:root{--bg-color: #f4f6f9;--bg-surface: #ffffff;--bg-surface-elevated: rgba(255, 255, 255, .85);--primary-color: #6366f1;--primary-glow: rgba(99, 102, 241, .2);--secondary-color: #10b981;--accent-color: #f43f5e;--text-main: #1f2937;--text-muted: #6b7280;--border-color: rgba(0, 0, 0, .06);--safe-area-top: env(safe-area-inset-top, 0px);--safe-area-bottom: env(safe-area-inset-bottom, 0px)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}body{background-color:var(--bg-color);color:var(--text-main);font-family:Tajawal,sans-serif;line-height:1.5;min-height:100vh;overscroll-behavior-y:none;overflow-x:hidden}#app{width:100%;max-width:480px;margin:0 auto;min-height:100vh;position:relative;display:flex;flex-direction:column;background-color:var(--bg-color);box-shadow:0 0 20px #00000080;overflow-x:hidden}.glass-panel{background:var(--bg-surface-elevated);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-color);border-radius:24px}.no-scrollbar::-webkit-scrollbar{display:none}.no-scrollbar{-ms-overflow-style:none;scrollbar-width:none}.app-header{padding:32px 24px 24px;text-align:center;position:relative;z-index:10}.app-header h1{font-size:2.5rem;font-weight:800;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:4px}.app-header .subtitle{color:var(--text-muted);font-size:.9rem;font-weight:500;letter-spacing:1px;text-transform:uppercase}.app-content{flex:1;padding:0 24px 100px;display:flex;flex-direction:column;gap:32px;z-index:10}.balance-section{padding:24px;display:flex;flex-direction:column;gap:20px;position:relative;overflow:hidden}.balance-section:before{content:"";position:absolute;top:-50px;right:-50px;width:150px;height:150px;background:var(--primary-glow);filter:blur(60px);border-radius:50%;z-index:-1}.user-balances{display:flex;justify-content:space-between}.user-stat{display:flex;align-items:center;gap:12px}.avatar{width:48px;height:48px;border-radius:16px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.25rem;color:#fff;box-shadow:0 4px 12px #0000001a}.bg-primary{background:linear-gradient(135deg,var(--primary-color),#6d28d9)}.bg-secondary{background:linear-gradient(135deg,var(--secondary-color),#059669)}.bg-primary-light{background:#6366f126;color:#6366f1}.bg-secondary-light{background:#10b98126;color:#10b981}.bg-success-light{background:#10b98126;color:#059669}.bg-danger-light{background:#f43f5e26;color:#e11d48}.stat-info{display:flex;flex-direction:column}.user-name{font-size:.85rem;color:var(--text-muted)}.user-paid{font-size:1.1rem;font-weight:700}.settlement-info{padding-top:20px;border-top:1px solid var(--border-color)}.owes,.settled{display:flex;justify-content:space-between;align-items:center;padding:16px;border-radius:16px;font-weight:500}.owes .amount{font-weight:700;font-size:1.1rem}.settled{background:#00000008;color:var(--text-main);justify-content:center;gap:8px}.section-title{font-size:1.25rem;font-weight:600;margin-bottom:16px;color:var(--text-main)}.transactions-list{display:flex;flex-direction:column;gap:12px}.installments-section{margin-top:24px;padding:20px}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.add-mini-btn{background:var(--primary-color);color:#fff;border:none;width:32px;height:32px;border-radius:50%;font-size:20px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .2s ease,background .2s ease;box-shadow:0 4px 10px var(--primary-glow)}.add-mini-btn:hover{transform:scale(1.1);background:#4f46e5}.installments-list{display:flex;flex-direction:column;gap:12px}.installment-card{background:#ffffff80;border-radius:16px;padding:16px;position:relative;border:1px solid rgba(0,0,0,.05);transition:transform .2s ease}.installment-card:hover{transform:translateY(-2px)}.ins-info{margin-bottom:10px}.ins-main{display:flex;flex-direction:column}.ins-desc{font-weight:700;color:var(--text-main);font-size:1.1rem}.ins-total-tag{font-size:.8rem;font-weight:700;background:#0000000a;padding:4px 10px;border-radius:10px;color:var(--text-main);border:1px solid rgba(0,0,0,.03)}.ins-by{font-size:.75rem;color:var(--text-muted)}.ins-meta{display:flex;justify-content:space-between;margin-top:8px;font-size:.85rem}.ins-monthly{font-weight:600;color:var(--primary-color)}.ins-status{color:var(--text-muted)}.progress-container{height:6px;background:#0000000d;border-radius:3px;overflow:hidden}.progress-bar{height:100%;border-radius:3px;transition:width 1s cubic-bezier(.34,1.56,.64,1)}.delete-ins-btn{position:absolute;top:8px;left:8px;background:none;border:none;font-size:18px;color:var(--text-muted);cursor:pointer;opacity:.5;transition:opacity .2s ease,color .2s ease}.delete-ins-btn:hover{opacity:1;color:var(--danger-color)}.form-row{display:flex;gap:12px}.empty-state{text-align:center;padding:40px 20px;color:var(--text-muted);font-style:italic;background:var(--bg-surface-elevated);border-radius:20px;border:1px dashed var(--border-color)}.transaction-card{display:flex;align-items:center;padding:16px;gap:16px;transition:transform .2s