:root{--primary:#4f46e5;--primary-hover:#4338ca;--success:#10b981;--danger:#ef4444;--bg-color:#f3f4f6;--card-bg:#fff;--text-main:#1f2937;--text-muted:#6b7280;--border:#e5e7eb;--shadow:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);--radius:12px;--input-bg:#fff}[data-theme=dark]{--bg-color:#111827;--card-bg:#1f2937;--text-main:#f9fafb;--text-muted:#9ca3af;--border:#374151;--input-bg:#374151;--shadow:0 4px 6px -1px rgba(0,0,0,.3)}*{box-sizing:border-box;margin:0;padding:0;font-family:Segoe UI,Roboto,Helvetica,Arial,sans-serif;transition:background-color .3s,color .3s}body{background-color:var(--bg-color);color:var(--text-main);line-height:1.6}.container{max-width:850px;margin:0 auto;padding:20px}header{justify-content:space-between;margin-bottom:24px}header,header h1{display:flex;align-items:center}header h1{color:var(--primary);font-size:1.8rem;gap:10px}.theme-toggle{background:var(--card-bg);border:1px solid var(--border);color:var(--text-main);padding:10px;border-radius:50%;cursor:pointer;box-shadow:var(--shadow)}.dashboard{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:20px}.stat-card{background:var(--card-bg);padding:20px;border-radius:var(--radius);box-shadow:var(--shadow);text-align:center}.stat-card h3{font-size:.9rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:8px}.stat-card .amount{font-size:1.8rem;font-weight:700}.text-success{color:var(--success)}.text-danger{color:var(--danger)}.text-primary{color:var(--primary)}.data-actions{display:flex;gap:10px;margin-bottom:30px;flex-wrap:wrap}.btn-action{background:var(--card-bg);color:var(--text-main);border:1px solid var(--border);padding:8px 16px;border-radius:8px;font-size:.9rem;cursor:pointer;display:flex;align-items:center;gap:6px;box-shadow:var(--shadow)}.btn-action:hover{background:var(--border)}.btn-action.danger:hover{background:var(--danger);color:#fff;border-color:var(--danger)}.add-form-container{background:var(--card-bg);padding:24px;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:30px;border:2px solid transparent}.add-form-container.edit-mode{border-color:var(--primary);box-shadow:0 0 15px rgba(79,70,229,.2)}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.form-group{display:flex;flex-direction:column;gap:6px}.form-actions,.form-group.full-width{grid-column:1/-1}.form-actions{display:flex;gap:12px;margin-top:10px}label{font-size:.9rem;font-weight:600}input,label,select{color:var(--text-main)}input,select{padding:10px 14px;border:1px solid var(--border);background-color:var(--input-bg);border-radius:8px;font-size:1rem}input:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(79,70,229,.1)}.autocomplete-wrapper{position:relative;width:100%}.suggestions-dropdown{position:absolute;top:100%;left:0;right:0;background:var(--card-bg);border:1px solid var(--border);border-top:none;border-radius:0 0 8px 8px;box-shadow:var(--shadow);max-height:200px;overflow-y:auto;z-index:1;display:none}.suggestions-dropdown.active{display:block}.suggestion-item{padding:10px 14px;cursor:pointer;color:var(--text-main);border-bottom:1px solid var(--border)}.suggestion-item:last-child{border-bottom:none}.suggestion-item:hover{background:rgba(79,70,229,.05)}::-webkit-calendar-picker-indicator{filter:invert(var(--invert-icon,0))}[data-theme=dark]{--invert-icon:1}button.btn-primary{background:var(--primary);color:#fff;border:none;padding:12px 20px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;flex:1;display:flex;align-items:center;justify-content:center;gap:8px}button.btn-primary:hover{background:var(--primary-hover)}button.btn-secondary{background:var(--card-bg);color:var(--text-main);border:1px solid var(--border);padding:12px 20px;border-radius:8px;font-weight:600;cursor:pointer;display:none;flex:1;justify-content:center;gap:8px;font-size:1rem}button.btn-secondary:hover{background:var(--border)}.controls-bar{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:20px;align-items:center;justify-content:space-between}.filters{display:flex;gap:8px}.filter-btn{background:var(--card-bg);color:var(--text-muted);border:1px solid var(--border);padding:6px 14px;border-radius:20px;font-size:.9rem;cursor:pointer}.filter-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.search-sort-group{display:flex;gap:12px;flex-grow:1;justify-content:flex-end}.search-box{position:relative;max-width:250px;width:100%}.search-box input{width:100%;padding-left:36px}.search-box i{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-muted)}.sort-box select{cursor:pointer}.transaction-list{display:flex;flex-direction:column;gap:12px}.transaction-item{background:var(--card-bg);padding:16px;border-radius:var(--radius);box-shadow:var(--shadow);display:flex;justify-content:space-between;align-items:center;border-left:4px