.header{justify-content:space-between;padding:10px 20px;background-color:#f8f9fa;box-shadow:0 2px 4px rgba(0,0,0,.1)}.header,.header-left,.header-right{display:flex;align-items:center}.logo{height:40px;margin-right:20px}.nav a{margin:0 15px;text-decoration:none;color:#333;font-weight:700}.currency span{margin:0 10px;font-size:14px}.change-indicator{font-size:12px}.change-indicator.up{color:green}.change-indicator.down{color:red}.login-button{padding:8px 16px;background-color:#007bff;color:white;border-radius:4px;text-decoration:none}@media (max-width:768px){.header{flex-direction:column;align-items:flex-start}.header-right{margin-top:10px}.currency{display:none}.nav{display:flex;flex-direction:column}}