:root{--primary:#1cc29f;--primary-dark:#14a085;--danger:#e25a5a;--bg:#f6f8f9;--card:#fff;--border:#e2e8e8;--text:#2d3436;--text-muted:#7a8a8a;--positive:#1cc29f;--negative:#e25a5a;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}#root{min-height:100vh}a{color:var(--primary-dark);text-decoration:none}.container{max-width:900px;margin:0 auto;padding:24px 16px}.navbar{background:var(--card);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 24px;display:flex}.navbar .brand{color:var(--primary-dark);font-size:20px;font-weight:700}.navbar .nav-links{align-items:center;gap:16px;display:flex}.btn{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:9px 18px;font-size:14px;font-weight:600;transition:background .15s;display:inline-block}.btn:hover{background:var(--primary-dark)}.btn.secondary{color:var(--text);border:1px solid var(--border);background:0 0}.btn.secondary:hover{background:var(--bg)}.btn.danger{background:var(--danger)}.btn.danger:hover{background:#c84444}.btn:disabled{opacity:.6;cursor:not-allowed}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;margin-bottom:16px;padding:20px}.form-group{margin-bottom:14px}label{margin-bottom:6px;font-size:14px;font-weight:600;display:block}input,select,textarea{border:1px solid var(--border);width:100%;color:var(--text);background:#fff;border-radius:8px;padding:10px 12px;font-size:14px}input:focus,select:focus,textarea:focus{outline:2px solid var(--primary);border-color:var(--primary)}.auth-page{justify-content:center;align-items:center;min-height:100vh;padding:16px;display:flex}.auth-card{background:var(--card);border:1px solid var(--border);border-radius:12px;width:100%;max-width:380px;padding:32px}.auth-card h1{color:var(--primary-dark);margin-top:0}.error-text{color:var(--danger);margin-top:6px;font-size:13px}.positive{color:var(--positive);font-weight:700}.negative{color:var(--negative);font-weight:700}.muted{color:var(--text-muted)}.flex-between{justify-content:space-between;align-items:center;display:flex}.group-list{gap:12px;display:grid}.group-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px 20px;transition:border-color .15s;display:block}.group-card:hover{border-color:var(--primary)}.tabs{border-bottom:1px solid var(--border);gap:4px;margin-bottom:16px;display:flex}.tab{cursor:pointer;color:var(--text-muted);border-bottom:2px solid #0000;padding:10px 16px;font-weight:600}.tab.active{color:var(--primary-dark);border-bottom-color:var(--primary)}.expense-item{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:12px 0;display:flex}.expense-item:last-child{border-bottom:none}.split-row{grid-template-columns:1fr 100px;align-items:center;gap:12px;margin-bottom:8px;display:grid}.split-row input[type=checkbox]{width:auto;margin-right:8px}.chat-box{border:1px solid var(--border);border-radius:8px;flex-direction:column;height:320px;display:flex;overflow:hidden}.chat-messages{flex-direction:column;flex:1;gap:8px;padding:12px;display:flex;overflow-y:auto}.chat-message{background:var(--bg);border-radius:8px;max-width:80%;padding:8px 12px}.chat-message.mine{background:var(--primary);color:#fff;align-self:flex-end}.chat-message .meta{opacity:.7;margin-bottom:2px;font-size:11px}.chat-input{border-top:1px solid var(--border);display:flex}.chat-input input{border:none;border-radius:0;flex:1}.chat-input button{border-radius:0}.member-row{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:8px 0;display:flex}.member-row:last-child{border-bottom:none}.modal-overlay{z-index:50;background:#0006;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal{background:var(--card);border-radius:12px;width:100%;max-width:420px;padding:24px}.balance-row{border-bottom:1px solid var(--border);justify-content:space-between;padding:8px 0;display:flex}.balance-row:last-child{border-bottom:none}.page-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.summary-cards{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:20px;display:grid}.summary-card{background:var(--card);border:1px solid var(--border);text-align:center;border-radius:12px;padding:16px}.summary-card .value{margin-top:4px;font-size:24px;font-weight:700}