;border:none}::-webkit-scrollbar{width:5px;height:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:99px}.app-layout{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0;overflow-y:auto}.sidebar-logo{padding:24px 20px 20px;display:flex;align-items:center;gap:10px}.sidebar-logo .logo-icon{width:32px;height:32px;background:var(--accent);border-radius:var(--r-sm);display:flex;align-items:center;justify-content:center;font-size:16px}.sidebar-logo .logo-text{font-size:15px;font-weight:700;color:var(--text-primary);letter-spacing:-.3px}.sidebar-nav{flex:1;padding:4px 10px}.nav-label{font-size:10px;font-weight:600;color:var(--text-tertiary);letter-spacing:1.2px;text-transform:uppercase;padding:12px 10px 6px}.nav-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--r-md);color:var(--text-secondary);font-size:13.5px;font-weight:500;transition:var(--t);cursor:pointer;margin-bottom:2px;-webkit-user-select:none;user-select:none}.nav-item:hover{background:var(--surface-2);color:var(--text-primary)}.nav-item.active{background:var(--accent-light);color:var(--accent);font-weight:600}.nav-item .nav-icon{font-size:16px;width:20px;text-align:center;flex-shrink:0}.sidebar-bottom{padding:16px 10px;border-top:1px solid var(--border-light)}.logout-btn{width:100%;display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:var(--r-md);background:none;color:var(--text-secondary);font-size:13.5px;font-weight:500;transition:var(--t)}.logout-btn:hover{background:var(--red-bg);color:var(--red)}.main-content{flex:1;overflow-y:auto;display:flex;flex-direction:column}.page-header{position:sticky;top:0;z-index:10;background:#f7f8fceb;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border);padding:0 32px;height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:16px}.page-title{font-size:18px;font-weight:700;color:var(--text-primary);letter-spacing:-.3px}.page-body{padding:28px 32px;flex:1}.btn{display:inline-flex;align-items:center;gap:7px;padding:9px 18px;border-radius:var(--r-md);font-size:13.5px;font-weight:600;transition:var(--t);white-space:nowrap}.btn-primary{background:var(--accent);color:#fff;box-shadow:0 2px 8px #5b5ef447}.btn-primary:hover{background:var(--accent-hover);box-shadow:0 4px 12px #5b5ef45c;transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background:var(--surface);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--surface-2);border-color:var(--border)}.btn-ghost{background:none;color:var(--text-secondary);padding:7px 12px}.btn-ghost:hover{background:var(--surface-2);color:var(--text-primary)}.btn-danger{background:var(--red-bg);color:var(--red)}.btn-danger:hover{background:var(--red);color:#fff}.btn-green{background:var(--green-bg);color:var(--green)}.btn-green:hover{background:var(--green);color:#fff}.btn-sm{padding:6px 12px;font-size:12.5px;border-radius:var(--r-sm)}.btn-icon{padding:8px;border-radius:var(--r-sm);background:none;color:var(--text-secondary);display:inline-flex;align-items:center;justify-content:center;transition:var(--t)}.btn-icon:hover{background:var(--surface-2);color:var(--text-primary)}.card{background:var(--surface);border-radius:var(--r-lg);border:1px solid var(--border);box-shadow:var(--shadow-sm)}.card-header{padding:20px 24px 16px;border-bottom:1px solid var(--border-light);display:flex;align-items:center;justify-content:space-between}.card-title{font-size:14px;font-weight:700;color:var(--text-primary);letter-spacing:-.2px}.card-body{padding:20px 24px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:20px 22px;box-shadow:var(--shadow-sm)}.stat-label{font-size:11px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:1px;margin-bottom:6px}.stat-value{font-size:26px;font-weight:700;color:var(--text-primary);letter-spacing:-.5px;line-height:1.2}.stat-value.positive{color:var(--green)}.stat-value.negative{color:var(--red)}.stat-value.neutral{color:var(--text-primary)}.stat-sub{font-size:12px;color:var(--text-tertiary);margin-top:4px}.table-wrap{width:100%;overflow-x:auto}table{width:100%;border-collapse:collapse}thead