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(max-width: 640px){.navbar{flex-direction:column;align-items:stretch;gap:.7rem}.nav-links{justify-content:center}.card{padding:1.2rem}.stat-grid{grid-template-columns:1fr 1fr}}.user-badge{background:var(--primary-light);color:var(--primary);padding:.2rem .8rem;border-radius:40px;font-size:.8rem;font-weight:500;margin-left:.8rem}.nav-brand{display:flex;align-items:center;gap:.5rem}@media (max-width: 640px){.user-badge{font-size:.7rem;padding:.1rem .6rem}.nav-brand{flex-wrap:wrap;justify-content:center}}:root{--primary: #2a7de1;--primary-light: #eaf1fd;--income: #22a67e;--expense: #e25c5c;--card-bg: #ffffff;--shadow: 0 8px 20px rgba(0,0,0,.04), 0 2px 6px rgba(0,0,0,.02);--radius: 20px;--transition: .2s ease}body{background:#f4f7fc;color:#1e2a3a}a,button,input,select,textarea{font:inherit}