:root{--color-primary: #6366f1;--color-primary-dark: #4f46e5;--color-secondary: #10b981;--color-bg: #0f172a;--color-surface: #1e293b;--color-surface-light: #334155;--color-text: #f1f5f9;--color-text-muted: #94a3b8;--color-danger: #ef4444;--color-warning: #f59e0b;--radius: 12px;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--color-bg);color:var(--color-text);min-height:100vh;line-height:1.6}.container{max-width:480px;margin:0 auto;padding:1rem}.header{display:flex;align-items:center;justify-content:space-between;padding:1rem 0;margin-bottom:1.5rem}.header h1{font-size:1.5rem;font-weight:700;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.card{background:var(--color-surface);border-radius:var(--radius);padding:1.25rem;margin-bottom:1rem;box-shadow:var(--shadow);transition:transform .2s ease,box-shadow .2s ease}.card:hover{transform:translateY(-2px);box-shadow:0 8px 12px -3px #0003}.card-title{font-size:1.1rem;font-weight:600;margin-bottom:.5rem}.card-subtitle{color:var(--color-text-muted);font-size:.875rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;border:none;border-radius:var(--radius);font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s ease;text-decoration:none}.btn-primary{background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));color:#fff}.btn-primary:hover{transform:scale(1.02);box-shadow:0 4px 12px #6366f166}.btn-secondary{background:var(--color-surface-light);color:var(--color-text)}.btn-secondary:hover{background:#475569}.btn-danger{background:var(--color-danger);color:#fff}.btn-block{width:100%}.form-group{margin-bottom:1.25rem}.form-label{display:block;margin-bottom:.5rem;font-weight:500;color:var(--color-text-muted)}.form-input{width:100%;padding:.875rem 1rem;background:var(--color-surface-light);border:2px solid transparent;border-radius:var(--radius);color:var(--color-text);font-size:1rem;transition:border-color .2s ease}.form-input:focus{outline:none;border-color:var(--color-primary)}.form-input::placeholder{color:var(--color-text-muted)}.tabs{display:flex;gap:.5rem;margin-bottom:1.5rem;background:var(--color-surface);padding:.5rem;border-radius:var(--radius)}.tab{flex:1;padding:.75rem;background:transparent;border:none;border-radius:8px;color:var(--color-text-muted);font-weight:500;cursor:pointer;transition:all .2s ease}.tab.active{background:var(--color-primary);color:#fff}.debt-item{display:flex;align-items:center;justify-content:space-between;padding:1rem;background:var(--color-surface);border-radius:var(--radius);margin-bottom:.75rem}.debt-info{display:flex;align-items:center;gap:.75rem}.avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.875rem}.debt-amount{font-weight:700;font-size:1.125rem}.debt-amount.positive{color:var(--color-secondary)}.debt-amount.negative{color:var(--color-danger)}.empty-state{text-align:center;padding:3rem 1rem;color:var(--color-text-muted)}.empty-state-icon{font-size:3rem;margin-bottom:1rem}.file-input-wrapper{position:relative;overflow:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:200px;border:2px dashed var(--color-surface-light);border-radius:var(--radius);cursor:pointer;transition:border-color .2s ease}.file-input-wrapper:hover{border-color:var(--color-primary)}.file-input-wrapper input[type=file]{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;cursor:pointer}.file-input-icon{font-size:2.5rem;margin-bottom:.5rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-in{animation:fadeIn .3s ease forwards}.navbar-bottom{position:fixed;bottom:0;left:0;right:0;background:var(--color-surface);padding:.75rem 1rem;display:flex;justify-content:space-around;border-top:1px solid var(--color-surface-light)}.nav-item{display:flex;flex-direction:column;align-items:center;gap:.25rem;color:var(--color-text-muted);text-decoration:none;font-size:.75rem;transition:color .2s ease}.nav-item.active,.nav-item:hover{color:var(--color-primary)}.nav-icon{font-size:1.25rem}.spinner{width:40px;height:40px;border:3px solid var(--color-surface-light);border-top-color:var(--color-primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.mb-1{margin-bottom:.5rem}.mb-2{margin-bottom:1rem}.mb-3{margin-bottom:1.5rem}.mt-2{margin-top:1rem}.text-center{text-align:center}.text-muted{color:var(--color-text-muted)}