ease}.transaction-card:active{transform:scale(.98)}.tx-icon{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;flex-shrink:0}.tx-details{flex:1;display:flex;flex-direction:column;gap:4px}.tx-desc{font-weight:500;font-size:1rem}.tx-date{font-size:.75rem;color:var(--text-muted)}.currency-icon{display:inline-block;width:1.1em;height:1.1em;vertical-align:middle;margin-left:4px;filter:brightness(0) opacity(.8)}.bg-primary .currency-icon,.bg-secondary .currency-icon,.tx-icon .currency-icon{filter:brightness(0) invert(1)}.owes .currency-icon{filter:brightness(0) opacity(.6)}.tx-amount{font-weight:700;font-size:1.1rem;text-align:left;display:flex;align-items:center;gap:4px}.currency{font-size:.8rem;font-weight:500;color:var(--text-muted)}.settled-card{opacity:.8;background:#10b9810d!important}.settled-badge{font-size:.65rem;font-weight:700;padding:2px 8px;background:var(--secondary-color);color:#fff;border-radius:8px;text-transform:uppercase}.fab{position:fixed;bottom:calc(32px + var(--safe-area-bottom));left:50%;transform:translate(-50%);width:64px;height:64px;border-radius:32px;background:linear-gradient(135deg,var(--accent-color),#be123c);color:#fff;border:none;box-shadow:0 8px 32px #f43f5e66;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:100;transition:transform .2s cubic-bezier(.34,1.56,.64,1),box-shadow .2s ease}.fab:hover,.fab:active{transform:translate(-50%) scale(.95);box-shadow:0 4px 16px #f43f5e66}.modal-overlay{position:fixed;inset:0;background:#0009;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);z-index:1000;display:flex;align-items:flex-end;justify-content:center;opacity:0;transition:opacity .3s ease}.modal-overlay.visible{opacity:1}.modal-overlay.hidden{display:none}.fullscreen-modal{align-items:center;background:#f4f6f9f2;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}.center-modal{border-radius:32px;border-bottom:1px solid var(--border-color);transform:scale(.9);opacity:0;transition:transform .3s cubic-bezier(.2,.8,.2,1),opacity .3s ease}.modal-overlay.visible .center-modal{transform:scale(1);opacity:1}.modal{width:100%;max-width:480px;margin:0 auto;padding:32px 24px calc(32px + var(--safe-area-bottom));background:var(--bg-surface);border-radius:32px 32px 0 0;border:1px solid var(--border-color);border-bottom:none;transform:translateY(100%);transition:transform .3s cubic-bezier(.2,.8,.2,1)}.modal-overlay.visible .modal{transform:translateY(0)}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.modal-header h2{font-size:1.5rem;font-weight:700;color:var(--primary-color)}.modal-desc{margin-bottom:24px;color:var(--text-muted);font-size:1.05rem}.identity-btn{width:100%;padding:16px;margin-bottom:12px;border:none;border-radius:16px;font-size:1.1rem;font-weight:700;font-family:Tajawal,sans-serif;color:#fff;cursor:pointer;transition:transform .2s ease}.identity-btn:active{transform:scale(.98)}.close-btn{background:#0000000d;border:none;width:36px;height:36px;border-radius:18px;color:var(--text-main);font-size:1.5rem;display:flex;align-items:center;justify-content:center;cursor:pointer}.form-group{margin-bottom:20px}.form-group label{display:block;font-size:.9rem;color:var(--text-muted);margin-bottom:8px;font-weight:500}.form-group input[type=text],.form-group input[type=number]{width:100%;padding:16px;background:#f9fafb;border:1px solid var(--border-color);border-radius:16px;color:var(--text-main);font-family:Tajawal,sans-serif;font-size:1.1rem;outline:none;transition:border-color .2s ease}.form-group input:focus{border-color:var(--primary-color)}.payer-selector{display:flex;gap:12px}.radio-label{flex:1;position:relative;cursor:pointer}.radio-label input{position:absolute;opacity:0}.radio-btn{display:block;text-align:center;padding:16px;border-radius:20px;font-weight:700;color:#fff;opacity:.3;border:2px solid var(--border-color);transition:all .3s cubic-bezier(.34,1.56,.64,1);filter:grayscale(.5)}.radio-label input:checked+.radio-btn{opacity:1;transform:scale(1.05);filter:grayscale(0);border-color:#0000001a;box-shadow:0 10px 25px -5px #0003,0 8px 10px -6px #0000001a,inset 0 0 0 2px #ffffff4d}.radio-label input:checked+.radio-btn.bg-primary{background:#4f46e5;box-shadow:0 10px 20px -5px #4f46e580}.radio-label input:checked+.radio-btn.bg-secondary{background:#059669;box-shadow:0 10px 20px -5px #05966980}.submit-btn{width:100%;padding:18px;margin-top:12px;background:var(--primary-color);color:#fff;border:none;border-radius:16px;font-size:1.1rem;font-weight:700;font-family:Tajawal,sans-serif;cursor:pointer;transition:transform .2s ease}.submit-btn:active{transform:scale(.98)}.button-group{display:flex;gap:12px;margin-top:12px}.danger-btn{width:100%;padding:18px;background:var(--bg-surface-elevated);color:var(--accent-color);border:1px solid var(--accent-color);border-radius:16px;font-size:1.1rem;font-weight:700;font-family:Tajawal,sans-serif;cursor:pointer;transition:transform .2s ease,background .2s ease}.danger-btn:active{transform:scale(.98);background:#f43f5e1a}