th{padding:10px 16px;font-size:11px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.8px;text-align:left;border-bottom:1px solid var(--border);white-space:nowrap}tbody tr{border-bottom:1px solid var(--border-light);transition:background .12s}tbody tr:last-child{border-bottom:none}tbody tr:hover{background:var(--surface-2)}tbody td{padding:13px 16px;font-size:13.5px;color:var(--text-primary);vertical-align:middle}.badge{display:inline-flex;align-items:center;padding:3px 9px;border-radius:var(--r-full);font-size:11px;font-weight:600;letter-spacing:.3px}.badge-accent{background:var(--accent-light);color:var(--accent)}.badge-green{background:var(--green-bg);color:var(--green)}.badge-red{background:var(--red-bg);color:var(--red)}.badge-amber{background:var(--amber-bg);color:var(--amber)}.badge-gray{background:var(--surface-2);color:var(--text-secondary)}.modal-overlay{position:fixed;inset:0;background:#0f111780;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:24px;animation:fadeIn .15s ease}.modal{background:var(--surface);border-radius:var(--r-xl);box-shadow:var(--shadow-lg);width:100%;max-width:520px;max-height:90vh;overflow-y:auto;animation:slideUp .2s ease}.modal-header{padding:24px 28px 20px;border-bottom:1px solid var(--border-light);display:flex;align-items:center;justify-content:space-between}.modal-title{font-size:17px;font-weight:700;color:var(--text-primary);letter-spacing:-.3px}.modal-body{padding:24px 28px}.modal-footer{padding:16px 28px 24px;display:flex;justify-content:flex-end;gap:10px}.form-group{margin-bottom:18px}.form-label{display:block;font-size:12.5px;font-weight:600;color:var(--text-secondary);margin-bottom:7px;letter-spacing:.2px}.form-input,.form-select,.form-textarea{width:100%;padding:10px 14px;background:var(--surface-2);border:1.5px solid var(--border);border-radius:var(--r-md);font-size:13.5px;color:var(--text-primary);transition:var(--t)}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--accent);background:var(--surface);box-shadow:0 0 0 3px #5b5ef41f}.form-select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235f6b8a' 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var(--border);border-radius:var(--r-full);font-size:13px;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:var(--t);-webkit-user-select:none;user-select:none}.checkbox-chip:hover{border-color:var(--accent);color:var(--accent)}.checkbox-chip.selected{background:var(--accent-light);border-color:var(--accent);color:var(--accent);font-weight:600}.avatar{width:32px;height:32px;border-radius:var(--r-full);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}.avatar-sm{width:26px;height:26px;font-size:10px}.avatar-lg{width:40px;height:40px;font-size:15px}.amount-row{display:flex;align-items:center;gap:12px;padding:8px 0;border-bottom:1px solid var(--border-light)}.amount-row:last-child{border-bottom:none}.amount-row label{flex:1;font-size:13.5px;color:var(--text-primary);font-weight:500}.amount-row input{width:110px;text-align:right}.balance-item{display:flex;align-items:center;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--border-light)}.balance-item:last-child{border-bottom:none}.balance-person{display:flex;align-items:center;gap:10px;font-weight:600;font-size:13.5px}.balance-amount{font-size:15px;font-weight:700}.balance-amount.owed{color:var(--green)}.balance-amount.owes{color:var(--red)}.balance-amount.settled{color:var(--text-tertiary)}.payment-suggestion{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--surface-2);border-radius:var(--r-md);margin-bottom:8px}.payment-suggestion:last-child{margin-bottom:0}.suggestion-arrow{color:var(--text-tertiary);font-size:18px}.suggestion-amount{margin-left:auto;font-weight:700;color:var(--accent);font-size:15px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 