solid transparent;gap:50px}.transaction-item.owe-me{border-left-color:var(--success)}.transaction-item.i-owe{border-left-color:var(--danger)}.transaction-item.settled{opacity:.6;border-left-color:var(--text-muted)}.t-info{display:flex;flex-direction:column;gap:4px}.t-contact{font-weight:600;font-size:1.1rem}.t-desc{font-size:.9rem}.t-desc,.t-meta{color:var(--text-muted)}.t-meta{display:flex;gap:12px;font-size:.8rem;margin-top:4px}.t-meta span{display:flex;align-items:center;gap:4px}.overdue{color:var(--danger)!important;font-weight:600}.t-actions{display:flex;align-items:center;gap:16px;min-width:fit-content}.t-amount{font-size:1.2rem;font-weight:700;text-align:right}.btn-icon{background:transparent;color:var(--text-muted);border:none;padding:8px;border-radius:50%;cursor:pointer;font-size:1.1rem}.btn-icon:hover{background:var(--bg-color);color:var(--text-main)}.btn-icon.check:hover{color:var(--success)}.btn-icon.edit:hover{color:var(--primary)}.btn-icon.trash:hover{color:var(--danger)}.btn-icon.share:hover{color:var(--primary)}.empty-state{text-align:center;padding:40px;color:var(--text-muted)}#toast-container{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;gap:10px;z-index:2}.toast{background:#333;color:#fff;padding:12px 20px;border-radius:8px;box-shadow:0 4px 12px rgba(0,0,0,.15);display:flex;align-items:center;gap:10px;opacity:0;transform:translateY(20px);transition:opacity .3s,transform .3s}.toast.show{opacity:1;transform:translateY(0)}.toast.success{border-left:4px solid var(--success)}.toast.error{border-left:4px solid var(--danger)}.toast.info{border-left:4px solid var(--primary)}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:3;opacity:0;pointer-events:none;transition:opacity .3s}.modal-overlay.active{opacity:1;pointer-events:auto}.modal-content{background:var(--card-bg);border-radius:var(--radius);width:90%;max-width:600px;max-height:90vh;display:flex;flex-direction:column;box-shadow:var(--shadow);transform:translateY(-20px);transition:transform .3s}.modal-overlay.active .modal-content{transform:translateY(0)}.modal-header{padding:20px;border-bottom:1px solid var(--border);justify-content:space-between}.modal-header,.modal-header h2{display:flex;align-items:center}.modal-header h2{font-size:1.2rem;color:var(--primary);gap:8px;margin:0}.close-btn{background:transparent;border:none;font-size:1.5rem;color:var(--text-muted);cursor:pointer}.close-btn:hover{color:var(--danger)}.modal-body{padding:20px;overflow-y:auto;display:flex;flex-direction:column;gap:16px}.analysis-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin-bottom:10px}.analysis-summary .stat-card{padding:15px}.analysis-summary .stat-card h3{font-size:.75rem}.analysis-summary .stat-card .amount{font-size:1.2rem}.contact-list-header{display:flex;align-items:center;gap:8px;font-weight:600;padding-bottom:10px;border-bottom:1px solid var(--border)}.analysis-contacts-list{display:flex;flex-direction:column;gap:10px}.analysis-contact-item{display:grid;grid-template-columns:auto 1fr auto auto auto;align-items:center;gap:12px;padding:12px;background:var(--bg-color);border-radius:8px;border:1px solid var(--border)}.analysis-contact-name{font-weight:600;cursor:pointer;user-select:none}.analysis-contact-balances{display:flex;gap:16px;font-size:.9rem;align-items:center}.share-options{gap:12px}.share-option-btn,.share-options{display:flex;flex-direction:column}.share-option-btn{background:var(--bg-color);border:1px solid var(--border);padding:12px;border-radius:8px;text-align:left;color:var(--text-main);font-size:.9rem;gap:8px}.share-option-btn:hover{border-color:var(--primary);background:rgba(79,70,229,.05)}.share-actions{display:flex;gap:8px}.share-actions button{flex:1;padding:8px;border:none;border-radius:6px;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;font-weight:600;font-size:.85rem}.btn-copy{background:var(--card-bg);border:1px solid var(--border);color:var(--text-main)}.btn-copy:hover{background:var(--border)}.btn-share{background:var(--primary);color:#fff}.btn-share:hover{background:var(--primary-hover)}@media (max-width:768px){.form-grid{grid-template-columns:1fr}.controls-bar{align-items:stretch}.controls-bar,.search-sort-group{flex-direction:column}.search-box{max-width:100%}.transaction-item{flex-direction:column;align-items:flex-start;gap:12px}.t-actions{width:100%;justify-content:space-between;flex-direction:row-reverse}.analysis-contact-item{grid-template-columns:auto 1fr;grid-template-rows:auto auto;gap:8px}.analysis-contact-balances{grid-column:1/-1;flex-wrap:wrap;gap:8px;justify-content:space-between}}