body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.card {
    border-radius: 15px;
    border: none;
}

.btn {
    border-radius: 8px;
    padding: 12px;
    font-weight: 500;
}

.form-control {
    border-radius: 8px;
    padding: 12px;
}

.form-control:focus {
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
    border-color: #667eea;
}

h1, h2 {
    color: #333;
    font-weight: 600;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,.1);
}

.alert {
    border-radius: 8px;
}