:root{--primary: #10b981;--primary-dark: #059669;--primary-light: #d1fae5;--bg: #f9fafb;--card-bg: #ffffff;--text-main: #111827;--text-muted: #6b7280;--danger: #ef4444;--border: #e5e7eb;--shadow: 0 1px 3px 0 rgba(0, 0, 0, .1), 0 1px 2px 0 rgba(0, 0, 0, .06);--radius: 1rem}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,sans-serif;background-color:var(--bg);color:var(--text-main);line-height:1.5;-webkit-font-smoothing:antialiased}.container{max-width:800px;margin:0 auto;padding:2rem 1rem 6rem}@media(min-width:768px){.container{padding-top:5rem;padding-bottom:2rem}}.auth-wrapper{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem}.auth-card{background:var(--card-bg);padding:2.5rem;border-radius:var(--radius);box-shadow:var(--shadow);width:100%;max-width:400px;border:1px solid var(--border)}.brand{text-align:center;margin-bottom:2rem}.brand h1{color:var(--primary);font-size:2.5rem;font-weight:800}.brand p{color:var(--text-muted);font-weight:500}.form-group{margin-bottom:1.25rem}label{display:block;font-size:.875rem;font-weight:600;margin-bottom:.5rem;color:#374151}input{width:100%;padding:.75rem 1rem;border:1px solid var(--border);border-radius:.75rem;font-size:1rem;transition:all .2s;outline:none;background:#fdfdfd}input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.75rem 1.5rem;border-radius:.75rem;font-weight:700;cursor:pointer;transition:all .2s;border:none;width:100%;font-size:1rem}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text-main)}.btn-outline:hover{background:#f9fafb}.error-message{background:#fef2f2;color:var(--danger);padding:.75rem;border-radius:.5rem;font-size:.875rem;margin-bottom:1rem;border:1px solid #fee2e2;display:none}.navbar{position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--border);display:flex;justify-content:space-around;padding:.75rem 0;z-index:100}@media(min-width:768px){.navbar{top:0;bottom:auto;border-top:none;border-bottom:1px solid var(--border);padding:.75rem 2rem;justify-content:center;gap:4rem}}.nav-item{text-decoration:none;color:var(--text-muted);display:flex;flex-direction:column;align-items:center;font-size:.75rem;font-weight:600}.nav-item.active{color:var(--primary)}.nav-item svg{width:24px;height:24px;margin-bottom:.25rem}.card{background:#fff;border-radius:var(--radius);padding:1.5rem;border:1px solid var(--border);margin-bottom:1rem;box-shadow:var(--shadow)}.grid{display:grid;grid-template-columns:1fr;gap:1rem}@media(min-width:640px){.grid-cols-2{grid-template-columns:1fr 1fr}.grid-cols-3{grid-template-columns:repeat(3,1fr)}}.biome-card{cursor:pointer;transition:transform .2s,border-color .2s}.biome-card:hover{transform:translateY(-2px);border-color:var(--primary)}.expense-item{display:flex;justify-content:space-between;align-items:center;padding:1rem;border-bottom:1px solid var(--border)}.expense-item:last-child{border-bottom:none}.amount{font-weight:800;font-size:1.25rem}.badge{padding:.25rem .75rem;border-radius:1rem;font-size:.75rem;font-weight:700;text-transform:uppercase}.badge-positive{background:#d1fae5;color:#065f46}.badge-negative{background:#fee2e2;color:#991b1b}.member-chip{padding:.75rem;border:2px solid var(--border);border-radius:.75rem;text-align:center;cursor:pointer;transition:all .2s}.member-chip.selected{border-color:var(--primary);background:var(--primary-light);color:var(--primary-dark)}.loader{width:24px;height:24px;border:3px solid #eee;border-top:3px solid var(--primary);border-radius:50%;animation:spin 1s linear infinite;display:none;margin:1rem auto}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}