24px;text-align:center}.empty-icon{font-size:40px;margin-bottom:14px;opacity:.5}.empty-title{font-size:15px;font-weight:700;color:var(--text-secondary);margin-bottom:6px}.empty-desc{font-size:13px;color:var(--text-tertiary);max-width:280px}.login-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0f1117,#1a1d2e,#0f1117);padding:24px}.login-card{background:#ffffff08;border:1px solid rgba(255,255,255,.08);border-radius:24px;padding:48px 44px;width:100%;max-width:420px;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 24px 64px #00000080}.login-logo{display:flex;flex-direction:column;align-items:center;margin-bottom:36px;text-align:center}.login-logo-icon{width:52px;height:52px;background:var(--accent);border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:14px;box-shadow:0 8px 24px #5b5ef466}.login-logo h1{font-size:22px;font-weight:800;color:#fff;letter-spacing:-.5px;margin-bottom:6px}.login-logo p{font-size:13px;color:#ffffff73}.login-question{font-size:13px;font-weight:600;color:#ffffffa6;margin-bottom:10px;display:block;letter-spacing:.2px}.login-input{width:100%;padding:13px 16px;background:#ffffff0f;border:1.5px solid rgba(255,255,255,.1);border-radius:var(--r-md);font-size:15px;color:#fff;transition:var(--t);margin-bottom:16px}.login-input:focus{border-color:var(--accent);background:#5b5ef41a;box-shadow:0 0 0 3px #5b5ef433}.login-input::placeholder{color:#ffffff40}.login-btn{width:100%;padding:13px;background:var(--accent);color:#fff;border-radius:var(--r-md);font-size:14px;font-weight:700;transition:var(--t);box-shadow:0 4px 16px #5b5ef466}.login-btn:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 6px 20px #5b5ef480}.login-btn:active{transform:translateY(0)}.login-error{background:#dc26261f;border:1px solid rgba(220,38,38,.2);border-radius:var(--r-sm);padding:10px 14px;font-size:13px;color:#fca5a5;margin-top:12px;text-align:center}.log-item{display:flex;align-items:flex-start;gap:12px;padding:12px 0;border-bottom:1px solid var(--border-light)}.log-item:last-child{border-bottom:none}.log-dot{width:8px;height:8px;border-radius:50%;background:var(--accent);margin-top:5px;flex-shrink:0}.log-action{font-size:12.5px;font-weight:600;letter-spacing:.3px}.log-details{font-size:13px;color:var(--text-secondary);margin-top:1px}.log-time{font-size:11.5px;color:var(--text-tertiary);margin-top:2px}.member-card{display:flex;align-items:center;gap:14px;padding:16px 20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);transition:var(--t)}.member-card:hover{box-shadow:var(--shadow-md)}.member-info{flex:1}.member-name{font-size:14px;font-weight:700;margin-bottom:3px}.member-email-display{font-size:12.5px;color:var(--text-tertiary)}.section-gap{margin-bottom:24px}.section-gap-sm{margin-bottom:14px}.toast-container{position:fixed;bottom:28px;right:28px;z-index:9999;display:flex;flex-direction:column;gap:8px}.toast{background:var(--text-primary);color:#fff;padding:12px 18px;border-radius:var(--r-md);font-size:13.5px;font-weight:500;box-shadow:var(--shadow-lg);min-width:240px;animation:slideInRight .25s ease;display:flex;align-items:center;gap:10px}.toast.success{background:var(--green)}.toast.error{background:var(--red)}.toast.loading{background:var(--accent)}.spinner{width:18px;height:18px;border:2.5px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}.page-loading{display:flex;align-items:center;justify-content:center;padding:60px}.page-loading .spinner{width:24px;height:24px;border-color:var(--border);border-top-color:var(--accent)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(16px)}to{opacity:1;transform:translate(0)}}@keyframes spin{to{transform:rotate(360deg)}}.divider{height:1px;background:var(--border-light);margin:20px 0}@media(max-width:768px){.sidebar{display:none}.page-body{padding:20px 16px}.page-header{padding:10px 16px;height:auto;min-height:var(--header-h);flex-wrap:wrap;gap:8px}.page-header>div{flex-wrap:wrap;gap:6px}.grid-2,.grid-3,.grid-4,.form-row{grid-template-columns:1fr}.login-card{padding:36px 24px}}@media(max-width:540px){.email-summary-label{display:none}}