.btn { padding: 10px 20px; border-radius: 8px; border: none; cursor: pointer; background: var(--primary); color: #fff; transition: 0.3s; }
.btn:hover { background: var(--secondary); }
.card { background: var(--bg-card); padding: 20px; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }